Electrostatic filter for removing particles from diesel exhaust
AssigneeMAN Technologie GmbH
InventorsErnst-Michael Reichle, Wolfgang Bulang
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Abstract
In the case of an electrostatic diesel exhaust filter the corona electrode and the collecting electrode are supplied with direct voltage with an AC component so as to obtain and even discharge. A catalyst, preferably in a noble metal catalyst, may placed upstream from the electrostatic filter in the exhaust gas pipe so that the hydrocarbons also contained in the exhaust gas may be oxidized.
Claims7
Filtering apparatus for exhaust gas from a diesel engine comprising an electrostatic filter for removing particles from diesel exhaust gas comprising a corona electrode and a collecting electrode, and means for applying a high voltage to the filter in the form of a direct voltage and an alternating voltage superimposed thereon, and a catalyst arranged upstream from said electrostatic filter for oxidizing hydrocarbons, the diesel engine having an exhaust pipe, said catalyst being arranged in said exhaust pipe in proximity to said engine, said catalyst comprising a noble metal and being of such size that oxidation of sulfur dioxide in the gas is substantially avoided, said catalyst being dimensioned to provide high velocity exhaust gas therethrough to suppress oxidation of the sulfur dioxide in the exhaust gas and to provide flow of exhaust gas at least partly around said catalyst.
Dependencies are inferred from the claim text.