CN105841143A - System and method for reducing NOx emissions through smoke recycling - Google Patents
System and method for reducing NOx emissions through smoke recycling Download PDFInfo
- Publication number
- CN105841143A CN105841143A CN201610351104.6A CN201610351104A CN105841143A CN 105841143 A CN105841143 A CN 105841143A CN 201610351104 A CN201610351104 A CN 201610351104A CN 105841143 A CN105841143 A CN 105841143A
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- China
- Prior art keywords
- air
- flue gas
- circulating
- boiler
- blender
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
- F23C9/08—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for reducing temperature in combustion chamber, e.g. for protecting walls of combustion chamber
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2202/00—Fluegas recirculation
- F23C2202/30—Premixing fluegas with combustion air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2202/00—Fluegas recirculation
- F23C2202/50—Control of recirculation rate
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention provides a system and method for reducing NOx emissions through smoke recycling, and belongs to the technical field of emission reduction of a boiler. The technical problem about reduction of NOx emissions through the boiler/heating furnace smoke recycling technology is solved. The system is characterized in that a boiler/heating furnace flue is provided with a bypass circulating smoke pipe; an air inlet of an air blower is provided with an air/smoke mixer, a combustion air inlet and the bypass circulating smoke pipe are connected with and communicate with an inlet pipeline of the mixer through an air/or circulating smoke air door, and the air door and the circulating smoke air door are connected with an electric or pneumatic accommodometer. The opening degree of an air door baffle/circulating smoke air door baffle is adjusted through the electric or pneumatic accommodometer, the ratio of the amount of combustion air entering the mixer to the amount of circulating smoke entering the mixer is controlled, and mixed gas is conveyed by the air blower and enters a boiler/heating furnace to be combusted after passing through a combustor. The system is simple in structure, high in applicability and obvious in NOx reducing effect.
Description
Technical field
The present invention relates to the low NOx technology of boiler, particularly relate to a kind of system and method utilizing flue gas recirculating technique to reduce NOx emission, belong to boiler fall drainage technique field.
Background technology
In fuel oil, combustion gas and process of coal combustion, the generation of NOx is a part for combustion reaction.The nitrogen oxides that burning generates is mainly NO and NO2, it is referred to as NOx.NOx in air is dissolved in water can form nitric acid rain, infringement trees and crops；The NOx also easily hematochrome in human body and animal blood is combined, and causes blood anoxia to cause nervus centralis to benumb, directly damages health；In addition NOx is also easy to cause photochemical fog and haze, has a strong impact on environment and infringement human health.Therefore, environmental law requires to control NOx emission increasingly stringent.Air administering method is broadly divided into two classes at present: a class is low NOx combusting technology, controls NOx generation amount in combustion；Another kind of is fume treatment technology, reduces the NOx generation amount in flue gas.Although latter class method effect is notable but expensive, popularize unrealistic for Industrial Boiler field.
Flue gas recirculating technique is as the one of low NOx combusting technology, in the exhaust pass of boiler or industrial furnace, i.e. extract a certain amount of flue gas mix mutually with combustion air, gaseous mixture is input in burner, reduce ignition temperature and also dilute the oxygen amount in combustion air simultaneously, all can effectively suppress for thermal NO x and fuel type NOx, fall NOx efficiency is up to 30-70%.In the application of present stage flue gas recirculating technique, many draw a circulating flue gas pipe at back-end ductwork and connect air-introduced machine, extract flue gas with this bypass circuit smoke induced draught fan and be transported to boiler/blast of heating furnace entrance, being input in burner after flue gas is mixed with air.In the method, without circulating flue gas air-introduced machine draft, i.e. circulation smoke pipe is directly connected to blower inlet, then rely solely on the suction at blower inlet can not overcome the chimney of the resistance of circulating flue gas pipe and boiler/heating furnace from pull out force, particularly all the more so during Smaller load.Although circulating flue gas air-introduced machine can preferably extract and supplied flue gases, but there are still installation complexity, need to lay the foundations, the problems such as power consumption is big, bring many such as operation problems such as vibrations.
Summary of the invention
It is an object of the invention to: providing a kind of boiler/flue gas of heating furnace recirculation to reduce the system of NOx emission, this system structure is simple, the suitability strong, and general boiler/reheat furnace system only needs to improve a little can be applied.
