Pipeline system for SCR after-treatment system and SCR after-treatment system

Abstract

The invention relates to a pipeline system for an SCR after-treatment system and the SCR after-treatment system. The SCR after-treatment system comprises an SCR reactor and a urea supply device connected to an inlet of the SCR reactor, and further comprises the pipeline system for the SCR after-treatment system, wherein the pipeline system comprises a vent pipeline to be connected between an exhaust pipe of a diesel engine and the SCR reactor; an exhaust gas denitration device used for removing nitrogen oxides in exhaust gas is arranged in the vent pipeline; and an ammonia removal device is arranged downstream the exhaust gas denitration device. According to the after-treatment system provided by the invention, as the nitrogen oxides are removed from the exhaust gas, the nitrogen oxides and ammonia gas in the exhaust gas cannot interfere with atomization and decomposition of urea in the SCR after-treatment system and researches about ammonia gas distribution in the SCR reactor, and the accuracy of research experiments is improved; the structure of the SCR after-treatment system is simple; the SCR after-treatment system can be obtained by directly adding the pipeline system provided by the invention between the exhaust pipe of the diesel engine and an original SCR after-treatment system instead of changing the original SCR after-treatment system; and the practicability is strong.

Description

technical field [0001] The invention relates to a pipeline system for an SCR post-processing system and an SCR post-processing system. Background technique [0002] As a main power plant, diesel engine is widely used in important fields such as transportation, energy power and agricultural machinery by virtue of its advantages in thermal efficiency, power and fuel economy. Since the diesel engine works in the oxygen-enriched state by means of diffusion combustion, the main pollutants in the exhaust gas are NOx and PM. However, there is a paradoxical relationship between the generation of NOx and PM in the engine, making it difficult to reduce both of them at the same time only by internal purification measures. Reduce PM in the machine by adopting high-pressure injection, optimized combustion and other measures, and then reduce NOx through Selective Catalytic Reduction (SCR, Selective Catalytic Reduction) technology. By adding atomized and decomposed urea solution to the SC...

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Problems solved by technology

[0004] The object of the present invention is to provide a piping system for an SCR post-treatment system to solve the problem of studying urea atomization, decomposition, ammonia gas in the SCR post-treatment system The technical problem that can be affected by the nitrogen oxides in the exhaust gas when distributed in the SCR reactor; the purpose of the present invention is also to provide a kind of SCR post-treatment system

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