CN118112172A - Online monitoring system for sulfite in absorber slurry for reducing desulfurization energy consumption - Google Patents
Online monitoring system for sulfite in absorber slurry for reducing desulfurization energy consumption Download PDFInfo
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- CN118112172A CN118112172A CN202410530077.3A CN202410530077A CN118112172A CN 118112172 A CN118112172 A CN 118112172A CN 202410530077 A CN202410530077 A CN 202410530077A CN 118112172 A CN118112172 A CN 118112172A
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
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- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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- G—PHYSICS
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- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
- G01N27/4166—Systems measuring a particular property of an electrolyte
- G01N27/4168—Oxidation-reduction potential, e.g. for chlorination of water
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Abstract
本发明涉及湿法脱硫节能技术领域，具体为一种用于降低脱硫能耗的吸收塔浆液亚硫酸盐在线监测系统，包括，PLC控制器、浆液蠕动泵、反应器、精密滴定泵、搅拌器、热电偶、ORP氧化还原电极、除盐水桶、电极保护液桶、除盐水泵、电极保护液计量泵、排出泵以及药剂桶，药剂桶内盛放有配置好的亚硫酸钠标准溶液；本发明只加入亚硫酸钠标准溶液，采用重复滴加亚硫酸钠标准溶液，记录ORP值的变化，再经过多次测量拟合计算出亚硫酸盐浓度；可有效避免pH等其他因素对ORP的影响，直接精确测量浆液中亚硫酸盐含量；为实现氧化风量精确调节，脱硫系统安全节能运行与自动控制智慧化调节提供了数据支持；结构简单，操作方便，实用性极强。
The invention relates to the technical field of wet desulfurization energy saving, and specifically to an absorption tower slurry sulfite online monitoring system for reducing desulfurization energy consumption, comprising a PLC controller, a slurry peristaltic pump, a reactor, a precision titration pump, a stirrer, a thermocouple, an ORP redox electrode, a desalted water barrel, an electrode protection liquid barrel, a desalted water pump, an electrode protection liquid metering pump, a discharge pump and a reagent barrel, wherein a configured sodium sulfite standard solution is contained in the reagent barrel; the invention only adds the sodium sulfite standard solution, repeatedly drips the sodium sulfite standard solution, records the change of the ORP value, and then calculates the sulfite concentration through multiple measurements and fitting; the influence of other factors such as pH on the ORP can be effectively avoided, and the sulfite content in the slurry can be directly and accurately measured; data support is provided for realizing accurate regulation of oxidation air volume, safe and energy-saving operation of the desulfurization system and automatic control intelligent regulation; the structure is simple, the operation is convenient, and the practicability is extremely strong.
Description
Technical Field
The invention relates to the technical field of wet desulfurization energy conservation, in particular to an online monitoring system for sulfite of slurry in an absorption tower, which is used for reducing desulfurization energy consumption.
Background
The sulfite online monitoring is a technology for measuring the sulfite content in the slurry of the absorption tower in real time, and the technology can be used for grasping the oxidation degree of the slurry of the absorption tower in real time, accurately guiding the adjustment of the oxidation air quantity, and being beneficial to realizing safe and energy-saving operation and automatic control of a desulfurization system. At present, an ORP method is mainly adopted for online evaluation of the oxidation process, and the control thinking is as follows: in the complete oxidation state, measuring ORP in the slurry, comparing the value with the ORP of the actual slurry, and controlling the speed of oxidation wind in the slurry based on the difference value of the ORP and the ORP, so as to grasp the oxidation progress in the slurry; the method can only reflect the relative degree of the oxidizing property or the reducing property of the slurry, cannot completely show the concentration of a certain oxide or reducing substance in the slurry, is difficult to realize accurate and systematic regulation and control of the oxidizing degree by using the single index because the ORP index is related to a plurality of factors such as the PH value, the valence state of metal ions and the like in the slurry environment of the absorption tower with complex components.
In the device and the method for online detection of the sulfite content of wet desulfurization slurry in the prior patent CN113607879A, sulfite in a sample is oxidized by titration of excessive iodine solution in the slurry sample, and then residual iodine is titrated by sodium thiosulfate solution, so that the sulfite concentration in the sample is calculated, the process is complex, the reaction time is long, and the required medicine types are various.
