Abstract
Abstract Amongst popular bio fuels is producer gas, or wood gas. It is a combustible gas derived from the thermo chemical conversion of woody biomass and generally composed of a mole fraction of 18–20% H 2 , 18–20% CO, 2–3% CH 4 , 12% CO 2 and 48–50% N 2 .The composition of producer gas can vary depending on the inherent production technology. Five different compositions of producer gas were chosen from literature in order to evaluate their knocking characteristics. These compositions were simulated using a gas blending system and the methane number was evaluated on a CFR F-2 engine. The methane number of the chosen producer gas compositions ranged from 54 to 131. Further, the effects of the specific concentrations of CO 2 and H 2 were quantitatively evaluated. It was determined that addition of CO 2 increases the critical compression ratio while H 2 decreases it. Overall, the effect of CO 2 on changing the critical compression ratio was found to be over twice that of H 2 .
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