PURPOSE: To detect exactly the residual thickness of the refractory wall of a converter as well as the transition thereof with time and to discover the abnormal wear of the refractory wall in an early stage by detecting the fluctuation in the temp. during one cycle of the operation including the time while the furnace is empty by the thermocouples embedded in the refractory walls in the stage of operating the converter.
CONSTITUTION: Thermocouples A are embedded into the refractory wall of a converter at 100W150mm space from the inside wall and the temp. during refining when the cycle consisting of raw material charging, refining and tapping is repeated increases as shown in the curve I in the stage of operating the converter. When the inside of the furnace after tapping is empty, the temp. falls like the curve II and the temp. difference ΔT is detected during this time. The temp. is compared with the value ΔT calculated preliminarily from the relation between the heat conductivity of the refractory wall and the distance from the inside surface of the refractory wall to the position A and the distance ΔL from A to the inside surface of the refractory wall is exactly estimated. The danger for the erosion of the furnace wall owing to the abnormal wear of the refractory wall is predicted therefrom and a countermeasure is effected.
MIYASHITA HISASHI
ITOU TAKAHIRO
