Influence of air humidity on particle filtration performance of a pulse-jet bag filter

Abstract

A B S T R A C TA pulse-jet bag filter, representative of those implemented in waste incineration plants for flue gas treatment, was studied at laboratory scale to evaluate the influence of air humidity on the filtration performance. Several cycles of clogging/unclogging were performed with non-hygroscopic submicronic particles with a nanosized fraction with on-line cleaning at operating conditions as similar as possible to those found in the flue gas treatment of waste incineration plants (150°C -73 g/m 3 of absolute humidity), and in dry conditions (150°C).The results revealed a significant influence of air humidity on the bag filter performance: faster increase of bag filter pressure drop during clogging in presence of humidity due to water capillary condensation, lower efficiency of particulate cake unclogging and better collection efficiency of particles between 110 and 300 nm in diameter.

Study on Fugitive Dust Control Technologies of Agricultural Harvesting Machinery

“…Blocking at high humidity [68][69][70][71][72][73] Electrostatic precipitator Adsorption of charged dust particles by electrodes.…”

“…When the ambient humidity is too high, it has a certain impact on the performance of the bag filter. Boudhan[72] et al found that when the gas at the inlet contains water vapor, the capillary condensation of water makes the powder layer more compact, which accelerates the increase in the pressure difference and reduce the life of the filter bag. For a pulse bag filter, the performance of the air nozzles affects the dust removal effect.…”

An Experimental and Numerical Study on the Cleaning of Pleated Bag Filters Using Low-Pressure Pulsed-Jets

“…Steel, cement, mining and other industrial processes can produce a large amount of dust, and the problem of severe air pollution caused by dust emissions has attracted great attention [1][2][3]. Bag dust collector is commonly recognized as the most effective method to deal with particulates such as smoke and dust.…”

Effects of Surface Finish of Nonwoven Fabric Bag Filters on Filter Efficiency

“…In particular, the bag filter system is the most commonly applied in various industrial fields. For example, such systems have been installed in municipal garbage incineration facilities and coal-fired power plants [1][2][3][4][5][6], and their primary role is to exhibit enough mechanical strength to collect dust particles and withstand the related pressure drop. Therefore, the structure of bag filters, particularly those made of nonwoven fabric, consist of densely packed, relatively thick fibers [7,8].…”