CN105351961A - Coal combustion method for improving capture efficiency of carbon dioxide - Google Patents
Coal combustion method for improving capture efficiency of carbon dioxide Download PDFInfo
- Publication number
- CN105351961A CN105351961A CN201510755362.6A CN201510755362A CN105351961A CN 105351961 A CN105351961 A CN 105351961A CN 201510755362 A CN201510755362 A CN 201510755362A CN 105351961 A CN105351961 A CN 105351961A
- Authority
- CN
- China
- Prior art keywords
- combustion
- air
- steam
- oxygen
- carbon dioxide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
Abstract
The invention discloses a coal 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, purification and condensation compression, and heat generated by recovery is used for heating condensate water separated out after condensation compression and converting the condensate water into 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; 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; and S3, the generated smoke is processed into a liquid state through a compression system, and CO2 and the condensate water in the smoke are separated and recycled. 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 coal combustion 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 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 coal combustion method improving carbon dioxide capture 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:
Improve a coal combustion method for carbon dioxide capture efficiency, comprise the following steps:
S1, the high-temperature flue gas produced boiler combustion carry out waste heat recovery, purification, condensation compression, isolated condensed water after condensation compression, with the water vapour reclaiming the heat that generates and condensed water heating to be converted to 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, when steam required in described step S2 is not enough, converts steam to the waste-heat medium water reclaimed and supply.
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 NOx and SO in flue gas
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 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
Improve a coal combustion method for carbon dioxide capture efficiency, shown in composition graphs 1, comprise the following steps:
S1, the high-temperature flue gas produced boiler combustion carry out waste heat recovery, purification, condensation compression, isolated condensed water after condensation compression, with the water vapour reclaiming the heat that generates and condensed water heating to be converted to 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 1:30, 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.
Further, when steam required in described step S2 is not enough, converts steam to the waste-heat medium water reclaimed and supply; 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 coal combustion method for carbon dioxide capture efficiency, shown in composition graphs 1, comprise the following steps:
S1, the high-temperature flue gas produced boiler combustion carry out waste heat recovery, purification, condensation compression, isolated condensed water after condensation compression, with the water vapour reclaiming the heat that generates and condensed water heating to be converted to 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 1:60, 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.
Further, when steam required in described step S2 is not enough, converts steam to the waste-heat medium water reclaimed and supply; 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 coal combustion method for carbon dioxide capture efficiency, shown in composition graphs 1, comprise the following steps:
S1, the high-temperature flue gas produced boiler combustion carry out waste heat recovery, purification, condensation compression, isolated condensed water after condensation compression, with the water vapour reclaiming the heat that generates and condensed water heating to be converted to 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 1:40, 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.
Further, when steam required in described step S2 is not enough, converts steam to the waste-heat medium water reclaimed and supply; 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
2concentration be 90.0 ~ 90.5%.
