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Biomass combustion with in situ CO2 capture by CaO. II. experimental results / Mónica Alonson in Industrial & engineering chemistry research, Vol. 50 N° 11 (Juin 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 11 (Juin 2011) . - pp. 6982-6989 Titre : Biomass combustion with in situ CO2 capture by CaO. II. experimental results Type de document : texte imprimé Auteurs : Mónica Alonson, Auteur ; Nuria Rodriguez, Auteur ; Belén Gonzalez, Auteur Année de publication : 2011 Article en page(s) : pp. 6982-6989 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Carbon  dioxide  In  situ  Combustion  Biomass Résumé : Experiments to test the concept of biomass combustion with in situ CO2 capture by CaO have been conducted in a 30 kW interconnected fluidized-bed test facility. The CO2 capture efficiency in a combustor―carbonator reactor was measured over a range of operating conditions, using three biomass feeds (olive pits, saw dust, and pellets). Overall CO2 capture efficiencies higher than 80% were achieved with sufficiently high solids circulation rates of CaO and solids inventories in the combustor―carbonator. Emissions of CO and CH4 were detected during the experiments, possibly because of pulse feeding and/or an inappropriate air/fuel mixture. The application of a simple reactor model for combining biomass combustion and CO2 capture allows an effectiveness factor of 0.74 to be derived for all of the experiments. This could be valuable for scaling-up purposes. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24199917 [article] Biomass combustion with in situ CO2 capture by CaO. II. experimental results [texte imprimé] / Mónica Alonson, Auteur ; Nuria Rodriguez, Auteur ; Belén Gonzalez, Auteur . - 2011 . - pp. 6982-6989. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 11 (Juin 2011) . - pp. 6982-6989 Mots-clés : Carbon  dioxide  In  situ  Combustion  Biomass Résumé : Experiments to test the concept of biomass combustion with in situ CO2 capture by CaO have been conducted in a 30 kW interconnected fluidized-bed test facility. The CO2 capture efficiency in a combustor―carbonator reactor was measured over a range of operating conditions, using three biomass feeds (olive pits, saw dust, and pellets). Overall CO2 capture efficiencies higher than 80% were achieved with sufficiently high solids circulation rates of CaO and solids inventories in the combustor―carbonator. Emissions of CO and CH4 were detected during the experiments, possibly because of pulse feeding and/or an inappropriate air/fuel mixture. The application of a simple reactor model for combining biomass combustion and CO2 capture allows an effectiveness factor of 0.74 to be derived for all of the experiments. This could be valuable for scaling-up purposes. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24199917

Biomass combustion with in situ CO2 capture with CaO. I. process description and economics / Juan Carlos Abanades in Industrial & engineering chemistry research, Vol. 50 N° 11 (Juin 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 11 (Juin 2011) . - pp. 6972-6981 Titre : Biomass combustion with in situ CO2 capture with CaO. I. process description and economics Type de document : texte imprimé Auteurs : Juan Carlos Abanades, Auteur ; Monica Alonso, Auteur ; Nuria Rodriguez, Auteur Année de publication : 2011 Article en page(s) : pp. 6972-6981 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Carbon  dioxide  In  situ  Combustion  Biomass Résumé : A novel concept is proposed to capture CO2 from biomass, burned in a circulating fluidized bed at a sufficiently low temperature (below 700 °C) to allow capture "in situ" by CaO. This step is followed by the calcination of CaCO3 in an interconnected oxy-fuel combustor that delivers a concentrated stream of CO2 suitable for permanent geological storage. A conceptual design and cost estimation exercise is presented and compared with other similar power plant schemes based on biomass and fossil fuels. A sensitivity analysis of the main cost variables reveals that the concept proposed is competitive against other low-carbon systems for lower values of Green Certificates and higher values of a carbon tax. The process could have long-term applications for large-scale biomass-fired systems and medium-term applications in helping large-scale power plants with CO2 capture and storage to meet the target of zero emissions by taking advantage of the negative emissions achieved from CO2 captured from biomass. A second part of this work (see the next article in this issue) demonstrates the concept in a 30 kW circulating fluidizedbed test facility. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24199916 [article] Biomass combustion with in situ CO2 capture with CaO. I. process description and economics [texte imprimé] / Juan Carlos Abanades, Auteur ; Monica Alonso, Auteur ; Nuria Rodriguez, Auteur . - 2011 . - pp. 6972-6981. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 11 (Juin 2011) . - pp. 6972-6981 Mots-clés : Carbon  dioxide  In  situ  Combustion  Biomass Résumé : A novel concept is proposed to capture CO2 from biomass, burned in a circulating fluidized bed at a sufficiently low temperature (below 700 °C) to allow capture "in situ" by CaO. This step is followed by the calcination of CaCO3 in an interconnected oxy-fuel combustor that delivers a concentrated stream of CO2 suitable for permanent geological storage. A conceptual design and cost estimation exercise is presented and compared with other similar power plant schemes based on biomass and fossil fuels. A sensitivity analysis of the main cost variables reveals that the concept proposed is competitive against other low-carbon systems for lower values of Green Certificates and higher values of a carbon tax. The process could have long-term applications for large-scale biomass-fired systems and medium-term applications in helping large-scale power plants with CO2 capture and storage to meet the target of zero emissions by taking advantage of the negative emissions achieved from CO2 captured from biomass. A second part of this work (see the next article in this issue) demonstrates the concept in a 30 kW circulating fluidizedbed test facility. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24199916

