SCR urea mixer

Abstract

The invention discloses an SCR urea mixer. The SCR urea mixer comprises a spiral mixing cavity at the front end and a flow equalizing cavity at the rear end, wherein the spiral mixing cavity comprises a gas inlet end panel, a gas outlet end panel and a spiral type rotational flow guide plate, the guide plate forms a vortex convergence type gas flow channel from a gas inlet to a gas outlet, a turbulent flow strip is arranged in the channel, a flow dividing plate is transversely arranged along a urea solution spraying direction path, and a flow equalizing disc is arranged in the flow equalizing cavity along the radial direction of a cylinder body. According to the mixer, hot tail gas flow is distributed and guided, and a urea aqueous solution is strongly crushed and atomized, so that the urea aqueous solution is quickly and fully atomized and pyrolyzed; mixed gas flows at a high speed in the spiral vortex convergent type gas flow channel, so that uniform and sufficient mixing is realized; the turbulent flow strip is used for distributing, guiding, crushing and disturbing the mixed and high-speed flowing hot air flow; and the flow equalizing disc is used for distributing and guiding high-speed rotational flow entering a rear chamber of the mixer through the gas outlet, so that the conversion rate of ammonia is greatly improved.

Description

technical field [0001] The invention designs an SCR urea mixer, relates to the hot tail gas post-treatment technology of a diesel internal combustion engine, in particular to an SCR urea mixer for a diesel internal combustion engine hot tail gas post-treatment system. Background technique [0002] As the country pays more and more attention to environmental protection and the implementation of the national VI emission regulations for diesel internal combustion locomotives, urea is widely used in the hot exhaust aftertreatment system of diesel internal combustion engines to reduce and eliminate NO in the hot exhaust. X , that is, SCR technology; SCR technology is a technology that uses the chemical principle of selective catalytic reduction to realize the after-treatment and purification of exhaust gas. SCR treatment technology can effectively reduce the NOx emission of diesel engines and meet the emission standards. During the working process of the SCR treatment system, the...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems and design defects in the existing SCR urea mixer technology for the aftertreatment system of diesel internal combustion engines, the purpose of the present invention is to overcome and solve the performance deficiencies of the existing SCR mixer, including the insufficient atomization of urea aqueous solution injection , the formation of urea crystals, and low ammonia conversion

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