CN105351960A - Lean oxygen combustion method for improving capture efficiency of carbon dioxide - Google Patents
Lean oxygen combustion method for improving capture efficiency of carbon dioxide Download PDFInfo
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- CN105351960A CN105351960A CN201510755315.1A CN201510755315A CN105351960A CN 105351960 A CN105351960 A CN 105351960A CN 201510755315 A CN201510755315 A CN 201510755315A CN 105351960 A CN105351960 A CN 105351960A
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- combustion
- oxygen
- carbon dioxide
- capture efficiency
- burning
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/32—Direct CO2 mitigation
Abstract
The invention discloses a lean oxygen combustion method for improving capture efficiency of carbon dioxide. The method includes the following steps that S1, high-temperature smoke generated by boiler combustion is subjected to waste heat recovery, and heat generated by recovery is used for heating medium water to generate water vapor at the temperature of 210 DEG C-230 DEG C; S2, part of the water vapor and primary air are fed into a hearth of a boiler, pulverized coal is combusted in a first combustion flame region, and the pulverized coal is fed into a second flame region through rotational flow; and one part of the water vapor and secondary air are mixed and fed into the second flame region for pulverized coal combustion, and the pulverized coal is subjected to lean oxygen combustion in the second combustion flame region. It is avoided that NOx and SO2 in the smoke are continuously enriched along with increase of the number of cycles, and meanwhile the capture efficiency of CO2 is improved.
Description
Technical field
The present invention relates to boiler environmental technology field, particularly a kind of combustion with meagre oxygen method improving carbon dioxide capture efficiency.
Background technology
The pollutant of fuel combustion discharge is the major part of atmosphere pollution, and smoke components is CO mainly
2, a small amount of water vapour, a small amount of O
2, N
2and pollutant NO
xand SO
2.Along with the quick growth of energy demand and the sharply increase of fuel use amount, cause greenhouse gases CO
2continue to increase in natural cumulant, control fuel combustion process CO
2discharge, for reply greenhouse effects and global warming there is important effect.Particularly for China, in view of the feature of its energy resource structure based on coal, CO
2emission level sharply increases and has occupy the present situation of No. 1 in the world, develops efficient coal-fired CO
2emission-reduction technology, controls the coal-fired CO of China
2emission level, has great social effect and economic worth.
Fuel combustion techniques is divided into oxygen-enriched combustion technology and combustion with meagre oxygen technology, and combustion with meagre oxygen technology can suppress NO
xgeneration, and have certain energy-saving effect, the energy-saving principle of combustion with meagre oxygen is: recycle high-temperature flue gas, and high-temperature flue gas can maintain the high-temperature in burner hearth, thus the fuel quantity that needs are fed and air capacity are just reduced.
But, find after deliberation, directly utilize high-temperature flue gas to carry out circulation and still have a large amount of problem to exist: S1, circulation due to a large amount of flue gas, cause NO in flue gas
xand SO
2content can the continuous enrichment along with the increase of cycle-index, flue gas recirculation repeatedly simultaneously can increase air leakage phenomena, and makes N in flue gas
2content increases; CO in S2, reduction combustion with meagre oxygen flue gas
2concentration, and then increase the difficulty of subsequent compression purifying, reduce CO
2capture rate, be unfavorable for CO
2further exploitation; S3, a large amount of flue gas recirculations can cause boiler easily the phenomenons such as fouling to occur, and increase the weight of the burden of boiler attendance.
Summary of the invention
The invention provides a kind of combustion with meagre oxygen method improving carbon dioxide capture efficiency, at effective control NO
xgeneration while, can CO be improved
2capturing efficiency.
For achieving the above object, technical scheme of the present invention is:
Improve a combustion with meagre oxygen method for carbon dioxide capture efficiency, comprise the following steps:
S1, waste heat recovery is carried out to the high-temperature flue gas that boiler combustion produces, reclaim the heat that generates by the water vapour of medium water heating generation 210 ~ 230 DEG C;
S2, wherein a part of steam and First air are sent into the burner hearth of boiler, the volume ratio of steam and First air is 1 ~ 2:60, makes coal dust in the burning of burning first flame district and with eddy flow, coal dust is sent into the second flame district; Wherein a part of steam mixes with Secondary Air, and send into the second flame district of coal dust firing, the volume ratio of steam and Secondary Air is 1 ~ 2:40, makes coal dust form combustion with meagre oxygen in burning second flame district, at suppression NO
xwhile generating, improve the seizure effect of carbon dioxide in flue gas.
