CN111701406A - Flue gas dewatering system and method for flue gas detection - Google Patents
Flue gas dewatering system and method for flue gas detection Download PDFInfo
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- CN111701406A CN111701406A CN202010671093.6A CN202010671093A CN111701406A CN 111701406 A CN111701406 A CN 111701406A CN 202010671093 A CN202010671093 A CN 202010671093A CN 111701406 A CN111701406 A CN 111701406A
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 124
- 239000003546 flue gas Substances 0.000 title claims abstract description 124
- 238000001514 detection method Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000007788 liquid Substances 0.000 claims abstract description 111
- 238000007599 discharging Methods 0.000 claims abstract description 21
- 239000007789 gas Substances 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 74
- 238000005057 refrigeration Methods 0.000 claims description 10
- 239000000779 smoke Substances 0.000 claims description 10
- 238000009413 insulation Methods 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 3
- 230000002572 peristaltic effect Effects 0.000 claims description 2
- 230000003068 static effect Effects 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000004321 preservation Methods 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000738 capillary electrophoresis-mass spectrometry Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/265—Drying gases or vapours by refrigeration (condensation)
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Abstract
The invention relates to the technical field of coal-fired flue gas environmental protection, in particular to a flue gas dewatering system and a flue gas dewatering method for flue gas detection. The system comprises a control unit, a heat preservation shell, a gas-liquid separator, a temperature controller and a refrigerating system, wherein the gas-liquid separator, the temperature controller and the refrigerating system are arranged in the heat preservation shell; the gas inlet of the gas-liquid separator is connected with a flue gas inlet pipeline, the gas outlet is connected with a flue gas outlet pipeline, and the liquid outlet is connected with a condensate discharging pipeline; the flue gas outlet pipeline is provided with a three-way electromagnetic valve and is communicated with the flue gas inlet pipeline through the three-way electromagnetic valve; the flue gas outlet pipeline is also provided with a moisture detector which is positioned on the flue gas outlet pipeline between the three-way electromagnetic valve and the gas outlet of the gas-liquid separator; the output end of the moisture detector is connected with the control end of the three-way electromagnetic valve; a liquid level detector and a condensate discharge pump are sequentially arranged on the condensate discharge pipeline along the liquid outflow direction, and the output end of the liquid level detector is connected with the control end of the condensate discharge pump; the input end of the control unit is connected with the temperature controller, and the output end of the control unit is connected with the refrigerating system.
Description
Technical Field
The invention relates to the technical field of coal-fired flue gas environmental protection, in particular to a flue gas dewatering system and a flue gas dewatering method for flue gas detection.
Background
The flue gas discharged by coal-fired power plants and chemical plants contains a large amount of water, the current relevant environmental protection departments of China have strict requirements on the discharge concentration of each pollutant in the flue gas, and the coal-fired power plants and the chemical plants are required to carry out real-time online monitoring on the discharge concentration of each pollutant in the tail flue gas and bring real-time measurement data into CEMS. Most of monitoring devices have an optical principle, however, the measurement devices developed based on the optical principle have strict requirements on the water content in the monitored flue gas, and the presence of water not only interferes the measurement process, greatly affects the accuracy of the measurement result, but also damages the instrument. And carry out the long-time continuous operation of continuous real-time on-line monitoring requirement monitoring instrument to coal fired power plant and chemical plant's afterbody flue gas, require to get into the flue gas moisture content of instrument extremely high, dewatering equipment on the market at present, most dewatering performance is not good, or can not automatic continuous dewatering for a long time, or the partial flue gas in the system can be taken away to the dewatering in-process, causes measuring error.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the flue gas dewatering system and the flue gas dewatering method for flue gas detection, which are simple to operate, good in dewatering performance, capable of effectively removing water in flue gas, ensuring the accuracy of a measurement result and capable of continuously, efficiently and automatically dewatering for a long time.
