CN215640849U - Online chloride ion automatic measuring device of desulfurization slurry - Google Patents
Online chloride ion automatic measuring device of desulfurization slurry Download PDFInfo
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- CN215640849U CN215640849U CN202121392179.1U CN202121392179U CN215640849U CN 215640849 U CN215640849 U CN 215640849U CN 202121392179 U CN202121392179 U CN 202121392179U CN 215640849 U CN215640849 U CN 215640849U
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Abstract
An online automatic measuring device for chloride ions of desulfurization slurry comprises a water purification four-way interface, wherein a water purification control valve and a flowmeter are arranged on a water purification pipeline of a first outlet of the water purification four-way interface, a second outlet of the water purification four-way interface is connected with a desulfurization slurry pipeline through a system slurry pipeline flushing valve, a desulfurization slurry flow control valve and a flowmeter are arranged on the desulfurization slurry pipeline, the outlets of the water purification pipeline and the desulfurization slurry pipeline are both connected with an inlet of a slurry dilution buffer container, the outlet of the slurry dilution buffer container is connected with a water sample slurry inlet of a tubular membrane system, the water outlet of the tubular membrane system is connected with a measuring system, the outlet of a concentrated solution of the tubular membrane system is emptied, and the water purification inlet of the tubular membrane system is connected with a third outlet of the water purification four-way interface through a tubular membrane backwashing valve; the utility model realizes the real-time monitoring of the chloride ion content, fully-automatic operation, small manual maintenance amount and simple operation, can monitor the chloride ion content in the slurry in real time and ensure the safe and efficient operation of the desulfurization equipment.
Description
Technical Field
The utility model relates to the field of on-line monitoring of a desulfurization system of a thermal power plant, in particular to an on-line automatic measuring device for chloride ions in desulfurization slurry.
Background
In recent years, the country pays more and more attention to the environmental protection work of electric power. Flue gas SO of thermal power plant at present stage2The pollutant removing technology mainly comprises limestone-gypsum wet desulphurization. The fire coal contains about 0.01-0.2% of chlorine element, and enters a desulfurization device along with flue gas after combustion, and the water in the desulfurization device is recycled, so that chloride ions are gradually enriched in slurry of an absorption tower, and the concentration of the chloride ions in the slurry of the absorption tower exceeds the standard, and the following hazards are realized:
1) greatly reduce the quality of the gypsum
2) Cause the reduction of desulfurization efficiency and increase of the possibility of gypsum scaling
3) The corrosion and the damage to the desulfurization equipment are accelerated, and the safe and economic operation of the desulfurization device is directly threatened.
Therefore, the desulfurization device is provided with a matched desulfurization wastewater treatment system, and aims to reduce the concentration of chloride ions and the concentration of heavy metal ions in the slurry of the absorption tower and improve the quality of the slurry of the absorption tower by discharging a certain amount of wastewater. The amount of wastewater discharged depends mainly on the quality of the slurry. The content of chloride ions in the desulfurization slurry is mainly detected through a manual sampling laboratory, the workload is high, the requirement on the analysis level of workers is high, the sampling interval is generally 3-7 days, the content of the chloride ions in the slurry cannot be monitored in real time, and the data hysteresis is serious. Therefore, the development of the online chlorine ion monitoring device for the desulfurization slurry has important significance.
The desulfurization slurry has complex components, contains a large amount of heavy metal ions, sludge type suspended matters and other insoluble matters, has extremely high indexes such as turbidity, organic matter content and the like, and is very easy to pollute various measuring sensors and equipment. The chloride ion content measuring instrument is generally precise. The online monitoring technology for the chloride ions of the desulfurized slurry is still in the starting stage, just because the pretreatment work of the slurry is difficult to develop.
