摘要
方大特钢4号高炉因炉缸异常开裂被迫停炉,通过调查分析,其最主要原因是Zn对高炉内衬的严重侵蚀破坏作用,其次是碱金属Na的侵蚀和炭砖质量问题,Pb的渗入及渣口一侧冷却壁受损漏水是炉壳开裂过大的原因。此事故的深刻教训:高炉炉缸应采用材质为Q235B、厚度为50mm及以上钢板;新设计高炉取消渣口,炉底设置排Pb口;高炉开炉后应有一定护炉期,形成炉缸保护层;控制原燃料有害元素负荷,做好排Zn、Na、Pb研究工作;高炉炉缸多次开裂时,应有准备并及早彻底处理;采取炉顶加入钛矿结合风口喂线对高炉进行连续针对性护炉,延长高炉寿命。
No. 4 blast furnace was forced to stop working due the abnormal cracking of hearht. Through investigation and anal- ysis, the main reasons are the Zn badly erosion damage on furnace lining, and followed by alkali metal Na erosion and the poor carbon brick quality, Pb penetration and the water leakage of slag outlet side. The lessons for this accident ： blast furnace hearth shall adopt the material of steel plate grade Q235 B with thickness of 50mm and above ; cancelling slag hole in the design of the new blast furnace, opening a hole for discharging Pb in the bottom; protecting furnace after certain period to forming a hearth protection layer; control harmful elements in the raw material, and if multiple cracking in blast furnace hearth occurs and it should be prepared in time, and treated thorough as soon as possible. Taking the method of top adding titanium combined feeding line protects blast furnace and prolong the service life of blast furnace.
出处
《江西冶金》
2012年第3期10-14,共5页
Jiangxi Metallurgy
关键词
高炉
炉缸
异常开裂
调查
教训
blast furnace
hearth
abnormal cracking
investigation
lessons