Disclosure of Invention
Aiming at the problems, the embodiment of the invention provides an online monitoring system for sulfite of slurry in an absorption tower, which is used for reducing desulfurization energy consumption.
The embodiment of the invention provides an online monitoring system for slurry sulfite of an absorption tower for reducing desulfurization energy consumption, which comprises a PLC (programmable logic controller), a slurry peristaltic pump, a reactor, a precision titration pump, a stirrer, a thermocouple, an ORP redox electrode, a desalting water bucket, an electrode protection liquid bucket, a desalting water pump, an electrode protection liquid metering pump, a discharge pump and a medicament bucket, wherein a configured sodium sulfite standard solution is contained in the medicament bucket;
The PLC is electrically connected with the slurry peristaltic pump, the precision titration pump, the stirrer, the thermocouple, the ORP redox electrode, the desalting water pump, the electrode protection liquid metering pump and the discharge pump;
The inlet end of the slurry peristaltic pump is connected with the slurry pipeline, and the outlet end of the slurry peristaltic pump is discharged to the reactor; the stirrer, the thermocouple and the ORP redox electrode are arranged in the reactor; the inlet end of the precise titration pump is connected with the medicament barrel, and the outlet end of the precise titration pump is discharged to the reactor; the inlet end of the discharge pump is connected with the bottom of the reactor, and the outlet end of the discharge pump is discharged to the outside of the system; the inlet end of the desalting water pump is connected with the desalting water bucket, and the outlet end of the desalting water pump is discharged to the reactor; the inlet end of the electrode protection liquid metering pump is connected with the electrode protection liquid barrel, and the outlet end of the electrode protection liquid metering pump is discharged to the reactor;
The PLC controller takes quantitative slurry from a slurry pipeline to the reactor through a slurry peristaltic pump, measures the temperature of the slurry through a thermocouple, starts a stirrer, simultaneously adds quantitative sodium sulfite standard solution into the reactor for a plurality of times through a precision titration pump, and records corresponding potential values after the values of the ORP redox electrode are stabilized after each addition;
The PLC controller calculates the sulfite content in the slurry by utilizing the temperature, the potential value, the slurry volume, the volume of the added sodium sulfite standard solution and the concentration of the sodium sulfite standard solution through multiple measurement and fitting.
Compared with the prior art, the invention has the beneficial effects that: the sodium sulfite standard solution is added for multiple times, the potential value is measured for multiple times, fitting calculation is carried out, the sodium sulfite content in the slurry to be measured is obtained, the influence of other factors such as pH and the like on ORP can be effectively avoided, and the sulfite content in the slurry is directly and accurately measured; the data support is provided for realizing the precise adjustment of the oxidation air quantity, the safe and energy-saving operation and the automatic control and intelligent adjustment of the desulfurization system; simple structure, convenient operation, the practicality is extremely strong.
Optionally, the step of calculating the sulfite content in the slurry further comprises: the PLC controller discharges waste liquid in the reactor through the discharge pump, and the desalting water is filled into the reactor through the desalting water pump for cleaning, and electrode protection liquid is added into the reactor through the electrode protection liquid metering pump after cleaning.
Alternatively, the solubility of the sodium sulfite standard solution is 0.05-1mol/L.
Alternatively, the volume of sodium sulfite standard solution added each time is 0.1-100mL.
Optionally, the sodium sulfite standard solution is added no less than 5 times.
Optionally, the PLC controller calculates the sulfite content in the slurry by measuring the temperature, the potential value, the slurry volume, the volume of the added sodium sulfite standard solution and the concentration of the sodium sulfite standard solution a plurality of times, and the process of calculating the sulfite content in the slurry by combining the measurements comprises:
Establishing a relation: ；
The conversion is carried out to obtain: Wherein, the method comprises the steps of, wherein, The value of the electric potential is represented,Indicating the concentration of sodium sulfite in the slurry,The volume of the slurry is indicated as such,The concentration of the added sodium sulfite standard solution is shown,Indicating that the volume of the sodium sulfite standard solution has been added,Indicating a slope of，The temperature is indicated as a function of the temperature,、、All of which represent a constant value,Indicating the ideal gas constant of the gas,Representing the Faraday constant;
the volume of the sodium sulfite standard solution added is recorded as x, and the standard solution of sodium sulfite added each time is calculated Marking as y, and fitting a curve by using a plurality of calculation results;
Based on the obtained curve DeterminingI.e.And then obtain。
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate and together with the description serve to explain the application. In the drawings:
Fig. 1 is a schematic structural diagram of an online monitoring system for sulfite of slurry in an absorption tower for reducing desulfurization energy consumption according to an embodiment of the present invention.
