阅读说明：本技术 一种湿法脱硫浆液氧化过程实时控制的装置及方法 (Device and method for controlling oxidation process of wet desulphurization slurry in real time ) 是由 房孝维 何育东 李兴华 陶明 何仰朋 孟令海 余昭 吴晓龙 李楠 宦宣州 王韶晖 于 2021-08-30 设计创作，主要内容包括：本发明公开了一种湿法脱硫浆液氧化过程实时控制的装置及方法,包括控制系统、水力旋流器、亚硫酸盐测试箱、滤液池及若干氧化风机,其中,石膏浆液母管的取样口与水力旋流器的入口相连通,水力旋流器的顶部出口与亚硫酸盐测试箱的入口相连通,亚硫酸盐测试箱的出口与滤液池的入口相连通,亚硫酸盐测试箱的输出端与控制系统的输入端相连接,控制系统的输出端与各氧化风机的控制端相连接,该装置及方法能够实现对湿法脱硫浆液氧化过程的实时控制,同时避免固体冲刷对电极寿命及检测结果的影响,检测的准确性较高。(The invention discloses a device and a method for controlling the oxidation process of wet desulphurization slurry in real time, which comprises a control system, a hydrocyclone, a sulfite test box, a filtrate tank and a plurality of oxidation fans, wherein a sampling port of a gypsum slurry main pipe is communicated with an inlet of the hydrocyclone, an outlet at the top of the hydrocyclone is communicated with an inlet of the sulfite test box, an outlet of the sulfite test box is communicated with an inlet of the filtrate tank, an output end of the sulfite test box is connected with an input end of the control system, and an output end of the control system is connected with a control end of each oxidation fan.)

1. The utility model provides a device of wet flue gas desulfurization thick liquid oxidation process real time control, a serial communication port, including control system (2), hydrocyclone (7), sulfite test box (3), filtrate tank (8) and a plurality of oxidation fan (1), wherein, the sample connection of gypsum thick liquid female pipe (4) is linked together with the entry of hydrocyclone (7), the top export of hydrocyclone (7) is linked together with the entry of sulfite test box (3), the export of sulfite test box (3) is linked together with the entry of filtrate tank (8), the output of sulfite test box (3) is connected with the input of control system (2), the output of control system (2) is connected with the control end of each oxidation fan (1).

2. The apparatus for real-time control of the oxidation process of a wet desulfurization slurry according to claim 1, wherein a sampling port of the gypsum slurry main pipe (4) is communicated with an inlet of the hydrocyclone (7) through a pump (6).

3. The device for controlling the oxidation process of the wet desulphurization slurry in real time as claimed in claim 1, wherein the bottom outlet of the hydrocyclone (7) is communicated with the inlet of the vacuum belt conveyor (5).

4. A method for controlling the oxidation process of wet desulphurization slurry in real time, which is based on the device for controlling the oxidation process of wet desulphurization slurry in real time of claim 3, and comprises the following steps:

slurry output by the gypsum slurry main pipe (4) is sent into a hydrocyclone (7) for solid-liquid separation, wherein separated supernatant enters a sulfite test box (3), overflow slurry of the sulfite test box (3) is sent into a filtrate tank (8), and solid phase separated by the hydrocyclone (7) enters a vacuum belt conveyor (5). The sulfite test box (3) sends the measurement signal to the control system (2), the control system (2) calculates the sulfite content of the supernatant, calculates the deviation between the sulfite content of the supernatant and the critical sulfite content, and then controls each oxidation fan (1) according to the deviation, so that the deviation between the sulfite content of the supernatant and the critical sulfite content is in a preset range.

5. The method for controlling the oxidation process of the wet desulfurization slurry in real time as claimed in claim 4, wherein the sulfite test chamber (3) comprises a chamber body, and a redox electrode, a calcium ion online tester, a PH meter, an oxygen dissolving meter and a thermometer which are arranged on the chamber body, and the redox potential, Ca and the like are respectively detected by the redox electrode, the calcium ion online tester, the PH meter, the oxygen dissolving meter and the thermometer²⁺Concentration, H⁺The concentration,O₂The concentration and temperature signals are sent to a control system (2), and the control system (2) is used for controlling the concentration and temperature according to the oxidation-reduction potential and Ca²⁺Concentration, H⁺Concentration, O₂The concentration and temperature signals calculate the sulfite content of the supernatant.

