Inner high pressure formed two-wall hollow urea spraying mixing device

Abstract

The invention is suitable for the technical field of tail gas treatment and provides an inner high pressure formed two-wall hollow urea spraying mixing device. The inner high pressure formed two-wallhollow urea spraying mixing device comprises a gas inlet end, a gas outlet end and a two-wall hollow structure; the two-wall hollow structure comprises an outer wall and an inner wall, and a sealed inert gas layer is arranged between the outer wall and the inner wall; the outer wall is in sealed combination with the gas inlet end and the gas outlet end; the two ends of the inner wall are arc and are in sealed combination with the two ends of the outer wall correspondingly; and the two-wall hollow structure is integrally formed through inner high pressure. In this way, according to the inner high pressure formed two-wall hollow urea spraying mixing device, the heat preservation effect of a pipe body is improved through the two-wall hollow structure, the NOx conversion rate is increased, andthe urea crystallization phenomenon is prevented.

Description

technical field [0001] The invention relates to the technical field of tail gas treatment, in particular to an internal high-pressure formed double-wall hollow urea injection mixing device. Background technique [0002] Selective catalytic reduction technology (SCR) is a treatment process for NOx in diesel vehicle exhaust emissions, that is, under the action of a catalyst, the reducing agent ammonia or urea is injected to reduce the NOx in the exhaust gas to N2 and H2O. Specifically, after the exhaust gas comes out of the turbine, it enters the exhaust mixing pipe. A urea metering injection device is installed on the mixing pipe, and the urea aqueous solution is sprayed. The urea generates NH3 after hydrolysis and pyrolysis at high temperature, so that the NOx in the tail gas is reduced to N2 and H2O. The traditional process adopts the combination of single-layer pipe + insulation layer and urea nozzle seat. The disadvantages are: 1. The temperature drop effect is poor, whi...

AI Technical Summary

Problems solved by technology

The traditional process adopts the combination of single-layer pipe + insulation layer and urea nozzle seat. The disadvantages are: 1. The temperature drop effect is poor, which affects the pyrolysis rate of urea solution and affects the discharge standard; 2. The pipe wall is prone to heat exchange, causing Large urea particles hit a wall and crystallize

[0003] In summary, there are obviously inconveniences and defects in the actual use of the existing technology, so it is necessary to improve

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