Wherein, PLC controller 1, thick liquid peristaltic pump 2, reactor 3, accurate titration pump 4, agitator 5, thermocouple 6, ORP redox electrode 7, desalination cask 8, electrode protection liquid bucket 9, desalination water pump 10, electrode protection liquid metering pump 11, discharge pump 12, medicament bucket 13.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments and the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent. The exemplary embodiments of the present invention and the descriptions thereof are used herein to explain the present invention, but are not intended to limit the invention.
Referring to fig. 1, the online monitoring system for sulfite of absorption tower slurry for reducing desulfurization energy consumption provided by the embodiment of the invention comprises a PLC controller 1, a slurry peristaltic pump 2, a reactor 3, a precision titration pump 4, a stirrer 5, a thermocouple 6, an ORP redox electrode 7, a desalting bucket 8, an electrode protection liquid bucket 9, a desalting pump 10, an electrode protection liquid metering pump 11, a discharge pump 12 and a medicament bucket 13, wherein a configured sodium sulfite standard solution is contained in the medicament bucket 13;
the PLC controller 1 is electrically connected with a slurry peristaltic pump 2, a precision titration pump 4, a stirrer 5, a thermocouple 6, an ORP redox electrode 7, a desalted water pump 10, an electrode protection liquid metering pump 11 and a discharge pump 12;
The inlet end of the slurry peristaltic pump 2 is connected with a slurry pipeline, and the outlet end of the slurry peristaltic pump is discharged to the reactor 3; an agitator 5, a thermocouple 6 and an ORP redox electrode 7 are placed in the reactor 3; the inlet end of the precise titration pump 4 is connected with the medicament barrel 13, and the outlet end is discharged to the reactor 3; the inlet end of the discharge pump 12 is connected with the bottom of the reactor 3, and the outlet end is discharged to the outside of the system; the inlet end of the desalting water pump 10 is connected with the desalting water bucket 8, and the outlet end of the desalting water pump is discharged to the reactor 3; the inlet end of the electrode protection liquid metering pump 11 is connected with the electrode protection liquid barrel 9, and the outlet end is discharged to the reactor 3;
The PLC 1 takes quantitative slurry from a slurry pipeline to the reactor 3 through a slurry peristaltic pump 2, measures the temperature of the slurry through a thermocouple 6, starts a stirrer 5, simultaneously adds quantitative sodium sulfite standard solution into the reactor 3 for a plurality of times through a precision titration pump 4, and records corresponding potential values after each addition and the value of an ORP redox electrode 7 is stable;
The PLC controller 1 calculates the sulfite content in the slurry by utilizing the temperature, the potential value, the slurry volume, the volume of the added sodium sulfite standard solution and the concentration of the sodium sulfite standard solution through multiple measurement and fitting.
In practice, the method for calculating the sulfite content in the slurry further comprises the following steps: the PLC controller 1 discharges the waste liquid in the reactor 3 through a discharge pump 12, and the desalting water pump 10 is used for flushing the desalting water into the reactor 3 for cleaning, and after the cleaning is finished, the electrode protection liquid is added into the reactor 3 through the electrode protection liquid metering pump 11 to soak the ORP redox electrode 7.
The solubility of the sodium sulfite standard solution is 0.05-1mol/L.
The volume of the sodium sulfite standard solution added each time is 0.1-100mL.
The number of times of adding sodium sulfite standard solution is not less than 5 times.
