Durability and corrosion behavior of refractory lining, a core part of a commercial water‐coal slurry gasifier, largely determine its gas yield rate and carbon conversion rate. In this work, corrosion behavior of high chromite‐containing refractory served for 4200 hours in a water‐coal slurry gasifier was studied, and the role of generated stress cracks on its degradation behavior was elucidated. The results demonstrated that the depth of penetration under the assistance of the cracks was up to 2.60 cm, which was much deeper than that in the case free from stress crack. The sub‐surface, accompanied by cracking, provided a pathway for slag penetration and resulted in more severe corrosion. Furthermore, the isolation layer of (Cr, Fe, Al)₂O₃ solid solution on the refractory’ surface trapped most of the iron oxides. As a result, a further attack from other main corrosive species was controlled by their diffusion through it.

中文翻译：

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水煤浆气化炉中Cr2O3-Al2O3-ZrO2耐火材料的降解机理：应力裂纹的作用

耐火炉衬是商用水煤浆气化炉的核心部分，其耐久性和腐蚀性能在很大程度上决定了其气体产率和碳转化率。在这项工作中，研究了在水煤浆气化炉中使用4200小时的含高铬铁矿质耐火材料的腐蚀行为，并阐明了产生的应力裂纹对其降解行为的作用。结果表明，在裂纹的辅助下，穿透深度可达2.60 cm，比没有应力裂纹的情况下的穿透深度要深得多。伴随裂纹的地下表面为熔渣渗透提供了途径，并导致了更严重的腐蚀。此外，（Cr，Fe，Al）₂ O ₃的隔离层耐火材料表面上的固溶体捕获了大部分氧化铁。结果，其他主要腐蚀物质的进一步扩散受到其扩散的控制。