CN102588996A - Oxygen-enriched combustion system - Google Patents
Oxygen-enriched combustion system Download PDFInfo
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- CN102588996A CN102588996A CN2012100587651A CN201210058765A CN102588996A CN 102588996 A CN102588996 A CN 102588996A CN 2012100587651 A CN2012100587651 A CN 2012100587651A CN 201210058765 A CN201210058765 A CN 201210058765A CN 102588996 A CN102588996 A CN 102588996A
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- oxygen
- secondary air
- air duct
- enriched combusting
- burner
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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
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The invention discloses an oxygen-enriched combustion system, which comprises a boiler body, a turbulent burner, a primary air circulating system, a secondary air circulating system and an oxygen supply system, wherein the boiler body comprises a smoke extraction pipeline; the turbulent burner comprises a primary air flue and a secondary air flue and is arranged on the boiler body; the primary air circulating system is connected with the smoke extraction pipeline and the primary air flue of the turbulent burner; the secondary air circulating system is connected with the smoke extraction pipeline and the secondary air flue of the turbulent burner; and the oxygen supply system is connected with the secondary air flue and inputs oxygen. The oxygen-enriched combustion system adopts recirculated smoke to dry and transport pulverized coal, so that the temperature of the primary air of the outlet of a coal mill can be greatly increased, and the highest temperature is about 200 DEG C. High-concentration oxygen in secondary air smoke can be quickly mixed with primary air/ pulverized coal airflow, so the pulverized coal is sprayed in a boiler for rapid ignition and combustion. The combustion efficiency is greatly increased. The concentration of CO2 of smoke discharged by the boiler is more than 80 %, and CO2 is conveniently caught.
Description
Technical field
The present invention relates to a kind of coal burning boiler of power station technology, particularly a kind of oxygen-enriched combusting system that is applicable to vortex burner.
Background technology
Along with human industrial expansion, the climate change problem has become the problem that the whole world is paid close attention to, though to the reason of climate warming, also have different arguements at present, theory is thought itself and the greenhouse gases CO of mankind's activity generation mostly
2Concentration raises relevant.
Fossil fuel remains the chief component of world energy sources in longer a period of time from now on; And be that the power station industry of raw material is occupied critical role with the fossil fuel in fossil fuel uses; Also become simultaneously the CO2 emission source of relatively concentrating, discharge capacity is huge.So control and processing to the thermal power plant CO2 emission are very crucial.
At present, oxygen-enriched combustion technology is as a kind of important CO
2Capturing technology has obtained increasing concern.It promptly can be used for the technological transformation of existing boiler, also can be applicable to new steam generator system design.In oxygen-enriched combustion technology, pure oxygen and part flue gas recycled are mixed into the burner hearth burning, can make CO in the flue gas
2Concentration reaches more than 80%, is beneficial to CO greatly
2Seizure.Approaching during for the temperature that makes oxygen-enriched combustion boiler and air burning, need control flue gas recycled amount, make the O that gets into burner hearth
2Concentration maintains certain value.Big quantity research shows this O
2Concentration value is greatly between 20～40%.
Comprise primary air system and secondary air system in the tradition vortex burner system; Direct-firing primary air system is: the air that primary air fan will meet uniform temperature is sent into coal pulverizer and is used for drying and pulverized coal conveying, meets the requirements of a wind/breeze airflow and sprays into the burner hearth burning through air channel of burner.Secondary air system is sent air into air preheater by pressure fan and is heated to uniform temperature and sends into the burner secondary air box, in the secondary air duct of turbulent burner secondary air duct and/or outside secondary air duct spray into burner hearth, aftercombustion requisite oxygen amount.
Tradition swirl flow combustion mode adopts air as combustion oxidant, burning requisite oxygen amount is provided, because airborne N
2Content is higher, causes containing in the flue gas a large amount of N
2, cause CO
2Easily collecting not.Those skilled in the art is devoted to develop a kind of novel oxygen-enriched combustion technology that is applicable to vortex burner.
