CN101021316A - Method and device of denitration utilizing biomass direct burning and re-burning as well as smoke gas recirculating technology - Google Patents

Method and device of denitration utilizing biomass direct burning and re-burning as well as smoke gas recirculating technology Download PDF

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Publication number
CN101021316A
CN101021316A CN 200710071882 CN200710071882A CN101021316A CN 101021316 A CN101021316 A CN 101021316A CN 200710071882 CN200710071882 CN 200710071882 CN 200710071882 A CN200710071882 A CN 200710071882A CN 101021316 A CN101021316 A CN 101021316A
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China
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combustion
zone
coal
biomass
nox
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CN 200710071882
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Chinese (zh)
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CN100491822C (en
Inventor
吴少华
刘辉
孙绍增
邱朋华
孙锐
秦明
李争起
秦裕琨
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哈尔滨工业大学
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Abstract

The present invention belongs to a denitration method by utilizing biomass direct combustion and secondary combustion and flue gas recirculating process and its equipment, and relates to a coal powder boiler low NOx combustion process and its equipment. The invented method includes the following steps: making coal powder be passed through the combustor of coal powder boiler and fed into main combustion zone to make combustion and form the flue gas containing NOx; utilizing the mixture of once air and recirculating tail portion flue gas to spray biomass particles into secondary combustion reduction zone and make NOx formed in the main combustion zone be reacted and formed into N2; at the same time make the biomass coke ad NOx produce isophase reduction reaction to form Nz; spraying burning air from upper portion of secondary combustion reduction zone to make non-burnt combustible material be burnt up.

Description

Utilize the method and the device of biomass direct-fired combustion again and smoke gas recirculating technology denitration

Technical field

The present invention relates to pulverized-coal fired boiler low NOx combusting technology and device thereof, refer more particularly to the combustion method and the device that utilize biomass direct-fired denitration by refueling.

Background technology

Coal dust firing is the important source that forms discharged nitrous oxides, and the denitration efficiency of low NOx combusting technologies such as existing low excess air coefficient, air classification combustion technology and dense-dilute burner combustion technology generally is lower than 50%, therefore can not satisfy the environmental requirement of increasingly stringent.Combustion technology is called fuel staging or furnace reduction (IFNR) technology again again, and it is to reduce in many stoves of NOx discharging in the method one of effective measures, and the denitration efficiency of combustion technology can reach more than 60% again.At present domestic and international existing denitration by refueling project mostly with natural gas as reburning fuel, also have part with fine breeze as reburning fuel.The natural gas resource of China mainly is distributed in western part, and reserves are limited, adopts natural gas as reburning fuel, and operating cost is higher.The fine coal powder recombustion denitrificating technology is to the coal and the granularity of coal-fired powder all have strict requirement again.

Summary of the invention

The biomass direct-fired combustion again and the step of the method for smoke gas recirculating technology denitration utilized provided by the invention is:

A, coal dust enter the flue gas that the burning formation of coal-powder boiler burner hearth bottom primary zone contains NOx by the burner of coal-powder boiler;

B, the mixture that utilizes wind to mix the tail flue gas of recirculation spray into the burner hearth middle part with biological particles, form and fire the reducing zone again;

C, biological particles separate out hydrocarbon-based, amino isoreactivity group firing under the low stoichiometric ratio condition in reducing zone again, and the NOx reaction that forms with the coal-powder boiler primary zone forms N 2, biomass coke and NOx are firing reducing zone generation out-phase reduction reaction more simultaneously, and the NOx that the primary zone is produced is reduced into N 2

D, spray into after-flame wind, form burning-out zone, make imperfect combustion combustible completing combustion from top, the reducing zone of the combustion again after-flame wind snout of coal-powder boiler burner hearth.

Wherein the primary zone excess air coefficient described in the steps A is 0.8~1.0.

The ratio of the tail flue gas in the mixture of the tail flue gas that 30 mixing of a wind described in the step B recycle is 0%~100%.

Wherein the reducing zone of the combustion again excess air coefficient described in the step C is 0.8~0.9.

Wherein the burning-out zone excess air coefficient described in the step D is 1.15~1.2.

In said method, the caloric value of coal accounts for 80~90% in the coal-powder boiler burner hearth, and the caloric value of living beings accounts for 10~20%.

In step B of the present invention, utilize a wind living beings to be sprayed into and fire the reducing zone again with the mixture that recycles tail flue gas, so not only help forming the condition of firing required low stoichiometric ratio again, can also enhanced biological matter jet rigidity and fire reducing zone mixing condition again.