Experimental validation of the calcium looping CO2 capture process with two circulating fluidized bed carbonator reactors / Alexander Charitos in Industrial & engineering chemistry research, Vol. 50 N° 16 (Août 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 16 (Août 2011) . - pp. 9685-9695 Titre : Experimental validation of the calcium looping CO2 capture process with two circulating fluidized bed carbonator reactors Type de document : texte imprimé Auteurs : Alexander Charitos, Auteur ; Nuria Rodriguez, Auteur ; Craig Hawthorne, Auteur Année de publication : 2011 Article en page(s) : pp. 9685-9695 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Reactor  Circulating  fluidized  bed  Fluidization  Carbon  dioxide Résumé : Postcombustion CO2 capture using CaO as a regenerable solid sorbent in a circulating fluidized bed (CFB) carbonator is emerging as a promising CO2 capture technology. Experimental validation of this concept is provided through a comparative analysis of the results obtained in two laboratory-scale dual fluidized bed (DFB) installations located at INCAR-CSIC (Spain) and IFK (Germany). The analysis is focused on the performance of the CFB carbonator reactors operated with continuous solid circulation of CaO. A reasonable closure of the carbon balances (i) between the CO2 that has disappeared from the gas phase, (ii) the CaCO3 circulating between the reactors, and (iii) the CaCO3 that is formed within the carbonator bed has been established. A necessary condition for the capture of a given molar flow of CO2 is experimentally demonstrated and requires that a slightly overstoichiometric molar flow of active CaO is supplied to the carbonator. The deactivation behavior of the sorbents during continuous looping conditions has been measured. The key parameter to interpret the carbonator reactor results has been the active space time, that is indicative of the CaO inventory per molar flow of CO2 participating in the carbonation reaction and of the reaction rate of the solid inventory in the reactor. Two different approaches have been utilized in order to find a suitable expression for this parameter, thus achieving its correlation with the CO2 capture efficiency. A simple model assuming instant mixing of solids and plug-flow of the gas has been tested. Based mainly on carbonator active space time variation, the CO2 capture efficiency are shown to lie between 30% and above 90%. These results confirm the technical viability of the calcium looping postcombustion CO2 capture process. They have been used for designing the current pilot-plant facilities which are scaled up 20―50 times in regard to the lab-scale units. Moreover, the lab-scale results obtained allow for simulation work to be initiated in regard to the full scale Ca looping application. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24425212 [article] Experimental validation of the calcium looping CO2 capture process with two circulating fluidized bed carbonator reactors [texte imprimé] / Alexander Charitos, Auteur ; Nuria Rodriguez, Auteur ; Craig Hawthorne, Auteur . - 2011 . - pp. 9685-9695. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 16 (Août 2011) . - pp. 9685-9695 Mots-clés : Reactor  Circulating  fluidized  bed  Fluidization  Carbon  dioxide Résumé : Postcombustion CO2 capture using CaO as a regenerable solid sorbent in a circulating fluidized bed (CFB) carbonator is emerging as a promising CO2 capture technology. Experimental validation of this concept is provided through a comparative analysis of the results obtained in two laboratory-scale dual fluidized bed (DFB) installations located at INCAR-CSIC (Spain) and IFK (Germany). The analysis is focused on the performance of the CFB carbonator reactors operated with continuous solid circulation of CaO. A reasonable closure of the carbon balances (i) between the CO2 that has disappeared from the gas phase, (ii) the CaCO3 circulating between the reactors, and (iii) the CaCO3 that is formed within the carbonator bed has been established. A necessary condition for the capture of a given molar flow of CO2 is experimentally demonstrated and requires that a slightly overstoichiometric molar flow of active CaO is supplied to the carbonator. The deactivation behavior of the sorbents during continuous looping conditions has been measured. The key parameter to interpret the carbonator reactor results has been the active space time, that is indicative of the CaO inventory per molar flow of CO2 participating in the carbonation reaction and of the reaction rate of the solid inventory in the reactor. Two different approaches have been utilized in order to find a suitable expression for this parameter, thus achieving its correlation with the CO2 capture efficiency. A simple model assuming instant mixing of solids and plug-flow of the gas has been tested. Based mainly on carbonator active space time variation, the CO2 capture efficiency are shown to lie between 30% and above 90%. These results confirm the technical viability of the calcium looping postcombustion CO2 capture process. They have been used for designing the current pilot-plant facilities which are scaled up 20―50 times in regard to the lab-scale units. Moreover, the lab-scale results obtained allow for simulation work to be initiated in regard to the full scale Ca looping application. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24425212