阅读说明：本技术 铝酸钠溶液在线分析系统 (Online analysis system for sodium aluminate solution ) 是由 范艺斌 邹雄伟 王新璋 黄江峰 曹畅 陈展平 于 2020-05-13 设计创作，主要内容包括：本发明公开了一种铝酸钠溶液在线分析系统,包括：缓冲罐,其输入端与输送主管连通,缓冲罐用于容留输入的铝酸钠溶液以使铝酸钠溶液进行初步沉降,缓冲罐还用于调节铝酸钠溶液的输出速度,并对向外输出的铝酸钠溶液进行缓冲以使铝酸钠溶液平稳输出。缓冲罐的输出端连接有自动取样制样装置,自动取样制样装置用于定量吸取铝酸钠溶液,并将吸取的铝酸钠溶液稀释成铝酸钠稀释液后向外输出。自动取样制样装置的输出端连接有在线分析仪,在线分析仪用于对输入的铝酸钠稀释液进行检测分析,以获取铝酸钠稀释液中氧化铝、全碱、苛性碱及碳酸碱的浓度值和苛性比。缓冲罐、自动取样制样装置及在线分析仪分别连接控制装置。(The invention discloses an online analysis system for sodium aluminate solution, which comprises: the buffer tank, its input and carry the main pipe intercommunication, the buffer tank is used for holding the sodium aluminate solution of input so that the sodium aluminate solution carries out preliminary sedimentation, and the buffer tank still is used for adjusting the output speed of sodium aluminate solution to buffer the sodium aluminate solution of outside output so that the steady output of sodium aluminate solution. The output of buffer tank is connected with automatic sampling system appearance device, and automatic sampling system appearance device is used for the ration to absorb sodium aluminate solution to dilute into sodium aluminate diluent with the sodium aluminate solution who absorbs and outwards export. The output end of the automatic sampling and sample preparing device is connected with an online analyzer, and the online analyzer is used for detecting and analyzing the input sodium aluminate diluent so as to obtain concentration values and caustic ratios of alumina, total alkali, caustic alkali and carbonic acid alkali in the sodium aluminate diluent. The buffer tank, the automatic sampling and sample preparing device and the online analyzer are respectively connected with the control device.)

1. An online analysis system for sodium aluminate solution, comprising:

the input end of the buffer tank is communicated with a main conveying pipe (60) for conveying sodium aluminate solution, the buffer tank is used for containing the sodium aluminate solution input by the main conveying pipe (60) so as to enable the sodium aluminate solution to be primarily settled and release pressure, the buffer tank is also used for adjusting the output speed of the sodium aluminate solution and buffering the sodium aluminate solution output outwards so as to enable the sodium aluminate solution to be stably output;

the output end of the buffer tank is connected with an automatic sampling and sample preparing device, and the automatic sampling and sample preparing device is used for quantitatively absorbing the sodium aluminate solution, diluting the absorbed sodium aluminate solution into sodium aluminate diluent suitable for an analysis instrument and then outputting the sodium aluminate diluent;

the output end of the automatic sampling and sample preparing device is connected with an online analyzer, and the online analyzer is used for detecting and analyzing the input sodium aluminate diluent to obtain concentration values and caustic ratios of alumina, total alkali, caustic alkali and carbonic acid alkali in the sodium aluminate diluent;

the buffer tank, the automatic sampling and sample preparing device and the online analyzer are respectively connected with a control device to act under the control of the control device.

2. The on-line analysis system of sodium aluminate solution according to claim 1,

the buffer tank comprises a capacity tank body (11), wherein a first opening (111), a second opening (112) and a third opening (113) are formed in the capacity tank body (11), the first opening (111) and the second opening (112) are respectively formed in the peripheral side wall of the capacity tank body (11), and the third opening (113) is formed in the bottom of the capacity tank body (11);

the flow regulating device further comprises a flow regulating component (12) which is arranged on the capacity tank body (11) and is adjustable with the flow of the internal channel of the third opening (113), one end of the flow regulating component (12) is movably fixed on the capacity tank body (11), and the outer peripheral surface of the other end which is arranged oppositely is matched with the internal shape and size of the third opening (113).

3. The online analysis system of sodium aluminate solution according to claim 2, characterized in that,

the first opening (111) is a liquid inlet, the second opening (112) is a liquid outlet, and the third opening (113) is a liquid outlet; the flow area of the third opening (113) is controlled by the flow regulating component (12), so that the liquid level height of the solution in the volume tank body (11) is regulated, and the flow balance of the second opening (112) is ensured; or

The third opening (113) is a liquid inlet, the first opening (111) is a liquid outlet, and the second opening (112) is a liquid outlet.

4. The online analysis system of sodium aluminate solution according to claim 3, characterized in that,

the flow regulating component (12) comprises a plug (121) inserted into or sheltered from the third opening (113), the plug (121) is connected with a driving rod (122) used for driving the plug to move up and down, the upper end of the driving rod (122) is in threaded connection with the cover plate (116), so that the plug (121) is driven to move up and down when the driving rod (122) is rotated, and then a gap between the plug (121) and the third opening (113) is regulated, and further the flow of the third opening (113) is regulated.

5. The on-line analysis system of sodium aluminate solution according to claim 1, characterized in that the automatic sampling and sample-preparing device comprises:

sample groove (20), dilute pond (30), driver (50), sample groove (20) with dilute pond (30) spaced setting still includes sampler (40) and controller, the controller with driver (50) are connected, sampler (40) set up on driver (50), through the controller is in sample groove (20) with switchable operation between dilute pond (30).

6. The online analysis system of sodium aluminate solution according to claim 5, characterized in that,

the sampler (40) comprises a sampling needle (41) which is inserted into the sampling groove (20) to absorb sample liquid to be processed, the upper end of the sampling needle (41) is connected with a containing body (42) with a containing cavity (420), and the containing cavity (420) is communicated with the sampling needle (41) to contain the sample liquid to be processed absorbed by the sampling needle (41);

the accommodating cavity (420) is also communicated with a pressure device (43), and the pressure device (43) is connected with the controller; so as to suck the sample liquid to be processed into the containing cavity (420) by the sampling needle (41) and contain the sample liquid, or

So as to push the sample liquid to be processed contained in the containing cavity (420) into the dilution tank through the sampling needle (41);

the containing body (42) is connected with a sample liquid monitoring piece (44), the sample liquid monitoring piece (44) is connected with the controller, so that when the amount of the sample liquid to be processed in the containing cavity (420) reaches a preset amount, the controller controls the pressure device (43) to maintain pressure, and the sampling needle (41) stops sucking the sample liquid to be processed.

7. The on-line analysis system of sodium aluminate solution according to claim 1,

the online analyzer comprises a first detection pool (70) and a second detection pool (80), wherein the first detection pool (70) and the second detection pool (80) are respectively communicated with the output end of the automatic sampling and sample preparing device, so that sodium aluminate diluent respectively enters the first detection pool (70) and the second detection pool (80);

the first detection cell (70) is also communicated with a first reagent supply device (110), the first reagent supply device (110) is connected with the control device, and the first reagent supply device (110) is used for adding a first group of reaction reagents into the first detection cell (70) so as to enable the first detection cell (70) to react to form a total reaction solution for the control device to obtain an alumina concentration value;

the second detection pool (80) is also communicated with a second reagent supply device, the second reagent supply device is connected with the control device, and the second reagent supply device is used for adding a second group of reaction reagents into the second detection pool (80) so as to enable the second detection pool (80) to react to form a total reaction liquid for the control device to obtain intermediate variables of total alkali and alkali carbonate;

the first detection pool (70) and the second detection pool (80) are also respectively connected with a titration end point detection device (140), the titration end point detection device (140) is connected with the control device, the titration end point detection device (140) is used for detecting the color change of the reaction solution in the first detection pool (70) or the second detection pool (80) and sending a reaction completion signal to the control device when the color is a set color, and the control device correspondingly controls the first reagent supply device (110) or the second reagent supply device to act according to the received reaction completion signal so as to stop the continuous addition of the reaction reagent; alternatively, the first and second electrodes may be,

the titration end point detection device (140) is used for detecting the voltage change or the current change of the reaction solution in the first detection cell (70) or the second detection cell (80), and sending a reaction completion signal to the control device when the voltage is a set voltage or the current is a set current, and the control device correspondingly controls the first reagent supply device (110) or the second reagent supply device to act according to the received reaction completion signal so as to stop the continuous addition of the reaction reagent.

