阅读说明：本技术 氯碱用亚硫酸钠溶液配制槽及配制系统 (Sodium sulfite solution preparation tank and preparation system for chlor-alkali ) 是由 蒲荣辉 谢明辉 于 2019-12-04 设计创作，主要内容包括：本发明公开了一种氯碱用亚硫酸钠溶液配制槽及配制系统,属于氯碱用亚硫酸钠溶液的配制技术领域。本发明通过在配制槽本体上设置保护气体连接端口后,通过与保护气体供给装置连接后能够向配制槽本体内通入保护气体,进而能够降低亚硫酸钠溶液配置过程中被氧化的情况。而且,由于配置过程中的亚硫酸钠溶液不会被氧化,因此可直接将配置好的亚硫酸钠溶液存储于配置槽本体内,而无需单独设置专门的储罐结构,且可长期存储；因而由于无储罐结构,且可长期存储,因此可增大配制槽本体的体积以减少配制频率,同时可将整个配制槽本体的主体部分安装于地面以下以避免人工向高处搬运,降低人工劳动强度。(The invention discloses a sodium sulfite solution preparation tank for chlor-alkali and a preparation system, belonging to the technical field of preparation of sodium sulfite solution for chlor-alkali. According to the invention, after the protective gas connecting port is arranged on the preparation tank body, the protective gas can be introduced into the preparation tank body after being connected with the protective gas supply device, so that the oxidation condition in the preparation process of the sodium sulfite solution can be reduced. In addition, the sodium sulfite solution in the preparation process can not be oxidized, so the prepared sodium sulfite solution can be directly stored in the preparation tank body, a special storage tank structure is not required to be independently arranged, and the sodium sulfite solution can be stored for a long time; therefore, the tank has no structure and can be stored for a long time, so that the volume of the preparation tank body can be increased to reduce the preparation frequency, and meanwhile, the main body part of the whole preparation tank body can be arranged below the ground to avoid manual high-place transportation, and the manual labor intensity is reduced.)

1. Sodium sulfite solution preparation tank for chlor-alkali, including preparation tank body (1) and rabbling mechanism (2), for configuring the cavity in preparation tank body (1), be provided with dog-house (3), pure water charging port (4) and configuration liquid play liquid port (5), its characterized in that on preparation tank body (1): still be provided with protective gas connection port (6) on preparing groove body (1), protective gas connection port (6) can be to after connecting with protective gas feeding device intercommunication through air supply line (8) in the configuration cavity is internal.

2. The sodium sulfite solution preparing tank for chlor-alkali of claim 1 wherein: a filter screen (9) is arranged in the feed opening (3), and a sealing cover (10) which can be opened and closed is arranged at the feed opening (3).

3. The sodium sulfite solution preparing tank for chlor-alkali of claim 1 wherein: stirring mechanism (2) include actuating mechanism (11), transmission shaft (12) and stirring leaf (13), the stirring leaf sets up in the configuration cavity of telling, actuating mechanism (11) are installed and are equipped with tank body (1) outside and actuating mechanism (11) and rotate the transmission through transmission shaft (12) and stirring leaf (13) and be connected.

4. The sodium sulfite solution preparing tank for chlor-alkali of claim 3 wherein: the stirring blades (13) are provided with two layers, and the two layers of stirring blades (13) are distributed at intervals along the axial direction of the transmission shaft (12).

5. The sodium sulfite solution preparing tank for chlor-alkali of any one of claims 1 to 4, characterized by: the main body part of the preparation tank body (1) is arranged below the ground.

6. Sodium sulfite for chlor-alkali formulating system comprising the sodium sulfite solution formulating tank for chlor-alkali of any one of the above claims 1 to 5, characterized in that: the liquid inlet end of the circulating pump (15) is connected with a liquid outlet port (5) of the prepared liquid on the preparation tank body (1) through a pipeline, the liquid outlet end of the circulating pump (15) is connected with the liquid inlet end of the membrane filtering device (14) through a pipeline, a penetrating liquid outlet port (16) on the membrane filtering device (14) is a sodium sulfite solution finished product outlet port, and a concentrated liquid outlet port (17) of the membrane filtering device (14) is connected with a backflow port (7) arranged on the preparation tank body (1) through a backflow pipeline (18) so as to backflow the concentrated liquid into the preparation tank body (1).

