CaMn0.875Ti0.125O3 as oxygen carrier for chemical-looping combustion with oxygen uncoupling (CLOU)—Experiments in a continuously operating fluidized-bed reactor system
KAUST Grant NumberKUK-F1-023-02
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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.
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.
SponsorsThis 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.