http://www.cnr.it/ontology/cnr/individuo/prodotto/ID189994

Methane auto-ignition delay times and oxidation regimes in MILD combustion at atmospheric pressure (Articolo in rivista)

Type

Prodotto della ricerca (Classe)
Articolo in rivista (Classe)

Label

Methane auto-ignition delay times and oxidation regimes in MILD combustion at atmospheric pressure (Articolo in rivista) (literal)

Anno

2013-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.1016/j.combustflame.2012.09.015 (literal)

Alternative label

Pino Sabia, Mariarosaria de Joannon, Antonio Picarelli, Raffaele Ragucci (2013)
Methane auto-ignition delay times and oxidation regimes in MILD combustion at atmospheric pressure
in Combustion and flame; Elsevier, Amsterdam (Paesi Bassi)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Pino Sabia, Mariarosaria de Joannon, Antonio Picarelli, Raffaele Ragucci (literal)

Pagina inizio

47 (literal)

Pagina fine

55 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url

http://www.sciencedirect.com/science/article/pii/S0010218012002763 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

160 (literal)

Rivista

Combustion and flame (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo

1 (literal)

Note

ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

Istituto di Ricerche sulla Combustione - CNR, Naples, Italy Istituto di Ricerche sulla Combustione - CNR, Naples, Italy Dipartimento di Ingegneria Chimica, Università Federico II, Naples, Italy Istituto di Ricerche sulla Combustione - CNR, Naples, Italy (literal)

Titolo

Methane auto-ignition delay times and oxidation regimes in MILD combustion at atmospheric pressure (literal)

Abstract

MILD/oxy-fuel combustion is proving to be a reliable technology for clean and efficient energy production systems. It is by now established that the related operative conditions drastically change the combustion kinetics and the relative weight of kinetics and fluid-dynamics involved in the process. Thus a fundamental analysis of single sub-processes involved in fuel oxidation under MILD combustion conditions is needed to make easier the tuning and control of real systems in a wider range of working conditions, thus allowing for the spread of such a technology over a broader industrial scale. Such a work is devoted to the characterization of combustion regimes and the evaluation of auto-ignition delay times of methane in highly diluted and pre-heated conditions at atmospheric pressure in a one-dimensional flow reactor. Experimental tests have been carried out changing the mixture inlet temperature from 1100 up to 1400 K, as well as the mixture carbon/oxygen feed ratios from fuel ultra-lean up to rich conditions. Mixtures are diluted in nitrogen from 85% up to 95%. At the same time, numerical simulations have been performed by means of a commercial software and a kinetic mechanism available in literature to value its reliability in predicting experimental results under MILD oxidation conditions. Results clearly show the occurrence of some discrepancies between numerical and experimental auto-ignition delay time data for fuel rich mixtures at high inlet temperatures. In addition, a richness of combustion regimes (slow combustion, pyrolysis, dynamic behavior, transitional combustion, combustion) was experimentally found. These unique behaviors as well as the dependence of ignition process on environmental parameters outline that modest temperature gradients due to high mixture dilution levels typical of MILD oxidation conditions, coupled with heat exchange to the surroundings, slow down the changeover among kinetic routes (namely oxidation and recombination channels) promoted by temperature thus stressing their competition. Such an aspect is generally hidden in traditional systems by a strong heat release that implies high temperature gradients. Finally, the data reported in this paper have an intrinsic value for the identification of stable operative conditions and for either tuning or reducing detailed kinetic schemes because few data are present in literature on methane ignition and oxidation in a simple reactor at atmospheric pressure. (literal)

Editore