CN205227293U - Adjustable gas recirculation's of many coals adaptability low NOx discharges chain furnace - Google Patents
Adjustable gas recirculation's of many coals adaptability low NOx discharges chain furnace Download PDFInfo
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- CN205227293U CN205227293U CN201520913639.9U CN201520913639U CN205227293U CN 205227293 U CN205227293 U CN 205227293U CN 201520913639 U CN201520913639 U CN 201520913639U CN 205227293 U CN205227293 U CN 205227293U
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- flue gas
- low
- gas recirculation
- blower fan
- furnace
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Abstract
The utility model discloses an adjustable gas recirculation's of many coals adaptability low NO (i) x (i) discharge the chain furnace, its simple structure can utilize present chain furnace betterly, realize in chain furnace middlings combustion processes low NO (i) x (reduced the input cost of equipment when i) discharging, it includes the chain grate furnace betterly, be provided with the feeder on the chain grate furnace, furnace sets up on the chain grate furnace, the last secondary plenum that is provided with of furnace, be provided with the distribution plenum under the chain grate furnace, the air -blower is connected to the distribution plenum, its characterized in that: flue gas circulating fan is connected to the distribution plenum, flue gas circulating fan connects the emission flue.
Description
Technical field
The utility model relates to a kind of boiler, and specifically, it relates to the low NO of the adjustable flue gas recirculation of a kind of many coal adaptabilities
xdischarge chain furnace.
Background technology
Chain furnace is a kind of grate furnace, is the most widely used type of furnace in current industrial boilers in China.Chain furnace is by coal combustion release chemical energy wherein, and heat cycles water makes it be converted into have hot water or the vapours of certain heat energy.
Chain furnace is mainly used among the production run of factory, and mostly is low-altitude discharged, therefore just needs especially to pay close attention to for the pollutant emission control problem in mode chain furnace combustion process.A large amount of NO is had in coal combustion process
xgenerate, and NO
xnot only can cause the atmosphere polluting problem such as acid rain, photochemical fog, and can make a very bad impression to health and animal and plant growth.Therefore, NO in mode chain furnace combustion process is reduced
xgeneration and control combustion after NO
xconcentration of emission of far-reaching significance and great.
But, the NO of the current operating numerous chain furnace of China
xemission control situation is very severe.This is mainly because the NO of chain furnace
xthe development of emission control technique is not yet ripe, NO
xcontrol cost relatively higher, especially to the transformation of existing Industrial Boiler, owing to being subject to, transformation insufficient space, technical support are less, improvement cost is crossed high all factor restrictions and is difficult to smooth realization.
Summary of the invention
The purpose of this utility model is to realize described target above, proposes the low NO of the adjustable flue gas recirculation of a kind of many coal adaptabilities
xdischarge chain furnace, its structure is simple, can utilize existing chain furnace structure preferably, in chain furnace, realize low NO in coal combustion process
xthe input cost of equipment is reduced preferably while discharge.
In order to achieve the above object, the technical scheme that the utility model adopts is:
The low NO of the adjustable flue gas recirculation of a kind of many coal adaptabilities
xdischarge chain furnace, it comprises chain grate furnace, described chain grate furnace is provided with feeder, burner hearth is arranged on described chain grate furnace, described burner hearth is provided with secondary air chamber, and described chain grate furnace is arranged with distribution plenum, and described distribution plenum connects air blast, it is characterized in that: described distribution plenum connects flue gas recirculation blower fan, described flue gas recirculation blower fan connects discharge flue.
It is further characterized in that: described secondary air chamber connects described air blast; Described flue gas recirculation blower fan connects described secondary air chamber;
Described discharge flue comprises high temperature cigarette district and low temperature cigarette district, and described flue gas recirculation blower fan comprises high temperature circulation blower fan and low-temperature circulating blower fan, and described high temperature circulation blower fan connects high temperature cigarette district, and described low-temperature circulating blower fan connects low temperature cigarette district;
Described distribution plenum comprises preignition zone air compartment, primary zone air compartment and burning-out zone air compartment, and described flue gas recirculation blower fan connects described preignition zone air compartment and/or described burning-out zone air compartment;
Described discharge flue is disposed with economizer, air preheater, deduster, described deduster connects chimney by air-introduced machine, described high temperature circulation blower fan is arranged between described burner hearth and described economizer, and described low-temperature circulating blower fan is arranged between described air-introduced machine and described chimney;
Described flue gas recirculation blower fan is connected respectively by unidirectional control valve with between described secondary air chamber, described preignition zone air compartment, described burning-out zone air compartment;
Described air blast is with described preignition zone air compartment, described primary zone air compartment, be connected respectively by unidirectional control valve between described burning-out zone air compartment and described secondary air chamber;
The centre position of described preignition zone air compartment, described burning-out zone air compartment and described secondary air chamber is respectively arranged with tune windshield plate, described tune windshield plate connection of rotating gear.
