天津铁厂4号高炉第二代炉役炉底、炉缸采用的是自焙炭块炉衬,生产了9年多,停炉后发现,自焙炭块炉衬已焙烧成一个近于无缝的整体,没有“环状断裂”缝存在,除铁口区外,“蒜头状”异常侵蚀不明显。因此,第三代炉衬的炉底仍保留上代的五层自焙炭块,并对炉底炉缸结构作了改进,即采用了“半石墨化低气孔率自焙炭块—陶瓷砌体复合炉衬”技术。 Tianjin Iron Works No. 4 blast furnace furnace bottom of the second generation, the hearth is self-baking carbon block lining, produced more than 9 years, shutdown found that self-baking carbon block lining has been roasted into a nearly seamless Overall, there is no “ring fracture” seam exists, except for the iron mouth area, “garlic-like” abnormal erosion is not obvious. Therefore, the third generation of the lining of the furnace still retains the previous generation of five self-baking carbon block, and the hearth furnace structure has been improved, that is, the use of “semi-graphitized low porosity self-baking carbon block - ceramic masonry composite Lining ”technology.