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This work aims study on the method of NOx reduction and performance enhancement by analysis of MPFI multi-cylinder gasoline engine running on LPG using the gas injection system and vaporized water-methanol induction to the intake manifold. For the generation of vaporized water-methanol, heat from the exhaust gas has been used. Different percentages of water- methanol by mass basis were used with variable engine speed ranging from 2000 to 4500 RPM. The outcomes indicated that as the percentage water-methanol induction level of the engine increased, there is a slight increase in percentage of useful work, while the NOx decreased drastically about 47%. Additionally, the engine brake thermal efficiency gains. The mean gain in the brake thermal efficiency for a 20% water methanol with LPG is approximately 1.5% over the use of LPG without water-methanol induction.

Reducing the emissions and fuel consumption are no longer future goals; instead they are the demands of the day. People are concerned about rising fuel costs and effects of emissions on the environment. Diesel engines are the major contributors to the increased levels of pollutants. In the present work an attempt is made for effective utilization of diesel engine with reduced fuel consumption, smoke density and NOx emissions. This is achieved by some minor modifications in diesel engine so as to run it as LPG-Diesel Dual-fuel engine with LPG (Liquefied Petroleum Gas) (70% Butane + 30% Propane) induction at air intake. The important aspect of LPG-Diesel dual-fuel engine is that, it shows significant reduction in smoke density, NOx emission and improved brake thermal efficiency with reduced energy consumption. An existing 4-S, single cylinder, naturally aspirated, water-cooled, direct injection, C.I. engine test rig was used for the experimental purpose.

Dimethyl Ether (DME), the methanol analog to Diethyl Ether (DEE), was recently reported as a low emission, high quality diesel fuel replacement. Literature review indicates that significant work is not carried out with respect to its performance analysis and in regard to pollution levels. In the present work, the effect of DEE on the performance and emissions of a four-stroke direct injection diesel engine have been studied. Tests were conducted on the diesel engine with different blends of DEE and diesel as fuel. Test results show that 5 % DEE blend gives better performance and low emissions compared to other blends of DEE and diesel fuel. Hence, 5 % DEE can be blended with diesel fuel to improve the performance and to reduce emissions of the diesel engine.