Vol-3 Issue-2 2017 IJARIIE-ISSN(O)-2395-4396 4954 www.ijariie.com 5025 EFFECT OF VARIOUS PARAMETERS ON PERFORMANCE AND EMISSION OF DIESEL-LPG DUAL FUEL ENGINE Nikunj G. Nimbark 1 , Dr. Pravin P. Rathod 2 , 1 PG Student, Mechanical Engineering Department, Government Engineering College, Bhuj 2 Principal, Government Engineering College, Bhuj ABSTRACT The conventional petroleum fuels for internal combustion engines are depleting rapidly, due to increase in the vehicular population. Moreover, these fuels cause serious environmental problems by emitting harmful gases into the atmosphere. Generally, pollutants released by engines are CO, NOx, Unburnt hydrocarbons, smoke and limited amount of particulate matter. At present, alternative fuels like methyl esters of vegetable oil (commonly known as biodiesels), alcohols etc. which are in the form of liquid and hydrogen, acetylene, CNG, LPG etc. in gaseous fuels are in the line to replace the petroleum fuels for IC engines. Based on the literature available dual fuel engine gives better performance compared to conventional engines. Literature also shows that LPG is most suitable gaseous fuel for dual fuel internal combustion engine. In dual fuel engine flow rate of LPG decreases. It causes dripping of diesel while injecting into the cylinder. To avoid dripping injection pressure needs to be increased. Injection pressure of 140 bar was found optimum from 120, 130, 140, 150, 160 bar. At 140 bar performance and emission test were conducted for LPG flow rates of 2, 3, 4 and 5 LPM. The results shows that the LPG flow rate of 4 LPM in dual engine gives better performance compared to diesel engine. It also shows that the emission also reduces with 4 LPM flow rate of LPG in dual fuel engine compared to diesel engine and other LPG flow rates in dual fuel engine. Keyword: - Dual fuel engine, injection pressure, LPG flow rate, percentage energy substitution (PES), performance parameters, emission parameters. 1. INTRODUCTION Over few decades, a lot of research has gone into use of alternative fuels in IC engines. Vegetable oils seem to be a forerunner as they are renewable and easily available. In an agricultural country like India use of vegetable oil would be economical because of large productivity and reduced dependability on import of petroleum products [13]. But because of high viscosity and poor atomization of straight vegetable oils leads to improper mixing and causes improper combustion. Further to reduce viscosity problem researchers went for biodiesels of vegetable oils. The cost of production and performance losses shows other alternative to use gaseous fuels as alternative fuels in IC engines. One approach in this direction is to utilize the gaseous fuels like biogas, LPG (liquefied petroleum gas), LNG (liquefied natural gas), hydrogen and acetylene gas. They have a high self-ignition temperature; hence they cannot be used directly in diesel engines [8]. 1.1 Gaseous Fuels Gaseous fuels are the best suited for IC engines since physical delay is almost nil. However, as fuel displaces equal amount of air the engines may have poor volumetric efficiency. There are quite few gaseous fuels that can be used as alternative fuels. Gaseous fuels are the most convenient requiring the least amount of handling and simplest and most maintenance free burner systems.