Universal integrated DOC-DPF-SCR aftertreatment device

Abstract

The invention discloses a universal integrated DOC-DPF-SCR aftertreatment device. The device comprises a tank, a DOC-DPF unit, two SCR units, one or two urea mixers and an exhaust pipe, wherein the cross section of the tank is square, and the DOC-DPF unit and the exhaust pipe are arranged at a pair of diagonal angles of the square; the two SCR units and the two urea mixers are arranged symmetrically relative to the diagonal line of the DOC-DPF unit and the exhaust pipe; exhaust gas in the DOC-DPF unit enters the urea mixers after being discharged; the mixed exhaust gas in the urea mixers is discharged into the SCR units, and the exhaust gas in the SCR units is discharged into the exhaust pipe. The universal integrated DOC-DPF-SCR aftertreatment device can facilitate later-stage interchangeof the functional units, left and right arrangement of the tank and flexible and diversified arrangement of the air inlet and exhaust modes, and universal matched installation on different complete vehicles is achieved.

Description

technical field [0001] The invention relates to the technical field of diesel vehicle exhaust treatment, in particular to a generalized integrated DOC-DPF-SCR post-processing device. Background technique [0002] As the national diesel vehicle exhaust pollutant emission standards become more and more stringent, in order to meet the Euro VI and National VI emission standards, it is necessary to control the particulate matter, NO X (nitrogen oxides), HC (hydrocarbons) and CO (carbon monoxide) are controlled, therefore, it is necessary to combine DOC (oxidation catalytic converter), DPF (particulate filter) and SCR (selective catalytic reduction converter) ) are integrated in the box-type aftertreatment device. [0003] The existing box-type post-processing device realizes the integrated arrangement of DOC-DPF, SCR, and urea mixer. Among them, DOC and DPF are connected in series to form DOC-DPF; SCR is divided into two lines and arranged side by side on the same side of the t...

AI Technical Summary

Problems solved by technology

[0004] Although it can achieve good after-treatment of exhaust gas, the layout structure of the box-type after-treatment device requires that the supporting size of the whole vehicle is relatively large in the width and height directions, and it is difficult to meet more supporting needs; usually, for convenience For DPF maintenance, after the box-type after-processing device is assembled on the vehicle, the DPF needs to be located above the outer side. In order to achieve this purpose, the box-type after-processing device can only be assembled on the right side of the vehicle, and cannot be arranged on the left side.

[0005] In summary, how to solve the problem that the existing box-type post-processing devices cannot be universally set has become an urgent problem to be solved by those skilled in the art

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