Documents disponibles écrits par cet auteur

Novel regenerable magnesium hydroxide sorbents for CO2 capture at warm gas temperatures / Ranjani V. Siriwardane in Industrial & engineering chemistry research, Vol. 48 N°4 (Février 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - p. 2135–2141 Titre : Novel regenerable magnesium hydroxide sorbents for CO2 capture at warm gas temperatures Type de document : texte imprimé Auteurs : Ranjani V. Siriwardane, Auteur ; Robert W. Stevens,Jr., Auteur Année de publication : 2009 Article en page(s) : p. 2135–2141 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Magnesium  hydroxide  sorbents  Carbon  dioxide  Thermodynamic  analysis Résumé : A novel sorbent consisting of Mg(OH)2 was developed for carbon dioxide (CO2) capture at 200−315 °C suitable for CO2 capture applications such as coal gasification systems. Thermodynamic analysis conducted with the FactSage software package indicated that the Mg(OH)2 sorbent system is highly favorable for CO2 capture up to 400 °C at 30 atm. MgCO3 formed during sorption decomposes to release CO2 at temperatures as low as 375 °C up to 20 atm. MgO rehydroxylation to form Mg(OH)2 is possible at temperatures up to 300 °C at 20 atm. The experimental data show that the sorbent is regenerable at 375 °C at high pressure and that steam does not affect the sorbent performance. A multicycle test conducted in a high-pressure fixed-bed flow reactor at 200 °C with 28% CO2 showed stable reactivity during the cyclic tests. The capture capacity also increased with increasing pressure. The sorbent is unique because it exhibits a high CO2 capture capacity of more than 3 mol/kg at 200 °C and also is regenerable at a low temperature of 375 °C and high pressure. High-pressure regeneration is advantageous because the CO2 compression costs required for sequestration can be reduced. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8011598 [article] Novel regenerable magnesium hydroxide sorbents for CO2 capture at warm gas temperatures [texte imprimé] / Ranjani V. Siriwardane, Auteur ; Robert W. Stevens,Jr., Auteur . - 2009 . - p. 2135–2141. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - p. 2135–2141 Mots-clés : Magnesium  hydroxide  sorbents  Carbon  dioxide  Thermodynamic  analysis Résumé : A novel sorbent consisting of Mg(OH)2 was developed for carbon dioxide (CO2) capture at 200−315 °C suitable for CO2 capture applications such as coal gasification systems. Thermodynamic analysis conducted with the FactSage software package indicated that the Mg(OH)2 sorbent system is highly favorable for CO2 capture up to 400 °C at 30 atm. MgCO3 formed during sorption decomposes to release CO2 at temperatures as low as 375 °C up to 20 atm. MgO rehydroxylation to form Mg(OH)2 is possible at temperatures up to 300 °C at 20 atm. The experimental data show that the sorbent is regenerable at 375 °C at high pressure and that steam does not affect the sorbent performance. A multicycle test conducted in a high-pressure fixed-bed flow reactor at 200 °C with 28% CO2 showed stable reactivity during the cyclic tests. The capture capacity also increased with increasing pressure. The sorbent is unique because it exhibits a high CO2 capture capacity of more than 3 mol/kg at 200 °C and also is regenerable at a low temperature of 375 °C and high pressure. High-pressure regeneration is advantageous because the CO2 compression costs required for sequestration can be reduced. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8011598

Process for CO2 capture from high - pressure and moderate - temperature gas streams / James C. Fisher in Industrial & engineering chemistry research, Vol. 51 N° 14 (Avril 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 14 (Avril 2012) . - pp. 5273-5281 Titre : Process for CO2 capture from high - pressure and moderate - temperature gas streams Type de document : texte imprimé Auteurs : James C. Fisher, Auteur ; Ranjani V. Siriwardane, Auteur ; Robert W. Stevens, Auteur Année de publication : 2012 Article en page(s) : pp. 5273-5281 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Carbon  dioxide Résumé : A novel CO2 capture process was developed using a Mg(OH)2-based sorbent suitable for warm gas CO2 removal from high-pressure coal gasification gas streams. The purpose of this study is to perform a preliminary energy study and develop a method to implement this sorbent in a power plant. The proposed CO2 removal process involves sorption of CO2 at 200―300 °C and regeneration at 385 °C. The operational temperature is ideal for CO2 capture downstream to the water―gas shift reactor in an integrated gasification combined cycle (IGCC) power plant but is applicable to other warm gas cleanup processes as well. This technology offers the ability to fully utilize the potential efficiency increases associated with warm gas clean up. Additionally, the sorbent is able to operate in the presence of steam, which distinguishes it from other technologies that require an energy-intensive drying step prior to CO2 separation. Regeneration is carried out at 280 psi and 400 °C, resulting in a high-pressure CO2 product stream, which significantly reduces the auxiliary load normally associated with CO2 compression for sequestration. The chemistry of the sorption process also reduces the amount of steam traditionally required for the water-gas shift reactor by 50%, increasing the overall efficiency of the plant. The incorporation of the sorbent and the described methods resulted in an overall IGCC power plant efficiency greater than that of the competing Selexol technology. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25783436 [article] Process for CO2 capture from high - pressure and moderate - temperature gas streams [texte imprimé] / James C. Fisher, Auteur ; Ranjani V. Siriwardane, Auteur ; Robert W. Stevens, Auteur . - 2012 . - pp. 5273-5281. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 14 (Avril 2012) . - pp. 5273-5281 Mots-clés : Carbon  dioxide Résumé : A novel CO2 capture process was developed using a Mg(OH)2-based sorbent suitable for warm gas CO2 removal from high-pressure coal gasification gas streams. The purpose of this study is to perform a preliminary energy study and develop a method to implement this sorbent in a power plant. The proposed CO2 removal process involves sorption of CO2 at 200―300 °C and regeneration at 385 °C. The operational temperature is ideal for CO2 capture downstream to the water―gas shift reactor in an integrated gasification combined cycle (IGCC) power plant but is applicable to other warm gas cleanup processes as well. This technology offers the ability to fully utilize the potential efficiency increases associated with warm gas clean up. Additionally, the sorbent is able to operate in the presence of steam, which distinguishes it from other technologies that require an energy-intensive drying step prior to CO2 separation. Regeneration is carried out at 280 psi and 400 °C, resulting in a high-pressure CO2 product stream, which significantly reduces the auxiliary load normally associated with CO2 compression for sequestration. The chemistry of the sorption process also reduces the amount of steam traditionally required for the water-gas shift reactor by 50%, increasing the overall efficiency of the plant. The incorporation of the sorbent and the described methods resulted in an overall IGCC power plant efficiency greater than that of the competing Selexol technology. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25783436

