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<p>This study proposed an innovative biomass gasification hydrogen production pathway based on secondary reforming, aiming to address the low hydrogen yield caused by incomplete gasification in traditional processes. Eight typical biomass feedstocks were used as raw materials, and the complete process flow-comprising pretreatment, pyrolysis, gasification reforming, secondary reforming, syngas pressurization and low-temperature methanol washing-was simulated. The results were analyzed, and parameters optimized. Key parameters were determined through orthogonal experiments: gasification temperature (895&#xa0;°C), gasification pressure (1&#xa0;bar), and SBR (0.3&#xa0;kg·kg<sup>−</sup>¹). Under these conditions, the syngas components had the following molar fractions: 51.10% H<sub>2</sub>, 34.17% CO, 1.09% CO<sub>2</sub>, and 0.01% CH<sub>4</sub>. The lower heating value of the syngas was 254.2&#xa0;kJ·mol<sup>−</sup>¹, and the system’s exergy efficiency reached 70%. Compared to the traditional gasification process, secondary reforming nearly completely converted CH<sub>4</sub>, significantly improved H<sub>2</sub> selectivity, and increased system exergy efficiency by over 15%. Additionally, cow dung showed the highest H<sub>2</sub> yield and energy efficiency among all feedstocks. This study provided a new theoretical perspective on optimizing biomass gasification for hydrogen production, clarified how secondary reforming enhances H<sub>2</sub> selectivity and system efficiency, and offered theoretical support for future technical optimization.</p>

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Dual-Stage thermochemical conversion of eight biomass varieties for hydrogen production: synergistic multi-parameter optimization and exergy efficiency enhancement

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • Xin Yu,
  • Yan Gao,
  • Zhen Hou,
  • Shidan Chi,
  • Xiaoxu Zhang,
  • Haoyu Liu,
  • Jun Yan,
  • Guohong Tian,
  • Xudong Zhao

摘要

This study proposed an innovative biomass gasification hydrogen production pathway based on secondary reforming, aiming to address the low hydrogen yield caused by incomplete gasification in traditional processes. Eight typical biomass feedstocks were used as raw materials, and the complete process flow-comprising pretreatment, pyrolysis, gasification reforming, secondary reforming, syngas pressurization and low-temperature methanol washing-was simulated. The results were analyzed, and parameters optimized. Key parameters were determined through orthogonal experiments: gasification temperature (895 °C), gasification pressure (1 bar), and SBR (0.3 kg·kg−¹). Under these conditions, the syngas components had the following molar fractions: 51.10% H2, 34.17% CO, 1.09% CO2, and 0.01% CH4. The lower heating value of the syngas was 254.2 kJ·mol−¹, and the system’s exergy efficiency reached 70%. Compared to the traditional gasification process, secondary reforming nearly completely converted CH4, significantly improved H2 selectivity, and increased system exergy efficiency by over 15%. Additionally, cow dung showed the highest H2 yield and energy efficiency among all feedstocks. This study provided a new theoretical perspective on optimizing biomass gasification for hydrogen production, clarified how secondary reforming enhances H2 selectivity and system efficiency, and offered theoretical support for future technical optimization.