For reaching above-mentioned purpose, technical scheme be:
A kind of flue gas recirculation reduces the system of NOx emission, including the aerator, burner, boiler/heating furnace, flue and the chimney that are successively connected in series successively, it is characterised in that: described flue is equipped with bypass circuit fume pipe；The air inlet of described aerator is equipped with air-flue gas blender, combustion air inlet is connected with described blender inlet pipeline is communicated by air dampers, described bypass circuit fume pipe is connected with electric or pneumatic adjusting apparatus by connect with described blender inlet pipeline connection, described air dampers and circulating flue gas air door of circulating flue gas air door.
Described electric or pneumatic adjusting apparatus is by regulating aperture and the aperture of regulation circulating flue gas damper of air dampers baffle plate, control the proportioning between combustion air and amount of circulating gas in entrance blender, then after burner, entered boiler/heating furnace burning by aerator conveying gaseous mixture.
When boiler/heating furnace runs, particularly during Smaller load, air dampers baffle plate need to turn down, and the when that aperture being sufficiently small, a small amount of combustion air enters the air-flue gas blender being placed in blower inlet；In bypass circuit fume pipe, partial fume can overcome the air also flowing to blower inlet from the pull out force-flue gas blender of flue stack under the detaching of aerator；When needing to increase load, opening big air dampers baffle plate, also open systemic circulation flue gas damper simultaneously, air and circulating flue gas just can enter in air-flue gas blender by a certain percentage；Owing to flue gas is mixed in combustion air, and it is transported to combustor by aerator, reduces concentration and the ignition temperature of the oxygen of combustion process.
The positive effect of the present invention is: the air dampers baffle opening arranged by blower inlet is regulated, automatically in extraction partial hearth, flue gas combines with combustion air, control the proportioning between air capacity and amount of circulating gas, after burner, combustor and fuel mixed combustion is arrived again by aerator conveying gaseous mixture, prevent localized hyperthermia from producing and shorten the flue gas time of staying in high-temperature region, thus produce and stablize flame suitably, uniformly, inhibit the generation of NOx simultaneously, produce minimal amount of NOx.Present configuration is simple, method is easy, have only on the basis of original boiler/reheat furnace system carry out simple modifications, during aerator many employings variable frequency adjustment, under the middle Smaller load of boiler/reheat furnace system, during the aerator slow-speed of revolution, coordinate air dampers also can produce enough suction.Circulating flue gas can effectively reduce in-furnace temperature, the oxygen concentration in flue gas and air mixture can be reduced simultaneously, advantageously reduce the generation of heating power high temperature modification NOx, additionally decrease the reaction of intermediate product nitrogen-containing group and oxygen, be therefore also beneficial to reduce the generation of fuel type NOx.Reduce NOXEffect obvious.When burning natural gas, NOx concentration can reduce 30-70%, reduces by 10%～35% during oil firing.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 1 is present configuration schematic diagram.
In figure, 1 aerator；2. air dampers；3 circulating flue gas air doors；4 chimneys；5 boilers/heating furnace；6 burners；7 blenders
；8 circulating flue gas pipes；9 boilers/furnace flue.
Detailed description of the invention
Fig. 1 is present configuration schematic diagram, as shown in Figure 1, a kind of flue gas recirculation reduces the system of NOx emission, including the aerator 1, burner 6, boiler/heating furnace 5, flue 9 and the chimney 4 that are successively connected in series successively, it is characterised in that: described flue 9 is equipped with bypass circuit fume pipe 8；The air inlet of described aerator 1 is equipped with air-flue gas blender 7, combustion air inlet is connected with described blender 7 inlet pipeline is communicated by air dampers 2, and described bypass circuit fume pipe 8 is connected with described blender 7 inlet pipeline connection by circulating flue gas air door 3；Described air dampers and circulating flue gas air door are connected with electric or pneumatic adjusting apparatus.
Described air dampers 2 and circulating flue gas air door 3 are regulated by electric or pneumatic adjusting apparatus, by aperture and the aperture (being used for assisting the size of fine setting amount of circulating gas) of regulation circulating flue gas air door 3 baffle plate of regulation air dampers 2 baffle plate, control the proportioning between combustion air and amount of circulating gas in entrance blender 7, carried gaseous mixture by aerator 1 again after burner 6, to enter boiler/heating furnace 5 burn, thus produce and stablize flame suitably, uniformly, produce minimal amount of NOx simultaneously.
