Calcium-looping for post-combustion CO2 capture. On the adverse effect of sorbent regeneration under CO2

The multicyclic carbonation/calcination (c/c) of CaO solid particles at high temperature is at the basis of the recently emerged Calcium-looping (CaL) technology, which has been shown to be potentially suitable for achieving high and sustainable post-combustion CO2 capture efficiency. Despite the su...

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Autores: Valverde Millán, José Manuel, Sánchez Jiménez, Pedro Enrique, Pérez Maqueda, Luis Allan
Tipo de recurso: artículo
Estado:Versión enviada para evaluación y publicación
Fecha de publicación:2014
País:España
Institución:Universidad de Sevilla (US)
Repositorio:idUS. Depósito de Investigación de la Universidad de Sevilla
OAI Identifier:oai:idus.us.es:11441/74160
Acceso en línea:https://hdl.handle.net/11441/74160
https://doi.org/10.1016/j.apenergy.2014.03.081
Access Level:acceso abierto
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spelling Calcium-looping for post-combustion CO2 capture. On the adverse effect of sorbent regeneration under CO2Valverde Millán, José ManuelSánchez Jiménez, Pedro EnriquePérez Maqueda, Luis AllanThe multicyclic carbonation/calcination (c/c) of CaO solid particles at high temperature is at the basis of the recently emerged Calcium-looping (CaL) technology, which has been shown to be potentially suitable for achieving high and sustainable post-combustion CO2 capture efficiency. Despite the success of pilot plant projects at the MWth scale, a matter of concern for scaling-up the CaL technology to a commercial level (to the GWth scale) is that the CaO carbonation reactivity can be recovered only partially when the sorbent is regenerated by calcination at high temperatures (around 950 °C) as required by the CO2 high concentration in the calciner. In order to reactivate the sorbent, a novel CaL concept has been proposed wherein a recarbonator reactor operated at high temperature/high CO2 concentration leads to further carbonation of the solids before entering into the calciner for regeneration. Multicyclic thermogravimetric analysis (TGA) tests demonstrate the feasibility of recarbonation to reactivate the sorbent regenerated at high calcination temperatures yet at unrealistically low CO2 partial pressure mainly because of technical limitations concerning low heating/cooling rates. We report results from multicyclic c/c and carbonation/recarbonation/calcination (c/r/c) TGA tests at high heating/coling rates and in which the sorbent is regenerated in a dry atmosphere at high CO2 partial pressure. It is shown that at these conditions there is a drastic drop of CaO conversion to a very small residual value in just a few cycles. Moreover, the introduction of a recarbonation stage has actually an adverse effect. Arguably, CaCO3 decomposition in a CO2 rich atmosphere is ruled by CO2 dynamic adsorption/desorption in reactive CaO (1 1 1) surfaces as suggested by theoretical studies, which would preclude the growth of the regenerated CaO crystal structure along these reactive surfaces, and this effect would be intensified by recarbonation. Nevertheless, the presence of H2O in the calciner, which is also adsorbed/desorbed dynamically in CaO reactive planes, would shield CO2 adsorption/desorption thus mitigating the deeply detrimental effect of CO2 on the carbonation reactivity of the regenerated CaO structure. Oxy-combustion, which produces a significant amount of H2O, is currently used in pilot-scale plants to raise the temperature in the calciner. Auxiliary techniques are being explored to help heating the partially carbonated solids since oxyxombustion represents an important penalty to the CaL technology. Our study suggests that steam injection would be necessary in a dry calciner environment to avoid a sharp loss of CaO conversion if the sorbent is regenerated at high CO2 partial pressure.Junta de Andalucía FQM-5735 TEP-7858España Mineco Feder FIS2011-25161 CTQ2011-27626ElsevierQuímica InorgánicaElectrónica y Electromagnetismo2014info:eu-repo/semantics/articleinfo:eu-repo/semantics/submittedVersionapplication/pdfapplication/pdfhttps://hdl.handle.net/11441/74160https://doi.org/10.1016/j.apenergy.2014.03.081reponame:idUS. Depósito de Investigación de la Universidad de Sevillainstname:Universidad de Sevilla (US)InglésApplied Energy, 126 (1), 161-171.FQM-5735TEP-7858FIS2011-25161CTQ2011-27626http://dx.doi.org/10.1016/j.apenergy.2014.03.081info:eu-repo/semantics/openAccessoai:idus.us.es:11441/741602026-06-17T12:51:07Z
dc.title.none.fl_str_mv Calcium-looping for post-combustion CO2 capture. On the adverse effect of sorbent regeneration under CO2
title Calcium-looping for post-combustion CO2 capture. On the adverse effect of sorbent regeneration under CO2
