Device and method for treating exhaust gas containing soot particles
A particle, carbon black technology, applied in the field of processing exhaust gas from diesel fuel, which can solve problems such as technical difficulties in continuous operation
Inactive Publication Date: 2012-06-13
EMITEC EMISSIONSTECHNIK
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Problems solved by technology
But this leads to the problem that it must be ensured that the nitrogen dioxide in the exhaust stream comes into contact with the deposited carbon black particles to a sufficient extent
[0007] In connection with this, there are also technical difficulties in the continuous operation of such exhaust systems in motor vehicles, in which different loads of the internal combustion engine lead to different exhaust gas flows, exhaust gas compositions and temperatures
Method used
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[0054] figure 1 A first embodiment of a device 1 according to the invention is shown. In this case, the exhaust gas flows in a flow direction 31 through an exhaust system, which is shown here as having an approximately tubular shape, although its shape is not critical. Carbon black particles 2 are contained in the exhaust gas. The exhaust gas with soot particles 2 is first led through a nitrogen dioxide source 3 , in particular through a platinum-coated honeycomb catalytic converter. The nitrogen dioxide source converts nitrogen monoxide (NO) contained in the exhaust gas into nitrogen dioxide (NO 2 ), thereby increasing the nitrogen dioxide content in the exhaust gas (in particular totaling at least 25% by weight or even at least 50% by weight of the total nitrogen oxides). The exhaust gas thus treated continues to flow to the surface separator(s) 6 . The surface separator 6 has an inlet region 8 and an outlet region 9 . Linear channels 7 extending parallel to one another...
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The invention relates to a method for converting soot particles (2) of an exhaust gas, comprising at least the following steps: (a) providing at least nitrogen dioxide or oxygen in the exhaust gas; (b) ionizing soot particles (2) by means of an electric field (16); (c) depositing electrically charged soot particles (4) on inner duct walls (17) of at least one surface collector (6); (d) bringing at least nitrogen dioxide or oxygen into contact with the deposited soot particles (2) on the inner duct walls (7) of the at least one surface collector (6). The invention further relates to a device suitable for carrying out the method, wherein at least one surface collector (6) is provided that has a plurality of ducts (7), through which the exhaust gas can flow and which extend between an inlet region (8) and an outlet region (9), wherein at least one deposit preventer (10) for electrically charged soot particles (2) is provided in at least part of the inlet region (8), thus especially allowing the soot particles to be evenly deposited and the surface collector to be continuously regenerated.
Description
technical field [0001] The invention relates to a device for treating exhaust gases containing soot particles, in particular having a so-called electrostatic filter or electrofilter, and to a suitable method for converting soot particles in exhaust gases. The invention is particularly suitable for the treatment of exhaust gases of mobile internal combustion engines in the automotive sector, especially for the treatment of exhaust gases originating from diesel fuel. Background technique [0002] Many different solutions for eliminating soot particles in exhaust gases from mobile internal combustion engines have been discussed. In addition to alternating closed wall-flow filters, open side-flow filters, gravity separators, etc., systems have also been proposed in which the particles in the exhaust gas are charged (charged) and then settled by means of electrostatic attraction. These systems are known inter alia under the designations "electrostatic filters" or "electrofilters...
Claims
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IPC IPC(8): B03C3/51B03C3/12B03C3/013F01N3/01F01N3/023B01D46/24B01D46/00
CPCB03C2201/12F01N3/01B03C2201/30F01N3/0231F01N2240/28F01N13/02B01D46/0032F01N3/106B03C3/12B03C3/383F01N13/009B01D46/24B03C3/51F01N3/05
Inventor W.莫斯P·希尔特R·布吕克
Owner EMITEC EMISSIONSTECHNIK