The process of calculating the sulfite content in the slurry by the PLC controller 1 through combination of multiple measurement by using the temperature, the potential value, the slurry volume, the volume of the added sodium sulfite standard solution and the concentration of the sodium sulfite standard solution comprises the following steps:
Establishing a relation: ；
The conversion is carried out to obtain: Wherein, the method comprises the steps of, wherein, The value of the electric potential is represented,Indicating the concentration of sodium sulfite in the slurry,The volume of the slurry is indicated as such,The concentration of the added sodium sulfite standard solution is shown,Indicating that the volume of the sodium sulfite standard solution has been added,Indicating a slope of，The temperature is indicated as a function of the temperature,、、All of which represent a constant value,Indicating the ideal gas constant of the gas,Representing the Faraday constant;
the volume of the sodium sulfite standard solution added is recorded as x, and the standard solution of sodium sulfite added each time is calculated Marking as y, and fitting a curve by using a plurality of calculation results;
Based on the obtained curve DeterminingI.e.And then obtain。
Connecting pipelines among the devices are polytetrafluoroethylene tubes. After the sulfite content in the slurry is calculated, the PLC controller 1 can control the oxidation air quantity according to the sulfite content in the slurry, and if the sulfite content in the slurry is lower than a set value, the number of the operation fans or the operation frequency of the oxidation fans is reduced to reduce the amount of the oxidation air finally entering the absorption tower; when the sulfite content in the slurry is higher than a set value, the number of the oxidation fans or the operation frequency of the oxidation fans is increased to increase the amount of the oxidation air finally entering the absorption tower.
Taking slurry in an absorption tower of a coal-fired power plant as an example: 3 oxidation fans are arranged in the absorption tower, each flow is 2500m 3/h, and two oxidation fans are operated at present; a slurry peristaltic pump extracts 10mL of slurry from a slurry pipeline, the slurry is added into the reactor, a precise titration pump drops 10mL of sodium sulfite standard solution into the reactor, stirring is carried out, ORP value and temperature are measured, and the ORP value and the temperature are recorded in a PLC; the sodium sulfite standard solution was repeatedly added dropwise, and the corresponding ORP value was recorded after each addition was completed. The ORP values were 340mV, 330mV, 315mV, 290mV and 220mV, respectively, after 5 drops. The sulfite concentration in the original slurry is 4.79mol/L, namely 422mg/L, through fitting calculation. The sulfite content in the original slurry is lower than 500mg/L and is at a lower level, and the PLC controller sends out instructions to adjust the number of the operation fans from 2 to 1, so that the energy consumption of an oxidation air system is reduced.
The sulfite standard solutions with different concentrations were tested by the present invention and the iodometry (the method disclosed in the prior patent CN113607879a listed in the background art), respectively, and the results are shown in the following table:
| Project | Unit (B) | Number 1 | Number 2 | Numerical value 3 | Number 4 | Number 5 |
| Standard sulfite solution concentration | mg/L | 50.33 | 100.52 | 199.67 | 499.64 | 1000.41 |
| Iodine method | mg/L | 47.61 | 98.48 | 193.19 | 479.58 | 986.27 |
| The invention is that | mg/L | 51.46 | 96.77 | 194.42 | 511.93 | 1033.62 |
Compared with the prior art of adding iodine solution and sodium thiosulfate solution, the scheme provided by the invention has the advantages that only sodium sulfite standard solution is added, repeated dropwise addition of sodium sulfite standard solution is adopted, the change of ORP value is recorded, and the sulfite concentration is calculated through repeated measurement and fitting; compared with an iodometric method, the method has the advantages that the test result is closer, the used medicament is more single, the measurement process is simpler, the production cost is lower, the operation cost generated by continuous monitoring on 1 unit of the thermal power plant through actual detection and statistics is about 4 ten thousand yuan per year, the annual cost of the iodometric method is about 1.5 ten thousand yuan per year, and the annual cost is saved by 2.5 ten thousand yuan per year; compared with other ORP methods, the method can effectively avoid the influence of other factors such as pH and the like on ORP, and directly and accurately measure the sulfite content in the slurry; the data support is provided for realizing the precise adjustment of the oxidation air quantity, the safe and energy-saving operation and the automatic control and intelligent adjustment of the desulfurization system; simple structure, convenient operation, the practicality is extremely strong.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Claims (6)
