CN113567507A - System and method for online monitoring of concentration of sulfite ions in desulfurization slurry - Google Patents
System and method for online monitoring of concentration of sulfite ions in desulfurization slurry Download PDFInfo
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Abstract
The invention relates to the technical field of on-line monitoring of sulfite ion concentration, in particular to an on-line monitoring system and method for sulfite ion concentration in desulfurization slurry. The system comprises a desulfurization slurry tower, a liquid storage device, a scale liquid collecting pipe and a control system; a sulfite ion electrode is arranged in the liquid storage device, one side of the liquid storage device is communicated with a slurry pool of the desulfurization slurry tower, and the other side of the liquid storage device is communicated with a scale liquid collecting pipe through a liquid overflow port; scales are arranged on the pipe wall of the scale liquid collecting pipe, a liquid level meter is further arranged in the scale liquid collecting pipe, and the scale liquid collecting pipe is connected with an electromagnetic pulse pump and a liquid injection pump; the data input end of the control system is respectively connected with the sulfite ion electrode and the liquid level meter, and the output control end of the control system is connected with the electromagnetic pulse pump and the liquid injection pump. The device has the advantages of simple structure, reasonable design and high measurement accuracy, and can provide real-time concentration of sulfite ions in the desulfurization slurry pool for a thermal power plant.
Description
Technical Field
The invention relates to the technical field of on-line monitoring of sulfite ion concentration, in particular to an on-line monitoring system and method for sulfite ion concentration in desulfurization slurry.
Background
The limestone-gypsum wet desulphurization process has a series of advantages of high reaction speed, high desulphurization efficiency, mature process, reliable operation and the like. The desulfurization process is the most widely applied desulfurization method in the current thermal power plant. The core of the process is as follows: limestone (the main component is CaCO) in slurry of the flue gas absorption tower3) Washing, SO in washing process2The gas is removed to obtain calcium sulfite, and the calcium sulfite is oxidized by oxygen and air to obtain byproduct gypsum (CaSO)4·2H2O) crystals. The chemical reaction equation is as follows:
CaCO3+H2O+2SO2→Ca(HSO3)2+CO2(1)SO2absorption of
Ca(HSO3)2+O2+2H2O→CaSO4·2H2O+H2SO4(2) Oxidation of slurries
The reaction is a continuous and complicated working condition, and the oxidation control of the desulfurization slurry is a great technical problem of a desulfurization system and a desulfurization method. At present, forced oxidation is mostly adopted in thermal power plants to aerate the desulfurization slurry so as to convert sulfite into sulfate, and the byproduct gypsum is obtained through dehydration. The content of sulfite can reflect the oxidation degree of the desulfurization slurry to a certain extent, at present, no system and method for monitoring the concentration of sulfite ions in the desulfurization slurry on line exist in the industry, the oxidation of the desulfurization slurry in the desulfurization tower is all dependent on experience, the oxidation condition of the sulfuric acid slurry in the tower cannot be truly reflected, and the under-oxidation condition is caused to occur frequently. The occurrence of under-oxidation is easily caused as followsAnd (3) harming: 1) the system and the method have serious scaling due to overhigh content of sulfite, so that the safe operation of the system and the method is endangered; 2) insufficient oxidation results in the generation of thiosulfate and increases COD of the slurry, sulfite has oxidation and reduction and is a water pollutant, and SO is released after decomposition2Returning to the flue gas again to reduce the desulfurization efficiency; 3) the sulfite in the gypsum slurry exceeds the standard, qualified gypsum crystals cannot be generated, the particle size of calcium sulfite is small, the gypsum is difficult to dehydrate, and the quality of the gypsum is reduced; 4) the high concentration of sulfite coats the limestone particles preventing their dissolution, causing limestone occlusion, resulting in a decrease in desulfurization efficiency.
Therefore, the control on the concentration of the sulfite ions in the desulfurization slurry is very important, but the current measuring equipment or method has the problems that the measuring result is not accurate, the oxidation condition in the reaction tower cannot be reflected on line in real time, and the like.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the system and the method for monitoring the concentration of sulfite ions in the desulfurized slurry on line, which have the advantages of simple structure, reasonable design and high measurement accuracy, and can provide the real-time concentration of sulfite ions in the desulfurized slurry pool for a thermal power plant.