7. The sodium sulfite make-up system for chlor-alkali of claim 6 wherein: the device is characterized by also comprising a settling tank (19), wherein a branch pipeline (20) is arranged on the return pipeline (18), a valve is arranged on the branch pipeline (20), and the branch pipeline (20) is connected with the settling tank (19) so as to shunt the solution in the return pipeline (18) into the settling tank (19); a clear liquid return pipe (21) is arranged and communicated with the clear liquid part at the upper part of the settling tank (19), and the clear liquid return pipe (21) is connected with a return port (7) arranged on the preparation tank body (1) so as to return clear liquid into the preparation tank body (1); and a sediment discharge pipe (22) is arranged and communicated with the sediment part at the lower part of the settling tank (19), a valve is arranged on the sediment discharge pipe (22), and the sediment discharge pipe (22) is connected with a sediment discharge tank (23) so as to discharge sediment to the sediment discharge tank (23).

8. The sodium sulfite make-up system for chlor-alkali of claim 6 wherein: three branches, namely a primary refined brine branch (24), a membrane denitration branch (25) and a dechlorination branch (26), are connected and arranged on a penetrating fluid outlet port (16) of the membrane filtering device (14), and valves are respectively arranged on the three branches.

9. The sodium sulfite make-up system for chlor-alkali of claim 6 wherein: still include water diversion jar (27), water diversion jar (27) set up on the pipeline between the feed liquor end of circulating pump (15) and preparation groove body (1) to be provided with the valve on the connecting pipeline between water diversion jar (27) and circulating pump (15), still be provided with blue formula filter (30) on the pipeline between water diversion jar (27) and circulating pump (15).

10. A sodium sulfite dosing system for chloralkali as claimed in claim 9 wherein: a branch return pipeline (28) is arranged on a liquid outlet end pipeline of the circulating pump (15), the branch return pipeline (28) is connected with a return port (7) arranged on the preparation tank body (1), a valve is arranged on the branch return pipeline (28), and a valve is arranged on the liquid outlet end pipeline of the circulating pump (15) between the branch point of the branch return pipeline (28) and the membrane filtering device (14); the device is characterized by further comprising a pure water supply pipeline (29), wherein the pure water supply pipeline (29) is divided into three paths to be respectively connected with a pure water feeding port (4) on the preparation tank body (1), a liquid adding port on the water diversion tank (27) and a penetrating liquid outlet port (16) of the membrane filtering device (14), and valves are respectively arranged on the three paths of the pure water supply pipeline (29).

Technical Field

The invention relates to the technical field of preparation of sodium sulfite solution for chlor-alkali, in particular to a sodium sulfite solution preparation tank for chlor-alkali and a preparation system.

Background

The brine system in the chlor-alkali industry generally adopts 10 percent sodium sulfite solution to remove free chlorine in the brine, and the use points are as follows:

A. dechlorination: chemical dechlorination is carried out after the brine in the electrolytic cell is subjected to vacuum dechlorination;

B. the primary refined salt water is used: refined brine before the refined brine enters the resin tower;

C. the denitration by membrane method is: pretreatment of brine by membrane denitration.

At present, most enterprises in the chlor-alkali industry adopt 97 percent of bagged industrial sodium sulfite and add pure water to prepare 10 percent of sodium sulfite solution; the preparation tank used for the configuration adopts the arrangement mode of an upper layer preparation tank and a lower layer storage tank, and the middle parts are communicated by a connecting conduit; adding pure water into the upper preparation tank, stirring to prepare a sodium sulfite solution, and then introducing the sodium sulfite solution into the lower storage tank through a connecting conduit for temporary storage; when in use, the mixture is conveyed to each use point by a pump for use; reference may be made in particular to the process flow diagram shown in figure 3. The process device has the defects of 3 aspects:

1. frequent preparation and high labor intensity: because the sodium sulfite solution is easily oxidized into sodium sulfate in the air, the volume of the sodium sulfite preparation tank is generally designed to be smaller; the preparation tank has small volume, so the preparation is frequently needed every day; meanwhile, the preparation tank adopts a structure of upper-layer preparation and lower-layer storage, the position of a feed inlet of the bagged industrial sodium sulfite is higher, the bag needs to be manually climbed to the stairs, the bag is manually carried or the sodium sulfite bag is carried to the top of the tank by a forklift, the labor intensity of manual work is higher, and safety accidents are easily caused.

