【摘要】 运用计算颗粒动力学(Computation Particle Fluid Dynamics)Barracuda软件对一种低流动阻力的N型回料阀内的气固流动特征进行了数值模拟研究,研究了操作参数(充气量以及松动风比例等)的变化对其流动特征和返料特性的影响,并与U阀进行了对比。结果发现,随着总返料充气量的增加,N阀所能传递的颗粒返料率逐渐增加;保持总返料充气量不变,增加N阀松动风的比例,颗粒循环流率也逐渐增加,但相同条件下N阀的颗粒循环流率要明显大于U阀,说明N阀倾斜段的设计降低了回料阀的阻力,并减少了对松动风量的依赖。N阀的气体反窜明显低于U阀。更多还原

【Abstract】 The gas-solid flow characteristics in a new type loop-seal(N loop-seal)with low flow resistance was mainly studied by Computation Particle Fluid Dynamics numerical methods in this paper.The influence of operation parameters such as the aeration rate and the proportion of the loose-air to the gas-solid flow fields and the particle circulation rates were mainly concerned.The results were compared between N loop-seal and the U loop-seal.The results showed that the particle circulation rate increased with the total aeration rate and/or the proportion of the loose-air.N loop-seal had an advantage over the U loop-seal under the same condition.The improved slope structure of the supply chamber in N loop-seal reduced the flow resistance and the reliance to the loose-air rate.The gas inverse flow in N loop-seal is much less than that in U loop-seal.更多还原