【摘要】 基于计算颗粒流体力学(CPFD)方法,进行了三维流化床局部堵塞模拟研究。通过观察局部堵塞对床内流化状态及混合特性的影响,对产生高浓度区域的影响因素进行了分析。结果表明:局部堵塞会导致床内存在高浓度区域,影响床内颗粒的混合;局部堵塞导致的高浓度区域呈向周围扩散的趋势;随着流化风速的增大,高浓度区域扩散程度减弱,床层高度对其扩散程度的影响较小,堵塞面积的增大在一定程度上会增强高浓度区域的扩散程度。更多还原

【Abstract】 Based on the method of computational particle fluid dynamics(CPFD), a three-dimensional fluidized bed with partial blockage in the distributor was simulated. By simulating the effects of partial blockage on the fluidization state and mixing characteristics in the bed, the factors affecting the high concentration region caused by partial blockage were analyzed. Simulation results show that partial blockage may lead to a high concentration area in the bed, which affects the mixing of particles, and the high concentration area tends to diffuse to the periphery. As the gas velocity increases, the diffusion degree of high concentration region decreases, which is slightly influenced by the bed height. The increase in blockage area enhances the degree of diffusion to some extent.更多还原