Cycling performance of composite hematite and copper ore oxygen carrier in chemical looping combustion

被引：0
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作者：
Miao, Zhenwu [1 ]
Shen, Laihong [1 ]
Zhao, Haibo [2 ]
机构：
[1] Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing,210096, China
[2] Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan,430074, China
来源：
Chemical Engineering Journal | 2023年 / 452卷
关键词：
A single natural ore oxygen carrier (OC) has a limited industrial application due to its weak reactivity and cyclic stability. For the composite hematite and copper ore OC prepared by spray drying granulation; long-term chemical looping combustion (CLC) cycle tests were performed on a fluidized bed thermogravimetric analyzer (FB-TGA). The results showed that a substantial mechanical stress and the presence of partially enriched fine particles on the surface of new OC particles caused a high attrition rate of OC at the early stage of fluidization. After 6 min; the attrition rate of the particle was stabilized at 0.28 %/h. The OC was subjected to chemical and thermal stresses during the redox cycle reaction; which decreased the mechanical strength and increased particle attrition and sintering. The particle sintering also hindered the oxidation stage; which led to a deep reduction of OC to a lower valence state; which drove particle agglomeration and eventual defluidization. Therefore; lowering the oxygen transfer capacity and residence time in the fuel reactor is beneficial for the safe operation of OC in industry. © 2022 Elsevier B.V;
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