Summary of the invention
The technical problem that the present invention will solve is in order to overcome in the existing coal burning boiler of power station technology CO
2The deficiency of easily collecting not provides a kind of novel rich oxygen-enriched combusting system.
The present invention solves above-mentioned technical problem through following technical proposals:
A kind of oxygen-enriched combusting system, its characteristics are that said system comprises:
One boiler body comprises a smoke evacuation pipeline;
One turbulent burner comprises air channel and secondary air duct, is arranged on the said boiler body;
An air circulating system connects an air channel of said smoke evacuation pipeline and said turbulent burner;
The secondary wind circulatory system connects the secondary air duct of said smoke evacuation pipeline and said turbulent burner;
One oxygen system is connected with said secondary air duct and imports oxygen.
Preferably, said oxygen system comprises an air-separating plant, isolated oxygen input secondary air duct.
Preferably, the oxygen volume flow of said oxygen system input accounts for and gets into 20%～40% of the total volumetric flow of gas of burner hearth.
Preferably, a said air circulating system comprises a coal pulverizer, and the coal dust of its generation is imported said burner hearth with the flue gas recycled in an air channel.
Preferably, a said air circulating system and the secondary wind circulatory system are all through a flue gas heat exchange device and a recirculation blower.
Preferably, a said air circulating system comprises a dehydration branch road, and said dehydration branch road is provided with a dewater unit.
Preferably, said turbulent burner secondary air duct comprises outer secondary air duct and interior secondary air duct.
Preferably, said outer secondary air duct is provided with a cyclone.
Preferably, said interior secondary air duct is provided with a cyclone.
Preferably, said outer secondary air duct and interior secondary air duct respectively are provided with a cyclone.
Among the present invention, but above-mentioned optimum condition combination in any on the basis that meets this area general knowledge promptly gets each preferred embodiment of the present invention.
Positive progressive effect of the present invention is:
Elegance with flue gas recycled dry with transport, avoided in the prior art problem of coal dust detonation under the oxygen enrichment state, a wind-warm syndrome degree of coal pulverizer outlet can improve greatly, is up to about 200 ℃;
2. adopt part flue gas recycled drying and pulverized coal conveying, adopt pure oxygen to provide burning required oxidant, the CO2 concentration of boiler emission flue gas is reached more than 80%, be convenient to realize the seizure of CO2.
Description of drawings
Fig. 1 is the structural representation of the oxygen-enriched combusting system under one embodiment of the present of invention.
Fig. 2 is the vortex burner structural representation under one embodiment of the present of invention.
Fig. 3 is the vortex burner structural representation under second embodiment of the present invention.
Fig. 4 is the vortex burner structural representation under the 3rd embodiment of the present invention.
The specific embodiment
Embodiments of the invention will describe with reference to accompanying drawing.In Figure of description, element or device with similar structures or function will be used the components identical symbolic representation.Accompanying drawing is not to carry out the explanation of exhaustive to the present invention just for the ease of each embodiment of the present invention is described, neither limit scope of the present invention.
Fig. 1 shows the structural representation of the oxygen-enriched combusting system under one embodiment of the present of invention.In this embodiment, the oxygen-enriched combusting system comprises: boiler body 1, turbulent burner 2 is set on the boiler body 1, and turbulent burner 2 comprises air channel and secondary air duct.Flue gas heat exchange device 3 and deduster 4 are set in the smoke evacuation pipeline of boiler body 1, and deduster 4 backs connect air-introduced machine 5, chimney 6 and CO
2Purifying processing device 7 (CPU).
The flue gas recirculation loop is set behind the deduster 4, and this loop is provided with recirculation blower 8, and closed circuit is through being divided into the air circulating system and the secondary wind circulatory system behind the recirculation blower 8, and the air circulating system and the secondary wind circulatory system are all through flue gas heat exchange device 3.Recirculation blower 8 can also directly communicate with air through stop valve 81, and like this, when the flue gas recirculation loop was stopped using, recirculation blower 8 can be with the direct drawing-in system of air.
