Comparison of Emissions from Natural Gas and Gasoline Fuelled Engines - Total Hydrocarbon and Methane Emissions and Exhaust Gas Recirculation Effects 970743

This work investigated the characteristics of both total and methane hydrocarbon emissions from a spark-ignition research engine fuelled with natural gas and gasoline. The engine was operated at a range of equivalence ratios, spark timings and speeds. Measurements were also made during warm-up. The effects of exhaust gas recirculation at stoichiometric operation with special regard to oxides of nitrogen emissions were also investigated in a direct comparison between natural gas and gasoline fuelling at constant engine torque.The main conclusions from this work are that: fuel type and equivalence ratio have major influences on both total hydrocarbon and methane emissions, spark timing affects total hydrocarbon and methane emissions significantly, increasing engine speed decreases total hydrocarbon emissions for both fuels, during cold start and warm-up operations, gasoline emitted a much higher excess of total hydrocarbons at first start compared with natural gas, and exhaust gas recirculation gave lower oxides of nitrogen emissions for natural gas than for gasoline fuelling.


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