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Keywords:

  • initial temperature;
  • methane;
  • minimum ignition energy;
  • gas combustions;
  • combustion temperature

This study was aimed at determining the effects of initial temperature on minimum ignition energy (MIE) and combustion parameters of methane-air mixtures. A series experiments were carried out with an ignition energy measurement system and two combustion vessels (5 L and 20 L). The results described in this article include: (a) the MIE of methane-air mixtures reached their lowest values at a concentration of 8.5%, instead of 9.5% stoichiometric concentration, (b) the MIE of methane-air mixtures decreases as initial temperature increases, (c) the combustion temperature and maximum rate of combustion temperature rise of methane-air mixtures decrease as initial temperature increases, and (d) the combustion pressure of methane-air mixtures decreases as initial temperature increases. © 2013 American Institute of Chemical Engineers Process Saf Prog 32: 37–41, 2013