Dust Emission Characteristics of Pulse-Jet-Cleaned Fabric Filters

Abstract

Essentially all dust penetration through a pulse-jet filter occurred by seepage of collected dust through the filter fabric rather than by a failure to collect the dust in the first place. The flux of dust through the fabric increased with time as the dust deposit on the fabric increased; this behavior is consistent with seepage theory. The flux of dust through pulse-jet cleaned bags was measured for dusts with three size distributions (granite dust, limestone dust, and fly ash), using polyester felt fabrics with three surface treatments (untreated surface, singed surface, and surface with microporous ptfe laminate), at three superficial filtration velocities (50, 75, and 100 mm/sec). Dust type and fabric type affected the amount of dust carried by the bag at steady state; the amount of dust carried determined the flux of dust through the fabric. Measurements of flux through the bags for all 27 tests correlated well with a single parameter, which was derived assuming seepage accounts for all penetrating dust.