不同种类煤渣与高铬材料的反应

Reactions between different coal slags and high chrome materials

对国内多家水煤浆气化炉用后煤渣的化学分析结果表明,它们是以SiO2为主成分的酸性煤渣;根据煤渣中CaO和FeOn含量的不同,可将这些煤渣分为高硅渣、高钙渣和高铁渣三类。对三类煤渣熔融特性温度(包括软化温度、半球温度和流动温度)的测试结果表明,高硅渣的熔融特性温度最高,其次是高铁渣,高钙渣的最低。以这三类煤渣对高铬砖进行的抗渣侵蚀试验(坩埚法)表明:高钙渣的渗透深度最深,其次为高铁渣,而高硅渣渗透的深度最浅;高钙渣侵蚀后,试样基质结构被破坏,颗粒呈孤立分布;高铁渣侵蚀后,在表面形成了一层致密层;高硅渣侵蚀后,试样的连续结构也遭到一定程度的破坏。

Chemical analysis of coal slags from several coal water slurry gasifiers in China showed that they were acid slags with SiO2 as the main composition.According to the contents of CaO and FeOn,the slags were classified into high silica slags,high calcia slags,and high ferric oxides slags.The melting character-istic temperatures （softening temperature,hemispherical temperature,and flow temperature）of the three slags were tested.The results show that the high silica slag has the highest melting characteristic tempera-tures,then the high ferric oxides slag and the high calcia slag follow.The slag corrosion resistance results （crucible method）show that the high calcia slag has the deepest corrosion,then the high ferric oxides slag and the high silica slag follow;after corroded by the high calcia slag,the matrix structure of the speci-men is damaged and the particles distribute isolatedly;after corroded by the high ferric oxides slag,a dense layer is formed on the surface of the specimen;after corroded by the high silica slag,the continuous structure of the specimen is damaged to some extent.