Development and performance of binder-supported CaSO₄ oxygen carriers for chemical looping combustion

Chemical-looping combustion (CLC) has been recognized as an energy-efficient method for CO₂ capture. For calcium sulfate (CaSO₄) oxygen carrier, the rapid fall in the mechanical strength and reactivity limits its application in CLC. In this study, Taguchi robust design method with L₉ orthogonal arra...

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Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2011-07, Vol.171 (3), p.1018-1026
Main Authors: Ding, Ning, Zheng, Ying, Luo, Cong, Wu, Qi-long, Fu, Pei-fang, Zheng, Chu-guang
Format: Article
Language:English
Subjects:
acetic acid
Applied sciences
calcium sulfate
Chemical engineering
combustion
energy efficiency
Exact sciences and technology
extrusion
grains
oxygen
Reactors
scanning electron microscopes
surface area
thermal stability
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Summary:Chemical-looping combustion (CLC) has been recognized as an energy-efficient method for CO₂ capture. For calcium sulfate (CaSO₄) oxygen carrier, the rapid fall in the mechanical strength and reactivity limits its application in CLC. In this study, Taguchi robust design method with L₉ orthogonal array was implemented to optimize extrusion condition for the preparation of binder-supported CaSO₄ oxygen carriers. The orthogonal experiment results showed the addition of SB powder enhanced both mechanical strength and conversion of CaSO₄, and the optimal extrusion condition was 30g CaSO₄, 12g SB powder, 2.5mL acetic acid, and 15mL water. The favorable oxygen carriers were comprehensively studied in a fixed bed reactor. The results of reduction test showed the mass-based reaction rates of the binder-supported CaSO₄ were significantly increased, because the fresh samples had the higher surface area which was evidenced by pore structure analysis. Moreover, the favorable performance of binder-supported CaSO₄ was explained by formation of CaAl₂O₄ which had excellent thermal stability and provided a stable nanosized framework between the crystal grains observed by field emission scanning electron microscope (FESEM).
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2011.04.054