CN101580740B - Preheated multistage air distribution gasification process for fixed bed straws - Google Patents

Preheated multistage air distribution gasification process for fixed bed straws Download PDF

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Publication number
CN101580740B
CN101580740B CN2009100253678A CN200910025367A CN101580740B CN 101580740 B CN101580740 B CN 101580740B CN 2009100253678 A CN2009100253678 A CN 2009100253678A CN 200910025367 A CN200910025367 A CN 200910025367A CN 101580740 B CN101580740 B CN 101580740B
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CN
China
Prior art keywords
gasification
hot blast
vapourizing furnace
air distribution
straws
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CN2009100253678A
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Chinese (zh)
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CN101580740A (en
Inventor
林冲
陈勇
孙昌栋
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徐州燃控科技股份有限公司
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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
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/10Process efficiency
    • Y02P20/129Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines

Abstract

The invention relates to a preheated multistage air distribution gasification process for fixed bed straws. A thermal gasification medium is firstly heated in a pre-heater, and the heated gasificationmedium in a hot air distribution container is delivered into a gasification furnace by section to establish a good reaction condition of a sodium hydroxide gasification furnace so as to improve the g asification efficiency and combustion heat value. Because the gasification medium is preheated and then subjected to multistage air distribution gasification, the efficiency of gasification reaction of the straws is improved, the physical sensible heat carried by fuel gas is fully utilized, the thermal value of the fuel gas is improved at the same time, the clinker content is reduced, the discharge amount of greenhouse gases in China can be reduced, and the process is clean and environment-friendly.

Description

A kind of preheated multistage air distribution gasification process for fixed bed straws

Technical field

The present invention relates to a kind of fixed bed straw gasification process, is a kind of preheated multistage air distribution gasification process for fixed bed straws.

Background technology

China is a large agricultural country, stalk output is huge, Gasification Technology is a suitable for China, clean environment firendly, reproducible energy technology, not only can be vast rural area cleaning, gas energy easily are provided, the various pollution problems that simultaneously also can avoid stalk to cause more can reduce the greenhouse gas emissions of China.Although China has developed multiple stalk gasifier at present, but, almost domestic all middle-size and small-size fixed bed straw gasification stoves all are as the vapourizing furnace medium take air, because the combustion calorific value of biomass self is not high, 79% N2 will absorb a large amount of heat and not participate in gasification reaction in gasifying medium, therefore, all there is the common disadvantage that gasification efficiency is low, fuel gases calorific value is low, ash content carbon is high.Although adopt pure oxygen (or being aided with water vapour) also can significantly improve fuel gases calorific value and gasification efficiency as gasifying medium,, the rural area does not also satisfy the requirements and uses at present.To this, also there is not at present highly effective terms of settlement.

Summary of the invention

Problem according to the straw from village vapourizing furnace existence of present China, the present invention proposes a kind of preheated multistage air distribution gasification process for fixed bed straws, this process makes full use the energy of biomass itself---namely reduce ash content carbons by various means, take full advantage of the physics sensible heat of combustion gas, as far as possible the chemical energy of biomass is converted into the chemical energy of combustion gas.Utilize the waste-heat gasifying medium of the rear combustion gas of reaction, be used for the heat that N2 heats up with reducing burning, the reduction air capacity, improve efficiency of combustion, reduce ash content carbon, can rapidly the energy storage of biomass be converted into the chemical energy of combustion gas, thereby fuel gases calorific value is greatly improved.

The present invention solves the concrete scheme that its technical problem adopts: the vapourizing furnace of a tubular that is surrounded by metal sheet is arranged in this technique, and the vapourizing furnace periphery is separately installed with from top to bottom that the upper air inlet that leads in the vapourizing furnace is chewed, nozzle and lower hot-blast outlet; In a side of vapourizing furnace, be separately installed with hot blast and distribute header, preheater and blower fan; The upper air inlet of vapourizing furnace is chewed, and order is by damper, and heating duct distributes header to be communicated with hot blast, and order is by bellows respectively for nozzle, and damper, heating duct distribute header to be communicated with hot blast; Hot blast distributes header to be communicated with the heat exchange element of preheater by the female pipe of hot blast, and sequentially is communicated with blower fan by cold-air duct, and hot-blast outlet distributes header sequentially to be communicated with by airway with preheater and hot blast, thereby makes vapourizing furnace be sent constantly into hot blast; The hot gas medium at first is heated in preheater, and the gasifying medium after the heating is segmented in hot blast distribution header and sends into vapourizing furnace, to set up good vapourizing furnace reaction conditions, improves gasification efficiency and fuel gases calorific value with this; Utilize gasifying medium to reclaim combustion gas, sensible heat, the Heating temperature of gasifying medium is 110 ℃~500 ℃.

