Pyrolysis and oxidation of unsaturated and species

Abstract

Abstract In this work we analyse and study several experimental data on pyrolysis, partial oxidation and combusion of C 2 and C 3 acetylenics as well as allene and ketene. These data, already presented in the literature, refer to turbulent flow 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 some data of ethylene and propylene pyrolysis are also discussed. C 2 and C 3 unsaturated species are always present as important intermediates in combustion processes and their reactions play a crucial role in explaining the formation of aromatic and polyaromatic species in sooting flames. A detailed kinetic scheme able to describe the partial oxidation and the combustion of hydrocarbon mixtures up to commercial gasolines and liquid fuels is extended and more carefully validated on these sets of experimental data. The key reactions are discussed and compared with literature kinetic data. Moreover, this kinetic analysis is very useful for the study of `mild combustion' in the intermediate temperature region where the flameless combustion seems to offer the great advantage of a reduced formation of toxic components such as nitric oxides, polyraromatics and soot.