喷动流化床流动特性数值模拟

Numerical simulation on flow characteristics of spouted-fluidized bed

为了捕捉喷动流化床中微观层次上的颗粒运动信息,建立了基于CFD的二维非稳态喷动流化床欧拉-欧拉两相流模型。分析了不同流化气速对喷动流化床气固流动特性的影响,即不同工况下的炉内压力降、颗粒浓度、床内空隙率分布、气体速度分布和固体颗粒速度分布。数值模拟研究结果表明:随流化气速的增大,压降和炉内平均空隙率逐渐增大,密相床层高度逐渐增加,沿着轴向方向的气体流量增大,喷动气的射流深度逐渐增加,同时射流半径也逐渐增加。

To capture particle motion information in mesoscopic level in spouted-fluidized bed, develop a two-dimension based on CFD unsteady eulerian multi-phase flow model to simulate the flow characteristics in spouted fluidized bed. Analyse the effect of fluidizing gas velocities on flow characteristics of the spout-fluid bed through numerical simulation methods. And specifically, furnace pressure drop, particle concentration, the distribution of voidage, gas velocity and solid particle velocity in spouted fluidized bed under different working conditions. The results show that, with the increase of fluidizing gas velocity, the pressure drop, average voidage and the height of dense-phase bed increase. Along the axial direction, the jet depth and jet radius of spouting gas increase with the increase of the fluidizing gas velocity.