Patent ID: 7033556

Claim:
A method of cleaning a dusty gas by removing fine particulate matter therefrom, comprising: a) arranging granular material in a panel of substantially vertically disposed beds, a transversely inclined porous plate supporting each said bed, each having a lower edge and an upper edge and presenting an inclined free face; b) providing passages that place each of said beds in communication with an elevated space containing said granular material and capable through action of gravity of supplying said material to said bed on demand; c) providing neighboring transverse nonporous plates above and below each said porous plate; d) forwardly flowing said dusty gas from a dusty-gas-distribution compartment nearby said lower edges and into each said bed across its free face, said free face cooperating with its neighboring superjacent nonporous plate to direct the flow of said dusty gas from said dusty-gas-distribution compartment and into said free face, said dust thereby being filtered from said gas and accumulating upon said free face to form a filter cake, cleaned gas leaving said bed across said inclined porous plate, said porous plate cooperating with its subjacent neighboring nonporous plate to direct said cleaned gas to flow toward a cleaned-gas-collection compartment; and e) thereafter creating en masse displacement of said granular material in each said bed respecting said bed's supporting plate, said displacement causing a moiety of said granular material along with said filter cake to spill from said bed's free face, and thereby creating demand for supply of said granular material via said passages to said bed.