DEVICE HAVING AN ANNULAR ELECTRODE FOR REDUCING SOOT PARTICLES IN THE EXHAUST GAS OF AN INTERNAL COMBUSTION ENGINE

摘要

The present invention relates to a device for reducing soot particles in an exhaust gas, in particular an exhaust gas of an internal combustion engine, having an outer tube (1) and an inner tube (2) which is arranged concentrically with respect to the former, which tubes form an intermediate space (3) through which the exhaust gas can flow, characterized in that at least one annular electrode (4) with a multiplicity of electrode tips (5) which protrude radially into the intermediate space is arranged on the inside of the outer tube (1), wherein there are terminals (6, 7) for connecting the annular electrode (4) and the inner tube (2) to a high voltage source (8) in order to form an electric field (E) in the intermediate space (3). At least two annular electrodes (4a, 4b) are preferably arranged axially behind one another at a respective electrode spacing (A), preferably of from 10 to 30 mm. The electrode tips (5) are, in particular, of approximately conical or pin-shaped configuration and have a radial length (L) of from 3 to 10 mm. In the case of each annular electrode (4), the electrode tips (5) are at a tip spacing (S) in the circumferential direction of from 3 to 20 mm, preferably of from 5 to 10 mm. In this way, a very effective and uniform radial electric field (E) can be generated for ionization.