Disclosure of Invention
In order to overcome the problem that the content of chloride ions in the desulfurization slurry is difficult to monitor on line, the online automatic measurement device and the measurement method for chloride ions in the desulfurization slurry can realize the real-time monitoring of the content of chloride ions, the device adopts a full-automatic operation mode, the required manual maintenance amount is small, the operation is simple, the device can help operators to monitor the content of chloride ions in the slurry in real time, the quality of the slurry is better controlled, and the safe and efficient operation of desulfurization equipment is guaranteed.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an online automatic measuring device for chloride ions of desulfurization slurry comprises a water purification four-way connector 1 arranged on a water purification pipeline, wherein a water purification control valve 2-1 and a water purification flowmeter 3-1 are arranged on a water purification pipeline of a first outlet of the water purification four-way connector 1, a second outlet of the water purification four-way connector 1 is connected with a desulfurization slurry pipeline through a system slurry pipeline flushing valve 7, a desulfurization slurry flow control valve 2-2 and a desulfurization slurry flowmeter 3-2 are arranged on the desulfurization slurry pipeline, outlets of the water purification pipeline and the desulfurization slurry pipeline are connected with an inlet of a slurry dilution buffer container 4, an outlet of the slurry dilution buffer container 4 is connected with a water sample slurry inlet of a tubular membrane system 5, a water outlet of the tubular membrane system 5 is connected with a measuring system 6, a concentrated solution outlet of the tubular membrane system 5 is emptied, and a purified water inlet of the tubular membrane system 5 is connected with a third outlet of the water purification four-way connector 1 through a tubular membrane backwashing valve; when the system normally works, the slurry pipeline flushing valve 7 and the tubular membrane backwashing valve 8 of the system are in a normally closed state.
A tubular membrane is arranged in the tubular membrane system 5.
The measuring system 6 comprises a reaction cup and an optical detection system, wherein the optical detection system comprises a spectrophotometer.
The bottom of the slurry dilution buffer container 4 is detachably arranged, so that impurity solids remained at the bottom due to long-time operation can be conveniently cleaned.
Quantitative reagent X and reagent Y are sequentially added into the measuring system 6 through a control system to react with chloride ions, the reagent X is a composite reagent containing mercury thiocyanate, and the reagent Y is ammonium ferric sulfate.
When the measuring method of the online automatic measuring device for the chloride ions of the desulfurized slurry normally works, the dilution multiple of the desulfurized slurry is controlled to be between 100 and 1000 through the flow purified water control valve 2-1, the flow control valve 2-2 of the desulfurized slurry, the purified water flowmeter 3-1 and the desulfurized slurry flowmeter 3-2, and the purified water and the desulfurized slurry are fully mixed in the slurry dilution buffer container 4 and then enter the tubular membrane system 5; the tubular membrane system 5 filters suspended matters through pressure and a filter membrane, concentrated solution is discharged through the bottom, and effluent of the tubular membrane enters a measuring system 6; after a water sample to be detected reaches a reaction cup of the measuring system, the control system sequentially adds a quantitative compound reagent X containing mercury thiocyanate and an ammonium ferric sulfate reagent Y to react with chloride ions, and the reaction equation is as follows:
Hg(SCN)2+2Cl-＝HgCl2↓+2SCN-
Fe3++3SCN-＝Fe(SCN)3(Red)
An optical detection system of the measurement system detects the chloride ion concentration information in the water through an electric signal and multiplies the chloride ion concentration information by a dilution multiple to obtain the chloride ion content in the desulfurization slurry;
when the unit is stopped or the slurry pipeline is dirty and blocked, a system slurry pipeline flushing valve 7 and a desulfurization slurry flow control valve 2-2 are driven, a purified water flow control valve 2-1 is closed, purified water flushes the system desulfurization slurry pipeline from a four-way connector 1, slurry remaining in the pipeline is prevented from solidifying, and the pipeline and a desulfurization slurry flow meter are dredged; the bottom of the slurry dilution buffer container 4 is arranged detachably, so that impurity solids remained at the bottom due to long-time operation can be cleaned conveniently;
and (3) the tubular membrane in the tubular membrane system 5 runs for a long time, when the pressure difference between the inside and the outside of the tubular membrane is large, the tubular membrane backwashing valve 8 is opened, the purified water flow control valve 2-1 is closed, after the pressure is released, the tubular membrane is backwashed by purified water, and flushing liquid is discharged from the bottom of the tubular membrane system 5.
