CN116559250B - Online detection device and method for chloride ions of desulfurization slurry of thermal power plant - Google Patents
Online detection device and method for chloride ions of desulfurization slurry of thermal power plant Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 122
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 title claims abstract description 107
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 87
- 230000023556 desulfurization Effects 0.000 title claims abstract description 87
- 239000002002 slurry Substances 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title description 20
- 239000008235 industrial water Substances 0.000 claims abstract description 98
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- 238000010790 dilution Methods 0.000 claims abstract description 31
- 239000012895 dilution Substances 0.000 claims abstract description 31
- 238000005070 sampling Methods 0.000 claims abstract description 12
- 238000010521 absorption reaction Methods 0.000 claims abstract description 11
- 238000001914 filtration Methods 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims description 14
- 239000010865 sewage Substances 0.000 claims description 7
- 238000005086 pumping Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 6
- 239000012535 impurity Substances 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000011010 flushing procedure Methods 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 229910052602 gypsum Inorganic materials 0.000 description 3
- 239000010440 gypsum Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- -1 have two sources Chemical compound 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
-
- 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
- G01N27/28—Electrolytic cell components
- G01N27/30—Electrodes, e.g. test electrodes; Half-cells
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Chemical Kinetics & Catalysis (AREA)
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- Sampling And Sample Adjustment (AREA)
Abstract
The application relates to the field of online supervision of desulfurization slurry chloride ions, and discloses an online detection device and an online detection method for desulfurization slurry chloride ions of a thermal power plant, wherein the online detection device comprises: the pretreatment system is communicated with a sampling tube of the desulfurization absorption tower and is used for filtering desulfurization slurry to obtain a water sample to be detected; the detection system comprises an industrial water constant container, a detection box and a detection electrode inserted in the detection box, wherein the industrial water constant container is used for fixing the volume of industrial water and conveying the industrial water to the detection box, the detection electrode is used for detecting the first chloride ion concentration of the industrial water and the second chloride ion concentration of the water sample to be detected after the industrial water is diluted, and the concentration of the desulfurization slurry chloride ions is determined according to the first chloride ion concentration, the second chloride ion concentration and the dilution multiple. The device is communicated with the sampling tube of the desulfurization absorption tower, so that the concentration of chloride ions of desulfurization slurry can be monitored on line in real time; the pretreatment system filters the desulfurization slurry, reduces pollution and damage of impurities to the detection electrode, improves the electrode measurement accuracy, and prolongs the service life of the electrode.
Description
Technical Field
The application relates to the field of online supervision of desulfurization slurry chloride ions, in particular to an online detection device and method for desulfurization slurry chloride ions of a thermal power plant.
Background
Limestone-gypsum wet flue gas desulfurization is a mainstream desulfurization process of a thermal power plant, and in the design rule of limestone-gypsum wet flue gas desulfurization system of the thermal power plant (DL/T5196-2016), it is clearly pointed out that the concentration of chloride ions in the operation of an absorption tower slurry pool is not higher than 20000ppm, and the corrosion resistance of a component material contacting the absorption tower slurry is designed according to the concentration of chloride ions of not less than 40000 ppm. In the desulfurization slurry, the chloride ions mainly have two sources, most of the chloride ions are carried in the flue gas after the combustion of the coal to a desulfurization system, and the other part of the chloride ions are carried in the process water, so that the concentration of the chloride ions is gradually increased along with the recycling of the slurry. Gypsum and desulfurization wastewater carry out chloride ions to maintain ion balance of the desulfurization system.
Under the background of new energy structure transformation, a large number of thermal power plants have larger load fluctuation and higher influence on the operation of a desulfurization system and the chloride ion concentration balance of desulfurization slurry. The desulfurization slurry has high solid content and complex components, contains a large amount of heavy metal ions, sludge suspended matters and other insoluble matters, has extremely high indexes such as turbidity, organic matter content and the like, is extremely easy to pollute a measuring electrode and a sensor, and influences the measuring precision.
Therefore, how to realize real-time monitoring of chloride ions in desulfurization slurry, improve measurement accuracy, and ensure safe and stable operation of a desulfurization system is a problem to be solved by those skilled in the art.
Disclosure of Invention
The application aims to provide a device and a method for online detection of desulfurization slurry chloride ions in a thermal power plant.
