CN108568210B - Smoke reheating white smoke eliminating process and method for cooperating with CO low-temperature denitration - Google Patents
Smoke reheating white smoke eliminating process and method for cooperating with CO low-temperature denitration Download PDFInfo
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- CN108568210B CN108568210B CN201810319969.3A CN201810319969A CN108568210B CN 108568210 B CN108568210 B CN 108568210B CN 201810319969 A CN201810319969 A CN 201810319969A CN 108568210 B CN108568210 B CN 108568210B
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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
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8628—Processes characterised by a specific catalyst
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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
- B01D53/02—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 adsorption, e.g. preparative gas chromatography
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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
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
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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
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/204—Carbon monoxide
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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 process and a method for reheating and eliminating white smoke in flue gas in coordination with CO low-temperature denitration. The flue gas after the desulfurizing tower is reheated, so that the phenomenon of large white smoke at the outlet of a chimney is eliminated, the removal of nitrogen oxides in the flue gas at low temperature (130-150 ℃) is realized, and the ultra-clean emission standard of the nitrogen oxides is reached. The whole process is positioned behind the wet desulphurization tower, the sulfur inactivation of the catalyst is avoided, the steps are simple, the operation is convenient, and the practicability is strong.
Description
Technical Field
The invention belongs to the field of smoke reheating and white smoke elimination, and particularly relates to a smoke reheating and white smoke elimination process and method for coordinating CO low-temperature denitration.
Background
After GGH is cancelled, wet flue gas is directly discharged into the atmosphere from a chimney after wet desulphurization in a coal-fired power plant, when the wet flue gas is contacted with ambient air with lower temperature, the temperature of the flue gas is reduced, contained water vapor is supersaturated and condensed, and condensed water drops refract and scatter light, so that smoke plume presents white or grey white color, namely 'wet smoke plume' (commonly called 'big white smoke', 'white smoke plume', 'colored smoke plume', and the like), and the appearance of the market is influenced. Relevant environmental protection policies are issued in Shanghai city, Tianjin city, Zhejiang province, Shandong province and the like in China, and the coal-fired power plant is required to adopt smoke temperature control and other effective measures to eliminate the phenomena of 'gypsum rain', 'colored smoke plume' and the like. According to the principle, the technical route for eliminating the big white smoke comprises smoke reheating, smoke condensation and smoke reheating and condensation, wherein the MGGH smoke reheating method is the most common and most successful technology.
MGGH is a hydrophily type flue gas heat exchanger, namely, a tubular heat exchanger is respectively added in the front and the back of a desulfurizing tower, medium circulating water is arranged in a heat exchanger tube, the circulating water absorbs flue gas heat in the heat exchanger in the front of the desulfurizing tower, heat is released in the heat exchanger in the back of the desulfurizing tower to heat low-temperature flue gas in the back of the desulfurizing tower, the temperature of the flue gas is increased to 75-80 ℃, and the phenomenon of big white smoke can be eliminated. However, in the mode, because two stages of heat exchange are added, the smoke resistance can be greatly increased, and the output of the induced draft fan is increased; the water is used as a heat exchange medium, so that the heat exchange temperature difference is reduced, the heat exchange area and the equipment volume are increased under the same heat exchange quantity, and enough site space is needed at the position of the desulfurizing tower; and the temperature of the flue gas before the desulfurizing tower is reduced to be below the acid dew point, so that the acid in the flue gas is condensed, and the risk of equipment corrosion is increased.
The emission concentration of nitrogen oxide required by the emission limit value of atmospheric pollutants of coal-fired power plants in China is controlled at 50mg/m of ultralow emission3Selective catalytic reduction (NH) technique using ammonia as reducing agent3SCR) is the most, most mature and most effective flue gas denitration technology applied in the world, has high denitration efficiency, high maturity and reliability and strong adaptability, and is particularly suitable for coal-fired units in areas with variable coal quality, frequent unit load change and sensitive air quality requirement. However, in the SCR technology, ammonia is sprayed as a reducing agent, so that a pipeline is corroded, and improper control is easy to cause ammonia escape, secondary pollution is generated, and an air preheater is blocked; the used catalyst is mostly a vanadium-titanium catalyst, has high biotoxicity and great threat to the ecological environment, and is difficult to regenerate after poisoning and inactivation.
The blast furnace gas of the steel plant contains a large amount of CO, the high-efficiency denitration by taking the CO as a reducing agent has low denitration cost, does not generate other harmful components, has strong adaptability to the temperature and the components of the flue gas, and is particularly suitable for the industrial industries which take carbon substances as fuels, such as power plants, the ferrous metallurgy industry and the like.
