Injection device for the treatment of exhaust fumes from motor vehicles

Abstract

A device for injecting at intermittent periods a dispersion of a liquid at controlled pulsing periods into exhaust fumes of a combustion engine, said liquid contains a component which reacts with a component of the exhaust fumes at a catalytic converter, said device comprises a housing containing a first chamber a means for supplying the liquid into a first chamber a means for pumping the liquid from the first chamber into a pressure swirl atomizer where the liquid is dispersed, said swirl atomizer comprising an outlet nozzle leading the dispersion into an exhaust manifold through which the exhaust fumes are directed prior to being converted at the catalytic converter, said device further comprises a means for controlling the means for pumping such that a pulsing period during which the liquid is injected into the swirl atomizer is controlled to be from about 1 to about 1000 milliseconds as well as a method for injecting a dispersion of a liquid into exhaust fumes of combustion engines.

Description

technical field

[0001] The invention relates to an injection device for injecting an atomized active component into exhaust gas, in particular from an internal combustion engine, especially a diesel engine, for the catalytic reduction of harmful components in the exhaust gas, in particular nitrogen oxides. Background technique

[0002] There is an increasing demand for a significant reduction of nitrogen oxide emissions from internal combustion engines, especially diesel internal combustion engines, in motor vehicles such as trucks, buses and motorcycles. The nitrogen oxide content in the exhaust gas can be reduced by selective catalytic reduction (SCR), in which the exhaust gas is guided into a catalytic converter together with an aqueous urea solution. At this converter, the catalytic nitrogen oxides react with the urea solution to reduce the toxic compound. For the most efficient conversion, fine atomization of the aqueous urea solution in the exhaust gas is required. T...

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