高颗粒通量循环流化床的构型作用  

Effect of fluidized bed configuration on solids circulation rate in high solids flux circulating fluidized bed

作　　者：崔鑫[1] 汪印[1] 董利[1] 刘云义[2] 许光文[1] 

机构地区：[1]中国科学院过程工程研究所多相复杂系统国家重点实验室,北京100190 [2]沈阳化工学院化学工程学院,辽宁沈阳110142

出　　处：《化工学报》2010年第1期49-54,共6页CIESC Journal

基　　金：国家自然科学基金项目(20606034;20776144);国家高技术研究发展计划项目(2006AA05A103)~~

摘　　要：In order to achieve high solids circulation rate(Gs),an idea of coupling a moving bed to the bottom section of the riser of a circulating fluidized bed(CFB) was proposed and tested.The results from the preliminary study demonstrated that the solids circulation rate in the new-structure bed approached 370 kg·m-2·s-1 at superficial gas velocities around 10.5 m·s-1 for sand particles with an average Sauter mean size of 378 μm.This study was devoted to further justifying the effects of the coupled moving bed by performing comparative studies in two CFBs with conventional configurations.It was shown that the pressure at the riser bottom and the realized solid circulation rate were only about 15 kPa and 230 kg·m-2·s-1 in the two conventionally configured CFBs,obviously lower than 25 kPa and 370 kg·m-2·s-1 in the moving bed coupled CFB.These verified that the coupled moving bed increased the force driving particles form the particle recycling side into the riser.The study further tested the effect of a few specially designed riser exit configurations,revealing that a smooth riser exit could facilitate solids circulation to increase the solids circulation rate.In order to achieve high solids circulation rate （Gs）, an idea of coupling a moving bed to the bottom section of the riser of a circulating fluidized bed （CFB） was proposed and tested. The results from the preliminary study demonstrated that the solids circulation rate in the new-structure bed approached 370 kg · m^-2 · s^-1 at superficial gas velocities around 10.5 m · s^-1 for sand particles with an average Sauter mean size of 378μm. This study was devoted to further justifying the effects of the coupled moving bed by performing comparative studies in two CFBs with conventional configurations. It was shown that the pressure at the riser bottom and the realized solid circulation rate were only about 15 kPa and 230 kg · m^-2 · s^-1 in the two conventionally configured CFBs, obviously lower than 25 kPa and 370 kg · m^-2 · s^-1 in the moving bed coupled CFB. These verified that the coupled moving bed increased the force driving particles form the particle recycling side into the riser. The study further tested the effect of a few specially designed riser exit configurations, revealing that a smooth riser exit could facilitate solids circulation to increase the solids circulation rate.

关 键 词：高颗粒通量循环流化床 高密度循环流化床 返料驱动力 

分 类 号：TQ01[化学工程]