The invention is realized by the following technical scheme:
an online monitoring system for the concentration of sulfite ions in desulfurization slurry comprises a desulfurization slurry tower, a liquid storage device, a scale liquid collecting pipe and a control system;
a sulfite ion electrode is arranged in the liquid storage device, one side of the liquid storage device is communicated with a slurry pool of the desulfurization slurry tower, and the other side of the liquid storage device is communicated with a scale liquid collecting pipe through a liquid overflow port; scales are arranged on the pipe wall of the scale liquid collecting pipe, a liquid level meter is further arranged in the scale liquid collecting pipe, and the scale liquid collecting pipe is connected with an electromagnetic pulse pump and a liquid injection pump;
the data input end of the control system is respectively connected with the sulfite ion electrode and the liquid level meter, and the output control end of the control system is connected with the electromagnetic pulse pump and the liquid injection pump.
Further, a stirring device is also arranged in the liquid storage device.
Furthermore, the scale liquid collecting pipe is connected with a waste liquid barrel through an electromagnetic pulse pump.
Further, the electromagnetic pulse pump adopts a peristaltic pump.
Furthermore, the liquid level meter adopts any one of an infrared optical liquid level meter, a magnetic turnover liquid level meter, a magnetic floating ball liquid level meter, an explosion-proof floating ball liquid level meter, a glass plate type liquid level meter, a glass tube type liquid level meter, a steel belt liquid level meter, a heavy hammer detection liquid level meter, an ultrasonic wave liquid level meter or a radar liquid level meter.
Further, the sulfite ion electrode is any one of a fluorescent probe type electrode, a triphenylamine dye type electrode or an imidazopyridine indole type electrode.
Furthermore, a liquid pump and a filter are sequentially arranged on a pipeline communicated with the liquid storage device and the desulfurization slurry tower.
Further, the liquid pump adopts a peristaltic pump.
Further, the control system adopts a PLC controller.
An on-line monitoring method for the concentration of sulfite ions in desulfurization slurry comprises,
extracting slurry from a slurry pool of the desulfurization slurry tower into a liquid storage device, enabling redundant extraction liquid to flow into a scale liquid collecting pipe from a liquid overflow port of the liquid storage device, and simultaneously injecting distilled water with the volume of V into the scale liquid collecting pipe through a liquid injection pump; testing the sulphite ion content C of the liquid contained in the reservoir by means of a sulphite ion electrode0The liquid volume V of the scale liquid collecting pipe is obtained through the side of the liquid level meter0And will V1、V0And C0Transmitting to a control system;
when the liquid level height of the liquid in the scale liquid collecting pipe is higher than a first liquid level height threshold value, the control system starts the electromagnetic pulse pump to pump the liquid in the scale liquid collecting pipe, when the liquid level height of the liquid in the scale liquid collecting pipe is equal to a second liquid level height threshold value, the electromagnetic pulse pump stops, the electromagnetic pulse pump transmits a pulse signal comprising the starting times of the pulse pump and the single pulse liquid amount to the control system, and the starting times and the single pulse amount of the pulse pump are usedThe liquid flow Q of the pulse liquid can be calculated in unit timevThe control system is based on the formula
And calculating to obtain the concentration C of the sulfite ions in the actual liquid.
Compared with the prior art, the invention has the following beneficial technical effects:
the system realizes the sampling of the slurry by communicating a liquid storage device with a liquid overflow port on a slurry pool of a desulfurization slurry tower and communicating a scale liquid collecting pipe with the liquid overflow port, meanwhile, a sulfite ion electrode is arranged in the liquid storage device, an electromagnetic pulse pump, a liquid injection pump and a liquid level meter are all arranged on the scale liquid collecting pipe, the sulfite ion electrode and the liquid level meter are connected with a data input end of a control system, and the electromagnetic pulse pump and the liquid injection pump are respectively connected with an output control end of the control system, thereby realizing the real-time online monitoring of the concentration of the sulfite ions in the desulfurization slurry, having high measuring efficiency and accurate measuring result.
Furthermore, the system of the invention enables the liquid in the liquid storage device to be more uniform by arranging the stirring device in the liquid storage device, thereby effectively improving the accuracy of the measurement result.
Furthermore, the system collects the system waste liquid by arranging the waste liquid barrel, and the waste liquid barrel does not react with the waste liquid, so that the system is high in safety, environment-friendly and economical.
Furthermore, the electromagnetic pulse pump, the liquid pump and the sulfite ion electrode adopted by the system are various in types and strong in selectivity, so that the applicability of the system is effectively ensured, and the accurate control capability of the system is improved.
Furthermore, the liquid level gauge is adopted to measure the liquid level height of the scale liquid collecting pipe, so that the system is high in accuracy, convenient, fast and efficient, wide in type selection range and small in limitation.
