Exhaust emission control device for diesel engines
AssigneeKomatsu Ltd.
InventorKoutaro Wakamoto
Life of this patent
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Abstract
The present invention is an exhaust emission control device for a diesel engine that is small and simple, and can efficiently reduce and eliminate NO.sub.x in exhaust gas. To this end, the device includes a reforming catalyst (12) for reforming either a mixture of diesel fuel and water, or a mixture of diesel fuel, water, and air to an oxygen-containing compound and for supplying the same into an exhaust pipe (2); and a NO.sub.x catalyst (3) is disposed in the exhaust pipe (2), at a position downstream from the supplying position, for reducing and controlling NO.sub.x in the exhaust gas from the diesel engine.
Claims50
An exhaust emission control device for a diesel engine having an exhaust pipe, said exhaust emission control device comprising:
- a fuel tank for containing diesel fuel;
- a water tank for containing water;
- a reforming catalyst for reforming diesel fuel to at least one reducing agent, said reforming catalyst being a reforming catalyst which reforms a mixture of diesel fuel and water to at least one oxygen-containing reducing agent;
- pipings for supplying diesel fuel from said fuel tank and water from said water tank to said reforming catalyst and for supplying resulting reducing agents into exhaust gas in said exhaust pipe at a supplying position;
- and
- a NO.sub.x catalyst which is disposed in said exhaust pipe at a position downstream from said supplying position, and which reduces and controls NO.sub.x in exhaust gas from the diesel engine.
An exhaust emission control device for a diesel engine having an exhaust pipe, said exhaust emission control device comprising:
- a fuel tank for containing diesel fuel;
- a water tank for containing water;
- a source of pressurized air;
- a reforming catalyst for reforming diesel fuel to reducing agents, said reforming catalyst being a reforming catalyst which reforms either a mixture of diesel fuel and water or a mixture of diesel fuel, water, and air to at least one oxygen-containing reducing agent;
- pipings for supplying to said reforming catalyst diesel fuel from said fuel tank, water from said water tank, and pressurized air from said source of pressurized air, and for supplying resulting reducing agents into said exhaust pipe at a supplying position;
- and
- a NO.sub.x catalyst which is disposed in said exhaust pipe at a position downstream from said supplying position, and which reduces and controls NO.sub.x in exhaust gas from the diesel engine.
Dependencies are inferred from the claim text.