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The classical descaling process operates at very high pressure (150 bars) and involves large quantities of water. In addition to the high energy consumption, that brings a significant temperature drop of the product. In this context, the development of a new descaling process using less energy and having a smaller cooling effect is very interesting, economically and technically. The basic idea of the new process is to replace the flat jet nozzles classically used by nozzles with cylindrical coherent jet of small diameter providing a high density of energy. Several nozzles are installed side by side and oscillate in order to cover the full width of the product; the thermal shock created by the high energy impact breaks the scale and the short contact time limits the temperature drop of the product. In a first stage, a laboratory equipment has been built and promising results have been achieved: a good descaling has been obtained with water flow and pressure reduced by half with respect to the classical process. In parallel with the laboratory studies, the new process has been tested industrially.

Additional information

Authors: WILMOTTE S, CRM, Liège (BE);SIMON P, CRM, Liège (BE)
Bibliographic Reference: EUR 18388 FR (1998) 52pp., ECU 10.00
Availability: Available from the (2)
ISBN: ISBN 92-827-8533-5
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