For solving above-mentioned technical problem, this application provides a thermal power plant's desulfurization thick liquid chloride ion on-line measuring device, include:
the pretreatment system is communicated with a sampling tube of the desulfurization absorption tower and is used for filtering desulfurization slurry to obtain a water sample to be detected;
the detection system comprises an industrial water fixed container, a detection box and a detection electrode, wherein the detection box is respectively communicated with the industrial water fixed container and the pretreatment system, the detection electrode is inserted in the detection box, the industrial water fixed container is used for fixing the volume of industrial water and conveying the industrial water to the detection box so as to dilute the water sample to be detected, and the detection electrode is used for detecting the first chloride ion concentration of the industrial water and the second chloride ion concentration of the water sample to be detected after the industrial water is diluted so as to determine the chloride ion concentration of the desulfurization slurry according to the first chloride ion concentration, the second chloride ion concentration and the dilution factor.
Optionally, the pretreatment system comprises a sample flow pipeline, a filter screen, a filter cartridge, a first overflow pipe, a sample pipeline to be tested and a sewage pipeline;
the first end of the sample flow pipeline is communicated with the sampling pipe through a first valve and is communicated with the industrial water pipe through a second valve, the second end of the sample flow pipeline is communicated with the pit, a through hole is formed between the first end and the second end of the sample flow pipeline, the through hole is communicated with the top opening of the filter cylinder, and the through hole is provided with the filter screen;
the sample pipeline to be detected is respectively communicated with the bottom of the filter cartridge and the detection box, and is provided with a third valve;
the bottom of the filter cylinder is communicated with the pit through the sewage drain pipe, and the sewage drain pipe is provided with a fourth valve;
the filter cartridge is characterized in that a first overflow hole is formed in a preset height position of the filter cartridge, the first overflow hole is communicated with the pit through a first overflow pipe, and a fifth valve is arranged on the first overflow pipe.
Optionally, the position close to the top opening of the filter cartridge is communicated with a vacuum pump through a sixth valve, and the vacuum pump is used for pumping air in the filter cartridge to enable the filter cartridge to be in a negative pressure state.
Optionally, the cross section of the sample flow channel is square.
Optionally, the top of the industrial water fixed container is communicated with the industrial water pipe through a seventh valve, the bottom of the industrial water fixed container is communicated with the detection box through an eighth valve, a second overflow hole is formed in a preset height of the industrial water fixed container, the second overflow hole is communicated with a second overflow pipe, and the detection box is communicated with the pit through a ninth valve.
Optionally, a magnetic stirrer is installed at the bottom of the detection box.
Optionally, the detection electrode is connected with a program control system, and the program control system is used for displaying the first chloride ion concentration, the second chloride ion concentration and the desulfurization slurry chloride ion concentration in real time.
Optionally, the first overflow hole is provided with a first annunciator for detecting the liquid level in the filter cylinder, and the second overflow hole is provided with a second annunciator for detecting the liquid level in the industrial water container.
Optionally, the device further comprises a dilution box communicated with the sample pipeline to be tested, the dilution box is communicated with the industrial water container through an eighth valve, the dilution box is communicated with the detection box through a tenth valve, and the side wall of the dilution box is provided with scale marks and volume values corresponding to each scale mark.
The application also provides an online detection method for the chloride ions of the desulfurization slurry in the thermal power plant, which is applied to the online detection device for the chloride ions of the desulfurization slurry in the thermal power plant, and comprises the following steps:
industrial water conveyed to a detection box by utilizing an industrial water directional container, and detecting the first chloride ion concentration of the industrial water by utilizing a detection electrode;
filtering the desulfurization slurry by using a pretreatment system to obtain a water sample to be detected, conveying the water sample to be detected to the detection box, and detecting the concentration of second chloride ions of the water sample to be detected diluted by the industrial water by using the detection electrode;
and determining the concentration of chloride ions of the desulfurization slurry according to the first concentration of chloride ions, the second concentration of chloride ions and the dilution factor.
