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Low-cost Fe-based oxygen carrier materials for the iG-CLC process with coal. 1 / T. Mendiara in Industrial & engineering chemistry research, Vol. 51 N° 50 (Décembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 50 (Décembre 2012) . - pp. 16216-16229 Titre : Low-cost Fe-based oxygen carrier materials for the iG-CLC process with coal. 1 Type de document : texte imprimé Auteurs : T. Mendiara, Auteur ; R. Perez, Auteur ; A. Abad, Auteur Année de publication : 2013 Article en page(s) : pp. 16216-16229 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Coal Résumé : Different low-cost materials, especially Fe-based minerals or industrial residues, have been tested as carriers for iG-CLC. This work presents a methodology for the comparison of potential oxygen carriers. The methodology is based on results obtained in a batch fluidized bed reactor. The experiments were designed so that estimated solids inventory in the fuel reactor could be calculated for each oxygen carrier at different conditions and later compared. In the present paper, which is the first of a series of two, experimental results for different Fe-based materials were obtained. The second paper focuses on the evaluation and the comparison of the carriers based on these experimental results. In the present work, the performance of two iron minerals (hematite based and copper ferrite) is analyzed and compared to the behavior of ilmenite and a bauxite waste. The performance of a highly reactive synthetic Fe-based material is evaluated for comparison. In the TGA, the reactivity of the different materials to H2, CO, CH4, and O2 was studied. In the experiments in a fluidized bed, several O/C molar ratios were used to evaluate its effect on char gasification rate and combustion efficiency of the gasification products. The char gasification rate decreased when the O/C molar ratio decreased as the concentration of H2 and CO in the bed increased and high levels of these gases inhibit char gasification. With no inhibitory effect, the char gasification rate was very similar. Both the bauxite waste and the hematite based mineral were able to bum the gasification products with high combustion efficiencies, comparable to those obtained in the same conditions using the synthetic Fe-based material. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26732148 [article] Low-cost Fe-based oxygen carrier materials for the iG-CLC process with coal. 1 [texte imprimé] / T. Mendiara, Auteur ; R. Perez, Auteur ; A. Abad, Auteur . - 2013 . - pp. 16216-16229. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 50 (Décembre 2012) . - pp. 16216-16229 Mots-clés : Coal Résumé : Different low-cost materials, especially Fe-based minerals or industrial residues, have been tested as carriers for iG-CLC. This work presents a methodology for the comparison of potential oxygen carriers. The methodology is based on results obtained in a batch fluidized bed reactor. The experiments were designed so that estimated solids inventory in the fuel reactor could be calculated for each oxygen carrier at different conditions and later compared. In the present paper, which is the first of a series of two, experimental results for different Fe-based materials were obtained. The second paper focuses on the evaluation and the comparison of the carriers based on these experimental results. In the present work, the performance of two iron minerals (hematite based and copper ferrite) is analyzed and compared to the behavior of ilmenite and a bauxite waste. The performance of a highly reactive synthetic Fe-based material is evaluated for comparison. In the TGA, the reactivity of the different materials to H2, CO, CH4, and O2 was studied. In the experiments in a fluidized bed, several O/C molar ratios were used to evaluate its effect on char gasification rate and combustion efficiency of the gasification products. The char gasification rate decreased when the O/C molar ratio decreased as the concentration of H2 and CO in the bed increased and high levels of these gases inhibit char gasification. With no inhibitory effect, the char gasification rate was very similar. Both the bauxite waste and the hematite based mineral were able to bum the gasification products with high combustion efficiencies, comparable to those obtained in the same conditions using the synthetic Fe-based material. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26732148

Low-Cost Fe-Based Oxygen Carrier Materials for the iG-CLC Process with Coal. 2 / A. Abad in Industrial & engineering chemistry research, Vol. 51 N° 50 (Décembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 50 (Décembre 2012) . - pp. 16230-16241 Titre : Low-Cost Fe-Based Oxygen Carrier Materials for the iG-CLC Process with Coal. 2 Type de document : texte imprimé Auteurs : A. Abad, Auteur ; A. Cuadrat, Auteur ; T. Mendiara, Auteur Année de publication : 2013 Article en page(s) : pp. 16230-16241 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Coal Résumé : In order to compare potential oxygen carriers for the iG-CLC with coal a methodology was developed from results obtained in a batch fluidized reactor. The methodology is based on the solids inventory in the fuel reactor. The solids inventory values will be used for comparison purposes among different materials rather than for design purposes. In a companion paper, experiments with different types of Fe-based oxygen carriers were presented. Based on these experimental results, the present paper proposes two theoretical approaches for a fast evaluation of different materials as potential oxygen carriers for the iG-CLC process with different fuels. The methodology is focused on the study of the gasification of the char generated in the process after the devolatilization of the corresponding solid fuel and the subsequent combustion of the gasification products. Considering the results of carbon capture and combustion efficiency, the adequacy of the material can be evaluated. Four different Fe-based materials are tested in this work: ilmenite, bauxite waste, a mineral based on hematite, and a synthetic material. Based on the results obtained, the bauxite waste and the hematite mineral present the best performance for iG-CLC. As a rough estimation, an inventory around 1600 kg/MWtb will be needed using any of the above materials to achieve carbon captures above 0.93 and combustion efficiencies of 0.99 at 1000 °C. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26732149 [article] Low-Cost Fe-Based Oxygen Carrier Materials for the iG-CLC Process with Coal. 2 [texte imprimé] / A. Abad, Auteur ; A. Cuadrat, Auteur ; T. Mendiara, Auteur . - 2013 . - pp. 16230-16241. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 50 (Décembre 2012) . - pp. 16230-16241 Mots-clés : Coal Résumé : In order to compare potential oxygen carriers for the iG-CLC with coal a methodology was developed from results obtained in a batch fluidized reactor. The methodology is based on the solids inventory in the fuel reactor. The solids inventory values will be used for comparison purposes among different materials rather than for design purposes. In a companion paper, experiments with different types of Fe-based oxygen carriers were presented. Based on these experimental results, the present paper proposes two theoretical approaches for a fast evaluation of different materials as potential oxygen carriers for the iG-CLC process with different fuels. The methodology is focused on the study of the gasification of the char generated in the process after the devolatilization of the corresponding solid fuel and the subsequent combustion of the gasification products. Considering the results of carbon capture and combustion efficiency, the adequacy of the material can be evaluated. Four different Fe-based materials are tested in this work: ilmenite, bauxite waste, a mineral based on hematite, and a synthetic material. Based on the results obtained, the bauxite waste and the hematite mineral present the best performance for iG-CLC. As a rough estimation, an inventory around 1600 kg/MWtb will be needed using any of the above materials to achieve carbon captures above 0.93 and combustion efficiencies of 0.99 at 1000 °C. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26732149