CN102588997B - Oxygen enriched combustion system - Google Patents

Oxygen enriched combustion system Download PDF

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Publication number
CN102588997B
CN102588997B CN201210058768.5A CN201210058768A CN102588997B CN 102588997 B CN102588997 B CN 102588997B CN 201210058768 A CN201210058768 A CN 201210058768A CN 102588997 B CN102588997 B CN 102588997B
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oxygen
air
flue gas
air channel
enriched combustion
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CN102588997A (en
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李月华
张建文
肖琨
赵洋
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Shanghai Boiler Works Co Ltd
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Shanghai Boiler Works Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/32Direct CO2 mitigation
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/34Indirect 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 cyclone combustor, a primary air circulating system, a secondary air circulating system and an oxygen supply system. The boiler body consists of a smoke exhaust pipeline, the cyclone combustor comprises a primary air channel and a secondary air channel and is disposed on the boiler body, the smoke exhaust pipeline is connected with the primary air channel of the cyclone combustor by the primary air circulating system, the smoke exhaust pipeline is connected with the secondary air channel of the cyclone combustor by the secondary air circulating system, and the oxygen supply system is connected with the primary air channel and the secondary air channel and inputs oxygen. The temperature of primary air of an outlet of a coal mill can be greatly increased by means of drying recycled smoke and conveying pulverized coal, the highest temperature of the primary air can reach about 200 DEG C, the pure oxygen can be quickly injected into the high-temperature primary air/airflow of the pulverized coal and is sufficiently mixed with the high-temperature primary air/the air flow of the pulverized coal, and accordingly the pulverized coal is injected into a boiler and is quickly ignited and combusted; combustion efficiency is greatly improved; and concentration of CO2 of the smoke exhausted from the boiler reaches 80% at least, and the CO2 can be captured conveniently.

