35t/h内循环流化床锅炉流动数值模拟

Numerical Simulation of Flow Characteristics in a 35t/h Circulating Fluidized Bed Boiler

采用基于颗粒动力学理论的欧拉双流体模型,对35t/h内循环流化床锅炉炉膛的气、固流动特性进行了数值模拟。结果表明:炉膛压差的模拟值与实验值吻合较好,说明欧拉双流体模型能够准确地描述炉膛内气、固流动特性;颗粒体积分数和速度分布特性既揭示了内循环流化床中颗粒的内循环流动机理,又为内循环流化床大型化和流动结构优化提供了参考。

Making use of Euler-Euler model （EEM） which based on granular kinetic theory,the gas-solid flow in a 35t/h oil shale-combustion circulating fluidized bed boiler was simulated to show that the furnace pressure complies well with the experimental data,this indicates that Euler-Euler model can accurately demonstrate the gas-solid＇ s flow characteristics in the furnace.Both particle volume fraction distribution characteristics and particle velocity distribution characteristics can reveal inner circulation mechanism of the particles in the circulating fluidized bed.This provides a reference for the flow structure optimization of the circulating fluidized bed and its structure upsizing.