Method and system capable of utilizing methyl alcohol as additional energy to realize regeneration of particle catcher

Abstract

The invention relates to a method and a system capable of utilizing methyl alcohol as additional energy to realize regeneration of a particle catcher. The system comprises a DOC postprocessor mountedon the exhaust pipe of an engine, a DPF postprocessor, a methyl alcohol injection system mounted on the upstream of the DOC postprocessor, a first exhausting temperature sensor positioned between theDOC postprocessor and the DPF postprocessor, a second exhausting temperature sensor positioned on the downstream of the DPF postprocessor, and a differential pressure sensor, wherein the joints of thedifferential pressure sensor are positioned on the upstream and downstream of the DPF postprocessor separately; and the differential pressure sensor is used for measuring the difference value of front and rear pressure of the DPF postprocessor. Methyl alcohol is sprayed into the exhausting pipe in front of the DOC postprocessor and has oxidation reaction under the catalytic action of DOC; and heat released during reaction can increase the exhausting gas temperature to realize active regeneration of DPF.

Description

Technical field: [0001] The invention relates to a diesel engine aftertreatment technology, and further relates to a method and system for realizing the regeneration of a particle trap with methanol as an external energy source. Background technique: [0002] Due to the diffusion combustion mode of the diesel engine, its exhaust contains a large amount of particulate matter (PM). Usually, the in-cylinder combustion and particle oxidation catalyst are optimized to achieve the purpose of reducing particulate matter emissions. With the increasingly stringent emission regulations, the collection efficiency of the particle oxidation catalyst can no longer meet the requirements for use, so a particle filter ( DPF) to achieve high-efficiency capture of particulate matter, but it needs to be regenerated when the carbon load reaches a certain limit. The commonly used regeneration methods include active regeneration, which uses external energy to make the exhaust temperature reach th...

AI Technical Summary

Problems solved by technology

Usually, the in-cylinder combustion and particle oxidation catalyst are optimized to achieve the purpose of reducing particulate matter emissions. With the increasingly stringent emission regulations, the collection efficiency of the particle oxidation catalyst can no longer meet the requirements for use, so a particle filter ( DPF) to achieve efficient capture of particulate matter, but when the carbon load reaches a certain limit, it needs to be regenerated

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