Further, described First air oxygen-supplying amount is 75 ~ 79% of fuel combustion oxygen demand; Described Secondary Air oxygen-supplying amount is 21 ~ 25% of fuel combustion oxygen demand.
Preferred, described First air oxygen-supplying amount is 78% of fuel combustion oxygen demand; Described Secondary Air oxygen-supplying amount is 22% of fuel combustion oxygen demand.
Further, described boiler furnace is in burning-out zone part and is provided with reducing agent spray gun, and reducing agent is sprayed into burning-out zone and reduces NO by reducing agent spray gun
xdischarge.
Further, described reducing agent is ammoniacal liquor or urea liquid.
The present invention has the following advantages:
(1) the heat heating medium water of high-temperature flue gas is utilized, by mixing of steam and First air and Secondary Air, regulate temperature and the boiler heat exchange state of burner hearth Flame, compared with traditional combustion with meagre oxygen mode, do not recycle the use of circulating flue gas, avoid NO in flue gas
xand SO
2content can the continuous enrichment along with the increase of cycle-index, improve CO simultaneously
2capture rate;
(2) strict control First air and Secondary Air send oxygen amount, effectively suppress thermal NO
xformed;
(3) avoid the repeatedly circulation of flue gas, alleviate the burden of boiler, there is the advantage of energy-conserving and environment-protective;
(4) CO in flue gas is conducive to
2recycling, cost-saving, achieve the development of recycling economy.
Accompanying drawing explanation
Fig. 1 is process flow diagram of the present invention.
Detailed description of the invention
Below in conjunction with specific embodiment, the invention will be further described, but protection scope of the present invention and range of application are not limited to following examples:
Embodiment 1
Improve a combustion with meagre oxygen method for carbon dioxide capture efficiency, shown in composition graphs 1, comprise the following steps:
S1, waste heat recovery is carried out to the high-temperature flue gas that boiler combustion produces, reclaim the heat that generates by the water vapour of medium water heating generation 210 ~ 220 DEG C;
S2, wherein a part of steam and First air are sent into the burner hearth of boiler, the volume ratio of steam and First air is 1:30, makes coal dust in the burning of burning first flame district and with eddy flow, coal dust is sent into the second flame district; Wherein a part of steam mixes with Secondary Air, and send into the second flame district of coal dust firing, the volume ratio of steam and Secondary Air is 1:20, makes coal dust form combustion with meagre oxygen in burning second flame district, at suppression NO
xwhile generating, improve the seizure effect of carbon dioxide in flue gas.
Wherein, First air oxygen-supplying amount is 79% of fuel combustion oxygen demand; Described Secondary Air oxygen-supplying amount is 21% of fuel combustion oxygen demand.
For reducing NO further
xdischarge, be in burning-out zone part at boiler furnace and be provided with reducing agent spray gun, reducing agent is sprayed into burning-out zone by reducing agent spray gun, and the reducing agent that spray gun sprays into is ammoniacal liquor or urea liquid.
Wherein, medium water is that water is put into heater, and the heat utilizing high-temperature flue gas to reclaim heats.
The high-temperature flue gas of hearth combustion, after heat exchange, purification, enters compressibility and is processed into liquid, carry out recycling CO
2, CO after purified treatment
2concentration be 91 ~ 92%.
Embodiment 2
Improve a combustion with meagre oxygen method for carbon dioxide capture efficiency, shown in composition graphs 1, comprise the following steps:
S1, waste heat recovery is carried out to the high-temperature flue gas that boiler combustion produces, reclaim the heat that generates by the water vapour of medium water heating generation 225 ~ 230 DEG C;
S2, wherein a part of steam and First air are sent into the burner hearth of boiler, the volume ratio of steam and First air is 1:60, makes coal dust in the burning of burning first flame district and with eddy flow, coal dust is sent into the second flame district; Wherein a part of steam mixes with Secondary Air, and send into the second flame district of coal dust firing, the volume ratio of steam and Secondary Air is 1:40, makes coal dust form combustion with meagre oxygen in burning second flame district, at suppression NO
xwhile generating, improve the seizure effect of carbon dioxide in flue gas.