8. The online analysis system of sodium aluminate solution according to claim 7, characterized in that,

the first detection pool (70) and the second detection pool (80) are identical in structure and respectively comprise a hollow cylindrical detection pool body (91) with two closed ends, and a diluent connecting pipe (92) and a plurality of reagent connecting pipes (93) which are inserted into an inner cavity of the detection pool body (91) are arranged on the outer side wall of the detection pool body (91);

the input end of the diluent connecting pipe (92) is communicated with the output end of the automatic sampling and sample preparing device, so that the sodium aluminate diluent enters the detection pool body (91);

the input end of each reagent connecting pipe (93) is respectively communicated with the first reagent supply device (110) so that a first group of reaction reagents can be respectively added into the detection cell body (91) of the first detection cell (70), or the input end of each reagent connecting pipe (93) is respectively communicated with the second reagent supply device so that a second group of reaction reagents can be respectively added into the detection cell body (91) of the second detection cell (80).

9. The online analysis system of sodium aluminate solution according to claim 8, characterized in that,

the diluent connecting pipe (92), the reagent connecting pipe (93) and the air connecting pipe (94) are respectively perpendicular to the outer side wall of the detection cell body (91) and inserted into the middle of the inner cavity of the detection cell body (91), and the diluent connecting pipe (92) and one of the reagent connecting pipes (93) are arranged close to the bottom of the detection cell body (91) and extend into the sodium aluminate diluent in the detection cell body (91);

first detection pond (70) with second detection pond (80) still include agitator (150) respectively, agitator (150) connect in the top of detection pond body (91), just agitator (150) with controlling means links to each other, the stirring end of agitator (150) passes stretch into in the sodium aluminate diluent behind the top of detection pond body (91), in order to be used for with reaction solution stirring in the detection pond body (91).

10. The online analysis system of sodium aluminate solution according to claim 8, characterized in that,

the titration end point detection device (140) comprises a light source (141) and a photosensitive sensor (142), the light source (141) and the photosensitive sensor (142) are respectively arranged on two opposite sides of the detection pool body (91), the setting height of the light source (141) and the photosensitive sensor (142) is lower than that of the sodium aluminate diluent in the detection pool body (91), and the photosensitive sensor (142) is connected with the control device; or

The titration end point detection device (140) comprises an oxidation-reduction electrode, the oxidation-reduction electrode is connected to the top of the detection pool body (91) and is connected with the control device, and the lower end of the oxidation-reduction electrode penetrates through the top of the detection pool body (91) and then is vertically inserted into the sodium aluminate diluent; or

The titration end point detection device (140) comprises a pH electrode, the pH electrode is connected to the top of the detection cell body (91) and connected with the control device, and the lower end of the pH electrode penetrates through the top of the detection cell body (91) and then is vertically inserted into the sodium aluminate diluent.

Technical Field

The invention relates to the field of alumina production and preparation systems, in particular to an online analysis system for a sodium aluminate solution.

Background

At present, in the production process of alumina, the analysis of sodium aluminate solution is mainly completed manually, and the general flow of the analysis is sampling, diluting and analyzing in sequence, that is, an experimenter firstly takes the sodium aluminate solution to be analyzed from a sampling point, then transfers the sodium aluminate solution to a chemical analysis room, and then the experimenter dilutes the sodium aluminate solution in the chemical analysis room, and finally analyzes and detects the diluted sodium aluminate solution, and calculates the concentration values and caustic ratio of the parameter substances such as alumina, total alkali, caustic alkali, carbonic acid alkali and the like in the sodium aluminate solution.

When the sodium aluminate solution is manually sampled to the sampling point and then is fed to the analysis chamber, on one hand, the randomness of manual sampling is very high, so that the fluctuation range of subsequent analysis results is large and unstable; on the other hand, the sample is rapidly reduced in temperature in the transferring process, the solute is separated out due to the large reduction of the solubility of the solute in the solution, the quality of the sample is affected, the analysis result of the sample is further affected, the pipette blockage is easily caused, the continuation of the experiment is affected, the quality of the sample of the solution is easily changed in the transferring process, the sample in the experimental analysis is far different from the real condition of the sample at the sampling point, and the accuracy of the analysis result is further affected. When manually using a pipette to remove a solution for dilution, the amount of the solution manually removed each time is unstable and the position of the pipette inserted into the solution is also unstable, thereby causing the result of sample analysis to be unstable. In the whole operation process, the work of an analyst is complicated, and the analysis efficiency is very low.

Disclosure of Invention

The invention provides an online analysis system for a sodium aluminate solution, which aims to solve the technical problems of unstable analysis result, low accuracy of analysis result and low detection and analysis efficiency in manual sampling, detection and analysis.

The technical scheme adopted by the invention is as follows:

an online analysis system for sodium aluminate solution, comprising: the input end of the buffer tank is communicated with the main conveying pipe for conveying the sodium aluminate solution, the buffer tank is used for containing the sodium aluminate solution input by the main conveying pipe so as to carry out preliminary precipitation and filtration on the sodium aluminate solution, and the buffer tank is also used for adjusting the output speed of the sodium aluminate solution and buffering the sodium aluminate solution output outwards so as to stably output the sodium aluminate solution; the output end of the buffer tank is connected with an automatic sampling and sample preparing device, and the automatic sampling and sample preparing device is used for quantitatively absorbing the sodium aluminate solution, diluting the absorbed sodium aluminate solution into sodium aluminate diluent suitable for an analysis instrument and then outputting the sodium aluminate diluent; the output end of the automatic sampling and sample preparing device is connected with an online analyzer, and the online analyzer is used for detecting and analyzing the input sodium aluminate diluent to obtain concentration values and caustic ratios of alumina, total alkali, caustic alkali and carbonic acid alkali in the sodium aluminate diluent; the buffer tank, the automatic sampling and sample preparing device and the on-line analyzer are respectively connected with the control device to act under the control of the control device.

Furthermore, the buffer tank comprises a capacity tank body, a first opening, a second opening and a third opening are formed in the capacity tank body, the first opening and the second opening are respectively formed in the peripheral side wall of the capacity tank body, and the third opening is formed in the bottom of the capacity tank body; the adjustable volume tank is characterized by further comprising an adjusting component which is arranged on the volume tank body and is adjustable with the flow of the internal channel of the third opening, one end of the adjusting component is movably fixed on the volume tank body, and the outer peripheral surface of the other end, which is arranged oppositely, is matched with the inner shape and size of the third opening.

Further, the first opening is a liquid inlet, the second opening is a liquid outlet, and the third opening is a liquid outlet; the flow area of the third opening is controlled through the adjusting component, so that the liquid level height of the solution in the volume tank body is adjusted, and the flow balance of the second opening is ensured; or the third opening is a liquid inlet, the first opening is a liquid outlet, and the second opening is a liquid outlet.

Furthermore, the flow regulating component comprises a plug which is inserted into or shelters from the third opening, the plug is connected with a driving rod which is used for driving the plug to move up and down, and the upper end of the driving rod is in threaded connection with the cover plate so as to drive the plug to move up and down when the driving rod is rotated to regulate the gap between the plug and the third opening and further regulate the flow of the third opening.

Further, the automatic sampling and sample preparing device comprises: sample groove, dilution pond, driver, sample groove and the setting of diluting the pond interval still include sampler and controller, and the controller is connected with the driver, and the sampler setting is on the driver, through the controller at sample groove and dilute the changeable operation between the pond.

Furthermore, the sampler comprises a sampling needle which is inserted into the sampling groove to absorb the sample liquid to be processed, the upper end of the sampling needle is connected with a containing body with a containing cavity, and the containing cavity is communicated with the sampling needle to contain the sample liquid to be processed absorbed by the sampling needle; the accommodating cavity is also communicated with a pressure device, and the pressure device is connected with a controller; the controller controls the pressure device to act to generate negative pressure so as to suck the sample liquid to be processed into the containing cavity by the sampling needle and contain the sample liquid, or the controller controls the pressure device to act to generate positive pressure so as to push the sample liquid to be processed contained in the containing cavity into the dilution tank through the sampling needle; the containing body is connected with a sample liquid monitoring piece, and the sample liquid monitoring piece is connected with the controller, so that when the amount of the sample liquid to be processed in the containing cavity reaches a preset amount, the controller controls the pressure device to maintain pressure, and the sampling needle stops sucking the sample liquid to be processed.

