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A technique was developed to measure the forces acting when the coke is being pushed. It is based on measurement by means of resistance strain gauges of the torsion torque on the driving shaft of the pushing ram motor and on measurement of the electrical power input of the motor. The values were obtained automatically and transmitted by radio link to a computer for interpretation. The causes of the increased forces of pressure occurring were then systematically investigated. Essential factors are the degree of softening during heating, the duration of heating, the final temperature of the coke, the shrinkage of the coke mass and the moisture content of the coal used. Swelling pressure appears to have little effect on the force if the coal used is not too extreme. To determine to what extent possible distortion of the oven walls might affect passage through the oven, a measuring system based on laser triangulation sensors was developed and incorporated within a pusher.

Additional information

Authors: BERGBAU-FORSCHUNG GMBH, Bergbau-Forschung GmbH, (D.M.T.), Bochum (DE)
Bibliographic Reference: EUR 12966 DE (1990) 39 pp., MF, ECU 4, blow-up copy ECU 5
Availability: (2)
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