C - Chemistry – Metallurgy – 21 – C
Patent
C - Chemistry, Metallurgy
21
C
C21C 5/56 (2006.01) C21C 5/52 (2006.01) F27D 13/00 (2006.01) F27D 17/00 (2006.01)
Patent
CA 2575196
The invention relates to the production of secondary steel based on scrap. According to the invention, the scrap (10) is fed into a scrap preheater (2) via a charging device (1), is preheated therein, is then transferred into a melting unit (3), and is fused exclusively with the aid of primary energy. The invention is characterized in that the process gases (19) that are discharged from the melting unit (3) are used indirectly by heating a gaseous preheating medium, e.g. air (18) or inert gas, rather than being used for directly preheating the scrap (10), thus making it possible to energetically, fluidically, and spatially disconnect the preheating and melting process as well as the post-combustion and preheating process.
L'invention concerne la fabrication d'acier secondaire à base de ferrailles, consistant à introduire les ferrailles (10) dans un préchauffeur de ferrailles (2) par l'intermédiaire d'un dispositif de chargement (1), à préchauffer les ferrailles, à introduire les ferrailles dans un groupe de fusion (3), puis à fondre les ferrailles au moyen d'énergie primaire exclusivement. Selon l'invention, les gaz de processus (19) quittant le groupe de fusion (3) ne sont pas employés pour le préchauffage direct des ferrailles (10), mais employés indirectement par chauffage d'un fluide de préchauffage gazeux, par exemple d'air (18) ou de gaz inerte. On obtient ainsi un découplage énergétique, fluidique et spatial entre préchauffage et fusion, et entre postcombustion et préchauffage.
Marks & Clerk
Sms Demag Ag
Sms Siemag Aktiengesellschaft
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