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Gasification characteristics of sawdust char at a high-temperature steam atmosphere

Author

Listed:
  • Zhai, Ming
  • Liu, Jianing
  • Wang, Ze
  • Guo, Li
  • Wang, Xinyu
  • Zhang, Yu
  • Dong, Peng
  • Sun, Jiawei

Abstract

Gasification characteristics of sawdust char at a high-temperature steam atmosphere were experimentally studied in a fixed bed reactor. The char was prepared at 600–1400 °C. The effects of temperature, steam flow rate, reaction time and char preparation temperature on conversion rate, the composition of product gas, the pore structure of char and ash, as well as kinetics were analyzed. Gas chromatography, scanning electron microscopy, and a specific surface area analyzer were utilized to measure the composition of the gas, the surface morphology, and the specific surface area of the char and ash. Results show that the carbon conversion rate increases with temperature, steam flow rate, and reaction time. At 800–1200 °C, H2 content in product gas increases from 53.08% to 60.01%, and CO increases from 15.35% to 21.87%, while both CH4 and CO2 decrease. At 0.94–2.61 g/min, H2 in the product gas rapidly increases, but since CO decreases, H2 and CO slightly decrease. The specific surface area of sawdust ash increases to 948.84 m2/g and 987.61 m2/g at 800 °C and 1000 °C, respectively, on account of the fact that new micropores are generated, but it reduces to 520.76 m2/g at 1200 °C as a result of the decrease of micropores and mesopores. The surface reaction controlled shrinking core model can describe high-temperature steam gasification reaction of sawdust char.

Suggested Citation

  • Zhai, Ming & Liu, Jianing & Wang, Ze & Guo, Li & Wang, Xinyu & Zhang, Yu & Dong, Peng & Sun, Jiawei, 2017. "Gasification characteristics of sawdust char at a high-temperature steam atmosphere," Energy, Elsevier, vol. 128(C), pages 509-518.
  • Handle: RePEc:eee:energy:v:128:y:2017:i:c:p:509-518
    DOI: 10.1016/j.energy.2017.04.083
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    References listed on IDEAS

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    1. Fatehi, Hesameddin & Bai, Xue-Song, 2017. "Structural evolution of biomass char and its effect on the gasification rate," Applied Energy, Elsevier, vol. 185(P2), pages 998-1006.
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    1. Tian, Hong & Hu, Qingsong & Wang, Jiawei & Chen, Donglin & Yang, Yang & Bridgwater, Anthony V., 2021. "Kinetic study on the CO2 gasification of biochar derived from Miscanthus at different processing conditions," Energy, Elsevier, vol. 217(C).
    2. Huang, Y.W. & Chen, M.Q. & Li, Q.H. & Xing, W., 2018. "Hydrogen-rich syngas produced from co-gasification of wet sewage sludge and torrefied biomass in self-generated steam agent," Energy, Elsevier, vol. 161(C), pages 202-213.
    3. Wang, Chao & Zhu, Lianfeng & Zhang, Mengjuan & Han, Zhennan & Jia, Xin & Bai, Dingrong & Duo, Wenli & Bi, Xiaotao & Abudula, Abuliti & Guan, Guoqing & Xu, Guangwen, 2022. "A two-stage circulated fluidized bed process to minimize tar generation of biomass gasification for fuel gas production," Applied Energy, Elsevier, vol. 323(C).
    4. Diedhiou, Ansoumane & Ndiaye, Lat-Grand & Bensakhria, Ammar & Sock, Oumar, 2019. "Thermochemical conversion of cashew nut shells, palm nut shells and peanut shells char with CO2 and/or steam to aliment a clay brick firing unit," Renewable Energy, Elsevier, vol. 142(C), pages 581-590.
    5. Zaini, Ilman Nuran & Gomez-Rueda, Yamid & García López, Cristina & Ratnasari, Devy Kartika & Helsen, Lieve & Pretz, Thomas & Jönsson, Pär Göran & Yang, Weihong, 2020. "Production of H2-rich syngas from excavated landfill waste through steam co-gasification with biochar," Energy, Elsevier, vol. 207(C).

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