Investigation into the Reactivity Behavior of CaSO₄ with Coal Chars in the Chemical Looping Combustion System

Abstract:

Chemical-looping combustion is a promising method to realize the near zero emissions of CO₂ without any excessive energy penalty. In this paper the reactivity behavior of calcium sulfate (CaSO4) as oxygen carrier (OC) with coal chars are investigated. After the impregnation of nickel ions or iron ions, the reacting behaviors of the OC are remarkably promoted comparing with that before the impregnation. The high impregnation of nickel ions or iron ions is beneficial to the reactivity of the OC, especially in the first half of the reaction. After the reaction of fresh CaSO₄ with coal chars, the solid products are merely CaS. In addition, the solid products of Ni-impregnated OC consist mainly of CaS, CaO and Ni₃S₂ while the solid products of Fe-impregnated OC are composed of Fe₃O₄ and CaS.

• Periodical: Advanced Materials Research (Volumes 724-725)
• Pages: 1158-1162
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.724-725.1158
• Online since: August 2013
• Authors: Hong Jing Tian, Jing Chang, Qing Jie Guo
• Keywords: Calcium Sulfate, Chemical-Looping Combustion, Oxygen Carrier, Solid Fuel

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