Internal heating of steam flow by means of MILD Combustion (Contributo in atti di convegno)

Type
Label
  • Internal heating of steam flow by means of MILD Combustion (Contributo in atti di convegno) (literal)
Anno
  • 2010-01-01T00:00:00+01:00 (literal)
Alternative label
  • Sorrentino G., de Joannon M., Cavaliere A. (2010)
    Internal heating of steam flow by means of MILD Combustion
    in 8th International Symposium on High Temperature Air Combustion and Gasification, Poznan, July 5-7 2010
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Sorrentino G., de Joannon M., Cavaliere A. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Istituto di Ricerche sulla Combustione- CNR Dip. Ingegneria Chimica, Universit√† Federico II, Napoli (literal)
Titolo
  • Internal heating of steam flow by means of MILD Combustion (literal)
Abstract
  • The high temperature technology in which energy is added to the gas stream in a high pressure device is a process usually used in the field of power plants. On the other hand, the case in which this process is characterized by a very homogeneous thermal field with a low temperature increase, it has been only proposed in some previous works. Therefore tThis type of process is suitable for application of Mild MILD Combustion taking into account also that the autoignition of the mixture is favored by high values of the pressure. MILD Combustion occurs when highly pre-heated and very diluted reactants are taken into account, thus it refers to well-identified inlet range of parameter. In this paper an internal heating system of a steam flow, based on Mild MILD Combustion, has been characterized through numerical analysis of opposed jets of steam/oxygen mixture versus a hot fuel stream. The oxidant jet has a low content of oxygen to ensure temperature homogeneity and control. This structure straightly supports the occurrence of a \"Diffusive-Ignition\" process. Distributions of temperature and heat release rate as a function of the mixture fraction are evaluated for different values of the external parameters, i.e. oxidant dilution, pressure and strain rate. In particular, it has been shown that, varying the jets dilution degree, the temperature distribution remains constant in a wide range of mixture fraction, in particular it corresponds to the fuel inlet temperature. This implies that the increase of temperature due to combustion is coincident with the level of fuel preheating. The paper remarks the main characteristics of diffusive ignition processes showed also in previous papers. In fact, differently from traditional diffusion flames, they are characterized by Pyrolysis depression and Flame thickening. In general the results obtained in this internal heating system are consistent and extend those reported in the literature for the characterization of Mild combustion processes. (literal)
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