CN206459177U - Flue gas recirculation chain furnace - Google Patents
Flue gas recirculation chain furnace Download PDFInfo
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- CN206459177U CN206459177U CN201720086982.XU CN201720086982U CN206459177U CN 206459177 U CN206459177 U CN 206459177U CN 201720086982 U CN201720086982 U CN 201720086982U CN 206459177 U CN206459177 U CN 206459177U
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Abstract
Flue gas recirculation chain furnace, solve to reduce the NOx initial ejection concentration technical problems of grate-fired furnace outlet, the low nitrogen drop drainage technique field of category chain-grate boiler.It is characterized in that：The total blast pipe of flue gas recirculation is divided into two-way before entering burner hearth, is connected and communicates with left side wall/right-side wall blast pipe that left side wall/or right-side wall along boiler are symmetrically laid respectively；Left side wall/right-side wall blast pipe branches into upper strata, middle level, lower floor's branch pipe again, and each branch pipe is equipped with multiple reduced air injector heads towards on the tube wall of burner hearth center side, enters burner hearth by furnace wall, and upper strata branch pipe is to burner hearth center air feed above aditus laryngis；Middle level branch pipe is to air feed between traveling-grate stoker and aditus laryngis；Lower floor's branch pipe injector head gos deep into each zoned air room, is blown to zoned air room.By the oxygen content and ignition temperature being layered during the reduction burning of cloth air control system, and strengthen the disturbance of air-flow in chain furnace, realize the discharge for reducing NOx and improve the dual purpose of burning.
Description
Technical field
The utility model is related to a kind of flue gas recirculation chain furnace and its flue gas recirculation laminates air control preparation method, reduces chain
Bar oven furnace outlet NOx initial ejection concentration, the low nitrogen drop drainage technique field of category chain-grate boiler.
Background technology
In face of the immense pressure of environment and the energy, although country is advocating exploitation and is using novel energy, regular period
Interior, the energy resource structure of China is still based on coal, and coal-burning boiler is mainly based on coal-powder boiler and chain furnace.
Coal-powder boiler, is that, by the advance grinds of coal, coal dust and air enter burner hearth, fired in the state of suspension together
Burn, its low-NO_x combustion technology is very ripe.
Coal-burning boiler Industrial Boiler accounts for industrial boilers in China total amount more than 80%, and coal-burned industrial boiler is based on chain furnace.Chain
Bar oven burner hearth mainly uses block coal in vertical, is slowly moved by horizontal fire grate conveying coal, and combustion air is at fire grate bottom
Under up flow, penetrate after fire grate and to be contacted and combustion-supporting with coal.Chain furnace exists excessive empty when the low thermal efficiency, operation when running
Gas coefficient is high, furnace air mixes the shortcomings of uneven, NOx concentration of emission is high.Coal-burning boiler Industrial Boiler has a large capacity and a wide range, dirty
Dye thing is difficult to focus on but directly discharge.The NOx that burning is produced is mainly heating power type and fuel type.Fuel type NOx production
Life is due to the compound containing N in its fuel, and NOx is easily converted into during burning.
Flue gas recirculating technique is to extract a part of low-temperature flue gas from boiler back end ductwork to be fed directly in stove, because that can reduce
Oxygen content and ignition temperature during burning, are effectively reduced thermal NO x concentration of emission, and it extensively should on gas fired-boiler
With the nitric efficiency with 30-60%.But flue gas recirculating technique is applied to chain-grate boiler, for the fuel type of coal
Need further research in the understanding of NOx inhibiting mechanism, and system yet needs to continue perfect.Attempt to that cigarette will be recycled
Gas all leads to inlet air plenum, as a result causes to cause influence with burning completely to the stabilization of coal burning, in the market does not succeed so far
Case.
The content of the invention
The purpose of this utility model is：By flue gas recirculating technique applied to there is provided one kind in the low nitrogen transformation of chain furnace
Flue gas recirculation chain furnace and its flue gas recirculation laminates wind control method, reduction grate-fired furnace outlet NOx initial ejections
Concentration.