Description

Oxygen-enriched combustion system
Technical field
The present invention relates to a kind of coal burning boiler of power station technology, particularly a kind of oxygen-enriched combustion system that is applicable to vortex burner.
Background technology
Along with mankind's industrial expansion, climate change problem has become the problem that the whole world is paid close attention to, although the reason to climate warming also exists at present different arguements, 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 within longer a period of time from now on, and power station industry take fossil fuel as raw material is occupied critical role in fossil fuel uses, also become more concentrated CO2 emission source, discharge capacity is huge simultaneously.So control and processing for 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 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 hearth combustion, can make CO in flue gas 2concentration reaches more than 80%, is greatly beneficial to CO 2seizure.Approach when making the temperature of oxygen-enriched combustion boiler and air burning, need to control flue gas recycled amount, make to enter the O of burner hearth 2concentration maintains certain value.Large quantity research shows, this O 2concentration value is greatly between 20~40%.
Tradition vortex burner system comprises primary air system and secondary air system, direct-firing primary air system is: primary air fan is sent into coal pulverizer for dry and pulverized coal conveying by the air that meets uniform temperature, meets the requirements of a wind/breeze airflow and sprays into hearth combustion 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 burner secondary air box, sprays into burner hearth, aftercombustion requisite oxygen amount through secondary air duct inner second air road and/or the outer second air road of turbulent burner.
Tradition swirl flow combustion mode adopts air as combustion oxidant, provides burning requisite oxygen amount, due to airborne N 2content is higher, causes containing in flue gas a large amount of N 2, cause CO 2not easily collecting.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 to be solved in the present invention is in order to overcome in existing coal burning boiler of power station technology, CO 2the not deficiency of easily collecting, provides a kind of novel oxygen-enriched combustion system.
The present invention solves above-mentioned technical problem by following technical proposals:
A kind of oxygen-enriched combustion system, its feature is, described system comprises:
One boiler body, comprises a smoke-exhaust pipeline;
One turbulent burner, comprises air channel and secondary air duct, is arranged on described boiler body;
An air circulating system, connects an air channel of described smoke-exhaust pipeline and described turbulent burner;
The Secondary Air circulatory system, connects the secondary air duct of described smoke-exhaust pipeline and described turbulent burner;
One oxygen system, is connected with a described air channel and secondary air duct and inputs oxygen.
Preferably, a described air channel arranges an annular oxygen room apart from ducting outlet one preset distance place, and described oxygen room is evenly distributed on an oxygen spray pipe on air channel by one and communicates with an air channel.
Preferably, described oxygen system comprises an air-separating plant, and an isolated oxygen part is by an air channel of described oxygen spray pipe input, and another part is inputted secondary air duct.
Preferably, the oxygen volume flow of described oxygen system input accounts for and enters 20%~40% of the total volumetric flow of gas of burner hearth.
Preferably, a described air circulating system comprises a coal pulverizer, inputs described burner hearth together with the flue gas recycled in the coal dust of its generation and an air channel.
Preferably, a described air circulating system and the Secondary Air circulatory system are all through a flue gas heat-exchange unit and a recirculation blower.
Preferably, a described air circulating system comprises a dehydration branch road, and described dehydration branch road arranges a dewater unit.
Preferably, described turbulent burner secondary air duct comprises outer second air road and inner second air road.
Preferably, described outer second air road arranges a cyclone.
Preferably, described inner second air road arranges a cyclone.
Preferably, described outer second air road and inner second air road respectively arrange a cyclone.
In the present invention, above-mentioned optimum condition can be combined on the basis that meets this area general knowledge, obtains the each preferred embodiment of the present invention.
Positive progressive effect of the present invention is:
1. elegance is dry and transport with flue gas recycled, has avoided in prior art the problem of coal dust detonation under oxygen enrichment state, and an air temperature of coal pulverizer outlet can improve greatly, is up to 200 ℃ of left and right;
2. in an air channel, arrange oxygen spray pipe with a certain distance from spout, pure oxygen can be injected rapidly a wind/breeze airflow of high temperature and fully mix, and coal dust is sprayed in stove and catch fire rapidly and burn;
3. the overall oxygen concentration ratio that sprays into burner hearth is high in air, and the temperature of a high wind and high oxygen concentration impel breeze airflow to catch fire rapidly and after-flame, have greatly improved efficiency of combustion;
4. adopt part flue gas recycled to be dried and pulverized coal conveying, adopt pure oxygen that burning requisite oxygen agent is provided, the CO2 concentration of boiler emission flue gas is reached more than 80%, be convenient to realize the seizure of CO2.
Accompanying drawing explanation
Fig. 1 is the structural representation of the oxygen-enriched combustion 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 describe with reference to the accompanying drawings.In Figure of description, element or the device with similar structures or function will represent with identical component symbol.Just each embodiment of the present invention for convenience of explanation of accompanying drawing, is not to carry out to the present invention the explanation of exhaustive, neither limit scope of the present invention.
Fig. 1 shows the structural representation of the oxygen-enriched combustion system under one embodiment of the present of invention.In this embodiment, oxygen-enriched combustion system comprises: boiler body 1, and the turbulent burner 2 of arranging on boiler body 1, turbulent burner 2 comprises air channel and secondary air duct.Flue gas heat-exchange unit 3 and deduster 4 are set, the rear connection air-introduced machine 5 of deduster 4, chimney 6 and CO in the smoke-exhaust pipeline of boiler body 1 2purifying processing device 7 (CPU).
