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以直径0.06m、高5m的高通量循环床提升管中气固两相流大量试验数据为基础,考察在高颗粒循环量和较高气体表观流速下,平均粒径为140μm、密度为2700kg/m3的GeldartB类颗粒气固流动特性。试验发现,截面平均颗粒浓度分布总体上为下浓上稀,并随操作气速的增大而减小,悬浮上升流动结构区域随着颗粒循环速率的增大而向上延伸。滑移因子、截面平均颗粒浓度与无量纲滑移速度之间存在显著相关性。此外,床层总压降和截面平均颗粒浓度随固气质量比的增加而增加,在上升管下部截面平均颗粒浓度受固气质量比的影响比上部大。
Based on a large amount of experimental data of gas-solid two-phase flow in a high-throughput circulating-bed riser with a diameter of 0.06m and a height of 5m, the average particle size was 140μm at a high particle circulation rate and a high apparent gas flow rate, Gas-solid Flow Characteristics of GeldartB Particles at 2700kg / m3. The experimental results show that the distribution of average particle concentration in cross section is generally lower and upper dilute, and decreases with the increase of operating gas velocity. The area of the ascending and descending flow structure extends upwards as the particle circulation rate increases. There is a significant correlation between slippage factor, cross-sectional average particle concentration and non-dimensional slip velocity. In addition, the total bed pressure drop and cross-sectional average particle concentration increased with the increase of solid-gas mass ratio. The average particle concentration in the lower section of the riser was affected by the mass ratio of solid to gas more than the upper part.