The technical solution of the utility model is：A kind of flue gas recirculation chain furnace, including burner hearth, traveling-grate stoker, subregion are sent
Air compartment, aditus laryngis, gas recirculating fan and the total blast pipe of flue gas recirculation, it is characterised in that：The total air intake of flue gas recirculation
Pipe is divided into two-way before entering burner hearth, is connected and communicates with left side wall blast pipe, right-side wall blast pipe pipeline respectively；
The left side wall blast pipe is set along wall paper on the left of boiler, and respectively with left side upper strata branch pipe, middle level branch pipe, lower floor's branch
Pipeline connection is communicated, and each branch pipe is equipped with multiple reduced air injector heads towards on the tube wall of burner hearth center side；The upper strata
The injector head that branch pipe is equipped with enters burner hearth by furnace wall, to aditus laryngis top burner hearth center air feed；The middle level branch pipe
The upper injector head is entered in burner hearth by furnace wall, is supplied to the burner hearth center in region between the traveling-grate stoker and the aditus laryngis
Wind；The injector head being equipped with lower floor's branch pipe gos deep into each zoned air room by furnace wall, is blown to zoned air room；
The right-side wall blast pipe along boiler right-side wall lay, and respectively with right side upper strata branch pipe, middle level branch pipe, lower floor's branch
Pipeline connection is communicated, and each branch pipe is equipped with multiple reduced air injector heads towards on the tube wall of burner hearth center side；The upper strata
The injector head that branch pipe is equipped with enters burner hearth by furnace wall, to aditus laryngis top burner hearth center air feed；The middle level branch pipe
The upper injector head is entered in burner hearth by furnace wall, is supplied to the burner hearth center in region between the traveling-grate stoker and the aditus laryngis
The injector head being equipped with wind, lower floor's branch pipe gos deep into each zoned air room by furnace wall, is blown to zoned air room.
Left side upper strata branch pipe, middle level branch pipe and right side upper strata branch pipe, middle level branch pipe quantity can have multiple, point
Not it is horizontally arranged along side wall.
The reduced air of the gas recirculating fan feeding total blast pipe of flue gas recirculation is sent into using multilayer air blowing control method
In zoned air room below burner hearth, part feeding traveling-grate stoker, flue gas recycled and fresh air is set uniformly to be mixed in air compartment,
Oxygen content and ignition temperature during reduction burning, and then control thermal NO x generation；A part is to above traveling-grate stoker
100mm blows to throat region burner hearth, and relatively hypoxia above fire grate, part is reducing atmosphere, makes part fugitive constituent incomplete
Reproducibility composition in burning, fugitive constituent plays a part of the NOx that reduction has been generated, further reduces NOx's in the middle part of burner hearth
Discharge；A part is injected into the burner hearth central region of more than 100mm above burner hearth aditus laryngis with higher speed.Enhance in burner hearth
The disturbance of portion's air-flow, improves the shortcoming of chain furnace upper air undermixing, enhancing oxygen and fuel mixing and burning, and then
Excess air coefficient during chain furnace operation is reduced, intake during chain furnace operation is reduced, improves boiler thermal output.
Further, the left side/or right side upper strata branch pipe, middle level branch pipe quantity can have multiple, respectively along left side/or
Right side side wall is horizontally arranged, so the recycling above feeding traveling-grate stoker and in the middle part of feeding aditus laryngis top, i.e. burner hearth
Wind, can use laminates wind mode, and flue gas recycled is layered to the diverse location for sending into burner hearth, and hierarchical control reduces NOx's
Initial ejection concentration, and burning of coal situation can be improved, increase the burn-off rate of coal, reduce the big slag phosphorus content of boiler, improve boiler
The thermal efficiency.
Good effect of the present utility model is：The method and system transformed there is provided a kind of chain furnace low nitrogen burning, by cigarette
Gas recirculating technique is introduced into chain furnace.The technology is burnt on the basis of the stable burning of block coal is not influenceed by reducing
When oxygen content and ignition temperature, and strengthen the disturbance of air-flow in chain furnace, realize the discharge for reducing NOx and improve the double of burning
Weight purpose.The nitric efficiency of furnace outlet 15%~40% can be realized using only the technology, while can also improve burning of coal, is reached
Bleeding edge in the market.The technology is due to relatively low up-front investment, stable system operation, good denitrogenation
Efficiency, and then with wide market prospects.
Brief description of the drawings
The utility model is described in further detail with embodiment for explanation below in conjunction with the accompanying drawings.
Fig. 1 is the chamber structure schematic diagram of prior art chain stove（Longitudinal profile）；
Fig. 2 is the chamber structure schematic diagram for introducing flue gas recirculation system rear chain stove；
Fig. 3 is Fig. 2 A-A cross section structure diagrams；
Fig. 4 is Fig. 2 B-B cross section structure diagrams.