2. The solution contains impurities: although the industrial sodium sulfite with the content of 97 percent and pure water are adopted for preparation, impurities cannot be avoided to be brought in the raw materials and the preparation process, and the prepared 10 percent sodium sulfite solution is turbid and contains suspended particles. Introducing particulate suspended matter impurities to a brine system by adding a sodium sulfite solution; such as: after primary refining, saline water is brought into suspended matters, so that a resin tower and an ionic membrane are influenced; the light brine added with the sodium sulfite enters a membrane method denitration device, the sodium sulfite is further added for pretreatment, and the brine containing suspended particles is easy to be subjected to nanofiltration membrane denitration by the membrane method.

3. The addition flow is easy to fluctuate: in the chlor-alkali industry, a sodium sulfite preparation tank is generally arranged in a light brine dechlorination process, and in the process of transferring a sodium sulfite solution for brine refining and membrane process denitration each time, the addition flow fluctuation of light brine dechlorination is easily caused, so that the dechlorination light brine contains free chlorine and the linkage switching of a membrane process denitration device is caused, and the system stability is not facilitated.

Disclosure of Invention

The invention aims to provide a sodium sulfite solution preparation tank for chlor-alkali, which can reduce oxidation in the sodium sulfite solution preparation process.

The technical scheme adopted by the invention for solving the technical problems is as follows: sodium sulfite solution preparation tank for chlor-alkali, including preparation tank body and rabbling mechanism, for the configuration cavity in the preparation tank body, be provided with dog-house, pure water feed port and configuration liquid outlet port on the preparation tank body, still be provided with protective gas connection port on the preparation tank body, protective gas connection port can be to after passing through air supply line and protective gas feeding device intercommunication to supply protective gas in the configuration cavity.

Further, the method comprises the following steps: a filter screen is arranged in the feeding port, and a sealing cover which can be opened and closed is arranged at the feeding port.

Further, the method comprises the following steps: the stirring mechanism comprises a driving mechanism, a transmission shaft and stirring blades, the stirring blades are arranged in the configuration cavity, the driving mechanism is arranged outside the configuration tank body, and the driving mechanism is in transmission connection with the stirring blades through the transmission shaft.

Further, the method comprises the following steps: the stirring blades are provided with two layers, and the two layers of stirring blades are distributed at intervals along the axial direction of the transmission shaft.

Further, the method comprises the following steps: the main body part of the preparation tank body is arranged below the ground.

The sodium sulfite solution preparation tank for chlor-alkali disclosed by the invention has the beneficial effects that: after the protective gas connecting port is arranged, protective gas can be introduced into the preparation tank body after the protective gas supplying device is connected, and the situation that the sodium sulfite solution is oxidized in the preparation process can be reduced. In addition, the sodium sulfite solution in the preparation process can not be oxidized, so the prepared sodium sulfite solution can be directly stored in the preparation tank body, a special storage tank structure is not required to be separately arranged, and the sodium sulfite solution can be stored for a long time; therefore, the tank has no structure and can be stored for a long time, so that the volume of the preparation tank body can be increased to reduce the preparation frequency, and meanwhile, the main body part of the whole preparation tank body can be arranged below the ground to avoid manual high-place transportation, and the manual labor intensity is reduced.

In addition, the invention also provides a sodium sulfite preparation system for chlor-alkali, which comprises the sodium sulfite solution preparation tank for chlor-alkali, a membrane filtration device and a circulating pump, wherein the liquid inlet end of the circulating pump is connected with the liquid outlet port of the preparation solution on the preparation tank body through a pipeline, the liquid outlet end of the circulating pump is connected with the liquid inlet end of the membrane filtration device through a pipeline, the liquid outlet port of the penetrating fluid on the membrane filtration device is a sodium sulfite solution finished product outlet port, and the concentrated solution outlet port of the membrane filtration device is connected with the reflux port arranged on the preparation tank body through a reflux pipeline so as to reflux the concentrated solution into the preparation tank body.

