Community Research and Development Information Service - CORDIS


This project reached the following conclusions:

- The internal state of annealing will be better assessed through new measuring techniques; more accurate temperature measurements, local gas analysis especially in the vicinity of the strip, and gas tracing to evaluate gas exchanges between the various furnace sections.
- Mathematical models and computation methods have been developed (coupled fluid dynamics and heat transfer or residence time distribution models); they lead to a better description and quantification of the flow and temperature patterns within industrial furnaces.
- New gas locks have been developed (using gas knife injectors) to isolate sections of the annealing line for making local thermochemical treatments; they may also be applied to existing annealing furnaces.

As a consequence of this research programme, the following achievements have been made:

- Furnace mass balances have shown that their gas consumption could be decreased especially through the proper control of their sealing devices and purges.
- Gas tracings have also revealed that even small pressure gradients within furnaces (from blowers) may lead to large gas flows between sections with important consequences on heat and mass transfer and on furnace efficiency.
- CFD models have helped us to design more favourable furnace geometry for heat exchange (position of gas injectors, product stacking in the furnace) and consequently for productivity and product homogeneity.

This new approach, in terms of chemical engineering, opens the way to a better thermal and chemical control of each of its zones to carry out new surface or bulk treatments.

Additional information

Authors: NICOLLE R, IRSID, Maizières-lès-Metz (FR);MARX K, BFI, Düsseldorf (DE);KLINKENBERG P, CRM, Liège (BE)
Bibliographic Reference: EUR 20207 EN (2002), pp.138. Euro: 20.50
Availability: EUR-OP reference: KI-NA-20207-EN-S Available from EUR-OP sales agents. URL:
ISBN: ISBN: 92-894-6729-3
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