CN112915769A - Halogen injection system for collaborative mercury removal of flue gas of coal-fired power plant - Google Patents
Halogen injection system for collaborative mercury removal of flue gas of coal-fired power plant Download PDFInfo
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- CN112915769A CN112915769A CN202110275152.2A CN202110275152A CN112915769A CN 112915769 A CN112915769 A CN 112915769A CN 202110275152 A CN202110275152 A CN 202110275152A CN 112915769 A CN112915769 A CN 112915769A
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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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/79—Injecting reactants
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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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/343—Heat recovery
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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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/346—Controlling the process
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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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/64—Heavy metals or compounds thereof, e.g. mercury
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- 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 provides a halogen injection system for synergistic demercuration of flue gas of a coal-fired power plant, which realizes accurate preparation and conveying of halogen solution for synergistic demercuration, and can inject the vaporized halogen solution into a dilution air pipeline to prevent the dilution air pipeline from being corroded and prevent the dilution air pipeline from fluctuating in pressure. The halogen solution preparation module is used for placing halogen solid powder in a solution to form a finished product solution with a set concentration, the metering feeding module is used for enabling the finished product solution to flow into a liquid inflow end of the gas-liquid mixing module according to a designed dosage, the hot air generation module is used for heating external air through a denitration inlet flue and then leading the heated external air into a gas inflow end of the gas-liquid mixing module, and the gas-liquid mixing module is used for guiding the atomized solution into a dilution air pipeline at the rear part through hot air.
Description
Technical Field
The invention relates to the technical field of demercuration technology, in particular to a halogen injection system for synergistic demercuration of flue gas of a coal-fired power plant.
Background
Coal-fired power generation is one of main mercury emission sources in China, and accounts for about 40% of mercury emission in China. At present, the coal-fired power plant mainly adopts an absorbent mercury removal method and a flue gas cooperative mercury removal method to realize the removal of mercury in flue gas. The absorbent demercuration method adopts activated carbon as an absorbent to be sprayed into a flue to realize the absorption and the removal of mercury, but the cost of the activated carbon is higher, and the absorbed activated carbon is easy to cause secondary pollution. The cooperative mercury removal method is based on the existing flue gas treatment equipment, single mercury is oxidized into divalent mercury by SCR, and mercury removal is realized through ESP and FGD. But SCR has limited oxidation capability for elemental mercury, making the synergistic mercury removal less efficient. The calcium chloride is added into the coal, so that the generation of active chlorine in the combustion process can be increased, the oxidation of mercury can be effectively realized, and the efficiency of synergistic mercury removal is improved. However, the cost of adding calcium chloride into the fire coal is high, and the high-temperature corrosion of the flue is easily caused. Therefore, an efficient, stable and economical flue gas cooperative mercury removal technology is needed. Halogen is injected into the denitration dilution air pipeline, and the halogen enters the denitration reactor together with the dilution air and the ammonia gas after being mixed, so that the denitration is realized, and the cooperative demercuration is carried out, so that the oxidation of mercury can be effectively realized, and the cooperative demercuration efficiency is improved. The realization of the technology depends on how to ensure that the halogen is accurately sprayed into the dilution air pipeline, and meanwhile, the dilution air pipeline is not corroded, and the pressure of the dilution air pipeline is not fluctuated and influenced, so that the existing system cannot complete the work.
Disclosure of Invention
Aiming at the problems, the invention provides a halogen injection system for synergistic demercuration of flue gas of a coal-fired power plant, which realizes accurate preparation and transportation of halogen solution for synergistic demercuration, can inject the vaporized halogen solution into a dilution air pipeline to prevent the dilution air pipeline from being corroded and prevent the dilution air pipeline from fluctuating in pressure, carries out synergistic demercuration on the basis of ensuring the safety of the original denitration system, and simultaneously reduces the energy consumption of an injection device by using the waste heat of a denitration inlet flue, thereby being an efficient, stable and economic flue gas synergistic demercuration halogen injection system.
A halogen injection system for coal fired power plant flue gas is mercury removal in coordination which characterized in that: the halogen solution preparation module is used for placing halogen solid powder in a solution to form a finished product solution with a set concentration, the metering feeding module is used for enabling the finished product solution to flow into a liquid inflow end of the gas-liquid mixing module according to a designed dosage, the hot air generation module is used for heating external air through a denitration inlet flue and then leading the heated external air into a gas inflow end of the gas-liquid mixing module, and the gas-liquid mixing module is used for guiding the atomized solution into a dilution air pipeline at the rear part through hot air.
