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CN113624813A - A device and method for real-time control of wet desulfurization slurry oxidation process - Google Patents

A device and method for real-time control of wet desulfurization slurry oxidation process Download PDF

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CN113624813A
CN113624813A CN202111007799.3A CN202111007799A CN113624813A CN 113624813 A CN113624813 A CN 113624813A CN 202111007799 A CN202111007799 A CN 202111007799A CN 113624813 A CN113624813 A CN 113624813A
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sulfite
hydrocyclone
content
real
oxidation process
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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
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Xian Thermal Power Research Institute Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
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    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/346—Controlling the process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
    • B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/73—After-treatment of removed components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/80—Semi-solid phase processes, i.e. by using slurries
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D11/00—Control of flow ratio
    • G05D11/02—Controlling ratio of two or more flows of fluid or fluent material
    • G05D11/13—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means

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Abstract

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.

Description

Device and method for controlling oxidation process of wet desulphurization slurry in real time
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.

Claims (9)

1.一种湿法脱硫浆液氧化过程实时控制的装置，其特征在于，包括控制系统(2)、水力旋流器(7)、亚硫酸盐测试箱(3)、滤液池(8)及若干氧化风机(1)，其中，石膏浆液母管(4)的取样口与水力旋流器(7)的入口相连通，水力旋流器(7)的顶部出口与亚硫酸盐测试箱(3)的入口相连通，亚硫酸盐测试箱(3)的出口与滤液池(8)的入口相连通，亚硫酸盐测试箱(3)的输出端与控制系统(2)的输入端相连接，控制系统(2)的输出端与各氧化风机(1)的控制端相连接。1. a device for real-time control of wet desulfurization slurry oxidation process, is characterized in that, comprises control system (2), hydrocyclone (7), sulfite test box (3), filtrate pool (8) and several Oxidation blower (1), wherein the sampling port of the gypsum slurry mother pipe (4) is communicated with the inlet of the hydrocyclone (7), and the top outlet of the hydrocyclone (7) is connected to the sulfite test box (3) The inlet of the sulfite test box (3) is communicated with the inlet of the filtrate pool (8), the output end of the sulfite test box (3) is connected with the input end of the control system (2), and the control The output end of the system (2) is connected with the control end of each oxidation fan (1). 2.根据权利要求1所述的湿法脱硫浆液氧化过程实时控制的装置，其特征在于，石膏浆液母管(4)的取样口经泵(6)与水力旋流器(7)的入口相连通。2. the device of real-time control of wet desulfurization slurry oxidation process according to claim 1, is characterized in that, the sampling port of gypsum slurry mother pipe (4) is connected with the inlet of hydrocyclone (7) through pump (6) Pass. 3.根据权利要求1所述的湿法脱硫浆液氧化过程实时控制的装置，其特征在于，水力旋流器(7)的底部出口与真空皮带机(5)的入口相连通。3. The device for real-time control of wet desulfurization slurry oxidation process according to claim 1, wherein the bottom outlet of the hydrocyclone (7) is communicated with the inlet of the vacuum belt conveyor (5). 4.一种湿法脱硫浆液氧化过程实时控制的方法，其特征在于，基于权利要求3所述的湿法脱硫浆液氧化过程实时控制的装置，包括以下步骤：4. a method for real-time control of wet desulfurization slurry oxidation process, characterized in that, based on the device for real-time control of wet desulfurization slurry oxidation process according to claim 3, comprising the following steps: 石膏浆液母管(4)输出的浆液送入水力旋流器(7)中进行固液分离，其中，分离出来的上清液进入到亚硫酸盐测试箱(3)中，亚硫酸盐测试箱(3)的溢流浆液送入到滤液池(8)中，水力旋流器(7)分离出来的固相进入到真空皮带机(5)中。亚硫酸盐测试箱(3)将测量信号发送至控制系统(2)中，由控制系统(2)计算上清液的亚硫酸盐含量，并计算上清液的亚硫酸盐含量与临界亚硫酸盐含量之间的偏差，然后根据所述偏差控制各氧化风机(1)，使得上清液的亚硫酸盐含量与临界亚硫酸盐含量之间的偏差在预设范围内。