Documents disponibles écrits par cet auteur

Comparison of mercury retention by fly ashes using different experimental devices / M. Antonia López-Antón in Industrial & engineering chemistry research, Vol. 48 N° 23 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 23 (Décembre 2009) . - pp. 10702–10707 Titre : Comparison of mercury retention by fly ashes using different experimental devices Type de document : texte imprimé Auteurs : M. Antonia López-Antón, Auteur ; Patricia Abad-Valle, Auteur ; Mercedes Díaz-Somoano, Auteur Année de publication : 2010 Article en page(s) : pp. 10702–10707 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Comparison--Mercury  Retention--Fly  Ashes--Using--Different--Experimental--Devices Résumé : To study mercury (Hg) retention in solid sorbents, researchers generally employ similar laboratory-scale devices. However, despite their similarities, these devices are generally used under different experimental conditions. The Hg concentration in the gas phase, gas flow, and sorbent-bed characteristics are variables that influence the contact time, mass transfer, and kinetics and may greatly modify the quantities of Hg retained when the same sorbents are compared. These differences in the experimental conditions do not impede an evaluation of the sorbents as long as the results obtained points toward the same qualitative conclusions. However, the extent of variation needs to be defined to avoid misinterpretation. To illustrate the range of interpretations, the results of a preliminary approach using four experimental devices in two laboratories have been compared in this work. All the experiments were carried out under a nitrogen atmosphere and Hg0 in the gas phase. The same sorbents were employed in all the devices. These were fly ashes obtained from the combustion of coals of different rank and with different unburned carbon contents. From the results obtained it can be inferred that it is necessary to strictly control the influence of the experimental variables to infer a correct interpretation of the results. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900766y [article] Comparison of mercury retention by fly ashes using different experimental devices [texte imprimé] / M. Antonia López-Antón, Auteur ; Patricia Abad-Valle, Auteur ; Mercedes Díaz-Somoano, Auteur . - 2010 . - pp. 10702–10707. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 23 (Décembre 2009) . - pp. 10702–10707 Mots-clés : Comparison--Mercury  Retention--Fly  Ashes--Using--Different--Experimental--Devices Résumé : To study mercury (Hg) retention in solid sorbents, researchers generally employ similar laboratory-scale devices. However, despite their similarities, these devices are generally used under different experimental conditions. The Hg concentration in the gas phase, gas flow, and sorbent-bed characteristics are variables that influence the contact time, mass transfer, and kinetics and may greatly modify the quantities of Hg retained when the same sorbents are compared. These differences in the experimental conditions do not impede an evaluation of the sorbents as long as the results obtained points toward the same qualitative conclusions. However, the extent of variation needs to be defined to avoid misinterpretation. To illustrate the range of interpretations, the results of a preliminary approach using four experimental devices in two laboratories have been compared in this work. All the experiments were carried out under a nitrogen atmosphere and Hg0 in the gas phase. The same sorbents were employed in all the devices. These were fly ashes obtained from the combustion of coals of different rank and with different unburned carbon contents. From the results obtained it can be inferred that it is necessary to strictly control the influence of the experimental variables to infer a correct interpretation of the results. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900766y

Distribution of Trace Elements from a Coal Burned in Two Different Spanish Power Stations / M. Antonia López-Antón in Industrial & engineering chemistry research, Vol. 50 N° 21 (Novembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 21 (Novembre 2011) . - pp. 12208-12216 Titre : Distribution of Trace Elements from a Coal Burned in Two Different Spanish Power Stations Type de document : texte imprimé Auteurs : M. Antonia López-Antón, Auteur ; Mercedes Díaz-Somoano, Auteur ; Raquel Ochoa-González, Auteur Année de publication : 2011 Article en page(s) : pp. 12208-12216 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Coal  Trace  element Résumé : The behavior of trace elements during coal combustion varies, depending on their mode of occurrence in a given coal and the variations in the operational conditions in the power plants. However, the extent to which these variables may influence the behavior of trace elements is not yet clear. The objective of this study is to evaluate the influence of the operational conditions on the behavior of trace elements in two coal-fired power plants when the same coal supply is used. Fractions of the fly ash sampled from the hoppers of the electrostatic precipitators (ESPs) were studied and the relative enrichment (RE) factors of the elements were compared. Moreover, a series of leaching tests were carried out, with the objective of determining the level of risk when the wastes are finally disposed of. The behavior of the trace elements was found to be broadly similar. However, some differences were observed when evaluating their distribution among the different fly ash fractions from the ESPs. These differences are related to (i) the operational variables of the power plants and (ii) the performance of the mills. All of the coal combustion byproducts evaluated in this work may be considered as inert waste when they are disposed of. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24697539 [article] Distribution of Trace Elements from a Coal Burned in Two Different Spanish Power Stations [texte imprimé] / M. Antonia López-Antón, Auteur ; Mercedes Díaz-Somoano, Auteur ; Raquel Ochoa-González, Auteur . - 2011 . - pp. 12208-12216. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 21 (Novembre 2011) . - pp. 12208-12216 Mots-clés : Coal  Trace  element Résumé : The behavior of trace elements during coal combustion varies, depending on their mode of occurrence in a given coal and the variations in the operational conditions in the power plants. However, the extent to which these variables may influence the behavior of trace elements is not yet clear. The objective of this study is to evaluate the influence of the operational conditions on the behavior of trace elements in two coal-fired power plants when the same coal supply is used. Fractions of the fly ash sampled from the hoppers of the electrostatic precipitators (ESPs) were studied and the relative enrichment (RE) factors of the elements were compared. Moreover, a series of leaching tests were carried out, with the objective of determining the level of risk when the wastes are finally disposed of. The behavior of the trace elements was found to be broadly similar. However, some differences were observed when evaluating their distribution among the different fly ash fractions from the ESPs. These differences are related to (i) the operational variables of the power plants and (ii) the performance of the mills. All of the coal combustion byproducts evaluated in this work may be considered as inert waste when they are disposed of. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24697539