SCR (selective catalyst reduction) jetting system

Abstract

The invention relates to an SCR (selective catalyst reduction) jetting system, which comprises an adblue tank, a conveying pump, a pressure storage cavity, a pressure regulating valve, an air storage tank and a nozzle. The nozzle comprises a compressed air inlet and an adblue inlet; an output end of the pressure storage cavity is communicated with the adblue inlet of the nozzle, and an output end of the air storage tank is communicated with the compressed air inlet of the nozzle; the adblue tank comprises a tank body, a pump body is arranged on the tank body, the conveying pump, the pressure storage cavity and the pressure regulating valve are disposed in the pump body, an input end of the conveying pump is communicated with the inside of the tank body, and an output end of the conveying pump is communicated with the pressure storage cavity; and a backflow end of the pressure storage cavity is communicated with the inside of the tank body via the pressure regulating valve. The tank body, the conveying pump, the pressure storage cavity and the pressure regulating valve are integrated, the structure of the SCR jetting system is simplified, arrangement of a total vehicle is more convenient, and cost of the total vehicle is reduced.

Description

technical field [0001] The invention relates to an exhaust purification system of an internal combustion engine, in particular to a selective catalytic reduction system (SCR injection system, Selective Catalyst Reduction) used for aftertreatment of diesel engine exhaust to reduce NOx emissions of diesel engines. Background technique [0002] For the emissions of motor vehicles, people use various methods to eliminate the harmful substances contained in them. SCR technology is a very effective way to reduce NOx compounds. The engine SCR post-treatment technology is to spray the reducing agent urea solution into the engine exhaust. Under the action of exhaust gas temperature and air flow, the urea solution can quickly decompose and release ammonia, and reduce NOx to nitrogen to achieve the effect of reducing NOx. Because urea solution has the advantages of stable performance, simple chemical reaction, and relatively small amount of reducing agent, it has been popularized and ...

AI Technical Summary

Problems solved by technology

Generally, gas-assisted injection is used to improve the atomization effect by using the interaction of gas and liquid. The traditional atomization injection system uses liquid and gas to mix in the cavity at the front of the nozzle. However, the position of the nozzle hole of the injector is still prone to clogging of the nozzle hole by Tianlan crystal

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