CN205640882U - System for gas recirculation reduces NOx and discharges - Google Patents
System for gas recirculation reduces NOx and discharges Download PDFInfo
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- CN205640882U CN205640882U CN201620482512.0U CN201620482512U CN205640882U CN 205640882 U CN205640882 U CN 205640882U CN 201620482512 U CN201620482512 U CN 201620482512U CN 205640882 U CN205640882 U CN 205640882U
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Abstract
The utility model provides a system for gas recirculation reduces NOx and discharges, will solve with the technical problem that the boiler / heating furnace gas recirculation technique reduction NOx discharged, belongs to the boiler and falls row technical field. Its characterized in that: bypass recirculated flue gas pipe has been put to boiler / heating furnace flue, has the air put to the air intake of air -blower flue gas blender, combustion air import and bypass recirculated flue gas pipe respectively through air or recirculated flue gas air door and the connection of blender inlet piping communicates with each other, and air air door and recirculated flue gas air door are connected with electronic or pneumatic adjustment appearance. By aperture electronic or pneumatic adjustment appearance conditioning air damper recirculated flue gas damper, control access to in the blender ratio between combustion air and the recirculated flue gas volume, carry the gas mixture to get into boiler / heating furnace burning behind the combustor by the air -blower again. The utility model discloses simple structure, suitability are strong, and it is obvious to reduce the NOx effect.
Description
Technical field
This utility model relates to the low NOx technology of boiler, particularly relates to a kind of system and method utilizing flue gas recirculating technique to reduce NOx emission, belongs 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
The purpose of this utility model is: 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.
Good effect of the present utility model 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.This utility model simple in construction, method are 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 utility model is described in further detail.
Fig. 1 is this utility model structural representation.
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 this utility model structural representation, 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 (1)
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620482512.0U CN205640882U (en) | 2016-05-25 | 2016-05-25 | System for gas recirculation reduces NOx and discharges |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620482512.0U CN205640882U (en) | 2016-05-25 | 2016-05-25 | System for gas recirculation reduces NOx and discharges |
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| CN205640882U true CN205640882U (en) | 2016-10-12 |
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| CN201620482512.0U Active CN205640882U (en) | 2016-05-25 | 2016-05-25 | System for gas recirculation reduces NOx and discharges |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105841143A (en) * | 2016-05-25 | 2016-08-10 | 上海华之邦科技股份有限公司 | System and method for reducing NOx emissions through smoke recycling |
| CN108443868A (en) * | 2018-05-22 | 2018-08-24 | 西安交通大学 | A kind of air/low NO of lean gas replaceable typexTurbulent burner |
| CN108613173A (en) * | 2018-06-05 | 2018-10-02 | 郑州大学 | Gas fired-boiler flue gas recirculation humidifies low nitrogen system |
-
2016
- 2016-05-25 CN CN201620482512.0U patent/CN205640882U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105841143A (en) * | 2016-05-25 | 2016-08-10 | 上海华之邦科技股份有限公司 | System and method for reducing NOx emissions through smoke recycling |
| CN108443868A (en) * | 2018-05-22 | 2018-08-24 | 西安交通大学 | A kind of air/low NO of lean gas replaceable typexTurbulent burner |
| CN108443868B (en) * | 2018-05-22 | 2024-04-16 | 西安交通大学 | Air/lean gas replaceable low NO x Swirl burner |
| CN108613173A (en) * | 2018-06-05 | 2018-10-02 | 郑州大学 | Gas fired-boiler flue gas recirculation humidifies low nitrogen system |
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