PURPOSE: To exactly detect the behavior of the charge in a furnace and particularly the avalanche condition of the surface layer part by determining the apparent descending speed and actual descending speed of the surface layer of the charge in the furnace by using a weight hanging type wire.
CONSTITUTION: A lance 9 is inserted into the furnace and the wire 6 having a weight 7 at the top end is hung from the lance 9 and is seated on a raw material layer 4. The weight 7 is allowed to follow up the movement of the raw material layer 4 as it is for the specified time. The weight 7 flows as well when an avalanche arises in the charge. The total extending length of the wire 6 after the specified time is determined and the apparent descending speed A is determined by taking the measurement time into consideration. The determination of the actual descending speed B is executed by first seating the weight 7 on the raw material layer 4, then immediately pulling up the weight 7 and again setting the weight 7 on the raw material layer 4 after the specified time. The descending amt. is determined from the difference in the length of the wire 6 and the actually descending speed B is determined by taking the measurement time into consideration. The avalanche condition of the raw material layer 4 is detected from the A and B determined in such a manner.
ONO REIJI
ISOBE MITSUTOSHI
