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Some new insights into the kinetic compensation effect in different diffusion-controlled domain for char-CO2 gasification

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  • Sun, Kaiwei
  • Cui, Meiqin
  • Zhang, Bo
  • Li, Yongjun
  • Geng, Ping
  • Fu, Peng
  • Yi, Weiming
  • Zhang, Yan

Abstract

The CO2 gasification reaction of lignite and coffee char are conducted at 1098–1173 K and 0.025–0.1 MPa CO2 via thermogravimetry analysis (TGA). The calculation methods of the activation energy and pre-exponential factor are further compared and analyzed. The activation energy and pre-exponential factor in the chemical-controlled domain, the external diffusion-controlled domain and the bed diffusion-controlled domain are measured to investigate the relationship between the kinetic compensation effect and mass transfer limitations. Results reveal that the normalized power-law rate equation can provide reliable kinetic parameters due to PCO2n ≠ constant (PCO2n represents the partial pressure term) at different temperatures and f(X) ≠ constant (f(X) represents the mechanism function term) at different char conversion. In the chemical-controlled or the external diffusion-controlled domains, coffee grounds char (CGC) and lignite char (LC) exhibit similar activation energies and pre-exponential factors in the char conversion range of 0.2–0.8. In the bed diffusion-controlled domain, the activation energy and pre-exponential factor increase and then decrease during the reaction process. An evident kinetic compensation effect was observed between E and ln(A0) throughout the conversion process with bed diffusion and among data from experiments with and without diffusional limitations, showing its dependence on mass transfer limitations.

Suggested Citation

  • Sun, Kaiwei & Cui, Meiqin & Zhang, Bo & Li, Yongjun & Geng, Ping & Fu, Peng & Yi, Weiming & Zhang, Yan, 2023. "Some new insights into the kinetic compensation effect in different diffusion-controlled domain for char-CO2 gasification," Renewable Energy, Elsevier, vol. 217(C).
    • Handle: RePEc:eee:renene:v:217:y:2023:i:c:s0960148123012703
    DOI: 10.1016/j.renene.2023.119355
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    References listed on IDEAS

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    1. Zhang, Zhiqing & Duan, Hanqi & Zhang, Youjun & Guo, Xiaojuan & Yu, Xi & Zhang, Xingguang & Rahman, Md. Maksudur & Cai, Junmeng, 2020. "Investigation of kinetic compensation effect in lignocellulosic biomass torrefaction: Kinetic and thermodynamic analyses," Energy, Elsevier, vol. 207(C).
    2. Kirtania, Kawnish & Axelsson, Joel & Matsakas, Leonidas & Christakopoulos, Paul & Umeki, Kentaro & Furusjö, Erik, 2017. "Kinetic study of catalytic gasification of wood char impregnated with different alkali salts," Energy, Elsevier, vol. 118(C), pages 1055-1065.
    3. Chen, Liangzhou & Qi, Xuyao & Zhang, Yabo & Rao, Yuxuan & Wang, Tao, 2022. "Gasification characteristics and thermodynamic analysis of ultra-lean oxygen oxidized lignite residues," Energy, Elsevier, vol. 240(C).
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