Disclosure of Invention
In order to overcome the defects, the invention provides a process and a method for removing white smoke by reheating flue gas in coordination with CO low-temperature denitration, which eliminate the phenomenon of large white smoke at the outlet of a chimney by reheating the flue gas, realize the removal of nitric oxide in the flue gas at low temperature (130-150 ℃) and reach the ultra-clean emission standard of the nitric oxide.
In order to achieve the purpose, the invention adopts the following technical scheme:
a flue gas reheat white smoke abatement system in conjunction with low temperature CO denitration, the system comprising: the system comprises a wet desulfurization tower, a gas-gas plate type heat exchanger, a flue gas heater and a rotary low-temperature denitration reactor; and the flue behind the rotary low-temperature denitration reactor is also connected with the gas-gas plate type heat exchanger.
The catalyst of the rotary low-temperature denitration reactor adopts non-noble metal catalysts such as Fe or Cu, so that the rotary low-temperature denitration reactor is arranged behind the desulfurization device in order to avoid poisoning of the catalyst caused by sulfur-containing flue gas; meanwhile, the flue gas discharged by the rotary low-temperature denitration reactor can exchange heat with the desulfurized flue gas in the gas-gas plate heat exchanger, so that the heat energy of the reheated white smoke and the high-temperature flue gas of the wet flue gas after wet desulphurization can be fully utilized.
Preferably, the rotary low-temperature denitration reactor is a rotary HC-SCR denitration reactor CN103908892A or a circulating fluidized bed reactor.
Preferably, the rotary low-temperature denitration reactor is divided into a nitrogen oxide adsorption zone 4-1 and a CO reduction zone 4-2, and the circulating fluidized bed reactor is divided into an ascending zone and a descending zone.
The invention also provides a coal-fired power plant, particularly a tail gas treatment system suitable for steel plants, comprising any one of the systems.
The existing rotary HC-SCR denitration reactor adopts methane (CH)4) Ethane (C)2H6) Ethylene (C)2H4) Propane (C)3H8) Propylene (C)3H6) Butane (C)4H10) Butene (C)4H8) Etc. series of hydrocarbons (C)nHm) One or a combination of several of the above materials is used as a reducing agent, but the research of the application finds that: when the system is used for treating the tail gas of the steel plant, the CO can be used as a reducing agent to effectively improve the denitration efficiency of the system because the tail gas contains more CO.
The invention also provides a method for reheating and eliminating white smoke in flue gas in cooperation with CO low-temperature denitration, which comprises the following steps:
the flue gas after wet desulphurization is heated to 130-150 ℃ by a flue gas heater after heat exchange by a gas-gas plate heat exchanger;
introducing the heated flue gas into a rotary low-temperature denitration reactor for low-temperature denitration;
and (4) exchanging heat of the flue gas subjected to low-temperature denitration by a gas-gas plate heat exchanger, and discharging.
Preferably, the temperature of the flue gas after wet desulphurization is 50-60 ℃.
Preferably, the temperature of the flue gas after wet desulphurization after heat exchange by the gas-gas plate heat exchanger is 100-120 ℃.
Preferably, the temperature of the low-temperature denitration is 130-150 ℃.
Preferably, the temperature of the flue gas subjected to low-temperature denitration after heat exchange by the gas-gas plate heat exchanger is 70-80 ℃.
Preferably, the heat source of the heater is high-temperature hot water at 150 ℃ or above, steam extracted by a steam turbine or fuel gas.
The invention has the advantages of
(1) The smoke is reheated, the smoke is heated to 70-80 ℃ from 50-60 ℃ in a wet desulphurization tower and discharged, and white smoke is eliminated;
(2) in the adsorption zone of the low-temperature denitration reactor, NO in the flue gas is oxidized and attached to the surface of the catalyst, and in the reduction zone, NO is adsorbed on the surface of the catalystxIs reduced to N by CO2The catalyst is recycled, and the nitrogen oxides in the flue gas are removed to achieve ultra-cleanEmission standard;
(3) the denitration device is positioned after desulfurization, so that the sulfur inactivation of the catalyst is avoided, and the service life of the catalyst is prolonged;
(4) the method is simple, high in denitration efficiency, strong in practicability and easy to popularize, and white smoke is eliminated after the smoke is reheated.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
Fig. 1 shows a process for reheating and removing white smoke from flue gas in cooperation with low-temperature denitration of CO, wherein: 1-a wet desulfurization tower; 2-gas plate heat exchanger; 3-a flue gas heater; 4-a low-temperature denitration reactor; 4-1: an adsorption zone; 4-2: a reduction zone.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The present invention will be further described with reference to specific examples.
A process and a method for removing white smoke by reheating flue gas in cooperation with CO low-temperature denitration are disclosed, wherein the phenomenon of large white smoke at the outlet of a chimney is eliminated by reheating the flue gas, the removal of nitrogen oxides in the flue gas at low temperature (130-150 ℃) is realized, and the ultra-clean emission standard of the nitrogen oxides is achieved.