Be used to realize the device of biomass direct-fired combustion again of utilizing of said method and smoke gas recirculating technology denitration, by biomass feeding apparatus, pulverized-coal fired boiler with and between connection and recirculation air-introduced machine form, the discharging opening of described biomass feeding apparatus and primary air intake pipe road are communicated with, one end in primary air intake pipe road and reburning fuel spout connection, the air inlet of recirculation air-introduced machine and the back-end ductwork of pulverized-coal fired boiler are communicated with, and the air outlet and the primary air intake pipe road of recirculation air-introduced machine are communicated with.

The advantage that the present invention has compared with the prior art has:

With the pumped (conveying) medium of afterbody flue gas recycled as recombustion of biomass fuel, help forming and fire the low stoichiometric ratio condition that the reducing zone requires again, simultaneously can strengthen the rigidity of firing spout living beings jet again, strengthen the mixing condition of firing the reducing zone again, reduction helps the reduction reaction of the NOx of CHi, NHi isoreactivity group and primary zone formation to the requirement of living beings kind and physical parameter.

Particle after the present invention directly utilizes living beings to pulverize is as reburning fuel, meet country about the efficient comprehensive exploitation of biomass energy with utilize policy, living beings are rationally utilized with combustion technology again combine, the technical risk and the cost of living beings conversion processes have been reduced, substantially do not influencing under the condition of the original combustion position of coal-powder boiler, effectively reducing the discharging of nitrogen oxide.

The present invention is applicable to newly constructed boiler, and to the transformation at the fortune boiler.

Description of drawings

Fig. 1 is the structural representation that utilizes the device of biomass direct-fired combustion again and smoke gas recirculating technology denitration of the present invention.

The specific embodiment

The specific embodiment one: the method for utilizing biomass direct-fired combustion again and smoke gas recirculating technology denitration of present embodiment, concrete steps are:

A, coal dust enter the flue gas that coal-powder boiler burner hearth bottom primary zone X burning formation contains NOx by the burner 21 of coal-powder boiler;

B, the mixture that utilizes wind 30 to mix the tail flue gas of recirculation spray into the burner hearth middle part with biological particles, form and fire reducing zone Y again;

C, biological particles separate out hydrocarbon-based, amino isoreactivity group, the NOx reaction formation N that becomes with coal-powder boiler primary zone X-shaped firing under the low stoichiometric ratio condition of reducing zone Y again 2, biomass coke and NOx are firing reducing zone Y generation out-phase reduction reaction more simultaneously, and the NOx that primary zone X is produced is reduced into N 2

D, spray into after-flame wind 31, form burning-out zone Z, make imperfect combustion combustible completing combustion from the after-flame wind snout 23 that fires Y top, reducing zone again of coal-powder boiler burner hearth.

At the primary zone X excess air coefficient described in the steps A is 0.8~1.0.

The ratio of the tail flue gas in the mixture of the tail flue gas that 30 mixing of a wind described in the step B recycle is 0%~100%.

At the reducing zone of the combustion again Y excess air coefficient described in the step C is 0.8~0.9.

At the burning-out zone Z excess air coefficient described in the step D is 1.15~1.2.

In said method, the caloric value of coal accounts for 80~90% in the coal-powder boiler burner hearth, and the caloric value of living beings accounts for 10~20%.

In described step B, the mixture that utilizes wind 30 to mix the tail flue gas of recirculation sprays into biological particles and fires reducing zone Y again, so not only help forming the condition of firing required low stoichiometric ratio again, can also enhanced biological matter jet rigidity and fire reducing zone Y mixing condition again.

The device that is used for biomass direct-fired combustion again of utilizing of this method and smoke gas recirculating technology denitration, by biomass feeding apparatus 1, pulverized-coal fired boiler 2 with and between connection and recirculation air-introduced machine 3 form, the discharging opening of described biomass feeding apparatus 1 and primary air intake pipe road 4 are communicated with, one end in primary air intake pipe road 4 and reburning fuel spout 22 are communicated with, the air inlet of recirculation air-introduced machine 3 and the back-end ductwork of pulverized-coal fired boiler 2 27 are communicated with, and the air outlet of recirculation air-introduced machine 3 and primary air intake pipe road 4 are communicated with.

