Vehicle SCR (selective catalytic reduction) system and exhaust gas heat-insulating and mixing device thereof
A hybrid device, SCR catalyst technology, applied in the exhaust device, muffler device, exhaust treatment and other directions, can solve the problem of low catalytic reduction efficiency, reduce wall deposition problems, smooth gas flow, and improve catalytic efficiency. Effect
Active Publication Date: 2018-12-11
HENAN UNIV OF SCI & TECH
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Problems solved by technology
[0007] The purpose of the present invention is to provide an exhaust gas heat preservation and mixing device, which is used to solve the technical problem of low catalytic reduction efficiency of the SCR system in the prior art
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specific Embodiment 1
[0034] Such as Figure 1~3 As shown, the vehicle SCR system includes a urea injection device 2, an SCR catalyst 9 and an exhaust gas insulation mixing device installed between the two. The urea injection device 2 is fixed on the exhaust pipe 1 of the vehicle, the exhaust gas insulation mixing device is connected with the nozzle of the exhaust pipe 1, and the SCR catalyst 9 is connected with the outlet of the exhaust gas insulation mixing device. The urea injection device 2 injects a certain amount of urea aqueous solution under the control of the urea injection control unit. The sprayed urea aqueous solution generates ammonia gas through the evaporation of water vapor and the pyrolysis and hydrolysis of urea. The generated ammonia gas flows through the exhaust gas insulation mixing device It is fully mixed with the exhaust gas of the vehicle engine, and the mixed ammonia gas and the nitrogen oxide in the exhaust gas undergo a catalytic reduction reaction in the SCR catalyst 9 t...
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The invention relates to a vehicle SCR (selective catalytic reduction) system and an exhaust gas heat-insulating and mixing device thereof. The vehicle SCR system comprises a urea spraying device, anSCR catalyst and the exhaust gas heat-insulating and mixing device. The exhaust gas heat-insulating and mixing device comprises an outer cylinder and an inner cylinder, the front end of the outer cylinder is connected with a vehicle exhaust pipe, the rear end of the outer cylinder is connected with the front end of the SCR catalyst, and the inner cylinder is made of a heat-conductive material. A mixing channel for allowing mixed gases, obtained by mixing exhaust gases and sprayed urea aqueous solutions, to circulate is formed by an inner cavity of the inner cylinder. A heat-insulating channelfor allowing heat-insulating exhaust gases to circulate is formed by an annulus space between the inner cylinder and the outer cylinder. A Venturi mixing section for sufficiently mixing the mixed gases with the heat-insulating exhaust gases is arranged at the outlet end of the inner cylinder. The vehicle SCR system has the advantages that through the structural design of the inner cylinder and theouter cylinder, the mixed gases in the inner cylinder are subjected to heat insulation by the heat-insulating exhaust gases in the heat-insulating channel, so that the mixed gases flowing into the SCR catalyst have high temperatures and mixing uniformity, and the catalytic efficiency is improved.
Description
Technical field [0001] The invention relates to the technical field of vehicle exhaust gas treatment, in particular to a vehicle SCR system and an exhaust gas heat preservation mixing device. Background technique [0002] Engines can be divided into diesel engines and gasoline engines according to the different fuels they burn. Because both diesel and gasoline engines need to burn fossil fuels to generate power, the combustion of fossil fuels is accompanied by the production of gaseous pollutants. Take the diesel engine as an example. The exhaust gas produced by the diesel engine mainly contains nitrogen oxides and particulate matter. Because the diesel engine is oxygen-enriched combustion, the two have a trade-off relationship. It is impossible to reduce the two pollutants at the same time through the method of internal purification. emission. At present, a more mature treatment method is to reduce the original particulate emissions of diesel engines by using high-pressure fuel...
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Patent Timeline
Login to View More IPC IPC(8): F01N3/20F01N3/28F01N13/14
CPCF01N3/2066F01N3/2892F01N13/14F01N2610/02F01N2610/1453Y02T10/12Y02A50/20
Inventor 吴凤英徐斌王站成刘建新李民杜慧勇韩铭
Owner HENAN UNIV OF SCI & TECH