In figure：1. traveling-grate stoker；2. coal-in port；3. zoned air room；4. aditus laryngis；5. coal；6. flue gas recirculation is always entered
Phoenix pipe；6.1. wall blast pipe on the left of；6.1.1. left side upper strata branch pipe；6.1.2. middle level branch pipe；6.1.3. lower floor's branch pipe；6.2.
Right-side wall blast pipe；6.2.1. right side upper strata branch pipe；6.2.2. middle level branch pipe；6.2.3. lower floor's branch pipe；7. blower fan；8. front wall；
8.1 left side walls；8.2 right-side wall；9. burner hearth；10. reduced air injector head.
Embodiment
Fig. 1 is the chamber structure schematic diagram of prior art chain stove（Longitudinal profile）, as seen from the figure：Grate-fired furnace 1 is in
Vertical, zoned air room 3 is located at the bottom of burner hearth 9, and the top of zoned air room 3 sets traveling-grate stoker 1, for conveying coal
5.Coal 5 falls on traveling-grate stoker 1 from feeding-coal bucket, with the motion of chain, and traveling-grate stoker 1 enters burner hearth 9, coal at coal-in port 2
Charcoal 5 burns on traveling-grate stoker 1.Combustion air upwardly penetrates through traveling-grate stoker 1 from zoned air room 3 and contacted with coal 9 and combustion-supporting, combustion
Flue gas and coal volatile matter after burning are flowed up by burner hearth aditus laryngis 4.
Fig. 2 is to introduce flue gas recirculating technique after chain furnace, the chamber structure schematic diagram of chain furnace, as seen from the figure：One
Plant flue gas recirculation chain furnace, including burner hearth 9, traveling-grate stoker 1, zoned air room 3, aditus laryngis 4, gas recirculating fan 7 and cigarette
Gas recycles total blast pipe 6, it is characterised in that：The total blast pipe 6 of flue gas recirculation is divided into two-way before entering burner hearth 9, respectively
It is connected and communicates with left side wall blast pipe 6.1, the pipeline of right-side wall blast pipe 6.2；The right-side wall blast pipe 6.2 is along wall on the left of boiler
8.2 lay, and are connected and communicate with right side upper strata branch pipe 6.2.1, middle level branch pipe 6.2.2, lower floor's branch pipe 6.2.3 pipelines respectively, respectively
Branch pipe is equipped with multiple reduced air injector heads 10 towards on the tube wall of the center side of burner hearth 9；The upper strata branch pipe 6.2.1 is equipped with
The injector head 10 by furnace wall enter burner hearth 9, to the center air feed of 4 top burner hearth of aditus laryngis 9；The middle level branch pipe
6.2.2 the upper injector head 10 is entered in burner hearth 9 by furnace wall, to the stove in region between the traveling-grate stoker 1 and the aditus laryngis 4
Thorax center air feed（See Fig. 3 and Fig. 4）；The injector head 10 being equipped with lower floor's branch pipe 6.2.3 is goed deep into each subregion and sent by furnace wall
Air compartment 3, blows to zoned air room 3.
The left side upper strata branch pipe 6.1.1, middle level branch pipe 6.1.2 and the right side upper strata branch pipe 6.2.1, middle level branch pipe
6.2.2 quantity can have multiple, horizontally arranged along side wall respectively.
The chain furnace flue gas recirculation laminates wind control method, it is characterised in that：
First, in the zoned air room 3 under a part of reduced air feeding traveling-grate stoker 1, flue gas recycled is made and new
Wind is uniformly mixed in air compartment, oxygen content and ignition temperature during reduction burning, and then controls thermal NO x generation；
Secondly, the region below of 1 top aditus laryngis of a part of reduced air feeding traveling-grate stoker 4, the top of fire grate 1 lacks relatively
Oxygen, local is reducing atmosphere, makes the reproducibility composition in part fugitive constituent imperfect combustion, fugitive constituent in the middle part of burner hearth, is risen
The discharge of the NOx generated to reduction effect, further reduction NOx；
Then, the middle part of a part of reduced air feeding burner hearth 9, the i.e. top of aditus laryngis 4, the reduced air of this layer is with higher
Speed is injected into burner hearth, enhances the disturbance of the middle part air-flow of burner hearth 9, improves the shortcoming of chain furnace upper air undermixing,
Strengthen oxygen and fuel mixing and burning, and then excess air coefficient during reduction chain furnace operation, when reducing chain furnace operation
Intake, improve boiler thermal output.
