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《Journal of Civil,Architectural & Environmental Engineering》 2009-02
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The Optimization Method of Biomass Granule Parameter for Pyrolysis Liquefaction

LONG En-shen1,HUANG Lu-hong1,2,JIANG Lin3,CHEH Jin-hua3(1.College of Architecture & Environment,Sichuan University,Chengdu 610065,P.R.China;2.College of Geography & Resource Science,Sichuan Normal University,Chengdu 610101,P.R.China;3.Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment,Ministry of Education,Chongqing 400045,P.R.China)  
To make the biomass tablets heated fully in a fluidized pyrolysis liquefaction process,it ought to be ensured that sufficient biomass granules stay long enough in the bed so as to meet or exceed the expected pyrolysis temperature.That is,the prerequisite is that the staying time must be more than or equal to the pyrolysis time.However,the staying time is decided by the flow speed and CFB parameters,and the pyrolysis time is controlled by the heat transfer process of biomass particles in a fluidized bed both of which are closely related to the parameters of biomass particles.This paper analyses the heat transfer process of the biomass in the pyrolysis reaction tower,establishes a simplified model of heat transfer with a gas-solid flow,studies the rule of pyrolysis time and staying time changing with the biomass size and finds out a theoretical method of selecting the expected parameters of biomass granule to ensure the full pyrolysis of biomass materials.
【Fund】: 国家科技攻关计划资助项目(2003BA808A19-5);; 中国博士后基金资助项目(20060400195)
【CateGory Index】: TK6
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