SCR (selective catalyst reduction) injector head of diesel engine

Abstract

The invention discloses an SCR (selective catalyst reduction) injector head of a diesel engine, which comprises a cooling seat and a mounting base, wherein the mounting base is communicated with an exhaust pipe of the diesel engine; the cooling seat is fixed on the mounting base and provided with an upper connecting seat; the upper connecting seat is provided with a flow channel, and a nozzle matched with the upper connecting seat is arranged in the cooling seat; a water-cooling cavity is formed between the nozzle and the cooling seat, and communicated with a water-cooling flow channel connected with a water pipe connector; a heat shield is arranged between the nozzle and the mounting base; and a thermal baffle is arranged at the joint of the cooling seat and the mounting base. Because the cooling seat is arranged and the heat shield is arranged between the nozzle and the mounting base, the SCR injector head of the invention is good in atomization and cooling effects, and the problem that urea solution blocks pipes caused by the high-temperature crystallization of the urea solution is avoided; meanwhile, the whole injector head is simple in installation, convenient in maintenance, small in volume, and easy to be arranged on the exhaust pipe of the diesel engine.

Description

technical field [0001] The invention relates to an injection head, in particular to an injection head used for spraying atomized urea liquid in a selective catalytic conversion system SCR (Selective Catalyst Reduction) of a diesel engine. Background technique [0002] At present, the rapid development of motor vehicles is accompanied by severe air pollution, which presents regional complex characteristics. The air pollution in many large cities has shifted from coal smoke pollution to coal smoke and motor vehicle pollution, and a few megacities have shown obvious Photochemical smog type (ie motor vehicle exhaust type) air pollution. Therefore, the research on diesel vehicle exhaust emission pollution control technology is extremely important and urgent. [0003] From the perspective of the development of commercial vehicles, diesel engines are their main power. Generally, diesel vehicles using supercharged technology can meet the emission requirements of stage I. Stage II u...

AI Technical Summary

Problems solved by technology

(2) Use EGR exhaust gas recycling technology to reduce NOx emissions + use particulate traps to reduce PM emissions. Currently, the first option is more inclined to use the traditional SCR selective catalytic reduction reaction to reduce NOx emissions, and spray urea on the high-temperature exhaust gas at the injection head When the solution is used, due to the high temperature, it is very easy to cause the high temperature crystallization of the urea solution to block the pipeline

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