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Synergistic effects and kinetics analysis of biochar with semi-coke during CO2 co-gasification

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  • Wang, Qi
  • Wang, Enlu
  • Li, Kai
  • Husnain, Naveed
  • Li, Deli

Abstract

It is well-known that there is an interaction between biomass and coal in co-gasification process. In this paper, gasification of semi-coke (SC) and soybean straw char (SS) and their blends were carried out using non-isothermal thermogravimetric method. Interaction between SS and SC during co-gasification was investigated and synergy factors were calculated at different conversion stage. In order to explore whether the physical and chemical structure features have an effect on interaction, surface area analyzer, XRF and Raman spectrometer were adopted to determine the porous properties, ordering degree and ash composition for blends. The results show that the changes of porous properties and ordering degree for blends follow a linear law. The correlation expressions linking char characteristics to char reactivities indicate that the degree of graphitization is the main reason influencing the gasification reactivity. The interaction exhibits a negative synergetic effect at low conversion stage and a positive synergetic effect at high conversion stage. In addition, there are significant synergistic effects in the co-gasification of 75%SC/25%SS. Similar conclusions about synergetic effect are also observed from the kinetics data calculated by three kinetic models.

Suggested Citation

  • Wang, Qi & Wang, Enlu & Li, Kai & Husnain, Naveed & Li, Deli, 2020. "Synergistic effects and kinetics analysis of biochar with semi-coke during CO2 co-gasification," Energy, Elsevier, vol. 191(C).
    • Handle: RePEc:eee:energy:v:191:y:2020:i:c:s0360544219322236
    DOI: 10.1016/j.energy.2019.116528
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    References listed on IDEAS

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    1. Zhang, Ziyin & Pang, Shusheng & Levi, Tana, 2017. "Influence of AAEM species in coal and biomass on steam co-gasification of chars of blended coal and biomass," Renewable Energy, Elsevier, vol. 101(C), pages 356-363.
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    3. Bouraoui, Zeineb & Jeguirim, Mejdi & Guizani, Chamseddine & Limousy, Lionel & Dupont, Capucine & Gadiou, Roger, 2015. "Thermogravimetric study on the influence of structural, textural and chemical properties of biomass chars on CO2 gasification reactivity," Energy, Elsevier, vol. 88(C), pages 703-710.
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    2. Zhou, Tianhong & Ge, Lichao & Li, Qian & Yang, Long & Mai, Longhui & Huang, Jing & Wang, Yang & Xu, Chang, 2023. "Combustion and gasification properties of petroleum coke and its pyrolytic semi-coke," Energy, Elsevier, vol. 266(C).
    3. Diao, Rui & Li, Shanshan & Deng, Jingjing & Zhu, Xifeng, 2021. "Interaction and kinetic analysis of co-gasification of bituminous coal with walnut shell under CO2 atmosphere: Effect of inorganics and carbon structures," Renewable Energy, Elsevier, vol. 173(C), pages 177-187.
    4. Liang, Wang & Jiang, Chunhe & Wang, Guangwei & Ning, Xiaojun & Zhang, Jianliang & Guo, Xingmin & Xu, Runsheng & Wang, Peng & Ye, Lian & Li, Jinhua & Wang, Chuan, 2022. "Research on the co-combustion characteristics and kinetics of agricultural waste hydrochar and anthracite," Renewable Energy, Elsevier, vol. 194(C), pages 1119-1130.

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