Its beneficial effect is: the present invention carries out carrying out multipole air distribution gasification after the preheating to gasifying medium, improved the efficient of the gasification reaction of stalk, take full advantage of the entrained physics sensible heat of combustion gas, also improved simultaneously the calorific value of combustion gas, reduced cinder content, more can reduce the greenhouse gas emissions of China, more clean environment firendly.

Description of drawings

The invention will be further described below in conjunction with accompanying drawing;

Accompanying drawing is structural principle synoptic diagram of the present invention;

Among the figure, 1. blower fan, 2. cold-air duct, 3. preheater, 4. heat exchange element, 5. gas outlet pipe, the 6. female pipe of hot blast, 7 hot blasts distribute header, 8. heating duct, 9. heating duct, 10. heating duct, 11. damper, 12. dampers, 13. dampers, 14. airway, 15. bellows, 16. nozzles, 17. bellows, 18. nozzles, 19. vapourizing furnaces.

Embodiment

In the drawings, the vapourizing furnace 19 of a tubular that is surrounded by metal sheet is arranged in this technique, vapourizing furnace 19 peripheries are separately installed with from top to bottom that the upper air inlets that lead in the vapourizing furnace 19 are chewed, nozzle 18,16 and lower hot-blast outlet; In a side of vapourizing furnace, be separately installed with hot blast and distribute header 7, preheater 3 and blower fan 1; The upper air inlet of vapourizing furnace 19 is chewed, and order is by damper 11, and heating duct 8 distributes header 7 to be communicated with hot blast, and order is by bellows 17,15 respectively for nozzle 18,16, and damper 12,13, heating duct 9,10 distribute header 7 to be communicated with hot blast; Hot blast distributes header 7 to be communicated with the heat exchange element 4 of preheater 3 by the female pipe of hot blast 6, and sequentially passes through cold-air duct 2 and be communicated with blower fan 1; Hot-blast outlet distributes header 3 orders to be communicated with by airway 14 and preheater 3 and hot blast, thereby makes vapourizing furnace be sent constantly into hot blast; The hot gas medium at first is heated in preheater 3, and the gasifying medium after the heating is segmented in hot blast distribution header 7 and sends into vapourizing furnace, to set up good vapourizing furnace reaction conditions, improves gasification efficiency and fuel gases calorific value with this; Utilize gasifying medium to reclaim combustion gas, sensible heat, the Heating temperature of gasifying medium is 110 ℃~500 ℃.

In the drawings, the heat exchange element 4 of preheater 3 sent into freezing air by blower fan 1 by cold-air duct 2, air is heated to 110 ℃~500 ℃ temperature by heat exchange element 4 by high-temperature fuel gas, and warm air enters hot blast through the female pipe 6 of hot blast and distributes header 7, and warm air is assigned to three strands in this case.First strand of wind enters vapourizing furnace 19 interior bed of material upper spaces through airduct 8, and its flow is by damper 11 controls, and the size of this strand air quantity can affect drying and the pyrolysis rate of stalk; Second strand of wind enters bellows 17 through airduct 9 and sprays in the stove by nozzle 18, and its flow is by damper 12 controls; The 3rd strand of wind enters bellows 15 through airduct 10 and sprays in the stove by nozzle 16, and its flow is by damper 13 controls.Regulate the air quantity of second and third strand wind and can regulate the variation of area size, height location and the temperature of combustion centre.

In the drawings, gasification reduction reaction section in the biomass pyrolytic burning, because gasification reaction is the heat absorption reduction reaction, the heat that hot blast and burning are brought is all supplied with reduction and gaseous conversion zone, the whole body of heater 19 outside lagging materials that adopt are adiabatic, in addition heating duct 8,9,10, the female pipe 6 of hot blast, hot blast distribute header 7, airway 14, bellows 15,17 and preheater 3 all lay lagging material to reduce thermosteresis.

The factors such as the kind of stalk, water content, ash content all can be to the pyrolysis that exerts an influence of its pyrolysis and gasification property, adopt 2 grades~8 grades air distribution mode in biological pyrolysis, combustion reactions section, one level air-distribution is used for control drying and pyrolysis, and other level air-distribution is used for organizing gasification reaction conditions.Make reaction conditions reach optimizing by the large I of regulating all the other strands air quantity, utilize gasifying medium to reclaim the combustion gas sensible heat with the share of minimizing stalk perfect combustion, thereby can improve the calorific value of gasification efficiency and combustion gas.

