High-temperature corrosion behavior of high chromia refractory by alkali metal sodium with different presence states under gasification conditions

Jinghong Gao, Weiguang Su, Jiayi Hou, Xudong Song, Jiaofei Wang, Peng Lv, Guangyu Xu and Guangsuo Yu

Energy, 2024, vol. 309, issue C

Abstract: The high-alkali Zhundong coal (ZDC) was considered to be the most promising and ideal feedstock for gasification. However, excessive sodium content could cause serious corrosion problems and restrict the development and utilization of ZDC. In this work, the corrosion behaviors of refractory lining by alkali metal sodium with different presence states were systematically investigated. The results indicated that sodium vapor diffused into refractory and dissociated Cr2O3 aggregate into small pieces, thereby inducing severe volume expansion and structural loosening. Sodium-rich slag has reacted with the refractory to form low-melting-point phases such as Na2CrO4, NaAlSiO4 and NaAlSi3O8, which reduced the penetration corrosion resistance of the refractory. In addition, the formation of dense Fe-Al/Cr spinel layer at slag/refractory interface also exacerbated spalling to some extent. The two actions of liquid-phase slag and alkali vapor corrosion synergized with each other and together led to refractory failure. This work provided theoretical guidance for qualitatively evaluating the corrosion behavior of alkali metal sodium and large-scale utilization of ZDC.

Keywords: Gasification; High chromia refractory; Sodium-rich slag; Sodium vapor; Corrosion behavior; LIBS technology (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:309:y:2024:i:c:s0360544224028688

DOI: 10.1016/j.energy.2024.133093

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