Diesel engine after-treatment system capable of meeting National sixth-stage emission standard

Abstract

The invention discloses a diesel engine after-treatment system capable of meeting the National sixth-stage emission standard. The diesel engine after-treatment system capable of meeting the National sixth-stage emission standard comprises a low-temperature SCR urea after-treatment system and a low-temperature fuel injection combustion-supporting catalytic regeneration DPF system; and a DPF catalyst and an SCR catalyst are connected between exhaust pipes in series through flanges. According to the diesel engine after-treatment system capable of meeting the National sixth-stage emission standard, based on the national fifth-stage diesel engine technology, the system comprising a low-temperature burner, a DOC, a CDPF and an SCR meets the National sixth-stage emission standard, a large quantity of diesel engine internal heat management calibration is not needed, after-treatment heat management calibration is independent, internal and external coupling calibration is lowered, and the diesel engine after-treatment system is easy to install and arrange, convenient to maintain, and suitable for various domestic diesel engines meeting the after-treatment requirements of the National sixth-stage emission standard.

Description

technical field [0001] The invention relates to the technical field of diesel engine aftertreatment, in particular to a diesel engine aftertreatment system that meets the national six emission standards. Background technique [0002] In recent years, smog has appeared in major cities in my country, seriously endangering people's health and affecting my country's international image. Controlling the emission of nitrogen oxides and particulate matter in diesel engine exhaust is the key to controlling urban air pollution. Diesel engine is an important product supporting the development of my country's national economy. The number of diesel engines increases at a rate of 18% every year, and the pressure on environmental protection is huge. On the other hand, my country's emission regulations are becoming increasingly stringent. The NOx emission limit has been reduced from 3.5g / kW. g / kW.h is reduced to 0.01g / kW.h of China VI. The original in-machine purification technology can ...

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Problems solved by technology

However, under the cycling conditions of urban driving conditions, the exhaust temperature of the diesel engine is very low, and it is difficult to achieve such a high conversion efficiency, so it is necessary to have good exhaust heat management, increase the operating temperature of the SCR catalytic converter, and achieve efficient NOx emission conversion

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