PURPOSE: To enable sure discrimination of whether the high luminous particle in the visual field of an observing device is ore or coke in the stage of observing the inside in the shaft part of a blast furnace during the operation of said furnace by measuring the change time of luminance when said particle is cooled by an inert gas.
CONSTITUTION: A sonde 5 which has an optical system to permit observation of the inside of a blast furnace 1 and can release gaseous N2 from the tip thereof is inserted into the so-called lump zone 4 from the mid-stage in the shaft part 2 of said furnace down to a level 3 where ore melts. The temp. in this part is high and both coke and ore emit light spontaneously in an incandscent state and are therefore not discriminatable. A cold inert gas such as N2 is ejected from the tip of the sonde 5 in this stage and is applied to the raw material particle which emits spontaneously in the incandescent state, thereby cooling said particle. The degree of a decrease in luminance owing to such cooling is measured with time. The coke has smaller specific heat than the ore and the luminance thereof decreases more quickly than the ore by the cooling with the inert gas and therefore the ore and the coke are exactly discriminated from the difference in said time and the distributing condition of the raw material in the blast furnace is detected.
TSUDA AKIHIRO
SHIRAKAWA YOSHIYUKI
NAKAGOME RINJI
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