CN100346105C - Method for generating multistage reburning controlling high-capacity coal fired boiler NOX - Google Patents
Method for generating multistage reburning controlling high-capacity coal fired boiler NOX Download PDFInfo
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- CN100346105C CN100346105C CNB2004100249561A CN200410024956A CN100346105C CN 100346105 C CN100346105 C CN 100346105C CN B2004100249561 A CNB2004100249561 A CN B2004100249561A CN 200410024956 A CN200410024956 A CN 200410024956A CN 100346105 C CN100346105 C CN 100346105C
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- reburning
- spout
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Abstract
The present invention discloses a method for controlling NOx generation of a large-capacity coal boiler by multi-stage reburning. Multi-stage segmented reburning nozzles are arranged between a primary air nozzle and a final air nozzle on the top of a main burner of the coal boiler in a power plant. The reburned fuel of the reburning nozzles are proportionally fed in multiple stages and segments, and simultaneously the proportion of air quantities for the nozzles in different layers are adjusted, so that a final reburning area is formed at the upmost part of the hearth main burner so as to extend time when pollutant nitrogen oxides are reduced herein. The reburning nozzles are arranged in stages from the primary air nozzle on top of the main burner to bottom. When NOx generated by burning coal powder at coal burning nozzles pass through a first-stage reburning area in the lower layer, the generated partial NOx is reduced into N2 and a plurality of intermediate bodies; when passing through a second-stage reburning area, the NOx is reduced again to N2. Through multi-stage reburning, the present invention can effectively control the NOx generation, obviously reduce NOx exhaust and help to improve and protect the atmospheric environment.
Description
Technical field
The present invention relates to heavy duty boiler pernicious gas control technology field, especially relate to the method that the control considerable coal-fired boiler NOx generates.
Background technology
At present, be that the power plant of raw material is the concentrated area of energy resource consumption with the fire coal, coal generates by the boiler plant burning and the pernicious gas nitrogen oxide (NO of discharging
x) be one of main source that causes now air environmental pollution.How controlling the generation and the discharging of nitrogen oxide effectively, and then improve atmosphere quality, is one of sixty-four dollar question of needing to be resolved hurrily of current society.Existing control coal burning process NO
xThe method of growing amount mainly contains two kinds: the one, restrain NO
xFormation, the 2nd, reduce established NO
xThe multistage combustion method again of fuel is a reductive NO
xEffectively a kind of method in the method; Existing control NO
xMethod have multiple as flue gas recirculation, air classification, fuel staging and burner with low pollution technology etc.Chinese patent application numbers 95120065, open day on October 16th, 1996, a kind of low NOx integrated boiler-burner combined power generation device is disclosed, it comprises level ignition, the self-contained boiler that the assembling of inlet pressure ventilating system and furnace chamber is arranged, one is connected to boiler to the gas turbine of furnace chamber for combustion gas, one multi-injector burner assembly, distribute waste-gas heat to make NOx formation drop to minimum, the nozzle vertical and that level separates of many fuel supplying is contained in furnace chamber import department, one or several cooling tube assembly be contained in the furnace chamber downstream, side direction perforated interior conduit assembly can match separately or with the cooling tube assembly, provide fuel completing combustion required combustion air by different way, blower fan is only supplied the air of air or the mixing of gas turbine combustion gas.Though this burner with low pollution technology application surface is wider, the new unit of especially big capacity, when boiler design is made at NO
xProblem has been changed the structure of former burner, makes it have the characteristic of combustion with reduced pollutants, and effect is more remarkable.But the problem that exists is to implement for existing power plant boiler that this technology need be changed burner, the big input expense of boiler improvement amount is high, has certain degree of difficulty having to promote the use of on the unit, and economic benefit is not high, is difficult to penetration and promotion.
Summary of the invention
The present invention generates in the time of will solving the coal-burning boiler burning of existing power plant and the technical problem of discharge of noxious gases nitrogen oxide (NOx), providing a kind of serves as to transform object with existing coal-fired power plant boiler, utilizes reburning fuel to adopt multistage segmentation to supply with and implements the method that the NOx generation is controlled in combustion with reduced pollutants.
