Pyrolysis and oxidation of unsaturated C-2 and C-3 species

In this work we analyse and study several experimental data on pyrolysis, p artial oxidation and combustion of C-2 and C-3 acetylenics as well as allen e and ketene. These data, already presented in the literature, refer to tur bulent how reactors, jet stirred reactors (JSRs) and shock tube experiments and span wide ranges of concentration, pressure and temperature. In order to stress the importance of condensation reactions of unsaturated species s ome data of ethylene and propylene pyrolysis are also discussed. C-2 and C- 3 unsaturated species are always present as important intermediates in comb ustion processes and their reactions play a crucial role in explaining the formation of aromatic and polyaromatic species in sooting flames. A detaile d kinetic scheme able to describe the partial oxidation and the combustion of hydrocarbon mixtures up to commercial gasolines and liquid fuels is exte nded and more carefully validated on these sets of experimental data. The k ey reactions are discussed and compared with literature kinetic data. Moreo ver, this kinetic analysis is very useful for the study of 'mild combustion ' in the intermediate temperature region where the flameless combustion see ms to offer the great advantage of a reduced formation of toxic components such as nitric oxides, polyraromatics and soot. (C) 2000 Elsevier Science I nc. All rights reserved.