Ⅰ 引言 要控制高炉炉料(矿石和焦碳)的分布,测定炉料的厚度及下降速度是十分重要。到目前为止,开发了两种测定方法,一种是间接法,另一种是直接法。间接法采用激光、微波或机械测探计测定炉料的表面分布情况;直接法是通过测定矿石和焦碳在炉料中的导电性或导磁率来测定。然而,前者由于装料表面的流态化而产生误差;后者由于高温(接近居里点)及粉尘粘附于传感器上的影响而降低可靠性耐用性。因此,日本钢 I. INTRODUCTION To control the distribution of blast furnace charge (ore and coke), it is important to measure the thickness and rate of fall of the charge. To date, two assays have been developed, one indirect and the other direct. The indirect method uses laser, microwave or mechanical goniometer to determine the surface distribution of charge. The direct method is to determine the conductivity or permeability of ore and coke in charge. However, the former produces errors due to fluidization of the charging surface; the latter decreases reliability and durability due to the effects of high temperature (near Curie point) and dust adhesion on the sensor. Therefore, Japanese steel