CN104324611A - Flue gas SCR denitration system of thermal power plant - Google Patents
Flue gas SCR denitration system of thermal power plant Download PDFInfo
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- CN104324611A CN104324611A CN201410588436.7A CN201410588436A CN104324611A CN 104324611 A CN104324611 A CN 104324611A CN 201410588436 A CN201410588436 A CN 201410588436A CN 104324611 A CN104324611 A CN 104324611A
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Abstract
The invention discloses a flue gas SCR denitration system of a thermal power plant, belonging to the technical field of environmental pollution. The flue gas SCR denitration system of the thermal power plant comprises a boiler, a coal economizer and an air preheater, wherein the coal economizer is connected with an outlet of the boiler; the coal economizer is communicated with the air preheater; and a pipeline between the coal economizer and the air preheater is connected with an SCR denitration system. The flue gas SCR denitration system of the thermal power plant is simple in structure, high in denitration efficiency and low in cost, and is suitable for popularization and application; all the systems can be accurately and effectively controlled by a control system so that the flue gas SCR denitration system of the thermal power plant can be operated safely, stably and efficiently; flue gas meets the reaction requirements of common catalysts at the temperature ranging from 320 DEG C to 400 DEG C; and the energy is prevented from being consumed by reheating the flue gas, the needed energy is saved and the production cost is reduced.
Description
Technical field
The present invention relates to environmental technology field, particularly a kind of coal steam-electric plant smoke denitrating system.
Background technology
Nitrogen oxide comprises N
2o, NO, NO
2, N
2o
3, N
2o
4, N
2o
5deng, but to mainly NO, NO that air pollutes
2and N
2o.The nitrogen oxide produced in combustion mainly NO and NO
2---be collectively referred to as NOx, also have a certain amount of N
2o.In most combustion system, the NO of generation accounts for more than 90%.Because NO can be oxidized to NO very soon in atmospheric environment
2, therefore usually use NO
2mass concentration represent NOx concentration.Nitrogen oxide can cause following several harm to environment: cause acid rain or acid deposition; Cause photochemical fog; N
2o is greenhouse gases, greenhouse effects and damaging the ozone layer.
In the large power plant of the fire that China is a large amount of, a large amount of nitrogen oxide is comprised in its flue gas of discharging, serious pollution is caused to environment, the nitrogen oxide how eliminated in coal steam-electric plant smoke just seems particularly important, therefore in the flue gas of thermal power plant, adopt SCR denitration system to carry out denitration, wherein SCR is the abbreviation of Selective Catalytic Reduction, and Chinese is SCR, its principle is under catalyst action, reducing agent NH
3at relatively low temperature by NO and NO
2be reduced into N
2, and there is NH hardly
3oxidation reaction, thus improve N
2selective, decrease NH
3consumption.
Summary of the invention
Goal of the invention of the present invention is: for above-mentioned Problems existing, there is provided a kind of structure simple, denitration efficiency is high, coal steam-electric plant smoke SCR denitration system with low cost, accurately effective control can be carried out to each system by control system, make coal steam-electric plant smoke SCR denitration system safety, stablize, run efficiently, flue-gas temperature exists
320~
400meet the reaction requirement of conventional catalyst between DEG C, avoid flue gas to heat consumed energy again, saved institute's energy requirement, reduced production cost, be applicable to applying.
The technical solution used in the present invention is as follows:.
Coal steam-electric plant smoke SCR denitration system of the present invention, comprise boiler, economizer and air preheater, described economizer is connected with the outlet of boiler, and described economizer is communicated with air preheater, and the pipeline between economizer and air preheater is connected with SCR denitration system.
Owing to have employed said structure, for avoiding flue gas to heat consumed energy again, on the pipeline after SCR denitration system is arranged at economizer, before air preheater.Therefore for newly constructed boiler, owing to having reserved flue-gas denitrification space, SCR reactor can have been placed easily and spray ammonia groove has been set, thus in whole flue gas emission, spraying ammonia, thus be convenient to react nitrogen oxide, realize the object of denitration.Coal steam-electric plant smoke SCR denitration system of the present invention, structure is simple, and denitration efficiency is high, with low cost.
