提升管中气固相的局部滑移速度  

LOCAL GAS-SOLID SLIP VELOCITY IN RISER

作　　者：李松庚[1] 林伟刚[1] 姚建中[1] 

机构地区：[1]中国科学院过程工程研究所多相反应实验室,北京100080

出　　处：《化工学报》2003年第1期119-123,共5页CIESC Journal

基　　金：国家重点基础研究发展规划 (No G19990 2 2 10 3);国家自然科学基金 (No 2 99360 90 )资助项目~~

摘　　要：Local slip velocity is an important factor in mass,momentum and heat transfer of riser reactors.Based on the EMMS model, the qualitative and quantitative analysis is made for local slip velocity and its components (the slip velocity in the dense phase (cluster), the slip velocity in the dilute phase and the slip velocity between dense phase and dilute phase).It is found that the slip velocity between dense phase and dilute phase makes the most contribution to the local slip velocity and clusters lead to the high local slip velocity, from which the correlation of local slip velocity with local voidage is derived.Using this correlation, the local gas-solids slip velocities in gas-solids up-risers are predicted.Calculation results are well consistent with experimental data. Furthermore, the effects of operating conditions on local slip velocities are discussed. It is concluded that local slip velocity increases with the increase of solids circulating rate and decreases with the increase of superficial gas velocity.Local slip velocity is an important factor in mass,momentum and heat transfer of riser reactors.Based on the EMMS model, the qualitative and quantitative analysis is made for local slip velocity and its components (the slip velocity in the dense phase (cluster), the slip velocity in the dilute phase and the slip velocity between dense phase and dilute phase).It is found that the slip velocity between dense phase and dilute phase makes the most contribution to the local slip velocity and clusters lead to the high local slip velocity, from which the correlation of local slip velocity with local voidage is derived.Using this correlation, the local gas-solids slip velocities in gas-solids up-risers are predicted.Calculation results are well consistent with experimental data. Furthermore, the effects of operating conditions on local slip velocities are discussed. It is concluded that local slip velocity increases with the increase of solids circulating rate and decreases with the increase of superficial gas velocity.

关 键 词：局部滑移速度 EMMS模型 提升管 床层空隙率 气固系统 

分 类 号：TQ022.4[化学工程]