The utility model provides a desulfurization thick liquid chloride ion on-line measuring device of thermal power plant, include: the pretreatment system is communicated with a sampling tube of the desulfurization absorption tower and is used for filtering desulfurization slurry to obtain a water sample to be detected; the detection system comprises an industrial water fixed container, a detection box and a detection electrode, wherein the detection box is respectively communicated with the industrial water fixed container and the pretreatment system, the detection electrode is inserted into the detection box, the industrial water fixed container is used for fixing the volume of industrial water and conveying the industrial water to the detection box so as to dilute a water sample to be detected, and the detection electrode is used for detecting the first chloride ion concentration of the industrial water and the second chloride ion concentration of the water sample to be detected diluted by the industrial water so as to determine the chloride ion concentration of the desulfurization slurry according to the first chloride ion concentration, the second chloride ion concentration and the dilution factor. The device is communicated with the sampling tube of the desulfurization absorption tower, so that the concentration of chloride ions of desulfurization slurry can be monitored on line in real time; the pretreatment system filters the desulfurization slurry, reduces pollution and damage of impurities to the detection electrode, improves the electrode measurement accuracy, and prolongs the service life of the electrode; and secondly, the device does not need manual operation, and the maintenance workload is small.
The online detection method for the chloride ions of the desulfurization slurry in the thermal power plant has the beneficial effects that the online detection method corresponds to the device, and the effects are as above.
Drawings
For a clearer description of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described, it being apparent that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of an online detection device for chloride ions in desulfurization slurry of a thermal power plant according to an embodiment of the present application;
fig. 2 is a block diagram of a preprocessing device provided in an embodiment of the present application;
FIG. 3 is a block diagram of a detection system according to an embodiment of the present application;
FIG. 4 is a partial view of a sample flow conduit and cartridge provided in an embodiment of the present application;
FIG. 5 is a partial view of a sample flow conduit according to an embodiment of the present disclosure;
FIG. 6 is a flowchart of a method for online detecting chloride ions in desulfurization slurry of a thermal power plant according to an embodiment of the present application;
the reference numerals are as follows: the device comprises a pretreatment system 1, a detection system 2, a program control system 3, a sample flowing pipeline 101, a filter screen 102, a filter cartridge 103, a first overflow pipe 104, a sample pipeline to be tested 105, a sewage pipeline 106, a first valve 107, a second valve 108, a third valve 109, a fourth valve 110, a fifth valve 111, a sixth valve 112, a vacuum pump 113, an industrial water container 201, a detection box 202, a detection electrode 203, a seventh valve 204, an eighth valve 205, a second overflow pipe 206, a ninth valve 207 and a magnetic stirrer 208.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments herein without making any inventive effort are intended to fall within the scope of the present application.
The core of the application is to provide a device and a method for online detection of the chloride ions of desulfurization slurry in a thermal power plant.
In order to provide a better understanding of the present application, those skilled in the art will now make further details of the present application with reference to the drawings and detailed description.
Fig. 1 is a block diagram of an online detection device for sulfur slurry chloride ions in a thermal power plant according to an embodiment of the present application, as shown in fig. 1, the online detection device for sulfur slurry chloride ions includes: the pretreatment system 1 is communicated with a sampling tube of the desulfurization absorption tower and is used for filtering desulfurization slurry to obtain a water sample to be detected; the detection system 2 comprises an industrial water constant volume container 201, a detection box 202 and a detection electrode 203, wherein the detection box 202 is respectively communicated with the industrial water constant volume container 201 and the pretreatment system 2, the detection electrode 203 is inserted into the detection box 202, the industrial water constant volume container 201 is used for fixing industrial water and conveying the industrial water with a preset volume to the detection box 202 so as to dilute a water sample to be detected, and the detection electrode 203 is used for detecting the first chloride ion concentration of the industrial water and the second chloride ion concentration of the water sample to be detected after being diluted by the industrial water so as to determine the chloride ion concentration of desulfurization slurry according to the first chloride ion concentration, the second chloride ion concentration and the dilution factor.
