高炉炉底部温度分布の電導紙による相似実験とその応用

Abstract

The temperature distribution in the blast furnace bottom which is constructed by bricks of different materials has been studied by the electric conducting sheet analogy.The electric resistance of the parts of the electric conducting sheet is so adjusted by spraying a dilute solu tion of silver paint, that the electric resistance inversely proportions to the thermal conductivity of the fur nace bottom brick.The temperature distributions in the blast furnace bottom are estimated by the equi-electric-potential curves on the electric conducting sheet. These electric conducting sheet analogy experiments are performed for different eroded depths of the hearth bottom. The temperature in the hearth bottom of an operating furnace is measured by a few thermocouples located there. The eroded depth is assumed 1050 mm by the electric conducting sheet analogy with these measured temperatures in the hearth bottom.On the other hand, the actual eroded depth of the hearth in the reconstruction of the furnace is found to be 1 100 mm. By this result, the electric conducting sheet analogy experiment is useful for estimating the eroded depth of the hearth bottom when the erosion goes along the equi-temperature curves of the hearth bottom.This experiment is applied to other blast furnaces, and it is found that the eroded depth is proportional to the integrated pig iron production per unit hearth area.