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Two points have been investigated in this project about the wiping task during the hot dip galvanisation process. Firstly, the study of a casing surrounding the wiping nozzles in order to reduce the noise emission has been carried out in lab conditions, in pilot line conditions and in industrial conditions. This study includes a task dedicated to the noise characterisation around the wiping devices (pilot and industrial) and a second task during which the efficiency of some casing designs has been measured. The tests at the lab and the pilot scales show the capacity of a casing to ensure a relevant noise reduction: 9-15dB. Nevertheless, the industrial tests are not so evident due to the difficulties to match the casing design necessities and the existing wiping conditions (hardware design and hot dip process constraints). This fact did not allow installing the �ideal� casing design and the noise reduction observed has not been significant. Secondly, the investigation of some wiping parameters to ensure an efficiency improvement has been carried out. Two tools are used: the pilot line wiping device and the computer fluid dynamic analysis. The main observations are as follows. - A closer wiping of the strip should lead to a more efficient wiping, even if there is a limit to the improvement given by the change of wiping regimes for very close wiping (Z/d <8); such a limit was investigated with further modelling activity also dealing with heat transfer between gas and strip. - Wiping with hot gas does not provide the expected improvement and it is a tricky problem to study because of the mix of the thermal effect, geometrical effect and dynamic effect. - In any case, the process parameters leading to a more efficient wiping are also related to significant noise, therefore casing strategies should prevail. - For this point, the collaboration of the air knife suppliers in the casing design would be a key factor for success in relevant noise reduction in the pot environme

Additional information

Authors: WINAND S, European Commission, DG Research, Brussels (BE);LOBATO RUBIO V, European Commission, DG Research, Brussels (BE);DE SANTIS M, European Commission, DG Research, Brussels (BE)
Bibliographic Reference: EUR 22377 EN (2007), 116 pp. Euro: 25
Availability: Katalogue Number: KI-NA-22377-EN-S The paper version can be ordered online:
ISBN: ISBN: 92-79-02650-X
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