The invention is realized by the following technical scheme:
a flue gas dewatering system for flue gas detection comprises a control unit, a heat insulation shell, a gas-liquid separator, a temperature controller and a refrigerating system, wherein the gas-liquid separator, the temperature controller and the refrigerating system are arranged in the heat insulation shell; the gas inlet of the gas-liquid separator is connected with a flue gas inlet pipeline, the gas outlet is connected with a flue gas outlet pipeline, and the liquid outlet is connected with a condensate discharging pipeline; the other ends of the smoke inlet pipeline, the smoke outlet pipeline and the condensate discharging pipeline extend out of the heat-insulating shell;
the smoke outlet pipeline is provided with a three-way electromagnetic valve and is communicated with the smoke inlet pipeline through the three-way electromagnetic valve; the flue gas outlet pipeline is also provided with a moisture detector and is positioned on the flue gas outlet pipeline between the three-way electromagnetic valve and the gas outlet of the gas-liquid separator; the output end of the moisture detector is connected with the control end of the three-way electromagnetic valve;
the condensate discharging pipeline is sequentially provided with a liquid level detector and a condensate discharging pump along the liquid outflow direction, and the output end of the liquid level detector is connected with the control end of the condensate discharging pump;
the input end of the control unit is connected with the temperature controller, and the output end of the control unit is connected with the refrigerating system.
Preferably, the gas-liquid separator is one or more in series; when a plurality of gas-liquid separators are connected in series, the gas outlet of the previous gas-liquid separator is connected with the gas inlet of the next gas-liquid separator through a pipeline; the liquid outlet of each gas-liquid separator is connected to the condensate discharge pipe after being merged by the merging pipe.
Preferably, a filter is arranged on the flue gas inlet pipeline; the filter is positioned between the three-way electromagnetic valve connecting port on the flue gas inlet pipeline and the gas-liquid separator.
Preferably, the refrigerating system adopts Peltier refrigeration or compressor refrigeration.
Preferably, the liquid level detector adopts a static pressure liquid level meter, a liquid level transmitter, a liquid level sensor or a water level sensor.
Preferably, the condensate discharge pump is one of a pulse pump, a peristaltic pump and a pipeline pump.
A flue gas water removal method for flue gas detection comprises the following steps:
step 1, starting a water removal system through a control unit, controlling the temperature in the water removal system to be 0-4 ℃ through a refrigeration system and a temperature controller, reducing the temperature of water-containing flue gas after the water-containing flue gas enters the water removal system through a flue gas inlet pipeline, and condensing water vapor in the flue gas into small water drops;
step 2, carrying out gas-liquid separation on the condensed water droplets through a gas-liquid separator;
the separated gas is detected by a humidity detector to reach the standard and is directly discharged through a flue gas outlet pipeline; if the smoke water content does not reach the standard, the smoke is sent into the gas-liquid separator again for water removal again through a three-way electromagnetic valve conversion channel until the smoke water content reaches the standard and is discharged;
the separated liquid enters a converging pipeline at the lower part of the gas-liquid separator to be converged, and when the liquid level exceeds the liquid level indicated by the liquid level detector, a condensate discharging pump is started to discharge the condensate through a condensate discharging pipeline; when the liquid level is lower than the liquid level designated by the liquid level detector, the condensate discharging pump stops working; finally, the continuous on-line water removal operation of the flue gas is completed.
Preferably, the flue gas inlet pipeline is also provided with a filter for filtering obvious solid impurities in the flue gas.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the invention, the control unit for controlling the temperature of the system is arranged in the water removal system, manual auxiliary operation is not needed, the moisture detector is arranged to independently control the three-way valve, once the moisture content of the gas is detected to be unqualified, the three-way electromagnetic valve channel is switched, and the flue gas is sent to the water removal system again, so that the water removal system can efficiently remove the moisture in the flue gas, the long-time continuous efficient automatic water removal function can be realized, 99.99% of water in the flue gas can be effectively removed, and whether the flue gas after water removal is qualified or not can be detected; through setting up the independent control of liquid level detector to condensate drainage pump, can the automatic discharge comdenstion water, the inlet pipe is long-pending full liquid when guaranteeing to start condensate drainage pump, guarantees to take away the flue gas in the system, does not influence the pressure in the system among the flowing back process.
