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International Journal of Energy for a Clean Environment
SJR: 0.195 SNIP: 0.435 CiteScore™: 0.74

ISSN Print: 2150-3621
ISSN Online: 2150-363X

International Journal of Energy for a Clean Environment

Formerly Known as Clean Air: International Journal on Energy for a Clean Environment

DOI: 10.1615/InterJEnerCleanEnv.2018025370
pages 157-174

COMPARISON OF THE PERFORMANCE OF IRON ORE AND SYNTHETIC IRON-BASED OXYGEN CARRIER FOR CHEMICAL LOOPING COMBUSTION OF COAL

Ming Luo
School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangshu, 212013, China
Yang Yi
School of Energy and Power Engineering, Jiangsu University, Zhenjiang, 212013, China
Jianjun Cai
Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, PR China
Ke Liu
State Grid Shandong Electric Power Research Institute, Jinan, 250003, China
Chao Wang
School of Energy and Power Engineering, Jiangsu University, Zhenjiang, 212013, China
Qian Wang
School of Energy and Power Engineering, Jiangsu University, Zhenjiang, 212013, China

ABSTRACT

Chemical-looping combustion (CLC) is a new technology for the efficient conversion of fuels with inherent separation of carbon dioxide. Direct CLC of coal has recently attracted the attention of researchers, but no work has been done using the YiMin coal with high reserves with a local natural material being used as an oxygen carrier. In the present paper, experiments on coal direct CLC was carried out in a batch fluidized bed using the YiMin coal and two kinds of materials, i.e., synthetic Fe2O3/MgAl2O4 and natural iron ore as oxygen carriers. The performance of these two materials was compared and investigated. It was found that the reactivity of iron ore was comparable to that of Fe2O3/MgAl2O4. The carbon conversion when using iron ore (93.2%) as an oxygen carrier was similar to that when synthetic Fe2O3/MgAl2O4 (93.8%) was used. An increase in the temperature of the reactor produced a higher relative concentration of CO2, while the relative concentrations of combustible gases decreased when iron ore was used as an oxygen carrier. The high stability of the two materials was confirmed during 10 cyclic operation processes at 950°C. Only minor changes appeared in the surface morphology of the samples after redox reactions, but no severe surface sintering was observed. The interactions between two oxygen carriers and ash were detected, and it was found that the coal ash had no significant effect on those two materials after redox processes. Therefore, the preliminary experiments and data analyses prove that it is suitable for direct CLC of YiMin coal with local natural iron ore as an oxygen carrier.


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