It is further characterized in that:
the halogen solution preparation module comprises a halogen solid powder storage tank, a feeding controller, a stirring mixer, a solution storage tank, an electric dosing pump and a finished product solution storage tank, wherein the solid powder storage tank is positioned above the solution storage tank, an outlet of the solid powder storage tank is connected with the feeding controller and then is connected to a solid powder feeding port of the solution storage tank, solid powder flows into the solution storage tank under the action of gravity, the solid powder is stirred and mixed by the stirring mixer to prepare halogen solution with required concentration, a liquid outlet of the solution storage tank is connected with a feeding port of the electric dosing pump, and a discharge port of the electric dosing pump is introduced into a liquid inlet of the finished product solution storage tank through a pipeline;
a liquid outlet of the solution storage tank is connected with the stop valve and then connected with a material inlet of the electric medicine feeding pump;
the metering feeding module comprises a delivery pump, a reflux valve, a low-range flow regulating valve, a high-range flow regulating valve, a low-range flow meter and a high-range flow meter, a liquid outlet of the finished product solution storage tank is connected with the delivery pump, an output pipeline of the delivery pump is connected with three branch pipelines, a first pipeline is connected with the reflux valve and then is connected to a reflux port of the finished product solution storage tank, a second pipeline is sequentially connected with the low-range flow regulating valve and the low-range flow meter and then is merged into an output pipeline, and a third pipeline is sequentially connected with the high-range flow regulating valve and the high-range flow meter and then is merged into the output; when the needed halogen solution is less, the needed liquid containing amount is adjusted by a low-range flow adjusting valve, the real-time flow is displayed by a low-range flow meter, and the redundant solution flows back to a finished product solution storage tank by a return valve; when the needed halogen solution is more, the needed liquid containing amount is adjusted by the high-range flow adjusting valve, the real-time flow is displayed by the high-range flow meter, and the redundant solution flows back to the finished product solution storage tank through the return valve;
the hot air generation module comprises an air blower, the air blower sends cold air into the denitration inlet flue through a cold air pipeline and then leads out the cold air through a first hot air input pipeline, and the first hot air input pipeline is connected with the gas inflow end of the gas-liquid mixing module;
a first heat tracing band is arranged in the first hot air input pipeline to ensure the temperature of hot air passing through the denitration inlet flue;
the gas-liquid mixing module is specifically a mixer, the mixer comprises a mixer shell, the mixer shell comprises a liquid inflow end, a gas inflow end and a mixed outflow end, a plurality of solution atomizing spray heads are arranged at the outlet position of the liquid inflow end, the solution atomizing spray heads atomize liquid and then place the atomized liquid in the inner cavity of the mixer shell, the gas inflow end mixes the atomized liquid and then blows the mixed liquid to the mixed outflow end, the mixed outflow end is connected to the dilution air pipeline through a second hot air output pipeline, and a second heat tracing band is integrated in the second hot air output pipeline to ensure that the temperature of mixed hot air entering the dilution air pipeline is not lower than 150 ℃;
the periphery of the mixer shell is also coated with a heating furnace tile to ensure that the temperature of hot air reaches a set range;
a drain valve structure is also arranged at the bottom of the mixer shell;
the cold air pipeline is provided with a cold air section pressure gauge, the second hot air output pipeline is provided with a hot air section pressure gauge, and the hot air section pressure gauge and the cold air section pressure gauge respectively detect the pressure in the corresponding pipelines in real time to ensure that the air speed meets the set requirement.
