Rotary flow urea mixing device

Abstract

The invention provides a rotary flow urea mixing device comprising an end cover, a cylinder body, a rotary-flow tube, a front porous separator, a rear porous separator, a separator, an air inlet pipe,and a urea nozzle mounting seat; the front end of the cylinder body is provided with the end cover and a back end opening is used as an air outlet; the cylinder body is internally provided with the separator, the front porous separator, and the rear porous separator in sequence at intervals from front to rear so as to divide the interior of the cylinder body into a first cavity between the separator and the end cover, a second cavity between the separator and the front porous separator, and a third cavity between the front porous cavity separator and the rear porous separator; a front sectionof the air inlet pipe extends out of the first cavity of the cylinder body, and a rear section of the air inlet pipe is arranged in the cylinder body and is provided with a diversion opening communicating with the first cavity of the cylinder body; the front section of the air inlet pipe is provided with an air inlet; the rotary-flow tube is arranged in the cylinder body; the rotary-flow tube includes a rotary-flow section and a porous section, wherein the rotary-flow section is arranged in the first cavity of the cylinder body, and the porous section is arranged in the second cavity of the cylinder body; and the end cover is provided with the urea nozzle mounting seat. The rotary flow urea mixing device can improve the mixing effect of ammonia gas and tail gas.

Description

technical field [0001] The invention relates to a urea mixing device for vehicle exhaust gas treatment, in particular to a swirl urea mixing device. Background technique [0002] With the increasingly stringent diesel engine emission regulations, exhaust aftertreatment technology is a necessary technical measure. SCR can meet the national IV, V and national VI emission standards. The basic principle of SCR is to atomize a 32.5% concentration of urea aqueous solution through the urea injection system (commonly known as urea pump) and then spray it into the exhaust pipe to mix with the engine exhaust. The aqueous solution generates ammonia (NH3) through pyrolysis and hydrolysis. Under the action of a catalyst, ammonia converts harmful nitrogen oxides (NOx) in diesel engine exhaust into harmless nitrogen (N2) and water. Engine exhaust treatment technology SCR The first task of the route is to effectively mix and chemically react the exhaust gas with the ammonia mist, while mai...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the mixing path of ammonia gas and tail gas is relatively short in the existing SCR process of treating tail gas, and the insufficient mixing affects the treatment of tail gas. It provides a simple structure and compact design that can improve the mixing effect of ammonia gas and tail gas. Cyclone urea mixing device

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