Waste incinerator exhaust gas treatment and apparatus

Claim 1

A waste incinerator comprising: means defining a combustion chamber; means defining an exhaust gas passageway in communication with said combustion chamber and having a flow therethrough away from said combustion chamber of exhaust gases generated by combustion in said combustion chamber; filter means disposed in said exhaust gas passageway for separating particulate material from said exhaust gas flow, said filter means having an input side and an output side, said output side having a gas pressure lower than the gas pressure of said input side; filter elements disposed within said filter means and having filter surfaces formed thereon, said filter surfaces being adapted to receive deposits of said particulate material thereon, at least some of said filter surfaces being nonplanar and being so oriented that exhaust gases passing over said some of said filter surfaces are subject to sudden directional changes in a regular manner resulting in turbulence intensifying pulsations; spray nozzle means disposed adjacent said input side of said filter means for introducing into said exhaust gas flow a dry, finely divided scrubbing agent for removing constituents of said exhaust gas flow, said scrubbing agent being distributed onto said filter surfaces to form a coating thereon; and means defining a second passageway providing gaseous communication between said spray nozzle means and said exhaust gas passageway at a point prior to said input side of said filter, said second passageway defining means branching off a portion of said exhaust gas flow and conducting said portion of said exhaust gas flow to said spray nozzle means to supply a gaseous vehicle for propelling said scrubbing agent through said spray nozzle means and onto said filter surfaces.