The process comprises the following steps: in the wet processA flue behind the desulfurizing tower 1 is sequentially connected with a gas-gas plate type heat exchanger 2, a flue gas heater 3 and a rotary low-temperature denitration reactor 4, and the low-temperature denitration reactor 4 is divided into a nitrogen oxide adsorption area 4-1 and a CO reduction area 4-2. The flue gas in the flue after the induced draft fan enters from the flue gas inlet of the wet desulphurization tower 1, the sulfur oxides in the flue gas are removed by wet desulphurization, the flue gas enters the gas-gas plate heat exchanger 2 from the flue gas outlet of the wet desulphurization tower 1, the heat source of the gas-gas plate heat exchanger 2 is from the flue gas at about 130 ℃ in the just-operating stage of the system, the desulfurized wet flue gas is heated to 100 plus-materials of 120 ℃, the flue gas at 100 plus-materials of 120 ℃ enters the flue gas heater 3 to be further heated to 130 plus-materials of 150 ℃, the heat source is from high-temperature hot water, steam extraction of a steam turbine or fuel gas at 150 ℃ or above, the flue gas at 130 plus-materials of 150 ℃ enters the adsorption zone 4-1 of the low-temperature denitration reactor 4, and the optimum reaction temperature of the low-temperature denitration reactor 4 is 130-150 ℃, and the flue gas2Reaction, reaction products are adsorbed on the surface of the catalyst, and when the catalyst rotates to a reduction zone 4-2, nitrogen oxides are reduced into N by CO2The activity of the catalyst is not affected. The flue gas with the temperature of 130-150 ℃ at the outlet of the low-temperature denitration reactor 4 enters the gas-gas plate type heat exchanger 2 to be used as a heat source for heating the desulfurized wet flue gas, and the wet flue gas is cooled to 70-80 ℃ and is discharged from a chimney. In the system operation stage, the smoke with the temperature of 130 ℃ does not need to be additionally extracted, and the external heat source is only the heat source with the temperature of 150 ℃ or above for heating the smoke heater.
Example 1
A gas-gas plate type heat exchanger 2, a flue gas heater 3 and a rotary low-temperature denitration reactor 4 are sequentially connected to a flue behind a wet desulfurization tower 1 of a coal-fired power plant, and the low-temperature denitration reactor 4 is divided into a nitrogen oxide adsorption area 4-1 and a CO reduction area 4-2. The flue gas in the flue after the induced draft fan enters from the flue gas inlet of the wet desulphurization tower 1, the sulfur oxides in the flue gas are removed by wet desulphurization, the flue gas enters the gas-gas plate heat exchanger 2 from the flue gas outlet of the wet desulphurization tower 1, the heat source of the gas-gas plate heat exchanger 2 is from the flue gas at 130 ℃ in the just-operating stage of the system, the desulfurized wet flue gas is heated to 100 plus-heat value of 120 ℃, the flue gas at 100 plus-heat value of 120 ℃ enters the flue gas heater 3 and is further heated to 130 plus-heat value of 150 ℃, the heat source is from high-temperature hot water at 150 ℃, steam extraction of a steam turbine or fuel gas, 130-1The flue gas with the temperature of 50 ℃ enters an adsorption zone 4-1 of a low-temperature denitration reactor 4, the optimal reaction temperature of the low-temperature denitration reactor 4 is 130-150 ℃, and the flue gas and O react in the adsorption zone 4-12Reaction, reaction products are adsorbed on the surface of the catalyst, and when the catalyst rotates to a reduction zone 4-2, nitrogen oxides are reduced into N by CO2The activity of the catalyst is not affected. The flue gas with the temperature of 130 ℃ at the outlet of the low-temperature denitration reactor 4 enters the gas-gas plate heat exchanger 2 to be used as a heat source for heating the desulfurized wet flue gas, and the flue gas is cooled to 70-80 ℃ and then is discharged from a chimney. In the system operation stage, the smoke with the temperature of 130 ℃ does not need to be additionally extracted, and the external heat source is only the heat source with the temperature of 150 ℃ or above for heating the smoke heater.
