CaMn0.875Ti0.125O3 as oxygen carrier for chemical-looping combustion with oxygen uncoupling (CLOU)—Experiments in a continuously operating fluidized-bed reactor system

Handle URI:
http://hdl.handle.net/10754/597717
Title:
CaMn0.875Ti0.125O3 as oxygen carrier for chemical-looping combustion with oxygen uncoupling (CLOU)—Experiments in a continuously operating fluidized-bed reactor system
Authors:
Rydén, Magnus; Lyngfelt, Anders; Mattisson, Tobias
Abstract:
Particles of the perovskite material CaMn0.875Ti0.125O3 has been examined as oxygen carrier for chemical-looping with oxygen uncoupling, and for chemical-looping combustion of natural gas, by 70h of experiments in a circulating fluidized-bed reactor system. For the oxygen uncoupling experiments, it was found that the particles released O2 in gas phase at temperatures above 720°C when the fuel reactor was fluidized with CO2. The effect increased with increased temperature, and with the O2 partial pressure in the air reactor. At 950°C, the O2 concentration in the outlet from the fuel reactor was in the order of 4.0vol%, if the particles were oxidized in air. For the chemical-looping combustion experiments the combustion efficiency with standard process parameters was in the order of 95% at 950°C, using 1000kg oxygen carrier per MW natural gas, of which about 30% was located in the fuel reactor. Reducing the fuel flow so that 1900kg oxygen carrier per MW natural gas was used improved the combustion efficiency to roughly 99.8%. The particles retained their physical properties, reactivity with CH4 and ability to release gas-phase O2 reasonably well throughout the testing period and there were no problems with the fluidization or formation of solid carbon in the reactor. X-ray diffraction showed that the particles underwent changes in their phase composition though. © 2010 Elsevier Ltd.
Citation:
Rydén M, Lyngfelt A, Mattisson T (2011) CaMn0.875Ti0.125O3 as oxygen carrier for chemical-looping combustion with oxygen uncoupling (CLOU)—Experiments in a continuously operating fluidized-bed reactor system. International Journal of Greenhouse Gas Control 5: 356–366. Available: http://dx.doi.org/10.1016/j.ijggc.2010.08.004.
Publisher:
Elsevier BV
Journal:
International Journal of Greenhouse Gas Control
KAUST Grant Number:
KUK-F1-023-02
Issue Date:
Mar-2011
DOI:
10.1016/j.ijggc.2010.08.004
Type:
Article
ISSN:
1750-5836
Sponsors:
This publication was based on work supported by Award No. KUK-F1-023-02, made by King Abdullah University of Science and Technology (KAUST). The CaMn<INF>0.875</INF>Ti<INF>0.125</INF>O<INF>3</INF> particles used for the study were developed and manufactured by SINTEF. The batch experiments described in Section 4.4 was conducted by Sebastian Sundqvist and is a part of a larger work which is being carried out at the department of Chemical and Biological Engineering at Chalmers University of Technology.
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Full metadata record

DC FieldValue Language
dc.contributor.authorRydén, Magnusen
dc.contributor.authorLyngfelt, Andersen
dc.contributor.authorMattisson, Tobiasen
dc.date.accessioned2016-02-25T12:55:26Zen
dc.date.available2016-02-25T12:55:26Zen
dc.date.issued2011-03en
dc.identifier.citationRydén M, Lyngfelt A, Mattisson T (2011) CaMn0.875Ti0.125O3 as oxygen carrier for chemical-looping combustion with oxygen uncoupling (CLOU)—Experiments in a continuously operating fluidized-bed reactor system. International Journal of Greenhouse Gas Control 5: 356–366. Available: http://dx.doi.org/10.1016/j.ijggc.2010.08.004.en
dc.identifier.issn1750-5836en
dc.identifier.doi10.1016/j.ijggc.2010.08.004en
dc.identifier.urihttp://hdl.handle.net/10754/597717en
dc.description.abstractParticles of the perovskite material CaMn0.875Ti0.125O3 has been examined as oxygen carrier for chemical-looping with oxygen uncoupling, and for chemical-looping combustion of natural gas, by 70h of experiments in a circulating fluidized-bed reactor system. For the oxygen uncoupling experiments, it was found that the particles released O2 in gas phase at temperatures above 720°C when the fuel reactor was fluidized with CO2. The effect increased with increased temperature, and with the O2 partial pressure in the air reactor. At 950°C, the O2 concentration in the outlet from the fuel reactor was in the order of 4.0vol%, if the particles were oxidized in air. For the chemical-looping combustion experiments the combustion efficiency with standard process parameters was in the order of 95% at 950°C, using 1000kg oxygen carrier per MW natural gas, of which about 30% was located in the fuel reactor. Reducing the fuel flow so that 1900kg oxygen carrier per MW natural gas was used improved the combustion efficiency to roughly 99.8%. The particles retained their physical properties, reactivity with CH4 and ability to release gas-phase O2 reasonably well throughout the testing period and there were no problems with the fluidization or formation of solid carbon in the reactor. X-ray diffraction showed that the particles underwent changes in their phase composition though. © 2010 Elsevier Ltd.en
dc.description.sponsorshipThis publication was based on work supported by Award No. KUK-F1-023-02, made by King Abdullah University of Science and Technology (KAUST). The CaMn<INF>0.875</INF>Ti<INF>0.125</INF>O<INF>3</INF> particles used for the study were developed and manufactured by SINTEF. The batch experiments described in Section 4.4 was conducted by Sebastian Sundqvist and is a part of a larger work which is being carried out at the department of Chemical and Biological Engineering at Chalmers University of Technology.en
dc.publisherElsevier BVen
dc.subjectCaMn0.875Ti0.125O3en
dc.subjectCaMnO3en
dc.subjectChemical-looping combustionen
dc.subjectChemical-looping with oxygen uncouplingen
dc.titleCaMn0.875Ti0.125O3 as oxygen carrier for chemical-looping combustion with oxygen uncoupling (CLOU)—Experiments in a continuously operating fluidized-bed reactor systemen
dc.typeArticleen
dc.identifier.journalInternational Journal of Greenhouse Gas Controlen
dc.contributor.institutionChalmers University of Technology, Göteborg, Swedenen
kaust.grant.numberKUK-F1-023-02en
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