SCR catalytic silencer device

Abstract

The invention provides a SCR catalytic silencer device. The device comprises an intake pipe and an urea nozzle, and further comprises a nozzle protection device and a first-grade cyclone; the nozzle protection device is a front end cover with an inward concave structure; multiple first blades are uniformly inclined on the outer wall of the first-grade cyclone at intervals, and are provided with gaps; the urea nozzle is vertically mounted on the upper surface of the inward concave structure of the front end cover; the first-grade cyclone is mounted on the lower surface of the inward concave structure of the front end cover; the intake pipe penetrates through the outer wall of a SCR box; and an outlet direction of the intake pipe is perpendicular to the axial direction of the first-grade cyclone, so that engine-exhausted gas fed from the intake pipe is fed in a pipe of the first-grade cyclone by the gaps of the multiple first blades.

Description

technical field [0001] The invention relates to a muffler device, in particular to an SCR catalytic muffler device. Background technique [0002] SCR technology is one of the main post-treatment technologies for eliminating nitrogen oxides in diesel engine exhaust. SCR technology needs catalyst assistance to eliminate nitrogen oxides (NOx). The catalyst is coated on the carrier, and special materials and structures are added to the carrier. It is designed to play the role of noise reduction, and after the packaging is completed, it is called the SCR catalytic muffler. [0003] The SCR catalytic noise reduction system is mainly divided into three parts according to the function: the control unit, the urea dosage unit and the catalytic reaction unit. Among them, the control unit of the SCR system is integrated with the engine control unit (ECU), collectively referred to as the control unit, which is mainly used to implement the SCR control strategy, and according to the ambie...

AI Technical Summary

Problems solved by technology

Moreover, there are strict requirements on the installation angle of the nozzle of the traditional structure SCR tank, which must be at least above the horizontal plane, and the layout of the whole vehicle is severely restricted; moreover, the urea nozzle is exposed outside the tank, and the urea pipe joint is easily broken during transportation and use, resulting in a failure rate high

Therefore, there is an urgent need to solve the problem of insufficient mixing of exhaust gas and urea caused by the small exhaust gas flow rate and low flow rate of medium-sized displacement engines, resulting in serious crystallization.

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