Two-way rotational flow cylinder type urea mixing device

Abstract

The invention relates to a two-way rotational flow cylinder type urea mixing device which comprises a nozzle base, a base supporting cover, a rotational flow pipe, a metal mesh ring, a supporting plate, a back rotational flow plate, a front rotational flow plate and a cylinder; the supporting plate is arranged inside the cylinder, a hole is formed in the front part of the supporting plate, the front rotational flow plate is installed inside the hole, the back rotational flow plate is installed at the rear part of the supporting plate, and the front rotational flow plate, the supporting plate and the back rotational flow plate form a mixing cavity inside the cylinder; the nozzle base, the base supporting cover, the rotational flow pipe and the metal mesh ring are sequentially fixedly connected from top to bottom, the base supporting cover penetrates through the hole in the cylinder and is fixedly connected with the cylinder, and the rotational flow pipe runs into the hole in the middle of the supporting plate to be fixedly connected with the supporting plate; the metal mesh ring stretches into the mixing cavity; the nozzle base, the base supporting cover, the rotational flow pipe and the metal mesh ring are inclined. On the condition of ensuring urea mixing uniformity, the crystallization problem that the urea decomposition efficiency is not high in an SCR system is solved.

Description

technical field [0001] The invention relates to a two-way swirling cylinder type urea mixing device, which belongs to the field of post-treatment of diesel engine exhaust. Background technique [0002] In the SCR system application technology, the mixing uniformity of urea and exhaust gas, the risk of urea crystallization and the decomposition rate of urea are the key indicators for evaluating the urea mixing device. The urea mixing device needs to fully consider the balance of these three indicators in order to play a greater role. [0003] Conventional urea mixers usually use fin structures to disturb the parallel airflow to achieve mixing and decomposition of urea and exhaust gas. In recent years, in order to reduce the risk of crystallization of urea on the wall of the mixer, a swirl structure has gradually been adopted to form a swirling airflow to achieve higher mixing uniformity. However, since the injection direction of urea is not consistent with the swirl flow di...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a two-way swirling cylinder type urea mixing device, which can solve the problem of low urea decomposition efficiency and crystallization in the SCR system while ensuring the uniformity of urea mixing. question

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