1. The online monitoring system for the sulfite of the absorption tower for reducing the desulfurization energy consumption is characterized by comprising a PLC (programmable logic controller), a slurry peristaltic pump, a reactor, a precision titration pump, a stirrer, a thermocouple, an ORP redox electrode, a desalting water bucket, an electrode protection liquid bucket, a desalting water pump, an electrode protection liquid metering pump, a discharge pump and a medicament bucket, wherein the medicament bucket is filled with a configured sodium sulfite standard solution;
The PLC is electrically connected with the slurry peristaltic pump, the precision titration pump, the stirrer, the thermocouple, the ORP redox electrode, the desalting water pump, the electrode protection liquid metering pump and the discharge pump;
The inlet end of the slurry peristaltic pump is connected with the slurry pipeline, and the outlet end of the slurry peristaltic pump is discharged to the reactor; the stirrer, the thermocouple and the ORP redox electrode are arranged in the reactor; the inlet end of the precise titration pump is connected with the medicament barrel, and the outlet end of the precise titration pump is discharged to the reactor; the inlet end of the discharge pump is connected with the bottom of the reactor, and the outlet end of the discharge pump is discharged to the outside of the system; the inlet end of the desalting water pump is connected with the desalting water bucket, and the outlet end of the desalting water pump is discharged to the reactor; the inlet end of the electrode protection liquid metering pump is connected with the electrode protection liquid barrel, and the outlet end of the electrode protection liquid metering pump is discharged to the reactor;
The PLC controller takes quantitative slurry from a slurry pipeline to the reactor through a slurry peristaltic pump, measures the temperature of the slurry through a thermocouple, starts a stirrer, simultaneously adds quantitative sodium sulfite standard solution into the reactor for a plurality of times through a precision titration pump, and records corresponding potential values after the values of the ORP redox electrode are stabilized after each addition;
The PLC controller calculates the sulfite content in the slurry by utilizing the temperature, the potential value, the slurry volume, the volume of the added sodium sulfite standard solution and the concentration of the sodium sulfite standard solution through multiple measurement and fitting.
2. The on-line monitoring system for sulfite of an absorber slurry for reducing desulfurization energy consumption of claim 1, further comprising after calculating the sulfite content of the slurry: the PLC controller discharges waste liquid in the reactor through the discharge pump, and the desalting water is filled into the reactor through the desalting water pump for cleaning, and electrode protection liquid is added into the reactor through the electrode protection liquid metering pump after cleaning.
3. The on-line monitoring system for sulfite of absorption tower slurry for reducing desulfurization energy consumption of claim 1, wherein the solubility of sodium sulfite standard solution is 0.05-1mol/L.
4. The on-line monitoring system for sulfite of an absorber slurry for reducing desulfurization energy consumption of claim 1, wherein the volume of the sodium sulfite standard solution added each time is 0.1-100mL.
5. The on-line monitoring system for sulfite of an absorber slurry for reducing desulfurization energy consumption of claim 1, wherein the number of times of adding sodium sulfite standard solution is not less than 5 times.
6. The on-line monitoring system for sulfite of absorption tower slurry for reducing desulfurization energy consumption of claim 1, wherein the PLC controller calculates sulfite content in the slurry by using temperature, potential value, slurry volume, added sodium sulfite standard solution volume and sodium sulfite standard solution concentration, and a plurality of measurements are combined, comprising:
Establishing a relation: ；
The conversion is carried out to obtain: Wherein/> Representing the potential value,Represents the sodium sulfite concentration in the slurry,Representing slurry volume,Represents the concentration of the sodium sulfite standard solution added,Represents the volume of the sodium sulfite standard solution added/(Indicating slope as，Representing temperature,、、All represent constants,Representing the ideal gas constant,Representing the Faraday constant;
the volume of the sodium sulfite standard solution added is recorded as x, and the standard solution of sodium sulfite added each time is calculated Marking as y, and fitting a curve by using a plurality of calculation results;
Based on the obtained curve DetermineI.e.And then obtain。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN119936304A (en) * | 2025-04-02 | 2025-05-06 | 上海朴维自控科技有限公司 | An online analyzer for sulfite in electroplating gold bath |
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| CN119936304A (en) * | 2025-04-02 | 2025-05-06 | 上海朴维自控科技有限公司 | An online analyzer for sulfite in electroplating gold bath |
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