CN202021013U - Dedusting and denitration system of coal-fired flue gas of thermal power plant - Google Patents

Dedusting and denitration system of coal-fired flue gas of thermal power plant Download PDF

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Publication number
CN202021013U
CN202021013U CN2011200655541U CN201120065554U CN202021013U CN 202021013 U CN202021013 U CN 202021013U CN 2011200655541 U CN2011200655541 U CN 2011200655541U CN 201120065554 U CN201120065554 U CN 201120065554U CN 202021013 U CN202021013 U CN 202021013U
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CN
China
Prior art keywords
heat exchanger
outlet
flue gas
import
gas
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CN2011200655541U
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Chinese (zh)
Inventor
谢玉荣
赵兵
沈解忠
毛军华
李俊
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无锡华光锅炉股份有限公司
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Priority to CN2011200655541U priority Critical patent/CN202021013U/en
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Abstract

The utility model provides a dedusting and denitration system of coal-fired flue gas of a thermal power plant. The dedusting and denitration system reduces denitration cost while high-efficient denitration of the system is ensured, and is characterized in that heat exchangers comprise a heat exchanger I and a heat exchanger II, and a coal economizer is provided with two flue gas outlets. One flue gas outlet leads to a high temperature inlet of the heat exchanger I, and the other flue gas outlet leads to a high temperature inlet of the heat exchanger II. A high temperature outlet of the heat exchanger I is connected with an inlet of a flue gas flow regulating valve, an outlet of the flue gas flow regulating valve is connected with one inlet of a flue gas mixer, and a high temperature outlet of the heat exchanger II is connected with another inlet of the flue gas mixer. An outlet of the flue gas mixer is connected with an inlet of a high-efficiency dust cleaner, and an outlet of the high-efficiency dust cleaner is connected with a low temperature inlet of the heat exchanger II. The low temperature inlet of the heat exchanger II is connected with an inlet of a selective catalytic reduction (SCR) reactor, an outlet of the SCR reactor is connected with an air preheater, and low temperature liquid is located in a section from a low temperature inlet of the heat exchanger I to a low temperature outlet of the heat exchanger I.

