Effect of Using Dpf, Doc and Ncc Aftertreatment Devices on Emissions of Diesel Engine

Abstract

To meet more and more stringent emission standards, both the in-cylinder and after-treatment is done in engines by varying the injection pressure, timing, fuel additives, combustion chamber, exhaust gas recirculation; and adopting Diesel particulate filter (DPF), Diesel oxidation catalyst (DOC), Selective Catalytic reduction (SCR), NO_x traps etc respectively. In this study, extensively three aftertreatment devices viz; diesel particulate filter, diesel oxidation catalyst and new catalytic converter were used. Experiments were conducted on a CI engine with neat diesel fuel at all the loads and fixed speed. Test runs were conducted by adopting DPF, DOC, New catalytic converter (NCC) individually and in combinations. At 6 kg loads, the thermal efficiency of engine was found to be 21.45%. Overall comparison of all the results, the least emission level was recorded when engine is operated at sixty percent full load with combined DPF, DOC and new catalytic converter; with emissions values were HC 40 ppm, CO 0.1 %, and NO 332 ppm.