Effects of dust properties on gas cleaning using rigid ceramic filters

Abstract

Coupons of rigid ceramic filtration media have been conditioned using fine gasifier char and calcium carbonate dusts and both the cake resistance and the stress needed to detach the cake from the medium have been measured. For gasifier char, cake resistance appears to be independent of face velocity and proportional to areas cake loading, while cake removal stress is approximately independent of loading. For calcium carbonate, broadening the size distribution increases the cake resistance but slightly reduces the cake removal stress. Increases in particle size and cake void fraction decrease both cake resistance and cake removal stress. However, since increase in particle size seems often to be accompanied by decrease in cake void fraction, the range of commonly-observed cake resistivities and removal stresses is narrower than might otherwise be expected. © 1992