CFB cyclones at high temperature:Operational results and design assessment

被引:3
作者
Raf Dewil
Jan Baeyens
Bart Caerts
机构
[1] University of Birmingham
[2] Campus De Nayer
[3] Katholieke Universiteit Leuven
[4] Birmingham B15 2TT
[5] Edgbaston
[6] Belgium
[7] United Kingdom
[8] B-3001 Heverlee
[9] Willem De Croylaan 46
[10] Department of Chemical Engineering Associated Faculty of Technology and Bio-sciences
[11] B-2860 Sint-Katelijne-Waver
[12] Jan De Nayerlaan 5
关键词
Cyclone; High loading; High temperature; Combustor;
D O I
暂无
中图分类号
TQ021 [基础理论];
学科分类号
081701 ; 081704 ;
摘要
Pressure drop and cut size measurements are reported for a full scale cyclone operating within a 58 MWth CFB-combustor unit at 775℃.The paper reviews the vast number of equations to calculate the pressure drop and separation efficiency of cyclones,generally for operation at ambient temperature and at low Cs <0.5 .None of the literature correlations predicts the pressure drop with a fair accuracy within the range of experimental operating conditions.The cut size d50 can be estimated using direct empirical methods or using the Stokes number,Stk50.Both methods were used to compare measured and predicted values of d50.With the exception of Muschelknautz and Krambrock,none of the equations made accurate predictions.Finally,an alternative method to determine the friction factor of the pressure drop equation(Euler number,Eu) and of the cut size is proposed.The Eu number is determined from the geometry of common cyclones,and the derived value of Stk50 defines more accurate cut sizes.The remaining discrepancy of less than 5%,when compared with the measured values,is tentatively explained in terms of a reduced cyclone diameter due to the solids layer formed near its wall.Further measurements,mostly using positron emission particle tracking,elucidate the particle motion in the cyclone and both tracking results and the influence of the particle movement on Eu and Stk50 will be discussed in a follow-up paper.
引用
收藏
页码:149 / 156
页数:8
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