In said structure of the present utility model, because distribution plenum connects flue gas recirculation blower fan, flue gas recirculation blower fan connects discharge flue, and the distribution plenum that the hypoxemia flue gas in discharge flue is inhaled into preheating under chain grate furnace and burning-out zone mixes with air to be sent into burner hearth afterwards and burn, and effectively realizes low NO
xgeneration, and its structure is the simple transformation carried out original chain furnace, in chain furnace coal combustion process, just can realize low NO
xthe input cost of equipment is reduced preferably while discharge.
Accompanying drawing explanation
Fig. 1 is the low NO of the adjustable flue gas recirculation of the many coal adaptabilities of the utility model
xdischarge chain furnace structural representation.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is described in further detail:
See Fig. 1, the low NO of the adjustable flue gas recirculation of a kind of many coal adaptabilities
xdischarge chain furnace, it comprises chain grate furnace 1, chain grate furnace 1 is provided with feeder 21, burner hearth 2 is arranged on chain grate furnace 1, burner hearth 2 is provided with secondary air chamber 13, chain grate furnace 1 is arranged with distribution plenum 22, distribution plenum 22 is connected air blast 12 with secondary air chamber 13, distribution plenum 22 is connected flue gas recirculation blower fan respectively with secondary air chamber 13, flue gas recirculation blower fan connects discharge flue 3, discharge flue 3 is disposed with economizer 5, air preheater 6, deduster 7, and deduster 7 connects chimney 4 by air-introduced machine 8.
Discharge flue 3 comprises high temperature cigarette district 16 and low temperature cigarette district 17, flue gas recirculation blower fan comprises high temperature circulation blower fan 14 and low-temperature circulating blower fan 15, high temperature circulation blower fan 14 connects high temperature cigarette district 16, low-temperature circulating blower fan 15 connects low temperature cigarette district 17, distribution plenum 22 comprises preignition zone air compartment 9, primary zone air compartment 10 and burning-out zone air compartment 11, preignition zone air compartment 9, primary zone air compartment 10 is connected air blast 12 with burning-out zone air compartment 11, high temperature circulation blower fan 14 is connected preignition zone air compartment 9 with low-temperature circulating blower fan 15, burning-out zone air compartment 11, high temperature circulation blower fan 14 is arranged on (namely in high temperature cigarette district 16) between burner hearth 2 and economizer 5, low-temperature circulating blower fan 15 is arranged on (namely in low temperature cigarette district 17) between air-introduced machine 8 and chimney 4, high temperature cigarette district in discharge flue and hypoxemia flue gas in low temperature cigarette district are inhaled into the pre-burning of chain furnace and burning-out zone and mix with air and send into burner hearth tissue afterwards and burn by high temperature circulation blower fan and low-temperature circulating blower fan respectively, effective suppression fuel type NO
xgeneration, and its structure is the simple transformation carried out original chain furnace, in chain furnace, realize low NO in coal combustion process
xthe input cost of equipment is reduced preferably while discharge.
High temperature circulation blower fan 14 and low-temperature circulating blower fan 15 are connected preignition zone air compartment 9 and/or burning-out zone air compartment 11 respectively, make to discharge in the preignition zone air compartment and/or burning-out zone air compartment that hypoxemia flue gas enters in flue to carry out auxiliary combustion, ensure that low NO
xproduce and emission effect.
High temperature cigarette district in discharge flue and hypoxemia flue gas in low temperature cigarette district introduce in distribution plenum and/or burner hearth and carry out auxiliary combustion by high temperature circulation blower fan and low-temperature circulating blower fan respectively, more ensure that low NO by the adjustment of hypoxemia flue gas in the high temperature cigarette district that sucks high temperature circulation blower fan and low-temperature circulating blower fan and low temperature cigarette district
xproduce and emission effect.
High temperature circulation blower fan 14 is connected respectively by flow control valve 18 with between secondary air chamber 13, preignition zone air compartment 9, burning-out zone air compartment 11 with low-temperature circulating blower fan 15, air blast 12 is with preignition zone air compartment 9, primary zone air compartment 10, be connected respectively by flow control valve 18 between burning-out zone air compartment 11 and secondary air chamber 13, realize the free adjustment of blower fan air output, further ensure that low NO
xproduce and emission effect.