The slurry output from the gypsum slurry mother pipe (4) is sent to the hydrocyclone (7) for solid-liquid separation, wherein the separated supernatant enters the sulfite test box (3), and the sulfite test box The overflow slurry of (3) is sent to the filtrate tank (8), and the solid phase separated by the hydrocyclone (7) enters the vacuum belt conveyor (5). The sulfite test box (3) sends the measurement signal to the control system (2), and the control system (2) calculates the sulfite content of the supernatant, and calculates the sulfite content of the supernatant and the critical sulfite The deviation between the salt contents is then controlled according to the deviation of each oxidizing fan (1), so that the deviation between the sulfite content of the supernatant and the critical sulfite content is within a preset range. 5.根据权利要求4所述的湿法脱硫浆液氧化过程实时控制的方法，其特征在于，所述亚硫酸盐测试箱(3)包括箱体以及设置于箱体上的氧化还原电极、钙离子在线测试仪、PH计、溶氧仪及温度计，通过氧化还原电极、钙离子在线测试仪、PH计、溶氧仪及温度计分别检测氧化还原电位、Ca2+浓度、H+浓度、O2浓度及温度信号，然后送入控制系统(2)中，控制系统(2)根据氧化还原电位、Ca2+浓度、H+浓度、O2浓度及温度信号计算上清液的亚硫酸盐含量。5. The method for real-time control of wet desulfurization slurry oxidation process according to claim 4, wherein the sulfite test box (3) comprises a box and redox electrodes, calcium ions arranged on the box Online tester, PH meter, dissolved oxygen meter and thermometer, through redox electrode, calcium ion online tester, pH meter, dissolved oxygen meter and thermometer to detect redox potential, Ca 2+ concentration, H + concentration, O 2 concentration respectively and temperature signal, and then sent to control system (2), control system (2) calculates the sulfite content of supernatant according to redox potential, Ca2 + concentration, H + concentration, O2 concentration and temperature signal. 6.根据权利要求5所述的湿法脱硫浆液氧化过程实时控制的方法，其特征在于，所述箱体包括长条形长方体槽以及固定于长条形长方体槽顶部开口处的带孔盖板，其中，氧化还原电极、钙离子在线测试仪、PH计、溶氧仪及温度计均插入于带孔盖板上的通孔内。6 . The method for real-time control of wet desulfurization slurry oxidation process according to claim 5 , wherein the box body comprises an elongated cuboid groove and a perforated cover plate fixed at the top opening of the elongated cuboid groove. 7 . , wherein the redox electrode, the calcium ion online tester, the pH meter, the dissolved oxygen meter and the thermometer are all inserted into the through holes on the perforated cover plate. 7.根据权利要求4所述的湿法脱硫浆液氧化过程实时控制的方法，其特征在于，还包括确定临界亚硫酸盐含量。7 . The method for real-time control of the wet desulfurization slurry oxidation process according to claim 4 , further comprising determining a critical sulfite content. 8 . 8.根据权利要求4所述的湿法脱硫浆液氧化过程实时控制的方法，其特征在于，确定临界亚硫酸盐含量的过程为：8. the method for real-time control of wet desulfurization slurry oxidation process according to claim 4, is characterized in that, the process of determining critical sulfite content is: 1)获取水力旋流器(7)底部排出的固相，经过滤得石膏固体，通过去离子水冲洗石膏固体，直至滤液为中性，然后在45℃下烘干，得石膏样品；1) obtain the solid phase discharged from the bottom of the hydrocyclone (7), filter to obtain gypsum solid, rinse the gypsum solid with deionized water until the filtrate is neutral, then dry at 45 ° C to obtain a gypsum sample; 2)利用碘量法测定石膏样品中亚硫酸钙的含量；2) utilize iodometry to measure the content of calcium sulfite in the gypsum sample; 3)在不同运行工况下，以石膏样品中亚硫酸钙的含量为横坐标，以水力旋流器(7)溢流的亚硫酸盐含量为纵坐标，绘制对照图；3) under different operating conditions, take the content of calcium sulfite in the gypsum sample as the abscissa, and take the sulfite content of the overflow of the hydrocyclone (7) as the ordinate, and draw a comparison chart; 4)根据对石膏中所含亚硫酸钙含量的要求，由对照图获得对应的水力旋流器(7)溢流的亚硫酸盐含量，并将水力旋流器(7)溢流的亚硫酸盐含量作为临界亚硫酸盐含量。4) according to the requirement to the calcium sulfite content contained in the gypsum, obtain the sulfite content of the overflow of the corresponding hydrocyclone (7) by the contrast diagram, and the sulfite that the hydrocyclone (7) overflows The salt content serves as the critical sulfite content. 9.根据权利要求4所述的湿法脱硫浆液氧化过程实时控制的方法，其特征在于，控制系统(2)根据所述偏差控制氧化风机(1)的数目及频率。9 . The method for real-time control of the wet desulfurization slurry oxidation process according to claim 4 , wherein the control system ( 2 ) controls the number and frequency of the oxidation fans ( 1 ) according to the deviation. 10 .
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