Furthermore, through a plurality of gas-liquid separators connected in series, moisture in the flue gas can be further removed better through multi-stage separation, and the detection effect is ensured.
Furthermore, the filter arranged in front of the gas inlet of the gas-liquid separator can filter out obvious solid impurities, and the detection precision and the service life of the system are improved.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
In the figure: 1-a flue gas inlet pipeline, 2-a flue gas outlet pipeline, 3-a filter, 4-a gas-liquid separator, 5-a liquid level detector, 6-a condensate discharge pump, 7-a control unit, 8-a temperature controller, 9-a refrigeration system, 10-a condensate discharge pipeline, 11-a moisture detector, 12-a three-way electromagnetic valve and 13-a heat preservation shell.
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.
The invention relates to a flue gas dewatering system for flue gas detection, which comprises a heat-insulating shell 13, and a flue gas inlet pipeline 1, a flue gas outlet pipeline 2, a filter 3, a gas-liquid separator 4, a liquid level detector 5, a condensate discharge pump 6, a control unit 7, a temperature controller 8, a refrigerating system 9, a condensate discharge pipeline 10, a moisture detector 11 and a three-way electromagnetic valve 12 which are respectively arranged in the heat-insulating shell 13;
the gas inlet of the gas-liquid separator 4 is connected with one end of the flue gas inlet pipeline 1 extending into the heat insulation shell 13, the gas outlet of the gas-liquid separator 4 is connected with one end of the flue gas outlet pipeline 2 extending into the heat insulation shell 13, and the liquid outlet of the gas-liquid separator 4 is connected with one end of the condensate discharging pipeline 10 extending into the heat insulation shell 13; when the gas-liquid separator 4 is plural in series, the liquid outlet of each gas-liquid separator 4 is connected to the condensate discharge pipe 10 through a confluence pipe;
the flue gas inlet pipeline 1 is communicated with the flue gas outlet pipeline 2 through a three-way electromagnetic valve 12, a filter 3 is arranged on the flue gas inlet pipeline 1 behind the three-way electromagnetic valve 12, and a humidity detector 11 is arranged on the flue gas outlet pipeline 2 behind the three-way electromagnetic valve 12;
the liquid level detector 5 and the condensate discharge pump 6 are arranged in sequence on the condensate discharge pipe 10 along the condensate discharge direction.
In actual operation, firstly, the control unit 7 starts the water removal system, the refrigeration system 9 and the temperature controller 8 can be utilized to control the temperature in the water removal system to be 0-4 ℃, when water-containing flue gas enters the water removal system, obvious solid impurities are filtered out by the filter 3, and after the flue gas enters the water removal system, water vapor in the flue gas is condensed into small water drops due to the reduction of the temperature in the water removal system;
then, the condensed water droplets are subjected to gas-liquid separation by a gas-liquid separator 4; the separated gas is detected by a humidity detector 11 to reach the standard and is directly discharged through a flue gas outlet pipeline 2; if the detection is not up to the standard, the channel is changed through the three-way electromagnetic valve 12, the flue gas is sent into the gas-liquid separator 4 again for water removal again until the water content of the flue gas is up to the standard and is discharged; the liquid after liquid separation enters a converging pipeline at the lower part of the gas-liquid separator 4 to be converged, and then passes through a liquid level detector 5 arranged on a condensate discharging pipeline 11, once the liquid level exceeds the liquid level indicated by the liquid level detector 5, a condensate discharging pump 6 is started, and the condensate is discharged through a condensate discharging pipeline 10; when the liquid level is lower than the liquid level designated by the liquid level detector 5, the condensate discharge pump 6 stops working;
and finally, repeating the steps to complete the long-time continuous online flue gas dewatering operation.
