The effects of Na2O/K2O flux on ash fusion characteristics for high silicon-aluminum coal in entrained-flow bed gasification

Fenghai Li, Ziqiang Yang, Yang Li, Guopeng Han, Hongli Fan, Xuefei Liu, Meiling Xu, Mingxi Guo and Yitian Fang

Energy, 2023, vol. 282, issue C

Abstract: Composite additives are widely used to regulate coal ash fusion characteristics to meet the requirement of entrained-flow bed gasification. In this paper, the effects and corresponding mechanisms of the Na2O/K2O ratio on ash fusion behavior of high silicon-aluminum coal (Jincheng coal, JC) were investigated. The results showed that at the same total mass fractions of Na2O and K2O (15%), the JC ash fusion temperatures (AFTs) decreased quickly and then increased slowly with increasing Na2O/K2O ratio, the lowest AFT reached when Na2O/K2O ratio was at 9/6. The variations in volume and morphology of mixed JC ashes during heating indicated the AFT variation. The mineral change from KAlSi2O6 (MP: 1686 °C) to NaAlSiO4 (MP: 1100 °C) with increasing Na2O/K2O mass ratio mainly resulted in a decrease in the AFT. This indicated that the Na2O/K2O synergy flux effect was related to the formation of a NaAlSiO4–KAlSiO4 eutectic structure. The AFT variation with increasing Na2O/K2O ratio was also explained by the fact that a quick increase and then a slow decrease in the temperature at which all solid phase changes into liquid-phase was calculated by FactSage.

Keywords: High silicon-aluminum coal; Ash fusion characteristics; Na2O/K2O ratio; Synergy flux effect (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0360544223019977
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:282:y:2023:i:c:s0360544223019977

DOI: 10.1016/j.energy.2023.128603

Access Statistics for this article

Energy is currently edited by Henrik Lund and Mark J. Kaiser

More articles in Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().