Hydrogen Addiction Effect on Methane Mild Condition (Contributo in atti di convegno)

  • Hydrogen Addiction Effect on Methane Mild Condition (Contributo in atti di convegno) (literal)
  • 2005-01-01T00:00:00+01:00 (literal)
Alternative label
  • 1P. Sabia, 1S. Fierro, 2M. de Joannon, 2A. Tregrossi, 1A. Cavaliere (2005)
    Hydrogen Addiction Effect on Methane Mild Condition
    in Combustion and Urban Areas - 28th Meeting of the Italian Section of The Combustion Institute, Naples, 2005
  • 1P. Sabia, 1S. Fierro, 2M. de Joannon, 2A. Tregrossi, 1A. Cavaliere (literal)
  • 1 Dipartimento di Ingegneria Chimica - Università Federico II, Naples - ITALY 2 Istituto di Ricerche sulla Combustione - C.N.R., Naples - ITALY (literal)
  • Hydrogen Addiction Effect on Methane Mild Condition (literal)
  • 88-88104-05-4 (literal)
  • Hydrogen has been declared as the energy vector of the future. But the available systems of production, storage and transport of hydrogen are not still ready to allow for managing this clean fuel in a proper way. Moreover, its high reactivity and a very high calorific power makes hydrogen combustion quite difficult to control. Hence the establishment of an economical and energetic system based on hydrogen technologies still requires some improvements. In the meantime hydrogen has been used in several ways such as \"fuel enhancer\" to promote ignition of low calorific power fuels or in engines characterized by a high level of recirculation (EGR) of exhaust gases . These features are very close to the Mild Combustion conditions that use high dilution and high pre-heated reactants. As matter of fact these working conditions moderate the hydrogen high reactivity and allow for a more controlled use of this fuel. Mild Combustion represents a good trade-off in the passage between an energetic system based on fossil fuel towards hydrogen. On the other hand experimental works on the mild combustion of natural gas pointed out the insurgence of complex dynamic behaviors due to thermo-kinetic temperature oscillations. In practical applications such instabilities strongly reduce the efficiency of combustion processes.Hence the effect of hydrogen addition to the methane combustion in Mild conditions has been studied, with particular focus on the dynamic behavior detected in the past.The experimental analyses were carried out on CH4/O2 system diluted at 90% by N2 in the JSFR used in the previous studies at atmospheric pressure, over a wide inlet temperature (Tin) range (up to 1300K), and a carbon fuel to oxygen feed ratio (C/O) range from values very close to zero to 1.2. Hydrogen concentration (H2,IN) was discretely varied from 0.25% to 0.9%. The experimental results showed that the higher inlet hydrogen content, the higher the increase of the system reactivity and a more significant reduction of the area in the Tin-C/O plane where thermo-kinetics oscillation were observed. However the hydrogen addition did not seem to affect significantly the typology of oscillations. The experimental Tin-C/O maps were then compared with the numerical ones, obtained with different kinetic mechanisms available in literature. An overall good agreement was found between experimental and numerical data. The evolution of the oscillations region and the increase of reactivity due to the hydrogen addition were quite well predicted. (literal)
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