During actual motion, aerator 1 operates and produces suction in the inside of its entrance or even blender 7, owing to the entrance of blender 7 is typically directly connected in air, therefore can be drawn in blender by combustion air easily；But owing to the chimney 4 of boiler/reheat furnace system 5 has certain altitude, and can produce certain from pull out force, add circulating flue gas pipe 8 and self have on-way resistance, even if therefore circulating flue gas air door 3 standard-sized sheet on circulating flue gas pipe 8, flue gas can not be promoted to flow to blender 7 through circulating flue gas air door 3；So needing the air dampers 2 by blender 7 entrance to turn down to a certain extent, the sufficiently large resistance overcoming circulating flue gas to flow through of suction produced in blender 7, a small amount of circulating flue gas just can be made to flow to blender 7；I.e. boiler/heating furnace 5 flue gas major part out flows to chimney through boiler/furnace flue 9, and fraction then flows through circulating flue gas pipe 8 and enters blender 7.
Along with boiler/heating furnace 5 system loading rises big, air dampers 2 is opened greatly therewith, circulating flue gas air door 3 regulates aperture the most therewith, air and circulating flue gas just can be transported to burner 6 through aerator 1 after mixing in blender 7 with certain proportion, finally burn with fuel in the combustor of boiler/heating furnace 5.
Claims (2)
1. flue gas recirculation reduces a system for NOx emission, including the aerator, burner, boiler/heating furnace, flue and the chimney that are successively connected in series successively, it is characterised in that: described flue is equipped with bypass circuit fume pipe；The air inlet of described aerator is equipped with air-flue gas blender, and combustion air inlet is connected with described blender inlet pipeline is communicated by air dampers, and described bypass circuit fume pipe is connected with described blender inlet pipeline connection by circulating flue gas air door；Described air dampers and circulating flue gas air door are connected with electric or pneumatic adjusting apparatus.
The fall discharge method of the system of flue gas recirculation reduction NOx emission the most according to claim 1, it is characterized in that: described electric or pneumatic adjusting apparatus is by regulating aperture and the aperture of regulation circulating flue gas damper of air dampers baffle plate, control the proportioning between combustion air and amount of circulating gas in entrance blender, then after burner, entered boiler/heating furnace burning by aerator conveying gaseous mixture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610351104.6A CN105841143A (en) | 2016-05-25 | 2016-05-25 | System and method for reducing NOx emissions through smoke recycling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610351104.6A CN105841143A (en) | 2016-05-25 | 2016-05-25 | System and method for reducing NOx emissions through smoke recycling |
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| CN105841143A true CN105841143A (en) | 2016-08-10 |
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| CN201610351104.6A Pending CN105841143A (en) | 2016-05-25 | 2016-05-25 | System and method for reducing NOx emissions through smoke recycling |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107062918A (en) * | 2016-12-09 | 2017-08-18 | 重庆沃克斯博能科技有限公司 | Tobacco blending device for heat storage type combustion industrial furnace and the tobacco blending component and industrial furnace with tobacco blending device |
| CN107461736A (en) * | 2017-09-18 | 2017-12-12 | 北京富士特锅炉有限公司 | A kind of gas industry boiler smoke recycling denitration and air preheating system |
| CN108662585A (en) * | 2018-07-06 | 2018-10-16 | 西安交通大学 | A kind of ultralow NO of low-load combustion-stabilizingXCombustion system and its burner |
| CN109099417A (en) * | 2018-09-18 | 2018-12-28 | 浙江三杰能源科技有限公司 | A kind of flue gas forces the low NOx combustion method and device of interior circulation |
| CN109489058A (en) * | 2018-11-29 | 2019-03-19 | 北京富士特锅炉有限公司 | A kind of boiler smoke reflux air blast cooling heat recycling device and its control method |
| CN111380049A (en) * | 2019-11-27 | 2020-07-07 | 湖北中烟工业有限责任公司 | Boiler low-nitrogen discharge system |
| CN111397403A (en) * | 2020-03-23 | 2020-07-10 | 华南理工大学 | Boiler flue gas waste heat recovery system and method based on heat exchange absorption tower |
