基于MP-PIC模型的流化床煤气化过程三维数值模拟

Three-Dimensional Numerical Simulation of Fluidized Bed Coal Gasification Based on MP-PIC Method

本文以多相流质点网格模型(MP-PIC)为基础,采用欧拉-拉格朗日方法,建立了流化床煤气化过程的三维可压缩数理模型,该模型同时考虑了稠密气固流动,传热传质和相内、相间的化学反应。通过不同操作参数下模拟计算,获得反应器内的流型、气体组分分布、化学反应速率变化等规律。模型计算所得的出口气体组分与实验结果进行了比较,数值模拟与实验吻合。

A comprehensive three-dimensional numerical model has been developed to simulate the coal gasification in a fluidized bed gasifier.The methodology is based on the multiphase particle-in-cell （MP-PIC） model,which is a form of Eulerian-Lagrangian approach.Dense particulate flow,mass and heat transfer,homogeneous and heterogeneous chemistry between phases and within the fluid mixture are considered.The formation of flow patterns,profiles gas compositions,distributions of reaction rates were investigated under different operating conditions.The calculated product gas compositions compare well with the experiments.