The pretreatment system 1 is not particularly limited, and the pretreatment system 1 is used for filtering solid waste in desulfurization slurry to obtain a water sample to be detected with a preset volume, and the solid content of the desulfurization slurry is about 20%, so that the solid content of the water sample to be detected can be reduced to below 1% through the pretreatment system 1. Fig. 2 is a block diagram of a pretreatment device according to an embodiment of the present application, and as shown in fig. 2, a pretreatment system 1 includes a sample flow channel 101, a filter screen 102, a filter cartridge 103, a first overflow pipe 104, a sample channel 105 to be tested, and a drain channel 106; the first end of the sample flow pipeline 101 is respectively communicated with the sampling pipe through a first valve 107, is communicated with the industrial water pipe through a second valve 108, the second end of the sample flow pipeline 101 is communicated with the pit, a through hole is arranged between the first end and the second end of the sample flow pipeline 101, the through hole is communicated with the top opening of the filter cylinder 103, and a filter screen 102 is arranged in the through hole; the sample pipeline 105 to be tested is respectively communicated with the bottom of the filter cylinder 103 and the detection box 202, and the sample pipeline 105 to be tested is provided with a third valve 109; the bottom of the filter cylinder 103 is communicated with the pit through a drain pipe 106, and the drain pipe 106 is provided with a fourth valve 110; the filter cartridge 103 is provided with a first overflow hole at a preset height, the first overflow hole is communicated with the pit through a first overflow pipe 104, and the first overflow pipe 104 is provided with a fifth valve 111. The opening position of the first overflow hole can be set according to actual needs, and the opening position of the first overflow hole determines the volume of the water sample to be measured with constant volume.
Fig. 3 is a block diagram of a detection system according to an embodiment of the present application, and as shown in fig. 3, the detection system includes an industrial water constant volume container 201, a detection box 202 respectively communicating with the industrial water constant volume container 201 and the pretreatment system 1, and a detection electrode 203 disposed on the top of the detection box 202. Specifically, the top of the industrial water fixed container 201 is communicated with the industrial water pipe through a seventh valve 204, the bottom of the industrial water fixed container 201 is communicated with the detection box 202 through an eighth valve 205, a second overflow hole is formed at a preset height of the industrial water fixed container 201, the second overflow hole is communicated with a second overflow pipe 206, the position of the second overflow hole can be set according to actual needs, and the position of the second overflow hole determines the volume of industrial water with fixed volume. The detection tank 202 communicates with a pit for recovering waste water through a ninth valve 207. The detection system 2 can be arranged at the bottom of the pretreatment system 1, so that the water sample to be detected can be conveniently conveyed to the detection box 202 under the action of gravity.
The embodiment of the application provides a desulfurization thick liquid chloride ion on-line measuring device of thermal power plant, include: the pretreatment system is communicated with a sampling tube of the desulfurization absorption tower and is used for filtering desulfurization slurry to obtain a water sample to be detected; the detection system comprises an industrial water fixed container, a detection box and a detection electrode, wherein the detection box is respectively communicated with the industrial water fixed container and the pretreatment system, the detection electrode is inserted into the detection box, the industrial water fixed container is used for fixing the volume of industrial water and conveying the industrial water to the detection box so as to dilute a water sample to be detected, and the detection electrode is used for detecting the first chloride ion concentration of the industrial water and the second chloride ion concentration of the water sample to be detected diluted by the industrial water so as to determine the chloride ion concentration of the desulfurization slurry according to the first chloride ion concentration, the second chloride ion concentration and the dilution factor. The device is communicated with the sampling tube of the desulfurization absorption tower, so that the concentration of chloride ions of desulfurization slurry can be monitored on line in real time; the pretreatment system filters the desulfurization slurry, reduces pollution and damage of impurities to the detection electrode, improves the electrode measurement accuracy, and prolongs the service life of the electrode; and secondly, the device does not need manual operation, and the maintenance workload is small.
Based on the above embodiment, the pretreatment system 1 in the embodiment of the present application further includes a vacuum pump 113, where a position near the top opening of the filter cartridge 103 is communicated with the vacuum pump 113 through a sixth valve 112, and the vacuum pump 113 is used to pump air in the filter cartridge 103 to make the filter cartridge 103 in a negative pressure state.
By arranging the vacuum pump 113, the desulfurization slurry can flow into the filter cylinder 103 after being filtered by the filter screen 102, and the filter screen 102 can be effectively prevented from being blocked.
Based on the above embodiments, the cross section of the sample flow channel 101 in the embodiments of the present application is square. The sample flow channel 101 is a hollow cuboid channel, so that a through hole communicated with the top opening of the filter cartridge 103 is conveniently formed in the side wall of the sample flow channel 101.
