Urea mixing device

Abstract

The invention discloses a urea mixing device. A partition is arranged between a front housing and a rear housing, a breaking plate is fixed to the partition, a front baffle is arranged on the front end part of the partition, an opening is formed in a part corresponding to the partition, of the front baffle, a flow guide plate and a hole plate are arranged on the opening, and an intake port is formed between the flow guide plate and an inner wall surface corresponding to the front housing; a blade opened inwards and towards an injection cavity is formed in the flow guide plate; a plurality of first through holes are formed in the hole plate; grating openings are formed in a wall surface facing the breaking plate, of the partition; and the rear housing is provided with a waist-reducing part.According to the urea mixing device, the plurality of grating openings are formed in the part facing the breaking plate, of the partition, and play a role of secondary breaking on urea drops, and more thorough atomization and volatilization for the urea drops are ensured, so that adequate mixing for mixed gas flow is much benefited, and higher mixing uniformity is achieved. The rear housing is provided with the waist-reducing part, and the flowing speed of the mixed gas flow while passing through the waist-reducing part, is increased, so that a better mixing effect and higher mixing uniformity are achieved.

Description

technical field [0001] The invention relates to the technical field of automobile exhaust post-treatment, in particular to a urea mixing device. Background technique [0002] The automobile exhaust after-treatment device belongs to the engine exhaust system, and its main function is to reduce the nitrogen oxides (NO X ), hydrocarbons (CH), carbon monoxide (CO) and other harmful gases are converted into environmentally friendly nitrogen (N 2 ) and water (H 2 O) etc. At present, DOC (oxidizing catalyst) + DPF (particulate filter) + SCR (selective catalytic reduction) technology is often used in diesel engines to post-treat exhaust emissions, and the atomization and mixing effects of urea aqueous solution in post-treatment, It has a great influence on the selective reduction reaction in the subsequent SCR. Improving the uniformity of mixing urea and exhaust gas in the mixer is the key to improving the conversion efficiency of aftertreatment. [0003] Existing exhaust gas po...

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Problems solved by technology

[0004] Aiming at the disadvantages of poor gas flow velocity distribution uniformity, easy formation of urea crystallization and poor mixing uniformity in the existing tail gas post-treatment mixer, the applicant provides a peanut shell type urea mixing device with reasonable structure, which has high gas flow velocity distribution uniformity and crystallization Low risk, high mixing uniformity

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