Further, the method comprises the following steps: the device also comprises a settling tank, wherein a branch pipeline is arranged on the return pipeline, a valve is arranged on the branch pipeline, and the branch pipeline is connected with the settling tank to shunt solution in the return pipeline into the settling tank; a clear liquid return pipe is arranged and communicated with the clear liquid part at the upper part of the settling tank, and the clear liquid return pipe is connected with a return port arranged on the preparation tank body so as to return clear liquid into the preparation tank body; and the sediment discharge pipe is communicated with the sediment part at the lower part of the settling tank and is provided with a valve, and the sediment discharge pipe is connected with the sediment discharge tank so as to discharge sediment to the sediment discharge tank.

Further, the method comprises the following steps: three branches, namely a primary refined brine branch, a membrane denitration branch and a dechlorination branch, are connected to the penetrating fluid outlet port of the membrane filtering device, and valves are respectively arranged on the three branches.

Further, the method comprises the following steps: still include diversion jar, diversion jar sets up on the pipeline between the feed liquor end of circulating pump and the preparation groove body to be provided with the valve on the connecting pipeline between diversion jar and circulating pump, still be provided with blue formula filter on the pipeline between diversion jar and circulating pump.

Further, the method comprises the following steps: a branch return pipeline is arranged on a liquid outlet end pipeline of the circulating pump, the branch return pipeline is connected with a return port arranged on the preparation tank body, a valve is arranged on the branch return pipeline, and a valve is arranged on the liquid outlet end pipeline of the circulating pump between the branch point of the branch return pipeline and the membrane filtering device; the device also comprises a pure water supply pipeline which is divided into three paths and is respectively connected with a pure water feeding port on the preparation tank body, a liquid feeding port on the water tank and a penetrating fluid outlet port of the membrane filtering device, and valves are respectively arranged on the three paths of the pure water supply pipeline.

The sodium sulfite preparation system for chlor-alkali of the invention has the advantages that: the sodium sulfite solution preparation tank for chlor-alkali has the advantages of the sodium sulfite solution preparation tank for chlor-alkali; simultaneously through setting up membrane filter equipment, further realized the membrane filtration processing to the sodium sulfite solution after the configuration, ensured that the sodium sulfite solution after the filtration is limpid, avoided introducing the problem of impurity for the brine system after adding sodium sulfite solution. In addition, subside through setting up the subsider, it is higher to contain impurity to the discharged concentrate of membrane filter equipment, has dispeled the impurity in the concentrate effectively on the one hand, and then the waste of sodium sulfite solution is avoided on the other hand. In addition, the membrane filter device is backwashed by setting pure water, so that the regeneration of the filter membrane is realized.

Drawings

FIG. 1 is a process flow diagram of the sodium sulfite preparation system for chlor-alkali of the present invention.

FIG. 2 is a schematic diagram of the structure of a tank for preparing sodium sulfite solution for chlor-alkali.

Fig. 3 is a process flow diagram of a sodium sulfite preparation system for chlor-alkali in the prior art.

Labeled as: the device comprises a preparation tank body 1, a stirring mechanism 2, a feed port 3, a pure water feeding port 4, a prepared liquid outlet port 5, a protective gas connecting port 6, a backflow port 7, an air supply pipeline 8, a filter screen 9, a sealing cover 10, a driving mechanism 11, a transmission shaft 12, stirring blades 13, a membrane filtering device 14, a circulating pump 15, a penetrating liquid outlet port 16, a concentrated liquid outlet port 17 and a backflow pipeline 18, and further comprises a settling tank 19, a branched pipeline 20, a clear liquid backflow pipe 21, a sediment discharge pipe 22, a slag discharge tank 23, a primary refined brine branch 24, a membrane method denitration branch 25, a dechlorination branch 26, a water diversion tank 27, a branched backflow pipeline 28, a pure water supply pipeline 29 and a blue filter 30.

Detailed Description

The invention is further described with reference to the following figures and detailed description.