Fig. 4 is a partial view of a sample flow channel and a filter cartridge according to an embodiment of the present application, and fig. 5 is a partial view of a sample flow channel according to an embodiment of the present application, in which the size of the cross section of the sample flow channel 101 is not particularly limited, and the size of the cross section may be set to 10cm
*10cm, as shown in fig. 5, the through hole formed in the side wall of the corresponding sample flow pipeline 101 is 30cm long and 10cm wide, a filter screen 102 with the length of 30cm and the width of 10cm is arranged at the through hole, the particle interception capacity of the filter screen 102 is less than 10um, as shown in fig. 4, a filter cartridge 103 is arranged at the lower end of the filter screen 102, the upper end of the filter cartridge 103 is tightly connected with the filter screen 102 part of the sample flow pipeline 101, and the filter cartridge 103 is 30cm wide, 40cm long and 50cm high.
Based on the above embodiment, the bottom of the detection box 202 in the embodiment of the present application is provided with the magnetic stirrer 208, and a certain distance needs to be kept between the top of the magnetic stirrer 208 and the bottom of the detection electrode 203 to prevent mutual interference, and the specific distance between the two may be 5cm.
The magnetic stirrer 208 can be used for fully mixing the water sample to be detected with industrial water, so that the accuracy of chloride ion concentration detection is ensured.
Based on the above embodiment, the embodiment of the application further includes a program control system 3, the detection electrode 203 is connected with the program control system 3, and the program control system 3 may include a display screen, which can display the first chloride ion concentration, the second chloride ion concentration and the desulfurization slurry chloride ion concentration in real time. Through realizing showing above-mentioned data, make things convenient for the staff to know desulfurization thick liquid chloride ion concentration in time.
Based on the above embodiment, a first annunciator for detecting the liquid level in the filter cartridge 103 is provided at the first overflow hole, and a second annunciator for detecting the liquid level in the industrial water constant volume container 201 is provided at the second overflow hole.
By arranging the first annunciator and the second annunciator, when the water sample to be detected reaches the first overflow hole, the first annunciator responds, the vacuum pump and the first valve 107 are closed, the fifth valve 111 is opened, the excessive sample overflows, and the rest is the water sample to be detected with a constant volume. When the industrial water reaches the second overflow hole, the seventh valve 204 is closed, and the excessive industrial water overflows.
Based on the above embodiment, the embodiment of the application further includes a dilution box that is communicated with the sample pipe 105 to be tested, the dilution box is communicated with the industrial water constant volume device through the eighth valve, the dilution box is communicated with the detection box 202 through the tenth valve, and the side wall of the dilution box is provided with scale marks and volume values corresponding to each scale mark.
By arranging the dilution box and combining the industrial water constant volume device 201, the water sample to be tested can be diluted step by step. For example, the pretreatment system 1 conveys 10ml of the water sample to be tested to the dilution tank, the industrial water fixing container 201 conveys 90ml of the industrial water to the dilution tank, the dilution multiple of the water sample to be tested is 10 times, the water sample to be tested diluted 10 times in the dilution tank is removed, 10ml of the water sample to be tested diluted 10 times can be reserved, and the industrial water fixing container 201 continuously conveys 90ml of the industrial water to the dilution tank, and at the moment, the water sample to be tested is further diluted 10 times.
Because the content of chloride ions in the desulfurization slurry is high, the desulfurization slurry can adapt to the measurement range of the electrode by stepwise dilution, and the measurement accuracy is improved.
Based on the above embodiments, fig. 6 is a flowchart of an online detection method for chloride ions in desulfurization slurry of a thermal power plant according to an embodiment of the present application, as shown in fig. 6, where the online detection method includes:
s10: and detecting the first chloride ion concentration of the industrial water by using the industrial water conveyed to the detection box by using the industrial water fixed container.
S11: and filtering the desulfurization slurry by using a pretreatment system to obtain a water sample to be detected, conveying the water sample to be detected to a detection box, and detecting the concentration of second chloride ions of the water sample to be detected diluted by the industrial water by using a detection electrode.
S12: and determining the concentration of chloride ions of the desulfurization slurry according to the first concentration of chloride ions, the second concentration of chloride ions and the dilution factor.
The dilution factor in the embodiment of the application can be calculated according to the volume of the water sample to be measured and the volume of the industrial water for diluting the water sample to be measured. The method for determining the concentration of chloride ions in the desulfurization slurry according to the concentration of the first chloride ions, the concentration of the second chloride ions and the dilution factor comprises the following steps: concentration of chloride ions in desulfurization slurry c= (C 2 -C 1 )*n，C 1 Is the first chloride ion concentration, C 2 The concentration of the second chloride ions, and n is the dilution multiple.
