CN202303346U - Low-discharging high-efficient layer combustion combustor - Google Patents
Low-discharging high-efficient layer combustion combustor Download PDFInfo
- Publication number
- CN202303346U CN202303346U CN2011203997911U CN201120399791U CN202303346U CN 202303346 U CN202303346 U CN 202303346U CN 2011203997911 U CN2011203997911 U CN 2011203997911U CN 201120399791 U CN201120399791 U CN 201120399791U CN 202303346 U CN202303346 U CN 202303346U
- Authority
- CN
- China
- Prior art keywords
- combustion chamber
- combusting
- flue gas
- chamber
- communicated
- Prior art date
- 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.)
- Expired - Fee Related
Links
Images
Abstract
The utility model relates to a low-discharging efficient layer combustion combustor, which comprises a combusting chamber and a fire grate. The inner portion of the combusting chamber is divided into a main combusting area, a re-combusting area above the main combusting area and an after-combusting area close to an upper opening of the combusting chamber. The combusting chamber is provided with a smoke discharging port communicated with the main combusting area of the combusting chamber, a recycle smoke nozzle communicated with the re-combusting area of the combusting chamber and a steam nozzle communicated with the inner front end of the combusting chamber and arranged below the recycle smoke nozzle. The recycle smoke nozzle is connected with a rafale pipe mixing bellows arranged outside the combusting chamber, one path of the rafale pipe mixing bellows is communicated with the smoke discharging port, and the other path of the rafale pipe mixing bellows is communicated with a tail gas outlet of the combusting chamber through a circulating fan and a gas-solid separator. A smoke recycle air chamber communicated with the rafale pipe mixing bellows is arranged at the bottom of a part of the fire grate close to a material inlet. By introducing the fuel staged combustion technology into a layer combustion furnace, the low-discharging efficient layer combustion combustor can reduce discharging of NOx and Sox of the layer combustion furnace, and combustion efficiency of the layer combustion furnace is improved by 1-2%.
Description
Technical field
The utility model belongs to the clear energy sources technical field, is specifically related to the efficient grate firing burner of a kind of low emission.
Background technology
Industrial Boiler is to have a large capacity and a wide range in the application characteristic of China, and although about 550,000 of present running Industrial Boiler is along with the raising of development and national economy and living standards of the people; The quantity of fuel oil and gas fired-boiler increases gradually, but because China's fuel is to be main with coal, thereby most of Industrial Boiler is a coal-burning boiler; And mainly be grate furnace; Because aspects such as design and operations, the thermal efficiency of industrial boilers in China is generally lower, in order to improve the thermal efficiency; Normally improve temperature levels in the stove; Impel flameholding, burn-off rate height, but often cause the increase of NOx discharge capacity like this, the NOx discharge capacity that how to reduce small-sized industrial boiler seems urgent day by day.
(application number: 200710120221.2) application discloses a kind of low pollution efficient burning method of grate firing boiler to patent of invention " coal thermal decomposition grate firing apparatus and combustion method thereof ".But the generation that fuel gas that in this patent because grate furnace oxidative pyrolysis chamber produces and granule semicoke can reduce NOx because the pyrolysis chamber is in oxidation environment (air) and the relatively low situation generation of temperature pyrolysis, therefore produces reducing gas (NH
i, HCN, CH
i, H
2With CO etc.) less, and pyrolysis rate is lower, particularly for soft coal, produces reducing gas still less, the reducing NOx DeGrain; This patent influences exerting oneself of boiler owing to the oxidative pyrolysis chamber is set in grate furnace; In addition, the transformation to boiler body in practical applications of this patent is bigger, and construction is difficulty comparatively.Along with the raising day by day of environmental requirement, will be strict more to the NOx discharging, so the industrial usability of this patent is relatively poor, can not satisfy the environmental requirement of increasingly stringent.
Summary of the invention
The purpose of the utility model is to overcome above-mentioned deficiency and provides a kind of low emission efficient grate firing burner, and the technology that this kind device utilizes flue gas recirculation and water spray vapor phase to combine comes rapid pyrolysis coal dust to produce reducing gas (NH
i, HCN, CH
i, H
2With CO etc.); And be used for carrying the reburning zone in reducibility gas and the part granule semicoke entering stove through flue gas recycled; And it is mobile to strengthen the stove internal combustion, reaches the purpose of reducing NOx, and the uncombusted particle burns away above the combustion chamber; In burner hearth, realize stove fuel fractional combustion, can also improve the efficiency of combustion of grate furnace simultaneously.
