Axial feeding integrated type SCR aftertreatment mixing cavity

Abstract

The invention relates to an axial feeding integrated type SCR aftertreatment mixing cavity. The axial feeding integrated type SCR aftertreatment mixing cavity comprises a mixing cylinder and is characterized in that a front partition plate and a rear partition plate are arranged in the mixing cylinder, a front cavity is formed by space in front of the front partition plate, a rear cavity is formed by space between the front partition plate and the rear partition plate, and through holes are formed in the front partition plate and the rear partition plate; an end cover is arranged on an opening in the front end of the mixing cylinder, a urea nozzle base and an air inlet communicated with the front cavity are arranged on the end cover, a mixing pipe is arranged in the rear cavity, the two ends of the mixing pipe are connected to the front partition plate and the rear partition plate, the axial direction of the mixing pipe is parallel to the axial direction of the mixing cylinder, and the rear end of the rear cavity is used for being connected with a catalyst carrier. The axial feeding integrated type SCR aftertreatment mixing cavity is simple, compact and reasonable in structure, ammonia gas and tail gas are fully mixed, the mixing time can be shortened, the gas mixing efficiency can be greatly improved, and the tail gas treatment effect is ensured.

Description

technical field [0001] The invention relates to a shaft-entry integrated SCR after-treatment mixing chamber, which belongs 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. SCR can meet the national IV and national V emission standards. The basic principle of SCR is to atomize 32.5% urea aqueous 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 urea aqueous solution passes through Pyrolysis and hydrolysis reactions produce 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 fully...

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Problems solved by technology

The SCR in the prior art has the problem of insufficient mixing of exhaust gas and ammonia gas in the process of treating automobile exhaust gas, resulting in incomplete exhaust gas treatment

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