Vehicle tail gas treatment treating fluid mixing device

Abstract

The invention provides a vehicle tail gas treatment treating fluid mixing device. The vehicle tail gas treatment treating fluid mixing device is mainly characterized by comprising a first cavity, anda second cavity is formed in the side face of the first cavity; one end of the first cavity is closed, and an opening in the other end of the first cavity serves as a gas outlet; the second cavity isprovided with a gas inlet pipe and a treating fluid inlet; the second cavity is internally provided with a rotational flow pipe aligned with the treating fluid inlet; the rotational flow pipe is provided with vortex generation blades around the axis; the vortex generation blades are located on the section, close to the treating fluid inlet, of the rotational flow pipe, and the other section, deviating from the treating fluid inlet, of the rotational flow pipe is a porous section; the porous section on the rotational flow pipe partially stretches into the first cavity; and turbulent flow partition plates are arranged in the first cavity and behind the second cavity. By means of the vehicle tail gas treatment treating fluid mixing device, the ammonia mist mixing effect can be improved, and ammonia gas and tail gas are mixed more sufficiently.

Description

technical field [0001] The invention relates to a urea mixing device for vehicle tail gas treatment, belonging to the technical field of diesel engine tail gas treatment system equipment. 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 effectivel...

AI Technical Summary

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 increase the mixing path of ammonia gas and tail gas. Treatment liquid mixing device for vehicle exhaust gas treatment

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