One time air circulating system is provided with a booster fan 10 and a dehydration branch road before flue gas heat exchange device 3, and dehydration is provided with dewater unit 9 in the branch road.Former moisture content of coal is higher than at 5% o'clock; Need to remove flue gas moisture from a wind and smoke gas of recirculation blower 8 through this dewater unit 9; Get into 3 heating of flue gas heat exchange device by booster fan 10 rear sections again; And mix with the flue gases that another part does not heat in flue gas heat exchange device 3 back, through the two-part flue gas ratio of valve regulated, be used to regulate the flue-gas temperature of entering coal pulverizer 11.One time air circulating system is provided with coal pulverizer 11 behind flue gas heat exchange device 3, and coal pulverizer 11 is connected with a feeder 13, and an air circulating system connects an air channel of turbulent burner 2 at last.
The secondary wind circulatory system is being connected with the secondary air duct of turbulent burner 2 through flue gas heat exchange device 3 backs, and the flue gas of the secondary wind circulatory system is imported burner hearth in secondary air duct with after the oxygen mix.
Fig. 2 shows the vortex burner structural representation under one embodiment of the present of invention.In this embodiment, turbulent burner 2 comprises: an air channel 14, interior secondary air duct 15, outer secondary air duct 16, burner secondary air box 17.Wherein an air channel 14 can be adopted the spiral case air intake or arranged that cyclone produces a wind and rotates into burner hearth, also can adopt wind of direct current to spray into burner hearth.In the present embodiment, interior secondary wind is the direct current form, does not arrange swirl vane.Arrange cyclone 21 in the outer secondary road, secondary wind is produced spray in the stove after the rotation combustion-supporting.
During boiler operatiopn, the flue gas of generation gets into deduster 4 through flue gas heat exchange device 3 backs, and the flue gas of discharging from deduster 4 is divided into two parts, and one tunnel process air-introduced machine, 5 backs enter atmosphere from chimney 6, or pass through CO
2Purifying processing device 7 is handled; Another road flue gas gets into the flue gas recirculation loop after being boosted by recirculation blower 8; The flue gas recirculation loop is divided into the air circulating system and the secondary wind circulatory system; One time air circulating system provides once air-dry dry powder feeding required exhaust gas volumn, and the secondary wind circulatory system provides secondary wind-heat flue gas and oxygen mix to get into the burner secondary air box.The equipment that air-separating plant 12 is known for industry, air are by inlet 121 accesss to plant, and with airborne nitrogen and oxygen separation, wherein nitrogen is discharged from nitrogen outlet 122, and pure oxygen transfers to turbulent burner 2 from oxygen outlet 123.
In the air circulating system, when former moisture content of coal was high, the flue gas that once air-dry dry powder feeding is provided was behind process recirculation blower 8; Need to remove flue gas moisture through moisture removal device 9; Again by wind booster fan 10 increase handle after, a part is through 3 heating of flue gas heat exchange device, and is mixed to about 200-500 ℃ with flue gas that another part does not heat and gets into coal pulverizer; By feeder 13 raw coal is delivered to coal pulverizer 11, be delivered to air channel of burner through above-mentioned hot flue gas drying and with the coal dust that grinds.Moisture removal device 9 is equipped with bypass duct, and during low or air burning, flue gas recycled gets into 3 preheatings of flue gas heat exchange device through bypass duct when former moisture content of coal.
