Automotive vehicles emit several exhaust gases and pollutants. The largest part of these gases consists of nitrogen (N 2), water vapor (H 2 O) and carbon dioxide (CO 2) these are not toxic. Harmful gases i.e carbon monoxide (CO) produced because of incomplete combustion, nitrogen oxides (NOx) generated at high temperatures, hydrocarbons (HC) obtained from unburnt fuel, particulate matter (PM, mostly soot) and oxides of sulphur (SOx) due to sulphur content in fuel, are referred as pollutants. India's Emission Standard were formulated in 1991 has reached today to direct transition to BS VI from BS IV norms. This decision to leapfrog fuel standards has managed to disrupt oil and auto Industry. In this paper challenges faced by these industries for this transition based on technical understanding are discussed. For diesel engines diesel particulate filter for moving to BS V and Selective Catalytic Reduction for BS VI is critically analyzed. For S.I engines technologies that are likely to be commercialized which will help vehicles to comply with BS VI norms are explained. Technology up gradation, its validation and assimilation of this technology by
In compliance of the stringent Bharat Stage VI emission norms control of particulate matter in diesel engine exhaust emission is currently achieved through diesel particulate filter, catalytic convertors, baffle filters of various designs. In the present research a device comprising of a spiral duct with increasing cross sectional area over the length is designed. The duct has a lining of heat resistant and porous material fixed along the inside walls. The device is fitted at the tail pipe of compression ignition engine driven vehicle through an inlet pipe of engine exhaust with outlet connected to the tail pipe of the exhaust system. This device will collect the particulate matter in the heat resistant porous lining along the walls of the spiral thus reducing the particulate matter. The spiral flow design was simulated and was found to be in line of acceptance of flow parameters. The developed sleek design can be easily retrofitted in the existing fleet of vehicles making them compliant for stringent statuary emission norms.
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