基于有效参数法的固定床化学链燃烧数值模拟

本文基于有效参数法和变核颗粒模型，对固定床化学链燃烧进行数值模拟．计算并分析不同颗粒参数对二维固定床化学链燃烧结果的影响．在有效参数模型中，颗粒填充床被看作均匀的流体域．本文主要模拟了组分场和温度场，通过改变颗粒直径、孔隙率、内部粒子直径三组参数，取得了不同条件下二维固定床化学链燃烧床层所能达到的最高温度以及反应所用的时间．通过对不同参数模拟结果的分析，得出颗粒内部结构对反应特性的影响规律．

Numerical Simulation of Chemical Looping Combustion in Packed Bed Based on the Effective Parameter Method

Chemical looping combustion (CLC) in packed bed reactors was simulated with the effective parameter homogeneous model and the Changing Grain Size Model (CGSM). In the effective parameter model, the particle packed bed is assumed as homogeneous fluid domain for the effective heat and mass transfer. The concentration field and temperature field were obtained by solving the effective parameter model equations with finite difference method. The particle diameter, the initial particle porosity and internal grain diameter were used as the study parameters. Based on the simulation results, the highest temperature and reaction time of two-dimensional on packed bed CLC have been achieved. The influences of the parameters were investigated in details. The results may be helpful for designing and optimizing packed bed CLC reactors.