Title

Collection Technology for Foundries and Steel Plants

Collection Technology for Foundries and Steel Plants

Authorship

LEHNHÄUSER, FRANK

LEHNHÄUSER, FRANK

I am this author

DOI

10.5151/2594-5327-C01016

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Abstract

It is the purpose of this report to illustrate the present state-of-the-art collection systems based upon extraction hoods and to show new developments by Kessler + Luch GmbH. Our target was to improve the quality of the collection by maintaining the same air volume or vice versa to reduce the necessary air volume while keeping the same air quality level. This is achieved by means of the plate hood, that generates a flow field going further into the room and thus ensures that the collection depth increases if compared with conventional hood types. Besides, Kessler + Luch managed to create a whirl depression, basing on the principle of the hurricanes as they appear in nature. The collection unit basing upon this air flow principle is called whirl hood and is particularly suitable for the collection of pollutant air flows with high velocities, as for example thermal convection flows. Thanks to the thread-like core of the whirl forming in the centre of the whirl hood and showing an even pressure distribution along the whole length, air can be extracted evenly along the major distances. Beside basic information on air flow this report also contains methodologies and calculation methods that make it possible to lay out and realise open-type collection equipment. Because it is difficult to create general rules and/or the real conditions in some case can only be estimated, the laying out of collection equipment requires long practice and in-field experience. The report therefore closes on some practical examples from the metallurgical industry.

It is the purpose of this report to illustrate the present state-of-the-art collection systems based upon extraction hoods and to show new developments by Kessler + Luch GmbH. Our target was to improve the quality of the collection by maintaining the same air volume or vice versa to reduce the necessary air volume while keeping the same air quality level. This is achieved by means of the plate hood, that generates a flow field going further into the room and thus ensures that the collection depth increases if compared with conventional hood types. Besides, Kessler + Luch managed to create a whirl depression, basing on the principle of the hurricanes as they appear in nature. The collection unit basing upon this air flow principle is called whirl hood and is particularly suitable for the collection of pollutant air flows with high velocities, as for example thermal convection flows. Thanks to the thread-like core of the whirl forming in the centre of the whirl hood and showing an even pressure distribution along the whole length, air can be extracted evenly along the major distances. Beside basic information on air flow this report also contains methodologies and calculation methods that make it possible to lay out and realise open-type collection equipment. Because it is difficult to create general rules and/or the real conditions in some case can only be estimated, the laying out of collection equipment requires long practice and in-field experience. The report therefore closes on some practical examples from the metallurgical industry.

Keywords

air flow, extraction hood, pollutant collection, whirl hood, metallurgical industry

air flow, extraction hood, pollutant collection, whirl hood, metallurgical industry