Wherein, First air oxygen-supplying amount is 78% of fuel combustion oxygen demand; Described Secondary Air oxygen-supplying amount is 22% of fuel combustion oxygen demand.
For reducing NO further
xdischarge, be in burning-out zone part at boiler furnace and be provided with reducing agent spray gun, reducing agent is sprayed into burning-out zone by reducing agent spray gun, and the reducing agent that spray gun sprays into is ammoniacal liquor or urea liquid.
Wherein, medium water is that water is put into heater, and the heat utilizing high-temperature flue gas to reclaim heats.
The high-temperature flue gas of hearth combustion, after heat exchange, purification, enters compressibility and is processed into liquid, carry out recycling CO
2, CO after purified treatment
2concentration be 92 ~ 92.5%.
Embodiment 3
Improve a combustion with meagre oxygen method for carbon dioxide capture efficiency, shown in composition graphs 1, comprise the following steps:
S1, waste heat recovery is carried out to the high-temperature flue gas that boiler combustion produces, reclaim the heat that generates by the water vapour of medium water heating generation 220 ~ 225 DEG C;
S2, wherein a part of steam and First air are sent into the burner hearth of boiler, the volume ratio of steam and First air is 1:40, makes coal dust in the burning of burning first flame district and with eddy flow, coal dust is sent into the second flame district; Wherein a part of steam mixes with Secondary Air, and send into the second flame district of coal dust firing, the volume ratio of steam and Secondary Air is 1.5:40, makes coal dust form combustion with meagre oxygen in burning second flame district, at suppression NO
xwhile generating, improve the seizure effect of carbon dioxide in flue gas.
Wherein, First air oxygen-supplying amount is 75% of fuel combustion oxygen demand; Described Secondary Air oxygen-supplying amount is 25% of fuel combustion oxygen demand.
For reducing NO further
xdischarge, be in burning-out zone part at boiler furnace and be provided with reducing agent spray gun, reducing agent is sprayed into burning-out zone by reducing agent spray gun, and the reducing agent that spray gun sprays into is ammoniacal liquor or urea liquid.
Wherein, medium water is that water is put into heater, and the heat utilizing high-temperature flue gas to reclaim heats.
The high-temperature flue gas of hearth combustion, after heat exchange, purification, enters compressibility and is processed into liquid, carry out recycling CO
2, CO after purified treatment
2concentration be 89.5 ~ 90.2%.
Above content is in conjunction with concrete preferred embodiment further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention; make some equivalent alternative or obvious modification without departing from the inventive concept of the premise; and performance or purposes identical, all should be considered as belonging to the scope of patent protection that the present invention is determined by submitted to claims.
Claims (5)
1. improve a combustion with meagre oxygen method for carbon dioxide capture efficiency, it is characterized in that comprising the following steps:
S1, waste heat recovery is carried out to the high-temperature flue gas that boiler combustion produces, reclaim the heat that generates by the water vapour of medium water heating generation 210 ~ 230 DEG C;
S2, wherein a part of steam and First air are sent into the burner hearth of boiler, the volume ratio of steam and First air is 1 ~ 2:60, makes coal dust in the burning of burning first flame district and with eddy flow, coal dust is sent into the second flame district; Wherein a part of steam mixes with Secondary Air, and send into the second flame district of coal dust firing, the volume ratio of steam and Secondary Air is 1 ~ 2:40, makes coal dust form combustion with meagre oxygen in burning second flame district, at suppression NO
xwhile generating, improve the seizure effect of carbon dioxide in flue gas.
2. a kind of combustion with meagre oxygen method improving carbon dioxide capture efficiency according to claim 1, is characterized in that:
Described First air oxygen-supplying amount is 75 ~ 79% of fuel combustion oxygen demand; Described Secondary Air oxygen-supplying amount is 21 ~ 25% of fuel combustion oxygen demand.
3. a kind of combustion with meagre oxygen method improving carbon dioxide capture efficiency according to claim 2, is characterized in that:
Described First air oxygen-supplying amount is 78% of fuel combustion oxygen demand; Described Secondary Air oxygen-supplying amount is 22% of fuel combustion oxygen demand.
