Abstract: Flow behavior of gas and particles was numerically studied in a bubbling fluidized bed incinerator with tubular distributor. The distributions of instantaneous and time-averaged velocities of gas and particles phases, and particle concentration were obtained. Simulated results show that on the whole particles flowed up in the center, and down near the walls, and an inter-circulation of particles formed. The influences of jetting gas velocity and particle diameter on fluidization were analyzed. Numerical simulations indicate that the optimum spacing between air tubes is in the range of 1.5 to 1.75 in the present study.

Key words: tubular distributor, fluidized bed incinerator, numerical simulation

摘要： 数值模拟了管式布风装置对流化床内气体和颗粒流动特性的影响，获得了床内气体和颗粒瞬时和时均速度及颗粒体积份额分布. 计算结果表明，床内颗粒宏观流动呈现床中心区域为上升流动、壁面区域为下降流动的内循环流动. 分析了风管小孔风速和颗粒直径对床内流化的影响. 计算结果表明，保证床内颗粒和气体良好流化和混合特性的最佳布风管相对距离应在1.5~1.75之间.

关键词: 管式布风装置, 流化床焚烧炉, 数值模拟