Patent ID: 6451091
Filing Date: 2002-09-17
Classification: B01D

Abstract:
A method for continuous emission control of pollutants in a fluid stream using an apparatus comprising two or more parallel chambers enclosing a plurality of filter media in a unitary housing, the chambers having a common manifold inlet section and a common manifold outlet section within the housing, the method comprising:Providing divider walls within the housing to define the chambers in between the inlet and outlet manifold sections, and providing chamber inlet and outlet isolation dampers between the divider walls of the chambers; providing a source of reactive sorbent material for coating the plurality of filter media; terminating a flow of waste gas flow through one of the chambers by closing the chamber outlet isolation damper and cleaning the plurality of filters by providing a discharge opening for ash and spent sorbent through an inlet side of the filters; closing the chamber inlet isolation damper after the filters are cleaned and ash and spent sorbent are discharged; supplying a clean purging air from a connection separate from the inlet side of the filters; supplying a sorbent laden clean air supply having an elevated temperature for purging waste gas and dust while the outlet opening dampers are closed to prevent waste gas from flowing through the cleaned filter media, and depositing a coating of sorbent upon the surface of the plurality of filters; opening the chamber inlet isolation damper after the coating has been established to expose the coated filter media to waste gas flow while maintaining sorbent supply entrained in clean heated air; and terminating the clean air supply when the inlet dampers are fully opened.