Double-vortex-flow type urea mixing device

Abstract

The invention relates to a double-vortex-flow type urea mixing device, and belongs to the field of diesel engine tail gas after-treatment. The double-vortex-flow type urea mixing device comprises a front flange, a rear flange, a cylinder, a heat shield, a nozzle base and an in-cylinder assembly, the front flange and the rear flange are respectively welded at two ends of the cylinder, the heat shield is welded outside the cylinder, the nozzle base is welded on the cylinder, and the in-cylinder assembly is welded in the cylinder and is connected with the nozzle base; and the in-cylinder assembly comprises a front partition plate, a rear partition plate and a flow dividing pipe set, wherein the front partition plate and the rear partition plate are welded to the two sides of the flow dividing pipe set respectively. According to the double-vortex-flow type urea mixing device, a simple pipe and baffle structure is adopted to realize shunting and double-vortex rotation of urea, so that the mixing effect of urea and waste gas is improved, and the mixing uniformity of a SCR catalytic unit is ensured; and a notch in the upper end of the flow dividing pipe is used for guiding airflow to enter the flow dividing pipe from the two sides of the flow dividing pipe, so that urea sprayed from the upper portion is taken away smoothly, and the accumulation of the urea sprayed on the inner wall face of the flow dividing pipe is reduced.

Description

Technical field [0001] The present invention relates to a dual spiral flow type mixing apparatus urea, belonging to the field of diesel engine exhaust after treatment. Background technique [0002] In the SCR system applied technology, how urea is sprayed into the engine and exhaust gas are uniformly mixed and complete secondary crushing of urea, reducing the risk of crystallization of the urea in the mixer is the key position in the development process. [0003] Urea common mixer mixing unit using a multi-fin structure, and the decomposition of urea to achieve crushing plate structure unit and other fibers, while mixed orifice or orifice tube structure or urea structure to achieve the cyclone. However, the current common on the market most of generating a unidirectional structure swirl swirl flow so as to enhance the uniformity and homogeneity of the ammonia gas in the catalytic unit. In recent years, there is also a plurality of structures formed bidirectional swirl cyclone eff...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the above disadvantages, to provide a urea mixing device that can realize double rotating vortex by adopting a set of swirl structure, so as to solve the problem of SCR Poor mixing uniformity in the system, slow diversion of urea, poor decomposition, and prevention of urea crystallization

Images