The burner hearth of existing pulverized-coal fired boiler 2 is divided into primary zone X, fires reducing zone Y and burning-out zone Z again.Present embodiment utilization cheapness, the living beings that are easy to get are simply pulverized the processing back as the raw material that fires again, adopt recirculation tail flue gas and wind 30 mixing pumped (conveying) medium as living beings, not only can strengthen the rigidity of firing spout 22 jets again, the mixing condition that reducing zone Y is fired in reinforcement again, also help CHi, NHi isoreactivity group become NOx with the primary zone X-shaped reduction reaction.Fire living beings that reducing zone Y sprays into again under the low excess air coefficient condition, imperfect combustion forms the stable reducing zone of combustion again Y reducing atmosphere, and alkali metal oxides such as the potassium in the living beings, sodium have good catalytic action to the NOx reduction reaction simultaneously.After the flue gas that contains NOx that the primary zone X-shapeds become in the coal-powder boiler 2 enters and fires reducing zone Y again, the NOx in the flue gas with fire the volatile matter that living beings that spout 22 sprays into separate out again same phase reaction take place, the biomass coke generation out-phase reaction with separating out volatile matter forms and contains N 2Gas.After this gas enters burning-out zone Z, owing to there is after-flame wind 31 to spray into this district through after-flame wind snout 23, therefore from the further burning of unburnt combustible in the flue gas that fires reducing zone Y again in this district, the flue gas of heat carries out heat exchange through superheater 24, economizer 25, air preheater 26 respectively,, under the effect of exhaust blower, discharge through chimney after deduster 28 purifies.The inlet of recirculation air-introduced machine 3 can and air preheater 26 be communicated with back-end ductwork between the deduster 28, perhaps with air preheater 26 27 sections connections of back-end ductwork before.Because the part pumped (conveying) medium of biological particles has replenished the part tail flue gas, so the present invention has realized the dual-use function of recombustion of biomass denitration and flue gas recirculation denitration.

The specific embodiment two: the biomass direct-fired combustion again that utilizes of present embodiment is with the device of smoke gas recirculating technology denitration and the difference of the specific embodiment one, described charging gear 1 is made up of feed hopper 11 and auger 12, described auger 12 is fixed on the bottom in the feed hopper 11, and the outlet of auger 12 is communicated with primary air intake pipe road 4.

The specific embodiment three: the biomass direct-fired combustion again that utilizes of present embodiment is with the device of smoke gas recirculating technology denitration and the difference of the specific embodiment one, also comprise living beings reducing mechanism 5 and bury scraper lifting machine 6, the outlet of described living beings reducing mechanism 5 is connected with the inlet of biomass feeding apparatus 1 by burying scraper lifting machine 6.Living beings are transported in the biomass feeding apparatus 1 by burying scraper lifting machine 6 after pulverizing by living beings reducing mechanism 5.

Claims (8)