Further, the online analyzer comprises a first detection pool and a second detection pool, wherein the first detection pool and the second detection pool are respectively communicated with the output end of the automatic sampling and sample preparing device, so that the sodium aluminate diluent respectively enters the first detection pool and the second detection pool; the first detection pool is also communicated with a first reagent supply device, the first reagent supply device is connected with the control device, and the first reagent supply device is used for adding a first group of reaction reagents into the first detection pool so as to enable the first detection pool to react to form a total reaction liquid for the control device to obtain the concentration value of the alumina; the second detection pool is also communicated with a second reagent supply device, the second reagent supply device is connected with the control device, and the second reagent supply device is used for adding a second group of reaction reagents into the second detection pool so as to enable the second detection pool to react to form a full reaction liquid for the control device to obtain intermediate variables of full alkali and carbonate; the first detection pool and the second detection pool are also respectively connected with a titration end point detection device, the titration end point detection device is connected with the control device, the titration end point detection device is used for detecting the color change of the reaction solution in the first detection pool or the second detection pool and sending a reaction completion signal to the control device when the color is a set color, and the control device correspondingly controls the first reagent supply device or the second reagent supply device to act according to the received reaction completion signal so as to stop the continuous addition of the reaction reagent; or the titration end point detection device is used for detecting the voltage change or the current change of the reaction solution in the first detection cell or the second detection cell and sending a reaction completion signal to the control device when the voltage is a set voltage or the current is a set current, and the control device correspondingly controls the first reagent supply device or the second reagent supply device to act according to the received reaction completion signal so as to stop the continuous addition of the reaction reagent.

Furthermore, the first detection pool and the second detection pool have the same structure, the first detection pool and the second detection pool respectively comprise a hollow cylindrical detection pool body with two closed ends, and a diluent connecting pipe and a plurality of reagent connecting pipes inserted into the inner cavity of the detection pool body are arranged on the outer side wall of the detection pool body; the input end of the diluent connecting pipe is communicated with the output end of the automatic sampling and sample preparing device so that the sodium aluminate diluent enters the detection pool body; the input end of each reagent connecting pipe is respectively communicated with the first reagent supply device so that the first group of reaction reagents are respectively added into the detection pool body of the first detection pool, or the input end of each reagent connecting pipe is respectively communicated with the second reagent supply device so that the second group of reaction reagents are respectively added into the detection pool body of the second detection pool.

Furthermore, the diluent connecting pipe, the reagent connecting pipe and the air connecting pipe are respectively and vertically inserted into the middle part of the inner cavity of the detection pool body along the outer side wall of the detection pool body, and the diluent connecting pipe and one of the reagent connecting pipes are arranged close to the bottom of the detection pool body and extend into the sodium aluminate diluent in the detection pool body; the first detection pool and the second detection pool respectively comprise a stirrer, the stirrer is connected to the top end of the detection pool body and connected with the control device, and the stirring end of the stirrer penetrates through the top end of the detection pool body and then extends into the sodium aluminate diluent so as to be used for uniformly stirring the reaction solution in the detection pool body.

Furthermore, the titration end point detection device comprises a light source and a photosensitive sensor, the light source and the photosensitive sensor are respectively arranged on two opposite sides of the detection pool body, the setting height of the light source and the photosensitive sensor is lower than that of the sodium aluminate diluent in the detection pool body, and the photosensitive sensor is connected with the control device; or the titration end point detection device comprises an oxidation-reduction electrode, the oxidation-reduction electrode is connected to the top of the detection pool body and is connected with the control device, and the lower end of the oxidation-reduction electrode penetrates through the top of the detection pool body and then is vertically inserted into the sodium aluminate diluent; or the titration end point detection device comprises a pH electrode, the pH electrode is connected to the top of the detection cell body and is connected with the control device, and the lower end of the pH electrode penetrates through the top of the detection cell body and then is vertically inserted into the sodium aluminate diluent.

The invention has the following beneficial effects:

in the online analysis system for the sodium aluminate solution, the buffer tank has the function of containing the sodium aluminate solution, so that the entering solution can be subjected to preliminary sedimentation filtration and flow rate buffering and stabilization, the content of solid particles in the sodium aluminate diluent subsequently entering an analysis instrument is further reduced, the risk of pipeline blockage inside the analysis instrument is reduced, and meanwhile, the buffer tank also has the function of buffering the output sodium aluminate solution, so that the flow rate of the solution subsequently entering the analysis instrument is stable and balanced, and the sampling analysis of the analysis instrument is facilitated; in the online analysis system for the sodium aluminate solution, the processes of sampling, diluting and preparing the sodium aluminate solution and online detection and analysis are all automatically carried out, so that the whole detection and analysis efficiency is improved, and the whole process is not manually participated, so that the detection and analysis result is stable, the fluctuation range is small, the accuracy of the detection and analysis result is high, and the labor intensity of detection and analysis personnel is very small.

In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a system block diagram of an online analysis system for sodium aluminate solution in accordance with a preferred embodiment of the present invention;

FIG. 2 is a schematic front view of the buffer tank of FIG. 1;

FIG. 3 is a schematic diagram of the automatic sampling and sample-preparing apparatus of FIG. 1;

FIG. 4 is a schematic diagram of a first embodiment of the sampler of FIG. 3;

FIG. 5 is a schematic diagram of a second embodiment of the sampler of FIG. 3;

FIG. 6 is a schematic diagram of a third embodiment of the sampler of FIG. 3;

FIG. 7 is a schematic diagram of the on-line analyzer of FIG. 1;

FIG. 8 is a schematic front view of the first embodiment of the first detection cell of FIG. 7;

FIG. 9 is a schematic left side view of the structure of FIG. 8;

FIG. 10 is a schematic front view of the first detection cell of FIG. 7 according to a second embodiment.

Description of the figures

11. A capacity tank body; 111. a first opening; 112. a second opening; 113. a third opening; 114. a fourth opening; 115. a tank body; 116. a cover plate; 12. a flow regulating member; 121. a plug; 122. a drive rod; 20. a sampling groove; 21. a sampling tank body; 22. a sampling tube; 23. a drain pipe; 30. a dilution tank; 40. a sampler; 41. a sampling needle; 42. an accommodating body; 420. an accommodating cavity; 43. a pressure device; 44. a sample liquid monitoring member; 441. a detection electrode; 442. a first conductive line; 443. a second conductive line; 444. a liquid level sensor; 445. a transparent tube; 45. connecting a joint; 46. a seal member; 50. a driver; 60. a main conveying pipe; 70. a first detection cell; 80. a second detection cell; 91. a detection cell body; 92. a diluent connecting pipe; 93. a reagent adapter; 94. an air connection pipe; 95. a reaction liquid connection pipe; 110. a first reagent supply device; 140. a titration end point detection device; 141. a light source; 142. a photosensitive sensor; 150. a stirrer; 151. a stirring motor; 152. a stirring rod.

Detailed Description

The embodiments of the invention will be described in detail below with reference to the accompanying drawings, but the invention can be embodied in many different forms, which are defined and covered by the following description.

Referring to fig. 1, a preferred embodiment of the present invention provides an online analysis system for sodium aluminate solution, comprising: the buffer tank, the input of buffer tank is responsible for 60 intercommunications with the transport that is used for carrying sodium aluminate solution, and the buffer tank is used for the sodium aluminate solution of holding by carrying the person in charge 60 input so that sodium aluminate solution carries out preliminary sedimentation and filters, and the buffer tank still is used for adjusting the output speed of sodium aluminate solution to buffer the sodium aluminate solution to outside output so that the steady output of sodium aluminate solution. The output of buffer tank is connected with automatic sampling system appearance device, and automatic sampling system appearance device is used for the ration to absorb sodium aluminate solution to dilute into suitable analytical instrument's sodium aluminate diluent with the sodium aluminate solution who absorbs and outwards export. The output end of the automatic sampling and sample preparing device is connected with an online analyzer, and the online analyzer is used for detecting and analyzing the input sodium aluminate diluent so as to obtain concentration values and caustic ratios of alumina, total alkali, caustic alkali and carbonic acid alkali in the sodium aluminate diluent. The buffer tank, the automatic sampling and sample preparing device and the on-line analyzer are respectively connected with a control device (not shown) to act under the control of the control device.

When the online analysis system for the sodium aluminate solution works, the sodium aluminate solution firstly enters the buffer tank from the main conveying pipe 60, is primarily precipitated and filtered by the buffer tank and then is output to the automatic sampling and sample preparing device, and the buffer tank can also adjust the speed of the output sodium aluminate solution and buffer the output sodium aluminate solution so as to stably output the sodium aluminate solution; after the sodium aluminate solution enters the automatic sampling and sample-making device, the automatic sampling and sample-making device absorbs a certain amount of the sodium aluminate solution, dilutes the absorbed sodium aluminate solution to prepare a sodium aluminate diluent suitable for an analysis instrument and outputs the sodium aluminate diluent outwards; and the output sodium aluminate diluent enters an online analyzer, and after the online analyzer detects and analyzes the input sodium aluminate diluent, concentration values and caustic ratios of alumina, total alkali, caustic alkali and carbonic acid in the sodium aluminate diluent are obtained, so that online detection and analysis of the sodium aluminate solution are completed.

