生物质在下降管内的热裂解动力学研究

Investigation of Kinetic Model of Biomass Usinga Down-flow Tube Reactor

为研究陶瓷球热载体加热工艺下生物质在下降管内的快速热解的挥发特性,在热解温度分别为723,773,823K,下降距离分别为150,550,850,1 150mm工况下,对40～46目的玉米秸秆粉末进行了热解实验,利用一级动力学反应模型研究了生物质的热解动力学过程。实验数据与模型计算表明,生物质热解挥发程度随温度的升高和下降距离的增大而增大,实验数据和理论模型吻合性较好。

A down-flow tube reactor was designed for the purpose of investigating the pyrolysis volatilization characteristics of biomass particles at fast heating rata in a reactor which using ceramic balls as heat carriers.With the reaction temperatures were 723K,773K,823K,respectively,and the falling distances,were 150mm,550mm,850mm and 1150mm.Pulverized corn stalk particle mesh,ranging from 40 to 46 was used.An Arrhenius first-order rate kinetic model was used to study the pyrolysis kinetics process of biomass.Comparison of model calculation and experimental datas shows that the degree of pyrolysis add with Reaction temperatures and falling distances,and the experimental data fit theoretical models well.