CN105371295A - Method for utilizing water vapor for improving efficiency of capturing carbon dioxide in flue gas - Google Patents
Method for utilizing water vapor for improving efficiency of capturing carbon dioxide in flue gas Download PDFInfo
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- CN105371295A CN105371295A CN201510755317.0A CN201510755317A CN105371295A CN 105371295 A CN105371295 A CN 105371295A CN 201510755317 A CN201510755317 A CN 201510755317A CN 105371295 A CN105371295 A CN 105371295A
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- flue gas
- carbon dioxide
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- oxygen
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
- F23L7/002—Supplying water
- F23L7/005—Evaporated water; Steam
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
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Abstract
The invention discloses a method for utilizing water vapor for improving the efficiency of capturing carbon dioxide in flue gas. The method includes the following steps that S1, waste heat of high-temperature flue gas generated during burning of a boiler is recycled, and medium water is heated by heat generated by recycling to generate water vapor of 210 DEGC-230 DEG C; S2, a part of water vapor and primary air are fed into a hearth of the boiler, braize is burnt in a first burning flame area, rotational flow is generated to feed the braize to a second flame area, a part of water vapor and secondary air are mixed and fed into the second braize burning flame area, and the braize is subjected to oxygen deficient burning in the second flame area; and S3, a part of water vapor and tertiary air are mixed and fed into a third flame area where the whole braize burning process is completed. The situation that the content of NOx and SO2 in flue gas is increased along with increasing of the circulating frequency is avoided, and meanwhile the CO2 capturing efficiency is improved.
Description
Technical field
The present invention relates to boiler environmental technology field, particularly a kind of method steam being applied to raising carbon dioxide in flue gas capturing 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 NOx and 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, combustion with meagre oxygen technology can suppress the generation of NOx, and there is certain energy-saving effect, the energy-saving principle of combustion with meagre oxygen is: recycle high-temperature flue gas, 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 NOx and SO in flue gas
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 method steam being applied to raising carbon dioxide in flue gas capturing efficiency, while the generation of effective control NOx, can CO be improved
2capturing efficiency.
For achieving the above object, technical scheme of the present invention is:
Steam is applied to the method improving carbon dioxide in flue gas capturing efficiency, comprises 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, First air is sent into the burner hearth of boiler, make coal dust in the burning of burning first flame district and with eddy flow, coal dust 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 ~ 2:38, 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;
S3, general wherein a part of steam mix with tertiary air, and send into the 3rd flame district that coal dust completes whole burning, the volume ratio that steam mixes with tertiary air is 1 ~ 2:35, catches the 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 15 ~ 19% of fuel combustion oxygen demand; Described tertiary air oxygen-supplying amount is 2 ~ 6% 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 18% of fuel combustion oxygen demand; Described tertiary air oxygen-supplying amount is 4% of fuel combustion oxygen demand.
Further, described boiler furnace is in the 3rd flame district part and is provided with reducing agent spray gun, and reducing agent is sprayed into the 3rd flame district 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, Secondary Air and tertiary 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 NOx and SO in flue gas
2content can the continuous enrichment along with the increase of cycle-index, improve CO simultaneously
2capture rate;
(2) what strictly control First air, Secondary Air and tertiary air send oxygen amount, effectively suppresses thermal NO x to be formed;
(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
Steam is applied to the method improving carbon dioxide in flue gas capturing efficiency, shown in composition graphs 1, comprises 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, First air is sent into the burner hearth of boiler, make coal dust in the burning of burning first flame district and with eddy flow, coal dust 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 1:19, 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;
S3, general wherein a part of steam mix with tertiary air, and send into the 3rd flame district that coal dust completes whole burning, the volume ratio that steam mixes with tertiary air is 2:35, catches the 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 19% of fuel combustion oxygen demand; Described tertiary air oxygen-supplying amount is 6% of fuel combustion oxygen demand.
For reducing NO further
xdischarge, be in the 3rd flame district part at boiler furnace and be provided with reducing agent spray gun, reducing agent is sprayed into the 3rd flame district 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 90 ~ 91%.
Embodiment 2
Steam is applied to the method improving carbon dioxide in flue gas capturing efficiency, shown in composition graphs 1, comprises 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, First air is sent into the burner hearth of boiler, make coal dust in the burning of burning first flame district and with eddy flow, coal dust 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 1.5:38, 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;
S3, general wherein a part of steam mix with tertiary air, and send into the 3rd flame district that coal dust completes whole burning, the volume ratio that steam mixes with tertiary air is 1:35, catches the 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 18% of fuel combustion oxygen demand; Described tertiary air oxygen-supplying amount is 4% of fuel combustion oxygen demand.
For reducing NO further
xdischarge, be in the 3rd flame district part at boiler furnace and be provided with reducing agent spray gun, reducing agent is sprayed into the 3rd flame district 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 92.0 ~ 92.5%.
