Pollutant reduction and abatement by means of MILD combustion (Contributo in atti di convegno)

  • Pollutant reduction and abatement by means of MILD combustion (Contributo in atti di convegno) (literal)
  • 2002-01-01T00:00:00+01:00 (literal)
Alternative label
  • A. Cavaliere, M. de Joannon (2002)
    Pollutant reduction and abatement by means of MILD combustion
    in The Second Mediterranean Combustion Symposium, Sharm El-Sheikh, Egypt, 6-11 gennaio 2002
  • A. Cavaliere, M. de Joannon (literal)
  • Plenary lecture su invito (literal)
  • Dipartimento di Ingegneria Chimica, Università Federico II, Napoli, Italia Istituto di Ricerche sulla Combustione-CNR, Napoli, Italia (literal)
  • Pollutant reduction and abatement by means of MILD combustion (literal)
  • The objective of the paper is to review the potentialities of the mild combustion both in \"clean\" thermal generation as well as in the abatement of the pollutants along the flue gas stream of a primary combustion system. The aim of the paper is to investigate the major species either organic or inorganic, namely carbonaceous material, unburned hydrocarbons , nitrogen oxides and sulphur oxides. In order to stress the general character of the aspects dealt in the paper, a classification of the possible combustion processes relevant along the whole fuel transformation is given. In particular \"clean\", \"cleaning\", \"clearing\" combustion processes are identified a convenient categorization in relation to the incorporation of pre-combustion or post-combustion units in the main combustion systems The definition of the mild combustion is also preliminarily given in order to give a more rigorous framework to the review and to avoid ambiguity. The main topics dealt in the paper pertains the asymptotic behavior of the soot evolution in different combustion process contiguous to the mild combustion. First of all the soot yield in premixed flames as well as in shock tube are analyzed in an intermediate temperature range. It is shown too that the presence of the dilution does not allow to stabilize any diffusion flames for whatever stretching fluid-dynamic pattern and that this means in turns that soot formation is depressed. The oxidation of soot as well as other hydrocarbons is discussed on the ground of the possible radical pools generated in the mild combustion. Reburning and selective catalytic reduction of nitrogen oxides, analyzed in relation to the outlet temperature, are also shown to be effective under the mild conditions presented in the paper for temperature around 1000°C. Finally the evolution of sulfur oxides in combustion systems is briefly analyzed taking into account the possible sulfur-carbon cleavage. A peculiar sulfur removal strategy, based on the calcium oxide cenoshere formation is analyzed as one of the most promising technology of clearing combustion. (literal)
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