Description

A kind of thermal power plant coal-fired flue-gas dust-removing denitrating system
Technical field
The utility model relates to flue gas ash removal denitrating system technical field, is specially a kind of thermal power plant coal-fired flue-gas dust-removing denitrating system.
Background technology
NOx is one of primary pollution source that causes atmosphere pollution, and usually said NOx has multiple multi-form: N 2O, NO, NO 2, N 2O 3, N 2O 4And N 2O 5, wherein NO and NO 2It is important atmosphere pollution.They are discharged in the atmosphere and easily form acid rain and photochemical fog, damage the ozone layer and cause greenhouse effects, have brought serious harm for natural environment and human health.The 70% direct burning that comes from coal in the discharge capacity of China NOx, power industry is again the coal-fired rich and influential family of China, therefore must be controlled the NOx discharging as the key industry thermal power plant.
At present, the technology of control NOx discharging has: 1, fuel denitride technology; 2, low NOx combusting technology; 3, gas denitrifying technology.Advantages such as in above-mentioned three class denitration technologies, the SCR(selective reduction in the gas denitrifying technology) method has the denitration efficiency height, selectivity is good and stable, so thermal power plant extensively adopts SCR method control NOx discharging.
In order to satisfy the temperature that SCR method catalyst has better catalytic denitration efficient: 300 ℃-400 ℃, the SCR reactor need be arranged between economizer and the air preheater.But because the coal-fired flue gas that produces, ash content is higher, cause in the economizer exit flue gas flying dust concentration higher, the wearing and tearing, the hole that directly cause the SCR catalyst reactor stop up and poisoning, reduced system's denitration efficiency and catalyst service life, therefore, in order to keep the system high efficiency denitration, need the expensive catalyst of frequent replacing, thereby significantly increased the denitration cost.
Summary of the invention
At the problems referred to above, the utility model provides a kind of thermal power plant coal-fired flue-gas dust-removing denitrating system, its when guaranteeing the system high efficiency denitration, reduced the denitration cost.
A kind of thermal power plant coal-fired flue-gas dust-removing denitrating system, its technical scheme is such: it comprises coal-burning boiler, economizer, heat exchanger, the SCR reactor, air preheater, the flue gas of described coal-burning boiler leads to the import of described economizer, it is characterized in that: described heat exchanger comprises the heat exchanger I, the heat exchanger II, described economizer has two exhanst gas outlets, one of them exhanst gas outlet leads to the high temperature import of described heat exchanger I, another exhanst gas outlet leads to the high temperature import of described heat exchanger II, the high temperature outlet of described heat exchanger I connects the import of flue gas flow control valve, the outlet of described flue gas flow control valve connects an import of flue gas blender, the high temperature outlet of described heat exchanger II connects another import of described flue gas blender, the outlet of described flue gas blender connects the import of high-efficiency dust remover, the outlet of described high-efficiency dust remover connects the low temperature import of described heat exchanger II, the low temperature outlet of described heat exchanger II connects the import of described SCR reactor, the outlet of described SCR reactor connects described air preheater, and the low temperature import of described heat exchanger I to low temperature outlet is cryogenic liquid.
It is further characterized in that: described cryogenic liquid is specially water;
The heat exchanger I adopts liquid-gas heat exchanger;
The heat exchanger II adopts gas-gas heat exchanger;
Described high-efficiency dust remover is specially electrostatic precipitator/or sack cleaner;
The outlet of described air preheater is connected with air-introduced machine, described air-introduced machine connects the one-level import of flue gas heat exchange device, the one-level outlet of described flue gas heat exchange device connects the desulfurizing tower import, described desulfurizing tower outlet connects the secondary import of described flue gas heat exchange device, and chimney is led in the secondary outlet of described flue gas heat exchange device.
