Hydrogen Interaction on the Methane Oxidation Kinetics (Contributo in atti di convegno)

  • Hydrogen Interaction on the Methane Oxidation Kinetics (Contributo in atti di convegno) (literal)
  • 2007-01-01T00:00:00+01:00 (literal)
Alternative label
  • *P. Sabia, *M. de Joannon, **E. Romano, **A. Cavaliere (2007)
    Hydrogen Interaction on the Methane Oxidation Kinetics
    in 30th Meeting on Combustion, The Italian section of the Combustion Institute, Ischia (Napoli), June 20-22, 2007
  • *P. Sabia, *M. de Joannon, **E. Romano, **A. Cavaliere (literal)
  • *Istituto di Ricerche sulla Combustione- CNR **Dip. Ingegneria Chimica, Università Federico II, Napoli (literal)
  • Hydrogen Interaction on the Methane Oxidation Kinetics (literal)
  • 978-88-88104-07-2 (literal)
  • Raffaele Ragucci (literal)
  • The use of very specific operative conditions in combustion systems, essentially suggested by the need of reaching high level of sustainability, often highlights particular behavior otherwise hidden by fast conversion processes, characteristic of traditional systems. This can change the point of view of well assessed knowledge and imposes two questions. The first is the characterization of the process in the current operative conditions and the second one is the analysis of traditional systems in the light of the obtained results in order to achieve a comprehensive representation in terms of range of parameters explored. An example is represented by methane combustion in homogeneous conditions. When this process occurs in presence of high dilution level, dynamic behavior can be detected at high temperatures for a relatively wide fuel/oxygen ratio. These operative conditions denote Mild Combustion process, an innovative combustion technology characterized by a very low environmental impact. Such dynamic behavior, resulting in stable or unstable temperature oscillations, was well known for hydrocarbon fuels heavier than butane but they have never been detected for small hydrocarbons. Therefore the temperatures and mixture compositions ranges in which they occur have been well identified by means of both experimental and numerical approach, with the aim to avoid instabilities in practical applications. Moreover, the thermo-kinetic mechanism responsible of such phenomenologies has been pointed out, thus suggesting possible way to reduce or make the region of temperature oscillations disappear. In previous work hydrogen has been added to the CH4/O2/N2 system in order to value the chance of avoiding instability problems. It resulted in a reduction of the inlet conditions for which instabilities occur and also a shift of the dynamic region and of the \"low reactivity\" region, identified for fuel rich mixtures at high Tin, towards lower Tin. This paper enriches the framework by analyzing the hydrogen interaction on the methane oxidation reaction pathways and on the reaction paths responsible of the insurgence of temperature oscillations. (literal)
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