6. The method for real-time control of the oxidation process of wet desulfurization slurry according to claim 5, wherein the box body comprises an elongated rectangular parallelepiped tank and a perforated cover plate fixed at an opening at the top of the elongated rectangular parallelepiped tank, wherein the redox electrode, the calcium ion online tester, the PH meter, the dissolved oxygen meter and the thermometer are all inserted into a through hole on the perforated cover plate.

7. The method of claim 4, further comprising determining a critical sulfite content.

8. The method of claim 4, wherein the process of determining the critical sulfite content is performed by:

1) obtaining a solid phase discharged from the bottom of the hydrocyclone (7), filtering to obtain a gypsum solid, flushing the gypsum solid by deionized water until the filtrate is neutral, and drying at 45 ℃ to obtain a gypsum sample;

2) determining the content of calcium sulfite in the gypsum sample by an iodometry method;

3) under different operating conditions, a comparison graph is drawn by taking the content of calcium sulfite in the gypsum sample as a horizontal coordinate and the content of sulfite overflowing from the hydrocyclone (7) as a vertical coordinate;

4) according to the requirement of the content of calcium sulfite contained in the gypsum, the content of sulfite overflowing from the corresponding hydrocyclone (7) is obtained from a comparison graph, and the content of sulfite overflowing from the hydrocyclone (7) is taken as the critical content of sulfite.

9. The method for real-time control of the oxidation process of wet-desulfurization slurry according to claim 4, wherein the control system (2) controls the number and frequency of the oxidation fans (1) according to the deviation.

Technical Field

The invention belongs to the technical field of chemistry, and relates to a device and a method for controlling the oxidation process of wet desulphurization slurry in real time.

Background

At present, the thermal power plant mainly adopts a limestone-gypsum wet desulphurization process to remove SO generated in the combustion process₂Oxidizing by an oxidizing fan to obtain by-product gypsum (CaSO)₄·2H₂O), if the oxidation is insufficient, sulfite is produced. The oxidation degree of the absorption tower desulfurization slurry can be evaluated by the content of sulfite contained in the absorption tower desulfurization slurry, the oxidation degree of the absorption tower desulfurization slurry in the wet desulfurization process is monitored in real time, the content of sulfite in the slurry is determined, the accurate adjustment of the oxidation air volume is facilitated, and the safe and energy-saving operation and automatic control of a desulfurization system are realized.

The evaluation of the absorption tower slurry oxidation process mainly adopts a method of manual sampling-laboratory detection. Compared with the actual situation, the oxidation condition of the pulp tested by the method has larger delay, the sulfite is easy to oxidize, and the deviation between the detection result of a laboratory and the actual situation in the pulp is larger. The on-line monitoring mainly adopts an ORP (oxidation reduction potential) method along with oxygenThe oxidation-reduction potential (ORP) of the slurry system is changed along with the progress of the redox reaction, so that the oxidation-reduction process of the slurry can be judged by monitoring the ORP of the slurry, and the ORP is used as a basis for adjusting the air quantity of an oxidation fan to prevent the slurry from being under-oxidized or over-oxidized, thereby ensuring the quality of the gypsum. At present, the ORP method mostly only considers the influence of PH, but Ca is actually used²⁺(or SO)₄ ^2-) The concentration and the dissolved oxygen are related, and the obtained ORP value has poor corresponding relation with the content of sulfite; in addition, the existing ORP method directly measures the slurry, and the slurry contains a large amount of solid matters carried by limestone, gypsum and flue gas, so that the scouring strength of the oxidation-reduction electrode is large, the service life of the electrode and the precision of a test result are influenced, and the control of the whole oxidation process is further influenced.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a device and a method for controlling the oxidation process of wet desulphurization slurry in real time, the device and the method can realize the real-time control of the oxidation process of the wet desulphurization slurry, simultaneously avoid the influence of solid scouring on the service life of an electrode and a detection result, and have higher detection accuracy.

In order to achieve the aim, the device for controlling the oxidation process of the wet desulphurization slurry in real time comprises a control system, a hydrocyclone, a sulfite test box, a filtrate tank and a plurality of oxidation fans, wherein a sampling port of a gypsum slurry main pipe is communicated with an inlet of the hydrocyclone, an outlet at the top of the hydrocyclone is communicated with an inlet of the sulfite test box, an inlet of the filtrate tank at an outlet of the sulfite test box is communicated, an output end of the sulfite test box is connected with an input end of the control system, and an output end of the control system is connected with control ends of the oxidation fans.

