Gas jet flow type blue adding combined ejector and application thereof

Abstract

The invention discloses a gas jet flow type blue adding combined ejector. The ejector comprises a double-layer casing pipe, a blue adding channel is formed in a pipe side of the double-layer casing pipe, a compression air channel is formed in a shell side, and the blue adding channel and the compression air channel are coaxial and are isolated from each other; a pneumatic nozzle is formed in the front end of the double-layer casing pipe and comprises a nozzle shell, a casing pipe joint and a rotary flow core; an annular nozzle gas phase channel is formed between the nozzle shell and the rotary flow core, a nozzle liquid phase channel is formed in the rotary flow core, and the two channels are communicated with the front end of the blue adding channel and the front end of the compression air channel correspondingly; the outlet end of the nozzle gas phase channel is provided with a compression air ring line outlet, and the outlet end of the nozzle liquid phase channel is provided with a blue adding ejecting hole; the rear end of the compression air channel is sealed, a compression air inlet pipe is arranged on the rear portion of the compression air channel, and a compression air inlet is formed in the compression air inlet pipe; a blue adding inlet is formed in the rear end of the blue adding channel. According to the ejector, compression air is used for serving as a blue adding ejecting power source, and pump-free quantitative ejecting of added blue is achieved.

Description

technical field [0001] The invention relates to a vehicle SCR exhaust aftertreatment system, in particular to a gas jet type Tianlan combination injector used in the system and its application. Background technique [0002] Nitrogen oxides (hereinafter referred to as "NOx") are one of the main harmful emissions of engines, and they are becoming more and more polluting to the atmosphere, which has been widely concerned. With the continuous upgrading of emission regulations, the SCR technology route has become the mainstream technology route for reducing NOx emissions from diesel locomotives in the industry. [0003] Tianlan (urea aqueous solution with a mass fraction of 32.5%) is the reducing agent used in SCR technology. Its injection volume and atomization effect directly affect the NOx emission level of diesel locomotives and the degree of secondary pollution to the atmosphere. Therefore, Tianlan The quantitative injection and atomization of blue is the core problem that ...

AI Technical Summary

Problems solved by technology

[0005] 1) The metering pump is a precise quantitative execution unit, with high manufacturing cost, difficult design and large installation volume

[0006] 2) When the metering pump is not used for a long time, the Tianlan remaining in the metering pump will form crystals, which may affect the normal filling of Tianlan in later use

[0007] 3) The metering pump needs to be connected to the liquid inlet pipe, liquid return pipe, injection pipe, and compressed air pipe. There is also a

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