Coal steam-electric plant smoke SCR denitration system of the present invention, described SCR denitration system comprises the control system of SCR reactor, the hybrid system of flue gas/ammonia, the deposit of ammonia and supply system, flue system and SCR, and wherein said SCR reactor to be arranged between economizer and air preheater on pipeline; Horizontal pipe between described economizer and SCR reactor is provided with ammonia entrance, in the deposit that described ammonia porch is connected to ammonia by flue system and supply system, flue system is provided with the hybrid system of flue gas/ammonia and the control system of SCR, and the control system of described SCR is in the hybrid system of flue gas/ammonia, between the deposit of ammonia and supply system.
Owing to have employed said structure, wherein topmost reaction is 4NO+4NH
3+ O
2→ 4N
2+ 6H
2o,
2NO
2+ 4NH
3+ O
2→ 3N
2+ 6H
2o and 6NO
2+ 8NH
3→ 7N
2+ 12H
2o, finally produces nitrogen and water, and its reaction temperature is 230 ~ 450 DEG C, but the temperature of general institute practical application is 320 ~ 400 DEG C, achieves flue-gas temperature and exists
320~
400meet the reaction requirement of conventional catalyst between DEG C, its transformation efficiency reaches between 70 ~ 90% simultaneously, greatly reduces cost.For avoiding flue gas to heat consumed energy again, SCR reactor is arranged at after pipeline being placed between economizer and air preheater economizer, before air preheater; In the deposit that ammonia porch is connected to ammonia by flue system and supply system, make the horizontal pipe of ammonia before adding air preheater adds, and mix with flue gas, for newly constructed boiler, owing to having reserved flue-gas denitrification space, SCR reactor can be placed easily and spray ammonia groove is set, make manufacture very easy; The control system of described SCR is in the hybrid system of flue gas/ammonia, between the deposit of ammonia and supply system, be mainly used in controlling soot blower system, the unloading of ammonia, storage and supply system, gas baffle plate regulating system and denitration main body control system, thus accurately effective control can be carried out by control system to each system, make coal steam-electric plant smoke SCR denitration system safety, stablize, run efficiently.
Coal steam-electric plant smoke SCR denitration system of the present invention, the hybrid system of described flue gas/ammonia comprises dilution air, static mixer, ammonia injection grid and air/ammonia blender, described ammonia sprays the ammonia porch on grid and the horizontal pipe of static mixer between economizer and SCR reactor, and wherein ammonia sprays the top that grid is positioned at static mixer; Described air/ammonia blender is positioned on flue system, by connecting dilution air and air communication on described air/ammonia blender.
Owing to have employed said structure, in air/ammonia blender, sufficient air is provided by dilution air, ammonia is mixed together in air/ammonia blender, and be delivered in ammonia entrance by flue system, and be injected to horizontal pipe from ammonia injection grid, because static mixer is positioned at the below that ammonia sprays grid spray, thus ammonia can be mixed with the nitrogen oxide in horizontal pipe with the mist of air, be convenient to follow-uply under the effect of catalyst, carry out various reaction, guarantee ammonia fully mixes with nitrogen oxide, thus ensure that denitration effect is good.
Coal steam-electric plant smoke SCR denitration system of the present invention, the deposit of described ammonia and supply system comprise discharging compressor, ammonia evaporator, ammonia tank, surge tank and dilution trap, wherein said discharging compressor is connected to ammonia and fills with, described ammonia is filled with and is connected to, described dilution trap is connected on ammonia evaporator, described ammonia evaporator is connected on surge tank, and described surge tank is communicated with flue system.
Owing to have employed said structure, the deposit of ammonia and supply system are respectively ammonia discharge system, ammonia stocking system and ammonia preparation system, thus for providing sufficient pure ammonia, thus can ensure the carrying out of denitration reaction, ensure its quality.
