Clogging of fibrous filters by solid aerosol particles - Experimental and modelling study
Clogging of fibrous filters by solid aerosol particles - Experimental and modelling study
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DOI：
10.1016/s0009-2509(01)00041-0
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发表时间：
2001-06-01
影响因子：
4.7
通讯作者：
Vendel, J
中科院分区：
文献类型：
--
作者：
Thomas, D;Penicot, P;Vendel, J
纤维过滤器是一种常见的清洁设备，通常用于从工业气流中去除颗粒。经常出现的主要问题涉及过滤器堵塞期间压降和过滤效率的演变。在本研究中，HEPA过滤器的负载特性进行了实验研究。测量压降和过滤效率的增加，并且与过滤床内部的渗透分布和由于扫描电子显微照片观察到的存款结构相关联。研究了风速、粒子大小、气溶胶浓度和过滤器主要特性等参数对过滤效果的影响。基于过滤器纤维和沉积颗粒之间的区别，开发了一种深度和表面过滤模型，从而在过滤器内部或过滤器表面上产生额外的纤维。我们可以注意到模型和实验之间有很好的一致性。此外，模型很好地描述了深度过滤和滤饼过滤之间的过渡区。从一种类型的过滤到另一种类型的过滤是一个连续的过程。模型还描述了穿透剖面的指数衰减。(C)2001爱思唯尔科技有限公司版权所有。
A fibrous filter is a common cleaning device often used to remove particles from industrial gas streams. The main question which often arises concerns the evolution of the pressure drop and the filtration efficiency during the filter clogging. In the present study, the loading characteristics of HEPA filters have been studied experimentally. The increase of pressure drop and filter efficiency was measured and was linked to both the penetration profile inside the filter bed and the deposit structure observed thanks to scanning electron micrograph. We have also studied the influence of various parameters such as air velocity, par-tide size, aerosol concentration and filter main characteristics. A depth and surface filtration model has been developed based on the distinction between the fibres of the filter and deposited particles resulting in additional fibres inside the filter or on the filter surface. We can notice a good agreement between model and experiment. Moreover, model very well describes the transition area between depth filtration and cake filtration. This transition from one type of filtration to another is a continuous process. Model describes also the exponential decrease of penetration profile. (C) 2001 Elsevier Science Ltd. All rights reserved.