The invention relates to a flue gas dewatering method for flue gas detection, which comprises the following steps:
step 1, starting a water removal system through a control unit 7, controlling the temperature in the water removal system at 0-4 ℃ through a refrigeration system 9 and a temperature controller 8, reducing the temperature of water-containing flue gas after the water-containing flue gas enters the water removal system through a flue gas inlet pipeline 1, and condensing water vapor in the flue gas into small water drops;
step 2, carrying out gas-liquid separation on the condensed water droplets through a gas-liquid separator 4;
the separated gas is detected by a humidity detector 11 to reach the standard and is directly discharged through a flue gas outlet pipeline 2; if the detection is not up to the standard, the channel is changed through the three-way electromagnetic valve 12, the flue gas is sent into the gas-liquid separator 4 again for water removal again until the water content of the flue gas is up to the standard and is discharged;
the separated liquid enters a converging pipeline at the lower part of the gas-liquid separator 4 to be converged, passes through the liquid level detector 5, and when the liquid level exceeds the liquid level indicated by the liquid level detector 5, the condensate discharging pump 6 is started to discharge the condensate through the condensate discharging pipeline 10; when the liquid level is lower than the liquid level designated by the liquid level detector 5, the condensate discharging pump 6 stops working; finally, the continuous on-line water removal operation of the flue gas is completed.
Wherein, the flue gas inlet pipeline 1 is also provided with a filter 3 for filtering the obvious solid impurities in the flue gas.
During practical operation verification, the flue gas with the inlet flue gas temperature of 180 ℃ and the flue gas water content of 4.6% is used for testing, the flue gas is introduced into the water removal system provided by the invention, the condensation water removal function is started, the water removal rate reaches 99.994%, the on-line condensation water removal can be continuously carried out, the condensed water is automatically discharged into a waste liquid barrel, and the flue gas loss is zero in the water removal process.
Claims (8)
1. A flue gas dewatering system for flue gas detection is characterized by comprising a control unit (7), a heat insulation shell (13), a gas-liquid separator (4), a temperature controller (8) and a refrigerating system (9), wherein the gas-liquid separator, the temperature controller and the refrigerating system are arranged in the heat insulation shell (13); a gas inlet of the gas-liquid separator (4) is connected with a flue gas inlet pipeline (1), a gas outlet is connected with a flue gas outlet pipeline (2), and a liquid outlet is connected with a condensate discharging pipeline (10); the other ends of the flue gas inlet pipeline (1), the flue gas outlet pipeline (2) and the condensate discharging pipeline (10) extend out of the heat-insulating shell (13);
the flue gas outlet pipeline (2) is provided with a three-way electromagnetic valve (12), and the flue gas outlet pipeline (2) is communicated with the flue gas inlet pipeline (1) through the three-way electromagnetic valve (12); the flue gas outlet pipeline (2) is also provided with a moisture detector (11) which is positioned on the flue gas outlet pipeline (2) between the three-way electromagnetic valve (12) and the gas outlet of the gas-liquid separator (4); the output end of the moisture detector (11) is connected with the control end of the three-way electromagnetic valve (12);
a liquid level detector (5) and a condensate discharge pump (6) are sequentially arranged on the condensate discharge pipeline (10) along the liquid outflow direction, and the output end of the liquid level detector (5) is connected with the control end of the condensate discharge pump (6);
the input end of the control unit (7) is connected with the temperature controller (8), and the output end is connected with the refrigerating system (9).
2. The flue gas water removal system for flue gas detection according to claim 1, wherein the gas-liquid separator (4) is one or more in series; when a plurality of gas-liquid separators (4) are connected in series, the gas outlet of the previous gas-liquid separator (4) is connected with the gas inlet of the next gas-liquid separator (4) through a pipeline; the liquid outlet of each gas-liquid separator (4) is connected to a condensate discharge line (10) after being merged by a merging line.
3. The flue gas water removal system for flue gas detection as recited in claim 1, wherein said flue gas inlet pipe (1) is provided with a filter (3); the filter (3) is positioned between a connecting port of the three-way electromagnetic valve (12) on the flue gas inlet pipeline (1) and the gas-liquid separator (4).