The utility model dilutes the components in the desulfurization slurry, and adjusts the flow ratio of the slurry and the purified water through the flow control valve for control, the equipment is simple, the diluted solution is fully mixed in the slurry dilution buffer container and then enters a subsequent tubular membrane system, and the tubular membrane system further processes the diluted slurry to ensure that the diluted slurry meets the requirements of an analytical instrument.
The tubular membrane adopts a cross-flow filtration mode, only part of liquid in the method permeates a filtration interface to become 'water production', the rest part of the liquid still exists in 'concentrated solution' of the system, and the concentrated solution almost takes away all suspended solids. The feeding is passed through in the tangential direction, the concentrated solution flows through the front section tangentially, the suspended substance in the filtering mode is not pressed to the surface of the membrane radially, and due to the tangential scouring effect of the inlet water, the occurrence of pollution blockage is relieved to a great extent. Tubular membrane filtration has been used in the pretreatment of desulfurization waste water.
The measuring system adopts a spectrophotometry method, the linear range is about 1-40 mg/L, the concentration of the desulfurization slurry is about 2000-20000 mg/L, and the requirement can be met by diluting 100-1000 times through a dilution system. The spectrophotometry has the advantages of lower instrument cost, simpler operation, better accuracy and precision, and can realize on-line monitoring when a continuous sample introduction mode is adopted. After a water sample enters the measuring cup, the water sample reacts with a composite reagent with the main component of mercury thiocyanate to generate mercuric chloride precipitate and simultaneously quantitatively replace SCN-And complexing with ferric ammonium sulfate to generate red ferric thiocyanate, and performing colorimetric determination at a wavelength of 460nm, wherein the shade of the color is in direct proportion to the content of chloride ions.
The self-cleaning system comprises a desulfurization pipeline cleaning system and a tubular membrane backwashing system. The desulfurization pipeline cleaning system can prevent the pipeline from being polluted and blocked. The tubular membrane back-flushing system can greatly improve the running period of the tubular membrane.
According to the above description, the present invention has the following advantageous effects:
a) the device for automatically measuring the chloride ions of the desulfurization slurry on line can realize real-time monitoring of the chloride ions of the desulfurization slurry, avoid the trouble of manual measurement, and has the advantages of simple operation, small maintenance amount and high measurement precision.
b) The self-cleaning system is provided, and when the unit is stopped or the slurry pipeline is polluted and blocked, the cleaning system is flushed and dredged by using pure water; when the tubular membrane runs for a period of time, the tubular membrane is backwashed by using clean water, so that the service cycle of the tubular membrane can be effectively prolonged.
Drawings
FIG. 1 is a schematic view of a measuring apparatus according to the present invention. Wherein, 1 is a water purification four-way connector, 2-1 is a water purification flow control valve, 2-2 is a desulfurization slurry flow control valve, 3-1 is a water purification flow meter, 3-2 is a desulfurization slurry flow meter, 4 is a slurry dilution buffer container, 5 is a tubular membrane system, 6 is a measurement system, 7 is a system slurry pipeline flushing valve, and 8 is a tubular membrane backwashing valve.
Fig. 2 is a schematic view of a measurement flow of the measurement system.
Detailed Description
The utility model is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the working process of the present invention is: the dilution multiple of the desulfurization slurry is controlled to be about 100-1000 by the flow purified water control valve 2-1, the desulfurization slurry flow control valve 2-2, the purified water flowmeter 3-1 and the desulfurization slurry flowmeter 3-2, and the purified water and the desulfurization slurry are fully mixed in the slurry dilution buffer container 4 and then enter the tubular membrane system 5. The tube membrane in the tube membrane system 5 filters the suspended matters through pressure and a filter membrane, the concentrated solution is discharged through the bottom, and the effluent of the tube membrane enters a measuring system 6. The working process of the measuring system is shown in figure 2, after a water sample to be measured reaches a reaction cup of the measuring system, the control system sequentially adds a quantitative reagent X (a composite reagent containing mercury thiocyanate) and a quantitative reagent Y (ammonium ferric sulfate) to react with chloride ions, an optical detection system of the measuring system detects out the chloride ion concentration information in the water through an electric signal, and the information is multiplied by a dilution multiple, so that the chloride ion content in the desulfurization slurry can be obtained.
