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Experiments and kinetic modeling for CO2 gasification of indian coal chars in the context of underground coal gasification / Ramesh Naidu Mandapati in Industrial & engineering chemistry research, Vol. 51 N° 46 (Novembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 46 (Novembre 2012) . - pp. 15041-15052 Titre : Experiments and kinetic modeling for CO2 gasification of indian coal chars in the context of underground coal gasification Type de document : texte imprimé Auteurs : Ramesh Naidu Mandapati, Auteur ; Sateesh Daggupati, Auteur ; Sanjay M. Mahajani, Auteur Année de publication : 2013 Article en page(s) : pp. 15041-15052 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Modeling  Coal  Coal  gasification  Carbon  dioxide  Kinetic  model Résumé : Gasification of four Indian coals is carried out in a CO2 atmosphere, using a thermogravimetric analyzer (TGA) to determine the intrinsic kinetics over a temperature range of 800―1050 °C with different partial pressures of CO2. The applicability of three models, viz., the volumetric reaction model, the shrinking core model and the random pore model, is evaluated. Of these three models, the random pore model is found to be the most suitable for all the coals considered in the current study. The dependence of the reaction rate on the gas-phase partial pressures is explained by the Langmuir― Hinshelwood model, and the parameters for the inhibition due to CO and CO2 are determined by performing experiments at different partial pressures. In underground coal gasification, the reaction takes place on reasonably large sized coal particles, wherein diffusion effects are significant. A one-dimensional reaction diffusion model is therefore developed in order to determine the diffusional resistance in the coal particle, and values of diffusivity are estimated. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679623 [article] Experiments and kinetic modeling for CO2 gasification of indian coal chars in the context of underground coal gasification [texte imprimé] / Ramesh Naidu Mandapati, Auteur ; Sateesh Daggupati, Auteur ; Sanjay M. Mahajani, Auteur . - 2013 . - pp. 15041-15052. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 46 (Novembre 2012) . - pp. 15041-15052 Mots-clés : Modeling  Coal  Coal  gasification  Carbon  dioxide  Kinetic  model Résumé : Gasification of four Indian coals is carried out in a CO2 atmosphere, using a thermogravimetric analyzer (TGA) to determine the intrinsic kinetics over a temperature range of 800―1050 °C with different partial pressures of CO2. The applicability of three models, viz., the volumetric reaction model, the shrinking core model and the random pore model, is evaluated. Of these three models, the random pore model is found to be the most suitable for all the coals considered in the current study. The dependence of the reaction rate on the gas-phase partial pressures is explained by the Langmuir― Hinshelwood model, and the parameters for the inhibition due to CO and CO2 are determined by performing experiments at different partial pressures. In underground coal gasification, the reaction takes place on reasonably large sized coal particles, wherein diffusion effects are significant. A one-dimensional reaction diffusion model is therefore developed in order to determine the diffusional resistance in the coal particle, and values of diffusivity are estimated. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679623