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Process-for-scrubbing-exhaust-gases-from-diesel-engines-and-filter-cartridge-for-carrying-out-the-process

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Process for scrubbing exhaust gases from diesel engines and filter cartridge for carrying out the process

Details

Inventors: Mizrah, Tiberiu; Kampfer, Konrad; Rieger, Wolfhart;
Assignee: Swiss Aluminium Ltd. (Chippis, CH)
Primary Examiner: Nozick; Bernard
Assistant Examiner:
Attorney, Agent or Firm: Bachman & LaPointe

A process for scrubbing exhaust gases from diesel engines using filter cartridges of open pore ceramic foam are such that the filter cartridges are situated in the exhaust gas stream such that the exhaust gases strike the filter cartridge end and flow through it parallel to its central axis. As a result the amount of soot deposited is greatest in the part of the cartridge first meeting the inflowing exhaust gases, and decreases rapidly with increasing throughput; consequently the low efficiency part contributes greatly to the undesired backpressure. The proposed process, in which the exhaust gases flow through the most efficient part of the filter cartridge made of open pore ceramic foam, is such that the exhaust gases flow essentially transverse to the longitudinal axis and thus does not exhibit these disadvantages. The filter cartridge comprise an open pore ceramic foam for carrying out the process of the invention and comprises a cylinder with cylindrical shaped opening the central axis of which coincides with that of the cylinder. The opening can be closed at one end.

DETAILED DESCRIPTION The foregoing object is achieved by way of the invention wherein the exhaust gases flow through the effective part of the filter cartridge essentially transverse to the longitudinal axis of the filter.
A filter cartridge of open pore ceramic foam for carrying out the process according to the invention is such that it is in the form of a cylinder and features a cylindrical shaped opening the axis of which is coincident with the axis of the cylinder.
A further filter cartridge according to the invention made of open pore ceramic foam and for carrying out the process according to the invention is such that it is in the form of a hollow cylinder closed at one end and comprising cylinder, base and cylindrical opening, the axis of which coincides with the axis of the cylinder.
The process according to the invention has the result that the cross-sectional area of filter across which the exhaust gas has to flow is increased over that in a filter in which the gas flows parallel to the central axis of the filter.
For a given flow of exhaust gas this leads to a reduction in the back pressure.
The open pore ceramic foam of a filter cartridge according to the invention occupies a larger volume than a conventional filter of open pore foam structure with the same porosity in which the exhaust gases flow parallel to the central axis with the same back pressure.
Consequently a filter cartridge according to the invention has the advantage of a larger soot capture capacity, which results in longer intervals between regeneration treatments.
Further advantages and details of the invention are revealed by way of the drawing and the following exemplified embodiments.

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