Performance Testing of Multicylinder Compressed Ignition Engine with Dual Fuel Mode of CNG with Biodiesel and Diesel
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Abstract
The experimental investigation was performed on a multicylinder CI engine used for off-road applications with dual fuel modes of CNG-biodiesel, CNG-diesel and CNG-biodiesel-diesel. The study aims to identify the maximum possible replacement of liquid fuel by CNG and investigate the engine's performance and emission characteristics under dual fuel mode. Biodiesel used for the study is prepared from waste cooking oil using the transesterification method. Engine performance and emission characteristics are tested for D100, B100 and B60 fuels with CNG supplied in various quantities up to the engine can take at respective operating conditions. The test was conducted at a constant speed of 1500 rpm and varying loads of 10%, 25%, 50%, 75% and 100% of full load. The liquid fuel replacement by CNG is obtained in the range of 54% at low loads and 84% at high loads. The brake thermal efficiency is decreased for dual fuel mode at low loads but improved at high loads. A substantial reduction in the smoke and NOx emissions and an increase in CO and HC emissions were observed for the dual-fuel mode. The biodiesel-CNG dual fuel mode significantly reduces greenhouse gas emissions.
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