Two-blade conical surface type cyclone urea mixing device

Abstract

The invention belongs to the technical field of diesel engine tail gas treatment system equipment, and relates to a two-blade conical surface type cyclone urea mixing device which comprises a barrel body; a cyclone pipe is fixedly arranged in an inner cavity of the barrel body; the axis of the cyclone pipe is mutually perpendicular to that of the barrel body; the two ends, in the axial direction of the barrel body, of the cyclone pipe are fixedly equipped with a first partition and a second partition separately; the first partition, the second partition and the cyclone pipe are used for dividing the barrel body into a gas inlet cavity and a gas outlet cavity; the two ends of each of the first partition and the second partition are separately arched in a circular-arc mode towards the two ends of the barrel body; one end of the cyclone pipe is in contact with the inner wall of the barrel body, and the other end of the cyclone pipe is equipped with a jetting base; a urea spray nozzle is arranged on the jetting base; a thermal-insulation layer covers the surface of the barrel body; and a notch is formed in a position, which corresponds to the jetting base, of the thermal-insulation layer. The mixing device can effectively solve the problems that in an existing SCR tail gas treatment process, a mixing path for ammonia gas and tail gas is relatively short, and tail gas treatment is affected by insufficient mixing.

Description

technical field [0001] The invention belongs to the technical field of diesel engine tail gas treatment system equipment, and relates to a two-page conical swirl urea mixing device. Background technique [0002] As diesel engine emission regulations become increasingly stringent, exhaust gas after-treatment technology is a technical measure that must be adopted. However, SCR can meet the national IV, V and national VI emission standards. The basic principle of SCR is to atomize 32.5% aqueous urea solution through the urea injection system (commonly known as urea pump) and spray it into the exhaust pipe to mix with the engine exhaust. The aqueous solution undergoes pyrolysis and hydrolysis reactions to generate ammonia gas (NH 3 ), under the action of the catalyst, ammonia converts harmful nitrogen oxides (NOx) in diesel engine exhaust into harmless nitrogen (N 2 ) and water, the primary task of the SCR route of engine exhaust gas treatment technology is to effectively mix ...

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Problems solved by technology

[0003] In view of the above problems, the present invention provides a two-page conical swirling urea mixing device, which can effectively solve the problem that the mixing path of ammonia and tail gas is relatively short in the existing SCR process of tail gas treatment, and the problem that insufficient mixing affects tail gas treatment

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