Study On Synergistic Mechanism Of Particle Capture And Microwave Heating Regeneration In Rotating Diesel Particulate Filter

In recent years,the automotive industry has flourished and domestic cars have reached hundreds of millions.The huge number of such vehicles has brought about many environmental problems,so it is necessary to strictly limit the emission of automobile pollutants.Among them,diesel engines are used as power sources for various construction machinery,the emissions of particulate are very large.In recent years,regulations related to the emissions of particulate have become increasingly stringent,and it has become impossible to rely solely on in-machine purification technology to meet emission standards.It needs to be improved by post-treatment purification technology.In this context,particle trapping technology has been developed to solve this problem better.The device used is a particulate filter.This paper focuses on the rotational diesel particulate filter(R-DPF),the biggest advantage of which is the function of continuous regeneration.but its filtration and regeneration performance needs to be improved.For this purpose,this paper relies on the National Natural Science Foundation project "Pd / graphene catalytic rotational diesel particulate filter partition microwave heating regeneration and thermal-electric-chemical-mechanical coupling collaborative optimization research [51676066]".It bases on the methods of computational fluid dynamics and gray correlation analysis to study its flow field characteristics and regeneration performance.The main work and innovations of this paper are as follows:(1)The mathematical model of flow field characteristics during capture of R-DPF was established.The velocity distribution,pressure distribution,temperature distribution,and turbulent kinetic energy distribution of trapping process were studied.The effects of different exhaust flow rate,diameter ratio,expansion angle and filter length on flow velocity uniformity were obtained.(2)The microwave heating regeneration model of the filter unit was established.The velocity distribution,pressure distribution,turbulent kinetic energy distribution,temperature and concentration transients of carbon particles during combustion were studied.The effects of different exhaust gas temperature,exhaust oxygen content,initial particle concentration and microwave heating power on regeneration performance were obtained.(3)The gray correlation weights of exhaust gas temperature,diameter ratio,expansion angle,filter length on flow velocity uniformity,regeneration performance and pressure drop of trap-regeneration balance point were studied.The capture-regeneration volume ratio under different working conditions was obtained.The influence parameters of regeneration performance and pressure loss of the filter unit provide a reference for the coordinated optimization of particle trapping-microwave heating regeneration of R-DPF.