Furthermore, the system effectively filters the slurry entering the liquid storage device by arranging the filter, so that large solid particles are prevented from flowing into a subsequent treatment system, the safety and reliability are improved, the service life of the system is prolonged, and the accuracy of a test result is further ensured.
The method samples the slurry in a slurry pool of the desulfurization slurry tower through a liquid storage device with a built-in sulfite ion electrode, and performs online analysis on the sampling data by matching with a scale liquid collecting pipe, an electromagnetic pulse pump, a liquid injection pump and a control system, namely, the integration calculation is performed according to a liquid level meter and a first liquid level height value and a second liquid level height value of the scale liquid collecting pipe stored in the control system in advance, and finally the real-time concentration of sulfite ions in the actual liquid is measured, so that the real-time concentration of sulfite ions in the desulfurization slurry is mastered in time, the oxidation condition in the desulfurization slurry tower can be accurately reflected, the problem of inaccurate judgment by depending on experience is effectively avoided, the measuring process is timely and efficient, and the measuring result is accurate and reliable.
Drawings
Fig. 1 is a schematic structural diagram of the system according to the embodiment of the present invention.
In the figure: the method comprises the following steps of 1-a filter, 2-a liquid suction pump, 3-a sulfite ion electrode, 4-a liquid storage device, 5-a graduated liquid collecting pipe, 6-a liquid level meter, 7-an electromagnetic pulse pump, 8-a waste liquid barrel, 9-a control system, 10-a desulfurization slurry tower, 11-a liquid suction pump and 12-a stirring device.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
Example 1
The invention discloses an online monitoring system for the concentration of sulfite ions in desulfurization slurry, which comprises a filter 1, a liquid pump 2, a sulfite ion electrode 3, a liquid storage device 4, a scale liquid collecting pipe 5, a liquid level meter 6, an electromagnetic pulse pump 7, a waste liquid barrel 8, a control system 9, a desulfurization slurry tower 10, a liquid injection pump 11 and a stirring device 12, wherein the liquid pump 2 is connected with the liquid storage device through a pipeline;
the slurry pool of the desulfurization slurry tower 10 is sequentially communicated with a filter 1, a liquid pump 2, a liquid storage device 4, a scale liquid collecting pipe 5, an electromagnetic pulse pump 7 and a waste liquid barrel 8; a sulfite ion electrode 3 is arranged in the liquid storage device 4, and a liquid overflow port is arranged on the side wall; the scale liquid collecting pipe 5 is connected to the liquid overflow port, a liquid level meter 6 and a stirring device 12 are arranged in the scale liquid collecting pipe, and a liquid injection pump 11 for injecting distilled water is connected to the scale liquid collecting pipe; the sulfite ion electrode 3 and the liquid level meter 6 are connected with a data input end of the control system 6, and the electromagnetic pulse pump 7 and the liquid injection pump 11 are connected with an output control end of the control system 6; the control system 9 is internally stored with a first liquid level numerical value and a second liquid level numerical value of the scale liquid collecting pipe 5.
Preferably, the pump 2 is shown as any device capable of pumping fluid, such as a peristaltic pump;
preferably, the sulfite ion electrode 3 can be any one of electrodes capable of testing the concentration of sulfite ions in the liquid, such as any one of a fluorescent probe type electrode, a triphenylamine dye type electrode, an imidazopyridine indole type electrode, and the like;
preferably, the liquid collector 4 is a liquid storage with a liquid overflow port on one side;
preferably, the scale liquid collecting pipe 5 is a self-designed container with scales;
preferably, the liquid level meter 6 can be any one of devices capable of monitoring liquid level, including any one of an infrared optical liquid level meter, a magnetic flip liquid level meter, a magnetic floating ball liquid level meter, an explosion-proof floating ball liquid level meter, a glass plate type liquid level meter, a glass tube type liquid level meter, a steel strip liquid level meter, a heavy hammer detection liquid level meter, an ultrasonic liquid level meter or a radar liquid level meter;
preferably, the electromagnetic pulse pump 7 can be any pump capable of pumping liquid, such as a peristaltic pump;
preferably, the waste liquid barrel 8 can be any container made of a material which does not react with waste liquid;
preferably, the control system 9 is programmed by a PLC and sends an operation adjustment instruction to each component of the whole system.
