Hot gas filtration and heat exchange in a packed bed using Lapilli as a granular medium

被引:4
|
作者
Socorro, Miguel
Macias-Machin, Agustin
Verona, Jose M.
Santana, Domingo
机构
[1] Univ Carlos III Madrid, Dept Thermal & Fluids Engn, Energy Syst Engn Grp, ISE, Madrid 28911, Spain
[2] Univ Las Plamas Gran Canaria, ETSII Las Palmas, Energy & Environm Grp, EMA, Las Palmas Gran Canaria 35017, Canary Islands, Spain
关键词
D O I
10.1021/ie060354k
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
A study was conducted on gas filtration and heat exchange in a fixed-bed heat exchanger-filter (FHEF) where we have removed fine dust particles from gases and exchanged heat with the granular medium (Lapilli). The influence of a number of variables was examined including gas velocities, gas temperatures, concentration of dust, height of the FHEF, dust and granular mean size, and pressure drop. The collection efficiency was found to decrease with increasing temperature, and the pressure drop increases when the size of the granular medium decreases. A numerical model for gas filtration and heat exchange using the finite element method was developed. It predicts the two-dimensional transient response of both solid and fluid phases as well as the variation of the specific deposit and void fraction of the FHEF with time. The numerical model incorporates variation in void fraction, specific surface area of the medium, and transport coefficient because of the combined processes of filtration and heat exchange.
引用
收藏
页码:7957 / 7966
页数:10
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