Abstract: In order to meet the latest national ultra-low emission standards, effective management of industrial dust is the key to achieving the goal. This study establishes an experimental test system for filter materials to investigate the influence of dust concentration and dust moisture content on the dust cake formation characteristics and filtration performance of coated filter media by analyzing the pressure drop, filtration efficiency, dust deposition per unit area, the thickness of dust cake and the standard deviation of thickness. The results show that with the extension of the filtration time, the thickness and inhomogeneity of the dust cake gradually increased from the top to the bottom in the vertical direction, however, the unevenness of the dust cake thickness stabilized after a period of time. With the increase of dust concentration, the thickness and inhomogeneity of the dust cake gradually increase. When the dust concentration is low, the overall increase in the thickness of the dust cake from the top to the bottom is slow, and the thickness difference is small. When the dust concentration is high, the thickness of the top of the dust cake increases slowly and the thickness of the bottom increases rapidly. With the increase of dust concentration, the pressure and the dust deposition per unit area increase, the filtration efficiency is around 99.9%, and the porosity gradually decreases overall. With the increase of dust moisture content, the uniformly of dust cake varies significantly, the dust cake uniformity is poor when the dust moisture content is 9% and 13%, and the distribution of dust cake is relatively uniform when the dust moisture content is 10%~12%. The effect of dust moisture content on the filtration performance is mainly reflected in the change of pressure drop, and the increase of dust moisture content helps to reduce the pressure drop of the dust cake, and the effect on the filtration efficiency is not significant.

Key words: dust concentration, dust moisture content, dust cake characteristics, filtration performance

摘要： 本工作搭建了滤料实验测试台，通过分析覆膜滤料的压降、过滤效率、单位面积粉尘沉积量、滤饼厚度和厚度标准差探究粉尘浓度和粉尘含水率对覆膜滤料滤饼形成特性及过滤性能的影响。结果表明，随过滤时间延长，滤饼垂直方向上从顶部到底部厚度及其不均匀性逐渐增大，但经过一段时间后滤饼厚度不均匀性趋于稳定。随粉尘浓度增加，滤饼厚度和不均匀性逐渐增大；粉尘浓度较低时，滤饼厚度从顶部到底部整体增加缓慢，厚度差异较小；粉尘浓度较高时，滤饼顶部厚度增加较慢，底部厚度增加较快；随粉尘浓度增加，压降和单位面积粉尘沉积量增加，过滤效率约为99.9%，孔隙率整体逐渐减小。随粉尘含水率增加，滤饼均匀性差异明显，粉尘含水率为9%和13%时滤饼均匀性较差，粉尘含水率为10%~12%时，滤饼分布相对均匀。粉尘含水率对过滤性能的影响主要体现在压降的变化，含水率增加有助于减小滤饼压降，对过滤效率的影响并不明显。

关键词: 粉尘浓度, 粉尘含水率, 滤饼特性, 过滤性能