Flue gas recirculation loop is set after deduster 4, and this loop arranges recirculation blower 8, and closed circuit is divided into air circulating system and the Secondary Air circulatory system after recirculation blower 8, and air circulating system and the Secondary Air circulatory system are all by flue gas heat-exchange unit 3.Recirculation blower 8 can also directly communicate with air by stop valve 81, and like this, in the time that flue gas recirculation loop is stopped using, recirculation blower 8 can be by direct air drawing-in system.
One time air circulating system arranges booster fan 10 and a dehydration branch road before flue gas heat-exchange unit 3, and dehydration arranges dewater unit 9 in branch road.Former moisture content of coal is higher than 5% time, need remove flue gas moisture by this dewater unit 9 from a wind and smoke gas of recirculation blower 8, entering flue gas heat-exchange unit 3 by booster fan 10 rear sections again heats, and the flue gas not heating with another part after flue gas heat-exchange unit 3 mixes, by the two-part flue gas ratio of valve regulated, for regulating the flue-gas temperature that enters coal pulverizer 11.One time air circulating system arranges coal pulverizer 11 after flue gas heat-exchange unit 3, and coal pulverizer 11 is connected with a feeder 13, and an air circulating system finally connects an air channel of turbulent burner 2.
The Secondary Air circulatory system is being connected with the secondary air duct of turbulent burner 2 after flue gas heat-exchange unit 3, and the flue gas of the Secondary Air circulatory system is inputted burner hearth in secondary air duct with after 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, inner second air road 15, outer second air road 16, burner secondary air box 17, oxygen conveying pipe 18, spout annular oxygen room 19 and oxygen spray pipe 20.Wherein an air channel 14 can adopt spiral case air intake or arrange that cyclone produces a wind and rotates into burner hearth, also can adopt wind of direct current to spray into burner hearth.
One time air channel arranges an annular oxygen room 19 apart from ducting outlet a distance, and oxygen room 19 communicates with an air channel by being distributed in an oxygen spray pipe 20 on air channel.In a preferred embodiment, annular oxygen room 19 is 1000mm apart from ducting outlet distance.Oxygen spray pipe 20 is evenly arranged in oxygen room, and jet pipe quantity can be 3-12, and jet pipe is connected with annular oxygen room 19, by oxygen conveying pipe 18, pure oxygen is sent into annular oxygen room, and sprays in stove from oxygen spray pipe.In the present embodiment, inner second air is direct current form, does not arrange swirl vane.In outer secondary road, arrange cyclone 21, Secondary Air is produced spray in stove after rotation combustion-supporting.
When boiler operatiopn, the flue gas of generation enters deduster 4 after by flue gas heat-exchange unit 3, and the flue gas of discharging from deduster 4 is divided into two parts, and a road enters atmosphere from chimney 6 after air-introduced machine 5, or passes through CO 2purifying processing device (CPU) 7 is processed; Another road flue gas enters flue gas recirculation loop after being boosted by recirculation blower 8, flue gas recirculation loop is divided into air circulating system and the Secondary Air circulatory system, one time air circulating system provides once air-dry dry powder feeding required exhaust gas volumn, and the Secondary Air circulatory system provides secondary wind-heat flue gas and oxygen mix to enter burner secondary air box.The equipment that air-separating plant 12 is known for industry, air is by entrance 121 accesss to plant, and by 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 an air circulating system, when former moisture content of coal is high, provide the flue gas of once air-dry dry powder feeding after recirculation blower 8, need remove flue gas moisture by moisture removal device 9, increased after processing by a wind booster fan 10, a part heats by flue gas heat-exchange unit 3, and is mixed to 200-500 ℃ of left and right with the flue gas that another part does not heat and enters coal pulverizer again, 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 by the coal dust grinding.Moisture removal device 9 is provided with bypass duct, when former moisture content of coal is low or when air burning, flue gas recycled enters flue gas heat-exchange unit 3 preheatings by bypass duct.
In the Secondary Air circulatory system, pure oxygen one tunnel being provided by air-separating plant 12 enters the annular oxygen room 19 of an about 1000mm of wind snout peripheral distance spout of burner through oxygen conveying pipe 18, and spray in wind pipeline of burner by be communicated with 3-12 the oxygen spray pipe 20 being circumferentially evenly arranged with annular oxygen room, mix with a wind/breeze airflow.Another road pure oxygen enters from secondary air duct oxygen intake 172, mixing with the flue gas entering from secondary air duct smoke inlet 171, enter burner secondary air box, and through burner secondary air duct inner second air road and/or outer second air road enter burner hearth, coal dust firing requisite oxygen amount is provided.Described secondary wind-heat flue gas is provided by recirculation blower 8, and is heated to 200-500 ℃ by flue gas heat-exchange unit 3.Above-mentioned total oxygen volume flow accounts for and enters wind of burner hearth and the 20-40% of Secondary Air 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, sends into deduster 4, thereby go round and begin again operation after tail flue gas heat exchanger 3.
Fig. 3 is the vortex burner structural representation under second embodiment of the present invention.In this embodiment, the inner second air road 15 of turbulent burner 2 contains cyclone 21, makes the mixture of secondary wind-heat flue gas and pure oxygen spray into burner hearth in generation rotation behind burner inner second air road.In the outer second air road of burner, there is no cyclone, the mixture of secondary wind-heat flue gas and pure oxygen does not produce eddy flow behind burner outer second air road, 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, in the inside and outside secondary air duct of turbulent burner 2, all contain cyclone 21, the mixture that makes secondary wind-heat flue gas and pure oxygen sprays into burner hearth all producing rotation after secondary air duct inside and outside burner.
Although 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 by appended claims.Those skilled in the art is not deviating under the prerequisite of principle of the present invention and essence, can make various changes or modifications to these embodiments, but these changes and modification all fall into protection scope of the present invention.