In the online analysis system for the sodium aluminate solution, the buffer tank has the function of containing the sodium aluminate solution, so that the entering solution can be subjected to preliminary sedimentation and flow rate buffering and stabilization, the content of solid particles in the sodium aluminate diluent subsequently entering an analysis instrument is further reduced, the risk of pipeline blockage inside the analysis instrument is reduced, and meanwhile, the buffer tank also has the function of buffering the output sodium aluminate solution, so that the flow rate of the solution subsequently entering the analysis instrument is stable and balanced, and the sampling analysis of the analysis instrument is facilitated; in the online analysis system for the sodium aluminate solution, the processes of sampling, diluting and preparing the sodium aluminate solution and online detection and analysis are all automatically carried out, so that the whole detection and analysis efficiency is improved, and the whole process is not manually participated, so that the detection and analysis result is stable, the fluctuation range is small, the accuracy of the detection and analysis result is high, and the labor intensity of detection and analysis personnel is very small.

Referring to fig. 2, a preferred embodiment of the present invention provides a surge tank for industrial production, including: the volume tank body 11 is provided with a first opening 111, a second opening 112 and a third opening 113, the first opening 111 and the second opening 112 are respectively arranged on the peripheral side wall of the volume tank body 11, and the third opening 113 is arranged at the bottom of the volume tank body 11 along the vertical direction of the volume tank body 11. The flow regulating device further comprises a flow regulating component 12 which is arranged on the capacity tank body 11 and is adjustable with the flow of the internal channel of the third opening 113, one end of the flow regulating component 12 is movably fixed on the capacity tank body 11, and the outer peripheral surface of the other end which is arranged oppositely is matched with the internal shape and size of the third opening 113.

According to the buffer tank for industrial production provided by the embodiment of the invention, through the end side face of the flow regulating member 12 matched with the internal shape and size of the third opening 113, when the flow regulating member 12 is driven to move relative to the capacity tank body 11, the control of the flow area of the third opening 113 is realized, so that the regulation of the internal capacity of the capacity tank body 11 is realized; because the solution is temporarily stored in the volume tank body 11 and then flows out through the third opening 113 and/or the second opening 112, the pressure carried by the solution before entering the volume tank body 11 is well relieved, the spray phenomenon caused by unstable flow is avoided, the solution with constant flow can be provided, and the continuous operation working condition is facilitated; because the solution is temporarily stored in the capacity tank body 11, solid particles contained in the solution automatically settle under the action of gravity in the temporary storage process, and the method is particularly suitable for high-solid solution (such as high-temperature, strong alkali and high-solid sodium aluminate solution); as the whole buffer tank does not need to adopt gaskets, sealing rings and other parts which are easy to age and corrode, the problems of leakage or blockage caused by corrosion and unsteady flow are well solved.

In some embodiments of the present invention, the first opening 111 and the second opening 112 are spaced along the plumb direction, so that a certain drop height is formed inside the volume tank body 11, and precise control of the flow rate is better achieved. Or the first opening 111 and the second opening 112 are located on the same side wall surface of the capacity can body 11. Alternatively, the first opening 111 and the second opening 112 are provided on two adjacent side wall surfaces of the capacity tank body 11.

In a preferred embodiment of the present invention, the first opening 111 is a liquid inlet, the second opening 112 is a liquid outlet, and the third opening 113 is a liquid outlet, so that after entering from the first opening 111, the solution with high temperature, high pressure and extremely unstable flow rate is temporarily stored in the volume tank body 11, and then flows out from the second opening 112, and the redundant solution is emptied through the third opening 113; the flow rate of the solution in the volume tank body 11 can be adjusted to be constant by controlling the flow area of the third port 113 by the flow rate adjusting member 12. Specifically, first opening 111 communicates with the main conveyer pipe of carrying the solution to be analyzed to supply the solution to be analyzed to get into capacity jar body 11, capacity jar body 11 is used for the solution to be analyzed who holds the entering so that the solution to be analyzed carries out the nature and subsides, and makes the solution to be analyzed who gets into reach steady flow rate after buffering, and second opening 112 links to each other with analytical instrument, so that the solution to be analyzed after preliminary filtration and the flow rate is steady gets into analytical instrument and analyzes. The bottom of the volume tank body 11 is provided with a third opening 113, the third opening 113 is communicated with a return pipe for recovering the solution to be analyzed, a flow regulating member 12 connected with the volume tank body 11 is arranged in the third opening 113, and the flow regulating member 12 is used for regulating the flow of the solution to be analyzed discharged from the third opening 113, so as to indirectly regulate the flow of the solution to be analyzed flowing out of the second opening 112.

In another preferred embodiment of the present invention, the third opening 113 is a liquid inlet, the first opening 111 is a liquid outlet, and the second opening 112 is a liquid outlet, so that after the solution with high temperature, high pressure and extremely unstable flow rate enters from the third opening 113, the flow rate entering the volume tank body 11 is controlled by adjusting the flow area between the flow rate adjusting member 12 and the third opening 113, thereby ensuring that the flow rate of the second opening 112 is constant. Specifically, the third opening 113 is communicated with a main delivery pipe for delivering a solution to be analyzed, so that the solution to be analyzed enters the capacity tank body 11, a flow regulating member 12 connected with the capacity tank body 11 is arranged in the third opening 113, the flow regulating member 12 is used for regulating the flow of the solution to be analyzed flowing into the third opening 113, so as to indirectly regulate the flow of the solution to be analyzed flowing out of the second opening 112, and the capacity tank body 11 is used for containing the entering solution to be analyzed, so that the solution to be analyzed is naturally settled, and the entering solution to be analyzed is buffered, and then a stable flow rate is achieved. The first opening 111 communicates with a return pipe for recovering the solution to be analyzed.

When the buffer tank works, a solution to be analyzed in the main conveying pipe, taking a sodium aluminate solution as an example, firstly enters the capacity tank body 11 from the first opening 111, and solid particles such as slag and educt in the solution settle downwards under the action of gravity in the flowing process of the solution in the capacity tank body 11 under the holding action of the capacity tank body 11 on the solution, so that the content of the solid particles entering the second opening 112 is reduced; meanwhile, the flow rate flowing out of the second opening 112 is made constant by the regulation of the flow area of the third opening 113 by the flow rate regulation member 12. After the solution is buffered, settled and stabilized, the solution flows out through the second opening 112 and then enters an analysis instrument for analysis and treatment. Or, taking the sodium aluminate solution as an example, the sodium aluminate solution in the main delivery pipe firstly enters the capacity tank body 11 from the third opening 113, and in the process that the solution flows in the capacity tank body 11 under the holding effect of the capacity tank body 11 on the solution, solid particles such as slag and precipitate in the solution are settled downwards under the action of gravity, so that the content of the solid particles entering the second opening 112 is reduced; meanwhile, the flow rate flowing out of the second opening 112 is made constant by the regulation of the flow area of the third opening 113 by the flow rate regulation member 12. After the solution is buffered, settled and stabilized, the solution flows out through the second opening 112 and then enters an analysis instrument for analysis and treatment.

In the buffer tank, the capacity tank body 11 has the function of containing the solution, so that the entering solution can be subjected to preliminary sedimentation filtration and flow rate buffering and stabilization, the content of solid particles in the solution entering an analysis instrument is further reduced, the risk of pipeline blockage inside the analysis instrument is reduced, and meanwhile, the buffer tank has a buffering function on the solution, so that the flow rate of the solution entering the analysis instrument is stable and balanced, and the sampling analysis of the analysis instrument is facilitated.

Alternatively, as shown in fig. 2, the capacity tank body 11 includes a hollow cylindrical tank body 115, an upper opening end of the tank body 115 is a fifth opening, and a cover plate 116 for opening or closing the tank body 115 is provided at the fifth opening. The flow rate adjusting member 12 is connected to the cover plate 116, and the bottom end of the flow rate adjusting member 12 is used for being inserted into the third opening 113 to adjust the flow rate of the third opening 113, and the upper opening end of the tank 115 is also used as a service hole. In the invention, because the volume tank body 11 comprises the tank body 115 and the cover plate which are detachably designed, and the flow regulating member 12 is connected to the cover plate, and the lower end of the flow regulating member 12 is inserted into/shields the third opening 113, the cover plate can be opened to clean solid particles attached to the tank body 115 or the flow regulating member 12, thereby greatly reducing the risk of pipeline blockage and simultaneously reducing the pipeline maintenance work; on the other hand, when the flow regulating member 12 is out of order, the volume tank body 11 is of a detachable structure, so that the flow regulating member 12 can be maintained independently without closing the whole pipeline or replacing the diversion transfer tank as a whole, the cost is reduced, and the working efficiency is not affected.