After adopting above-mentioned technical scheme, can realize cooperating accurate preparation and the transport of demercuration with halogen solution, can spray into dilution wind pipeline after the halogen solution vaporization simultaneously, prevent to dilute the wind pipeline and cause the corruption, prevent to dilute wind pipeline pressure fluctuation, on the security basis of guaranteeing original deNOx systems, carry out the demercuration in coordination, utilize denitration entry flue waste heat to reduce injection apparatus energy consumption simultaneously, be a high-efficient, stable, economic flue gas in coordination demercuration halogen injection apparatus.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic structural view of a mixer of the present invention;
the names corresponding to the sequence numbers in the figure are as follows:
the system comprises a halogen solution preparation module 100, a metering feeding module 200, a hot air generation module 300, a gas-liquid mixing module 400, a denitration inlet flue 500 and a dilution air pipeline 600
The device comprises a halogen solid powder storage tank 1, a feeding controller 2, a stirring mixer 3, a solution storage tank 4, a stop valve 5, an electric medicine feeding pump 6, a finished product solution storage tank 7, a delivery pump 8, a reflux valve 9, a low-range flow regulating valve 10, a high-range flow regulating valve 11, a low-range flow meter 12, a high-range flow meter 13, a mixer 14, a hot air section pressure gauge 15, a first heat tracing band 16, an air blower 17, a cold air section pressure gauge 18, a second heat tracing band 19, a solution atomizing nozzle 20, a heating furnace tile 21, a mixer shell 22, a drain valve structure 23, a cold air pipeline 24, a first hot air input pipeline 25 and a second hot air output pipeline 26.
Detailed Description
A halogen injection system for coal-fired power plant flue gas cooperative demercuration is disclosed in the figures 1 and 2: the halogen solution preparation module 100 is used for placing halogen solid powder into a solution to form a finished product solution with a set concentration, the metering feeding module 200 is used for enabling the finished product solution to flow into a liquid inflow end of the gas-liquid mixing module 400 according to a designed dosage, the hot air generation module 300 is used for heating external air through a denitration inlet flue 500 and then introducing the heated external air into a gas inflow end of the gas-liquid mixing module 400, and the gas-liquid mixing module 400 is used for guiding the atomized solution into a dilution air pipeline 600 at the rear part through hot air.
The halogen solution preparation module 100 comprises a halogen solid powder storage tank 1, a feeding controller 2, a stirring mixer 3, a solution storage tank 4, an electric dosing pump 6 and a finished product solution storage tank 7, wherein the solid powder storage tank 1 is positioned above the solution storage tank 4, an outlet of the solid powder storage tank 1 is connected with the feeding controller 2 and then is connected to a solid powder feeding port of the solution storage tank 4, solid powder flows into the solution storage tank 4 under the action of gravity, the halogen solution with the required concentration is prepared by stirring and mixing through the stirring mixer 3, a liquid outlet of the solution storage tank 4 is connected with a feeding port of the electric dosing pump 6, and a discharge port of the electric dosing pump 6 is introduced into a liquid inlet of the finished product solution storage tank 7 through a pipeline;
a liquid outlet of the solution storage tank 4 is connected with a stop valve 5 and then connected with a material inlet of an electric medicine feeding pump 6;
the metering feeding module 200 comprises a delivery pump 8, a reflux valve 9, a low-range flow regulating valve 10, a high-range flow regulating valve 11, a low-range flow meter 12 and a high-range flow meter 13, wherein a liquid outlet of the finished product solution storage tank 7 is connected with the delivery pump 8, an output pipeline of the delivery pump 8 is connected with three branch pipelines, a first pipeline is connected with a reflux port of the finished product solution storage tank 7 after being connected with the reflux valve 9, a second pipeline is connected with the low-range flow regulating valve 10 and the low-range flow meter 12 in sequence and then is converged into the output pipeline, and a third pipeline is connected with the high-range flow regulating valve 11 and the high-range flow meter 13 in sequence; when the needed halogen solution is less, the needed liquid containing amount is adjusted by the low-range flow adjusting valve 10, the real-time flow is displayed by the low-range flow meter 12, and the redundant solution flows back to the finished product solution storage tank 7 through the return valve 9; when the needed halogen solution is more, the needed liquid containing amount is adjusted by the high-range flow adjusting valve 11, the real-time flow is displayed by the high-range flow meter 13, and the redundant solution flows back to the finished product solution storage tank 7 through the return valve 9;
the hot air generation module 300 comprises an air blower 17, the air blower 17 sends cold air into the denitration inlet flue 500 through the cold air pipeline 24 and then leads out through a first hot air input pipeline 25, and the first hot air input pipeline 25 is connected with the air inflow end of the gas-liquid mixing module 400;
a first heat tracing band 16 is arranged in the first hot air input pipeline 25 to ensure the temperature of the hot air passing through the denitration inlet flue 500;
the gas-liquid mixing module 400 is specifically a mixer 14, the mixer 14 comprises a mixer shell 22, the mixer shell 22 comprises a liquid inflow end, a gas inflow end and a mixed outflow end, a plurality of solution atomizing spray heads 20 are arranged at the outlet positions of the liquid inflow end, the solution atomizing spray heads 20 atomize the liquid and then place the atomized liquid in the inner cavity of the mixer shell 22, the gas inflow end mixes the atomized liquid and then blows the mixed liquid to the mixed outflow end, the mixed outflow end is connected to a dilution air pipeline 600 through a second hot air output pipeline 26, a second heat tracing band 19 is integrated in the second hot air output pipeline 26, and the temperature of the mixed hot air entering the dilution air pipeline 600 is not lower than 150 ℃;
the periphery of the mixer shell 22 is also coated with a heating furnace tile 21 to ensure that the temperature of hot air reaches a set range;
the bottom of the mixer shell 22 is also provided with a drain valve structure 23;
the cold air pipeline 24 is provided with a cold air section pressure gauge 18, the second hot air output pipeline 26 is provided with a hot air section pressure gauge 15, and the hot air section pressure gauge 15 and the cold air section pressure gauge 18 respectively detect the pressure in the corresponding pipelines in real time to ensure that the air speed meets the set requirement.
