It is feasible to use oxygen injecting into hearth of cupola and cupola with basic lining in some location.
应用冲天炉炉缸喷氧技术和局部碱性冲天炉是可行的；
2
The liningless cupola is featured by that the furnace shaft, except the hearth section, is not lined but substituted by a heat-exchanging jacket (HEJ)which is made of heat-resistant metal.