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A process has been developed to determine the settled apparent density distribution in a 7m coke oven. This process is capable of carrying out measurements under the extreme conditions of a coking plant and with the required accuracy. A modified radiometric density-moisture probe is used for measuring, based on the backscatter principle. A Cs-137 gamma-emitter (10 mCi) and an Am-241/Be neutron emitter (100 mCi) are used as radiation sources. The exact positioning of the probe in the charge is effected by special filling-hole covers, made to very precise measurements using a laser process, which are bolted onto the filling-hole frame. The special requirements for handling radioactive material considerably delayed the commencement of the measuring process. During the first measurements a great variation in settled apparent density was found across the height. Also, the density in the area below the filling holes was considerably greater than the average density in the oven. This is partly due to the concentration of water in the centre of the charge.

Additional information

Authors: EISENHUT W, Bergbau-Forschung GmbH, Essen (DE);HUHN F, Bergbau-Forschung GmbH, Essen (DE);STRELOW F, Bergbau-Forschung GmbH, Essen (DE);LORENZ H, Differten/Saarland (DE)
Bibliographic Reference: EUR 11729 DE (1988) MF, Vol. 1, 21 pp., ECU 4, blow-up copy ECU 5 EUR 11729 DE (1988) MF, Vol. 2, 156 pp., ECU 8, blow-up copy ECU 20
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