1, utilize the method for biomass direct-fired combustion again and smoke gas recirculating technology denitration, it is characterized in that its concrete steps are:
A, coal dust enter the flue gas that coal-powder boiler burner hearth bottom primary zone (X) burning formation contains NOx by the burner (21) of coal-powder boiler;
B, the mixture that utilizes a wind (30) to mix the tail flue gas of recirculation spray into the burner hearth middle part with biological particles, form and fire reducing zone (Y) again;
C, biological particles separate out hydrocarbon-based, amino isoreactivity group firing under the low stoichiometric ratio condition in reducing zone (Y) again, and the NOx reaction that forms with coal-powder boiler primary zone (X) forms N 2, biomass coke and NOx are firing reducing zone (Y) generation out-phase reduction reaction more simultaneously, and the NOx that primary zone (X) produced is reduced into N 2
D, spray into after-flame wind (31), form burning-out zone (Z), make imperfect combustion combustible completing combustion from the after-flame wind snout (23) on the top, the reducing zone of combustion again (Y) of coal-powder boiler burner hearth.
2, the method for utilizing biomass direct-fired combustion again and smoke gas recirculating technology denitration according to claim 1 is characterized in that at primary zone (X) excess air coefficient described in the described steps A be 0.8~1.0.
3, the method for utilizing biomass direct-fired combustion again and smoke gas recirculating technology denitration according to claim 1 is characterized in that at the reducing zone of combustion again (Y) excess air coefficient described in the described step C be 0.8~0.9.
4, the method for utilizing biomass direct-fired combustion again and smoke gas recirculating technology denitration according to claim 1 is characterized in that at burning-out zone (Z) excess air coefficient described in the described step D be 1.15~1.2.
5, the method for utilizing biomass direct-fired combustion again and smoke gas recirculating technology denitration according to claim 1 is characterized in that the caloric value of coal in the coal-powder boiler burner hearth accounts for 80~90%, and the caloric value of living beings accounts for 10~20%.
6, utilize the device of biomass direct-fired combustion again and smoke gas recirculating technology denitration, comprise pulverized-coal fired boiler (2), it is characterized in that it also comprises biomass feeding apparatus (1), with and with pulverized-coal fired boiler (2) between be connected and recycle air-introduced machine (3), the discharging opening of described biomass feeding apparatus (1) and primary air intake pipe road (4) are communicated with, one end in primary air intake pipe road (4) and reburning fuel spout (22) are communicated with, the air inlet of recirculation air-introduced machine (3) and the back-end ductwork (27) of pulverized-coal fired boiler (2) are communicated with, and the air outlet of recirculation air-introduced machine (3) and primary air intake pipe road (4) are communicated with.
7, the device that utilizes biomass direct-fired combustion again and smoke gas recirculating technology denitration according to claim 6, it is characterized in that described charging gear (1) is made up of feed hopper (11) and auger (12), described auger (12) is fixed on the bottom in the feed hopper (11), and the outlet of auger (12) is communicated with primary air intake pipe road (4).
8, the device that utilizes biomass direct-fired combustion again and smoke gas recirculating technology denitration according to claim 6, it is characterized in that it also comprises living beings reducing mechanism (5) and buries scraper lifting machine (6), the outlet of described living beings reducing mechanism (5) is connected with the inlet of biomass feeding apparatus (1) by burying scraper lifting machine (6).
CNB2007100718820A 2007-03-14 2007-03-14 Method of denitration utilizing biomass direct burning and smoke gas recirculating technology CN100491822C (en)

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CN101839474A (en) * 2010-06-22 2010-09-22 华中科技大学 Method for re-circulating combustion of flue gas of pulverized coal fired boiler
CN101839476A (en) * 2010-06-22 2010-09-22 华中科技大学 Method for micro positive pressure oxygen-enriched combustion of pulverized coal
CN101761920B (en) * 2009-12-16 2012-07-04 上海理工大学 Method and device for burning low NOx by utilizing reburning of pulverized coal pyrolysis gas
CN102607049A (en) * 2012-03-20 2012-07-25 安徽省科捷再生能源利用有限公司 Technology for combusting pulverized coal fed by circulating air for industrial boiler
CN102777891A (en) * 2012-07-19 2012-11-14 无锡华光锅炉股份有限公司 Furnace combustion structure for reducing NOx (nitrogen oxide) discharge
CN103148476A (en) * 2013-03-11 2013-06-12 西安交通大学 Flue gas recirculation boiler system burning fuel with high sodium and potassium contents
CN103604116A (en) * 2013-11-22 2014-02-26 张建存 Device and method for reducing oxynitrides smoke product of circulating fluidized bed boiler
CN103851603A (en) * 2014-03-17 2014-06-11 山西新唐工程设计有限公司 Compact distributed coal powder boiler with SCR (selective catalytic reduction device)
CN104566350A (en) * 2014-12-31 2015-04-29 国家电网公司 Fly ash recirculation system capable of reducing boiler coking
CN105276574A (en) * 2008-06-25 2016-01-27 阿尔斯托姆科技有限公司 Furnace system with internal flue gas recirculation
CN105351957A (en) * 2015-12-14 2016-02-24 嘉兴华清能源科技有限公司 Novel biomass particle combustion boiler system
CN105387452A (en) * 2015-12-14 2016-03-09 嘉兴华清能源科技有限公司 Biomass particle combustion boiler system capable of realizing automatic control
CN105435615A (en) * 2015-12-15 2016-03-30 盐城市兰丰环境工程科技有限公司 Method for recycling cement kiln SNCR denitrification reducing agent
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CN106482093A (en) * 2016-11-30 2017-03-08 东方电气集团东方锅炉股份有限公司 Face-fired boiler and the flue gas recirculation combustion system with the boiler
CN107388221A (en) * 2017-07-17 2017-11-24 四川竹根锅炉股份有限公司 A kind of ultralow nitrogen condensation horizontal steam boiler of four backhauls
CN107420887A (en) * 2017-07-14 2017-12-01 光大环境科技(中国)有限公司 The biomass direct-fired device that oxygen-enriched combusting and flue gas recirculation are combined
CN108351099A (en) * 2015-10-19 2018-07-31 贝尔泰利联合公司 Reduce the method for the noxious gas emission object for the gas fired-boiler for having Packed forced ventilation combustion chamber and corresponding boiler
CN106247320B (en) * 2016-07-29 2018-08-24 东方电气集团东方锅炉股份有限公司 A kind of opposed firing boiler depth denitration combustion method
CN109869712A (en) * 2019-02-28 2019-06-11 兖矿集团有限公司 A kind of modified coal fires the system and its processing method of desulphurization denitration again
CN110540887A (en) * 2019-09-02 2019-12-06 山西大学 preparation method and application of nitridized biomass advanced reburning denitration agent

