气化炉用后高铬砖的渣蚀机理

采用扫描电镜和XRD等分析方法,对石油焦气化炉和水煤浆气化炉用后高铬砖及渣蚀试验砖的显微结构进行了观察与分析。根据高铬砖显微结构变化,研究了在不同气化炉内高铬砖受熔渣侵蚀损毁的机理。结果表明:石油焦气化炉用高铬砖中的Cr2O3与熔渣中的V2O5接触反应,在低温下形成液相而被熔蚀,是其蚀损的主要原因;水煤浆气化炉用高铬砖蚀损的主要原因是Cr2O3在熔渣里的溶解和ZrO2的熔蚀;LIRR-HK95砖由于成分和结构的优化,抗石油焦渣侵蚀性能好。

Slag corrosion mechanism of high chrome bricks used for gasifier

Research was focused on slag corrosion mechanism of high chrome bricks used for different types of gasifier by comparing the structure of high chrome bricks for petroleum coke gasifier and water-coal slurry gasifier with slag corroded testing brick and water coal slurry gasifier through Scanning Electron Microscope(SEM) examination and X-ray diffraction.Results show that for high chrome bricks used for petroleum coke gasifier,corrosion is mainly caused by the reaction between Cr_2O_3 in the brick and V_2O_5 in molten slag and therefore forming liquid phase at low temperature;for high chrome bricks used for water-coal slurry gasifier,corrosion is caused by dissolution of Cr_2O_3 in molten slag and corrosion of ZrO_2.For LIRR-HK95 brick,it performs better corrosion resistance to petroleum coke than the others due to its optimized composition and structure.