Exhaust Gas Regeneration System Design in Diesel Particulate Filter

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Addis Ababa University


In this study the diesel vehicle engine exhausts emissions, particularly Diesel Particulate Matter and its impact on health and environment is discussed briefly. The filtration method used to removes this particulate matter from diesel exhaust gases is using wall flow diesel particulate filter through physical filtration. The filter designed for this application has a honeycomb structure with long parallel flow channels and the opposite ends of adjacent channels are alternatively capped, forcing gas to flow through porous side walls leaving soot behind on the surface of the walls that would result in an adverse impact on engine performance. Therefore the Diesel particulate filter regeneration system strategy (passive type), which promotes the oxidation of carbon soot trapped in diesel particulate filter under normal engine operation condition is applied in this study. This is achieved by catalyst coating on the filter cell membrane to facilitate the soot trap combustion. in addition, Filter design parameters like filter size and filter cell configuration which is responsible for the save regeneration are identified. The mass flow rate of Diesel Particulate Matter Emission from diesel vehicle engine under different operation condition (speed and loading) is considered by using weighting factor for each operation point. Mass based particulate matter emission from diesel engine obtained in this study is 36.01 (g/hr). for filter with 80% ,85% ,90% filtration efficiency of DPF: the Mass of PM released to atmosphere in (g/bkw.hr) are 0.082, 0.062, 0.041 respectively, where the Europe PM emission limit standards is achieved above 85% of filtration efficiency . The pressure drop across Diesel Particulate Filter is predicted (2.81kpa) using soot layer thickness model. Finally, regeneration behavior of diesel particulate filter using comsol multi physics by coupling the exhaust gas flow(maximum flow velocity 4.2m/s),Particulate matter concentration distribution in DPF model [maximum 12.5 mil (mol/m3) and 5mil(mol/m3) ]and the filter wall temperature distribution(500 and 705 in K) due to soot trap oxidation reaction in DPF. From the passive regeneration system applied the catalyst coated on the filter porous membrane initiates the burning-off particulate matter in filter channel , reduces the oxidation temperature of soot trap and keeps clean the diesel particulate filters under normal engine operation condition.



Mechanical design Stream