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 (4)
1. improve a coal combustion method for carbon dioxide capture efficiency, it is characterized in that comprising the following steps:
S1, the high-temperature flue gas produced boiler combustion carry out waste heat recovery, purification, condensation compression, isolated condensed water after condensation compression, with the water vapour reclaiming the heat that generates and condensed water heating to be converted to 210 ~ 230 DEG C;
S2, by wherein a part of steam and First air send into the burner hearth of boiler, the volume ratio of steam and First air is 1 ~ 2:60, First air by the air blasted and circulating flue gas by making coal dust burn in burning first flame district and with eddy flow, coal dust being 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 coal combustion 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 coal combustion 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 recirculated water vapor applications according to claim 1 is in the technique of coal combustion boiler, it is characterized in that:
When steam required in described step S2 is not enough, converts steam to the waste-heat medium water reclaimed and supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510755362.6A CN105351961A (en) | 2015-11-09 | 2015-11-09 | Coal combustion method for improving capture efficiency of carbon dioxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510755362.6A CN105351961A (en) | 2015-11-09 | 2015-11-09 | Coal combustion method for improving capture efficiency of carbon dioxide |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105351961A true CN105351961A (en) | 2016-02-24 |
Family
ID=55327982
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510755362.6A Pending CN105351961A (en) | 2015-11-09 | 2015-11-09 | Coal combustion method for improving capture efficiency of carbon dioxide |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105351961A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107238092A (en) * | 2017-06-12 | 2017-10-10 | 清华大学 | The method and apparatus of coal-burning boiler smoke evacuation ultralow temperature condensing units and air intake humidification |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0926434A1 (en) * | 1997-12-24 | 1999-06-30 | Entreprise Generale De Chauffage Industriel Pillard | Burner with low nitrogen oxide emission using recycled gas feed |
| 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 |
| 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 |
-
2015
- 2015-11-09 CN CN201510755362.6A patent/CN105351961A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0926434A1 (en) * | 1997-12-24 | 1999-06-30 | Entreprise Generale De Chauffage Industriel Pillard | Burner with low nitrogen oxide emission using recycled gas feed |
| 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 |
| 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 |
Non-Patent Citations (1)
| Title |
|---|
| 吴占松等: "《煤炭清洁有效利用技术》", 31 July 2007 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107238092A (en) * | 2017-06-12 | 2017-10-10 | 清华大学 | The method and apparatus of coal-burning boiler smoke evacuation ultralow temperature condensing units and air intake humidification |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103062745B (en) | Water vapor circularly adjusting type oxygen-enriched combustion method for pulverized coal boiler | |
| DK3064841T3 (en) | COMBINED GAS STEAM CYCLE CENTRAL HEATER | |
| CN103234198B (en) | Microfine coal oxygen-enriched burning process and system | |
| CN101634449A (en) | Method for reducing emission of carbon dioxide by circulating fluidized bed temperature flue gas circulation oxygen combustion | |
| CN105257350B (en) | A kind of low calorific value coal steam-hot-air association circulating power generation system | |
| CN206768039U (en) | A kind of biomass gasifying furnace of cogeneration of heat and power | |
| CN108729965A (en) | The electricity generation system and CO of the part oxygen-enriched combusting of Combined with Calcium base chain2Capture method | |
| CN105222123A (en) | A kind of high-temperature oxygen-enriched formula overheat steam injection boiler | |
| CN105371295A (en) | Method for utilizing water vapor for improving efficiency of capturing carbon dioxide in flue gas | |
| CN104564345A (en) | Carbon dioxide zero-emission system of gas turbine | |
| CN105509038A (en) | Bubbling fluidized bed type O2/H20 pressurized oxygen-enriched combustion system | |
| CN103939158B (en) | A kind of low-order coal purification power generation system | |
| CN101413674A (en) | Oxygen-enriched air mixed blowing combustion adjuvant boiler energy-saving method and employed equipment thereof | |
| CN105344200A (en) | Technology for raising capture efficiency of carbon dioxide in flue gas by utilization of water vapor | |
| WO2023226473A1 (en) | Cooperative utilization system for coal gangue power generation and co2 mineralization and working method | |
| CN202522109U (en) | Waste heat recovery device for tail gas in flues of heat-pipe type boiler and kiln | |
| CN102221198B (en) | Low NOx combustion method for cyclone furnace and liquid state slagging and afterheat recycling system for cyclone furnace | |
| Hosseini | Fossil fuel crisis and global warming | |
| CN105351961A (en) | Coal combustion method for improving capture efficiency of carbon dioxide | |
| CN105299678A (en) | Method of applying circulating water vapor to coal combustion boiler | |
| CN105351959A (en) | Process for applying circulating water vapor to coal combustion boiler | |
| CN105299683A (en) | Coal combustion process for improving carbon dioxide capturing efficiency | |
| CN105351918A (en) | Lean oxygen combustion process for improving capture efficiency of carbon dioxide | |
| CN102322758A (en) | Heat-pipe type boiler/furnace/kiln flue-gas waste-heat recovery device | |
| CN203098053U (en) | Chemical hydrogen-rich gas collecting and utilizing system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160224 |