For realizing above-mentioned purpose, the technical scheme that the utility model is taked is:
The efficient grate firing burner of a kind of low emission; Comprise combustion chamber, fire grate; Be divided into the reburning zone of primary zone, primary zone top in the combustion chamber and near combustion chamber burning-out zone suitable for reading; The combustion chamber is provided with the flue gas export mouth that communicates with the primary zone of combustion chamber, the flue gas recycled nozzle that communicates with the reburning zone of combustion chamber, communicate with the combustion chamber Inner Front End and in the steam jet of flue gas recycled nozzle; The flue gas recycled nozzle connects the outer la farr pipe mixing bellows in combustion chamber, and la farr pipe mixing bellows one tunnel communicate with the flue gas export mouth, leads up to circulating fan, gas-solid separator to export with the tail gas of combustion chamber and communicate; Described fire grate is established the flue gas recirculation air compartment near the part bottom of charging aperture and is communicated with la farr pipe mixing bellows.
Described flue gas recycled nozzle is located at the front end of combustion chamber, and is obliquely installed, and air-flow is flowed to the back lower place by the front upper place.
Described steam jet is connected with steam through the cyclic steam pump.
It is that the middle temperature flue gas recycled of boiler tail and mix from the high temperature flue gas recycled that burner hearth is drawn obtains that grate furnace adopts flue gas recycled; Warm flue gas recycled wherein is because fly ash content is higher; Need to separate back (efficiency of dust collection 60%～80%) through gas-solid separator; Enter in the la farr pipe mixing bellows through circulating fan, middle temperature amount of circulating gas accounts for 15%～25% of global cycle exhaust gas volumn; High temperature circulation flue gas in obtaining after the high temperature flue gas recycled passes through la farr pipe and middle temperature flue gas recycled mixes.In the high temperature circulation flue gas be divided into two strands, wherein one with spray into the rapid pyrolysis coal dust of a spot of steam mating reaction, produce a large amount of reducing gas (NH
i, HCN, CH
i, H
2With CO etc.), another strand is used for carrying reducibility gas through flue gas recycled and part granule semicoke gets into the reburning zone in the stove, and strengthen the stove internal combustion and flow, and reaches the purpose of reducing NOx.The homophase means of chemical reaction of reproducibility reducing NOx is following:
NO and Ammonia (NH in the reducing atmosphere
i) and nitrogen-atoms (N) reaction generation N
2, key reaction has:
NO+NH→N
2+OH (1)
NO+NH
2→N
2+H
2O (2)
NO+N→N
2+O (3)
NO and hydrocarbon root (CH in the reducing atmosphere
i) combination generation cyanogen (HCN)
NO+CH→HC+N (4)
NO+CH
2→HCN+OH (5)
NO+CH
3→HCN+H
2O (6)
HCN and O, OH, H press reaction and generate intermediate product cyanogen oxide:
HCN+O→NCO+H (7)
HCN+OH→HNCO+H (8)
The cyanogen oxide is converted into Ammonia in reducing atmosphere:
NCO+H→NH+CO (9)
HNCO+H→NH
2+CO (10)
NH+H→N+H
2 (11)
NH
2+NH
2→NH
3+NH (12)
The NH that generates
iIn reducing atmosphere, then can NO be reduced to N by formula (1), (2), (3) as running into NO
2
H
2Mainly carry out with the reaction of NO through following reaction path:
H
2+O
2→H+H
2O (13)
H
2+H
2O→H+H+H
2O (14)
H+NO+M→HNO+M (15)
H
2+HNO→H
2O+NH (16)
HNO+H→NH+OH (17)
Under hot conditions, the CO reductive NO is mainly through following reaction:
CO+NO→CO
2+N (18)
The utility model is through introducing grate furnace with flue gas recirculating technique and water spray steam technology; The middle high temperature circulation flue gas (about 600 ℃) that adopts mixing to obtain on the one hand is incorporated into the flue gas recirculation air compartment; With spray into the rapid pyrolysis coal dust of a spot of steam mating reaction, produce a large amount of reducing gas (NHi, HCN, CHi, H
2With CO etc.); On the other hand through be used for carrying the reburning zone in reducibility gas and the part granule semicoke entering stove at face arch design flue gas recycled nozzle; Above the primary zone of combustion chamber, form fuel-rich regions; The NOx that the burning of reduction primary zone generates reduces the conversion of fuel bound nitrogen to NOx, and the uncombusted particle burns away above the combustion chamber; In burner hearth, realize stove fuel fractional combustion, can also improve the efficiency of combustion of grate furnace simultaneously.Described NOx removal efficiency is 35%～55%, and the SOx removal efficiency is more than 80%, and the grate furnace efficiency of combustion improves 1%～2%.
