Simulation And Experimental Study On Diesel Particular Filter Regeneration

To meet the legislated current and future stringent emission requirements,today's vehicles are forced to use a variety of components and systems to reduce the engine out emissions within the exhaust system.Diesel engines will need to be equipped with one or more of a variety of different aftertreatment components,including Selective Catalytic Reduction?SCR?,Ammonia Slip Catalyst?ASC?,Diesel Particulate Filter?DPF?,NOx Storage Reduction?NSR?,and Diesel Oxidation Catalyst?DOC?.Among which DPF is a necessary component to reduce particulate emissions.In this paper,GT-POWER,a professional simulation software in the internal combustion engine field is used to build a model of D25 diesel engine and a wall-flow diesel particular filter.DOC assisted DPF regeneration method is used in this model.Simultaneously,contrapose the possibility of internal structure change of DPF after regeneration,a bench test is carried out to evaluate the influence of the composition of exhaust gas after the rege neration of DPF.In the simulation part,several factors are taken into account which may influence the wall temperature and energy efficiency during DPF regeneration1 The simulation work researched from five aspects that will affect the DPF wall temperature include:exhaust mass flow rate,initial particulate density,cell density,fuel injection quantity and fuel injection duration.2 Three aspects are taken into account to analyze the factors that may influence energy efficiency of secondary fuel injection system,exhaust mass flow rate,DPF inlet temperature and initial particulate density.A bench test is carried out to contrast the constituents of exhaust gas with and without DPF,and,after DPF regeneration.The results show that:1 DPF can reduce particulate matter emissions from diesel engine by about70%.2 The amount of particulate number emissions are significantly reduced after DPF is equipped.3 DPF does not cause too much impact on NOx emissions4 The content of NO₂ in NOx after installing DPF will decrease,which is more obvious after the regeneration of DPF.5 When the DPF is installed,CO emissions of the diesel engine is increased.6 In most cases,DPF will not reduce HC emissions,but at the rated condition HC emissions will be reduced...