Device and method for treating an exhaust gas containing particles
AssigneeContinental Automotive GmbH
InventorsChristian Vorsmann, Jan Hodgson
Life of this patent
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Abstract
A device for treating an exhaust gas containing particles includes: an exhaust gas line, an emission electrode and an electric supply line for the emission electrode. The electric supply line is at least partially surrounded by an electric insulator and the electric insulator has an outer diameter, the electric insulator extending from the exhaust gas line substantially in the direction of the longitudinal axis of the exhaust gas line. The outer diameter measures at most 20 mm in the terminal region towards the longitudinal axis.
Claims10
A device (1) for treating an exhaust gas containing particles, comprising:
- an exhaust gas line (6) having a longitudinal axis (13);
- an emission electrode (2);
- an electrical supply line (3) configured to supply electricity to the emission electrode (2);
- a counter electrode (7) arranged inside the exhaust gas line (6);
- an electrical insulator (4) arranged inside the exhaust gas line (6) and spaced apart, with respect to the longitudinal axis, from the counter electrode (7), the electrical insulator (4) having an external diameter (12), wherein the electrical supply line (3) is enclosed at least in sections by the electrical insulator (4),
- wherein the electrical insulator (4) extends from the exhaust gas line (6) toward the longitudinal axis (13) in a direction orthogonal to a direction of the longitudinal axis (13) of the exhaust gas line (6),
- wherein the external diameter (12) is at most 20 mm in an end region (14) of the electrical insulator (4) proximate the longitudinal axis (13), and
- wherein a section of the electrical supply line (3) inside the exhaust gas line (6) and not enclosed by the electrical insulator (4) is oriented in the direction of the longitudinal axis (13) so as to project towards the counter electrode (7) such that application of electrical potential to the emission electrode (2) via the electrical supply line (3) generates an electric field between the emission electrode (2) and the counter electrode (7).
A method for treating an exhaust gas containing particles, in which the exhaust gas flows past an emission electrode (2) in an exhaust gas line (6) and an electrical supply line (3) configured to contact of the emission electrode (2) is enclosed at least in sections by an electrical insulator (4) having a surface (5), wherein a counter electrode (7) is arranged inside the exhaust gas line (6) and a section of the electrical supply line (3) inside the exhaust gas line (6) and not enclosed by the electrical insulator (4) is oriented in the direction of a longitudinal axis (13) of the exhaust gas line (6) so as to project towards the counter electrode (7), the method comprising:
- a) applying a high voltage to the emission electrode (2) to generate an electric field between the emission electrode (2) and the counter electrode (7) and a corona discharge;
- b) causing the exhaust gas to flow against the surface (5) of the electrical insulator (4);
- c) depositing particles on the surface (5);
- and
- d) combusting the deposited particles on an area of the surface (5) at most 500 mm2 in size.
Dependencies are inferred from the claim text.