Expanded grid static mixer
AssigneeSiemens Aktiengesellschaft
InventorsLothar Hofmann, Wieland Mathes, Udo Klumpp
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Abstract
A static mixer in the exhaust emission control system of an excess-air-operated combustion engine is formed of an expanded grid with a plurality of openings formed between crossbars. Using an expanded grid achieves both good mixing of the exhaust gas with a reducing agent in a short mixing path and properly aligns the exhaust flow.
Claims19
An exhaust system for an internal combustion engine having a catalytic converter for reducing pollutants in the exhaust gases from the engine in the presence of a reducing agent, the exhaust system comprising:
- an exhaust duct for carrying the exhaust gases from the engine to the catalytic converter, said exhaust duct having an injection location for the introduction of the reducing agent into the exhaust gases;
- and
- a static mixer disposed in said exhaust duct upstream of the catalytic converter and proximate to said injection location, said static mixer comprising an expanded grid in the form of a mesh having a plurality of openings formed between crossbars of said expanded grid.
An excess-air-operated internal combustion engine comprising:
- a catalytic converter for reducing pollutants in the exhaust gases from the engine in the presence of a reducing agent;
- an exhaust duct for carrying the exhaust gases from the engine to said catalytic converter;
- an injection device in said exhaust duct for introducing the reducing agent into the exhaust gases upstream of said catalytic converter;
- and
- a static mixer disposed in said exhaust duct upstream of said injection device, said static mixer comprising an expanded grid in the form of a mesh having a plurality of openings formed between crossbars of said expanded grid.
A method of mixing exhaust gases of an internal combustion engine with a reducing agent, the method comprising:
- providing a static mixer comprising an expanded grid in the form of a mesh having a plurality of openings formed between crossbars of said expanded grid;
- placing said static mixer in an exhaust duct of the engine proximate to an injection location for the introduction of the reducing agent into the exhaust gases.
Dependencies are inferred from the claim text.