Abstract Exhaust emission control device for an internal combustion engine comprising a chamber for removing oxides of nitrogen having mounted therein at least one catalyst element for removing oxides of nitrogen, at least one exhaust gas intake manifold connecting said chamber for removing oxides of nitrogen with an exhaust gas outlet port of the internal combustion engine, and a recombustion chamber of an afterburner formed in said chamber for removing oxides of nitrogen and provided with an exhaust gas outlet line. Said device further comprises an exhaust gas inlet port formed in a shell of said recombustion chamber for maintaining communication between said chamber for removing oxides of nitrogen and said recombustion chamber, and a vortical flame producing chamber of the afterburner connected to a side of said recombustion chamber at which said exhaust gas inlet port is formed.
A device as defined in claim 1 wherein the catalyst elements for removing oxides of nitrogen are mounted radially in suitably spaced-apart relationship.
Claim 2
Dependent Claim
50 words
A device as defined in claim 1 wherein the catalyst elements for removing oxides of nitrogen are of rectangular plate shape and made of precious metal, said catalyst elements being mounted radially in suitable spaced-apart relationship with their longitudinal side being parallel to the center axis of said recombustion chamber.
Claim 3
Dependent Claim
51 words
A device as defined in claim 1 wherein the catalyst elements for removing nitrogen are of disk shape and formed with a number of small apertures, said catalyst elements being radially mounted in suitable spaced-apart relationship with their radius being at right angles to the center axis of said recombustion chamber.
Claim 4
Dependent Claim
28 words
A device as defined in claim 1 wherein the catalyst elements for removing oxides of nitrogen is of honeycomb structure, said catalyst element substantially filling said first chamber.
Claim 5
Dependent Claim
60 words
A device as defined in claim 1 wherein a plurality of catalyst elements for removing oxides of nitrogen of honeycomB structure are provided, said catalyst elements being equal in number to the exhaust gas intake manifolds and disposed in said first chamber so as to remove oxides of nitrogen from exhaust gases of the internal combustion engine at high efficiency.