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Investigation of rice straw gasification in a two-stage fluidized bed gasifier

Author

Listed:
  • Liu, Lingqin
  • Chen, Guo
  • Huang, Yaji
  • Liu, Changqi
  • Wang, Xinye
  • Yu, Mengzhu

Abstract

To enhance biomass utilization, this study conducts rice straw air gasification in a two-stage fluidized bed, focusing on gasification temperature (600 °C–800 °C), equivalence ratio (0.15–0.24), secondary oxygen ratio (0–38.11 %), and dilute phase temperature (730 °C and 800 °C) on gasification characteristics (gas composition, gas yield, heating value, carbon conversion efficiency and gasification efficiency) and exploring the influence of secondary oxygen ratio (0–7.62 %) on tar characteristics. Gas composition and tar characteristics are analyzed by GC, MRU gas analyzer and GC-MS. Results show increased temperature boosts gasification. Conversely, increased ER has an opposing effect. Introducing secondary oxygen (0–7.62 %) rises gasification efficiency (38.24 %–42.95 %) and carbon conversion rate (70.27 %–74.59 %), promoting the gasification process. However, as secondary oxygen ratio increases (7.62 %–38.11 %), gas yield (1.18 m3/kg - 1.00 m3/kg) and gasification efficiency (42.95 %–40.14 %) decrease. The optimal secondary oxygen ratio is 15.24 %, achieving 75.21 % carbon conversion, when the gas yield, heating value, and gasification efficiency are 1.144 m3/kg, 5.34 MJ/m3, and 42.78 %, respectively. Besides, higher temperature in dilute phase region promotes the gasification process. After introducing secondary oxygen (0–7.62 %), tar content decreases (16.69 g/m3 - 11.01 g/m3), polycyclic aromatic hydrocarbons increase (25.55 %–42.63 %) and monocyclic aromatic hydrocarbons decrease by 15.02 %. Tar aromatization enhances. This study offers green rice straw process for low-tar, high-quality syngas, guiding biomass gasification research.

Suggested Citation

  • Liu, Lingqin & Chen, Guo & Huang, Yaji & Liu, Changqi & Wang, Xinye & Yu, Mengzhu, 2025. "Investigation of rice straw gasification in a two-stage fluidized bed gasifier," Energy, Elsevier, vol. 331(C).
    • Handle: RePEc:eee:energy:v:331:y:2025:i:c:s0360544225027021
    DOI: 10.1016/j.energy.2025.137060
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    References listed on IDEAS

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