The centre position of preignition zone air compartment 9, burning-out zone air compartment 11 and secondary air chamber 13 is respectively arranged with adjusts windshield plate 19, adjusts windshield plate 19 connection of rotating gear 20, the tune windshield plate 19 controlled by transmitting gear 20.Adjust windshield plate 19 can under the control of transmitting gear 20 clockwise or be rotated counterclockwise certain angle and be fixed on certain angle, control the air supply direction of recirculation hypoxemia flue gas and air thus, control the feeding direction of flue gas recycled and air thus, and then the thermodynamics of control combustion flame in burner hearth distributes and dynamics distribution, ensure that hypoxemia flue gas and air Thorough combustion in chain furnace, thus ensure that low NO
xproduce and emission effect.
Below in conjunction with accompanying drawing, operation principle of the present utility model is described:
To powder: coal dust is sent on chain grate furnace 1 by feeder 21.
Air intake: air sends into preignition zone air compartment 9, primary zone air compartment 10, burning-out zone air compartment 11 and secondary air chamber 13 by air blast 12 through airduct, all has flow control valve 18 to control to adjust flow in each air-supply pipeline.High-temperature flue gas sends into preignition zone air compartment 9, burning-out zone air compartment 11 and secondary air chamber 13 by high temperature circulation blower fan 14, and low-temperature flue gas sends into preignition zone air compartment 9, burning-out zone air compartment 10 and secondary air chamber 13 by low-temperature circulating blower fan 15.
Air-out: the flue gas in chain grate furnace 1 after coal dust firing is sent into chimney 4 by air-introduced machine 8 and entered air after economizer 5, air preheater 6, deduster 7.
In chain furnace, coal is sent on chain grate furnace 1 by feeder 21, enter preignition zone through pre-combustion gas district air compartment 9 successively, main combustion gas district air compartment 10 enter primary zone, burning-out zone air compartment 11 enter burning-out zone generating gasification pre-burning, burning, after-flame after deslagging.Oxygen needed for coal combustion combines dispensing by air blast 12, high temperature circulation blower fan 14 and low-temperature circulating blower fan 15.In the preignition zone of coal combustion, primary zone and burning-out zone, blown by the air distribution air compartment of various combination respectively in each region, and comprise preignition zone air compartment 9, primary zone air compartment 10 and burning-out zone air compartment 11, the burner hearth face arch of chain furnace and rear arch all install secondary air chamber 13.
Flue gas before economizer 5 is introduced burner hearth by high temperature circulation blower fan 14 by airduct by high-temperature flue gas required in combustion process.
Flue gas before chimney 4 is introduced burner hearth by low-temperature circulating blower fan 15 by airduct by low-temperature flue gas required in combustion process, air is directly sent into burner hearth by air blast 12 by air required in combustion process, or sends into burner hearth again after air preheater 6 preheating.
All air-supply pipelines all add flow control valve 18 to control to adjust gas flow.
Pass into recirculation hypoxemia flue gas near coal supply side in preignition zone air compartment 9, and pass into air near side, primary zone, primary zone air compartment 10 is by air blast 12 dispensing air, air is passed near side, primary zone by air blast 12 in burning-out zone air compartment 11, and recirculation hypoxemia flue gas is passed near after-flame side, in secondary air chamber 13, downside passes into air, and upside passes into flue gas recycled.
High temperature circulation blower fan 14, low-temperature circulating blower fan 15, wherein air blast 12 provides air for coal combustion, high temperature circulation blower fan is sent into from drawing the preignition zone of high-temperature flue gas to chain furnace, burning-out zone and secondary blast district before economizer 5, and low-temperature circulating blower fan 15 is sent into from drawing the preignition zone of low-temperature flue gas to chain furnace, burning-out zone and secondary blast district before chimney 4.In combustion process, required oxygen is pressed operating condition by high-temperature flue gas, low-temperature flue gas and air and is regulated supply.
Recirculation hypoxemia flue gas is mixed by high-temperature flue gas and low-temperature flue gas two parts and forms, in the flue gas recycled of different combustion zone, the concrete proportioning of high-temperature flue gas and low-temperature flue gas is determined by Actual combustion operating mode, and is controlled to adjust by the flow control valve 18 of respective pipeline.