Coal steam-electric plant smoke SCR denitration system of the present invention, the control system of SCR comprises the entrance NO2 detector being arranged at SCR reactor inlet respectively, the outlet NO2 detector being arranged at SCR reactor outlet, boiler load detector, is arranged at control valve on flue system and control processor, wherein entrance NO2 detector, outlet NO2 detector and boiler load detector are connected respectively on control processor, and by signal transmission to control processor, described control processor is connected with control valve, and selects the opening and closing controlling this control valve.
Owing to have employed said structure, the NO2 of porch amount is changed into signal transmission on control processor by entrance NO2 detector, in like manner export NO2 detector and the NO2 in exit amount is changed into signal transmission on control processor, the load shifts of boiler is then that signal transmission is on control processor by boiler load detector, this time control processor is according to setup parameter, carry out calculating and adjusting, thus the control valve opening and closing on control flue system, and the angular dimension of this controller opens, thus control the amount of the ammonia of whole SCR denitration system ejection, control denitration reaction, thus can accurately control to carry out denitration processing procedure to whole flue gas, make coal steam-electric plant smoke SCR denitration system safety, stable, efficient operation.
Coal steam-electric plant smoke SCR denitration system of the present invention, described SCR reactor comprises reactor vessel, catalyst and soot blower, reactor vessel is provided with three layers of catalyst, the inner top of reactor vessel is provided with soot blower, flue gas rectification layer is set in reactor vessel upper end.
For guaranteeing that spray ammonia flue gas carries out catalytic reduction reaction equably in overlying catalyst surface energy, in SCR reactor upper end, flue gas rectification layer is set, and soot blower is installed, make catalyst layer upstream, following velocity of flue gas and Temperature Distribution should be reached: VELOCITY DISTRIBUTION: +/-15 % (80 % are in SCR reactor-cross section) +/-20 % (20 % are in SCR reactor-cross section); Temperature Distribution: +/-10 K (completely on SCR reactor-cross section); Velocity attitude: the maximum deviation having +/-15 ° in the vertical direction; Be loaded with in the SCR reactor of catalyst when flue gas enters along flue, on the surface of catalyst, NH occur
3be catalysed and reduced into Nox, thus achieve the effect of denitration.
Coal steam-electric plant smoke SCR denitration system of the present invention, the bottom of described boiler is connected with combustion air feed pipe, described combustion air feed pipe is connected with air preheater and blower fan, the outlet of described SCR reactor is connected on air preheater, described outlet is connected with deduster after air preheater, and described deduster is connected to air by air-introduced machine.
Owing to have employed said structure, make tail gas through air heat device, preheating is carried out to combustion air, make the temperature that the burning gases entering into boiler reach certain, increase its efficiency of combustion, blower fan provides power for burning gases in addition, ensures the sufficient combustion in boiler; Deduster is set on exhaust pipe simultaneously, by the dust removing in tail gas, ensure that Exhaust Gas is on the impact of environment, tail gas in exhaust pipe mainly drains in air by air-introduced machine as early as possible, thus avoid, to forming blocking in exhaust pipe or blocking up, ensureing can react completely in SCR reactor.Coal steam-electric plant smoke SCR denitration system of the present invention, avoids flue gas to heat consumed energy again, has saved institute's energy requirement, has reduced production cost, be applicable to applying.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows:
1, coal steam-electric plant smoke SCR denitration system of the present invention, structure is simple, and denitration efficiency is high, with low cost, is applicable to applying;
2, coal steam-electric plant smoke SCR denitration system of the present invention, can carry out accurately effective control by control system to each system, make coal steam-electric plant smoke SCR denitration system safety, stablize, run efficiently;
3, coal steam-electric plant smoke SCR denitration system of the present invention, flue-gas temperature exists
320~
400meet the reaction requirement of conventional catalyst between DEG C, avoid flue gas to heat consumed energy again, saved institute's energy requirement, reduced production cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of coal steam-electric plant smoke SCR denitration system of the present invention.
Mark in figure: 1-boiler, 2-economizer, 3-SCR reactor, 4-air preheater, 5-ammonia evaporator, 6-anhydrous ammonia storage tank, 7-deduster, 8-blower fan, 9-air-introduced machine.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in detail.
