CN102658026A - Denitration system capable of jetting biomass coke - Google Patents

Denitration system capable of jetting biomass coke Download PDF

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Publication number
CN102658026A
CN102658026A CN2012101734709A CN201210173470A CN102658026A CN 102658026 A CN102658026 A CN 102658026A CN 2012101734709 A CN2012101734709 A CN 2012101734709A CN 201210173470 A CN201210173470 A CN 201210173470A CN 102658026 A CN102658026 A CN 102658026A
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China
Prior art keywords
coke
living beings
biomass
injection
denitrating system
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CN2012101734709A
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Chinese (zh)
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王学斌
谭厚章
张利孟
司纪朋
徐通模
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Xian Jiaotong University
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Xian Jiaotong University
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Priority to CN2012101734709A priority Critical patent/CN102658026A/en
Publication of CN102658026A publication Critical patent/CN102658026A/en
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Abstract

A denitration system capable of jetting biomass coke comprises an alkali-metal-doped biomass coke jetting device communicated with a hearth. The alkali-metal-doped biomass coke jetting device consists of a biomass coke bin and a coke jetting air duct, the coke jetting air duct is communicated with the biomass coke bin and is provide with an air supply outlet, a fan is mounted on a coke jetting air duct positioned at the rear end of the biomass coke bin, and an outlet of the coke jetting air duct is provided with a biomass coke nozzle fixed onto a side wall of the heart. High NOx reduction efficiency is realized at high temperature owing to the biomass coke with high alkali metal content. The biomass coke is conveyed into the bin via a feed pipe, passes through the fan, then is jetted into a furnace at high speed via the biomass coke nozzle, and is mixed with flue gas from a main combustion area, and NOx is efficiently removed by the biomass coke with a certain quantity of alkali metal.

