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Impacts of emission variability and flare combustion efficiency on ozone formation in the houston–galveston–brazoria area / Radovan T. Pavlovic in Industrial & engineering chemistry research, Vol. 51 N° 39 (Octobre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 39 (Octobre 2012) . - pp. 12593-12599 Titre : Impacts of emission variability and flare combustion efficiency on ozone formation in the houston–galveston–brazoria area Type de document : texte imprimé Auteurs : Radovan T. Pavlovic, Auteur ; Fahad M. Al Fadhli, Auteur ; Yosuke Kimura, Auteur Année de publication : 2012 Article en page(s) : pp. 12593-12599 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Pollutant  formation  Combustion Résumé : Recent studies in the Houston―Galveston―Brazoria (HGB) area of Texas have suggested that industrial flares exhibit high temporal emissions variability and that flare combustion efficiencies could vary with air and steam assist rates, particularly at lower flow rates, and when low heating value gases are combusted. This work examined the difference in ozone formation potential associated with accounting for temporal variability in flaring emissions, as opposed to assuming the same amount of mass was emitted at a constant, average flow rate. The temporal variability in flare emissions was found to lead to differences in ozone concentrations of as much as 27 ppb in the HGB area. This work also examined the potential ozone formation impacts of flare combustion efficiencies of less than 98―99%, applied to 25 flares throughout the HGB region. Deterioration in combustion efficiency (CE) was found to affect ozone concentrations by a few to more than 50 ppb, depending on the level of the assumed CE. While the ozone impacts associated with temporal variability in emissions typically lasted a few hours, consistent with the length of large flaring events, lowering of the CE significantly increased emissions and ozone concentrations over periods ranging from several hours to several days for some flare types. Thus, changes in CE may affect ozone concentrations for longer durations and over larger spatial extents than episodic emissions events. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26419213 [article] Impacts of emission variability and flare combustion efficiency on ozone formation in the houston–galveston–brazoria area [texte imprimé] / Radovan T. Pavlovic, Auteur ; Fahad M. Al Fadhli, Auteur ; Yosuke Kimura, Auteur . - 2012 . - pp. 12593-12599. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 39 (Octobre 2012) . - pp. 12593-12599 Mots-clés : Pollutant  formation  Combustion Résumé : Recent studies in the Houston―Galveston―Brazoria (HGB) area of Texas have suggested that industrial flares exhibit high temporal emissions variability and that flare combustion efficiencies could vary with air and steam assist rates, particularly at lower flow rates, and when low heating value gases are combusted. This work examined the difference in ozone formation potential associated with accounting for temporal variability in flaring emissions, as opposed to assuming the same amount of mass was emitted at a constant, average flow rate. The temporal variability in flare emissions was found to lead to differences in ozone concentrations of as much as 27 ppb in the HGB area. This work also examined the potential ozone formation impacts of flare combustion efficiencies of less than 98―99%, applied to 25 flares throughout the HGB region. Deterioration in combustion efficiency (CE) was found to affect ozone concentrations by a few to more than 50 ppb, depending on the level of the assumed CE. While the ozone impacts associated with temporal variability in emissions typically lasted a few hours, consistent with the length of large flaring events, lowering of the CE significantly increased emissions and ozone concentrations over periods ranging from several hours to several days for some flare types. Thus, changes in CE may affect ozone concentrations for longer durations and over larger spatial extents than episodic emissions events. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26419213

Temporal variability in flaring emissions in the houston–galveston area / Radovan T. Pavlovic in Industrial & engineering chemistry research, Vol. 51 N° 39 (Octobre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 39 (Octobre 2012) . - pp. 12653–12662 Titre : Temporal variability in flaring emissions in the houston–galveston area Type de document : texte imprimé Auteurs : Radovan T. Pavlovic, Auteur ; David T. Allen, Auteur ; Elena C. McDonald-Buller, Auteur Année de publication : 2012 Article en page(s) : pp. 12653–12662 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Industrial  air  pollutant  emission Résumé : Recent studies performed in the Houston–Galveston–Brazoria (HGB) area indicate that some industrial air pollutant emission sources exhibit high temporal variability that can lead to very rapid ozone formation, especially when emissions include highly reactive volatile organic compounds. This motivated the collection of a unique data set of air pollutant emissions, from industrial facilities, reported with an hourly time resolution. The industrial flares portion of this data set was utilized in this work to characterize and model the highly variable temporal patterns of flare emissions at petrochemical facilities. Petrochemical and chemical manufacturing flares were grouped into categories based on industrial process they service, chemical composition of the flared gas, and the temporal patterns of their emissions. Stochastic models were developed for each categorization of flare emissions and provide representative temporal profiles for flares in specific types of operations in the petrochemical and chemical manufacturing sectors. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2013357 [article] Temporal variability in flaring emissions in the houston–galveston area [texte imprimé] / Radovan T. Pavlovic, Auteur ; David T. Allen, Auteur ; Elena C. McDonald-Buller, Auteur . - 2012 . - pp. 12653–12662. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 39 (Octobre 2012) . - pp. 12653–12662 Mots-clés : Industrial  air  pollutant  emission Résumé : Recent studies performed in the Houston–Galveston–Brazoria (HGB) area indicate that some industrial air pollutant emission sources exhibit high temporal variability that can lead to very rapid ozone formation, especially when emissions include highly reactive volatile organic compounds. This motivated the collection of a unique data set of air pollutant emissions, from industrial facilities, reported with an hourly time resolution. The industrial flares portion of this data set was utilized in this work to characterize and model the highly variable temporal patterns of flare emissions at petrochemical facilities. Petrochemical and chemical manufacturing flares were grouped into categories based on industrial process they service, chemical composition of the flared gas, and the temporal patterns of their emissions. Stochastic models were developed for each categorization of flare emissions and provide representative temporal profiles for flares in specific types of operations in the petrochemical and chemical manufacturing sectors. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2013357