After adopting structure of the present utility model, the total flue gas of high temperature is divided into two strands of high-temperature flue gas in the economizer porch, these two strands of flue gases become low-temperature flue gas after by heat exchanger I and the heat exchange of heat exchanger II, two strands of low-temperature flue gas mix the back at the flue gas blender and form the total flue gas of low temperature, after the total flue gas of low temperature heats by deduster dedusting and heat exchanger II, enter the SCR reactor and finish denitrification process, it has realized the purpose of denitration after the first dedusting, eliminated in the flue gas flying dust to the influence of SCR denitrating technique catalyst, the catalytic performance of rugged catalyst effectively, prolong catalyst life, it is when guaranteeing the system high efficiency denitration, reduced the denitration cost.
Description of drawings
Fig. 1 is a structural representation block diagram of the present utility model.
The specific embodiment
See Fig. 1, it comprises coal-burning boiler 1, economizer 2, heat exchanger, SCR reactor 8, air preheater 9, the flue gas of coal-burning boiler 1 leads to the import of economizer 2, heat exchanger comprises heat exchanger I 3, heat exchanger II 7, heat exchanger I 3 adopts liquid-gas heat exchanger, heat exchanger II 7 adopts gas-gas heat exchanger, the low temperature import of heat exchanger I to low temperature outlet is water, the current direction economizer 2 of low temperature outlet, economizer 2 has two exhanst gas outlets, one of them exhanst gas outlet leads to the high temperature import of heat exchanger I 3, another exhanst gas outlet leads to the high temperature import of heat exchanger II 7, the high temperature outlet of heat exchanger I 3 connects the import of flue gas flow control valve 4, the outlet of flue gas flow control valve 4 connects an import of flue gas blender 5, the high temperature outlet of heat exchanger II 7 connects another import of flue gas blender 5, the outlet of flue gas blender 5 connects the import of high-efficiency dust remover 6, the outlet of high-efficiency dust remover 6 connects the low temperature import of heat exchanger II 7, the low temperature outlet of heat exchanger II 7 connects the import of SCR reactor 8, the outlet of SCR reactor 8 connects air preheater 9, the outlet of air preheater 9 is connected with air-introduced machine 10, air-introduced machine 10 connects the one-level import of flue gas heat exchange device 11, the one-level outlet of flue gas heat exchange device 11 connects desulfurizing tower 12 imports, desulfurizing tower 12 outlets connect the secondary import of flue gas heat exchange device 11, and chimney 13 is led in the secondary outlet of flue gas heat exchange device 11.Wherein high-efficiency dust remover 6 is specially electrostatic precipitator/or sack cleaner.
Its operation principle is as follows:
In economizer 2 exits, the total flue gas shunting of high temperature is flue gas I and flue gas II, and wherein the flue gas I through after economizer 2, the heat exchanger I 3, enters flue gas blender 5 earlier at last; The flue gas II enters heat exchanger II 7 by the flue bypass earlier and carries out heat exchange, enter flue collector by flue gas blender 5 at last, mix with the flue gas I, in a whole set of denitrating system device, the effect of heat exchanger I 3 is further to reduce flue gas I temperature, guarantee high-efficiency dust remover 6 entrance flue gas temperatures between 120-150 ℃, satisfy the temperature conditions of high-efficiency dust remover 6 normal operations; The effect of flue gas flow control valve 4 is the flows by adjusting high-temperature flue gas I and high-temperature flue gas II, distributes the heat of taking of two strands of high-temperature flue gas indirectly, and two strands of flue gases satisfy each part temperatures requirement by relevant heat transfer process again; 5 effects of flue gas blender are that the flue gas I of low temperature and the flue gas II after the heat exchange are mixed, and enter flue collector then; The effect of high-efficiency dust remover 6 is the flying dusts that remove in the flue gas, thereby eliminates the influence of flying dust to the SCR catalyst reactor; 7 effects of heat exchanger II are by the total flue gas of low temperature in the flue collector of high-temperature flue gas II heating high-efficiency dust remover 6 outlets, for the reaction of the NOx in the SCR reactor 8 and reducing agent provides indispensable temperature conditions, make SCR reactor 8 entrance flue gas temperatures maintain 300-400 ℃.