Claims (9)

1. an oxygen-enriched combustion system, is characterized in that, described system comprises:
One boiler body, comprises a smoke-exhaust pipeline;
One turbulent burner, comprises air channel and secondary air duct, is arranged on described boiler body;
An air circulating system, connects an air channel of described smoke-exhaust pipeline and described turbulent burner;
The Secondary Air circulatory system, connects the secondary air duct of described smoke-exhaust pipeline and described turbulent burner;
One oxygen system, is connected with a described air channel and secondary air duct and inputs oxygen;
A described air circulating system and the Secondary Air circulatory system are all through a flue gas heat-exchange unit and a recirculation blower, a described air circulating system comprises a dehydration branch road, described dehydration branch road arranges a dewater unit, this air circulating system arranges a booster fan and this dehydration branch road before this flue gas heat-exchange unit, in this dehydration branch road, this dewater unit is set, at former moisture content of coal higher than 5% time, the wind and smoke gas coming from this recirculation blower need remove flue gas moisture by this dewater unit, entering this flue gas heat-exchange unit by this booster fan rear section again heats, and the flue gas not heating with another part after this flue gas heat-exchange unit mixes, by the two-part flue gas ratio of a valve regulated, for regulating the flue-gas temperature that enters a coal pulverizer.
2. oxygen-enriched combustion system as claimed in claim 1, is characterized in that: a described air channel arranges an annular oxygen room apart from ducting outlet one preset distance place, and described oxygen room is evenly distributed on an oxygen spray pipe on air channel by one and communicates with an air channel.
3. oxygen-enriched combustion system as claimed in claim 2, is characterized in that: described oxygen system comprises an air-separating plant, and an isolated oxygen part is by an air channel of described oxygen spray pipe input, and another part is inputted secondary air duct.
4. oxygen-enriched combustion system as claimed in claim 2, is characterized in that: the oxygen volume flow of described oxygen system input accounts for and enters 20%~40% of the total volumetric flow of gas of burner hearth.
5. oxygen-enriched combustion system as claimed in claim 1, is characterized in that: a described air circulating system comprises this coal pulverizer, inputs described burner hearth together with the flue gas recycled in the coal dust of its generation and an air channel.
6. the oxygen-enriched combustion system as described in claim 1 to 5 any one, is characterized in that: described turbulent burner secondary air duct comprises outer second air road and inner second air road.
7. oxygen-enriched combustion system as claimed in claim 6, is characterized in that: described outer second air road arranges a cyclone.
8. oxygen-enriched combustion system as claimed in claim 6, is characterized in that: described inner second air road arranges a cyclone.
9. oxygen-enriched combustion system as claimed in claim 6, is characterized in that: described outer second air road and inner second air road respectively arrange a cyclone.
CN201210058768.5A 2012-03-07 2012-03-07 Oxygen enriched combustion system Active CN102588997B (en)

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Publication number Priority date Publication date Assignee Title
CN106594718A (en) * 2016-12-28 2017-04-26 浙江宜清环境技术有限公司 Parallel-flow type oxygen-enriched burner device used for pulverized coal boiler
CN110207106A (en) * 2019-05-15 2019-09-06 哈尔滨锅炉厂有限责任公司 A kind of coal dust oxygen-enriched burner and its system meeting unit depth peak regulation requirement

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CN100441946C (en) * 2006-11-09 2008-12-10 华中科技大学 Boiler system of circulating fluid bed burning in oxygen enrichment
EP2267367B1 (en) * 2008-03-06 2014-11-26 IHI Corporation Method and apparatus of controlling oxygen supply in oxyfuel combustion boiler
JP5271689B2 (en) * 2008-12-19 2013-08-21 三菱重工業株式会社 Boiler equipment
JP4896194B2 (en) * 2009-09-30 2012-03-14 株式会社日立製作所 Oxyfuel boiler plant
CN101825278B (en) * 2010-05-28 2012-01-25 华中科技大学 Oxygen-rich combustor
CN102305415B (en) * 2011-10-18 2013-10-09 上海锅炉厂有限公司 Plasma oil-free ignition system in oxygen-enriched environments

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