Saleem Mahmood, Krammer Gernot, Khan Rafi Ullah, Tahir M Suleman
Institute of Chemical Engineering and Technology, University of the Punjab, Quaid-i-Azam Campus, 54590- Lahore, Pakistan ; Graz University of Technology, Graz, Austria.
Graz University of Technology, Graz, Austria.
Powder Technol. 2012 Jul;224(1-2):28-35. doi: 10.1016/j.powtec.2012.02.016.
Bag filters are commonly used for fine particles removal in off-gas purification. There dust laden gas pervades through permeable filter media starting at a lower pressure drop limit leaving dust (called filter cake) on the filter media. The filter cakeformation is influenced by many factors including filtration velocity, dust concentration, pressure drop limits, and filter media resistance. Effect of the stated parameters is investigated experimentally in a pilot scale pulse-jet bag filter test facility where lime stone dust is separated from air at ambient conditions. Results reveal that filtration velocity significantly affects filter pressure drop as well as cake properties; cake density and specific cake resistance. Cake density is slightly affected by dust concentration. Specific resistance of filter cake increases with velocity, slightly affected by dust concentration, changes inversely with the upper pressure drop limit and decreases over a prolonged use (aging). Specific resistance of filter media is independent of upper pressure drop limit and increases linearly over a prolonged use.
袋式过滤器通常用于废气净化中去除细颗粒。含尘气体从较低的压降极限开始渗透过可渗透的过滤介质，将灰尘（称为滤饼）留在过滤介质上。滤饼的形成受许多因素影响，包括过滤速度、粉尘浓度、压降极限和过滤介质阻力。在中试规模的脉冲喷吹袋式过滤器试验装置中，对上述参数的影响进行了实验研究，该装置在环境条件下从空气中分离石灰石粉尘。结果表明，过滤速度显著影响过滤压降以及滤饼特性；滤饼密度和比滤饼阻力。滤饼密度受粉尘浓度的影响较小。滤饼的比阻力随速度增加，受粉尘浓度影响较小，与上限压降极限成反比，并在长期使用（老化）过程中降低。过滤介质的比阻力与上限压降极限无关，并在长期使用过程中呈线性增加。
