Tail gas treatment system

Abstract

The invention discloses a tail gas treatment system. The tail gas treatment system comprises a tail gas collection device for collecting tail gas, a tail gas treatment pipeline of which the gas inlet end is connected with the gas outlet end of the tail gas collection device, a temperature compensation unit arranged on the tail gas treatment pipeline, a catalytic oxidation unit, a selective catalytic reduction unit, a reductant supply unit and a control unit connected with the temperature compensation unit and the reductant supply unit, wherein the catalytic oxidation unit and the selective catalytic reduction unit are sequentially connected in series with the interior of the tail gas treatment pipeline; and the outlet of the reductant supply unit is communicated with the tail gas treatment pipeline, and the communication part is positioned on the front side of the selective catalytic reduction unit. The tail gas treatment system can conveniently treat tail gas emitted by an engine in a centralized manner, can not cause secondary pollution in the treatment process, only needs to replenish a reductant in the long-term use process, and is low in using cost and easy to operate and maintain.

Description

technical field [0001] The invention belongs to the technical field of tail gas treatment, and in particular relates to a tail gas treatment system. Background technique [0002] Engine exhaust is a major factor of air pollution. For automobile engine factories, the engines on each stand continue to work during the production process, causing more serious pollution. The environmental protection department has already released pollutants from engine factories There are quite a few restrictions. [0003] In related technologies, the mainstream engine exhaust treatment equipment is dual-alkali method and chemical method. The former has a low purification capacity of nitrogen oxides, and the equipment will produce secondary pollution sources such as harmful waste water and waste heat. The latter mostly uses chemicals such as strong acids to Disposal of waste gas is costly, requires a separate storage space for hazardous chemicals, and produces secondary pollution. [0004] It ...

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Problems solved by technology

[0003] In related technologies, the mainstream engine exhaust treatment equipment is dual-alkali method and chemical method. The former has a low purification capacity of nitrogen oxides, and the equipment will produce secondary pollution sources such as harmful waste water and waste heat. The latter mostly uses chemicals such as strong acids to The cost of waste gas treatment is high, and a separate storage space for hazardous chemicals is required, causing secondary pollution

[0004] It is precisely because of these problems that the engine exhaust treatment equipment in the related art is not suitable for the daily operation of the engine and vehicle manufacturers. As a result, most automobile engine factories are unwilling to add exhaust treatment equipment or do not start the equipment according to the requirements after installation, thus causing environmental pollution. increased difficulty

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