It can realize cooperating the accurate preparation and the transport of demercuration with halogen solution, can spray into dilution wind pipeline after the halogen solution vaporization simultaneously, prevents to dilute the wind pipeline and causes the corruption, prevents to dilute wind pipeline pressure fluctuation, on the security basis of guaranteeing original deNOx systems, carries out cooperation demercuration, utilizes denitration entry flue waste heat to reduce injection apparatus energy consumption simultaneously, is a high-efficient, stable, economic flue gas in coordination demercuration halogen injection apparatus.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. A halogen injection system for coal fired power plant flue gas is mercury removal in coordination which characterized in that: the halogen solution preparation module is used for placing halogen solid powder in a solution to form a finished product solution with a set concentration, the metering feeding module is used for enabling the finished product solution to flow into a liquid inflow end of the gas-liquid mixing module according to a designed dosage, the hot air generation module is used for heating external air through a denitration inlet flue and then leading the heated external air into a gas inflow end of the gas-liquid mixing module, and the gas-liquid mixing module is used for guiding the atomized solution into a dilution air pipeline at the rear part through hot air.
2. The halogen injection system for synergistic mercury removal from coal fired power plant flue gas as claimed in claim 1, wherein: halogen solution configuration module includes halogen solid powder storage tank, feed controller, stirring mixer, solution storage tank, electronic medicine pump, finished product solution storage tank, the solid powder storage tank is located solution storage tank top, the exit linkage of solid powder storage tank be connected to behind the feed controller the solid powder feed inlet of solution storage tank, solid powder flows into the solution storage tank through the action of gravity, stirs the halogen solution of mixing preparation required concentration via the stirring mixer, the liquid outlet of solution storage tank is connected the pan feeding mouth of electronic medicine pump, the discharge gate of electronic medicine pump lets in through the pipeline the inlet of finished product solution storage tank.
3. The halogen injection system for synergistic mercury removal from coal fired power plant flue gas as claimed in claim 2, wherein: and the liquid outlet of the solution storage tank is connected with the feed inlet of the electric medicine feeding pump after being connected with the stop valve.
4. The halogen injection system for synergistic mercury removal from coal fired power plant flue gas as claimed in claim 1, wherein: the metering feeding module comprises a delivery pump, a reflux valve, a low-range flow regulating valve, a high-range flow regulating valve, a low-range flow meter and a high-range flow meter, a liquid outlet of the finished product solution storage tank is connected with the delivery pump, an output pipeline of the delivery pump is connected with three branch pipelines, a first pipeline is connected with a reflux port of the finished product solution storage tank after being connected with the reflux valve, a second pipeline is connected with the low-range flow regulating valve and the low-range flow meter in sequence and then is converged into an output pipeline, and a third pipeline is connected with the high-range flow regulating valve and the high-range flow meter in sequence and then is converged into the.
5. The halogen injection system for synergistic mercury removal from coal fired power plant flue gas as claimed in claim 4, wherein: the hot air generation module comprises an air blower, the air blower sends cold air into the denitration inlet flue through a cold air pipeline and then leads out the cold air through a first hot air input pipeline, and the first hot air input pipeline is connected with the gas inflow end of the gas-liquid mixing module.
6. The halogen injection system for synergistic mercury removal from coal fired power plant flue gas as claimed in claim 5, wherein: a first heat tracing band is arranged in the first hot air input pipeline.
