Journals →  Chernye Metally →  2013 →  #9 →  Back

Iron and Steel Making
ArticleName Vacuum pump systems for secondary metallurgical processes
ArticleAuthor F. Dorstewitz, D. Tembergen
ArticleAuthorData

SMS Mevac GmbH (Essen, Germany):

Dorstewitz F., Dr. Eng., Head of Processing Equipment

Tembergen D., Mag. Eng., Head of Metallurgy, E-mail: dieter.tembergen@sms-mevac.com

Abstract

The following article describes the general technical requirementsplaced on vacuum pumps for secondary metallurgical plants.Vacuum treatment of liquid steel takes a prominent position amongthe various secondary metallurgical processes due to its versatile nature,especially in the production of high-quality steel grades. Forgeneration of the required medium vacuum, efficient state-of-the-artsecondary metallurgical plants use pump systems consisting of steamejector pumps or mechanical vacuum pumps for the vacuum treatment of steel. To decide on which of these systems to use, it is necessary to also consider optimization of the overall system including anyauxiliary equipment, in addition to the metallurgical task and the specific operating costs of the operating company. Distribution of vacuumfacilities of VD and RH type worldwide in accordance with heat sizeduring 1990–2010 is shown. Operation of the single-vessel RH plant at ArcelorMittal Eisenhüttenstadt, twin-tank VD facility Shanghai No. 1 are observed in this paper. Typical pressure reduction in a VD facility for degassing and typical pressure reduction for a steel grade to be decarburized in RH facilities are compared. Gas quantities arising for selected standard metallurgical operation (VD, VOD, RH, RH-O) and intake capacities of the steam injection vacuum pump and mechanical vacuum pumps at a pressure of 0.67 mbar are analyzed, including conversion factors for individual gases. Required plant components and auxiliary equipment as a function of the metallurgical process and of the vacuum pump system are presented. Operating and investing costs for using mechanical and steam-ejection vacuum pumps are estimated.

keywords Vacuum pumps, mechanical pumps, steam-ejection pumps, vacuum processing, chamber and circulation vacuum units, technical performance, stainless steel
References

1. Bruce, S.; Cleetham, V.; Legge, G.: stahl u. eisen 130 (2010) Nr. 11, S. 52/58.
2. Bruce, S.; Cleetham, V.; Legge, G.: Reducing energy demand and environmental emissions in secondary steel processing by using modular dry mechanical vacuum pumping systems, Proc. AISTech 2011, Indiana, USA, 2.–5. Mai 2011, S. 1377/87.
3. Bruce, S.; Cleetham, V.; Legge, G.; Villa, A.: Experience with dry vacuum pumping systems as applied to the VOD, VD-OB and RH processes for the production of stainless steel and ULC steels, Proc. 7th European Stainless Steel Conference, Como, Italien, 21.–23. Sept. 2011.

Language of full-text russian
Full content Buy
Back