Exhaust-gas cleaning system with nitrogen oxide reduction and with the addition of reducing agent
AssigneesDaimlerChrysler AG, Dr. Ing. h.c.F. Porsche Aktiengesellschaft, Volkswagen Aktiengesellschaft, Audi AG, Bayerische Motoren Werke Aktiengesellschaft
InventorsChristian Goerigk, Stefan Wessels
Life of this patent
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Abstract
An exhaust-gas cleaning system includes a nitrogen oxide reduction catalytic converter for reducing nitrogen oxides which are contained in the exhaust gas. A reducing agent is introduced into the exhaust-gas flow and is in the form of a vapor. A reducing-agent metering device for the metered addition of the reducing agent or a reducing-agent precursor to the exhaust-gas flow includes a vaporizer, which is arranged in the exhaust system upstream of the nitrogen oxide reduction catalytic converter. As a heat source, the vaporizer has (1) a heatable deflector surface, onto which the reducing agent, which is supplied by a feed unit, is directed under pressure; or (2) a microwave generator.
Claims5
An exhaust-gas cleaning system, comprising:
- a nitrogen oxide reduction catalytic converter for reducing nitrogen oxides contained in an exhaust gas;
- and
- a reducing-agent metering device for metered addition of the reducing agent or a reducing-agent precursor to the exhaust gas,
- wherein said reducing-agent metering device comprises:
- a feed unit;
- a vaporizer arranged upstream of the nitrogen oxide reduction catalytic converter;
- and
- a heat source disposed in the exhaust gas, the heat source comprising a single baffle plate, the baffle plate being oriented with its planar faces parallel to a direction of flow of the exhaust gas,
- wherein the reducing agent is directed by the feed unit toward the single baffle plate under pressure at a substantially perpendicular angle onto one of the planar faces of the baffle plate.
Dependencies are inferred from the claim text.