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
As shown in Figure 1, coal steam-electric plant smoke SCR denitration system of the present invention, comprise boiler 1, economizer 2 and air preheater 4, described economizer 2 is connected with the outlet of boiler 1, described economizer 2 is communicated with air preheater 4, and the pipeline between economizer 2 and air preheater 4 is connected with SCR denitration system.Wherein said SCR denitration system comprises the control system of SCR reactor 3, the hybrid system of flue gas/ammonia, the deposit of ammonia and supply system, flue system and SCR, and wherein said SCR reactor 3 to be arranged between economizer 2 and air preheater 4 on pipeline; Horizontal pipe between described economizer 2 and SCR reactor 3 is provided with ammonia entrance, in the deposit that described ammonia porch is connected to ammonia by flue system and supply system, flue system is provided with the hybrid system of flue gas/ammonia and the control system of SCR, and the control system of described SCR is in the hybrid system of flue gas/ammonia, between the deposit of ammonia and supply system.The hybrid system of described flue gas/ammonia comprises dilution air, static mixer, ammonia injection grid and air/ammonia blender, described ammonia sprays the ammonia porch on grid and the horizontal pipe of static mixer between economizer 2 and SCR reactor 3, and wherein ammonia sprays the top that grid is positioned at static mixer; Described air/ammonia blender is positioned on flue system, by connecting dilution air and air communication on described air/ammonia blender.The deposit of described ammonia and supply system comprise discharging compressor, ammonia evaporator 5, ammonia tank, surge tank and dilution trap, wherein said discharging compressor is connected to ammonia and fills with, described ammonia is filled with and is connected to, described dilution trap is connected on ammonia evaporator 5, described ammonia evaporator 5 is connected on surge tank, and described surge tank is communicated with flue system.The control system of SCR comprise be arranged at SCR reactor 3 entrance respectively entrance NO2 detector, be arranged at outlet NO2 detector, boiler load detector that SCR reactor 3 exports, be arranged at control valve on flue system and control processor, wherein entrance NO2 detector, outlet NO2 detector and boiler load detector are connected respectively on control processor, and by signal transmission to control processor, described control processor is connected with control valve, and selects the opening and closing controlling this control valve.Described SCR reactor 3 comprises reactor vessel, catalyst and soot blower, reactor vessel is provided with three layers of catalyst, the inner top of reactor vessel is provided with soot blower, arranges flue gas rectification layer in reactor vessel upper end.Described flue system comprises flue, expansion joint, deflector and baffle plate.The bottom of described boiler 1 is connected with combustion air feed pipe, described combustion air feed pipe is connected with air preheater 4 and blower fan 8, the outlet of described SCR reactor 3 is connected on air preheater 4, described outlet is connected with deduster 7 after air preheater 4, and described deduster 7 is connected to air by air-introduced machine 9.
Wherein, coal steam-electric plant smoke SCR denitration system of the present invention, key reaction: 4NO+4NH
3+ O
2→ 4N
2+ 6H
2o, 2NO
2+ 4NH
3+ O
2→ 3N
2+ 6H
2o, 6NO
2+ 8NH
3→ 7N
2+ 12H
2o; Reaction temperature 230 ~ 450 DEG C; Application of temperature: 320 ~ 400 DEG C; Transformation efficiency is between 70 ~ 90%.
Coal steam-electric plant smoke SCR denitration system of the present invention, structure is simple, and denitration efficiency is high, with low cost, is applicable to applying; Accurately effective control can be carried out to each system, make coal steam-electric plant smoke SCR denitration system safety, stablize, run efficiently; Flue-gas temperature exists
320~
400meet the reaction requirement of conventional catalyst between DEG C, avoid flue gas to heat consumed energy again, saved energy, reduced cost.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. coal steam-electric plant smoke SCR denitration system, comprise boiler (1), economizer (2) and air preheater (4), described economizer (2) is connected with the outlet of boiler (1), described economizer (2) is communicated with air preheater (4), it is characterized in that: the pipeline between economizer (2) and air preheater (4) is connected with SCR denitration system.
