Swirl device for diesel emission post-processing

Abstract

The invention discloses a swirl device for diesel emission post-processing. The swirl device comprises a shell, the shell is internally provided with an SCR carrier, the downstream end of the shell isprovided with a gas outlet, the upstream end of the shell is provided with an end cover, a gas feeding pipe is connected to the end cover, the middle of the shell is provided with a partition plate and a diffusion plate in the axial direction in a spaced mode, and diffusion holes are uniformly distributed in the diffusion plate; primary swirl blades are fixedly connected to the interior of the gas feeding pipe; a sleeve is fixedly connected to the surface of the upstream side of the partition plate, swirl ventilation holes are uniformly distributed in the sleeve in the circumferential direction, secondary swirl blades are connected to the positions, at the swirl ventilation holes, of the partition plate, and gas feeding holes are uniformly distributed in the positions, in the sleeve, of the gas feeding pipe; and partition plate main gas holes are uniformly distributed in the position, located on the outside of the sleeve, of the partition plate. According to the swirl device, the gasand liquid uniform mixing effect is ensured through the small size, the swirl device can adapt to the installation spaces of most diesel vehicles, meanwhile, the overall pressure drop of gas flow is controlled in the good level, the gas and liquid mixing effect can be ensured, moreover, the whole size can be decreased, the engine oil consumption is not increased, and the good market prospect is achieved.

Description

technical field [0001] The invention relates to the technical field of diesel engine exhaust post-treatment. Background technique [0002] With the upgrading of emission regulations, the single use of SCR (selective catalytic reduction) system or DPF (particulate capture) system for diesel engines can no longer meet the regulations on NOx (nitrogen oxides), PM (particulates) and PN (particulate number) Limit value requirements, DPF system and SCR system must be used at the same time to meet the limit value requirements of emission regulations. The existing SCR system includes a casing, and an SCR carrier is arranged in the casing, and the exhaust gas reacts and is purified when passing through the casing. [0003] However, the DPF+SCR system with a traditional structure has a large overall volume, long length and poor universality due to its independent hybrid structure. Especially under the requirements of more stringent environmental emission standards, the DPF+SCR syste...

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Problems solved by technology

However, the traditional gas-liquid mixing structure can no longer meet the above requirements.

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