In practical application, the working principle or operation process of the system of the invention is as follows,
the test system is started, the slurry pump 2 pumps slurry from the slurry tank of the desulfurization slurry tower 10, and the slurry is filtered by the filter 1 to remove large solidsThe granules flow into the liquid reservoir 4, and a certain amount of distilled water V is injected into the liquid reservoir 4 by the liquid injection pump 111Diluting, stirring uniformly by the stirring device 12, and injecting the liquid into the electromagnetic pulse pump 7 by a liquid amount V corresponding to the liquid level in the graduated liquid accumulating tube 50The data are transmitted to a control system 9, and the sulfite ion electrode 3 tests the sulfite ion content C in the liquid contained in the liquid storage device 40The measured data are transmitted to a control system 9, redundant extraction liquid flows into a scale liquid collecting pipe 5 from a liquid overflow port on one side of a liquid reservoir 4, and a liquid level meter 6 is arranged in the scale liquid collecting pipe 5 and used for indicating the liquid level height in the scale liquid collecting pipe 5; setting a first liquid level height value and a second liquid level height value in a control system 9, starting an electromagnetic pulse pump 7 to pump liquid to the second liquid level height value when the liquid level is higher than the set first liquid level height value, transmitting a pulse signal comprising the starting times of the pulse pump and the single pulse liquid quantity to the control system 9 by the electromagnetic pulse pump 7, and calculating the liquid flow Q in unit time through the starting times of the pulse pump and the single pulse liquid quantityvThe control system 9 performs an integrated calculation of the received data according to a formula
And calculating the real-time concentration C of the sulfite ions in the actual liquid.
The sodium sulfite solution having a concentration of 1.84g/L was used in this example to perform the example on the system as described in fig. 1, and as a result,
a sodium sulfite solution with the concentration of 1.84g/L is prepared in a laboratory (the concentration of sulfite ions is 1.17g/L), and an online test is carried out by adopting the method disclosed by the invention, so that the concentration of the sulfite ions in the solution is 1.14 g/L.
The system of the present invention may be used for any liquid measurement where it is desirable to measure the concentration of sulfite ions.
Based on any one of the systems, the invention also provides an online monitoring method for the concentration of sulfite ions in the desulfurization slurry, which comprises the following steps,
slurry is extracted from a slurry pool of the desulfurization slurry tower 10 to a liquid storage device 4In the middle, the redundant extraction liquid flows into the scale liquid collecting pipe 5 from the liquid overflow port of the liquid storage device 4, and simultaneously the volume V is used1The distilled water is injected into the scale liquid collecting pipe 5 through the liquid injection pump 11; the liquid contained in the reservoir 4 is tested for its sulphite ion content C by means of a sulphite ion electrode 30The liquid amount V of the scale liquid collecting pipe 5 is obtained through the side of the liquid level meter 60And will V1、V0And C0To the control system 9;
when the liquid level height of the liquid in the scale liquid collecting pipe 5 is higher than a first liquid level height threshold value, the control system 9 starts the electromagnetic pulse pump 7 to pump the liquid in the scale liquid collecting pipe 5, when the liquid level height of the liquid in the scale liquid collecting pipe 5 is equal to a second liquid level height threshold value, the electromagnetic pulse pump 7 stops transmitting pulse signals comprising the starting times of the pulse pump and the single pulse liquid amount to the control system 9, and the liquid flow Q in unit time can be calculated through the starting times of the pulse pump and the single pulse liquid amountvThe control system 9 is based on the formula
And calculating to obtain the concentration C of the sulfite ions in the actual liquid.
The method provided by the invention is used for modifying and installing the pilot test bed. The concentration of sulfite in the desulfurization slurry in the slurry pool of the test bed is 1.65g/L, the concentration of sulfite ions in the slurry pool is 1.69g/L by an off-line iodometry method, and the measurement results of the sulfite ions and the concentration of sulfite ions are similar.
The system and the method can realize real-time online monitoring of the concentration of the sulfite ions in the desulfurization slurry, have accurate measurement results, can guide a thermal power plant to adjust the amount of the oxidizing air blown into the desulfurization slurry tank according to the data result of the real-time monitoring, solve the problem caused by underoxidation of the calcium sulfite in the desulfurization slurry tank, and have important engineering application value.
Example 2
The sodium sulfite solution having a concentration of 28.82g/L was used in this example on the system as described in FIG. 1, and the results are as follows.
A sodium sulfite solution with the concentration of 28.82g/L is prepared in a laboratory (the concentration of sulfite ions is 18.30g/L), and an online test is carried out by adopting the method disclosed by the invention, so that the concentration of the sulfite ions in the solution is 18.46 g/L.