4. a kind of combustion with meagre oxygen method improving carbon dioxide capture efficiency according to claim 1, is characterized in that:
Described boiler furnace is in burning-out zone part and is provided with reducing agent spray gun, and reducing agent is sprayed into burning-out zone and reduces NO by reducing agent spray gun
xdischarge.
5. a kind of combustion with meagre oxygen method improving carbon dioxide capture efficiency according to claim 4, is characterized in that:
Described reducing agent is ammoniacal liquor or urea liquid.
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|---|---|---|---|---|
| EP0926434A1 (en) * | 1997-12-24 | 1999-06-30 | Entreprise Generale De Chauffage Industriel Pillard | Burner with low nitrogen oxide emission using recycled gas feed |
| CN103062745A (en) * | 2012-12-17 | 2013-04-24 | 华中科技大学 | Water vapor circularly adjusting type oxygen-enriched combustion method for pulverized coal boiler |
| CN103411209A (en) * | 2013-08-15 | 2013-11-27 | 陕西胜慧源信息科技有限公司 | Device and method for high-efficiency energy-saving combustion of low-heat value coal |
| CN103697490A (en) * | 2012-11-30 | 2014-04-02 | 郭志男 | Method for realizing combustion supporting through water vapor spraying by kiln |
| CN104147912A (en) * | 2014-07-10 | 2014-11-19 | 阿米那能源环保技术（中国）有限公司 | Flue-gas denitration method and device by mixing of selective non-catalytic reduction method SNCR and selective catalytic reduction method SCR |
| CN204100274U (en) * | 2014-09-28 | 2015-01-14 | 临沂市巨亚环保节能锅炉研究所 | A kind of reducing agent straight line injecting type denitration boiler |
| CN105003912A (en) * | 2015-07-24 | 2015-10-28 | 湖南高华环保股份有限公司 | Low-NOx combustion method and low-NOx combustion system |
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2015
- 2015-11-09 CN CN201510755315.1A patent/CN105351960A/en active Pending
Patent Citations (7)
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| EP0926434A1 (en) * | 1997-12-24 | 1999-06-30 | Entreprise Generale De Chauffage Industriel Pillard | Burner with low nitrogen oxide emission using recycled gas feed |
| CN103697490A (en) * | 2012-11-30 | 2014-04-02 | 郭志男 | Method for realizing combustion supporting through water vapor spraying by kiln |
| CN103062745A (en) * | 2012-12-17 | 2013-04-24 | 华中科技大学 | Water vapor circularly adjusting type oxygen-enriched combustion method for pulverized coal boiler |
| CN103411209A (en) * | 2013-08-15 | 2013-11-27 | 陕西胜慧源信息科技有限公司 | Device and method for high-efficiency energy-saving combustion of low-heat value coal |
| CN104147912A (en) * | 2014-07-10 | 2014-11-19 | 阿米那能源环保技术（中国）有限公司 | Flue-gas denitration method and device by mixing of selective non-catalytic reduction method SNCR and selective catalytic reduction method SCR |
| CN204100274U (en) * | 2014-09-28 | 2015-01-14 | 临沂市巨亚环保节能锅炉研究所 | A kind of reducing agent straight line injecting type denitration boiler |
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| C41 | Transfer of patent application or patent right or utility model | ||
| CB03 | Change of inventor or designer information |
Inventor after: Liang Jiefeng Inventor after: Yang Yun Inventor after: Li Jianhua Inventor before: Jiang Dong Inventor before: Huang Tian Inventor before: Liang Junzuo Inventor before: Liang Chenghan |
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| COR | Change of bibliographic data | ||
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Effective date of registration: 20160908 Address after: Starlake 530022 Nanning Road, the Guangxi Zhuang Autonomous Region No. 39 building 7 1 unit 3 floor No. 5 Applicant after: GUANGXI KUONENGBA ENERGY TECHNOLOGY DEVELOPMENT CO., LTD. Address before: Dong Ge road Nanning 530000 the Guangxi Zhuang Autonomous Region 24-8 building B unit B0606 real Kaifeng Applicant before: Guangxi Guisheng New Energy Science & Technology Co., Ltd. |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160224 |
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