In some embodiments of the invention, as shown in FIG. 2, the floor of the tank 115 is a tapered plate; the third opening 113 is located in the center of the conical plate, so that the solution to be analyzed in the tank 115 can be conveniently discharged from the third opening 113, and the solid particles can be conveniently and smoothly discharged from the third opening 113, thereby reducing the retention of the solid particles between the plug 121 and the third opening 113. The lower end surface of the plug 121 is a conical surface matched with the conical plate, and the plug 121 and the third opening 113 are matched through a conical surface, so that the gap between the plug 121 and the third opening 113 can be conveniently adjusted, and the flow rate of the third opening 113 can be controlled. In the actual use process, the plug 121 does not need to completely block the third opening 113, and is in a normally open state, and only the flow rate of the third opening 113 needs to be ensured to be smaller than that of the first opening 111, so that the solution in the tank body 115 can flow out from the second opening 112, and therefore, the plug 121 and the third opening 113 cannot be blocked by solid particles in the solution to be analyzed due to small gaps.

In other embodiments of the present invention, not shown in the drawings, the bottom plate of the tank 115 is a plane, the second opening 112 is located in the middle of the bottom plate, a drain pipe for discharging the solution to be analyzed is connected to the second opening 112, a water inlet end of the drain pipe is a tapered conical pipe, and the bottom plate of the tank 115 is a plane, so as to facilitate precipitation and deposition of solid particles in the solution to be analyzed, further reduce the content of the solid particles in the pipeline, reduce the risk of pipeline blockage, and facilitate the solid particles to be cleaned out of the tank 115. The lower end surface of the plug 121 is a conical surface matched with the inner conical surface of the conical tube. The plug 121 and the drain pipe of the third opening 113 are matched through a conical surface, so that the gap between the plug 121 and the water inlet end of the drain pipe can be conveniently adjusted, and the flow of the third opening 113 can be controlled. In the actual use process, the plug 121 does not need to completely block the third opening 113, and is in a normally open state, and only the flow rate of the third opening 113 needs to be ensured to be smaller than that of the first opening 111, so that the solution in the tank body 115 can flow out from the second opening 112, and therefore, the plug 121 and the third opening 113 cannot be blocked by solid particles in the solution to be analyzed due to small gaps.

In some embodiments of the present invention, a fourth opening 114 is further disposed on a side wall of the tank 115, the fourth opening 114 is located above the second opening 112 and is communicated with the return pipe, and the fourth opening 114 is used for allowing the solution to be analyzed in the tank 115 to overflow outwards and then return to the return pipe. In actual use, when the flow rate of the second opening 112 reaches the upper limit, the excess solution flows into the return pipe through the fourth opening 114 above the second opening 112, and the flow rate of the second opening is constant.

Alternatively, as shown in fig. 2, the flow rate adjusting member 12 includes a plug 121 for being inserted into/blocking the third opening 113, the plug 121 is connected with a driving rod 122 for driving the plug 121 to move up and down, and an upper end of the driving rod 122 is in threaded connection with the cover plate 116, so that when the driving rod 122 is rotated, the plug 121 is driven to move up and down to adjust a gap between the plug 121 and the third opening 113, thereby adjusting the flow rate of the third opening 113. When the flow regulating member 12 of the present invention is used to regulate the flow of the second opening 112, only the driving rod 122 needs to be rotated to make the driving rod 122 drive the plug 121 to move up and down, so as to regulate the gap between the plug 121 and the third opening 113 to regulate the flow of the third opening 113, thereby achieving the purpose of indirectly regulating the flow of the second opening 112, and the flow regulating member 12 has a simple structure, is simple to regulate and operate, is easy to implement, and because the regulating screw thread is located on the cover plate 116, it does not contact with the solution in the tank body 115, thereby completely avoiding the regulating screw thread from being corroded or jammed by solid particles, and meanwhile, when the flow regulating member 12 is maintained or replaced, there is no need to saw off the pipeline connected with the capacity tank body 11.

Alternatively, as shown in fig. 2, the flow rate adjustment member 12 further includes a guide cylinder for guiding the driving rod 122, the guide cylinder is vertically connected to the upper surface or the lower surface of the cover plate 116, and an internal thread is provided in the guide cylinder to be threadedly connected with the driving rod 122.

Alternatively, the capacity tank body 11 is a high-temperature-resistant corrosion-resistant structure, and the flow rate regulation member 12 is a high-temperature-resistant corrosion-resistant member; or the inner surface of the capacity tank body 11 is adhered with a high-temperature-resistant corrosion-resistant layer, and the surface of the flow regulating component 12 is assisted with the high-temperature-resistant corrosion-resistant layer. Specifically, the capacity tank body 11 and the flow regulating member 12 are both made of stainless steel materials, the stainless steel can resist the high temperature and the corrosivity of the solution to be analyzed, and the buffer tank does not contain rubber and other parts which are easy to corrode and age, so that the problem of leakage or blockage caused by corrosion is solved.

Preferably, the first opening 111 and the second opening 112 are disposed opposite to each other, so as to reduce influence of the first opening 111 on the solution flowing out of the second opening 112 as much as possible, so that the flow rate of the solution flowing out of the second opening 112 is stable and balanced, and the inflow cross-sectional area of the first opening 111 is larger than the outflow cross-sectional area of the second opening 112, so that the second opening 112 is filled with the solution to be analyzed in the whole working process, so as to further stabilize and balance the flow rate of the solution to be analyzed.

Alternatively, as shown in fig. 3, a preferred embodiment of the present invention provides an automatic sampling and sample preparation apparatus, comprising: sampling groove 20, dilution pond 30, driver 50, the setting at sampling groove 20 and dilution pond 30 interval still includes sampler 40 and controller, and the controller is connected with driver 50, and sampler 40 sets up on driver 50, through the changeable operation of controller between sampling groove 20 and dilution pond 30.

When the automatic sampling and sample preparing device works, a sample liquid to be processed firstly enters the sampling groove 20 through the conveying main pipe, then the controller controls the driver 50 to act, the driver 50 drives the sampler 40 to move so as to be vertically inserted into the sampling groove 20, then the controller controls the sampler 40 to start, the sampler 40 sucks a preset amount of the sample liquid to be processed, then the controller controls the driver 50 to act again, the driver 50 drives the sampler 40 to move to the upper part of the diluting pool 30, then the controller controls the sampler 40 to act again, and the sampler 40 adds the sucked preset amount of the sample liquid to be processed into the diluting pool 30, so that the sample liquid to be analyzed suitable for an analysis instrument is formed in the diluting pool 30.

In the invention, the sample solution to be treated is a sodium aluminate solution, because the sodium aluminate solution has the characteristics of high temperature and easy precipitation, if the sodium aluminate solution does not flow in real time in the sampling process, the temperature is rapidly reduced in the sampling process, the solubility of solute in the solution is greatly reduced to cause the precipitation of solute, and finally the quality of the taken sodium aluminate solution is reduced and the sampler 40 is easy to block, so that in the automatic sampling and sample preparing device, the sampling tank 20 is not only used for containing the sodium aluminate solution, but also more importantly, the sodium aluminate solution flows in the sampling tank 20 in real time to solve the existing technical problem, ensure the quality and stability of the taken sodium aluminate solution and effectively prevent the sampler 40 from blocking; the whole sampling, diluting and sample preparing process of the automatic sampling and sample preparing device is carried out automatically, the sampling and sample preparing efficiency is improved, the sample liquid with the same height in the sampling groove 20 is sucked every time, and the amount of the sampled liquid is stable every time, so the sampling quality of the sample liquid is high, the analysis result of the sample liquid is stable, the fluctuation is small, and the influence of human factors on the analysis result of the sample liquid is greatly reduced.

Optionally, the automatic sampling and sample preparation device of the present invention comprises: and the sampling tank 20 is used for holding the sample liquid to be treated and enabling the sample liquid to be treated to flow in real time in the sampling tank 20, and the sampling tank 20 is communicated with a conveying main pipe used for conveying the sample liquid to be treated. The device further comprises a diluting tank 30, wherein the diluting tank 30 is used for containing a diluting solution, and the sample solution to be processed is diluted through the diluting solution in the diluting tank 30, so that the sample solution to be analyzed applicable to an analysis instrument is formed. The automatic sampling and sample preparing device further comprises a sampler 40 for sucking the sample liquid to be processed, a driver 50 for driving the sampler 40 to act, and a controller. The sampler 40 is connected to the driver 50, the driver 50 is connected to the controller, and the controller controls the driver 50 to drive the sampler 40 to be inserted into the sampling slot 20 and then drive the sampler 40 to move above the dilution tank 30 after the sampler 40 finishes sampling. The sampler 40 is connected to a controller which controls the sampler 40 to be activated after being inserted into the sampling well 20 to suck a predetermined amount of the sample liquid to be treated, and to be activated after being moved above the diluting well 30 to add the sucked sample liquid to be treated into the diluting well 30.

