从组成和气氛对熔渣的影响角度出发,结合相图分析了不同气氛条件下Cr2O3在煤渣中的熔蚀行为,主要包括Cr2O3的溶解以及化学反应形成的铬酸盐的溶解.空气气氛下,铁的Fe3+存在形式使得熔渣的黏度较高,高铬材料表面形成的(Al,Cr,Fe)2O3亦会阻碍Cr3+的扩散,从而延缓了Cr2O3的熔蚀;在水煤浆气化炉的还原工况条件下,Fe2的富集会显著降低尖晶石的熔融温度,增加Cr2O3的熔蚀;而在更低氧分压条件下,Cr2O3的变价熔蚀更明显.水煤浆气化炉条件下,是否形成Cr2+并参与Cr2O3的熔蚀过程,仍有待探讨.
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