水煤浆气化炉内衬材料的无铬化势在必行.基于碳氮化钛对高炉渣的增稠机理,本工作在前期开发水煤浆气化炉用Al2O3-C无铬化内衬材料的基础上,拟通过在Al2O3-C材料中引入一定量的TiO2,使之在高温下材料内原位反应形成碳氮化钛相,提高材料的抗气化炉渣侵蚀性能.结果表明:当Al2O3-C材料引入适量的TiO2时,可以发现在烧成过程中材料中原位形成了Ti(C,N)相,优化材料的孔结构;当材料与渣发生反应时,提高了在侵蚀过程中渣的粘度,改善材料的抗侵蚀性能.当材料中引入的过量的TiO2,TiO2易与气化炉渣发生反应,降低渣的粘度,从而降低材料的抗侵蚀性能.
Chromia-free lining materials for gasifier have to be developed with due consideration to environmental requirements.Based on the theory that viscosity of Ti(C,N) containing slags are higher than others.In order to introduce in-situ formed Ti(C,N) and improve the corrosion resistance of refractories.TiO2 is added into novel Al2O3-C materials for gasifier lining, which has been reported in our previous work.The results show that pore structure of Al2O3-C materials is optimized when appropriate TiO2 is added, due to the in-situ formation of Ti(C,N).Moreover, slag viscosity will be increased when slag react with Ti(C,N) containing Al2O3-C materials, so corrosion resistance of this kind of materials is improved.If excessive TiO2 is added into Al2O3-C materials, TiO2 will dissolve into slag at high temperature and result in decreasing of slag viscosity.Corrosion resistance of Al2O3-C materials decreases.
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