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The objectives of this study were to measure burden size, descent rate and layer thickness within the blast furnace using radiation techniques. Microwaves were initially considered as a means of determining these parameters and laboratory experiments were carried out. These tests proved that significant differences in the absorption/reflection characteristics of ferrous and coke existed, which enabled the identification of material type. Burden layer thickness could therefore be determined. Two detectors enabled burden descent rate to be calculated, resulting in accurate determination of material size. These successful tests resulted in a blast furnace probe being designed and built to survive the harsh conditions prevalent in the furnace. However the stockline was lowered for operational reasons and consequently the probe did not remain buried at all times, resulting in probe results of limited value. Due to these problems the use of infrared was investigated. Laboratory experiments confirmed that infrared could be used to measure burden descent rate and material size and the probe was modified to take both infrared and microwave systems. Results proved successful and burden size was determined. Work continues to improve the purging system. This will increase the signal to noise ratio, simplifying signal analysis.

Additional information

Authors: SEXTON M, British Steel, Teesside Technology Centre, Middlesbrough (GB)
Bibliographic Reference: EUR 15709 EN (1996) 113pp., FS, ECU 13.50
Availability: Available from the (2)
ISBN: ISBN 92-827-6463-X
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