Example 2
A gas-gas plate type heat exchanger 2, a flue gas heater 3 and a circulating fluidized bed reactor 4 are sequentially connected to a flue behind a wet desulphurization tower 1 of a coal-fired power plant, the circulating fluidized bed reactor 4 is divided into an ascending area and a descending area, catalyst bed materials are loaded in the bed, and the bed materials circulate in the ascending area and the descending area. The flue gas in the flue after the induced draft fan enters from the flue gas inlet of the wet desulphurization tower 1, the sulfur oxides in the flue gas are removed by wet desulphurization, the flue gas enters the gas-gas plate heat exchanger 2 from the flue gas outlet of the wet desulphurization tower 1, the heat source of the gas-gas plate heat exchanger 2 is from the flue gas at 130 ℃ in the just-operating stage of the system, the desulfurized wet flue gas is heated to 100 plus-material temperature of 120 ℃, the flue gas at 100 plus-material temperature of 120 ℃ enters the flue gas heater 3 to be further heated to 130 plus-material temperature of 150 ℃, the heat source is from high-temperature hot water at 150 ℃, steam extraction of a steam turbine or fuel gas, the flue gas at 130 plus-material temperature of 150 ℃ enters the descending zone of the circulating fluidized bed reactor, because the optimal reaction temperature of the circulating fluidized bed reactor is 1302Reaction, reaction product is adsorbed on the surface of catalyst, and when the catalyst circularly enters the rising zone, CO reduces nitrogen oxide to N2The activity of the catalyst is not affected. The flue gas with the temperature of 130 ℃ at the outlet of the circulating fluidized bed reactor enters a gas-gas plate heat exchanger 2 to be used as a heat source for heating the desulfurized wet flue gas, and the wet flue gas is cooled to 70-80 ℃ and then is discharged from a chimney. In the system operation stage, the smoke with the temperature of 130 ℃ does not need to be additionally extracted, and the external heat source is only 150 ℃ or above for heating the smoke heaterThe heat source of (1).
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and equivalents can be made in the technical solutions described in the foregoing embodiments, or equivalents thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (2)
1. A flue gas reheating white smoke abatement system for coordinated CO low temperature denitration of a steel plant, the system comprising: the system comprises a wet desulfurization tower, a gas-gas plate type heat exchanger, a flue gas heater and a rotary low-temperature denitration reactor; a flue behind the wet desulfurization tower is sequentially connected with a gas-gas plate type heat exchanger, a flue gas heater and a rotary low-temperature denitration reactor, and the flue behind the rotary low-temperature denitration reactor is also connected with the gas-gas plate type heat exchanger;
the low temperature is 130-150 ℃;
the rotary low-temperature denitration reactor is divided into a nitrogen oxide adsorption area and a CO reduction area;
the catalyst of the rotary low-temperature denitration reactor is Fe or Cu.
2. A method for reheating and eliminating white smoke in flue gas in coordination with low-temperature denitration of CO is characterized by comprising the following steps: the flue gas reheating and white smoke abatement system for synergistic CO low-temperature denitration, according to claim 1, is adopted, and the flue gas subjected to wet desulphurization is heated to 130-150 ℃ through a heater after heat exchange is carried out on the flue gas through a gas-gas plate heat exchanger;
introducing the heated flue gas into a rotary low-temperature denitration reactor for low-temperature denitration;
the flue gas after low-temperature denitration is discharged after heat exchange through a gas-gas plate heat exchanger, and white smoke is eliminated;
the temperature of the flue gas after wet desulphurization is 50-60 ℃;
the temperature of the flue gas after wet desulphurization after heat exchange by the gas-gas plate heat exchanger is 100-120 ℃;
the temperature of the low-temperature denitration is 130-150 ℃;
the temperature of the flue gas subjected to low-temperature denitration after heat exchange by a gas-gas plate type heat exchanger is 70-80 ℃;
the heat source of the heater is high-temperature hot water at 150 ℃ or above, steam extracted by a steam turbine or fuel gas;
the catalyst of the rotary low-temperature denitration reactor is Fe or Cu.
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| CN109519952A (en) * | 2018-12-12 | 2019-03-26 | 河南心连心化肥有限公司 | A kind of device and plume removal methods of the removing of boiler chimney plume |
| CN109899824A (en) * | 2019-02-22 | 2019-06-18 | 桐昆集团浙江恒盛化纤有限公司 | A kind of wet desulphurization takes off white integrative chimney |
| CN114321954A (en) * | 2021-12-24 | 2022-04-12 | 山东大学 | Heating furnace regenerative catalytic reduction denitration system and method |
| CN114797463B (en) * | 2022-05-30 | 2023-12-26 | 中国科学院过程工程研究所 | Device system and method for sintering flue gas CO catalytic heat exchange series connection medium-low temperature SCR denitration |
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| CN208302512U (en) * | 2018-04-11 | 2019-01-01 | 山东大学 | Cooperate with the flue gas reheat eliminating white smoke system of CO low-temperature denitration |
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| CN103908892A (en) * | 2014-04-17 | 2014-07-09 | 山东大学 | Rotary HC-SCR (Hydrocarbon Selective Catalyst Reduction) denitration reactor |
| CN107008143A (en) * | 2017-05-17 | 2017-08-04 | 中国计量大学 | A kind of Novel SCR denitrating system of anti-gypsum rain |
| CN208302512U (en) * | 2018-04-11 | 2019-01-01 | 山东大学 | Cooperate with the flue gas reheat eliminating white smoke system of CO low-temperature denitration |
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