Effect of operating conditions in Chemical-Looping Combustion of coal in a 500 Wth unit

10 pages

Detalles Bibliográficos
Autores: Cuadrat, Ana, Abad Secades, Alberto, García Labiano, Francisco, Gayán Sanz, Pilar, Diego Poza, Luis F. de, Adánez Elorza, Juan
Tipo de recurso: artículo
Fecha de publicación:2011
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/75123
Acceso en línea:http://hdl.handle.net/10261/75123
Access Level:acceso abierto
Palabra clave:Chemical looping combustion
Oxygen-carrier
Ilmenite
CO2 capture
Coal
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spelling Effect of operating conditions in Chemical-Looping Combustion of coal in a 500 Wth unitCuadrat, AnaAbad Secades, AlbertoGarcía Labiano, FranciscoGayán Sanz, PilarDiego Poza, Luis F. deAdánez Elorza, JuanChemical looping combustionOxygen-carrierIlmeniteCO2 captureCoal10 pagesChemical-Looping Combustion, CLC, is one of the most promising processes to capture CO2 at a low cost. It is based on the transfer of the oxygen from air to the fuel by using a solid oxygen-carrier that circulates between two interconnected fluidized-bed reactors: the fuel- and the air-reactor. The CO2 capture is inherent to this process, as the air does not get mixed with the fuel. In this work, the CLC technology with coal was investigated in a continuous 500 Wth rig using ilmenite as oxygen-carrier. The plant was basically composed of two interconnected fluidizedbed reactors, a riser for solids transport from the air- to the fuel-reactor, a solid valve to control the flow rate of solids fed to the fuel-reactor and a cyclone. A Colombian bituminous coal is fed by a screw feeder at the bottom of the bed. In the fuel-reactor the oxygen-carrier is reduced by the volatile matter and gasification products of coal. Reduced oxygen-carrier particles were led to the air-reactor where they were re-oxidized and got ready to start a new cycle. This work is focused on the study of the fuel-reactor within the process. The behaviour of the fuel-reactor has been evaluated for different operational conditions. The effect of operating conditions such as the solids circulation rate and the resulting oxygen-carrier and fuel residence times, the coal flow feed and the gasification agent flow were investigated on the combustion efficiency and the extent of gasification in the fuel-reactor. The fluidizing gas, which also acts as gasification agent, was steam. Besides, the influence of using CO2 as gasification agent was assessed by doing experiments with different CO2-H2O mixtures. The experiments were carried out at about 900ºC in the fuel-reactor. The results obtained are valid for the scale-up of a CLC process fuelled with coal. They indicate that it is feasible to decrease the gasification agent feeding flow to lower values than the corresponding stoichiometric flow for the fixed carbon gasification, and that some of the steam as gasification agent can be replaced by CO2 recirculated from the outlet fuel-reactor flow. Low circulation rate of solids improved the coal conversion in the fuel-reactor.This work was partially supported by the European Commission, under the RFCS program (ECLAIR Project, Contract RFCP-CT-2008-0008), from Alstom Power Boilers and by the Spanish Ministry of Science and Innovation (Project ENE2010-19550). A. Cuadrat thanks CSIC for the JAE Pre. fellowship.Peer reviewedElsevier201320132011info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/75123reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1016/j.ijggc.2011.10.013info:eu-repo/semantics/openAccessoai:digital.csic.es:10261/751232026-05-22T06:33:51Z
dc.title.none.fl_str_mv Effect of operating conditions in Chemical-Looping Combustion of coal in a 500 Wth unit
title Effect of operating conditions in Chemical-Looping Combustion of coal in a 500 Wth unit
spellingShingle Effect of operating conditions in Chemical-Looping Combustion of coal in a 500 Wth unit
Cuadrat, Ana
Chemical looping combustion
Oxygen-carrier
Ilmenite
CO2 capture
Coal
title_short Effect of operating conditions in Chemical-Looping Combustion of coal in a 500 Wth unit
title_full Effect of operating conditions in Chemical-Looping Combustion of coal in a 500 Wth unit
title_fullStr Effect of operating conditions in Chemical-Looping Combustion of coal in a 500 Wth unit
title_full_unstemmed Effect of operating conditions in Chemical-Looping Combustion of coal in a 500 Wth unit
title_sort Effect of operating conditions in Chemical-Looping Combustion of coal in a 500 Wth unit
dc.creator.none.fl_str_mv Cuadrat, Ana
Abad Secades, Alberto
García Labiano, Francisco
Gayán Sanz, Pilar
Diego Poza, Luis F. de
Adánez Elorza, Juan
author Cuadrat, Ana
author_facet Cuadrat, Ana
Abad Secades, Alberto
García Labiano, Francisco
Gayán Sanz, Pilar
Diego Poza, Luis F. de
Adánez Elorza, Juan
author_role author
author2 Abad Secades, Alberto
García Labiano, Francisco
Gayán Sanz, Pilar
Diego Poza, Luis F. de
Adánez Elorza, Juan
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Chemical looping combustion
Oxygen-carrier
Ilmenite
CO2 capture
Coal
topic Chemical looping combustion
Oxygen-carrier
Ilmenite
CO2 capture
Coal
description 10 pages
publishDate 2011
dc.date.none.fl_str_mv 2011
2013
2013
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/75123
url http://hdl.handle.net/10261/75123
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1016/j.ijggc.2011.10.013
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869406232210571264
score 15,81155

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