Description of drawings
Fig. 1 the utility model apparatus structure sketch map;
Wherein: 1. hopper, 2. flue gas recycled nozzle, 3. face arch, 4. drum; 5. gas-solid separator, 6. circulating fan, 7. air air compartment, 8. flue gas recirculation air compartment; 9. fire grate, 10. la farr pipe, 11. combustion chambers, 12. flue gas export mouths; 13. steam jet, 14. cyclic steam pumps, I primary zone, II reburning zone, III burning-out zone.
The specific embodiment
The efficient grate firing burner of a kind of low emission; Comprise combustion chamber 11, fire grate 9; Be divided into the reburning zone II of primary zone I, primary zone top in the combustion chamber 11 and near combustion chamber burning-out zone III suitable for reading; The flue gas recycled nozzle 2 that combustion chamber 11 is provided with the steam jet 13 that communicates with the front end of combustion chamber 11, the flue gas export mouth 12 that communicates with the primary zone I of combustion chamber 11, communicates with the reburning zone II of combustion chamber 11; Outer la farr pipe the mixings bellows 10 in flue gas recycled nozzle 2 connection combustion chambers 11, la farr pipe 10 one tunnel communicates with flue gas export mouth 12, leads up to circulating fan 6, gas-solid separator 5 to export with the tail gas of combustion chamber 11 and communicate; Described fire grate 9 is established flue gas recirculation air compartment 8 near the part bottom of charging aperture and is communicated with la farr pipe mixing bellows 10.
Described flue gas recycled nozzle 2 is located at the front end of combustion chamber 11, and is obliquely installed, and air-flow is flowed to the back lower place by the front upper place.
Described steam jet 13 is connected with steam through cyclic steam pump 14.
Coal dust and sulphur-fixing agent fully mixed send into the combustion chamber, coal dust in heating, spray into a spot of steam, rapid pyrolysis takes place down, generation reducing gas (NH in the high temperature flue gas recycled during the bottom feeds simultaneously
i, HCN, CH
i, H
2With CO etc.); Reducing gas that produces and the part granule semicoke that is mingled with enter into the reburning zone under the effect of the middle high temperature recirculated air that sprays into; The NOx that the burning of reduction primary zone generates; The uncombusted particle fires to distinguish in the combustion of combustion chamber and burns away, and the tail gas that produces that burnt extracts warm flue gas recycled in the formation, and middle temperature flue gas recycled mixes the above-mentioned burning use of high temperature flue gas recycled entering combustion chamber confession the formation with the high temperature circulation flue gas of drawing from the primary zone.
Claims (3)
1. efficient grate firing burner of low emission; Comprise combustion chamber, fire grate; It is characterized in that; Be divided into the reburning zone of primary zone, primary zone top in the combustion chamber and near combustion chamber burning-out zone suitable for reading, the combustion chamber is provided with the flue gas export mouth that communicates with the primary zone of combustion chamber, the flue gas recycled nozzle that communicates with the reburning zone of combustion chamber, communicate with the combustion chamber Inner Front End and at the steam jet of flue gas recycled nozzle, the la farr pipe mixing bellows outside the flue gas recycled nozzle connection combustion chamber; La farr pipe mixing bellows one tunnel communicate with the flue gas export mouth, lead up to circulating fan, gas-solid separator to communicate with the tail gas outlet of combustion chamber; Described fire grate is established the flue gas recirculation air compartment near the part bottom of charging aperture and is communicated with la farr pipe mixing bellows.
2. the efficient grate firing burner of low emission according to claim 1 is characterized in that described flue gas recycled nozzle is located at the front end of combustion chamber, and is obliquely installed, and air-flow is flowed to the back lower place by the front upper place.