Concrete grammar of the present invention is such realization:
According to the distribution of existing power plant coal-burning boiler main burner on furnace height, adopt the multistage method of reducing that burns again, the combustion zone is divided into primary zone, one-level reburning zone, secondary reburning zone and the district that burnouts from bottom to top successively along boiler furnace, in the primary zone, spray into the coal dust fuel about 75%-85%, excess air coefficient α＞1.0; Lower floor's first order fires that spout is located at the wind snout in main burner top and the second level, upper strata is fired between the spout more again, first order reburning fuel straying quatity is 10%-15%, territory, first order reburning zone forms the reducing atmosphere condition, excess air coefficient α＜1.0, the NOx that the primary zone has been generated is reduced into N
2, HCN and NH; Fire again in the first order and between spout and the after-flame wind snout second level to be set and to fire spout again, the reburning fuel straying quatity is 5%-10%, form the second level and fire the reducing zone again, excess air coefficient α＜1.0, fire again in lower floor's first order on the basis of reduction, be reduced into N once more when nitrogen oxide is through reburning zone, the second level, upper strata in the flue gas
2, prolong the pollutant nitrogen oxide in this time that is reduced; Send into after-flame wind in upper furnace by the after-flame wind snout at last, make imperfect combustion product be able to abundant after-flame.
Lower floor's first order is fired spout and the second level, upper strata again and is fired spout again and can also be separately positioned between wind snout in main burner top and the after-flame wind snout, and secondary reburning fuel straying quatity is respectively 10%-15% and 5%-10%.
Lower floor's first order is fired spout again and is positioned at the main burner top, and apart from 1.0～2.5m place, main burner top, the second level, upper strata is fired spout again and is positioned at lower floor's first order and fires 1.2～2.8m place, spout top again.
Boiler oil divides three grades or multistage supply: main fuel is a coal dust; One-level fuel is reburning fuel; Secondary fuel also is a reburning fuel.
Multistage reburning fuel can adopt fine breeze, natural gas, coke-stove gas, liquefied petroleum gas and other hydrocarbon fuels.
The present invention adopts the reburning fuel multipolarity to supply with, between main burner spout and after-flame wind snout, transform installation reburning spout along the boiler furnace height, make the multistage in proportion supply of reburning fuel, adjust the proportioning of each layer wind simultaneously, and the after-flame wind snout is set at the boiler furnace topmost.The remarkable advantage that is had is the limitation that has overcome original technology, has prolonged the time of staying of flue gas in the reducing zone, by the multistage reducing NOx that fires again, the amount of nitrogen oxides behind the coal burning is obviously reduced, and helps protecting atmospheric environment.And can not add any new equipment to existing coal-burning boiler, promptly on the basis of existing equipment, appropriateness is transformed the function of some burner nozzle of change and just can be implemented.Therefore, the present invention not only has the social benefit of significant protection environment, also has considerable economic simultaneously.
Description of drawings
Fig. 1 is a classification of the present invention theory of combustion schematic diagram again.
The specific embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
Multistage segmentation combustion technology is again implemented on the power plant boiler main burner.As shown in Figure 1, be divided into main combustion zone 5, one-level reburning zone 4, secondary reburning zone 3 from bottom to top successively and burnout district 2 along boiler furnace 1.A kind of method is to spray into coal dust fuel about 75%-85%, excess air coefficient α＞1.0 in main combustion zone 5 by the main burner spout; Lower floor's first order is fired spout again and is located on the wind snout in main burner top, first order reburning fuel straying quatity is about 10%-15%, form the reducing atmosphere condition in territory, first order reburning zone, excess air coefficient α slightly＜1.0 NOx that primary zone 5 has been generated is running into hydrocarbon root CH
iDeng and last completing combustion product C O, H
2, C and C
nH
mThe time, be reduced into N
2, HCN and NH
iDeng; Fire again in the first order and between spout and the after-flame spout second level, upper strata to be set and to fire spout again, the reburning fuel straying quatity is about 5%-10%, form the second level and fire the reducing zone again, excess air coefficient α＜1.0, fire again in lower floor's first order on the basis of reduction, be reduced into N once more when nitrogen oxide is through reburning zone 3, the second level, upper strata in the flue gas
2Deng, prolong the pollutant nitrogen oxide in this time that is reduced, the final growing amount of nitrogen oxide is effectively controlled and obviously reduction.Send into after-flame wind on burner hearth 1 top by the after-flame wind snout at last, excess air coefficient α＞1.0 make imperfect combustion product at this abundant after-flame.
Another kind method is lower floor's first order to be fired spout and the second level, upper strata again fire spout again and be separately positioned between wind snout in main burner top and the after-flame wind snout, and secondary reburning fuel straying quatity is respectively 10%-15% and 5%-10%.Lower floor's first order is fired spout again and is positioned at the main burner top, and apart from 1.0～2.5m place, main burner top, the second level, upper strata is fired spout again and is positioned at lower floor's first order and fires 1.2～2.8m place, spout top again.
Boiler oil divides three grades or multistage supply: main fuel is a coal dust; One-level fuel is reburning fuel; Secondary fuel also is a reburning fuel.Wherein multistage reburning fuel can adopt fine breeze, natural gas, coke-stove gas, liquefied petroleum gas and other hydrocarbon fuels such as light diesel fuel etc.
Because multistage reburning is divided into a plurality of zones from bottom to top along boiler furnace 1, to consider to leave enough space mounting reburning fuel spouts during therefore actual enforcement on burner top, perhaps the large coal-fired boiler that itself has multilayer burning spout is transformed, make upper strata burning spout transform the reburning fuel spout as, and make flue gas guarantee to have enough residence times in reburning zone and burning-out zone.
Claims (3)
1, the method that a kind of multistage control of combustion again considerable coal-fired boiler NOx generates, adopt the multistage method of reducing that burns again, the combustion zone is divided into primary zone (5), one-level reburning zone (4), secondary reburning zone (3) and the district (2) that burnouts from bottom to top successively along boiler furnace (1), it is characterized in that, in primary zone (5), spray into the coal dust fuel of 75%-85%, excess air coefficient α＞1.0; Lower floor's first order fires that spout is located at the wind snout in main burner top and the second level, upper strata is fired between the spout more again, first order reburning fuel straying quatity is 10%-15%, territory, first order reburning zone forms the reducing atmosphere condition, excess air coefficient α＜1.0, the NOx that primary zone (5) has been generated is reduced into N
2, HCN and NH; Fire again in the first order and between spout and the after-flame wind snout second level to be set and to fire spout again, the reburning fuel straying quatity is 5%-10%, form the second level and fire the reducing zone again, excess air coefficient α＜1.0, fire again in lower floor's first order on the basis of reduction, be reduced into N once more when nitrogen oxide is through reburning zone, the second level, upper strata in the flue gas
2, prolong the pollutant nitrogen oxide in this time that is reduced; Send into after-flame wind in upper furnace by the after-flame wind snout at last, make imperfect combustion product be able to abundant after-flame.
2. the method that considerable coal-fired boiler NOx generates is controlled in described multistage combustion again according to claim 1, it is characterized in that: lower floor's first order is fired spout again and is positioned at the main burner top, apart from 1.0～2.5m place, main burner top, the second level, upper strata is fired spout again and is positioned at lower floor's first order and fires 1.2～2.8m place, spout top again.
3. the method that generates according to the described multistage control of the combustion again considerable coal-fired boiler NOx of claim 1 is characterized in that: multistage reburning fuel employing fine breeze, natural gas, coke-stove gas, liquefied petroleum gas and other hydrocarbon fuels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100249561A CN100346105C (en) | 2004-06-07 | 2004-06-07 | Method for generating multistage reburning controlling high-capacity coal fired boiler NOX |
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|---|---|---|---|
| CNB2004100249561A CN100346105C (en) | 2004-06-07 | 2004-06-07 | Method for generating multistage reburning controlling high-capacity coal fired boiler NOX |
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|---|---|
| CN1584396A CN1584396A (en) | 2005-02-23 |
| CN100346105C true CN100346105C (en) | 2007-10-31 |
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1312430C (en) * | 2005-04-06 | 2007-04-25 | 哈尔滨工业大学 | Biomass and powder coal mixed combustion and biomass recombusting and denitrating combustion apparatus |
| CN100400962C (en) * | 2005-10-14 | 2008-07-09 | 浙江大学 | Method for reburning nitrogen oxides by coal combustion boiler and apparatus thereof |
| CN100387902C (en) * | 2006-02-21 | 2008-05-14 | 西安热工研究院有限公司 | Novel three-region two-stage overfire air arrangement mode for wall type boiler |
| CN101055075B (en) * | 2006-04-14 | 2010-12-08 | 同济大学 | Method for reducing coal-firing boiler NOx discharge and its implementing device |
| CN100504164C (en) * | 2006-06-30 | 2009-06-24 | 中国科学院工程热物理研究所 | Coal firing method with low emission for nitrous oxides |
| CN100445636C (en) * | 2006-11-28 | 2008-12-24 | 南京师范大学 | Method for reducing NOx discharge by using mixed powdered coal and biomass in re-combustion zone and boiler system |
| KR100814940B1 (en) * | 2007-09-06 | 2008-03-19 | 한국기계연구원 | Thermal power plant having pure oxygen combustor |
| CN100593671C (en) * | 2007-12-28 | 2010-03-10 | 上海电力学院 | Method for reducing elemental mercury, nitrogen oxide discharging for coal-fired boiler classified recombustion |
| CN102003701B (en) * | 2010-11-23 | 2012-12-26 | 浙江大学 | Low NOx coal dust combustion method and device based on underfire air and overfire air |
| TWI435036B (en) * | 2011-10-06 | 2014-04-21 | Long Chen Paper Co Ltd | Combustion system with low nitrogen oxides emission |
| CN104748147B (en) * | 2015-02-28 | 2017-03-01 | 烟台龙源电力技术股份有限公司 | The combustion method of wall face-fired boiler |
| CN106215664B (en) * | 2016-08-31 | 2022-07-08 | 重庆赛迪热工环保工程技术有限公司 | Combined denitration method and device for flue gas of hazardous waste incineration system |
| CN106895393A (en) * | 2017-02-22 | 2017-06-27 | 首钢京唐钢铁联合有限责任公司 | A kind of mixed gas fire low nitrogen burning system again |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58213106A (en) * | 1982-06-03 | 1983-12-12 | Babcock Hitachi Kk | Combustion device |
| EP0512156A1 (en) * | 1991-05-07 | 1992-11-11 | Ente Nazionale Per L'energia Elettrica - (Enel) | A process for reducing nitric oxides in a flue gas |
| US5756059A (en) * | 1996-01-11 | 1998-05-26 | Energy And Environmental Research Corporation | Advanced reburning methods for high efficiency NOx control |
| WO1999008045A1 (en) * | 1997-08-08 | 1999-02-18 | Gas Research Institute | Nitrogen oxide reduction by gaseous fuel injection in low temperature, overall fuel-lean flue gas |
| WO2001094843A1 (en) * | 2000-06-08 | 2001-12-13 | Clearstack Combustion Corporation | Low nitrogen oxides emissions using three stages of fuel oxidation and in-situ furnace flue gas recirculation |
| CN1415891A (en) * | 2001-10-31 | 2003-05-07 | 清华大学 | Combustion method and device for denitration by refueling pyrolysis gas of biomass |
-
2004
- 2004-06-07 CN CNB2004100249561A patent/CN100346105C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58213106A (en) * | 1982-06-03 | 1983-12-12 | Babcock Hitachi Kk | Combustion device |
| EP0512156A1 (en) * | 1991-05-07 | 1992-11-11 | Ente Nazionale Per L'energia Elettrica - (Enel) | A process for reducing nitric oxides in a flue gas |
| US5756059A (en) * | 1996-01-11 | 1998-05-26 | Energy And Environmental Research Corporation | Advanced reburning methods for high efficiency NOx control |
| WO1999008045A1 (en) * | 1997-08-08 | 1999-02-18 | Gas Research Institute | Nitrogen oxide reduction by gaseous fuel injection in low temperature, overall fuel-lean flue gas |
| WO2001094843A1 (en) * | 2000-06-08 | 2001-12-13 | Clearstack Combustion Corporation | Low nitrogen oxides emissions using three stages of fuel oxidation and in-situ furnace flue gas recirculation |
| CN1415891A (en) * | 2001-10-31 | 2003-05-07 | 清华大学 | Combustion method and device for denitration by refueling pyrolysis gas of biomass |
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| CN1584396A (en) | 2005-02-23 |
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