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Device for cleaning exhaust gases
| Details |
Inventors: Fleck, Carl M.;
Assignee:
Primary Examiner: Hart; Douglas
Assistant Examiner:
Attorney, Agent or Firm: Collard & Roe
A device and process for cleaning exhaust gases, in particular those from diesel engines, in which the exhaust gases are taken through a channel (36a) of a ceramic body (36) where an electric field is generated substantially transversely to the direction of flow, whereby the soot particles deposited on the walls of the channel (36a) are oxidized by free ions or ions adhering to oxygen. |
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DETAILED DESCRIPTION I claim: 1.
A device for cleaning exhaust gases comprising a ceramic body having rows of walls extending in the direction of a longitudinal axis, opposing ones of the walls and additional longitudinally extending walls defining channels through which the exhaust gases can flow, and electrodes for generating an electric field penetrating the ceramic body and passing through the channels, the electrodes being orientated longitudinally to the longitudinal direction of the channels, the field strength of the electric field in the channels being between 100 and 1000 V/mm, and a characteristic number E, which takes into account the geometry of the cross section of the channels and the specific electric resistance of the material of the ceramic body and which is equivalent to the following relation ##EQU10## being at least 10.
sup.
7 .
OMEGA.
, wherein .
rho.
constitutes the specific electric resistance of the ceramic material at 600.
degree.
C.
in .
OMEGA.
cm, .
beta.
constitutes a geometric form factor and d is the width or thickness of the walls separating the channels, the geometric form factor .
beta.
being a result of the following relation: ##EQU11## wherein l is the average length of the current path formed in the ceramic material between the electrodes and x is the distance between the electrodes measured in the direction of the electric field.
2.
The device of claim 1, wherein the electric field is between 200 and 500 V/mm.
3.
The device of claim 1, wherein E is at least 10.
sup.
8 .
OMEGA.
.
4.
The device of claim 1 and adapted to separate soot particles from diesel exhaust gases, wherein the electrodes are high-voltage electrodes arranged parallel to and facing each other, and the additional walls are inclined with respect to the opposing walls in opposite directions and are connected to each other at points of connection, whereby the additional walls extend zigzag-like in a direction extending transversely to the longitudinal axis, the channels being open at their ends, and the distance between opposing ones of the points of connection determining a maximum height of the channels in the direction of the electric field, whereby the electric field strength is within a magnitude of 10 to 20 kV/cm at room temperature
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Manufacturing Materials 
