Documents disponibles écrits par cet auteur

Effect of partial carbonation on the cyclic CaO carbonation reaction / Gemma Grasa in Industrial & engineering chemistry research, Vol. 48 N° 20 (Octobre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 20 (Octobre 2009) . - pp. Titre : Effect of partial carbonation on the cyclic CaO carbonation reaction Type de document : texte imprimé Auteurs : Gemma Grasa, Auteur ; Juan Carlos Abanades, Auteur ; Edward J. Anthony, Auteur Année de publication : 2010 Article en page(s) : pp. Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : CaO  particles  Carbonation Résumé : CaO particles from the calcination of natural limestones can be used as regenerable solid sorbents in some CO2 capture systems. Their decay curves in terms of CO2 capture capacity have been extensively studied in the literature, always in experiments allowing particles to reach their maximum carbonation conversion for a given cycle. However, at the expected operating conditions in a CO2 capture system using the carbonation reaction, a relevant fraction of the CaO particles will not have time to fully convert in the carbonator reactor. This work investigates if there is any effect on the decay curves when CaO is only partially converted in each cycle. Experiments have been conducted in a thermobalance arranged to interrupt the carbonation reaction in each cycle before the end of the fast reaction period typical in the CaO−CO2 reaction. It is shown that, after the necessary normalization of results, the effective capacity of the sorbent to absorb CO2 during particle lifetime in the capture system slightly increases and CaO particles partially converted behave “younger” than particles fully converted after every calcination. This has beneficial implications for the design of carbonation/calcination loops. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900443y [article] Effect of partial carbonation on the cyclic CaO carbonation reaction [texte imprimé] / Gemma Grasa, Auteur ; Juan Carlos Abanades, Auteur ; Edward J. Anthony, Auteur . - 2010 . - pp. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 20 (Octobre 2009) . - pp. Mots-clés : CaO  particles  Carbonation Résumé : CaO particles from the calcination of natural limestones can be used as regenerable solid sorbents in some CO2 capture systems. Their decay curves in terms of CO2 capture capacity have been extensively studied in the literature, always in experiments allowing particles to reach their maximum carbonation conversion for a given cycle. However, at the expected operating conditions in a CO2 capture system using the carbonation reaction, a relevant fraction of the CaO particles will not have time to fully convert in the carbonator reactor. This work investigates if there is any effect on the decay curves when CaO is only partially converted in each cycle. Experiments have been conducted in a thermobalance arranged to interrupt the carbonation reaction in each cycle before the end of the fast reaction period typical in the CaO−CO2 reaction. It is shown that, after the necessary normalization of results, the effective capacity of the sorbent to absorb CO2 during particle lifetime in the capture system slightly increases and CaO particles partially converted behave “younger” than particles fully converted after every calcination. This has beneficial implications for the design of carbonation/calcination loops. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900443y

Modeling of the deactivation of CaO in a carbonate loop at high temperatures of calcination / Belén Gonzalez in Industrial & engineering chemistry research, Vol. 47 N° 23 (Décembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9256–9262 Titre : Modeling of the deactivation of CaO in a carbonate loop at high temperatures of calcination Type de document : texte imprimé Auteurs : Belén Gonzalez, Auteur ; Gemma Grasa, Auteur ; Monica Alonso, Auteur Année de publication : 2009 Article en page(s) : p. 9256–9262 Note générale : Chemistry engineering Langues : Anglais (eng) Mots-clés : CaO  Carbonate  Loop  High  Temperatures  of  Calcination Résumé : Calcium oxide is being proposed as a regenerable sorbent for CO2 at high temperatures via a carbonation/calcination loop. It is well-known that natural sorbents lose their capacity to capture CO2 as the number of the carbonation/calcination cycles increases. The equations proposed in the literature to describe this decay are limited to moderate calcination temperatures (typically well below 950 °C). This work studies the effect of the calcination temperature and calcination time when the temperatures exceed 950 °C. Such high regeneration temperatures are necessary in some of the most efficient processes proposed, and they are shown to strongly affect sorbent performance. We propose a model to describe maximum sorbent conversion as a function of the number of cycles, the calcination temperature, and the calcination time. This model combines existing knowledge about the decay of sorbent activity under moderate calcination temperatures with the effect of sintering in each cycle. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8009318 [article] Modeling of the deactivation of CaO in a carbonate loop at high temperatures of calcination [texte imprimé] / Belén Gonzalez, Auteur ; Gemma Grasa, Auteur ; Monica Alonso, Auteur . - 2009 . - p. 9256–9262. Chemistry engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9256–9262 Mots-clés : CaO  Carbonate  Loop  High  Temperatures  of  Calcination Résumé : Calcium oxide is being proposed as a regenerable sorbent for CO2 at high temperatures via a carbonation/calcination loop. It is well-known that natural sorbents lose their capacity to capture CO2 as the number of the carbonation/calcination cycles increases. The equations proposed in the literature to describe this decay are limited to moderate calcination temperatures (typically well below 950 °C). This work studies the effect of the calcination temperature and calcination time when the temperatures exceed 950 °C. Such high regeneration temperatures are necessary in some of the most efficient processes proposed, and they are shown to strongly affect sorbent performance. We propose a model to describe maximum sorbent conversion as a function of the number of cycles, the calcination temperature, and the calcination time. This model combines existing knowledge about the decay of sorbent activity under moderate calcination temperatures with the effect of sintering in each cycle. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8009318