Pollutant Reduction Techniques Used for Nonroad Combustion Ignition Engines: Fid-Bau Portal

Pollutant Reduction Techniques Used for Nonroad Combustion Ignition Engines

Suratwala, Darshit P. / Harpale, Varsha / Khurge, Deepti

Combustion ignition (CI) engines for nonroad vehicles such as railway engines and marine engines provide greater output power with better fuel efficiency at a low cost. This has led to a rise in the use of such engines and made them popular over the decades. At the very exhaust of these engines, dangerous pollutants emitted are nitrogen oxides (NOx), hydrocarbons (HC), carbon monoxide (CO) and particulate matter (PM). These emissions are proving to be fatal for nature as well as human health. This paper focusses on the importance of nonroad combustion ignition engines of power 560 kW or more, its effects on environment and reviewing previous solutions. The upcoming challenges and new ideas to reduce these pollutants are also discussed with adherence to the new environmental norms and policies adopted by different countries. Currently, aftertreatment technology is prominent in reducing these pollutants but as these policies are getting stringent, will this technology be efficient in the long run? Therefore, possible improving factors are suggested in this paper to extract 90% or more efficiency from the aftertreatment systems. The pollutant reduction methods that are reviewed are exhaust gas recirculation (EGR), lean NOx trap (LNT), diesel oxidation catalyst (DOC), diesel particulate filter (DPF) and selective catalytic reduction (SCR). Recently, many scientists are trying to find different alternate fuels such as blends of biodiesel and develop electric powertrains to eliminate these pollutants. The sole purpose of this review is to concentrate on the current capabilities and the possible improvements of the existing pollutant reduction techniques with respect to nonroad diesel engines and also provide a future perspective with the help of alternate fuels.