Compared with prior art, the utility model has following beneficial effect:
The utility model provides a kind of low NO
xthe mentality of designing of discharge chain furnace.Owing to combining air-supply at coal preignition zone by flue gas recycled and air, thus the different proportion of high-temperature flue gas and low-temperature flue gas in flue gas recycled can be regulated for different coals, and then regulate wind pushing temperature and give oxygen amount, promote different coals can complete under preference temperature preheating and drying and volatile matter release and pre-burning, solve the adaptability problem of chain furnace to coal complicated and changeable.The existence that coal preheating and drying and volatile matter discharge too much oxygen in combustion process can increase NO
xgeneration, and the feeding of low oxygen content flue gas can reduce the participation of oxygen in this process, reduces volatility NO
xgeneration.
Mainly also unburnt coke is in the region of this further burning in primary zone for burning-out zone, so oxygen demand is little, and too much the participation of oxygen can increase NO
xgeneration.Air-supply is combined by flue gas recycled and air in this region, effectively can control the feeding of excessive oxygen amount, both ensure oxygen amount needed for after-flame, can reduce NO again
xgeneration.And, in Coal rank, coke content is different, the residual coke amount entering burning-out zone after the burning of the primary zone of regular length is also not quite similar, the air-supply condition of flexible modulation air, high-temperature flue gas and low-temperature flue gas different content ratio can not only provide for different residual coke amounts oxygen content of blowing targetedly, also wind pushing temperature targetedly can be provided for it, promote the burning of residual coke, after-flame, improve burning of coal utilization ratio in chain furnace, enhance the adaptability of chain furnace for changeable coal dust.
In the air-supply process of preignition zone and burning-out zone, all arrange the air of rich oxygen content to send near the side in primary zone, and arrange the flue gas of low oxygen content to send into away from the side in primary zone.Preignition zone can be regulated like this to be unlikely to excessive with the oxygen concentration in the air-supply of burning-out zone near primary zone relative to the oxygen concentration gap gradient in primary zone, ensure the oxygen concentration atmosphere residing in series of chemical such as experience gasification pre-burning, burning, after-flame etc. of coal successively from low to high, smooth transition from high to low again, ensure that each key reaction stage perfection agrees with, is connected smoothly.
At face arch, the rear arch location arrangements secondary blast of burner hearth, and secondary blast is also the mixed ventilation that temperature is adjustable, oxygen content is adjustable.Due to the volatile matter in the mainly coal that burns in the middle part of the burner hearth above traveling-grate stoker, too high ignition temperature, too much oxygen content can aggravate volatility NO
xgeneration.Therefore, adjustable air-supply condition for the flow of Coal rank, different combustion conditions flexible modulation high-temperature flue gas, low-temperature flue gas, air, and then can provide preference temperature required in volatile combustion process and the condition guarantee of suitable oxygen content.
In the air-supply process of preignition zone, burning-out zone, front and back arch, by the angle and direction adjusting windshield plate to regulate mixing wind feeding.The relative position that can occur for the fuel characteristic of Coal rank and combustion characteristics adjustment burning like this, and then regulate the dynamics of combustion flame in burner hearth to distribute and thermodynamics distribution, thus ensure carrying out smoothly of Coal rank combustion process.Meanwhile, the air-supply of different directions can strengthen turbulence intensity and the level of disruption of air-flow in coal combustion process, promotes the reasonable layout of oxygen in combustion zone, prevents local location from causing NO because oxygen content is too high
xa large amount of generation or local location cause burning insufficient and then cause the generation of a large amount of black smoke because oxygen content is too low.
The utility model devises a kind of investment economy, technique, structure is simple, operation expense is cheap low NO on the basis of original equipment
xthe chain furnace of discharge, and accordingly for optimizing the burning and exhausting of existing chain furnace, the input cost of equipment can be reduced preferably.
Claims (9)
1. the low NO of the adjustable flue gas recirculation of coal adaptability more than a kind
xdischarge chain furnace, it comprises chain grate furnace, described chain grate furnace is provided with feeder, burner hearth is arranged on described chain grate furnace, described burner hearth is provided with secondary air chamber, and described chain grate furnace is arranged with distribution plenum, and described distribution plenum connects air blast, it is characterized in that: described distribution plenum connects flue gas recirculation blower fan, described flue gas recirculation blower fan connects discharge flue.
2. the low NO of the adjustable flue gas recirculation of a kind of many coal adaptabilities according to claim 1
xdischarge chain furnace, is characterized in that: connect air blast described in described secondary air chamber connects.
