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Optimization of operating parameters for tar reforming/hydrogen upgrading in corn straw pyrolysis polygeneration

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  • Sun, Hongliang
  • Feng, Dongdong
  • Zhao, Yijun
  • Sun, Shaozeng

Abstract

Regulation of operating parameters is crucial in biomass pyrolysis polygeneration. A two-stage reaction system was used to investigate the biochar catalytic reforming of corn straw pyrolysis tar. The effects of pyrolysis temperature (500 °C–800 °C), catalytic temperature (600 °C–750 °C) and steam content (0 vol%∼40 vol%) were studied and analyzed. GC-MS, Raman, FTIR, N2 adsorption and TG were used in the analysis of tar and biochar. The most suitable operating parameters were finally determined, namely, pyrolysis temperature of 800 °C, catalytic temperature of 700 °C and addition of 30 vol% steam. With these parameter settings, tar is almost completely removed, and the H2 yield reaches the highest 0.197 L/g. As the pyrolysis temperature increases, the tar yield decreases continuously and the yields of CH4, CO and H2 increase significantly. 600 °C–700 °C is the preferred catalytic temperature range for biochar, and 650 °C is the most suitable catalytic temperature for biochar, at which the tar yield is reduced to 0.15%. The H2 yield gradually increases with increasing catalytic temperature, while the CH4 and CO yields reach their highest values at 700 °C. The addition of steam reduces the tar yield to a much lower level and its value is no longer available by laboratory methods. Styrene, Indene and Naphthalene are completely converted. When 30 vol%∼40 vol% of steam is added, the Toluene peak area drops to less than 30% of that without steam. The addition of steam also promotes the methane steam reforming and the water-gas shift reaction. The H2 yield is significantly increased.

Suggested Citation

  • Sun, Hongliang & Feng, Dongdong & Zhao, Yijun & Sun, Shaozeng, 2023. "Optimization of operating parameters for tar reforming/hydrogen upgrading in corn straw pyrolysis polygeneration," Renewable Energy, Elsevier, vol. 214(C), pages 1-10.
  • Handle: RePEc:eee:renene:v:214:y:2023:i:c:p:1-10
    DOI: 10.1016/j.renene.2023.06.010
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    References listed on IDEAS

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