Ceramic filter, to separate particles from hot exhaust gas of coal-fired power station, has hollow coarse-pore ceramic body and fine-pore ceramic filter layer, which can be cleaned by pressure pulses

摘要

The ceramic filter for separation of particles from hot gas flows has a longitudinal hollow body (1) of a ceramic material with coarse pores and a ceramic filter layer (2) with fine pores. An end (3) of the body is secured to a carrier, with an inflow opening (5). The ceramic material of the body has a porosity which varies over the axial effective filtering length, either continuously or in a number of steps. The ceramic filter has a tubular body open at one end and closed at the other (4). The porosity of the ceramic material increases from the open end to the closed end of the hollow body. The open end of the body is widened (6) for mounting to a carrier. An Independent claim is included for the cleaning of the ceramic filter, where pressure pulses are applied to the filter layer against the flow direction of the filtrate or a pressure difference is neutralized, to remove deposits. The porosity of the ceramic material is set variably so that the filter layer is cleaned consistently, along its length, by the pressure pulses or the removal of any pressure difference and/or oscillations are reduced between the filter layer and the body.