The sampling port of the gypsum slurry main pipe is communicated with the inlet of the hydrocyclone through a pump.

The bottom outlet of the hydrocyclone is communicated with the inlet of the vacuum belt conveyor.

The method for controlling the oxidation process of the wet desulphurization slurry in real time comprises the following steps:

and feeding the slurry output by the gypsum slurry main pipe into a hydrocyclone for solid-liquid separation, wherein the separated supernatant enters a sulfite test box, the separated solid phase enters a vacuum belt conveyor, and the overflow slurry of the sulfite test box is fed into a filtrate tank. The sulfite test box sends the measurement signal to the control system, the control system calculates the content of sulfite in the supernatant, calculates the deviation between the content of sulfite in the supernatant and the critical content of sulfite, and then controls each oxidation fan according to the deviation, so that the deviation between the content of sulfite in the supernatant and the critical content of sulfite is in a preset range.

The sulfite test box comprises a box body, and an oxidation-reduction electrode, a calcium ion online tester, a PH meter, an oxygen dissolving instrument and a thermometer which are arranged on the box body, wherein the oxidation-reduction electrode, the calcium ion online tester, the PH meter, the oxygen dissolving instrument and the thermometer are used for respectively detecting oxidation-reduction potential and Ca²⁺Concentration, H⁺Concentration, O₂The concentration and temperature signals are sent to a control system according to the oxidation-reduction potential and Ca²⁺Concentration, H⁺Concentration, O₂The concentration and temperature signals calculate the sulfite content of the supernatant.

The box includes rectangular shape cuboid groove and is fixed in the foraminiferous apron of rectangular shape cuboid groove top opening part, and wherein, redox electrode, calcium ion on-line measuring appearance, PH meter, dissolved oxygen appearance and thermometer all insert in the through-hole on foraminiferous apron.

Also included is determining a critical sulfite content.

The process for determining the critical sulfite content is:

1) obtaining a solid phase discharged from the bottom of the hydrocyclone, filtering to obtain a gypsum solid, flushing the gypsum solid by deionized water until the filtrate is neutral, and drying at 45 ℃ to obtain a gypsum sample;

2) determining the content of calcium sulfite in the gypsum sample by an iodometry method;

3) under different operating conditions, drawing a comparison graph by taking the content of calcium sulfite in the gypsum sample as a horizontal coordinate and the content of sulfite overflowing from the hydrocyclone as a vertical coordinate;

4) and according to the requirement on the content of calcium sulfite contained in the gypsum, obtaining the content of sulfite in the overflow of the corresponding hydrocyclone from the comparison map, and taking the content of sulfite in the overflow of the hydrocyclone as the critical content of sulfite.

And the control system controls the number and the frequency of the oxidation fans according to the deviation.

The invention has the following beneficial effects:

the device and the method for controlling the oxidation process of the wet desulphurization slurry in real time have the advantages that during specific operation, the slurry output by the gypsum slurry main pipe is subjected to solid-liquid separation through the hydrocyclone, wherein the supernatant enters the sulfite test box, so that the influence of solid scouring on the service life of a motor in the sulfite test box and a detection result is avoided, the detection precision is improved, in addition, the control system controls the oxidation fan according to the detection result so as to realize the real-time control of the oxidation process of the wet desulphurization slurry, the operation is convenient and simple, the practicability is strong, the flow is simple, no flushing device or other agents are needed in the whole process, and no waste water is generated.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the cover plate according to the present invention;

FIG. 3 is a flow chart of the present invention.

Wherein, 1 is an oxidation fan, 2 is a control system, 3 is a sulfite test box, 4 is a gypsum slurry main pipe, 5 is a vacuum belt conveyor, 6 is a pump, 7 is a hydrocyclone, and 8 is a filtrate tank.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.

