1前言无锡市第三钢铁厂有轧钢加热炉5台，1989年以前，加热炉高温段的炉顶炉墙均采用内层为高铝质耐火砖，外层为轻质粘土砖的砌筑方式，由于炉子的整体性、密封性和保温性差，炉子升温慢、产量低，能耗较高，尤其炉体寿命短，修炉费用及停产损失都较大。1989年开始，该厂的炉? 1 Preface There are 5 rolling mills in Wuxi No.3 Steel Plant. Prior to 1989, the furnace top walls in the high-temperature furnaces were made of high-alumina refractory bricks in the inner layer and light clay bricks in the outer layer , Due to the integrity of the furnace, sealing and insulation is poor, slow furnace temperature, low output, high energy consumption, in particular, short furnace life, repair furnace costs and production losses are larger. Beginning in 1989, the plant’s furnace?