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CN105276574A (en) * 2008-06-25 2016-01-27 阿尔斯托姆科技有限公司 Furnace system with internal flue gas recirculation
CN101761920B (en) * 2009-12-16 2012-07-04 上海理工大学 Method and device for burning low NOx by utilizing reburning of pulverized coal pyrolysis gas
CN101839474A (en) * 2010-06-22 2010-09-22 华中科技大学 Method for re-circulating combustion of flue gas of pulverized coal fired boiler
CN101839476A (en) * 2010-06-22 2010-09-22 华中科技大学 Method for micro positive pressure oxygen-enriched combustion of pulverized coal
CN102607049A (en) * 2012-03-20 2012-07-25 安徽省科捷再生能源利用有限公司 Technology for combusting pulverized coal fed by circulating air for industrial boiler
CN102777891A (en) * 2012-07-19 2012-11-14 无锡华光锅炉股份有限公司 Furnace combustion structure for reducing NOx (nitrogen oxide) discharge
CN103148476A (en) * 2013-03-11 2013-06-12 西安交通大学 Flue gas recirculation boiler system burning fuel with high sodium and potassium contents
CN103148476B (en) * 2013-03-11 2016-01-20 西安交通大学 A kind of flue gas recirculation steam generator system using high sodium potassium content fuel
CN103604116A (en) * 2013-11-22 2014-02-26 张建存 Device and method for reducing oxynitrides smoke product of circulating fluidized bed boiler
CN103851603A (en) * 2014-03-17 2014-06-11 山西新唐工程设计有限公司 Compact distributed coal powder boiler with SCR (selective catalytic reduction device)
CN104566350A (en) * 2014-12-31 2015-04-29 国家电网公司 Fly ash recirculation system capable of reducing boiler coking
CN108351099A (en) * 2015-10-19 2018-07-31 贝尔泰利联合公司 Reduce the method for the noxious gas emission object for the gas fired-boiler for having Packed forced ventilation combustion chamber and corresponding boiler
CN105387452A (en) * 2015-12-14 2016-03-09 嘉兴华清能源科技有限公司 Biomass particle combustion boiler system capable of realizing automatic control
CN105351957A (en) * 2015-12-14 2016-02-24 嘉兴华清能源科技有限公司 Novel biomass particle combustion boiler system
CN105435615A (en) * 2015-12-15 2016-03-30 盐城市兰丰环境工程科技有限公司 Method for recycling cement kiln SNCR denitrification reducing agent
CN106247321A (en) * 2016-07-29 2016-12-21 东方电气集团东方锅炉股份有限公司 A kind of W flame boiler for deeply denitration combustion method
CN106247320B (en) * 2016-07-29 2018-08-24 东方电气集团东方锅炉股份有限公司 A kind of opposed firing boiler depth denitration combustion method
CN106482093A (en) * 2016-11-30 2017-03-08 东方电气集团东方锅炉股份有限公司 Face-fired boiler and the flue gas recirculation combustion system with the boiler
CN106482093B (en) * 2016-11-30 2020-02-11 东方电气集团东方锅炉股份有限公司 Opposed firing boiler and flue gas recirculation combustion system using same
CN107420887A (en) * 2017-07-14 2017-12-01 光大环境科技(中国)有限公司 The biomass direct-fired device that oxygen-enriched combusting and flue gas recirculation are combined
CN107388221A (en) * 2017-07-17 2017-11-24 四川竹根锅炉股份有限公司 A kind of ultralow nitrogen condensation horizontal steam boiler of four backhauls
CN109869712A (en) * 2019-02-28 2019-06-11 兖矿集团有限公司 A kind of modified coal fires the system and its processing method of desulphurization denitration again
CN110540887A (en) * 2019-09-02 2019-12-06 山西大学 preparation method and application of nitridized biomass advanced reburning denitration agent

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