2. coal steam-electric plant smoke SCR denitration system as claimed in claim 1, it is characterized in that: described SCR denitration system comprises the control system of SCR reactor (3), the hybrid system of flue gas/ammonia, the deposit of ammonia and supply system, flue system and SCR, wherein said SCR reactor (3) to be arranged between economizer (2) and air preheater (4) on pipeline; Horizontal pipe between described economizer (2) and SCR reactor (3) is provided with ammonia entrance, in the deposit that described ammonia porch is connected to ammonia by flue system and supply system, flue system is provided with the hybrid system of flue gas/ammonia and the control system of SCR, and the control system of described SCR is in the hybrid system of flue gas/ammonia, between the deposit of ammonia and supply system.
3. coal steam-electric plant smoke SCR denitration system as claimed in claim 2, it is characterized in that: the hybrid system of described flue gas/ammonia comprises dilution air, static mixer, ammonia injection grid and air/ammonia blender, described ammonia injection grid and static mixer are positioned at the ammonia porch on the horizontal pipe between economizer (2) and SCR reactor (3), and wherein ammonia sprays the top that grid is positioned at static mixer; Described air/ammonia blender is positioned on flue system, by connecting dilution air and air communication on described air/ammonia blender.
4. coal steam-electric plant smoke SCR denitration system as claimed in claim 2, it is characterized in that: the deposit of described ammonia and supply system comprise discharging compressor, ammonia evaporator (5), ammonia tank, surge tank and dilution trap, wherein said discharging compressor is connected to ammonia and fills with, described ammonia is filled with and is connected to, described dilution trap is connected on ammonia evaporator (5), described ammonia evaporator (5) is connected on surge tank, and described surge tank is communicated with flue system.
5. coal steam-electric plant smoke SCR denitration system as claimed in claim 2, it is characterized in that: the control system of SCR comprises the entrance NO2 detector being arranged at SCR reactor (3) entrance respectively, be arranged at the outlet NO2 detector that SCR reactor (3) exports, boiler load detector, be arranged at the control valve on flue system, and control processor, wherein entrance NO2 detector, outlet NO2 detector and boiler load detector are connected respectively on control processor, and by signal transmission to control processor, described control processor is connected with control valve, and select the opening and closing controlling this control valve.
6. coal steam-electric plant smoke SCR denitration system as claimed in claim 2, it is characterized in that: described SCR reactor (3) comprises reactor vessel, catalyst and soot blower, reactor vessel is provided with three layers of catalyst, the inner top of reactor vessel is provided with soot blower, flue gas rectification layer is set in reactor vessel upper end.
7. the coal steam-electric plant smoke SCR denitration system as described in one of claim 1 to 6, it is characterized in that: the bottom of described boiler (1) is connected with combustion air feed pipe, described combustion air feed pipe is connected with air preheater (4) and blower fan (8), the outlet of described SCR reactor (3) is connected on air preheater (4), described outlet is connected with deduster (7) after air preheater (4), and described deduster (7) is connected to air by air-introduced machine (9).