When the unit is shut down or the slurry pipeline is dirty and blocked, the system slurry pipeline flushing valve 7 and the desulfurization slurry flow control valve 2-2 are flushed, the purified water flow control valve 2-1 is closed, purified water flushes the system desulfurization slurry pipeline from the four-way connector 1, residual slurry in the pipeline is prevented from solidifying, and the pipeline and the desulfurization slurry flow meter are dredged. The bottom of the slurry dilution buffer container 4 is arranged to be detachable, so that impurity solids remained at the bottom due to long-time operation can be cleaned conveniently.
And (3) the tubular membrane in the tubular membrane system 5 runs for a long time, when the pressure difference between the inside and outside of the membrane is large, the tubular membrane backwashing valve 8 is opened, the purified water flow control valve 2-1 is closed, after the pressure is released, the tubular membrane is backwashed by using purified water, and flushing liquid is discharged from the bottom of the tubular membrane system 5.
According to different slurry chloride ion content ranges of the power plants, a proper dilution multiple is set, so that a water sample entering the instrument is in a linear range of a spectrophotometer of the optical detection system, and the accuracy of measurement is guaranteed.
The online automatic measuring device for chloride ions in the desulfurization slurry, provided by the utility model, adopts the principle of dilution-tubular membrane pretreatment-spectrophotometry measurement, overcomes the problems of more impurities and high chloride ion content of the desulfurization slurry, and has the advantages of simplicity in operation, small maintenance amount, high measurement precision and the like. The device is provided with a self-cleaning system, and can ensure the high-efficiency long-time operation of the system.
Claims (4)
1. The utility model provides an online chlorion automatic measuring device of desulfurization thick liquid which characterized in that: the device comprises a water purification four-way connector (1) arranged on a water purification pipeline, wherein a water purification control valve (2-1) and a water purification flowmeter (3-1) are arranged on the water purification pipeline of a first outlet of the water purification four-way connector (1), a second outlet of the water purification four-way connector (1) is connected with a desulfurization slurry pipeline through a system slurry pipeline flushing valve (7), the desulfurization slurry pipeline is provided with a desulfurization slurry flow control valve (2-2) and a desulfurization slurry flowmeter (3-2), outlets of the water purification pipeline and the desulfurization slurry pipeline are both connected with an inlet of a slurry dilution buffer container (4), an outlet of the slurry dilution buffer container (4) is connected with a water sample slurry inlet of a tubular membrane system (5), a water outlet of the tubular membrane system (5) is connected with a measuring system (6), a concentrated solution outlet of the tubular membrane system (5) is emptied, and a water purification inlet of the tubular membrane system (5) is connected with a third outlet of the water purification four-way connector (1) through a tubular membrane backwashing valve; when the system normally works, the slurry pipeline flushing valve (7) and the tubular membrane backwashing valve (8) are in a normally closed state.
2. The device for automatically measuring chloride ions in desulfurization slurry on line according to claim 1, characterized in that: and a tubular membrane is arranged in the tubular membrane system (5).
3. The device for automatically measuring chloride ions in desulfurization slurry on line according to claim 1, characterized in that: the measuring system (6) comprises a reaction cup and an optical detection system, wherein the optical detection system comprises a spectrophotometer.
4. The device for automatically measuring chloride ions in desulfurization slurry on line according to claim 1, characterized in that: the bottom of the slurry dilution buffer container (4) is arranged to be detachable, so that the residual impurity solids at the bottom due to long-time operation can be cleaned conveniently.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121392179.1U CN215640849U (en) | 2021-06-22 | 2021-06-22 | Online chloride ion automatic measuring device of desulfurization slurry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121392179.1U CN215640849U (en) | 2021-06-22 | 2021-06-22 | Online chloride ion automatic measuring device of desulfurization slurry |
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| Publication Number | Publication Date |
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| CN215640849U true CN215640849U (en) | 2022-01-25 |
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| CN202121392179.1U Active CN215640849U (en) | 2021-06-22 | 2021-06-22 | Online chloride ion automatic measuring device of desulfurization slurry |
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2021
- 2021-06-22 CN CN202121392179.1U patent/CN215640849U/en active Active
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