Diesel engine tail gas after-treatment system meeting near-zero emission

Abstract

The invention discloses a diesel engine tail gas after-treatment system meeting near-zero emission. The system integrates the functions of a diesel engine PNA adsorptive NOx catalyst, a Mini-Burner micro burner, an SCRF catalyst, an SCR catalyst, an ASC ammonia trapping system and an electric control system, carries out coordinated treatment on main pollutants PM and NOx in diesel engine tail gas, and can carry out heat management temperature raising on a diesel engine under a low-temperature working condition, and efficient catalytic conversion of the diesel engine after-treatment system is achieved. According to the system scheme, the higher conversion efficiency of NOx can be achieved, the requirement of higher emission regulations is met, and the system is suitable for application and popularization.

Description

technical field [0001] The invention relates to the technical field of exhaust gas aftertreatment, in particular to a diesel engine exhaust aftertreatment system satisfying near-zero emissions. Background technique [0002] With the continuous stringent pollutant emission regulations of diesel engines, the emission limits of nitrogen oxides (NOx) and particulate matter (PM) of diesel engines are close to zero emissions. For the selective catalytic reduction SCR system, an additional heating system is required to increase the emission of nitrogen oxides under low temperature conditions. Therefore, it is necessary to study an exhaust gas heating system with better reliability, more compact space size and lower cost. For particulate filter DPF systems, an additional electronic heating system is required for efficient and reliable regeneration of the DPF. There are many disadvantages in increasing the temperature of the exhaust gas by controlling the fuel consumption in the di...

AI Technical Summary

Problems solved by technology

There are many disadvantages in increasing the exhaust gas temperature by controlling the fuel consumption in the diesel engine. It will consume a large amount of fuel. At the same time, under the conditions of low speed and low load of the diesel engine, the combustion efficiency is low and the fuel consumption rate is high.

Moreover, the energy generated by combustion has to pass through the turbocharger of the diesel engine and the exhaust pipeline, and the energy loss in the middle is large.

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