Claims (10)
1. The on-line monitoring system for the concentration of sulfite ions in the desulfurization slurry is characterized by comprising a desulfurization slurry tower (10), a liquid storage device (4), a scale liquid collecting pipe (5) and a control system (9);
a sulfite ion electrode (3) is arranged in the liquid storage device (4), one side of the liquid storage device (4) is communicated with a slurry pool of the desulfurization slurry tower (10), and the other side of the liquid storage device is communicated with a scale liquid collecting pipe (5) through a liquid overflow port; scales are arranged on the pipe wall of the scale liquid collecting pipe (5), a liquid level meter (6) is also arranged in the scale liquid collecting pipe (5), and an electromagnetic pulse pump (7) and a liquid injection pump (11) are connected to the scale liquid collecting pipe (5);
the data input end of the control system (9) is respectively connected with the sulfite ion electrode (3) and the liquid level meter (6), and the output control end is connected with the electromagnetic pulse pump (7) and the liquid injection pump (11).
2. The system for on-line monitoring of the concentration of sulfite ions in desulfurized slurry according to claim 1, wherein an agitating device (12) is further disposed in said liquid storage device (4).
3. The system for on-line monitoring of the concentration of sulfite ions in desulfurization slurry according to claim 1, wherein the graduated liquid collecting pipe (5) is connected with a waste liquid barrel (8) through an electromagnetic pulse pump (7).
4. The system for on-line monitoring of the concentration of sulfite ions in a desulfurization slurry according to claim 1, wherein the electromagnetic pulse pump (7) is a peristaltic pump.
5. The system for on-line monitoring of the concentration of sulfite ions in desulfurized slurry according to claim 1, wherein the level meter (6) is any one of an infrared optical level meter, a magnetic flip level meter, a magnetic float level meter, an explosion-proof float level meter, a glass plate level meter, a glass tube level meter, a steel strip level meter, a weight detecting level meter, an ultrasonic level meter or a radar level meter.
6. The system for on-line monitoring of the concentration of sulfite ions in desulfurization slurry according to claim 1, wherein the sulfite ion electrode (3) is any one of a fluorescent probe-type electrode, a triphenylamine dye-type electrode or an imidazopyridine indole-type electrode.
7. The system for on-line monitoring of the concentration of sulfite ions in desulfurization slurry according to claim 1, wherein a liquid pump (2) and a filter (1) are sequentially arranged on a pipeline communicating the liquid reservoir (4) with the desulfurization slurry tower (10).
8. The system for on-line monitoring of the concentration of sulfite ions in desulfurization slurry according to claim 7, wherein the liquid pump (2) is a peristaltic pump.
9. The system for on-line monitoring of the concentration of sulfite ions in desulfurization slurry according to claim 1, wherein the control system (9) adopts a PLC controller.
10. A method for on-line monitoring of sulfite ion concentration in desulfurization slurry, based on the system of any one of claims 1 to 8, comprising,
slurry is extracted from a slurry pool of the desulfurization slurry tower (10) to the liquid storage device (4), redundant extracted liquid flows into the scale liquid collecting pipe (5) from a liquid overflow port of the liquid storage device (4), and the volume V is simultaneously measured(1)The distilled water is injected into the scale liquid collecting pipe (5) through the liquid injection pump (11); the content C of the sulphite ions in the liquid contained in the liquid reservoir (4) is tested by a sulphite ion electrode (3)0A scale liquid collecting pipe (5) is arranged at the side of the liquid level meter (6)) The amount of liquid V0And will V1、V0And C0To a control system (9);
when the liquid level height of the liquid in the scale liquid collecting pipe (5) is higher than a first liquid level height threshold value, the control system (9) starts the electromagnetic pulse pump (7) to pump the liquid in the scale liquid collecting pipe (5), when the liquid level height of the liquid in the scale liquid collecting pipe (5) is equal to a second liquid level height threshold value, the electromagnetic pulse pump (7) stops transmitting a pulse signal comprising the starting times of the pulse pump and the single pulse liquid amount to the control system (9), and the liquid flow rate Q in unit time can be calculated through the starting times of the pulse pump and the single pulse liquid amountvThe control system (9) is based on the formula
And calculating to obtain the concentration C of the sulfite ions in the actual liquid.
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| CN115121099A (en) * | 2022-07-14 | 2022-09-30 | 西安热工研究院有限公司 | Integrated online control desulfurization slurry oxidation and wastewater discharge device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115121099A (en) * | 2022-07-14 | 2022-09-30 | 西安热工研究院有限公司 | Integrated online control desulfurization slurry oxidation and wastewater discharge device and method |
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