摘要
应用热解的分布活化能模型,考虑生物质热解的吸热效应,对生物质颗粒在热载体流化床中的热解过程进行了数值计算,计算结果表明:由于导热热阻的存在,生物质颗粒内部存在一定的温度分布,开始时表面和中心温差较大,随着时间的推移,颗粒内部逐渐趋于等温;生物质颗粒的热解时间随粒径的增大而增加;在0.5～2.0m/s的气速计算范围内,生物质颗粒的热解时间随操作气速的升高而缩短,随床温的升高而减小;热解吸热效应对生物质颗粒挥发份释放过程影响很大,在计算的时候不能予以忽略。
In this paper, a numerical modelling for the pyrolysis of biomass particle in fluidized bed of heat carrier was conducted on the basis of Distributed Activated Energy Model （DAEM）. A sot of equation reflecting the heat transfer and pyrolysis reaction of biomass particle in the fluidized bed of heat carrier was established. The heat of devolatilization was considered in the model. The calculation result show that the heat of devolatilization can not be neglected. The influence of particle diameter, the bed temperature and the superficial velocity on the pyrolysis process was also discussed.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2008年第7期905-909,共5页
Acta Energiae Solaris Sinica