Embodiment 3
Steam is applied to the method improving carbon dioxide in flue gas capturing efficiency, shown in composition graphs 1, comprises 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, First air is sent into the burner hearth of boiler, make coal dust in the burning of burning first flame district and with eddy flow, coal dust 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 1:38, 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
S3, general wherein a part of steam mix with tertiary air, and send into the 3rd flame district that coal dust completes whole burning, the volume ratio that steam mixes with tertiary air is 1.5:35, catches the 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 15% of fuel combustion oxygen demand; Described tertiary air oxygen-supplying amount is 6% of fuel combustion oxygen demand.
For reducing NO further
xdischarge, be in the 3rd flame district part at boiler furnace and be provided with reducing agent spray gun, reducing agent is sprayed into the 3rd flame district 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 88 ~ 88.5%.
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. steam is applied to the method improving carbon dioxide in flue gas capturing 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, First air is sent into the burner hearth of boiler, make coal dust in the burning of burning first flame district and with eddy flow, coal dust 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 ~ 2:38, 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;
S3, general wherein a part of steam mix with tertiary air, and send into the 3rd flame district that coal dust completes whole burning, the volume ratio that steam mixes with tertiary air is 1 ~ 2:35, catches the carbon dioxide in flue gas.
2. a kind of method steam being applied to raising carbon dioxide in flue gas capturing 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 15 ~ 19% of fuel combustion oxygen demand; Described tertiary air oxygen-supplying amount is 2 ~ 6% of fuel combustion oxygen demand.
3. a kind of method steam being applied to raising carbon dioxide in flue gas capturing 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 18% of fuel combustion oxygen demand; Described tertiary air oxygen-supplying amount is 4% of fuel combustion oxygen demand.
4. a kind of method steam being applied to raising carbon dioxide in flue gas capturing efficiency according to claim 1, is characterized in that:
Described boiler furnace is in the 3rd flame district part and is provided with reducing agent spray gun, and reducing agent is sprayed into the 3rd flame district and reduces NO by reducing agent spray gun
xdischarge.
5. a kind of method steam being applied to raising carbon dioxide in flue gas capturing efficiency according to claim 4, is characterized in that:
Described reducing agent is ammoniacal liquor or urea liquid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510755317.0A CN105371295A (en) | 2015-11-09 | 2015-11-09 | Method for utilizing water vapor for improving efficiency of capturing carbon dioxide in flue gas |
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|---|---|---|---|
| CN201510755317.0A CN105371295A (en) | 2015-11-09 | 2015-11-09 | Method for utilizing water vapor for improving efficiency of capturing carbon dioxide in flue gas |
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|---|---|
| CN105371295A true CN105371295A (en) | 2016-03-02 |
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|---|---|---|---|
| CN201510755317.0A Pending CN105371295A (en) | 2015-11-09 | 2015-11-09 | Method for utilizing water vapor for improving efficiency of capturing carbon dioxide in flue gas |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106509966A (en) * | 2016-11-29 | 2017-03-22 | 黄俊柳 | Flue-cured tobacco stove utilizing water vapor combustion and secondary combustion |
| CN106582206A (en) * | 2016-12-19 | 2017-04-26 | 孟庆东 | Method for decreasing haze by reducing content of carbon dioxide |
| CN112212320A (en) * | 2020-10-27 | 2021-01-12 | 洛阳万基发电有限公司 | Automatic coal combustion device for thermal power plant |
Citations (3)
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|---|---|---|---|---|
| WO2007012143A1 (en) * | 2005-07-29 | 2007-02-01 | Commonwealth Scientific And Industrial Research Organisation | Recovery of carbon dioxide from flue gases |
| CN101865451A (en) * | 2010-05-24 | 2010-10-20 | 叶力平 | Biomass high-temperature flue gas gasification combination coal burning boiler and low-pollution combustion method thereof |
| 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 |
-
2015
- 2015-11-09 CN CN201510755317.0A patent/CN105371295A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007012143A1 (en) * | 2005-07-29 | 2007-02-01 | Commonwealth Scientific And Industrial Research Organisation | Recovery of carbon dioxide from flue gases |
| CN101865451A (en) * | 2010-05-24 | 2010-10-20 | 叶力平 | Biomass high-temperature flue gas gasification combination coal burning boiler and low-pollution combustion method thereof |
| 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 |
Non-Patent Citations (1)
| Title |
|---|
| 吴占松等: "《煤炭清洁有效利用技术》", 31 July 2007 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106509966A (en) * | 2016-11-29 | 2017-03-22 | 黄俊柳 | Flue-cured tobacco stove utilizing water vapor combustion and secondary combustion |
| CN106582206A (en) * | 2016-12-19 | 2017-04-26 | 孟庆东 | Method for decreasing haze by reducing content of carbon dioxide |
| CN112212320A (en) * | 2020-10-27 | 2021-01-12 | 洛阳万基发电有限公司 | Automatic coal combustion device for thermal power plant |
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| SE01 | Entry into force of request for substantive examination | ||
| 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 | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20160909 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: 20160302 |
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