PURPOSE:To measure the descendent speed of a charge of raw material continuously by installing two detectors in the charge raw material, and calculating the descendent speed from the time of raw material passing and installation distance between both detectors which are obtained from the correlation between pressure drops or raw material properties obtained from those detectors. CONSTITUTION:Reducing gas passes through the raw material in a furnace 10, so its pressure drop depends upon the shape of the raw material which passes by detection ends of pressure drop detectors 12A and 12B. For the purpose, the upper detector 12A obtains the variation state of the pressure drop and then the lower detector 12B obtains the state of the pressure drop after the raw material 11 falls. Their outputs are converted into electric signals by pressure drop signal transmitters 13A and 13B corresponding to the detectors 12A and 12B to obtain output waveforms A and B, which are inputted as output signals to a correlation function part 14 to calculate a correlation function in sequence and obtain the time difference between both signals. Then, the time difference signal between both signals is supplied to an arithmetic processing part 15, which calculates the descendent speed of the charge of raw material.
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