Spiral mixer for integrated injection of SCR catalyst

Abstract

The invention belongs to the technical field of diesel engine tail gas aftertreatment, and relates to a spiral mixer for integrated injection of an SCR catalyst. The spiral mixer comprises a barrel. A front end cover and a rear end cover are arranged at the two ends of the barrel respectively. A first SCR carrier and a second SCR carrier are arranged in an inner cavity of the barrel. A gas inlet pipe is arranged at the position, between a first separation plate and the front end cover, of the barrel. A mixer device is arranged below the gas inlet pipe and comprises a taper pipe, a mixing pipe and a mixer body which are sequentially connected. The gas outlet end of the taper pipe is fixed to the first separation plate, and the gas inlet end of the mixer body is fixed to the front end cover. By means of the mixer, the aims of urea crushing, urea crystallization and even ammonia distribution can be effectively achieved.

Description

technical field [0001] The invention belongs to the technical field of post-treatment of diesel engine exhaust, and relates to a spiral mixer for integrated injection of an SCR catalytic converter. Background technique [0002] The traditional SCR (Selective Catalytic Reduction Converter) catalytic converter places the urea nozzle on the exhaust pipe through the connecting seat, which requires a large layout space, and for different chassis of the same engine, different layout spaces will lead to different locations for urea injection. changes, the urea injection performance also changes, resulting in the need for recalibration. At the same time, directly integrating the urea nozzle on the SCR catalytic converter is the need of many customers, but due to the difficulty in layout of the integrated nozzle and the lack of space for urea atomization, it is easy to cause urea droplets to be directly sprayed onto the EGP wall, resulting in serious urea crystallization problems . ...

AI Technical Summary

Problems solved by technology

[0002] The traditional SCR (Selective Catalytic Reduction Converter) catalytic converter places the urea nozzle on the exhaust pipe through the connecting seat, which requires a large layout space, and for different chassis of the same engine, different layout spaces will lead to different locations for urea injection. changes, urea injection performance changes, resulting in the need for recalibration

At the same time, directly integrating the urea nozzle on the SCR catalytic converter is the need of many customers, but due to the difficulty in layout of the integrated nozzle and the lack of space for urea atomization, it is easy to cause urea droplets to be directly sprayed onto the EGP wall, resulting in serious urea crystallization problems

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