7. The halogen injection system for synergistic mercury removal from coal fired power plant flue gas as claimed in claim 5, wherein: the gas-liquid mixing module specifically is the blender, the blender includes the blender casing, the blender casing includes liquid inflow end, gas inflow end, mixed outflow end, the exit position of liquid inflow end is provided with a plurality of solution atomizer, the inner chamber of blender casing is arranged in to solution atomizer after with liquid atomization, gas inflow end blows to mixed outflow end behind the liquid mixture of atomizing, mixed outflow end is connected to through the hot-blast output pipeline of second in the dilution wind pipeline, the integration has the second to accompany the tropical in the hot-blast output pipeline of second.
8. The halogen injection system for synergistic mercury removal from coal fired power plant flue gas as claimed in claim 7, wherein: the periphery of the mixer shell is also coated with a heating furnace tile.
9. The halogen injection system for synergistic mercury removal from coal fired power plant flue gas as claimed in claim 7, wherein: and a drain valve structure is also arranged at the bottom of the mixer shell.
10. The halogen injection system for synergistic mercury removal from coal fired power plant flue gas as claimed in claim 7, wherein: the cold air pipeline is provided with a cold air section pressure gauge, the second hot air output pipeline is provided with a hot air section pressure gauge, and the hot air section pressure gauge and the cold air section pressure gauge respectively detect the pressure in the corresponding pipelines in real time.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110275152.2A CN112915769A (en) | 2021-03-15 | 2021-03-15 | Halogen injection system for collaborative mercury removal of flue gas of coal-fired power plant |
| PCT/CN2021/115081 WO2022193557A1 (en) | 2021-03-15 | 2021-08-27 | Halogen injection system for synergistic mercury removal of flue gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110275152.2A CN112915769A (en) | 2021-03-15 | 2021-03-15 | Halogen injection system for collaborative mercury removal of flue gas of coal-fired power plant |
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| CN112915769A true CN112915769A (en) | 2021-06-08 |
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| CN202110275152.2A Pending CN112915769A (en) | 2021-03-15 | 2021-03-15 | Halogen injection system for collaborative mercury removal of flue gas of coal-fired power plant |
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| WO (1) | WO2022193557A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114192304A (en) * | 2021-12-21 | 2022-03-18 | 重庆军通汽车有限责任公司 | Spraying robot |
| WO2022193557A1 (en) * | 2021-03-15 | 2022-09-22 | 苏州西热节能环保技术有限公司 | Halogen injection system for synergistic mercury removal of flue gas |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4838579B2 (en) * | 2005-12-21 | 2011-12-14 | 三菱重工業株式会社 | Mercury removal system and mercury removal method |
| DE112010004413B4 (en) * | 2009-11-16 | 2016-12-15 | Ihi Corporation | Method and system for removing mercury |
| CN202315660U (en) * | 2011-09-21 | 2012-07-11 | 中国华能集团清洁能源技术研究院有限公司 | High-efficiency low-cost mercury pollution control system for coal-fired power plant |
| CN102989282A (en) * | 2012-11-30 | 2013-03-27 | 东方电气集团东方锅炉股份有限公司 | Method and device for collaborative removal of mercury in flue gas |
| CN204275782U (en) * | 2014-11-14 | 2015-04-22 | 华能国际电力股份有限公司 | A kind of NOx based on SNCR-SCR coupling combines with mercury and removes device |
| CN105268300B (en) * | 2015-11-11 | 2017-11-14 | 中国华能集团公司 | A kind of joint demercuration method and device based on SNCR |
| CN112915769A (en) * | 2021-03-15 | 2021-06-08 | 苏州西热节能环保技术有限公司 | Halogen injection system for collaborative mercury removal of flue gas of coal-fired power plant |
-
2021
- 2021-03-15 CN CN202110275152.2A patent/CN112915769A/en active Pending
- 2021-08-27 WO PCT/CN2021/115081 patent/WO2022193557A1/en active Application Filing
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022193557A1 (en) * | 2021-03-15 | 2022-09-22 | 苏州西热节能环保技术有限公司 | Halogen injection system for synergistic mercury removal of flue gas |
| CN114192304A (en) * | 2021-12-21 | 2022-03-18 | 重庆军通汽车有限责任公司 | Spraying robot |
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| WO2022193557A1 (en) | 2022-09-22 |
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