徐州锻压设备制造厂铸造车间,有5t/h、3t/h 倒大双冷风冲天炉各一座,铁水出炉温度长期稳定在1400～1430℃。该厂原按常规工艺修砌前炉,即前炉底向出铁口方向倾斜5°,前炉内壁修砌成圆筒形。这样修砌的前炉多年使用表明,在送风初期首次出铁水时,出铁口经常被冻结;熔化后期,过桥下端的前炉内壁又常发生漏铁水故障。为解决这两个问题,该厂采用如下修砌前炉工艺,收效明显。(1)把前炉底砌成向前炉工作门方向倾斜5°(图左),使最初熔化的低温铁水全部流向前 Casting plant in Xuzhou Forging Equipment Factory, a 5t / h, 3t / h inverted large double-cupola each one, the temperature of hot metal baked long-term stability at 1400 ~ 1430 ℃. The original factory according to the conventional process repair before the furnace, that is, the front of the furnace to the taphole inclined 5 °, the former furnace repair built into a cylindrical wall. The use of such furnaces for many years showed that the taphole was often frozen when the hot metal was first tapped in the early stage of air supply. In the late stage of melting, the molten iron failure often occurred on the inner wall of the front furnace at the lower end of the bridge. In order to solve these two problems, the factory adopts the following methods to repair the pre-furnace furnace and has obvious effects. (1) Make the front furnace bottom tilted by 5 ° to the front of the working door of the furnace (left), so that all the molten low-temperature molten iron flows to the front