Catalyst spraying device and method in SCR system

Abstract

The invention relates to a catalyst spraying device and method in an SCR system. The catalyst spraying device comprises a spraying controlling module, a liquid absorbing and filling module, a compressed air controlling module and a spraying module. The spraying controlling module, the liquid absorbing and filling module, the compressed air controlling module and the spraying module are integrated; the spraying controlling module is used for calculating the spraying quantity of catalyst required to be sprayed in accordance with the working condition of an engine and the condition of air exhausting and controls the liquid absorbing and filling module to quantificationally suck the catalyst; the liquid absorbing and filling module is used for quantificationally transferring the sucked catalyst into the spraying module through a liquid channel; the compressed air controlling module is used for controlling compressed air from a vehicle air source to transfer the compressed air into the spraying module through an air channel; and the spraying module is used for quantitative spraying atomization of the catalyst transferred by the liquid absorbing and filling module under the effect of the compressed air. According to the catalyst spraying device and method in the SCR system, the installation process is simplified, and spraying accuracy can be improved.

Description

technical field [0001] The invention relates to an automobile aftertreatment system and method, in particular to a catalyst injection device and method in an SCR system. Background technique [0002] The difference between the SCR system and the EGR system of the national V standard engine exhaust post-treatment technology refers to the technology for properly treating the exhaust gas emitted by the engine to reduce environmental pollution caused by it. For the SCR (selective catalytic reduction, selective catalytic reduction) system, a catalyst is used to treat pollutants in the exhaust gas. The reasons why the SCR system is more suitable for the Chinese market can be attributed to the following aspects: First, the SCR system can effectively save fuel consumption. Second, if this technology is adopted now, the requirements of emission regulations can be met for a long time until the introduction of Euro V and even higher emission standards; third, in the EGR+DPF system, it...

AI Technical Summary

Problems solved by technology

Most of the existing SCR catalyst injection devices in the market are split-type, which are composed of multiple modules installed on the vehicle separately. The installation process is cumbersome, and the injection accuracy is not high enough. Too much catalyst injection will easily cause waste, crystallization, and too little can not achieve Expected Effects of Treating Pollutants

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