文献类型：期刊文献

中文题名：气固流化床固体浓度分布的冷模研究

英文题名：Solid Concentration Distribution in a Gas-Solid Fluidized Bed

作者：蔡进[1];李涛[1];孙启文[2];应卫勇[1];房鼎业[1]

机构：[1]大型工业反应器工程教育部工程研究中心华东理工大学化学工程国家重点实验室,上海200237;[2]上海兖矿能源科技研发有限公司,上海201203

年份：2008

卷号：8

期号：5

起止页码：839

中文期刊名：过程工程学报

外文期刊名：The Chinese Journal of Process Engineering

收录：CSTPCD;;EI(收录号：20084711718507);Scopus;北大核心:【北大核心2004】；CSCD:【CSCD2011_2012】；

基金：博士学科点专项科研基金资助项目(编号:20050251006)

语种：中文

中文关键词：固体浓度;气固流化床;分布器;静床高;开孔率

外文关键词：solid concentration; gas-solid fluidized bed; distributor; initial bed height; porosity

摘要：在内径0.284m、高6.0m的气固流化床冷模装置中进行了气固流化实验,采用PC6D型颗粒浓度测试仪检测固体浓度.分别采用枝条型(开孔率α=5‰和2.5‰)和环形(α=5‰)气体分布器,以直径154～180μm、密度2550kg/m3的砂子为颗粒,在静床高H0=0.6～1.5m、表观气速u=0.3～0.6m/s的情况下,考察了时均固体浓度1-ε在空间的分布.结果表明,增加u使密相区的1-ε减小,分布器形状对1-ε影响不大.采用较低α的分布器时1-ε的变化较大,且其值均较低.H0=0.6m,轴向位置H=0.4m,u=0.3m/s,径向位置r=0～0.142m时,1-ε由0.410上升到0.494;H0=0.6m,H=0.4～0.95m,u=0.3m/s,r=0时,1-ε从0.410减小到0;H0=1.5m,H=0.4～1.3m,u=0.3m/s,r=0时,1-ε从0.397先下降到0.372,再上升到0.424,最后下降到0.328.
The experiments were conducted in a cold conventional fluidized bed using fiber optical probe as the detecting apparatus. The system compromises a replaceable gas distributor in a 0.284 m internal diameter acrylic column, a compressor, a series of knock-out drum, a freezer dryer, a rotameter, a fiber optic probe system and a series of cyclone. The experiments were carried out at ambient conditions and under different superficial gas velocities ranging from 0.3 to 0.5 m/s and different initial bed height ranging from 0.6 to 1.5 m using air as the fluidizing gas. A mixture of sands ranging from 154 to 180 I.tm diameter and average density of 2 550 kg/m^3 were used as the fluidizing particles. The effects of radial distance, axial distance, superficial gas velocity, initial bed height, porosity and shape of distributor on solid concentration in the bed were examined. The experimental results show that the time-averaged solid concentration increases in the dense phase area with the increase of superficial gas velocity. The shape of distributor does not exert much influence on the solid concentration while the smaller porosity of distributor gives rise to a lower and steeper solid concentration distribution. The initial bed height influences the solid concentration distribution contours significantly.