For easy understanding, the following describes the method for using the device for detecting the chloride ions in the desulfurization slurry of the thermal power plant on line.
1. Method for using pretreatment system
Closing the first valve 107, the sixth valve 112, the third valve 109 and the fifth valve 111, opening the second valve 108 and the fourth valve 110, and flushing the pretreatment system for 1min by using industrial water; the second valve 108 is closed, the fourth valve 110 is kept open for 2 minutes, and the industrial water in the system is emptied.
Closing the second valve 108, the third valve 109, the fourth valve 110 and the fifth valve 111, opening the first valve 107 and the sixth valve 112, opening the vacuum pump 113, and filtering the desulfurization slurry; after the first annunciator responds, the vacuum pump 113 is closed, the first valve 107, the second valve 108, the sixth valve 112, the third valve 109 and the fourth valve 110 are closed, and the fifth valve 111 is opened; the fourth valve 110 was opened and held for 2 minutes to empty the system of liquid. The pretreatment system is rinsed with desulfurization slurry.
The second valve 108, the third valve 109, the fourth valve 110 and the fifth valve 111 are closed, the first valve 107 and the sixth valve 112 are opened, the vacuum pump 113 is opened, the desulfurization slurry is filtered, after the first annunciator responds, the vacuum pump 113 is closed, the first valve 107, the second valve 108, the sixth valve 112, the third valve 109 and the fourth valve 110 are closed, and the fifth valve 111 is opened. At this time, the filter cartridge 103 is internally fixed with a preset volume of water sample to be measured.
Third valve 109 is opened to discharge the sample to be tested in pretreatment system 1 into test box 202.
After the end, the pretreatment system 1 can be rinsed, and the rinsed waste liquid can be discharged into the pit. The flushing water adopts industrial water of a thermal power plant.
2. Method for using detection system
And opening a seventh valve 204, an eighth valve 205 and a ninth valve 207, flushing the detection system for 1min by using the industrial water, closing the seventh valve 204, opening the eighth valve 205 and the ninth valve 207, and draining the industrial water in the system.
The eighth valve 205 and the ninth valve 207 are closed, the seventh valve 204 is opened, and the seventh valve 204 is closed when the second annunciator responds. This step fixes the volume of the industrial water in the industrial water fixed container 201 by a predetermined volume.
The eighth valve 205 is opened to discharge the industrial water into the detection tank 202, and the detection electrode 203 detects the first chloride ion concentration C of the industrial water 1 。
After the water sample to be detected in the pretreatment system 1 is discharged into the detection box 202, a magnetic stirrer 208 is started, stirred for 30 seconds, and after standing for 30 seconds, the detection electrode 203 detects the concentration C of the second chloride ions of the water sample to be detected diluted by the industrial water 2 。
After the end, the detection system 2 may be flushed, and the flushed waste liquid may be discharged into the pit. The flushing water adopts industrial water of a thermal power plant.
The online detection device for the chloride ions of the desulfurization slurry in the thermal power plant provided by the application is described in detail. In the description, each embodiment is described in a progressive manner, and each embodiment is mainly described by the differences from other embodiments, so that the same similar parts among the embodiments are mutually referred. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section. It should be noted that it would be obvious to those skilled in the art that various improvements and modifications can be made to the present application without departing from the principles of the present application, and such improvements and modifications fall within the scope of the claims of the present application.
