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

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

Renewable Energy, 2023, vol. 208, issue C, 618-626

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.

Keywords: Active alkali and alkaline earth metals; Volatiles-char interaction; Physical and chemical structures; Coal; Corn stover (search for similar items in EconPapers)
Date: 2023
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Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:208:y:2023:i:c:p:618-626

DOI: 10.1016/j.renene.2023.03.091

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