the housing of the stratified bulk material filter contains several vertical bulk material layers which may be traversed transversely by crude gas flow , and are enflanked at both sides by delimitations and which may be supplied with particulate bulk material from above . a periodically occurring flushing - gas counterflow flushing operation is optionally combined with lateral and / or bottom bulk material extraction , whereby an adsorption of noxious gases and / or separation of particles from the crude gas is resolved advantageously by appropriate selection of the possible combination , in a simple structure .