高炉炉衬侵蚀微观机理

Microscopic mechanism of lining erosion in a blast furnace

摘要: 对高炉上部中、低温区和下部高温区取砖样,应用热力学计算、扫描电镜和能谱分析等方法,从热力学和微观机理两方面研究了高炉衬砖侵蚀机理.结果表明:K对碳砖的侵蚀具有穿透力,Na则没有;K是通过K蒸气穿透到砖中,而Na是通过气体带着Na的化合物渗透到砖缝中.在高温区Zn对砖的侵蚀作用很小,中、低温区Zn对砖的侵蚀影响最大.

Abstract: With samples acquired from different temperature zones in a blast furnace (BF),the erosion mechanism of linings was investigated in thermodynamics and micro-mechanism by thermodynamic calculations,SEM and EDS.The results indicate that bricks are penetrable for the steam of K,but Na penetrates in bricks by airflow mixed with Na compounds.Zn has a larger effect on lining erosion in middle and low temperature zones but much less in a high temperature zone.