Authors : Ranbir Singh and Sagar Maji
Abstract: This study presents a detailed experimental research carried out on a twin-cylinder, four-stroke direct injection compression ignition engine converted to operate on dual fuel mode using Compressed Natural Gas (CNG) as the primary fuel. A venturi mixer is designed by developing a computer program in EES (Engineering equation solver) Software and then fabricated for mixing proper amount of CNG with air before admission to engine cylinder. Data for analysis of performance parameters such as brake thermal efficiency and brake specific fuel consumption was recorded both for straight diesel and dual fuel modes of operations. Engine running cost analysis was carried out on the basis of fuel consumption cost for 1 h of continuous operation of diesel engine at a particular load for both the modes. Experimental results indicate that with an increase in CNG substitution rate, brake thermal efficiency of CNG-diesel dual fuel engine is low at low loads but it is remarkably high at higher engine loads. Brake specific fuel consumption for dual fuel mode is better than pure diesel mode as the rate of CNG substitution was increased. The cost of fuel for running a CNG-diesel dual fuel engine is found less than that for pure diesel engine as the CNG substitution rate increases. In this study, 90% saving in consumption of conventional diesel fuel is achieved by its replacement with cheap and abundantly available CNG fuel.
Ranbir Singh and Sagar Maji, 2012. Dual Fueling of a Twin-Cylinder Compression Ignition Engine with Diesel and CNG. Journal of Engineering and Applied Sciences, 7: 90-99.