Claims (6)

1. thermal power plant's coal-fired flue-gas dust-removing denitrating system, it comprises coal-burning boiler, economizer, heat exchanger, the SCR reactor, air preheater, the flue gas of described coal-burning boiler leads to the import of described economizer, it is characterized in that: described heat exchanger comprises the heat exchanger I, the heat exchanger II, described economizer has two exhanst gas outlets, one of them exhanst gas outlet leads to the high temperature import of described heat exchanger I, another exhanst gas outlet leads to the high temperature import of described heat exchanger II, the high temperature outlet of described heat exchanger I connects the import of flue gas flow control valve, the outlet of described flue gas flow control valve connects an import of flue gas blender, the high temperature outlet of described heat exchanger II connects another import of described flue gas blender, the outlet of described flue gas blender connects the import of high-efficiency dust remover, the outlet of described high-efficiency dust remover connects the low temperature import of described heat exchanger II, the low temperature outlet of described heat exchanger II connects the import of described SCR reactor, the outlet of described SCR reactor connects described air preheater, and the low temperature import of described heat exchanger I to low temperature outlet is cryogenic liquid.
2. a kind of thermal power plant according to claim 1 coal-fired flue-gas dust-removing denitrating system, it is characterized in that: described cryogenic liquid is specially water.
3. a kind of thermal power plant according to claim 1 coal-fired flue-gas dust-removing denitrating system is characterized in that: the heat exchanger I adopts liquid-gas heat exchanger.
4. a kind of thermal power plant according to claim 1 coal-fired flue-gas dust-removing denitrating system is characterized in that: the heat exchanger II adopts gas-gas heat exchanger.
5. a kind of thermal power plant according to claim 1 coal-fired flue-gas dust-removing denitrating system is characterized in that: described high-efficiency dust remover is specially electrostatic precipitator/or sack cleaner.
6. a kind of thermal power plant according to claim 1 coal-fired flue-gas dust-removing denitrating system, it is characterized in that: the outlet of described air preheater is connected with air-introduced machine, described air-introduced machine connects the one-level import of flue gas heat exchange device, the one-level outlet of described flue gas heat exchange device connects the desulfurizing tower import, described desulfurizing tower outlet connects the secondary import of described flue gas heat exchange device, and chimney is led in the secondary outlet of described flue gas heat exchange device.
CN2011200655541U 2011-03-14 2011-03-14 Dedusting and denitration system of coal-fired flue gas of thermal power plant CN202021013U (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102309918A (en) * 2011-03-14 2012-01-11 无锡华光锅炉股份有限公司 Dedusting and denitration system for thermal power plant fire coal smoke
CN102921297A (en) * 2012-11-21 2013-02-13 江苏中建材环保研究院有限公司 SCR denitrification device for dedusting smoke of cement kiln at high temperature
CN103406006A (en) * 2013-08-30 2013-11-27 安徽省元琛环保科技有限公司 SCR (Selective Catalytic Reduction) denitration device for NOx control of rotary cement kiln
CN103480272A (en) * 2013-10-01 2014-01-01 王脯胜 Dust-removing, denitration and desulfurization process and device for flue gas of glass kiln
CN103953921A (en) * 2014-04-22 2014-07-30 东方电气集团东方锅炉股份有限公司 Oxygen-enriched combustion boiler system and operation method thereof
CN105498974A (en) * 2015-12-01 2016-04-20 中国能源建设集团广东省电力设计研究院有限公司 Auxiliary device for electric dust remover and flue gas dust removal system
CN106669345A (en) * 2017-01-20 2017-05-17 东南大学 Method for synergistically realizing efficient removal of PM2.5/SO3 in high-moisture flue gas and zero water consumption in wet desulphurization
CN108744968A (en) * 2018-06-12 2018-11-06 朋仁锋 A kind of coal steam-electric plant smoke treatment process

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102309918A (en) * 2011-03-14 2012-01-11 无锡华光锅炉股份有限公司 Dedusting and denitration system for thermal power plant fire coal smoke
CN102309918B (en) * 2011-03-14 2013-07-17 无锡华光锅炉股份有限公司 Dedusting and denitration system for thermal power plant fire coal smoke
CN102921297A (en) * 2012-11-21 2013-02-13 江苏中建材环保研究院有限公司 SCR denitrification device for dedusting smoke of cement kiln at high temperature
CN103406006A (en) * 2013-08-30 2013-11-27 安徽省元琛环保科技有限公司 SCR (Selective Catalytic Reduction) denitration device for NOx control of rotary cement kiln
CN103480272A (en) * 2013-10-01 2014-01-01 王脯胜 Dust-removing, denitration and desulfurization process and device for flue gas of glass kiln
CN103953921A (en) * 2014-04-22 2014-07-30 东方电气集团东方锅炉股份有限公司 Oxygen-enriched combustion boiler system and operation method thereof
CN105498974A (en) * 2015-12-01 2016-04-20 中国能源建设集团广东省电力设计研究院有限公司 Auxiliary device for electric dust remover and flue gas dust removal system
CN106669345A (en) * 2017-01-20 2017-05-17 东南大学 Method for synergistically realizing efficient removal of PM2.5/SO3 in high-moisture flue gas and zero water consumption in wet desulphurization
CN108744968A (en) * 2018-06-12 2018-11-06 朋仁锋 A kind of coal steam-electric plant smoke treatment process
CN108744968B (en) * 2018-06-12 2020-06-23 衢州东港环保热电有限公司 Thermal power plant flue gas treatment process

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Granted publication date: 20111102

Effective date of abandoning: 20130717