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Initial Results With the Electrostatic Soot Separator on a Passenger-Car Diesel Engine
Sector:
Language:
German
Abstract
The electrostatic soot filter consists of an electrostatic field
and a downstream cyclone. The usually very small soot particles are
separated in the field and converted into considerably larger
particles. In the cyclone, the soot is separated and the exhaust
stream is divided into two streams, whereby the first, as a clean
gas stream, should contain no soot particles and the other stream
should contain all the soot particles. Whereas the clean gas stream
can leave the vehicle by way of the exhaust pipe, the exhaust gas
stream containing soot is recirculated into the intake manifold of
the engine. The engine burns the soot with high conversion rates,
so that particle emission improvements of 80% can be achieved in
steady-state operation. In the CVS test the emission of particles
is reduced by 50% with a first test sample.
Due to the continuous operation of the filter and the burning of
the soot in the engine, the particularly critical problem of
regeneration does not apply in this case. The danger of clogging
can virtually be ruled out even if the filter is fitted at a
considerable distance from the engine. This loss in pressure
corresponds to that of a silencer. A drawback is the still
comparatively large size (approximately 1 1/2 times the volume of a
rear silencer).