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1循环流化床脱硫塔气固流动特性CPFD模拟显示文摘采用计算颗粒流体力学(computation particle fluid dynamics,CPFD)方法对工业规模的循环流化床脱硫塔内气固两相流场进行三维、全尺寸数值模拟。在计算中充分考虑颗粒–气体、颗粒–颗粒以及颗粒–壁面之间相互作用。通过网格无关性分析和试验验证,证明所建模型及其结果的正确性,对比分析调节前后脱硫塔内部气固流场特征的变化规律。研究结果表明,调整后的气流场分布更加均匀,紊乱度更小,流体回流及返混程度降低,促进脱硫剂颗粒均匀满布塔体,从而有利于脱硫效率提高;壁面磨损率随颗粒速度增大而增大,颗粒径向运动对壁面造成的磨损较为严重;颗粒停留时间随着颗粒粒径增加而增加。根据文中计算条件,综合对比分析发现加装4片直挡板的调节方案其调节效果最佳。吴晅 刘鹏 魏楠 潘慧 李晓瑞 2020中国电机工程学报2020,40,10:4
2Effect of baffles on bubble behavior in a bubbling fluidized bed for chemical looping processes显示文摘A bubbling fluidized bed is generally used as the fuel reactor in chemical looping processes.However,in sufficient gas-solid contact remains a steadfast problem.As such,we propose the use of in ternal baffles to split bubbles at a high gas velocity and to restrict the movement of large-scale solids in the fluidized bed.We investigated the effect of baffle arrangement on the bubble size and energy,pressure gradient,particle distribution,and particle velocity in a fluidized bed using a computational particle fluid dynamics simulation based on our experimental results.We discuss the main influenci ng factors,which in elude presence of caps,number of baffles,and the baffle opening ratio.The baffle structure with caps efficiently broke the large bubbles without creating jet flow.Three baffles were deemed suitable in the bed owing to the small bubble size and uniform gas-solid distribution in each compartment.We selected a baffle opening ratio of 20.5%,which improved the flow pattern without causing a significant increase in the pressure gradient and particle velocity through the baffles.We also discussed the potential for sea ling up this baffled fluidized bed for industrial applications.Xiao Zhu Xuan Feng Yuanyuan Zou Laihong Shen 2020Particuology2020,18,6:3
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