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SCR mixing system and SCR mixer thereof

A mixer and gradually expanding pipe technology, applied in the field of denitrification, can solve the problems of reducing SCR conversion efficiency, increasing ammonia leakage, performance deterioration, etc., and achieving the effects of reducing loss, reducing eddy current area, and reducing back pressure

Active Publication Date: 2019-01-11
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The current SCR mixer has a straight-hole structure, which leads to high back pressure. If crystallization occurs, the exhaust back pressure will increase rapidly, deteriorating performance and increasing fuel consumption; in addition, the gas mixed with this mixer passes through The uniformity of the carrier is poor, which reduces the SCR conversion efficiency and increases the risk of ammonia leakage

Method used

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  • SCR mixing system and SCR mixer thereof
  • SCR mixing system and SCR mixer thereof
  • SCR mixing system and SCR mixer thereof

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Embodiment Construction

[0025] In view of this, the core of the present invention is to provide an SCR mixer to alleviate the problem of high back pressure. Another core of the present invention is to provide an SCR mixing system with an SCR mixer.

[0026] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Such as Figure 1-Figure 4 As shown, the present invention discloses an SCR mixer, which includes an SCR carrier 28 and a mixer housing 29 with a urea nozzle 21, and also includes a first-stage divergent pipe 26 and a second-stage divergent pipe 27. Among them, the urea nozzle 21 is installed on the mixer housing 29 through the nozzle mounting seat 22; one end of the first-stage divergent pipe 26 is connected to the mixer housing 29; one end of the second-stage divergent pipe 27 is connected to the first-stag...

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Abstract

The invention discloses an SCR mixer. The SCR mixer comprises an SCR carrier and a mixer shell provided with a urea nozzle, and further comprises a first-stage diverging tube and a second-stage diverging tube, wherein one end of the first-stage diverging tube is connected with the mixer shell; the second-stage diverging tube is connected with the other end of the first-stage diverging tube, and the other end of the second-stage diverging tube is connected with the SCR carrier; the first-stage diverging tube and the second-stage diverging tube gradually expand from the mixer shell to the SCR carrier. By adopting the two-stage diverging tubes, the diameter of a pipeline is in smooth transition when gas flows, resistance to the gas is reduced, the backpressure is reduced, a vortex region is decreased, and the flow velocity is distributed uniformly. Meanwhile, loss of local route blockage is reduced. Moreover, the more sufficiently the gas is diffused at an inlet section of the SCR carrier, the closer the flow velocities of channels of the SCR carrier. The conversion efficiency of NOx in waste gas can be improved. The invention further discloses an SCR mixing system comprising the SCRmixer.

Description

Technical field [0001] The invention relates to the technical field of denitration, in particular to an SCR mixing system and an SCR mixer. Background technique [0002] Selective Catalytic Reduction is the most important denitration technology in the industry. It is widely used in ships, motor vehicles, thermal power plants and other fields. The combustion of engines or boilers produces nitrogen oxides NOx. These gases are discharged into the atmosphere, which will bring acid rain, photochemical smog, ozone layer depletion and other hazards, affecting human life . SCR technology is under the action of a catalyst, the reactants are adsorbed on the catalyst to generate nitrogen and water that are harmless to humans. Due to the existence of the catalyst, the denitration efficiency can reach a very high level. [0003] The current SCR mixer has a straight-hole structure. This structure leads to higher back pressure. If crystallization occurs, the exhaust back pressure will increase ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20F01N3/28F01N13/08
CPCF01N3/2066F01N3/208F01N3/28F01N13/08Y02T10/12
Inventor 周萌李光辉庄士俊周仁杰刘晶晶
Owner WEICHAI POWER CO LTD
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