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运用基于硬球理论的离散型模型模拟了气固流态化的基本特征,观察了操作条件对鼓泡流化的影响.其模拟结果表明:1.气体通过分布板后形成许多气泡.最初,这些气泡以较小的尺寸形成在孔口,然后逐渐长大并上升.当气泡到达床层表面而破裂时,导致了床层表面的波动.2.床层中的压降随着气体速度和气体分布板中孔数的增加而增加.从而增加气体速度和分布板孔数将产生更多的气泡,并改进颗粒间的混合程度.3.与国际上现有离散型模型相比,基于颗粒运动分解思想的硬球模型更为真实、更为简单.它能够定性而形象地复现气固流化系统的实验特征,为实验预测提供辅助的研究方法.“,”In this paper, the basic characteristics of gas-solid fluidization are simulated by using the discrete model based on hard-sphere theory. Here the simulations are performed by using 20,000 particles with 560μm, so the simulation scale is larger than that of previous works. Compared with the soft-sphere model, our model is simple and takes less time, in which no special care must be taken in calculations. From our simulations, it can be seen that gas flow through the distributor and forms many bubbles. Some of them break at the bed surface, leading to the fluctuation of bed surface. The pressure drop increases with increasing gas velocity and orifice number of gas distributor, leading more bubbles to be produced. Therefore, the inter-particle mix degree can be improved by increasing the gas velocity and the orifice number of gas distributor.