Referring to fig. 1 and 2, the device for controlling the oxidation process of the wet desulfurization slurry in real time comprises a control system 2, a hydrocyclone 7, a sulfite test box 3, a filtrate tank 8 and a plurality of oxidation fans 1, wherein a sampling port of a gypsum slurry main pipe 4 is communicated with an inlet of the hydrocyclone 7, an outlet at the top of the hydrocyclone 7 is communicated with an inlet of the sulfite test box 3, an outlet of the sulfite test box 3 is communicated with an inlet of the filtrate tank 8, an output end of the sulfite test box 3 is connected with an input end of the control system 2, and an output end of the control system 2 is connected with a control end of each oxidation fan 1.

Specifically, a sampling port of the gypsum slurry main pipe 4 is communicated with an inlet of a hydrocyclone 7 through a pump 6, and a bottom outlet of the hydrocyclone 7 is communicated with an inlet of a vacuum belt conveyor 5.

The method for controlling the oxidation process of the wet desulphurization slurry in real time comprises the following steps:

and (3) feeding the slurry output from the gypsum slurry main pipe 4 into a hydrocyclone 7 for solid-liquid separation, wherein the separated supernatant enters a sulfite test box 3, the separated solid phase enters a vacuum belt conveyor 5, and the overflow slurry of the sulfite test box 3 is fed into a filtrate tank 8. The sulfite test box 3 sends the measurement signal to the control system 2, the control system 2 calculates the sulfite content of the supernatant and calculates the deviation between the sulfite content of the supernatant and the critical sulfite content, and then controls the working number and frequency of the oxidation fan 1 according to the deviation. So that the deviation between the sulfite content of the supernatant and the critical sulfite content is within a preset range, the control logic may refer to fig. 3.

The sulfite test box 3 comprises a box body, and an oxidation-reduction electrode, a calcium ion online tester, a PH meter, an oxygen dissolving instrument and a thermometer which are arranged on the box body, and oxidation-reduction potential and Ca are respectively detected by the oxidation-reduction electrode, the calcium ion online tester, the PH meter, the oxygen dissolving instrument and the thermometer²⁺Concentration, H⁺Concentration, O₂The concentration and temperature signals are sent to a control system 2, and the control system 2 controls the concentration and temperature according to the oxidation-reduction potential and Ca²⁺Concentration, H⁺Concentration, O₂The sulfite content of supernatant is calculated to concentration and temperature signal, wherein, the box includes rectangular shape cuboid groove and is fixed in the foraminiferous apron of rectangular shape cuboid groove top opening part, and wherein, redox electrode, calcium ion on-line measuring appearance, PH meter, dissolved oxygen appearance and thermometer all insert in the through-hole on foraminiferous apron.

The invention also comprises the following specific steps of determining the critical sulfite content:

1) obtaining a solid phase discharged from the bottom of the hydrocyclone 7, filtering to obtain a gypsum solid, flushing the gypsum solid by deionized water until the filtrate is neutral, and drying at 45 ℃ to obtain a gypsum sample;

2) determining the content of calcium sulfite in the gypsum sample by an iodometry method;

3) under different operating conditions, a comparison graph is drawn by taking the content of calcium sulfite in the gypsum sample as a horizontal coordinate and the content of sulfite overflowing from the hydrocyclone 7 as a vertical coordinate;

4) according to the requirement of the content of calcium sulfite contained in the gypsum, the corresponding sulfite content of the overflow of the hydrocyclone 7 is obtained from the comparison chart, and the sulfite content of the overflow of the hydrocyclone 7 is taken as the critical sulfite content.

Example one

In this embodiment, the measured sulfite content is less than 95% of the critical sulfur (IV) containing material content, and the measured sulfite content is within the range of 95% to 100% of the critical sulfite content by reducing the frequency of the oxidation fan 1 or reducing the number of operating fans.

Example two

The sulfite content found in this example is greater than the critical sulfite content.

The measured sulfite content is in the interval of 95-100% of the critical sulfite content by increasing the frequency of the oxidation fan 1 or increasing the number of running fans.

EXAMPLE III

In this example, the measured sulfite content is 95% to 100% of the critical sulfite content.

The frequency or the number of running machines of the oxidation fan 1 is kept unchanged, so that the measured sulfite content is stabilized in the range of 95-100% of the critical sulfite content.

The applicant states that the present invention provides an apparatus and a method for controlling the oxidation process of a wet desulfurization slurry in real time through the above embodiments, but the present invention is not limited to the above embodiments, i.e., it does not mean that the present invention must be implemented by the above embodiments. It will be apparent to those skilled in the art that any modifications of the present invention are within the scope and disclosure of the present invention.