冲天炉一般在起炉初期,由于炉温偏低,很容易造成前炉出铁口冻结或堵塞。当出现这种故障时,只好用手工打通或用氧焊吹通,不仅增加了劳动强度,而且易造成经济损失。我厂有熔化率3t/h和4t/h冷风冲天炉各一座,三班作业,日产铁水量30t左右,其中90％为球墨铸铁。1986年以前冲天炉出铁口冻结也时有发生,给生产造成损失。为此,我们在前炉 Cupola generally in the early stages of the furnace, due to the low temperature, it is likely to cause the front tapping hole frozen or blocked. When this kind of breakdown occurs, it has to be opened by hand or blown through by oxygen welding, which not only increases the labor intensity but also easily causes economic losses. I plant a melting rate 3t / h and 4t / h cold wind cupola each one, three shifts, Nissan iron content of about 30t, 90% of which is ductile iron. Before 1986 the cupola taphole freezing also occurred from time to time, to produce loss. To this end, we are in the forehearth