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764035A (en) * | 2015-04-07 | 2015-07-08 | 中国华能集团清洁能源技术研究院有限公司 | Liquid ammonia method SNCR (selective non-catalytic reduction) nitrate removal system suitable for circulating fluidized bed boiler |
| CN105597514A (en) * | 2016-02-03 | 2016-05-25 | 广东宝丽华电力有限公司 | Device and method for increasing denitration efficiency of circulating fluidized bed boiler |
| CN105716102A (en) * | 2016-03-24 | 2016-06-29 | 佛山市顺德五沙热电有限公司 | System for optimizing air taking manner of dilution fans of power plant denitration devices |
| CN106838888A (en) * | 2017-01-23 | 2017-06-13 | 北京联力源科技有限公司 | Combustion system and its operation method |
| CN107448962A (en) * | 2017-08-10 | 2017-12-08 | 江苏鲲鹏环保工程技术有限公司 | A kind of outer denitrating technique system of chain furnace high/low temperature flue gas holding furnace |
| CN108452672A (en) * | 2018-03-15 | 2018-08-28 | 苏州奥科德瑞智能科技有限公司 | A kind of smoke eliminator |
| CN108816043A (en) * | 2018-06-07 | 2018-11-16 | 大唐韩城第二发电有限责任公司 | A kind of denitration device and its autocontrol method |
| CN109351181A (en) * | 2018-11-26 | 2019-02-19 | 南京杰科丰环保技术装备研究院有限公司 | A kind of method and system of the wide temperature SCR denitrating flue gas of integrated form |
| CN110208452A (en) * | 2019-05-20 | 2019-09-06 | 浙江浙能技术研究院有限公司 | A kind of denitrating catalyst Performance Test System and method cooperateing with allotment dust content and temperature |
| CN110856800A (en) * | 2018-08-22 | 2020-03-03 | 江苏凯亚环保科技有限公司 | High-temperature denitration system for selective catalytic reduction |
| CN114558448A (en) * | 2022-03-01 | 2022-05-31 | 江苏鲲鹏环保工程技术有限公司 | SCR (Selective catalytic reduction) process-based boiler external flue gas denitration device and process thereof |
| CN114797466A (en) * | 2022-03-25 | 2022-07-29 | 贵州西电电力股份有限公司黔北发电厂 | Thermal power plant flue gas denitration system and method for processing denitration catalyst without shutdown |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764035A (en) * | 2015-04-07 | 2015-07-08 | 中国华能集团清洁能源技术研究院有限公司 | Liquid ammonia method SNCR (selective non-catalytic reduction) nitrate removal system suitable for circulating fluidized bed boiler |
| CN105597514A (en) * | 2016-02-03 | 2016-05-25 | 广东宝丽华电力有限公司 | Device and method for increasing denitration efficiency of circulating fluidized bed boiler |
| CN105716102A (en) * | 2016-03-24 | 2016-06-29 | 佛山市顺德五沙热电有限公司 | System for optimizing air taking manner of dilution fans of power plant denitration devices |
| CN106838888B (en) * | 2017-01-23 | 2023-10-13 | 北京联力源科技有限公司 | Combustion system and method of operating the same |
| CN106838888A (en) * | 2017-01-23 | 2017-06-13 | 北京联力源科技有限公司 | Combustion system and its operation method |
| CN107448962A (en) * | 2017-08-10 | 2017-12-08 | 江苏鲲鹏环保工程技术有限公司 | A kind of outer denitrating technique system of chain furnace high/low temperature flue gas holding furnace |
| CN108452672A (en) * | 2018-03-15 | 2018-08-28 | 苏州奥科德瑞智能科技有限公司 | A kind of smoke eliminator |
| CN108816043A (en) * | 2018-06-07 | 2018-11-16 | 大唐韩城第二发电有限责任公司 | A kind of denitration device and its autocontrol method |
| CN110856800A (en) * | 2018-08-22 | 2020-03-03 | 江苏凯亚环保科技有限公司 | High-temperature denitration system for selective catalytic reduction |
| CN109351181A (en) * | 2018-11-26 | 2019-02-19 | 南京杰科丰环保技术装备研究院有限公司 | A kind of method and system of the wide temperature SCR denitrating flue gas of integrated form |
| CN109351181B (en) * | 2018-11-26 | 2024-01-12 | 南京杰科丰环保技术装备研究院有限公司 | Integrated wide-temperature SCR flue gas denitration method and system |
| CN110208452A (en) * | 2019-05-20 | 2019-09-06 | 浙江浙能技术研究院有限公司 | A kind of denitrating catalyst Performance Test System and method cooperateing with allotment dust content and temperature |
| CN114558448A (en) * | 2022-03-01 | 2022-05-31 | 江苏鲲鹏环保工程技术有限公司 | SCR (Selective catalytic reduction) process-based boiler external flue gas denitration device and process thereof |
| CN114797466A (en) * | 2022-03-25 | 2022-07-29 | 贵州西电电力股份有限公司黔北发电厂 | Thermal power plant flue gas denitration system and method for processing denitration catalyst without shutdown |
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