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CO2 emissions from a spark ignition engine operating on natural gas–hydrogen blends (HCNG)

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  • Navarro, Emilio
  • Leo, Teresa J.
  • Corral, Roberto

Abstract

The addition of hydrogen to natural gas could be a short-term alternative to today’s fossil fuels, as greenhouse gas emissions may be reduced. The aim of this study is to evaluate the emissions and performance of a spark ignition engine fuelled by pure natural gas, pure hydrogen, and different blends of hydrogen and natural gas (HCNG). Increasing the hydrogen fraction leads to variations in cylinder pressure and CO2 emissions. In this study, a combustion model based on thermodynamic equations is used, considering separate zones for burned and unburned gases. The results show that the maximum cylinder pressure rises as the fraction of hydrogen in the blend increases. The presence of hydrogen in the blend leads to a decrease in CO2 emissions. Due to the properties of hydrogen, leaner fuel–air mixtures can be used along with the appropriate spark timing, leading to an improvement in engine emissions with no loss of performance.

Suggested Citation

  • Navarro, Emilio & Leo, Teresa J. & Corral, Roberto, 2013. "CO2 emissions from a spark ignition engine operating on natural gas–hydrogen blends (HCNG)," Applied Energy, Elsevier, vol. 101(C), pages 112-120.
    • Handle: RePEc:eee:appene:v:101:y:2013:i:c:p:112-120
    DOI: 10.1016/j.apenergy.2012.02.046
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