1 “Performance Analysis of Methanol-Propanol-Diesel Blends for reduction of NOx Emission” Dr. A. B. Kanase-Patil a# , V.S. Tekade b , S .K. Sutar b a Associate Professor, Department of Mechanical Engineering, STES’ Sinhgad College of Engineering, Pune-411041, Maharashtra, India. b P.G. Students, Department of Mechanical Engineering, STES’ Sinhgad College of Engineering, Pune- 411041, Maharashtra, India. # Corresponding Author: amarbkanase@yahoo.co.in, Mob No. 8888394463. Abstract Single cylinder engines are widely used in India for different applications such as water pumping in agricultural sector. The day by day increasing petroleum fuel prizes encourages shifting towards alternate fuels which must be generated from biomass or biological products. Alcohols are the promising fuel which promises the alternative to petroleum fuels. These alternative fuel used are use as a replacement to diesel requires slight modification which provides same result as that of diesel engine. In this paper, Methanol-Propanol-Diesel blend is used as an alternate fuel in single cylinder diesel engine and performance analysis has been studied at different brake power. Different types of alcohol blends with different composition have been studied. The Methanol- Propanol-Diesel blend with composition D6M2P2 has been selected for performance and emission analysis. The performance parameters such as injection angle varied from -1 0 to -10 0 BTDC and compression ratio from 14.09:1 to 18.09:1 respectively to study the emission and performance parameter. The simulation of performance parameter of single cylinder diesel engine has been carried out in engine simulation software GT Power 7.2. The simulation model has been validated with experimental performance and emission result of single cylinder diesel engine. The NOx emission reduced by Methanol-Propanol-Diesel blend compare to diesel fuel at full load. The brake efficiency of single cylinder diesel engine with Methanol-Propanol-Diesel blend increased by 2% to 6% at 100% load compare to diesel fuel. The modification in single cylinder diesel engine with injection angle -10º BTDC and compression ratio 18.09:1 shows better performance. 1. INTRODUCTION Diesel engines are the most commonly used Internal Combustion (IC) engines that are widely used in various sectors such as agriculture, transportation and industry. Diesel engines produce smaller amount of Carbon Monoxide (CO), Hydrocarbons (HC) and Carbon Dioxide (CO 2 ) emissions than gasoline powered engines, mainly due to the lean nature of air-fuel mixtures and good fuel efficiency. The absolute contribution of diesel vehicles to total pollutants and greenhouse emissions has been growing because of their increasing numbers. The combustion related pollutants, such as HC, NOx, SO 2 , CO, CO 2 became eye opener to many nations and they initiated programs to control pollutions. Day by day increasing petroleum fuel prizes encourages shifting towards alternate fuels which should generate from biomass or biological products. Alcohols are the promising fuel which promises the alternative to petroleum fuels. Single cylinder diesel engines come under Off-Road engine and lead to significant