密相输运床的团聚物频率和持续时间  

Cluster frequency and existence time in dense transport bed

作　　者：曾鑫[1,2] 阳绍军[1,2] 王圣典[1,2] 赵凯[1,2] 徐祥[1,2] 肖云汉[1,2] 

机构地区：[1]中国科学院能源动力研究中心,北京100190 [2]中国科学院先进能源动力重点实验室(工程热物理研究所),北京100190

出　　处：《化工学报》2013年第5期1614-1620,共7页CIESC Journal

基　　金：国家高技术研究发展计划项目(2006AA05A103);中国科学院知识创新重要方向性项目(KGCX2-YW-348)~~

摘　　要：在内径0.102m、高17m的密相输运床冷态实验台上,以石英砂(属Geldart B类颗粒)作为循环物料,对光纤探针在表观气速8.2～11.2m.s-1,固体循环流率139～530kg.m-2.s-1下获得的瞬态信号,采用小波分析的方法研究了团聚物频率、团聚物持续时间。结果表明:提升管边壁与底部区域更易形成大尺度团聚物,径向上团聚物频率中心高边壁低,而团聚物持续时间中心短边壁长。轴向上提升管底部团聚物频率低、持续时间长。团聚物频率随表现气速增大而增大,而团聚物持续时间随表现气速增大而缩短,提升管底部团聚物频率随固体循环流率增大而降低,团聚物持续时间随固体循环流率增大而变长。Cluster characteristics（cluster frequency and cluster existence time）were investigated with wavelet analysis in a cold dense transport bed with Geldart B particle using a fiber optic probe.The superficial gas velocities and solids circulating rate were in the range of 8.2—11.2 m·s^-1 and 139—530 kg·m^-2·s^-1,respectively.The results indicated that large scale clusters were easier to form in the near wall and bottom zone than in the center and the top zone of the riser,respectively.Cluster frequency decreased from center to wall,while cluster existence time increased from center to wall.Cluster frequency increased with increasing superficial gas velocity,while cluster existence time decreased with increasing superficial gas velocity.At the riser bottom,cluster frequency decreased with increasing solids circulating rate while cluster existence time increased with increasing solids circulating rates.

关 键 词：密相输运床 光纤探针 团聚物 小波分析 

分 类 号：TQ021[化学工程] TQ022.3