In the secondary wind circulatory system; The pure oxygen that is provided by air-separating plant 12 gets into from secondary air duct oxygen intake 172; Mix the back with the flue gas that gets into from secondary air duct smoke inlet 171 and get into the burner secondary air box; And in the burner secondary air duct secondary air duct and/or outside secondary air duct get into burner hearth, coal dust firing requisite oxygen amount is provided.Said secondary wind-heat flue gas is provided by recirculation blower 8, and is heated to 200-500 ℃ through flue gas heat exchange device 3.Above-mentioned total oxygen volume flow accounts for the wind getting into burner hearth and the 20-40% of secondary wind total volumetric flow rate.
Mist mixed combustion in burner hearth of wind and smoke gas and coal dust intermixture, oxygen and secondary wind-heat flue gas and pure oxygen produces new flue gas and discharges from furnace outlet, behind tail flue gas heat exchanger 3, sends into deduster 4, thereby goes round and begins again operation.
Fig. 3 is the vortex burner structural representation under second embodiment of the present invention.In this embodiment, the interior secondary air duct 15 of turbulent burner 2 contains cyclone 21, makes mixture generation rotation after through secondary air duct in the burner of secondary wind-heat flue gas and pure oxygen spray into burner hearth.In the outer secondary air duct of burner, do not have cyclone, the mixture of secondary wind-heat flue gas and pure oxygen does not produce eddy flow behind the secondary air duct outside burner, and direct current sprays into burner hearth.
Fig. 4 is the vortex burner structural representation under the 3rd embodiment of the present invention.In this embodiment, all contain cyclone 21 in the inside and outside secondary air duct of turbulent burner 2, the mixture that makes secondary wind-heat flue gas and pure oxygen all produces rotation after through secondary air duct inside and outside the burner and sprays into burner hearth.
Though more than described the specific embodiment of the present invention, it will be understood by those of skill in the art that these only illustrate, protection scope of the present invention is limited appended claims.Those skilled in the art can make numerous variations or modification to these embodiments under the prerequisite that does not deviate from principle of the present invention and essence, but these changes and modification all fall into protection scope of the present invention.
Claims (10)
1. an oxygen-enriched combusting system is characterized in that, said system comprises:
One boiler body comprises a smoke evacuation pipeline;
One turbulent burner comprises air channel and secondary air duct, is arranged on the said boiler body;
An air circulating system connects an air channel of said smoke evacuation pipeline and said turbulent burner;
The secondary wind circulatory system connects the secondary air duct of said smoke evacuation pipeline and said turbulent burner;
One oxygen system is connected with said secondary air duct and imports oxygen.
2. oxygen-enriched combusting as claimed in claim 1 system, it is characterized in that: said oxygen system comprises an air-separating plant, isolated oxygen input secondary air duct.
3. oxygen-enriched combusting as claimed in claim 1 system is characterized in that: the oxygen volume flow of said oxygen system input accounts for and gets into 20%～40% of the total volumetric flow of gas of burner hearth.
4. oxygen-enriched combusting as claimed in claim 1 system, it is characterized in that: a said air circulating system comprises a coal pulverizer, and the coal dust of its generation is imported said burner hearth with the flue gas recycled in an air channel.
5. oxygen-enriched combusting as claimed in claim 1 system, it is characterized in that: a said air circulating system and the secondary wind circulatory system are all through a flue gas heat exchange device and a recirculation blower.
6. oxygen-enriched combusting as claimed in claim 1 system, it is characterized in that: a said air circulating system comprises a dehydration branch road, and said dehydration branch road is provided with a dewater unit.
7. like each described oxygen-enriched combusting system of claim 1 to 6, it is characterized in that: said turbulent burner secondary air duct comprises outer secondary air duct and interior secondary air duct.
8. oxygen-enriched combusting as claimed in claim 7 system, it is characterized in that: said outer secondary air duct is provided with a cyclone.
9. oxygen-enriched combusting as claimed in claim 7 system is characterized in that: secondary air duct is provided with a cyclone in said.
