Low-temperature plasma cooperating two-phase catalyzing device and harmful exhaust gas processing method

Abstract

The invention discloses a low-temperature plasma cooperating two-phase catalyzing device and a harmful exhaust gas processing method, belonging to the technical field of purification of harmful exhaust gas from a diesel engine. The device provided by the invention comprises a main air inlet (1), an oxide phase catalyzing device (2), an air outlet A (3), a support A (4), a plasma generator (6), a support B (8), an air inlet B (9), a reduction phase catalyzing device (10) and a main air outlet (11). The method provided by the invention comprises the following steps of: firstly, catalyzing the oxide phase of the harmful exhaust gas through the oxide phase catalyzing device (2); secondly, dividing the gas into three or more than three flows, respectively introducing the gas flows into a double-dielectric-barrier-discharge low-temperature plasma generator to perform low-temperature plasma dielectric barrier discharge on the gas; and finally, catalyzing the reduction phase of the gas through the reduction phase catalyzing device. In the invention, two-phase catalyzing devices are combined, the conversion efficiency of the exhaust gas is further increased, and the harmful emission of thediesel engine is reduced.

Description

technical field [0001] The invention relates to the technical field of purification treatment of harmful exhaust gas from diesel engines. Background technique [0002] At present, the low-temperature plasma generator structure used in the field of aftertreatment of diesel engine emissions consists of a plasma power supply, an equivalent capacitor, a high-voltage electrode, a dielectric layer and a low-voltage electrode. Connect the high-voltage electrode to the plasma variable frequency AC power supply, the low-voltage electrode to ground, and place the dielectric material between the two electrodes, so that a uniform and stable dielectric barrier discharge will appear along the surface of the dielectric in the gap between the two electrodes. The dielectric barrier discharge method requires a high degree of ionization, sufficient energy density in the gas phase region, and a long residence time for gas components in the plasma gas phase region to treat harmful emissions from...

AI Technical Summary

Problems solved by technology

This technology can ensure the safe and reliable operation of the low-temperature plasma generator in the diesel engine exhaust bench test and research work, and has good shock resistance, but the residence time of the gas components in the plasma gas phase reaction zone is relatively short, and the chemical reaction is not very sufficient.

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