| CN113531519A (en) * | 2021-07-01 | 2021-10-22 | 中国轻工业武汉设计工程有限责任公司 | Smoke recirculation nozzle device for preventing slagging and abrasion of boiler water-cooled wall |
| CN113803739A (en) * | 2020-06-15 | 2021-12-17 | 中国石油化工股份有限公司 | Fuel low-nitrogen combustion system for steam injection boiler |
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| TW505763B (en) * | 2000-06-20 | 2002-10-11 | John Zink Co Llc | Fuel dilution methods and apparatus for NOx reduction |
| US20100252776A1 (en) * | 2008-04-25 | 2010-10-07 | Walter Farman Farmayan | Methods, compositions, and burner systems for reducing emissions of carbon dioxide gas into the atmosphere |
| CN103398397A (en) * | 2013-07-24 | 2013-11-20 | 张蕊 | Combustion system of boiler and combustion method implemented by aid of system |
| CN104501203A (en) * | 2014-12-19 | 2015-04-08 | 深圳市山水乐环保科技有限公司 | Gas mixture ratio control apparatus and method implementing low-nitrogen combustion by oxygen-deficient CO2-rich gas |
| CN105588135A (en) * | 2016-02-22 | 2016-05-18 | 大震锅炉工业（昆山）有限公司 | Smoke recirculator for boiler |
| CN205640882U (en) * | 2016-05-25 | 2016-10-12 | 上海华之邦科技股份有限公司 | System for gas recirculation reduces NOx and discharges |
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Patent Citations (6)
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| TW505763B (en) * | 2000-06-20 | 2002-10-11 | John Zink Co Llc | Fuel dilution methods and apparatus for NOx reduction |
| US20100252776A1 (en) * | 2008-04-25 | 2010-10-07 | Walter Farman Farmayan | Methods, compositions, and burner systems for reducing emissions of carbon dioxide gas into the atmosphere |
| CN103398397A (en) * | 2013-07-24 | 2013-11-20 | 张蕊 | Combustion system of boiler and combustion method implemented by aid of system |
| CN104501203A (en) * | 2014-12-19 | 2015-04-08 | 深圳市山水乐环保科技有限公司 | Gas mixture ratio control apparatus and method implementing low-nitrogen combustion by oxygen-deficient CO2-rich gas |
| CN105588135A (en) * | 2016-02-22 | 2016-05-18 | 大震锅炉工业（昆山）有限公司 | Smoke recirculator for boiler |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107062918A (en) * | 2016-12-09 | 2017-08-18 | 重庆沃克斯博能科技有限公司 | Tobacco blending device for heat storage type combustion industrial furnace and the tobacco blending component and industrial furnace with tobacco blending device |
| CN107062918B (en) * | 2016-12-09 | 2023-04-07 | 重庆沃克斯博能科技有限公司 | Smoke distribution device for heat accumulating type combustion industrial furnace, smoke distribution assembly with smoke distribution device and industrial furnace |
| CN107461736A (en) * | 2017-09-18 | 2017-12-12 | 北京富士特锅炉有限公司 | A kind of gas industry boiler smoke recycling denitration and air preheating system |
| CN108662585A (en) * | 2018-07-06 | 2018-10-16 | 西安交通大学 | A kind of ultralow NO of low-load combustion-stabilizingXCombustion system and its burner |
| CN108662585B (en) * | 2018-07-06 | 2024-05-28 | 西安交通大学 | Low-load stable-combustion ultralow NOXCombustion system and combustor thereof |
| CN109099417A (en) * | 2018-09-18 | 2018-12-28 | 浙江三杰能源科技有限公司 | A kind of flue gas forces the low NOx combustion method and device of interior circulation |
| CN109099417B (en) * | 2018-09-18 | 2024-03-12 | 宁波远康动力设备有限公司 | Low NOx combustion method and device for forced internal circulation of flue gas |
| CN109489058A (en) * | 2018-11-29 | 2019-03-19 | 北京富士特锅炉有限公司 | A kind of boiler smoke reflux air blast cooling heat recycling device and its control method |
| CN111380049B (en) * | 2019-11-27 | 2022-05-27 | 湖北中烟工业有限责任公司 | Boiler low-nitrogen discharge system |
| CN111380049A (en) * | 2019-11-27 | 2020-07-07 | 湖北中烟工业有限责任公司 | Boiler low-nitrogen discharge system |
| CN111397403A (en) * | 2020-03-23 | 2020-07-10 | 华南理工大学 | Boiler flue gas waste heat recovery system and method based on heat exchange absorption tower |
| CN113803739A (en) * | 2020-06-15 | 2021-12-17 | 中国石油化工股份有限公司 | Fuel low-nitrogen combustion system for steam injection boiler |
| CN113531519A (en) * | 2021-07-01 | 2021-10-22 | 中国轻工业武汉设计工程有限责任公司 | Smoke recirculation nozzle device for preventing slagging and abrasion of boiler water-cooled wall |
| CN113531519B (en) * | 2021-07-01 | 2023-06-30 | 中国轻工业武汉设计工程有限责任公司 | Flue gas recirculation nozzle device for preventing boiler water-cooled wall from slagging and wearing |
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Application publication date: 20160810 |
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