Influence of operating conditions on SO3 formation during air and oxy - fuel combustion / Daniel Fleig in Industrial & engineering chemistry research, Vol. 51 N° 28 (Juillet 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 28 (Juillet 2012) . - pp. 9475-9482 Titre : Influence of operating conditions on SO3 formation during air and oxy - fuel combustion Type de document : texte imprimé Auteurs : Daniel Fleig, Auteur ; Klas Andersson, Auteur ; Filip Johnsson, Auteur Année de publication : 2012 Article en page(s) : pp. 9475-9482 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Oxidant Supercritical state Pollution abatement Résumé : Abatement of aniline in supercritical water was explored in a tubular-flow reactor using oxygen as the oxidant. The effects of the reaction temperature, oxidant stoichiometric ratio, residence time, and initial aniline concentration on the product distribution were investigated. Aniline was primarily hydrolyzed to phenol and ammonia, and thereby, abatement of aniline was converted into the co-oxidation of phenol and ammonia in supercritical water. Phenol was the main carbon-containing intermediate, and ammonia was the exclusive nitrogen-containing intermediate on the pathway to the end products N2, N2O, and NO3-. Owing to the adsorption of aniline and catalysis on the reactor wall (made of Hastelloy C-276), the disappearance of ammonia during aniline supercritical water oxidation (SCWO) was markedly faster than that during SCWO of ammonia alone. Ammonia was mainly converted to N2 (heterogeneous mechanism), and low levels of N2O and NO3― were also produced (homogeneous mechanism). ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26163283 [article] Influence of operating conditions on SO3 formation during air and oxy - fuel combustion [texte imprimé] / Daniel Fleig, Auteur ; Klas Andersson, Auteur ; Filip Johnsson, Auteur . - 2012 . - pp. 9475-9482. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 28 (Juillet 2012) . - pp. 9475-9482 Mots-clés : Oxidant Supercritical state Pollution abatement Résumé : Abatement of aniline in supercritical water was explored in a tubular-flow reactor using oxygen as the oxidant. The effects of the reaction temperature, oxidant stoichiometric ratio, residence time, and initial aniline concentration on the product distribution were investigated. Aniline was primarily hydrolyzed to phenol and ammonia, and thereby, abatement of aniline was converted into the co-oxidation of phenol and ammonia in supercritical water. Phenol was the main carbon-containing intermediate, and ammonia was the exclusive nitrogen-containing intermediate on the pathway to the end products N2, N2O, and NO3-. Owing to the adsorption of aniline and catalysis on the reactor wall (made of Hastelloy C-276), the disappearance of ammonia during aniline supercritical water oxidation (SCWO) was markedly faster than that during SCWO of ammonia alone. Ammonia was mainly converted to N2 (heterogeneous mechanism), and low levels of N2O and NO3― were also produced (homogeneous mechanism). ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26163283

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SO3 formation under oxyfuel combustion conditions / Daniel Fleig in Industrial & engineering chemistry research, Vol. 50 N° 14 (Juillet 2011)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 50 N° 14 (Juillet 2011) . - pp. 8505–8514 Titre : SO3 formation under oxyfuel combustion conditions Type de document : texte imprimé Auteurs : Daniel Fleig, Auteur ; Klas Andersson, Auteur ; Fredrik Normann, Auteur Année de publication : 2011 Article en page(s) : pp. 8505–8514 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Oxyfuel combustion Résumé : The sulfur chemistry in oxyfuel combustion systems has received growing attention lately. The formation of SO3 is of special concern, because of the elevated SO2 concentrations found in oxyfuel, compared to air-fuel conditions. The present study focuses on the gas-phase chemistry and examines the impact of different combustion parameters and atmospheres on the formation of SO3 in oxyfuel and air-fuel flames, using a detailed gas-phase model. The work also includes a summary of the presently available SOx data from experiments in laboratory and pilot-scale combustors. The reviewed experimental data, as well as the modeling results, show significantly increased SO3 concentrations in oxyfuel, compared to air-fuel conditions. The modeling results reveal a complex behavior of the SO3 formation, which is influenced by direct and indirect effects of the SO2, O2, NOx, and CO content in the flue gas. One of the main contributors to the increased SO3 concentration in oxyfuel, compared to air-fuel conditions, is the high concentration of SO2 in oxyfuel combustion. The modeling also shows that the stoichiometry, residence time, and flue-gas cooling rate are critical to the SO3 formation. Thus, in addition to the stoichiometry of the flame, the flue-gas recycling conditions are likely to influence the formation of SO3 in oxyfuel combustion. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2005274 [article] SO3 formation under oxyfuel combustion conditions [texte imprimé] / Daniel Fleig, Auteur ; Klas Andersson, Auteur ; Fredrik Normann, Auteur . - 2011 . - pp. 8505–8514. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 14 (Juillet 2011) . - pp. 8505–8514 Mots-clés : Oxyfuel combustion Résumé : The sulfur chemistry in oxyfuel combustion systems has received growing attention lately. The formation of SO3 is of special concern, because of the elevated SO2 concentrations found in oxyfuel, compared to air-fuel conditions. The present study focuses on the gas-phase chemistry and examines the impact of different combustion parameters and atmospheres on the formation of SO3 in oxyfuel and air-fuel flames, using a detailed gas-phase model. The work also includes a summary of the presently available SOx data from experiments in laboratory and pilot-scale combustors. The reviewed experimental data, as well as the modeling results, show significantly increased SO3 concentrations in oxyfuel, compared to air-fuel conditions. The modeling results reveal a complex behavior of the SO3 formation, which is influenced by direct and indirect effects of the SO2, O2, NOx, and CO content in the flue gas. One of the main contributors to the increased SO3 concentration in oxyfuel, compared to air-fuel conditions, is the high concentration of SO2 in oxyfuel combustion. The modeling also shows that the stoichiometry, residence time, and flue-gas cooling rate are critical to the SO3 formation. Thus, in addition to the stoichiometry of the flame, the flue-gas recycling conditions are likely to influence the formation of SO3 in oxyfuel combustion. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2005274

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