Zeolite - based process for CO2 capture from high - pressure, moderate - temperature gas streams / James C. Fisher in Industrial & engineering chemistry research, Vol. 50 N° 24 (Décembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 24 (Décembre 2011) . - pp. 13962–13968 Titre : Zeolite - based process for CO2 capture from high - pressure, moderate - temperature gas streams Type de document : texte imprimé Auteurs : James C. Fisher, Auteur ; Ranjani V. Siriwardane, Auteur ; Robert W. Stevens, Auteur Année de publication : 2012 Article en page(s) : pp. 13962–13968 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Zeolite  Gas  streams Résumé : A novel CO2 capture process was developed using a zeolite suitable for CO2 removal at warm-gas temperatures in high-pressure coal gasification gas streams. The process involves sorption of CO2 at 150 °C and regeneration at 350 °C. Regeneration at 350 °C removes the moisture absorbed during CO2 sorption. This sorption temperature is ideal for CO2 removal downstream of the water gas shift reactor in an integrated gasification combined cycle (IGCC) power plant but is also applicable to other warm gas cleanup processes. Most solvent-based processes require energy-intensive drying to remove moisture prior to CO2 removal. Using zeolites for CO2 capture at 150 °C and regeneration at 350 °C eliminates the problem with moisture in the gas stream traditionally causing deactivation of the zeolite. The results of using this capture scheme in an IGCC power plant is advantageous because of the high-pressure CO2 product stream and because removal of CO2 and H2O from the syngas generates high-quality H2 for the combustion turbines. In the example used in this work, the resulting CO2 stream separated from the fuel gas is delivered at 280 psi significantly reducing the energy required for compression from 27.6 MW in the EPRI report utilizing Selexol to 9.9 MW in this work. The overall thermal efficiency of the plant utilizing this CO2 removal scheme was estimated at 36.5, which is 0.5% less than the comparable Selxol plant. However, this process, combined with other warm gas cleanup technologies, offers the ability to significantly reduce the auxiliary load associated with syngas clean up, thereby increasing overall power plant efficiency. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201666g [article] Zeolite - based process for CO2 capture from high - pressure, moderate - temperature gas streams [texte imprimé] / James C. Fisher, Auteur ; Ranjani V. Siriwardane, Auteur ; Robert W. Stevens, Auteur . - 2012 . - pp. 13962–13968. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 24 (Décembre 2011) . - pp. 13962–13968 Mots-clés : Zeolite  Gas  streams Résumé : A novel CO2 capture process was developed using a zeolite suitable for CO2 removal at warm-gas temperatures in high-pressure coal gasification gas streams. The process involves sorption of CO2 at 150 °C and regeneration at 350 °C. Regeneration at 350 °C removes the moisture absorbed during CO2 sorption. This sorption temperature is ideal for CO2 removal downstream of the water gas shift reactor in an integrated gasification combined cycle (IGCC) power plant but is also applicable to other warm gas cleanup processes. Most solvent-based processes require energy-intensive drying to remove moisture prior to CO2 removal. Using zeolites for CO2 capture at 150 °C and regeneration at 350 °C eliminates the problem with moisture in the gas stream traditionally causing deactivation of the zeolite. The results of using this capture scheme in an IGCC power plant is advantageous because of the high-pressure CO2 product stream and because removal of CO2 and H2O from the syngas generates high-quality H2 for the combustion turbines. In the example used in this work, the resulting CO2 stream separated from the fuel gas is delivered at 280 psi significantly reducing the energy required for compression from 27.6 MW in the EPRI report utilizing Selexol to 9.9 MW in this work. The overall thermal efficiency of the plant utilizing this CO2 removal scheme was estimated at 36.5, which is 0.5% less than the comparable Selxol plant. However, this process, combined with other warm gas cleanup technologies, offers the ability to significantly reduce the auxiliary load associated with syngas clean up, thereby increasing overall power plant efficiency. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201666g