褐煤微波流化床干燥数值模拟及实验研究

Numerical Simulation and Experiment Study on Lignite Drying in Microwave Fluidized Bed

基于欧拉多相流模型对微波流化床褐煤流化特性和干燥特性进行了数值模拟和实验研究。结果表明:随着微波功率和热风速度的增大,微波流化床褐煤的流化质量显著提高,干燥速率也随之增大。通过与实验结果对比发现,褐煤含水率数值模拟值稍微低于实验值。褐煤微波流化床干燥传热系数随着微波功率、气体温度和气体速度的增大而增大,随着干燥时间的延长传热系数则逐渐减小。

The fluidization characteristics and drying characteristics of lignite drying in a microwave fluidized bed were simulated based on Euler multiphase flow model. The results show that, the fluidization quality and drying rate of lignite increased with microwave power and air temperature increasing. By comparing to the experimental data, the simulation results of lignite moisture is slightly lower than the experimental value. The heat transfer coefficients of lignite drying increased with the increasing of microwave power, gas temperature and gas velocity, while decreased with drying time increasing.