Description

A kind of denitrating system that sprays biomass char
Technical field
The invention belongs to the energy-conserving and environment-protective field, relate to a kind of denitrating system, concrete a kind of denitrating system that sprays biomass char.
Background technology
NOx is mainly derived from the burning of coal-fired power station boiler and vehicle motor, and the NOx that is discharged in the atmosphere can not cause photochemical pollution, can also form acid rain with oxysulfide, and people, plant, building and water source etc. are caused serious pollution and infringement.Denitration technology commonly used at present comprises that mainly selective-catalytic-reduction denitrified (SCR), selective non-catalytic denitration (SNCR), low-NOx combustor, air classification, fuel staging reach technology such as combustion again.Wherein the denitration efficiency of SCR is high, but builds and the maintenance cost costliness, and other several kinds then are difficult to satisfy national existing environmental requirement, therefore need a kind of denitride technology of high-efficiency and economic badly.
Living beings are then extensively thought a kind of " CO 2Zero-emission " environmentally friendly regenerative resource, in recent years along with the aggravation of greenhouse effects, the research of living beings comprehensive utilization is also more and more caused people's attention.Early existing researching and proposing living beings as reburning fuel at high temperature sent into living beings before after-flame wind, behind the primary zone as reburning fuel and realized denitration in the stove through designing new combustion system; And research in recent years shows that coke also has higher removal efficiency to NOx; Especially the alkali metal content in the living beings is very high; The process of the STRENGTH ON COKE reducing NOx of alkali metal own just has catalysis and facilitation; Therefore be used for denitration like biomass coke, then can realize higher denitration efficiency alkali metal containing.
Summary of the invention
The object of the present invention is to provide a kind of NOx that can not only realize removing efficiently, can also reach through utilizing living beings to reduce discharging CO 2Purpose spray the denitrating system of biomass char.
For achieving the above object; The technical scheme that the present invention adopts is: comprise the alkali doped biomass coke injection apparatus that is connected with burner hearth; Described alkali doped biomass coke injection apparatus comprises living beings coke feed bin and the burnt air channel of the spray that has air outlet that is connected with living beings coke feed bin; On the burnt air channel of the spray that is positioned at biomass char carbon feed bin rear end, blower fan is installed, the outlet of spraying burnt air channel is equipped with the living beings coke spout that is fixed on the burner hearth sidewall.
The described burnt air valve of spray that on the air outlet in the burnt air channel of spray, also is equipped with, wind pushing temperature is lower than 300 ℃.
In the described living beings coke feed bin feed bin stirring shaft is installed.
The upper end of described living beings coke feed bin is equipped with the feed pipe that has the feed valve.
Also be furnished with combustion exhausted wind apparatus on the burner hearth sidewall in described living beings coke spout downstream, this combustion exhausted wind apparatus comprises the living beings coke after-flame wind snout that is connected with living beings coke after-flame air channel that is installed on the burner hearth sidewall.
Characteristic matter coke after-flame air valve also is installed on the described living beings coke after-flame air channel.
The jet velocity of described living beings coke spout is 25-45m/s; Send into the ratio that heat that the biomass char burning in the burner hearth discharges accounts for all fuel input heats of combustion apparatus by living beings coke spout and be not higher than 5%, the time of staying between living beings coke spout to the living beings coke after-flame wind snout is not less than 0.15s.
The inlet jet velocity 30-45m/s of described living beings coke after-flame wind snout, temperature 250-330 ℃.
Described alkali doped biomass coke injection apparatus and combustion exhausted wind apparatus are arranged symmetrically in the burner hearth both sides.
Describedly spurt into alkali doped living beings coke average grain diameter in the burner hearth less than 200 μ m by living beings coke spout.
The present invention is applicable to combustion apparatus such as chain furnace, fluid bed and coal-powder boiler, realizes the reduction to NOx through spraying the living beings coke.
The invention has the advantages that: can be arranged on large-scale coal-powder boiler, fluid bed and other type industrial furnaces, easy for installation, applied range; Utilize biomass char carbon reduction NO under the high temperature xCatalytic alkali metal in the process has realized NO xEfficiently remove; Select the living beings coke as NO under high temperature and the rich fuel condition xReducing agent, simultaneously through self the burning discharge heat, improved combustion apparatus and NO xThe economy that removes; Living beings coke high velocity jet is gone in the stove, through strengthening NO in turbulence aggravation living beings coke and the upper reaches flue gas xMixing, improved NO xRemoval efficiency;
Description of drawings
Fig. 1 is an overall structure sketch map of the present invention.
Wherein, 1-living beings coke spout; The 2-blower fan; 3-sprays burnt air channel; 4-sprays burnt air valve; 5-living beings coke feed bin; 6-feed bin stirring shaft; 7-feed valve; The 8-feed pipe; 9-living beings coke after-flame air channel; 10-living beings coke after-flame air valve; 11-living beings coke after-flame wind snout
The specific embodiment
Below in conjunction with accompanying drawing the present invention is done further explain.
Referring to Fig. 1; The present invention includes the alkali doped biomass coke injection apparatus and the combustion exhausted wind apparatus that are arranged symmetrically in the burner hearth both sides; And combustion exhausted wind apparatus is positioned at the downstream of alkali doped biomass coke injection apparatus; Described alkali doped biomass coke injection apparatus comprises the burnt air channel 3 of the spray of living beings coke feed bin 5 and having of being connected with living beings coke feed bin 5 spraying burnt air valve 4; On the burnt air channel 3 of the spray that is positioned at biomass char carbon feed bin 5 rear ends, blower fan 2 is installed; The outlet of spraying burnt air channel 3 is equipped with the living beings coke spout 1 that is fixed on the burner hearth sidewall, in living beings coke feed bin 5, feed bin stirring shaft 6 is installed, and the upper end of living beings coke feed bin 5 is equipped with the feed pipe 8 that has feed valve 7;
Described combustion exhausted wind apparatus comprises the living beings coke after-flame wind snout 11 that is connected with living beings coke after-flame air channel 9 that is installed on the burner hearth sidewall, and characteristic matter coke after-flame air valve 10 also is installed on living beings coke after-flame air channel 9.
The temperature of spraying the hot-air before the burnt air valve 4 is no more than 300 ℃; Prevent the generation of spontaneous combustion, guaranteed the security of living beings coke powder feed system.
The living beings coke mixes back and NO with the flue gas of primary zone, the upper reaches or burning-out zone xThe temperature range of reaction is controlled at 800-1100 ℃, to prevent alkali metal aggravation coking in the biomass char carbon; Living beings coke high velocity jet is gone into the jet velocity 25-45m/s in the stove.At this conversion zone, corresponding living beings coke spout grate firing burns regional excess air factor less than 1, biomass char carbon reduction NO in the burnt air valve 4 adjusting stoves through spraying xBe reflected at and obtain under the catalytic alkali metal promoting.
The time of staying between living beings coke spout to the after-flame wind snout is not less than 0.15s, has guaranteed that coke has grace time and NO xNO has been guaranteed in reaction xRemoval efficiency; The inlet jet velocity 30-45m/s of after-flame wind snout 11, temperature 250-330 ℃.Through the to the greatest extent adding of wind of this grate firing, realize that not biomass-burning coke and other do not fire the after-flame of component, have made full use of NO xThe heat of reducing agent living beings coke, and improved the overall efficiency of combustion of combustion apparatus.
Send into the ratio that heat that the burnt burning of stove endogenous substance discharges accounts for all fuel input heats of combustion apparatus and be not higher than 5%.The living beings coke average grain diameter of spurting in the stove is controlled at below the 200 μ m, is beneficial to catching fire and after-flame of living beings coke.
The present invention sends into living beings coke feed bin 5 through feed pipe 8 through feed valve 7 with the living beings coke; Fall into the burnt air channel 3 of spray in the stirring of stirring shaft 6, and mixes through the hot-air that sprays burnt air valve 4 after air blast 2 backs are injected in the stove through living beings coke spout 1 high speed;
The air channel 9 and after-flame wind snout 11 that are used for living beings coke after-flame in living beings coke spout 1 arranged downstream are as the afterbody after-flame wind of whole combustion apparatus, through regulating living beings coke after-flame air valve 10 control after-flame air quantity, rationalization's burning.

