Numerical Modeling of Pyrolysis of Sawdust in a Packed Bed
An unsteady,one-dimensional mathematical model has been developed to describe the pyrolysis of sawdust in a packed bed.The sawdust bed was pyrolyzed using the hot gas and an electric heater outside the bed as the source of energy.The developed model includes mass,momentum and energy conservations of gas and solid within the bed.The gas flow in the bed is modeled using Darcys law for fluid through a porous medium.The heat transfer model includes heat conduction inside the bed and convection between the bed and the hot gas.The kinetic model consists of primary pyrolysis reaction.A finite volume fully implicit scheme is employed for solving the heal and mass transfer model equations.A Runge-Kutta fourth order method is used for the chemical kinetics model equations.The model predictions of mass loss history and temperature were validated with published experimental results,showing a good agreement.The effects of inlet temperature on the pyrolysis process have been analyzed with model simulation.A sensitivity analysis using the model suggests that the predictions could be improved by considering the second reaction which could generate volatile flowing in the void.
modeling pyrolysis sawdust packed bed
Qingmin Meng Xiaoping Chen
School of Energy and Environment,Southeast University,Nanjing 210096,China
国际会议
The 7th International Symposium on Coal Combustion(第七届国际煤燃烧学术会议)
哈尔滨
英文
156-160
2011-07-19（万方平台首次上网日期，不代表论文的发表时间）