化工进展2017，Vol.36Issue(z1)：180-186,7.DOI:10.16085/j.issn.1000-6613.2016-2290
流化床内粉煤气固流动特性的实验研究
Experimental study on flow characteristics of gas-solid of powdered coal in a fluidized-bed
屠功毅 1宗弘元 1钟思青 1徐俊 1周靖 1辛忠2
作者信息
- 1. 中国石油化工股份有限公司上海石油化工研究院,上海201208
- 2. 华东理工大学化工学院,上海200237
- 折叠
摘要
Abstract
The flow regimes and pressure fluctuations of powdered coal gas-solid two-phase flow in a fluidized-bed are experimentally studied by using five different particle size distributions of powdered coal.The flow patterns under different operating parameters are determined.The effects of different operating conditions on the pressure distribution and the pressure fluctuation are investigated.The critical fluidization velocity was analyzed by a new method,which is based on the curve of the pressure difference between two adj acent points at the bottom of the fluidized-bed.The initial turbulent fluidization velocity is determined by the fluidization velocity of the maximum value of the pressure standard deviation.The relation formulas between the Reynolds numbers of the critical fluidization and the initial turbulent fluidization on the particle size of powdered coal are proposed.The internal relation between the pressure variations and the evolution of the flow regimes is revealed.The results show that the smaller particle size of powdered coal is,the smaller critical velocity of each flow regime is.When slugging fluidization or turbulent fluidization occurs in fluidized-bed,the pressure fluctuation of fine powdered coal is slight,while the pressure fluctuation of coarse powdered coal is severe.The pressure difference between two adj acent points and pressure standard deviation at the bottom of the fluidized-bed increase first and then decrease with the increase of fluidization velocity.关键词
流化床/流态化/流域/粉体/流体动力学Key words
fluidized-bed/fluidization/flow regime/powders/hydrodynamics分类
化学化工引用本文复制引用
屠功毅,宗弘元,钟思青,徐俊,周靖,辛忠..流化床内粉煤气固流动特性的实验研究[J].化工进展,2017,36(z1):180-186,7.
