INVESTIGATION ON MULTI-CYLINDER S.I ENGINE USING BLENDS OF HYDROGEN AND CNG

Pravin T. Nitnaware, Jiwak G. Suryawanshi

Abstract: Blending of hydrogen to enhance the combustion properties of CNG during lean burn is investigated. The blends tested were 2, 6, 9, 13 wt % of hydrogen with CNG. Blending is done online to reduce NOx and improvement in performance output. Sequential injection system is used to reduce backfire and improve power output. At 25 % throttle position and 3500 rpm HCNG blends shown 40 % reduction in CO2, 10.5% reduction in HC and 20.5 % reduction in CO2 compared to CNG. There was drastic reduction in carbon based emissions in CNG compared to gasoline due to lower carbon content molecular structure. There is 56 % reduction in NOx for blend of 40HCNG and 30 % improvement in brake thermal efficiency compared to CNG. 15 % power drop is observed due to reduce energy content of charge intake. 20HCNG shown optimum condition with reduction in NOx and carbon based emission and no change in power output compared to CNG.

Keywords: Hydrogen, CNG, Nitrogen Oxides, Advance/Retard, Lean/Rich, EGR

DOI: https://doi.org/10.15623/ijret.2014.0304174