Abstract: A gas filter is disclosed including a clean gas section and a dusty gas section separated by a porting plate which includes concentric rings of ports providing gas communication between the two sections. The ports have connected thereto respective filter media sleeves for collecting contamination held in suspension in the gas being filtered. In order to clean the filter sleeves there is provided a back flushing gas pulse generator which is connected directly to a housing body of the filter apparatus. The gas pulse generator includes a release valve in direct communication with a hollow rotatable shaft which leads to a gas pulse distributor having arms which sweep across the clean gas section side of the porting plate. The arms of the gas pulse distributor includes apertures aligned with the respective ports of the porting plate so as to inject into the filter media sleeves a pulse of clean gas in a reversed direction so as to shake out any contaminants that have been collected in the sleeves.

Abstract: In a mechanical shake type fabric filter having a reciprocable shaker rack (10), a plurality of filter bag support caps (14) suspended from the shaker rack (10) and a fabric filter bag (11) suspended from each cap (14), the improvement that each cap (14) has a staple (16) formed on its upper surface which is releasably engaged with a hook (19) formed on the lower end of a support bar (17) which extends vertically through an aperture (18) in the shaker rack. The bar (17) may be retained in any vertical position relative to the shaker rack (10) by a spring clip (22) which is slidably positioned on the bar (17) but is deformed so as to frictionally engage the bar (17) when it contacts the shaker rack (10).The arrangement allows rapid adjustment of bag tension and simplified bag replacement.

Abstract: A gas cleaning installation, such as might be used to filter particulate material from exhaust gases of a power generating boiler or the like, which comprises a pair of gas cleaning chambers each containing filtration means for a gas stream passing through the installation. The chambers are spaced apart to define between them a gas inlet passage or passages into the underside of each chamber and, above, the inlet passage or passages a gas outlet passage or passages. The gas outlet passage or passages together include a portion extending at least part way across the upper end of each chamber, the outlet passage or passages communicating with each chamber through an aperture extending between the interior of the chamber and the interior of the respective portions of the gas outlet passage or passages.

Abstract: An air infiltration and mixing device for introducing cool air into a duct, such as an exhaust duct from a power generation boiler, carrying a gas at an elevated temperature comprising a first duct carrying the gas at an elevated temperature and a plurality of further ducts, of significantly smaller cross sectional area than the first duct, extending into the first duct through a side wall thereof in a direction transversely of the longitudinal axis of the first duct. Each further duct having an aperture at its end within the first duct and facing in a downstream direction, the other end of each of the further ducts having an opening adapted to communicate with a source of cool air.