双层滤料过滤床的压降特性研究  

A Study of the Pressure-drop Characteristics of a Dual-layer Filter-material Filtering Bed

作　　者：杨国华[1] 周江华[1] 

机构地区：[1]宁波大学海运学院,浙江宁波315211

出　　处：《热能动力工程》2007年第3期267-269,共3页Journal of Engineering for Thermal Energy and Power

基　　金：宁波市博士基金资助项目(02J20101-19);浙江省科技计划重点基金资助项目(2006C23075)

摘　　要：介绍了双层滤料床的工作原理及其高过滤效率和低压降的过滤特性,试验测试了双层滤料过滤床的各层压降,分析了床层总压降、布风器、沙层和膨胀珍珠岩层的压降特性。结果表明,沙层压降占床层总压降的75%～90%,膨胀珍珠岩层压降占5%～22%。压降特性证明了沙层为表面过滤,膨胀珍珠岩层为深床过滤,这是双层滤料过滤床过滤效率高达99.99%,床层容尘量达到单层沙床10倍的原因所在。The working principle and high filtration efficiency of a dual-layer filter-material filtering bed are described along with its low pressure-drop filtration characteristics. The pressure drop at each layer of the above filtering bed was measured during tests. Analyzed were the total pressure drop of the bed layer and the pressure drop characteristics of a hot gas distributor, sand layer and an expanded perlite layer. The results show that the pressure drop of the sand layer accounts for 75%～90% and that of the expanded perlite layer for 5%～22% of the total pressure drop of the bed layer. The pressure-drop characteristics prove that the sand layer provides a surface filtration and the expanded perlite layer a deep bed one. This is the reason why a dual-layer filter-material filtering bed has a filtration efficiency of 99.99% and the bed layer a dust bearing capacity ten times as high as that of a single layer sand bed.

关 键 词：高温气体 过滤 颗粒层 双层滤料 

分 类 号：TK284.5[动力工程及工程热物理—动力机械及工程]