Integrated tail gas aftertreatment system

Abstract

The invention discloses a tail gas aftertreatment system for treating engine tail gas. The system comprises a cover (3, 4) for limiting mixing chamber inside, an oxidation catalyst unit (1) and a SCRoF unit (2) assembled on the cover and both communicated with a fluid in the mixing chamber, a reducing agent metering module (5) mounted on the cover for spraying a reducing agent from the oxidation catalyst unit (1) into tail gas in the mixing chamber, and a cyclone guide piece (6) arranged in the mixing chamber and configured to guide a mixture of the tail gas and the reducing agent to flow into the SCRoF unit (2) from the mixing chamber in a cyclone manner.

Description

technical field [0001] The present application relates to an integrated aftertreatment system for treating exhaust gases emitted by an engine, in particular a diesel engine, which is configured for installation in an engine compartment. Background technique [0002] Engine exhaust contains harmful components. In order to reduce the emission of harmful components in exhaust gas, various after-treatment technologies have been developed. [0003] For example, a typical exhaust aftertreatment system for a diesel engine includes a diesel oxidation catalyst (DOC), a selective catalytic reduction module (SCR) and a diesel particulate filter (DPF). [0004] DOC, SCR and DPF can be arranged in series under the chassis of the vehicle. In this layout, since there is a relatively large available space, it is easy to arrange the various components. [0005] In another type of layout, the DOC, SCR and DPF are installed in the engine compartment. According to this arrangement, the afte...

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However, this layout still leaves a lot of room for compre

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