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Effects of volatiles and active AAEMs interaction with char on char characteristics during co-pyrolysis

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  • Jiao, Zixin
  • Qiu, Penghua
  • Chen, Xiye
  • Liu, Li
  • Zhang, Linyao
  • Xing, Chang

Abstract

The interactions between volatile substances (volatiles and volatile alkali and alkaline earth metals) released from pyrolysis and char have a crucial influence on the co-gasification process. The influence mechanism of volatiles-char interaction and volatile substances-char interaction in the co-pyrolysis of coal (RSM) and corn stover (RCS) was studied. The findings indicated that volatiles-char interaction suppressed the progression of specific surface area (SSA) and pore structures of char. Volatile active alkali and alkaline earth metals (Ac-AAEMs) of RCS/RSM attenuated the unfavorable effects of volatiles and facilitated the progression of pore structures and SSA of coal/RCS char. Besides, volatiles could react with char through small aromatic ring structures and oxygen-containing groups. The presence of volatile Ac-AAEMs could inhibit the depletion of small aromatic ring structures and oxygen-containing groups caused by volatiles-char interaction. Among them, RCS volatile Ac-AAEMs suppressed the consumption of 11% oxygen-containing groups. RSM volatile Ac-AAEMs inhibited the depletion of 4% oxygen-containing groups. Finally, RCS volatiles-char interaction could inhibit the reactivity of RSM char. The existence of RCS volatile Ac-AAEMs could alleviate the inhibition of volatiles and significantly promote the reactivity of RSM char. Nevertheless, the volatiles and volatile Ac-AAEMs from RSM exhibited minor impacts on RCS char reactivity.

Suggested Citation

  • Jiao, Zixin & Qiu, Penghua & Chen, Xiye & Liu, Li & Zhang, Linyao & Xing, Chang, 2023. "Effects of volatiles and active AAEMs interaction with char on char characteristics during co-pyrolysis," Renewable Energy, Elsevier, vol. 208(C), pages 618-626.
    • Handle: RePEc:eee:renene:v:208:y:2023:i:c:p:618-626
    DOI: 10.1016/j.renene.2023.03.091
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