HIGHLY EFFECTIVE NON-CLOGGING FILTER UNIT

摘要

According to the invention, the exhaust gas of a diesel engine is directed via at least two serially arranged filter units (I, II) in order to eliminate soot from the exhaust gas. Each filter unit comprises a filter element with a parallel connection (4) which the exhaust gas can penetrate without being filtered. The parallel connections (4, 5) of two successive filter elements are joined to each other by means of a direct, non-clogging flow path. The parallel connections (4, 5) of the successive filter elements (2, 3) are flowingly disposed relative to each other such that the exhaust gas is largely prevented from penetrating directly from one parallel connection into the parallel connection of the successive filter unit, thus ensuring a great total filter efficiency while the counterpressure of the exhaust gas is comparable to conventional filter systems in spite of the parallel connections (4, 5) in the individual filter units. The parallel connections in the filter units ensure emergency operation at a still admissible counterpressure of the exhaust gas in case active or passive filter regeneration fails.