3. the efficient grate firing burner of low emission according to claim 1 is characterized in that described steam jet is connected with steam through the cyclic steam pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203997911U CN202303346U (en) | 2011-10-19 | 2011-10-19 | Low-discharging high-efficient layer combustion combustor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203997911U CN202303346U (en) | 2011-10-19 | 2011-10-19 | Low-discharging high-efficient layer combustion combustor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202303346U true CN202303346U (en) | 2012-07-04 |
Family
ID=46372233
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203997911U Expired - Fee Related CN202303346U (en) | 2011-10-19 | 2011-10-19 | Low-discharging high-efficient layer combustion combustor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202303346U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102506418A (en) * | 2011-10-19 | 2012-06-20 | 山东大学 | Low emission high efficiency grate-firing combustion device and method |
| CN105276605A (en) * | 2014-07-04 | 2016-01-27 | 烟台龙源电力技术股份有限公司 | Coal-fired boiler and combustion method thereof |
| CN106895431A (en) * | 2016-01-28 | 2017-06-27 | 孟氏锅炉（北京）有限公司 | A kind of water-gas is produced and burns Integrated Combustion method and its combustion apparatus |
| CN111878800A (en) * | 2020-08-04 | 2020-11-03 | 辽宁绿源能源环保科技集团有限责任公司 | Combustion method for micro-flow layer combustion boiler |
-
2011
- 2011-10-19 CN CN2011203997911U patent/CN202303346U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102506418A (en) * | 2011-10-19 | 2012-06-20 | 山东大学 | Low emission high efficiency grate-firing combustion device and method |
| CN105276605A (en) * | 2014-07-04 | 2016-01-27 | 烟台龙源电力技术股份有限公司 | Coal-fired boiler and combustion method thereof |
| CN106895431A (en) * | 2016-01-28 | 2017-06-27 | 孟氏锅炉（北京）有限公司 | A kind of water-gas is produced and burns Integrated Combustion method and its combustion apparatus |
| CN111878800A (en) * | 2020-08-04 | 2020-11-03 | 辽宁绿源能源环保科技集团有限责任公司 | Combustion method for micro-flow layer combustion boiler |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102506418A (en) | Low emission high efficiency grate-firing combustion device and method | |
| CN101839474B (en) | Method for re-circulating combustion of flue gas of pulverized coal fired boiler | |
| CN105387453B (en) | The grate furnace and its burning process of a kind of flue gas recirculation and micronized coal reburning | |
| CN102252320B (en) | Biomass low-nitrogen direct combustion boiler | |
| CN103234196B (en) | A kind of preposition coal gasification grate firing device and combustion method thereof | |
| CN101368724B (en) | Coal thermal decomposition grate firing apparatus and its combustion method | |
| CN202012913U (en) | Novel flue gas self-reflux low-oxygen combustor | |
| CN101721904A (en) | Composite denitration method by biomass direct reburning and selective non-catalytic reduction | |
| CN202884903U (en) | Biomass circulating fluidized bed combustion equipment with low nitrogen oxide emission | |
| CN101050853B (en) | Method for reducing nitrogen oxide of powder coal boiler mixed burning gas fuel | |
| CN104266217B (en) | A kind of grate furnace multipath denitrating system and method for denitration thereof | |
| CN202546811U (en) | Compound furnace arch and compound secondary air structure | |
| CN202303346U (en) | Low-discharging high-efficient layer combustion combustor | |
| CN202109471U (en) | Biomass low-nitrogen direct-fired boiler | |
| CN104696949A (en) | Two-stage process denitrification method of coal fired boiler | |
| CN102679390B (en) | Compound furnace arch and compound secondary air structure for cooperatively controlling generation of nitrogen oxide (NOX) | |
| CN205919352U (en) | Living beings gratefiring boiler is hunch wind combination of flue in a zigzag | |
| CN102980174B (en) | A kind of coal burning and gas burning combined high-efficiency low emission grate-firing combustion device and technique | |
| CN201237236Y (en) | Composite secondary air apparatus for chain boiler combustion | |
| CN203273872U (en) | Front-arranged coal gasification grate firing device | |
| CN202993174U (en) | Fire coal gas combination type high-efficiency low discharge grate firing device | |
| CN202281217U (en) | Micro-emission energy-saving coal-to-gas boiler | |
| CN204880674U (en) | Living beings whirlwind gasification boiler | |
| CN1847373A (en) | Green energy-saving coal combustion promoter | |
| CN109442391A (en) | It is a kind of to be simple and efficient low-nitrogen discharged grate firing boiler |
Legal Events
| 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: 20120704 Termination date: 20171019 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |