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High-Quality Syngas Production by Chemical Looping Gasification of Bituminite Based on NiFe 2 O 4 Oxygen Carrier

Author

Listed:
  • Ming Yang

    (College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, China)

  • Da Song

    (College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, China
    Institute of Biomass Engineering, Key Laboratory of Energy Plants Resource and Utilization, Ministry of Agriculture and Rural Affairs, South China Agricultural University, Guangzhou 510642, China)

  • Yang Li

    (College of Chemistry and Engineering, Northeast Petroleum University, Daqing 163318, China)

  • Jinzeng Cao

    (Institute of Biomass Engineering, Key Laboratory of Energy Plants Resource and Utilization, Ministry of Agriculture and Rural Affairs, South China Agricultural University, Guangzhou 510642, China)

  • Guoqiang Wei

    (Institute of Biomass Engineering, Key Laboratory of Energy Plants Resource and Utilization, Ministry of Agriculture and Rural Affairs, South China Agricultural University, Guangzhou 510642, China)

  • Fang He

    (College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, China)

Abstract

Chemical looping gasification (CLG) is an effective coal utilization technology. In this work, the CLG of bituminite was investigated through fixed-bed batch experiments using NiFe 2 O 4 oxygen carrier (OC) to achieve high-quality syngas. The changes in the phase of the oxygen carrier during the chemical looping reaction and the reaction mechanism were explored. The results show that elevated temperature and adding a fraction of steam facilitate the gasification reaction. Adding an appropriate amount of ZrO 2 into the NiFe 2 O 4 and modification with alkali metal can enhance the performance of the oxygen carrier. A carbon conversion of 95% and a syngas (CO and H 2 ) selectivity of 86% were obtained under the optimized reaction conditions of 950 °C, an oxygen-carrier-to-bituminite (O/B) ratio of 7:3, a NiFe 2 O 4 /ZrO 2 ratio of 7:3, and a steam rate of 0.08 mL/min. Modification of the NiFe 2 O 4 by doping alkali metal can significantly facilitate the CLG process. Alkali lignin ash has a more pronounced modifying effect on oxygen carriers than K 2 CO 3 . The NiFe 2 O 4 OC underwent a gradual reduction in Ni 2+ → Ni and Fe 3+ → Fe 8/3+ → Fe 2+ → Fe processes during the gasification reaction phase. In addition, 20 redox cycles were conducted to demonstrate the oxygen carriers’ good cyclic reaction performance in the CLG process. After 20 redox cycles, the carbon conversion rate was maintained at about 90%, and the syngas selectivity was stably kept at over 80%. This work laid the theoretical foundation for the clean and efficient use of bituminite.

Suggested Citation

  • Ming Yang & Da Song & Yang Li & Jinzeng Cao & Guoqiang Wei & Fang He, 2023. "High-Quality Syngas Production by Chemical Looping Gasification of Bituminite Based on NiFe 2 O 4 Oxygen Carrier," Energies, MDPI, vol. 16(8), pages 1-17, April.
  • Handle: RePEc:gam:jeners:v:16:y:2023:i:8:p:3385-:d:1121628
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    References listed on IDEAS

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