Exhaust gas disposal device

Abstract

An exhaust gas disposal device comprises a shell, partition plates, a mixing cavity, a distributing cavity and a tail gas disposal module. The exhaust gas disposal device comprises a mixing device erected in the mixing cavity, and thus the mixing cavity is divided into a first cavity, a second cavity and a third cavity. The mixing device comprises a mixing pipe and a spinning disk installed on the mixing pipe, wherein the spinning disk comprises a plurality of fins which stretch into the first cavity in a protruding manner and are arranged in the circumferential direction. The exhaust gas disposal device further comprises a jet limiting cylinder fixed to the mixing pipe, and the jet limiting cylinder is used for enabling a urea nozzle to lead an atomized urea solution into the mixing pipe. Urea is evenly distributed on the pipe wall of the mixing pipe through centrifugal force generated by rotational flow, the urea evaporation area is increased, and the evaporation rate is increased. In addition, the distributing cavity is used for improving the distribution uniformity of urea liquid drips entering the distributing cavity from the mixing cavity, and thus the risk of urea crystallization is reduced.

Description

technical field [0001] The invention relates to an exhaust treatment device, which belongs to the technical field of engine exhaust post-treatment. Background technique [0002] Studies have shown that the uniformity of ammonia distribution in the pipeline of exhaust aftertreatment systems (such as selective catalytic reduction systems, SCR systems) has an important impact on the overall performance and durability of the system. If the distribution of ammonia is not uniform, it will lead to excessive ammonia in local areas, which will easily cause ammonia leakage, and the conversion efficiency of nitrogen oxides (NOx) will be too low in other ammonia-lean areas. The uneven distribution of ammonia over a long period of time can lead to uneven catalyst aging, which affects the overall performance of the catalyst. In addition, the uneven distribution of urea droplets will cause the temperature of the local pipe wall or mixing structure to be too low, forming crystallization, w...

AI Technical Summary

Problems solved by technology

If the distribution of ammonia is not uniform, it will lead to excessive ammonia in some areas, which will easily cause ammonia leakage, and the conversion efficiency of nitrogen oxides (NOx) will be too low in other ammonia-lean areas.

Uneven distribution of ammonia over a long period of time can lead to uneven catalyst aging, which affects the overall performance of the catalyst

In addition, the uneven distribution of urea droplets will cause the temperature of the local pipe wall or mixing structure to be too low, forming crystallization, which will block the exhaust pipe in serious cases and cause the engine power performance to decline

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