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Received December 4, 2010
Accepted March 23, 2011
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Chemical-looping combustion of syngas by means of spray-dried NiO oxygen carrier
Korea Electric Power Corporation Research Institute, Munji-ro 65, Yuseong-gu, Daejeon 305-380, Korea 1School of Chemical and Biological Engineering, Institute of Chemical Process, Seoul National University, San 56-1, Shillim-dong, Gwanak-gu, Seoul 151-742, Korea
Korean Journal of Chemical Engineering, November 2011, 28(11), 2211-2217(7), 10.1007/s11814-011-0079-4
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Abstract
Chemical-looping combustion (CLC) of syngas has a potential to generate power economically with achieving the inherent carbon dioxide capture. An oxygen carrier with high reactivity and excellent physical properties would make CLC technology more competitive. In this work, oxygen carrier with 70 wt% NiO was prepared by spray drying technique. The prepared oxygen carrier had excellent physical properties for fluidized-bed application of CLC process. The reactivity of the oxygen carrier in repeated reduction-oxidation was measured by thermogravimetric analyzer with simulated syngas. Oxygen carrier calcined at 1,100 ℃ showed high oxygen transfer capacity of 14.7 wt%, utilizing 98% of the transferable oxygen. Oxygen transfer capacity and oxygen transfer rate was increased with the increase of reaction temperature, and the highest oxygen transfer rate was observed when about half of the transferable oxygen reacted with syngas. The reduction rate of the syngas (mixture of H2 and CO) appeared to be approximately the sum of the reaction rate of each fuel gas. The experimental results indicated that the spray-dried NiO oxygen carrier prepared in this work could be a good quality oxygen carrier for the CLC of syngas.
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