Natural gas postprocessor assembly conforming to national VI standard

Abstract

The invention aims to provide a natural gas postprocessor assembly conforming to the national VI standard to effectively reduce the emission of pollutants in tail gas and meet the national VI standard. The postprocessor mainly comprises a packaging unit, a packaging cavity is formed in the packaging unit, a front carrier is arranged at the front end of the packaging cavity, a rear carrier is arranged at the rear end of the packaging cavity, the front carrier and the rear carrier are both honeycomb carriers, Pt, Pd and Rh precious metal coatings are coated in holes of the front carrier, and Ptnoble metal coatings are coated in holes of the rear carrier; an air inlet pipe assembly is communicated with the front end of the packaging unit; and an air outlet pipe assembly is communicated withthe rear end of the packaging unit.

Description

technical field [0001] The invention relates to the field of natural gas exhaust systems, in particular to a natural gas post-processor assembly conforming to the National VI standard. Background technique [0002] With the rapid growth of the number of motor vehicles, the air pollution in large and medium-sized cities in my country has gradually transformed into a composite pollution dominated by soot and motor vehicle emissions, and NOx has become the most prominent air pollution problem in many cities. Motor vehicle emissions are one of the main sources of NOx in the urban atmosphere. In the NOx emitted by motor vehicles, the contribution of heavy-duty commercial vehicles is becoming more and more prominent, accounting for more than 60%. Although the number of heavy-duty commercial vehicles is not high, their single-vehicle emissions are high. Reducing emissions from heavy-duty commercial vehicles has become the top priority for reducing emissions from motor vehicles. I...

AI Technical Summary

Problems solved by technology

[0004] One is that the post-processor assembly cannot meet the requirements of the National VI emission standards;

[0005] Second, the internal structure design of the post-processor assembly is unreasonable, and the airflow distribution at the carrier inlet is uneven, resulting in low utilization of some carriers and affecting the NOx conversion efficiency;

[0006] The third is that the internal temperature loss of the post-processor assembly is large, which cannot reach the reaction temperature (500°C) required by the pollutants, and the conversion efficiency is low, causing the pollutants to exceed the emission limit

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