William G Hardison

US Patent:

40544184, Oct 18, 1977

Filed:

Nov 10, 1975

Appl. No.:

5/630408

Inventors:

Steven T. Miller - Wilmington DE
William G. Hardison - Orangeburg SC

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

B01J 802
B01J 3504
F01N 310
F01N 315

US Classification:

23277C

Abstract:

An apparatus for the thermal-catalytic abatement of hydrocarbons, carbon monoxide, nitrogen oxides and particulates from effluent gas streams. The apparatus has a preheat section wherein the effluent is heated to 400. degree. -1000. degree. F by hot combustion gases. The effluent and combustion gases are directed by a baffle through a filter where combustible particulates are incinerated and noncombustible particulates are collected. The baffle followed by a diffuser cone, axially located on the filter, intimately mixes the effluent with the combustion gases so as to provide uniform flow and temperature distribution of the mixed gases across the filter. The filtered gases then pass through a catalytic reactor section containing a catalyst, preferably catalyst-coated ceramic honeycombs. In the presence of the catalysts the hydrocarbons and carbon monoxide in the heated gas stream are oxidized to carbon dioxide and water and the nitrogen oxides are reduced.