As shown in fig. 1 and 2, the sodium sulfite solution preparation tank for chlor-alkali of the present invention comprises a preparation tank body 1 and a stirring mechanism 2, wherein a preparation cavity is arranged in the preparation tank body 1, a feeding port 3, a pure water feeding port 4 and a preparation liquid outlet port 5 are arranged on the preparation tank body 1, a protective gas connection port 6 is further arranged on the preparation tank body 1, and the protective gas connection port 6 can supply protective gas into the preparation cavity after being communicated with a protective gas supply device through an air supply pipeline 8.

When carrying out sodium sulfite solution configuration operation, accessible air supply line 8 lets in protective gas in the configuration cavity of preparing tank body 1 by protective gas connecting port 6 to the air in the configuration cavity of discharge, and then under protective gas's guard action, can effectual reduction sodium sulfite solution's oxidation. The protective gas is a gas capable of avoiding reaction with the sodium sulfite solution, and can be nitrogen. In addition, without loss of generality, the gas supply line 8 may be provided with a valve in order to facilitate adjustment and control of the supply flow rate of the shielding gas.

In addition, the solution after the preparation can be effectively protected by the protective gas, so that the preparation tank does not need to be provided with a storage tank structure; the preparation and storage of the sodium sulfite solution can be realized by a preparation cavity of the preparation tank body 1; and because need not worry the oxidation problem in the configuration process and after the configuration, consequently the volume of preparation groove can set up bigger for original preparation groove, and then can reduce the preparation frequency, can install the main part of whole preparation groove body 1 below ground in order to avoid artifical to the eminence transport simultaneously, reduces artifical intensity of labour.

In addition, referring to fig. 2, a filter screen 9 may be further provided at the feed opening 3, through which preliminary filtration of the bagged industrial sodium sulfite fed from the feed opening 3 may be performed. In addition, an openable and closable sealing cover 10 can be further arranged at the feeding port 3; therefore, the sealing cover 10 can play a role in sealing, so that the feed opening 3 can be sealed after the sodium sulfite in the bagged industry is put in, the configuration cavity in the whole preparation tank body 1 is in a roughly closed state, the leakage condition of the protective gas can be reduced, and the utilization efficiency of the protective gas is improved.

In addition, the stirring structure 2 in the present invention is for stirring during the dispensing process, and is consistent with a stirring mechanism provided in a conventional dispensing tank. Specifically, the stirring mechanism 2 comprises a driving mechanism 11, a transmission shaft 12 and a stirring blade 13, wherein the stirring blade is arranged in the configuration cavity, the driving mechanism 11 is arranged outside the preparation tank body 1, and the driving mechanism 11 is in transmission connection with the stirring blade 13 through the transmission shaft 12. In addition, in order to improve the stirring efficiency, the stirring vanes 13 of the present invention are provided in two layers, and the two layers of stirring vanes 13 are spaced apart from each other in the axial direction of the transmission shaft 12.

The configuration process of the invention is as follows: calculating the amount of bagged sodium sulfite to be added according to the volume and the concentration of 10 percent; unpacking the bagged sodium sulfite, pouring the unpacked sodium sulfite into a feed inlet 3, putting the packed sodium sulfite into a preparation tank body 1, and then covering a sealing cover 10; pure water is then added from the pure water feed port 4 through the pure water supply line 29 to a level of about 80%; the stirring mechanism 2 is started to stir for about 1 hour to obtain a prepared solution. Wherein, in the whole operation process, protective gas can be continuously introduced into the preparation tank body 1 through the protective gas connecting port 6, and the introduction is stopped after a period of time after the preparation is finished, so as to replace the internal air, thereby preventing the oxidation problem in the solution preparation process and the storage process after the preparation.

The invention also provides a sodium sulfite preparation system for chlor-alkali, which comprises the sodium sulfite solution preparation tank for chlor-alkali, a membrane filtration device 14 and a circulating pump 15, wherein the liquid inlet end of the circulating pump 15 is connected with the prepared solution outlet port 5 on the preparation tank body 1 through a pipeline, the liquid outlet end of the circulating pump 15 is connected with the liquid inlet end of the membrane filtration device 14 through a pipeline, the penetrating solution outlet port 16 on the membrane filtration device 14 is a sodium sulfite solution finished product outlet port, and the concentrated solution outlet port 17 of the membrane filtration device 14 is connected with the reflux port 7 arranged on the preparation tank body 1 through a reflux pipeline 18 so as to reflux the concentrated solution into the preparation tank body 1.