Alternatively, as shown in fig. 4-6, the sampler 40 includes a sampling needle 41 inserted into the sampling slot 20 to suck the sample liquid to be processed, and the upper end of the sampling needle 41 is connected to a containing body 42 having a containing cavity 420, and the containing cavity 420 is communicated with the sampling needle 41 to contain the sample liquid to be processed sucked by the sampling needle 41. The accommodating cavity 420 is also communicated with a pressure device 43, and the pressure device 43 is connected with a controller. The controller controls the pressure device 43 to act to generate negative pressure so as to suck the sample liquid to be processed into the accommodating cavity 420 from the sampling needle 41 and hold the sample liquid, or the controller controls the pressure device 43 to act to generate positive pressure so as to push the sample liquid to be processed held in the accommodating cavity 420 into the dilution tank through the sampling needle 41. The container 42 is connected to a sample liquid monitoring unit 44, and the sample liquid monitoring unit 44 is connected to the controller, so that when the amount of the sample liquid to be processed in the container 420 reaches a predetermined amount, the controller controls the pressure unit 43 to maintain the pressure, and the sampling needle 41 stops sucking the sample liquid to be processed. In this alternative embodiment, the pressure device 43 is a plunger pump, and the driver 50 is a mechanical arm for driving the sampler 40 to move up, down, left, and right.

When the sampler 40 works, after the sampling needle 41 is inserted into the sample liquid to be processed in the sampling tank 20, the controller controls the plunger pump to start to generate negative pressure, the sample liquid to be processed in the sampling tank 20 enters the accommodating cavity 420 of the accommodating body 42 from the sampling needle 41 under the action of negative pressure suction force to be accommodated, the sample liquid monitoring piece 44 monitors the amount of the sample liquid to be processed in the accommodating cavity 420 in real time in the process of sucking the sample liquid to be processed into the accommodating cavity 420, when the amount of the sample liquid to be processed in the accommodating cavity 420 reaches a preset amount, the sample liquid monitoring piece 44 feeds the result back to the controller, and the controller controls the plunger pump to maintain pressure so that the sampling needle 41 stops sucking the sample liquid to be processed, so that the sampling of the sample liquid to be processed is completed; when the sampling needle 41 is located above the dilution pool 30, the controller controls the plunger pump to generate a positive pressure, and the sample liquid to be processed contained in the containing cavity 420 is pushed into the dilution pool 30 through the sampling needle 41 under the positive pressure, so as to complete the sample preparation operation of the sample liquid to be processed. Because the sodium aluminate solution has the characteristics of high temperature (130 ℃), strong alkali (280g/L), high solid content (150g/L), easy precipitation, high viscosity and the like, a sampling part is not suitable for adopting a sampling pipeline structure formed by a valve body, the sampling pipeline structure is easy to block, and a rubber part in the valve body structure is easy to corrode, so that the valve body fails to work.

Further, as shown in fig. 4 to 6, the sampling needle 41 is a hollow tube having both ends connected. The accommodating body 42 is fixedly connected to the top of the sampling needle 41, and the outer side wall of the accommodating body 42 is also fixedly connected with a connecting joint 45 communicated with the accommodating cavity 420. The pressure device 43 is detachably connected with the connecting joint 45.

In this alternative, the first embodiment of the sampler 40, shown in fig. 4, is a conductive solution with conductive properties for sodium aluminate solution. The sampling needle 41 and/or the housing 42 are electrically conductive. Or the sampling needle 41 and/or the accommodating body 42 are/is provided with electric conductors. The sample liquid monitoring member 44 includes a detection electrode 441 mounted on the accommodating body 42 and connected to the accommodating body 42 in an insulating manner, a first end of the detection electrode 441 extends into the accommodating cavity 420, and a second end of the detection electrode 441 extends out of the accommodating body 42 and is connected to a first conductive wire 442 for conducting electricity. The sample liquid monitoring member 44 further includes a second conducting wire 443 connected to the conductive portion of the sampling needle 41 and/or the accommodating body 42, wherein the second conducting wire 443, the first conducting wire 442 and the control device are connected to form a conductive loop, so that the conductive loop is connected when the sodium aluminate solution in the accommodating cavity 420 contacts with the first end of the detection electrode 441, and the control device controls the pressure device 43 to maintain pressure to stop the sampling needle 41 from sucking the sodium aluminate solution. During sampling, when the sodium aluminate solution in the accommodating cavity 420 contacts with the first end of the detection electrode 441, the sodium aluminate solution, the sampling needle 41, the second lead 443, the detection electrode 441, the first lead 442 and the control device are connected to form a conductive loop because the sodium aluminate solution is a conductive solution with conductive performance, or the sodium aluminate solution, the accommodating body 42, the second lead 443, the detection electrode 441, the first lead 442 and the control device are connected to form a conductive loop, when the conductive loop is communicated, the control device controls the plunger pump to maintain pressure so that the sampling needle 41 stops sucking the sodium aluminate solution, and further the sampler 40 sucks quantitative sodium aluminate solution.

Further, the accommodating body 42 includes an accommodating body with an upper end opening and an accommodating cavity 420, and a sealing cover for sealing the accommodating cavity 420 is disposed at the upper end opening of the accommodating body, and the sealing cover is an insulator. The upper end of the sampling needle 41 is inserted into the accommodating cavity 420 from the bottom of the accommodating body. The sealing cover is provided with a mounting hole, and the detection electrode 441 is vertically inserted into the mounting hole and is in interference fit with the mounting hole. The detection electrode 441 is in insulated connection with the sealing cover, so that a short circuit of a loop is avoided; the detection electrode 441 is connected with the sealing cover in an interference fit manner, so that the preset amount of the solution to be treated can be adjusted by adjusting the height of the detection electrode 441 inserted into the accommodating cavity 420, and the adjustment operation is simple, flexible and easy to implement.

In this alternative, the second embodiment of sampler 40, as shown in fig. 5, has a transparent housing 42. The sample liquid monitoring member 44 comprises a liquid level sensor 444 connected to the outer side wall of the accommodating body 42, the liquid level sensor 444 is connected to the control device to send a sample liquid reaching amount signal to the control device when the height of the sodium aluminate solution in the accommodating cavity 420 reaches a set height, and the control device controls the pressure device 43 to maintain pressure according to the received sample liquid reaching amount signal so that the sampling needle 41 stops sucking the sodium aluminate solution. During sampling, when the height of the sodium aluminate solution in the accommodating cavity 420 reaches a set height, the amount of the sodium aluminate solution reaches a preset amount, at the moment, the liquid level sensor 444 sends a sample liquid amount reaching signal to the control device, and the control device controls the plunger pump to maintain pressure according to the received sample liquid amount reaching signal so that the sampling needle 41 stops sucking the sodium aluminate solution, and further the sampler 40 sucks quantitative sodium aluminate solution. In the actual use process, the preset amount of the sodium aluminate solution can be adjusted only by adjusting the installation height of the liquid level sensor 444 on the accommodating body 42, and the adjustment operation is simple, flexible and easy to implement. In the alternative, the liquid level sensor 444 cannot be arranged at a position directly contacted with the sodium aluminate solution because the sodium aluminate solution has the characteristics of high temperature (50-130 degrees), strong alkali (80-280 g/L), high solid content (0-800 g/L), easy precipitation, high viscosity and the like, and in the alternative, the accommodating body 42 is a transparent accommodating body, and the liquid level sensor 444 is arranged on the outer side wall of the accommodating body 42, so that the existing technical problem is solved.

