Investigation of the Acceleration Region in a Gas-Solid Co-current Down-flow Circulating Fluidized Bed  

作　　者：李松庚 林伟刚 姚建中 

机构地区：[1]Multi-phase Reaction Lab, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China [2]Multi-phase Reaction Lab, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, Chinan this work, a mathematical model is established to describe the axial variation of the characteristic flow parameters (particle velocity, solid holdup and pressure gradient) in a downer. An empirical correlation is developed to estimate the particle velocity at the constant velocity section. Experimental investigations are made to validate the downer model. The model simulations have a good agreement with experimental data. Moreover, a formula is derived to predict the first acceleration section length and the whole acceleration section length.

出　　处：《Chinese Journal of Chemical Engineering》2004年第3期342-346,共5页中国化学工程学报（英文版）

基　　金：the National Program of Basic Research (No. G1999022103) ; the National Natural Science Foundation of China (No. 29936090).

摘　　要：In this work, a mathematical model is established to describe the axial variation of the characteristic flow parameters (particle velocity, solid holdup and pressure gradient) in a downer. An empirical correlation is developed to estimate the particle velocity at the constant velocity section. Experimental investigations are made to validate the downer model. The model simulations have a good agreement with experimental data. Moreover, a formula is derived to predict the first acceleration section length and the whole acceleration section length.In this work, a mathematical model is established to describe the axial variation of the characteristic flow parameters (particle velocity, solid holdup and pressure gradient) in a downer. An empirical correlation is developed to estimate the particle velocity at the constant velocity section. Experimental investigations are made to validate the downer model. The model simulations have a good agreement with experimental data. Moreover, a formula is derived to predict the first acceleration section length and the whole acceleration section length.

关 键 词：pressure gradient particle velocity solid holdup downer modeling acceleration region 

分 类 号：TQ05[化学工程]