It should also be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Claims (8)
1. The utility model provides a thermal power plant's desulfurization thick liquid chloride ion on-line measuring device which characterized in that includes:
the pretreatment system (1) is communicated with a sampling tube of the desulfurization absorption tower and is used for filtering desulfurization slurry to obtain a water sample to be detected;
the detection system (2) comprises an industrial water constant volume device (201), a detection box (202) respectively communicated with the industrial water constant volume device (201) and the pretreatment system (1), and a detection electrode (203) inserted into the detection box (202), wherein the industrial water constant volume device (201) is used for constant volume industrial water and conveying industrial water to the detection box (202) so as to dilute the water sample to be detected, and the detection electrode (203) is used for detecting a first chloride ion concentration of the industrial water and a second chloride ion concentration of the water sample to be detected after being diluted by the industrial water so as to determine a desulfurization slurry chloride ion concentration according to the first chloride ion concentration, the second chloride ion concentration and a dilution factor;
the pretreatment system (1) comprises a sample flowing pipeline (101), a filter screen (102), a filter cartridge (103), a first overflow pipe (104), a sample pipeline (105) to be tested and a sewage pipeline (106);
the first end of the sample flow pipeline (101) is communicated with the sampling pipe through a first valve (107) and is communicated with the industrial water pipe through a second valve (108), the second end of the sample flow pipeline (101) is communicated with the pit, a through hole is formed between the first end and the second end of the sample flow pipeline (101), the through hole is communicated with the top opening of the filter cylinder (103), and the through hole is provided with the filter screen (102);
the to-be-detected sample pipeline (105) is respectively communicated with the bottom of the filter cylinder (103) and the detection box (202), and the to-be-detected sample pipeline (105) is provided with a third valve (109);
the bottom of the filter cylinder (103) is communicated with the pit through the sewage drain pipeline (106), and the sewage drain pipeline (106) is provided with a fourth valve (110);
a first overflow hole is formed in the preset height position of the filter cylinder (103), the first overflow hole is communicated with the pit through the first overflow pipe (104), and the first overflow pipe (104) is provided with a fifth valve (111);
the position close to the top opening of the filter cartridge (103) is communicated with a vacuum pump (113) through a sixth valve (112), and the vacuum pump (113) is used for pumping air in the filter cartridge (103) to enable the filter cartridge (103) to be in a negative pressure state.
2. The on-line detection device for desulfurization slurry chloride ions in a thermal power plant according to claim 1, wherein the cross section of the sample flow conduit (101) is square.
3. The online detection device for the desulfurization slurry chloride ions of the thermal power plant according to claim 1, wherein the top of the industrial water constant volume device (201) is communicated with an industrial water pipe through a seventh valve (204), the bottom of the industrial water constant volume device (201) is communicated with the detection box (202) through an eighth valve (205), a second overflow hole is formed at a preset height of the industrial water constant volume device (201), the second overflow hole is communicated with a second overflow pipe (206), and the detection box (202) is communicated with a pit through a ninth valve (207).
4. The on-line detection device for the chloride ions of the desulfurization slurry in the thermal power plant according to claim 1, wherein a magnetic stirrer (208) is arranged at the bottom of the detection box (202).
5. The on-line detection device for the chloride ions of the desulfurization slurry in the thermal power plant according to claim 1, wherein the detection electrode (203) is connected with a program control system (3), and the program control system (3) is used for displaying the first chloride ion concentration, the second chloride ion concentration and the chloride ion concentration of the desulfurization slurry in real time.
6. A device for on-line detection of chloride ions in desulfurization slurry in a thermal power plant according to claim 3, characterized in that a first annunciator for detecting the liquid level in the filter cartridge (103) is arranged at the first overflow hole, and a second annunciator for detecting the liquid level in the industrial water constant volume vessel (201) is arranged at the second overflow hole.
7. The on-line detection device for the desulfurization slurry chloride ions of the thermal power plant according to claim 3, further comprising a dilution box communicated with the sample pipeline (105) to be detected, wherein the dilution box is communicated with the industrial water container (201) through an eighth valve (205), the dilution box is communicated with the detection box (202) through a tenth valve, and the side wall of the dilution box is provided with scale marks and volume values corresponding to each scale mark.
8. An online detection method for chloride ions in desulfurization slurry of a thermal power plant, which is applied to the online detection device for chloride ions in desulfurization slurry of a thermal power plant according to any one of claims 1 to 7, and comprises the following steps:
industrial water conveyed to a detection box (202) by utilizing an industrial water constant volume device (201), and detecting the first chloride ion concentration of the industrial water by utilizing a detection electrode (203);
filtering the desulfurization slurry by using a pretreatment system (1) to obtain a water sample to be detected, conveying the water sample to be detected to the detection box (202), and detecting the concentration of second chloride ions of the water sample to be detected diluted by the industrial water by using the detection electrode (203);
and determining the concentration of chloride ions of the desulfurization slurry according to the first concentration of chloride ions, the second concentration of chloride ions and the dilution factor.
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| CN116559250A (en) | 2023-08-08 |
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