In this alternative embodiment, as shown in fig. 6, the sample liquid monitoring member 44 of the third embodiment of the sampler 40 comprises a transparent tube 445 disposed in the containing chamber 420 and being transparent, and a liquid level sensor 444 connected to the sidewall of the containing chamber 420. The upper end of the sampling needle 41 is inserted into the transparent tube 445 to communicate with the transparent tube 445. The liquid level sensor 444 is connected with the control device to send a sample liquid reaching signal to the control device when the height of the sodium aluminate solution in the transparent tube 445 reaches a set height, and the control device controls the pressure device 43 to maintain pressure according to the received sample liquid reaching signal so that the sampling needle 41 stops sucking the sodium aluminate solution. During sampling, when the height of the sodium aluminate solution in the transparent tube 445 reaches a set height, the amount of the sodium aluminate solution reaches a preset amount, at this time, the liquid level sensor 444 sends a sample liquid amount reaching signal to the control device, and the control device controls the plunger pump to maintain pressure according to the received sample liquid amount reaching signal so that the sampling needle 41 stops sucking the sodium aluminate solution, and further, the sampler 40 sucks quantitative sodium aluminate solution. In the actual use process, the preset amount of the sodium aluminate solution can be adjusted only by adjusting the installation height of the liquid level sensor 444 on the inner side wall of the accommodating cavity 420, and the adjustment operation is simple, flexible and easy to implement. In this alternative, because sodium aluminate solution has high temperature (130 degrees), strong base (280g/L), high solid content (150g/L), easily appear, characteristics such as viscosity height, so level sensor 444 can not set up in the position with sodium aluminate solution direct contact, in this alternative, through be provided with the transparent tube 445 who forms by transparent material preparation in holding chamber 420, and level sensor 444 sets up on the inside wall of holding chamber 420, thereby solve the technical problem that should exist, and compare in that level sensor 444 sets up on the lateral wall of holding body 42, when level sensor 444 sets up on the inside wall of holding chamber 420, can effectively protect level sensor 444, avoid it to receive mechanical damage.

Further, as shown in fig. 6, sealing members 46 for sealing are respectively disposed between the accommodating chamber 420 and the transparent tube 445 and between the transparent tube 445 and the accommodating body 42, and the sealing members 46 perform functions of propping up the transparent tube 445 and sealing the gas. Preferably, the seal 46 is formed from a material that is resistant to corrosion by sodium aluminate solutions.

Optionally, as shown in fig. 3, the sampling tank 20 comprises a sampling tank body 21 for containing the sodium aluminate solution, and a heat preservation device for preserving heat of the contained sodium aluminate solution is arranged in the sampling tank body 21. In the specific embodiment of this alternative, the heat preservation device is the device that is used for heating the heat preservation to the object that commonly uses on the market, and sampling groove 20 not only can make the sodium aluminate solution of holding flow in real time to have the constant temperature function of keeping warm, guaranteed that sodium aluminate solution can not be because of temperature reduction and solution is appeared when getting into sampling groove 20, and then guarantee the stability of sample quality and sample. The lateral wall of sample groove body 21 is connected with sampling pipe 22 and drain pipe 23 rather than the inner chamber and communicate respectively, and the input of sampling pipe 22 communicates with the output of buffer tank to with the leading-in sample groove body 21 of sodium aluminate solution, drain pipe 23 and the recovery house steward intercommunication that is used for retrieving sodium aluminate solution, drain pipe 23 and sampling pipe 22 cooperate and be used for making sodium aluminate solution flow in real time in sample groove body 21. In this alternative embodiment, the sampling tube 22 is a commercially available heat trace tube with heat trace function. Sampling tube 22 adopts stainless steel to have the heat tracing function, and can set up the heat tracing control temperature according to the sodium aluminate solution temperature of different production stages, guarantee that the sample does not produce the difference because of the temperature, stainless steel has also guaranteed under alkali, high temperature condition, sampling tube 22's life.

Optionally, as shown in fig. 3, a heat preservation device for preserving heat of the contained sodium aluminate dilution liquid is arranged in the dilution pool 30. In the specific embodiment of this alternative, the heat preservation device is the device that is used for heating the heat preservation to the object that commonly uses on the market, and dilution tank 30 has the constant temperature function of keeping warm, has guaranteed that sodium aluminate diluent can not be because of temperature reduction solution is appeared in dilution tank 30, and then guarantees the stability of sodium aluminate diluent quality.

Optionally, as shown in fig. 7, the on-line analyzer includes a first detection cell 70 and a second detection cell 80, and the first detection cell 70 and the second detection cell 80 are respectively communicated with the output end of the automatic sampling and sample preparing device, so that the sodium aluminate diluent enters the first detection cell 70 and the second detection cell 80 respectively. The first detecting cell 70 is further communicated with a first reagent supplying device 110, the first reagent supplying device 110 is connected with the control device, and the first reagent supplying device 110 is used for adding a first group of reaction reagents into the first detecting cell 70 so as to enable the first detecting cell 70 to react to form a total reaction solution for the control device to obtain the concentration value of the alumina. The second detection cell 80 is further communicated with a second reagent supply device, the second reagent supply device is connected with the control device, and the second reagent supply device is used for adding a second group of reaction reagents into the second detection cell 80 so as to enable the second detection cell 80 to react to form a total reaction liquid for the control device to obtain intermediate variables of total alkali and carbonate. The first detection cell 70 and the second detection cell 80 are further respectively connected with a titration end point detection device 140, the titration end point detection device 140 is connected with the control device, the titration end point detection device 140 is used for detecting the color change of the reaction solution in the first detection cell 70 or the second detection cell 80 and sending a reaction completion signal to the control device when the color is a set color, and the control device correspondingly controls the first reagent supply device 110 or the second reagent supply device to act according to the received reaction completion signal so as to stop the continuous addition of the reaction reagent. Alternatively, the titration end point detection device 140 is configured to detect a voltage change or a current change of the reaction solution in the first detection cell 70 or the second detection cell 80, and send a reaction completion signal to the control device when the voltage is a set voltage or the current is a set current, and the control device correspondingly controls the first reagent supply device 110 or the second reagent supply device to operate according to the received reaction completion signal to stop the continuous addition of the reaction reagent.

When the on-line analyzer works, sodium aluminate diluent firstly enters a first detection pool 70 and a second detection pool 80 from the output end of an automatic sampling and sample preparing device respectively, then a control device controls a first reagent supply device 110 and a second reagent supply device to act respectively, the first reagent supply device 110 adds a first group of reaction reagents into the first detection pool 70, the second reagent supply device adds a second group of reaction reagents into the second detection pool 80, in the adding process of the first group of reaction reagents and the second group of reaction reagents, a titration end point detection device 140 observes the color change of the reaction solutions in the first detection pool 70 and the second detection pool 80 in real time so as to send a reaction completion signal to the control device when the color is a set color, and the control device correspondingly controls the first reagent supply device 110 or the second reagent supply device to act according to the received reaction completion signal so as to stop the continuous addition of the reaction reagents, the titration end point detection device 140 observes the voltage changes of the reaction solutions in the first detection cell 70 and the second detection cell 80 in real time, so as to send a reaction completion signal to the control device when the voltage is a set voltage, the control device correspondingly controls the first reagent supply device 110 or the second reagent supply device to act according to the received reaction completion signal so as to stop the continuous addition of the reaction reagent, when the titration of the first detection cell 70 is completed, the first detection cell 70 reacts to generate a full reaction solution for the control device to obtain an alumina concentration value, when the titration of the second detection cell 80 is completed, the second detection cell 80 reacts to generate a full reaction solution for the control device to obtain a full alkali and a carbonate intermediate variable, and finally the control device obtains the concentration values and the caustic ratio of the alumina, the full alkali, the carbonate and the caustic alkali. When the online analyzer works, the sampling of the sodium aluminate diluent, the titration of the reagent, the judgment of the reagent titration end point and the acquisition of the concentration values and the causticity ratios of the alumina, the total alkali, the carbonate and the caustic alkali are all automatically carried out, so that the whole detection and analysis efficiency is improved, and the whole process is not manually participated, so that the detection and analysis result is stable, the fluctuation range is small, the accuracy of the detection and analysis result is high, and the labor intensity of detection and analysis personnel is very low.

Optionally, as shown in fig. 8 to 10, the first detection cell 70 and the second detection cell 80 have the same structure, and both of them respectively include a detection cell body 91 with two closed ends and a hollow cylinder shape, a diluent connection tube 92, a plurality of reagent connection tubes 93, and an air connection tube 94 inserted into an inner cavity of the detection cell body 91 are disposed on an outer side wall of the detection cell body 91, and a reaction liquid connection tube 95 inserted into an inner cavity of the detection cell body 91 is disposed at a position near the bottom of the detection cell body 91 or an outer side wall of the detection cell body 91. The input end of the diluent connecting pipe 92 is communicated with the output end of the automatic sampling and sample preparing device, so that the sodium aluminate diluent enters the detection pool body 91. The input end of each reagent adapter tube 93 is respectively communicated with the first reagent supply device 110, so that the first group of reaction reagents are respectively added into the detection cell body 91 of the first detection cell 70, or the input end of each reagent adapter tube 93 is respectively communicated with the second reagent supply device, so that the second group of reaction reagents are respectively added into the detection cell body 91 of the second detection cell 80. The input end of the air connection tube 94 is communicated with the atmosphere to allow the atmosphere to enter the detection cell body 91 so as to balance the air pressure in the detection cell body 91. The reaction liquid connection pipe 95 is communicated with the waste liquid recovery pipe to discharge the waste liquid in the detection cell body 91.

