Back-shaped mixing device and post-processing system
A mixing device and back-shaped technology, which is applied in the direction of exhaust treatment, exhaust device, noise reduction device, etc., can solve the problems of increasing the risk of urea crystallization, long space for mixing tail gas and urea, and limited installation space
Active Publication Date: 2022-07-15
WUXI WEIFU LIDA CATALYTIC CONVERTER
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Problems solved by technology
[0004] In conventional SCR equipment, in order to ensure the mixing effect of urea solution and exhaust gas, the mixing space of exhaust gas and urea is relatively long. This design requires a large installation space on the one hand, and increases the risk of urea crystallization on the other hand.
[0005] Especially in the exhaust gas treatment system of heavy-duty commercial vehicles, in order to meet the purification effect, it is necessary to install a catalyst carrier with a large size, but the installation space for the treatment system in the vehicle is limited, so there is a need to increase the mixing effect of urea. Paradox of distance
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[0058] In other embodiments, the urea nozzle 1 may also be arranged on the housing 10 or even on the intake deflector 30 . The application does not limit the installation position and installation method of the urea nozzle 1 .
[0059] To sum up, by arranging the intake air guide plate 30 and the air outlet guide plate 40 and forming a guide ring, a U-shaped mixing channel can be formed in the housing 10 . It can be known that when the length of the inner space of the housing 10 along the first direction is a, the mixing channel is set to be U-shaped, so that the total length of the mixing channel is not less than 2a. That is to say, the design of the guide ring can effectively extend the flow distance of the gas without increasing the space. At the same time, when the gas flows through the air inlet guide plate 30 and toward the air outlet guide plate 40, the movement direction of the gas changes. After the gas changes direction, a swirling flow can be formed. Mixing of ure...
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The application discloses a back-shaped mixing device, comprising a casing, a fixing plate, an air inlet guide plate and an air outlet guide plate, the fixing plate is used to seal the casing, and the fixing plate is provided with an air inlet and an air outlet; The air inlet guide plate and the air outlet guide plate are arranged in the casing and form a guide ring; the gas enters the casing through the air inlet, passes through the guide ring, and is discharged from the air outlet; the guide ring makes the inside of the casing The space forms a U-shaped mixing channel, which extends the flow distance of the gas without increasing the space, and can also change the movement direction of the gas to promote the gas swirl and the mixing of the gas and the urea solution. The application also discloses a post-processing system, which includes the above-mentioned zigzag mixing device, and also includes a baffle, which is connected to the first cylinder, the mixing device and the second cylinder, and has the advantages of simple structure, small occupied space and the effect of purifying exhaust gas. it is good.
Description
technical field [0001] The application relates to the technical field of automobile exhaust gas treatment equipment, in particular to a back-shaped mixing device and a post-processing system. Background technique [0002] Automobile exhaust contains harmful gases such as CO (carbon monoxide), HC (hydrocarbons) and NOx (nitrogen oxides). In order to protect the environment and human body, it is necessary to purify automobile exhaust. [0003] Selective Catalytic Reduction (SCR) is a treatment process for NOx in vehicle exhaust. Specifically, after the exhaust gas enters the SCR device, the reducing agent ammonia or urea is injected into it, and under the action of the catalyst, NOx is reduced to nitrogen and oxygen. [0004] In conventional SCR equipment, in order to ensure the mixing effect of urea solution and exhaust gas, the mixing space of exhaust gas and urea is relatively long. This design requires a larger installation space on the one hand, and increases the risk of...
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IPC IPC(8): F01N3/28F01N3/20
CPCF01N3/2892F01N3/2066F01N2610/02Y02A50/20
Inventor 何伟娇陈正国陈增响张旭付细平徐东陆超俊
Owner WUXI WEIFU LIDA CATALYTIC CONVERTER