Citation: LIU Lang, LIU Qing-cai, MENG Fei, YANG Jian, KONG Ming, ZHAO Dong, ZHU Bo-hong, REN Shan. Reaction activity and structural characterizations of sintered return fine oxyen carriers in chemical-looping combustion[J]. Journal of Fuel Chemistry and Technology, ;2016, 44(10): 1177-1184. shu

Reaction activity and structural characterizations of sintered return fine oxyen carriers in chemical-looping combustion

LIU Lang ^1,2 ,
LIU Qing-cai ^2,*,, ,
MENG Fei ² ,
YANG Jian ² ,
KONG Ming ² ,
ZHAO Dong ² ,
ZHU Bo-hong ² ,
REN Shan ²

1.
School of Chemical Engineering, Guizhou Institue of Technology, Guizhou 550003, China
2.
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China

Corresponding author: LIU Qing-cai, liuqc@cqu.edu.cn
Received Date: 31 March 2016
Revised Date: 4 July 2016

Figures(10)

The reactivity and structural characterizations of the sintered iron ore in redox cycles were investigated. The sintered return fines were selected as oxygen carriers and the chemical looping combustion was tested in a fluidized bed with a reducing atmosphere of 95% methane. The characterizations of structural and physical properties of the sintered raw materials and the reduced and oxidative regenerated samples were conducted. The results reveal that during the initial oxidation cycle, the oxygen carrying capacity and reaction activity of the sinter are improved remarkably. The specific surface area of the sinter increases significantly in the first 25 cycles, which may be one of the main reasons for the reactivity increase of the sinter. During the recycling process, some cracks are formed on the surface of sintered return fines and gradually get development. The Raman results indicate that the new crystalline phase, lepidocrocite (γ-FeOOH), is formed, which will decrease the oxygen carrying capacity of the oxygen carrier. When the methane is used as the reducing gas, there is no carbon deposition on the surface.
- sintered return fines,
- chemical-looping combustion,
- structural characterizations,
- reaction activity
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