10. oxygen-enriched combusting as claimed in claim 7 system, it is characterized in that: said outer secondary air duct and interior secondary air duct respectively are provided with a cyclone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210058765.1A CN102588996B (en) | 2012-03-07 | 2012-03-07 | Oxygen-enriched combustion system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210058765.1A CN102588996B (en) | 2012-03-07 | 2012-03-07 | Oxygen-enriched combustion system |
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| CN102588996A true CN102588996A (en) | 2012-07-18 |
| CN102588996B CN102588996B (en) | 2015-02-18 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106594711A (en) * | 2016-12-28 | 2017-04-26 | 浙江宜清环境技术有限公司 | Low-nitrogen combustion device for chain furnace |
| CN109724070A (en) * | 2019-02-21 | 2019-05-07 | 华中科技大学 | A pressurized oxygen-enriched coal combustion system and method |
| CN112178633A (en) * | 2020-09-29 | 2021-01-05 | 湖北赤焰热能工程有限公司 | Concentrated double-air-regulation cyclone burner and method |
| CN112503514A (en) * | 2020-12-30 | 2021-03-16 | 郭汉荣 | Composite combustion circulating fluidized bed |
| CN116481293A (en) * | 2023-03-30 | 2023-07-25 | 国家能源集团科学技术研究院有限公司 | Boiler coal feeding quality-improving drying device and boiler coal feeding quality-improving system |
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| US20040001788A1 (en) * | 2002-02-15 | 2004-01-01 | Ovidiu Marin | Steam-generating combustion system and method for emission control using oxygen enhancement |
| CN2603295Y (en) * | 2003-02-28 | 2004-02-11 | 哈尔滨工业大学 | Central powder fed vortex coal powder burner |
| CN201170547Y (en) * | 2007-12-17 | 2008-12-24 | 泰安新城热电有限公司 | Oxygenation combustion-supporting device for fire coal electrification boiler of circulating fluid bed |
| CN101825278A (en) * | 2010-05-28 | 2010-09-08 | 华中科技大学 | Oxygen-rich combustor |
| JP2012021652A (en) * | 2010-07-12 | 2012-02-02 | Babcock Hitachi Kk | Combustion furnace for coal firing boiler and method of operating the same |
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2012
- 2012-03-07 CN CN201210058765.1A patent/CN102588996B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040001788A1 (en) * | 2002-02-15 | 2004-01-01 | Ovidiu Marin | Steam-generating combustion system and method for emission control using oxygen enhancement |
| CN2603295Y (en) * | 2003-02-28 | 2004-02-11 | 哈尔滨工业大学 | Central powder fed vortex coal powder burner |
| CN201170547Y (en) * | 2007-12-17 | 2008-12-24 | 泰安新城热电有限公司 | Oxygenation combustion-supporting device for fire coal electrification boiler of circulating fluid bed |
| CN101825278A (en) * | 2010-05-28 | 2010-09-08 | 华中科技大学 | Oxygen-rich combustor |
| JP2012021652A (en) * | 2010-07-12 | 2012-02-02 | Babcock Hitachi Kk | Combustion furnace for coal firing boiler and method of operating the same |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106594711A (en) * | 2016-12-28 | 2017-04-26 | 浙江宜清环境技术有限公司 | Low-nitrogen combustion device for chain furnace |
| CN109724070A (en) * | 2019-02-21 | 2019-05-07 | 华中科技大学 | A pressurized oxygen-enriched coal combustion system and method |
| CN112178633A (en) * | 2020-09-29 | 2021-01-05 | 湖北赤焰热能工程有限公司 | Concentrated double-air-regulation cyclone burner and method |
| CN112503514A (en) * | 2020-12-30 | 2021-03-16 | 郭汉荣 | Composite combustion circulating fluidized bed |
| CN116481293A (en) * | 2023-03-30 | 2023-07-25 | 国家能源集团科学技术研究院有限公司 | Boiler coal feeding quality-improving drying device and boiler coal feeding quality-improving system |
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| CN102588996B (en) | 2015-02-18 |
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