Claims (10)

1. denitrating system that sprays biomass char; It is characterized in that: comprise the alkali doped biomass coke injection apparatus that is connected with burner hearth; Described alkali doped biomass coke injection apparatus comprises living beings coke feed bin (5) and the burnt air channel (3) of the spray that has air outlet that is connected with living beings coke feed bin (5); On the burnt air channel of the spray that is positioned at biomass char carbon feed bin (5) rear end (3), blower fan (2) is installed, the outlet of spraying burnt air channel (3) is equipped with the living beings coke spout (1) that is fixed on the burner hearth sidewall.
2. the denitrating system of injection biomass char according to claim 1 is characterized in that: the described spray burnt air valve (4) that on the air outlet in the burnt air channel of spray (3), also is equipped with, wind pushing temperature is lower than 300 ℃.
3. the denitrating system of injection biomass char according to claim 1 is characterized in that: feed bin stirring shaft (6) is installed in the described living beings coke feed bin (5).
4. the denitrating system of injection biomass char according to claim 1 is characterized in that: the upper end of described living beings coke feed bin (5) is equipped with the feed pipe (8) that has feed valve (7).
5. the denitrating system of injection biomass char according to claim 1; It is characterized in that: also be furnished with combustion exhausted wind apparatus on the burner hearth sidewall in described living beings coke spout (1) downstream, this combustion exhausted wind apparatus comprises the living beings coke after-flame wind snout (11) that is connected with living beings coke after-flame air channel (9) that is installed on the burner hearth sidewall.
6. the denitrating system of injection biomass char according to claim 5 is characterized in that: characteristic matter coke after-flame air valve (10) also is installed on the described living beings coke after-flame air channel (9).
7. the denitrating system of injection biomass char according to claim 5 is characterized in that: the jet velocity of described living beings coke spout is 25-45m/s; Send into the ratio that heat that the biomass char burning in the burner hearth discharges accounts for all fuel input heats of combustion apparatus by living beings coke spout and be not higher than 5%, the time of staying between living beings coke spout to the living beings coke after-flame wind snout is not less than 0.15s.
8. the denitrating system of injection biomass char according to claim 5 is characterized in that: the inlet jet velocity 30-45m/s of described living beings coke after-flame wind snout (11), temperature 250-330 ℃.
9. the denitrating system of injection biomass char according to claim 1 is characterized in that: described alkali doped biomass coke injection apparatus and combustion exhausted wind apparatus are arranged symmetrically in the burner hearth both sides.
10. the denitrating system of injection biomass char according to claim 1 is characterized in that: describedly spurt into alkali doped living beings coke average grain diameter in the burner hearth less than 200 μ m by living beings coke spout (1).
CN2012101734709A 2012-05-30 2012-05-30 Denitration system capable of jetting biomass coke Pending CN102658026A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103877856A (en) * 2014-03-27 2014-06-25 中冶焦耐工程技术有限公司 Coke oven flue gas waste heat utilization and purification method
CN104174265A (en) * 2014-08-12 2014-12-03 凌庭生 Method for reducing NOx in high-temperature calcination by SCR denitration technology adopting carbon-series reduction agent.
CN104807000A (en) * 2015-05-06 2015-07-29 烟台龙源电力技术股份有限公司 Biomass fuel re-burning system, biomass fuel re-burning method and boiler
CN106268279A (en) * 2016-08-29 2017-01-04 北京工业大学 A kind of method of denitration of dry-process cement rotary kiln flue gas
CN106732511A (en) * 2017-01-23 2017-05-31 中国环境科学研究院 A kind of biomass carbon denitrating catalyst and its preparation method and application
CN108679596A (en) * 2018-07-24 2018-10-19 宁波国电龙高科环境工程技术有限公司 A kind of PNCR boiler smokes abatement equipment
CN109603505A (en) * 2019-01-25 2019-04-12 广东万引科技发展有限公司 A kind of method of denitration of the dry-process cement rotary kiln flue gas with biomass bamboo charcoal