Further, because the left side upper strata branch pipe 6.1.1, middle level branch pipe 6.1.2 and right side upper strata branch pipe
6.2.1, middle level branch pipe 6.2.2 quantity can have multiple, be symmetrical arranged respectively along side wall horizontal direction, so feeding chain furnace
Reduced air in the middle part of row top, and feeding aditus laryngis top, i.e. burner hearth, can use laminates wind mode, will recycle cigarette
The diverse location of qi leel layer feeding burner hearth, hierarchical control reduces NOx initial ejection concentration, and can improve burning of coal situation,
Increase the burn-off rate of coal, reduce the big slag phosphorus content of boiler, improve the thermal efficiency of boiler.
A specific embodiment of the present utility model is above are only, but design concept of the present utility model is not limited to
This, all changes for carrying out unsubstantiality to the utility model using this design all should belong to infringement the utility model protection domain
Behavior.
Claims (2)
1. a kind of flue gas recirculation chain furnace, including burner hearth, traveling-grate stoker, zoned air room, aditus laryngis, gas recirculating fan and
The total blast pipe of flue gas recirculation, it is characterised in that：The total blast pipe of flue gas recirculation enter burner hearth before be divided into two-way, respectively with
Left side wall blast pipe, the connection of right-side wall blast pipe pipeline are communicated；
The left side wall blast pipe is set along wall paper on the left of boiler, and respectively with left side upper strata branch pipe, middle level branch pipe, lower floor's branch pipe pipe
Road connection is communicated, and each branch pipe is equipped with multiple reduced air injector heads towards on the tube wall of burner hearth center side；The upper strata branch pipe
The injector head being equipped with enters burner hearth by furnace wall, to aditus laryngis top burner hearth center air feed；Institute on the middle level branch pipe
State injector head by furnace wall to enter in burner hearth, to the burner hearth center air feed in region between the traveling-grate stoker and the aditus laryngis；Institute
The injector head being equipped with lower floor's branch pipe is stated by furnace wall, gos deep into each zoned air room, is blown to zoned air room；
The right-side wall blast pipe along boiler right-side wall lay, and respectively with right side upper strata branch pipe, middle level branch pipe, lower floor's branch pipe pipe
Road connection is communicated, and each branch pipe is equipped with multiple reduced air injector heads towards on the tube wall of burner hearth center side；The upper strata branch pipe
The injector head being equipped with enters burner hearth by furnace wall, to aditus laryngis top burner hearth center air feed；Institute on the middle level branch pipe
State injector head by furnace wall to enter in burner hearth, to the burner hearth center air feed in region between the traveling-grate stoker and the aditus laryngis, institute
The injector head being equipped with lower floor's branch pipe is stated by furnace wall, gos deep into each zoned air room, is blown to zoned air room.
2. a kind of flue gas recirculation chain furnace according to claim 1, it is characterised in that：Left side upper strata branch pipe, middle level
Branch pipe and right side upper strata branch pipe, middle level branch pipe quantity can have multiple, be set respectively along left side/or right-side wall horizontal direction
Put.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720086982.XU CN206459177U (en) | 2017-01-23 | 2017-01-23 | Flue gas recirculation chain furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720086982.XU CN206459177U (en) | 2017-01-23 | 2017-01-23 | Flue gas recirculation chain furnace |
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| CN206459177U true CN206459177U (en) | 2017-09-01 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106678776A (en) * | 2017-01-23 | 2017-05-17 | 上海华之邦科技股份有限公司 | Smoke recycling stokerfeed boiler and smoke recycling multi-layer air distributing control method |
| CN109268814A (en) * | 2018-09-29 | 2019-01-25 | 鞍山美城城市环境服务有限公司 | A kind of coal furnace reduces the combustion method of discharged nitrous oxides |
-
2017
- 2017-01-23 CN CN201720086982.XU patent/CN206459177U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106678776A (en) * | 2017-01-23 | 2017-05-17 | 上海华之邦科技股份有限公司 | Smoke recycling stokerfeed boiler and smoke recycling multi-layer air distributing control method |
| CN109268814A (en) * | 2018-09-29 | 2019-01-25 | 鞍山美城城市环境服务有限公司 | A kind of coal furnace reduces the combustion method of discharged nitrous oxides |
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