Citation: CHENG Dan-yan, YONG Qi-run, GONG Ben-gen, ZHAO Yong-chun, ZHANG Jun-ying. Carbothermal interaction between Cu-based oxygen carrier and ash minerals in the chemical-looping gasification of coal and biomass[J]. Journal of Fuel Chemistry and Technology, ;2020, 48(1): 18-27. shu

Carbothermal interaction between Cu-based oxygen carrier and ash minerals in the chemical-looping gasification of coal and biomass

1.
State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China
2.
China-EU Institute for Clean and Renewable Energy, Huazhong University of Science and Technology, Wuhan 430074, China

Corresponding author: ZHANG Jun-ying, jyzhang@hust.edu.cn
Received Date: 12 August 2019
Revised Date: 20 November 2019

Fund Project: National Natural Science Foundation of China 41672148The project was supported by National Natural Science Foundation of China (41672148)

Figures(11)

The carbothermal interaction between Cu-based oxygen carrier and ash minerals in the chemical-looping gasification of coal and biomass were investigated experimentally by considering three factors of reaction temperature, type of ash and ash content. The chemical-looping gasification was simulated by reciprocally switching the redox atmosphere of the fixed bed and the products were characterized by XRD and SEM-EDS and analyzed by thermodynamic calculation. The results show that Fe₂O₃ and Al₂O₃ in the coal ash can easily react with CuO/Cu₂O, forming complexes such as CuAl₂O₄, Cu₂Fe₂O₄ and CuFe₂O₄, which are difficult to reduce. However, CaO can alleviate the sintering of Cu-based oxygen carriers by hindering the formation of Cu-Al and Cu-Si complexes. The increase of reaction temperature promotes the solid-solid reaction of CuO with silicate minerals such as CaSiO₃ and MgSiO₃, producing CaCuSi₂O₆ and CuMgSi₂O₆ and reducing the reactivity of Cu-based oxygen carriers. With the increase of ash content, Ca₂Fe₉O₁₃ generated from Ca²⁺ and Fe³⁺ can react with SiO₂, forming three-phase eutectic CaFeSi₂O₆ with a high-melting point, which co-fuses with Cu-based oxygen carrier and covers the surface of the oxygen carrier, leading to a decrease in the oxygen release performance.
- mineral carbothermal reaction,
- Cu-based oxygen carriers,
- ash,
- chemical-looping gasification,
- coal,
- biomass
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