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101281698A (en) * 2008-06-03 2008-10-08 浙江融智能源科技有限公司 Simulation platform and test method for flow field arrangement structure of flue gas denitration apparatus
CN102302893A (en) * 2011-06-20 2012-01-04 中国华能集团清洁能源技术研究院有限公司 Selective non-catalytic reduction and denitration method for circulating fluidized bed boiler
CN102364246A (en) * 2011-04-25 2012-02-29 南京师范大学 Method and system for collectively removing NOx and mercury (Hg) in coal-fired flue gas by utilizing secondary combustion of biomass charcoal

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101281698A (en) * 2008-06-03 2008-10-08 浙江融智能源科技有限公司 Simulation platform and test method for flow field arrangement structure of flue gas denitration apparatus
CN102364246A (en) * 2011-04-25 2012-02-29 南京师范大学 Method and system for collectively removing NOx and mercury (Hg) in coal-fired flue gas by utilizing secondary combustion of biomass charcoal
CN102302893A (en) * 2011-06-20 2012-01-04 中国华能集团清洁能源技术研究院有限公司 Selective non-catalytic reduction and denitration method for circulating fluidized bed boiler

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103877856A (en) * 2014-03-27 2014-06-25 中冶焦耐工程技术有限公司 Coke oven flue gas waste heat utilization and purification method
CN103877856B (en) * 2014-03-27 2016-01-06 中冶焦耐工程技术有限公司 A kind of method of coke oven flue waste gas heat utilization and purification
CN104174265A (en) * 2014-08-12 2014-12-03 凌庭生 Method for reducing NOx in high-temperature calcination by SCR denitration technology adopting carbon-series reduction agent.
CN104807000A (en) * 2015-05-06 2015-07-29 烟台龙源电力技术股份有限公司 Biomass fuel re-burning system, biomass fuel re-burning method and boiler
CN106268279A (en) * 2016-08-29 2017-01-04 北京工业大学 A kind of method of denitration of dry-process cement rotary kiln flue gas
CN106732511A (en) * 2017-01-23 2017-05-31 中国环境科学研究院 A kind of biomass carbon denitrating catalyst and its preparation method and application
CN108679596A (en) * 2018-07-24 2018-10-19 宁波国电龙高科环境工程技术有限公司 A kind of PNCR boiler smokes abatement equipment
CN108679596B (en) * 2018-07-24 2024-03-08 宁波国电龙高科环境工程技术有限公司 PNCR boiler flue gas treatment equipment
CN109603505A (en) * 2019-01-25 2019-04-12 广东万引科技发展有限公司 A kind of method of denitration of the dry-process cement rotary kiln flue gas with biomass bamboo charcoal

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Application publication date: 20120912