4. The flue gas water removal system for flue gas detection as recited in claim 1, wherein said refrigeration system (9) employs peltier refrigeration or compressor refrigeration.
5. The flue gas water removal system for flue gas detection as claimed in claim 1, wherein the liquid level detector (5) is a static pressure liquid level meter, a liquid level transmitter, a liquid level sensor or a water level sensor.
6. The flue gas water removal system for flue gas detection as recited in claim 1, wherein the condensate drain pump (6) is one of a pulse pump, a peristaltic pump and a pipeline pump.
7. A flue gas water removal method for flue gas detection, based on any one of the systems of claims 1-6, characterized by comprising the following steps:
step 1, starting a water removal system through a control unit (7), controlling the temperature in the water removal system to be 0-4 ℃ through a refrigeration system (9) and a temperature controller (8), reducing the temperature of water-containing flue gas after the water-containing flue gas enters the water removal system through a flue gas inlet pipeline (1), and condensing water vapor in the flue gas into small water drops;
step 2, carrying out gas-liquid separation on the condensed water droplets through a gas-liquid separator (4);
the separated gas is detected by a humidity detector (11) to reach the standard and is directly discharged through a flue gas outlet pipeline (2); if the smoke water content does not reach the standard, the smoke is sent into the gas-liquid separator (4) again for water removal again through a three-way electromagnetic valve (12) switching channel until the smoke water content reaches the standard and is discharged;
the separated liquid enters a converging pipeline at the lower part of the gas-liquid separator (4) to be converged, and when the liquid level exceeds the liquid level indicated by the liquid level detector (5) through the liquid level detector (5), a condensate discharging pump (6) is started to discharge the condensate through a condensate discharging pipeline (10); when the liquid level is lower than the liquid level designated by the liquid level detector (5), the condensate discharging pump (6) stops working; finally, the continuous on-line water removal operation of the flue gas is completed.
8. The flue gas water removal method for flue gas detection according to claim 7, wherein the flue gas inlet pipe (1) is further provided with a filter (3) for filtering obvious solid impurities in the flue gas.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010671093.6A CN111701406A (en) | 2020-07-13 | 2020-07-13 | Flue gas dewatering system and method for flue gas detection |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010671093.6A CN111701406A (en) | 2020-07-13 | 2020-07-13 | Flue gas dewatering system and method for flue gas detection |
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| CN203299045U (en) * | 2013-04-27 | 2013-11-20 | 深圳职业技术学院 | Detection device for diesel automobile exhaust |
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| CN208314002U (en) * | 2018-07-01 | 2019-01-01 | 深圳市诺安环境安全股份有限公司 | A kind of positive pressure explosion-proof type VOCs monitoring system |
| US20190128783A1 (en) * | 2017-10-30 | 2019-05-02 | Lanzhou Center For Oil And Gas Resources, Institute Of Geology And Geophysics, Cas | System for automatic sampling and detection of on-line gas by high-temperature and high-pressure simulator and detection method thereof |
| CN110954377A (en) * | 2019-12-03 | 2020-04-03 | 华电电力科学研究院有限公司 | SO in flue gas based on condensation separation3Detection device and method |
| CN212396328U (en) * | 2020-07-13 | 2021-01-26 | 西安热工研究院有限公司 | A flue gas dewatering system for flue gas detects |
-
2020
- 2020-07-13 CN CN202010671093.6A patent/CN111701406A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203299045U (en) * | 2013-04-27 | 2013-11-20 | 深圳职业技术学院 | Detection device for diesel automobile exhaust |
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| CN206974757U (en) * | 2017-05-08 | 2018-02-06 | 北京竹青世纪科技有限公司 | A kind of Novel flue gas samples automatic dilution device |
| US20190128783A1 (en) * | 2017-10-30 | 2019-05-02 | Lanzhou Center For Oil And Gas Resources, Institute Of Geology And Geophysics, Cas | System for automatic sampling and detection of on-line gas by high-temperature and high-pressure simulator and detection method thereof |
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