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

Lingqin Liu, Guo Chen, Yaji Huang, Changqi Liu, Xinye Wang and Mengzhu Yu

Energy, 2025, vol. 331, issue C

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.

Keywords: Biomass; Gasification; Secondary oxygen; Tar; Two-stage fluidized bed (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:331:y:2025:i:c:s0360544225027021

DOI: 10.1016/j.energy.2025.137060

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