spellingShingle Calcium-looping for post-combustion CO2 capture. On the adverse effect of sorbent regeneration under CO2
Valverde Millán, José Manuel
title_short Calcium-looping for post-combustion CO2 capture. On the adverse effect of sorbent regeneration under CO2
title_full Calcium-looping for post-combustion CO2 capture. On the adverse effect of sorbent regeneration under CO2
title_fullStr Calcium-looping for post-combustion CO2 capture. On the adverse effect of sorbent regeneration under CO2
title_full_unstemmed Calcium-looping for post-combustion CO2 capture. On the adverse effect of sorbent regeneration under CO2
title_sort Calcium-looping for post-combustion CO2 capture. On the adverse effect of sorbent regeneration under CO2
dc.creator.none.fl_str_mv Valverde Millán, José Manuel
Sánchez Jiménez, Pedro Enrique
Pérez Maqueda, Luis Allan
author Valverde Millán, José Manuel
author_facet Valverde Millán, José Manuel
Sánchez Jiménez, Pedro Enrique
Pérez Maqueda, Luis Allan
author_role author
author2 Sánchez Jiménez, Pedro Enrique
Pérez Maqueda, Luis Allan
author2_role author
author
dc.contributor.none.fl_str_mv Química Inorgánica
Electrónica y Electromagnetismo
description The multicyclic carbonation/calcination (c/c) of CaO solid particles at high temperature is at the basis of the recently emerged Calcium-looping (CaL) technology, which has been shown to be potentially suitable for achieving high and sustainable post-combustion CO2 capture efficiency. Despite the success of pilot plant projects at the MWth scale, a matter of concern for scaling-up the CaL technology to a commercial level (to the GWth scale) is that the CaO carbonation reactivity can be recovered only partially when the sorbent is regenerated by calcination at high temperatures (around 950 °C) as required by the CO2 high concentration in the calciner. In order to reactivate the sorbent, a novel CaL concept has been proposed wherein a recarbonator reactor operated at high temperature/high CO2 concentration leads to further carbonation of the solids before entering into the calciner for regeneration. Multicyclic thermogravimetric analysis (TGA) tests demonstrate the feasibility of recarbonation to reactivate the sorbent regenerated at high calcination temperatures yet at unrealistically low CO2 partial pressure mainly because of technical limitations concerning low heating/cooling rates. We report results from multicyclic c/c and carbonation/recarbonation/calcination (c/r/c) TGA tests at high heating/coling rates and in which the sorbent is regenerated in a dry atmosphere at high CO2 partial pressure. It is shown that at these conditions there is a drastic drop of CaO conversion to a very small residual value in just a few cycles. Moreover, the introduction of a recarbonation stage has actually an adverse effect. Arguably, CaCO3 decomposition in a CO2 rich atmosphere is ruled by CO2 dynamic adsorption/desorption in reactive CaO (1 1 1) surfaces as suggested by theoretical studies, which would preclude the growth of the regenerated CaO crystal structure along these reactive surfaces, and this effect would be intensified by recarbonation. Nevertheless, the presence of H2O in the calciner, which is also adsorbed/desorbed dynamically in CaO reactive planes, would shield CO2 adsorption/desorption thus mitigating the deeply detrimental effect of CO2 on the carbonation reactivity of the regenerated CaO structure. Oxy-combustion, which produces a significant amount of H2O, is currently used in pilot-scale plants to raise the temperature in the calciner. Auxiliary techniques are being explored to help heating the partially carbonated solids since oxyxombustion represents an important penalty to the CaL technology. Our study suggests that steam injection would be necessary in a dry calciner environment to avoid a sharp loss of CaO conversion if the sorbent is regenerated at high CO2 partial pressure.
publishDate 2014
dc.date.none.fl_str_mv 2014
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/submittedVersion
format article
status_str submittedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/11441/74160
https://doi.org/10.1016/j.apenergy.2014.03.081
url https://hdl.handle.net/11441/74160
https://doi.org/10.1016/j.apenergy.2014.03.081
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Applied Energy, 126 (1), 161-171.
FQM-5735
TEP-7858
FIS2011-25161
CTQ2011-27626
http://dx.doi.org/10.1016/j.apenergy.2014.03.081
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:idUS. Depósito de Investigación de la Universidad de Sevilla
instname:Universidad de Sevilla (US)
instname_str Universidad de Sevilla (US)
reponame_str idUS. Depósito de Investigación de la Universidad de Sevilla
collection idUS. Depósito de Investigación de la Universidad de Sevilla
repository.name.fl_str_mv
repository.mail.fl_str_mv
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