The sodium sulfite solution prepared in the preparation tank body 1 is pumped into the membrane filtering device 14 through the circulating pump 15, and a clearer sodium sulfite solution is obtained after filtration, and then is directly conveyed to each use point after being discharged from a penetrating fluid outlet port 16 on the membrane filtering device 14. More specifically, considering that the number of the points of use is usually three in the actual working condition, the three branches, namely the primary refined brine branch 24, the membrane denitration branch 25 and the dechlorination branch 26, are connected to the permeate outlet port 16 of the membrane filtration device 14, and valves are respectively arranged on the three branches. That is, the three branches respectively deliver the penetrating fluid discharged from the penetrating fluid outlet port 16 to a single use point such as primary refined brine, membrane denitration and dechlorination.

In addition, the invention is further provided with a settling tank 19, a branch pipeline 20 is arranged on the return pipeline 18, a valve is arranged on the branch pipeline 20, and the branch pipeline 20 is connected with the settling tank 19 to shunt the solution in the return pipeline 18 into the settling tank 19; a clear liquid return pipe 21 is arranged and communicated with a clear liquid part at the upper part of the settling tank 19, and the clear liquid return pipe 21 is connected with a return port 7 arranged on the preparation tank body 1 so as to return clear liquid into the preparation tank body 1; and a sediment discharge pipe 22 is arranged and communicated with the sediment part at the lower part of the settling tank 19, a valve is arranged on the sediment discharge pipe 22, and the sediment discharge pipe 22 is connected with a slag discharging pool 23 so as to discharge sediment to the slag discharging pool 23. Through setting up subsider 19, can will contain the concentrate part reposition of redundant personnel of higher impurity from membrane filtration device 14 and subside to subsider 19 and handle to dispel the impurity in the concentrate, return the clear liquid after the settlement treatment simultaneously to preparation groove body 1 and realize reuse, can avoid the waste of sodium sulfite solution.

In addition, the invention is also provided with a water diversion tank 27, the water diversion tank 27 is arranged on a pipeline between the liquid inlet end of the circulating pump 15 and the preparation tank body 1, a valve is arranged on a connecting pipeline between the water diversion tank 27 and the circulating pump 15, and a blue filter 30 is also arranged on a pipeline between the water diversion tank 27 and the circulating pump 15. Through setting up water diversion tank 27, can be more favorable to using with circulating pump 15 is supporting for the start-stop operation of circulating pump 15 is more convenient. By arranging the blue filter 30, the solution can be subjected to primary filtration treatment before entering the membrane filtration device, so that the operation load of the membrane filtration device is reduced.

In addition, a branch return pipeline 28 is further arranged on the liquid outlet end pipeline of the circulating pump 15, the branch return pipeline 28 is connected with the return port 7 arranged on the preparation tank body 1, a valve is arranged on the branch return pipeline 28, and a valve is arranged on the liquid outlet end pipeline of the circulating pump 15 between the branch point of the branch return pipeline 28 and the membrane filtering device 14; after the bifurcated return line 28 is arranged, the circulating flow generated in the preparation tank body 1 by the circulating pump 15 can be realized by controlling the opening and closing of the corresponding valve, and the circulating flow effect of the solution can be improved in the process of preparing the solution, so that the preparation effect of the solution is improved.

In addition, the invention is also provided with a pure water supply pipeline 29, the pure water supply pipeline 29 is divided into three paths and is respectively connected with the pure water feeding port 4 on the preparation tank body 1, the liquid feeding port on the water tank 27 and the penetrating fluid outlet port 16 of the membrane filtering device 14, and valves are respectively arranged on the three paths of the pure water supply pipeline 29. The membrane filtering device is backwashed by setting pure water to realize the regeneration of the filtering membrane; and through adding pure water in to leading water tank 27, can regard as initial solution when leading water tank 27 starts, produce the negative pressure after discharging the pure water that adds in leading water tank 27 in advance through circulating pump 15, and then inhale leading water tank 27 with the solution after the configuration in the preparation groove body 1 in.