SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2021, Vol. 37 ›› Issue (9): 168-174.DOI: 10.1016/j.cjche.2020.11.034

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Effect of supports on the redox performance of pyrite cinder in chemical looping combustion

Zhong Ma1,2, Chuan Yuan1, Shuai Zhang3, Yonggang Lu1, Junhui Xiong1   

  1. 1. School of Energy & Power Engineering, Jiangsu University, Zhenjiang 212013, China;
    2. State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China;
    3. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China
  • Received:2020-08-02 Revised:2020-10-22 Online:2021-11-02 Published:2021-09-28
  • Contact: Zhong Ma
  • Supported by:
    This work was supported by the Program for High-Level Entrepreneurial and Innovative Talents Introduction of Jiangsu Province, Foundation of State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering (2021-K56), Foundation of Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education and Senior Talent Foundation of Jiangsu University (20JDG40).

Effect of supports on the redox performance of pyrite cinder in chemical looping combustion

Zhong Ma1,2, Chuan Yuan1, Shuai Zhang3, Yonggang Lu1, Junhui Xiong1   

  1. 1. School of Energy & Power Engineering, Jiangsu University, Zhenjiang 212013, China;
    2. State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China;
    3. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China
  • 通讯作者: Zhong Ma
  • 基金资助:
    This work was supported by the Program for High-Level Entrepreneurial and Innovative Talents Introduction of Jiangsu Province, Foundation of State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering (2021-K56), Foundation of Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education and Senior Talent Foundation of Jiangsu University (20JDG40).

Abstract: Chemical looping combustion (CLC) is a clean and efficient flame-free combustion technology, which combust the fuels by lattice oxygen from a solid oxygen carrier with inherent CO2 capture. The development of oxygen carriers with low cost and high redox performance is crucial to the whole efficiency of CLC process. As the solid by-product from the sulfuric acid production, pyrite cinder presented excellent redox performance as an oxygen carrier in CLC process. The main components in pyrite cinder are Fe2O3, CaSO4, Al2O3 and SiO2 in which Fe2O3 is the active component to provide lattice oxygen. In order to systematic investigate the functions of supports (CaSO4, Al2O3 and SiO2) in pyrite cinder, three oxygen carriers (Fe2O3-CaSO4, Fe2O3-Al2O3 and Fe2O3-SiO2) were prepared and evaluated in this study. The results showed that Fe2O3-CaSO4 displayed high redox activity and cycling stability in the multiple redox cycles. However, both Fe2O3-Al2O3 and Fe2O3-SiO2 experienced serious deactivation during redox reactions. It indicated that the inert Fe-Si solid solution (Fe2SiO4) was formed in the spent Fe2O3-SiO2 sample, which decreased the oxygen carrying capacity of this sample. The XPS results showed that the oxygen species on the surface of Fe2O3-CaSO4 could be fully recovered after the 20 redox cycles. It can be concluded that CaSO4 is the key to the high redox activity and cycling stability of pyrite cinder.

Key words: Chemical looping, Pyrite cinder, Supports, Fixed-bed, Redox performance, Waste treatment

摘要: Chemical looping combustion (CLC) is a clean and efficient flame-free combustion technology, which combust the fuels by lattice oxygen from a solid oxygen carrier with inherent CO2 capture. The development of oxygen carriers with low cost and high redox performance is crucial to the whole efficiency of CLC process. As the solid by-product from the sulfuric acid production, pyrite cinder presented excellent redox performance as an oxygen carrier in CLC process. The main components in pyrite cinder are Fe2O3, CaSO4, Al2O3 and SiO2 in which Fe2O3 is the active component to provide lattice oxygen. In order to systematic investigate the functions of supports (CaSO4, Al2O3 and SiO2) in pyrite cinder, three oxygen carriers (Fe2O3-CaSO4, Fe2O3-Al2O3 and Fe2O3-SiO2) were prepared and evaluated in this study. The results showed that Fe2O3-CaSO4 displayed high redox activity and cycling stability in the multiple redox cycles. However, both Fe2O3-Al2O3 and Fe2O3-SiO2 experienced serious deactivation during redox reactions. It indicated that the inert Fe-Si solid solution (Fe2SiO4) was formed in the spent Fe2O3-SiO2 sample, which decreased the oxygen carrying capacity of this sample. The XPS results showed that the oxygen species on the surface of Fe2O3-CaSO4 could be fully recovered after the 20 redox cycles. It can be concluded that CaSO4 is the key to the high redox activity and cycling stability of pyrite cinder.

关键词: Chemical looping, Pyrite cinder, Supports, Fixed-bed, Redox performance, Waste treatment