Impacts of Gas Composition on Knocking Tendency and Concept to Suppress Knocking Due to Change in Gas Quality

Abstract

Investigation for effects of fuel gas composition on knocking tendency in gas engines revealed that addition of hydrogen and carbon dioxide with a same volumetric amount to methane showed no impact on the knock resistance of the ternary-component fuels. This is due to the fact that positive and negative effects of hydrogen and carbon dioxide addition on knocking tendency cancel out each other. Furthermore, results of chemical equilibrium calculations showed that selective steam reforming of heavier hydrocarbons in natural gas is effective to suppress knocking due to change in gas quality.