3. the low NO of the adjustable flue gas recirculation of a kind of many coal adaptabilities according to claim 1
xdischarge chain furnace, is characterized in that: described flue gas recirculation blower fan connects described secondary air chamber.
4. according to the low NO of the arbitrary described adjustable flue gas recirculation of a kind of many coal adaptabilities of claim 1-3
xdischarge chain furnace, it is characterized in that: described discharge flue comprises high temperature cigarette district and low temperature cigarette district, described flue gas recirculation blower fan comprises high temperature circulation blower fan and low-temperature circulating blower fan, and described high temperature circulation blower fan connects high temperature cigarette district, and described low-temperature circulating blower fan connects low temperature cigarette district.
5. the low NO of the adjustable flue gas recirculation of a kind of many coal adaptabilities according to claim 4
xdischarge chain furnace, it is characterized in that: described discharge flue is disposed with economizer, air preheater, deduster, described deduster connects chimney by air-introduced machine, described high temperature circulation blower fan is arranged between described burner hearth and described economizer, and described low-temperature circulating blower fan is arranged between described air-introduced machine and described chimney.
6. the low NO of the adjustable flue gas recirculation of a kind of many coal adaptabilities according to claim 1
xdischarge chain furnace, it is characterized in that: described distribution plenum comprises preignition zone air compartment, primary zone air compartment and burning-out zone air compartment, described flue gas recirculation blower fan connects described preignition zone air compartment and/or described burning-out zone air compartment.
7. the low NO of the adjustable flue gas recirculation of a kind of many coal adaptabilities according to claim 6
xdischarge chain furnace, is characterized in that: described flue gas recirculation blower fan is connected respectively by unidirectional control valve with between described secondary air chamber, described preignition zone air compartment, described burning-out zone air compartment.
8. the low NO of the adjustable flue gas recirculation of a kind of many coal adaptabilities according to claim 6
xdischarge chain furnace, is characterized in that: described air blast is with described preignition zone air compartment, described primary zone air compartment, be connected respectively by unidirectional control valve between described burning-out zone air compartment and described secondary air chamber.
9. according to the low NO of the arbitrary described adjustable flue gas recirculation of a kind of many coal adaptabilities of claim 6-8
xdischarge chain furnace, is characterized in that: the centre position of described preignition zone air compartment, described burning-out zone air compartment and described secondary air chamber is respectively arranged with tune windshield plate, described tune windshield plate connection of rotating gear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520913639.9U CN205227293U (en) | 2015-11-17 | 2015-11-17 | Adjustable gas recirculation's of many coals adaptability low NOx discharges chain furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520913639.9U CN205227293U (en) | 2015-11-17 | 2015-11-17 | Adjustable gas recirculation's of many coals adaptability low NOx discharges chain furnace |
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|---|---|
| CN205227293U true CN205227293U (en) | 2016-05-11 |
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|---|---|---|---|
| CN201520913639.9U Expired - Fee Related CN205227293U (en) | 2015-11-17 | 2015-11-17 | Adjustable gas recirculation's of many coals adaptability low NOx discharges chain furnace |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105240841A (en) * | 2015-11-17 | 2016-01-13 | 无锡华光新动力环保科技股份有限公司 | Multi-coal adaptive low-NOx-emission chain grate furnace capable of adjusting flue gas recirculation |
| CN109442391A (en) * | 2018-09-27 | 2019-03-08 | 哈尔滨工业大学 | It is a kind of to be simple and efficient low-nitrogen discharged grate firing boiler |
| CN112432159A (en) * | 2020-11-20 | 2021-03-02 | 哈尔滨工业大学 | Reverse alpha-shaped flame air distribution type grate-fired furnace combustion system and method |
-
2015
- 2015-11-17 CN CN201520913639.9U patent/CN205227293U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105240841A (en) * | 2015-11-17 | 2016-01-13 | 无锡华光新动力环保科技股份有限公司 | Multi-coal adaptive low-NOx-emission chain grate furnace capable of adjusting flue gas recirculation |
| CN109442391A (en) * | 2018-09-27 | 2019-03-08 | 哈尔滨工业大学 | It is a kind of to be simple and efficient low-nitrogen discharged grate firing boiler |
| CN112432159A (en) * | 2020-11-20 | 2021-03-02 | 哈尔滨工业大学 | Reverse alpha-shaped flame air distribution type grate-fired furnace combustion system and method |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160511 Termination date: 20181117 |
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| CF01 | Termination of patent right due to non-payment of annual fee |