Specifically, referring to fig. 7, when the solution is a sodium aluminate diluent, the first reagent supplying device 110 includes two plunger pumps, the two plunger pumps are respectively connected to the control device, and the two plunger pumps are used for pumping two different reagents, the number of the reagent connecting pipes 93 is two, the two reagent connecting pipes 93 are respectively connected to the two plunger pumps, during the reagent titration, the control device firstly controls the first plunger pump to operate according to the titration reaction condition of the sodium aluminate solution (the plunger pump located below in fig. 7 is used, the plunger pump is filled with a titration solution, the titration solution enters the cavity of the plunger pump, and then the titration solution is pushed out of the titration solution by combining with the three-way valve on the plunger pump pipeline), so that the first reagent in the plunger pump is continuously added into the first detecting pool 70, and the titration end point detecting device 140 observes the color change or the voltage change or the current change of the reaction solution in the first detecting pool 70 in real time, when the reaction between the diluted sodium aluminate solution in the first detection tank 70 and the first added reagent is complete, i.e. the color of the reaction solution is a preset color or the voltage of the reaction solution is a preset voltage or the current of the reaction solution is a preset current, the control device controls the first plunger pump to stop to block the continuous addition of the first reagent, and then controls the second plunger pump to act (the plunger pump positioned above in the figure 7, when in use, the plunger pump pumps other reagents or the diluted solution, the liquid does not enter the plunger pump cavity, the liquid is DCF1 (electromagnetic valve 1) connected with the plunger pump and the middle part of the lower DCF 2-DCF 7, the plunger pump is provided with a volume cavity, the volume cavity is provided with a liquid level sensor, the other reagents enter the volume cavity to be quantitatively filled with liquid level and then are filled into the detection tank, wherein each electromagnetic valve is externally connected with a reagent, Diluent, clear water, waste liquid, etc.) so that the second reaction reagent is continuously added into the first detection cell 70, and simultaneously the titration end point detection device 140 observes whether the solution in the first detection cell 70 is completely reacted or not in real time, and when the solution is completely reacted, the control device controls the second plunger pump to stop to block the continuous addition of the second reaction reagent, so that the full reaction liquid for the control device to obtain the concentration value of alumina is generated by the reaction in the first detection cell 70.

Further, when the solution is sodium aluminate dilution solution, the second reagent supplying means comprises a plunger pump, the plunger pump is connected with the control device, a reaction reagent is filled in the plunger pump, the number of the reagent connecting pipes 93 is one, the reagent connecting tube 93 is connected with a plunger pump, and in the process of reagent titration, the control device controls the plunger pump to act so as to continuously add the reaction reagent in the plunger pump into the second detection cell 80, meanwhile, the titration end point detection device 140 observes the color change or the voltage change of the reaction solution in the second detection cell 80 in real time, when the reaction of the sodium aluminate diluent in the second detection cell 80 with the added reaction reagent is complete, that is, when the color of the reaction solution is the preset color or the voltage of the reaction solution is the preset voltage, the control device controls the plunger pump to stop to block the continuous addition of the reaction reagent, and the reaction in the second detection cell 80 generates the total reaction liquid for the control device to obtain the intermediate variable values of the total alkali and the carbonate alkali.

Preferably, a solenoid valve for controlling the on-off of the air connecting pipe 94 is arranged in the pipeline, and the solenoid valve is connected with the control device.

Preferably, as shown in fig. 8 to 10, the diluent connection pipe 92, the reagent connection pipe 93 and the air connection pipe 94 are respectively inserted into the middle of the inner cavity of the detection cell body 91 perpendicularly to the outer side wall of the detection cell body 91, and the diluent connection pipe 92 and one of the reagent connection pipes 93 are close to the bottom of the detection cell body 91 and extend into the sodium aluminate diluent in the detection cell body 91, and when the number of the reagent connection pipes 93 is one, the reagent connection pipe 93 is arranged close to the bottom of the detection cell body 91 and extends into the sodium aluminate diluent in the detection cell body 91.

Because the precision of titration detection directly has direct relation with the accuracy of the volume of beating into sodium aluminate diluent and reactant in the detection pond body 91 at every turn, consequently, the sodium aluminate diluent and the reactant of beating into can all get into in the detection zone of detection pond body 91 at best, it is best to have other places that sodium aluminate diluent or reactant splashed to detection pond body 91 inner wall, consequently, the lateral wall setting of the perpendicular detection pond body 91 of diluent takeover 92 and reagent takeover 93 homoenergetic that is used for beating into important reactant, this kind of setting up mode is favorable to the accuracy of sodium aluminate solution or reagent to be beaten into most. Furthermore, the diluent connecting pipe 92 and the reagent connecting pipe 93 for driving important reagents are close to the bottom of the detection pool body 91 and extend into the sodium aluminate diluent in the detection pool body 91, so that the driving path of the solution and the reagents is shortened, the solution or the reagents can be driven into other positions, and the loss of the solution or the reagents can be further reduced.

Preferably, as shown in fig. 9, the first detection cell 70 and the second detection cell 80 further include a stirrer 150, respectively, the stirrer 150 is connected to the top end of the detection cell body 91, and the stirrer 150 is connected to the control device, and the stirring end of the stirrer 150 penetrates through the top end of the detection cell body 91 and then extends into the sodium aluminate dilution, so as to uniformly stir the reaction solution in the detection cell body 91. Specifically, the stirrer 150 includes a stirring motor 151 fixed to the top end of the detection cell body 91, and a stirring rod 152 connected to the stirring motor 151, the stirring motor 151 is connected to the control device, and the lower end of the stirring rod 152 penetrates through the top end of the detection cell body 91 and then is vertically inserted into the reaction solution. The precision of titration detection is directly related to the accuracy of titration and whether stirring is uniform and stable, under the condition that the detection cell body 91 is fixed, the positions of the diluent connecting pipe 92 and the reagent connecting pipe 93 directly determine the titration precision, when the titration end point detection device 140 is a light source 141 and a photosensitive sensor 142, the position of the stirring impeller connected with the bottom end of the stirring rod 152 cannot influence the light path detection of the titration end point detection device 140, therefore, the stirring impeller can only be suspended above the light path or sunk below the light path, the position of the stirring impeller should be as close as possible to the light path, but the light path is not influenced to be optimal.

Optionally, as shown in fig. 9, the titration end point detection device 140 includes a light source 141 and a photosensitive sensor 142, the light source 141 and the photosensitive sensor 142 are respectively disposed at two opposite sides of the detection cell body 91, the setting height of the light source 141 and the photosensitive sensor 142 is lower than the setting height of the sodium aluminate diluent in the detection cell body 91, and the photosensitive sensor 142 is connected to the control device. During operation, the color change of the reaction solution before and during titration is used for judging whether titration reaches a titration end point, the reference value calibration needs to be carried out on the light source 141 and the photosensitive sensor 142 when titration is started, in the titration process, the hardware circuit collects the signal value of the photosensitive sensor 142 in real time, the signal value is changed violently, or suddenly increased or suddenly decreased, or according to the change range exceeding a preset value, the hardware circuit can judge whether titration reaches the end point according to the change conditions, and therefore whether titration is stopped or continued is determined. Or the titration end point detection device 140 comprises an oxidation-reduction electrode, the oxidation-reduction electrode is connected to the top of the detection cell body 91 and is connected with the control device, and the lower end of the oxidation-reduction electrode penetrates through the top of the detection cell body 91 and then is vertically inserted into the sodium aluminate diluent. Or the titration end point detection device 140 comprises a PH electrode, the PH electrode is connected to the top of the detection cell body 91 and connected with the control device, and the lower end of the PH electrode penetrates through the top of the detection cell body 91 and then is vertically inserted into the sodium aluminate diluent. If an electrode sensor such as an oxidation-reduction electrode or a pH electrode is adopted, whether the end point is reached is judged according to the change of the voltage value output by the electrode sensor inserted into the reaction solution, when titration is started, a hardware circuit collects the voltage value of the electrode sensor as a reference, the voltage signal value of the electrode sensor is collected in real time after titration is started, and whether the end point is reached is judged according to the data such as whether the voltage signal reaches a preset value or the change speed is greater than the preset value.

Optionally, as shown in fig. 1, the online analysis system for sodium aluminate solution further comprises a cleaning device, which is connected to the third opening of the buffer tank and the main delivery pipe 60, respectively, to clean the buffer tank.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.