Claims (3)

1. preheated multistage air distribution gasification process for fixed bed straws, the vapourizing furnace (19) that a tubular that is surrounded by metal sheet is arranged in this technique, vapourizing furnace (19) periphery are separately installed with from top to bottom that the upper air inlet that leads in the vapourizing furnace (19) is chewed, nozzle B (18), nozzle A (16) and lower hot-blast outlet; In a side of vapourizing furnace, be separately installed with hot blast and distribute header (7), preheater (3) and blower fan (1); The upper air inlet of vapourizing furnace (19) is chewed, order is by damper A (11), heating duct A (8) distributes header (7) to be communicated with hot blast, and nozzle B (18) distributes header (7) to be communicated with by bellows B (17), damper B (12), heating duct B (9) with hot blast; Nozzle A (16) distributes header (7) to be communicated with by bellows A (15), damper C (13), heating duct C (10) with hot blast; Hot blast distributes header (7) to be communicated with the heat exchange element (4) of preheater (3) by the female pipe of hot blast (6), and order is communicated with blower fan (1) by cold-air duct (2); Thereby make vapourizing furnace be sent constantly into hot blast; It is characterized in that: the hot gas medium at first is heated in preheater (3), after being heated gasifying medium distribute header (7) to be segmented at hot blast to send into vapourizing furnace (19), to set up good vapourizing furnace reaction conditions, improve gasification efficiency and fuel gases calorific value with this.
2. a kind of preheated multistage air distribution gasification process for fixed bed straws according to claim 1, it is characterized in that: in the gasification reduction reaction section of biomass pyrolytic burning, the heat that hot blast and burning are brought is all supplied with reduction and gaseous conversion zone, the outside lagging material that adopts of whole body of heater (19) is adiabatic, in addition heating duct A (8), heating duct B (9), heating duct C (10), the female pipe of hot blast (6), hot blast distributes header (7), airway (14), bellows A (15), bellows B (17) and preheater (3) all lay lagging material to reduce thermosteresis.
3. a kind of preheated multistage air distribution gasification process for fixed bed straws according to claim 1, it is characterized in that: adopt 2 grades~8 grades air distribution mode in biomass pyrolytic, combustion reactions section, one level air-distribution is used for control drying and pyrolysis, and other level air-distribution is used for organizing gasification reaction conditions.
CN2009100253678A 2009-03-12 2009-03-12 Preheated multistage air distribution gasification process for fixed bed straws CN101580740B (en)

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CN101580740B true CN101580740B (en) 2013-03-06

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102443445B (en) * 2011-02-13 2014-02-12 大兴安岭兴森能源高科技有限责任公司 Process and device for continuously gasifying biomass and simultaneously removing tar in moving bed
CN102220173A (en) * 2011-05-16 2011-10-19 徐州燃控科技股份有限公司 Biomass gasifier with fixing bed and air distribution process thereof
CN102492489A (en) * 2011-12-08 2012-06-13 上海交通大学 Biomass staged oxygen-supplying gasification furnace and gasification method
CN103571542A (en) * 2012-08-10 2014-02-12 王振孝 Hydrocarbon energy conversion method and hydrogen-rich gas generating furnace
CN105018146A (en) * 2015-07-06 2015-11-04 上海应用技术学院 Latch type versatile biomass gasification furnace

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1375540A (en) * 2001-03-16 2002-10-23 中国林业科学研究院林产化学工业研究所 Biomass internally circulating conic fluidized bed gasifying process and equipment
CN2760036Y (en) * 2005-01-06 2006-02-22 靳开亮 Stalk gasifying furnace

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1375540A (en) * 2001-03-16 2002-10-23 中国林业科学研究院林产化学工业研究所 Biomass internally circulating conic fluidized bed gasifying process and equipment
CN2760036Y (en) * 2005-01-06 2006-02-22 靳开亮 Stalk gasifying furnace

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Address after: 221004 No. 12 Yang Shan Road, Xuzhou Economic Development Zone, Jiangsu, China

Patentee after: XUZHOU KERONG ENVIRONMENTAL RESOURCES CO., LTD.

Address before: 221004 No. 12 Yang Shan Road, Xuzhou Economic Development Zone, Jiangsu, China

Patentee before: Xuzhou Combustion Control Research Institute Co., Ltd.