G - Physics – 01 – J
Patent
G - Physics
01
J
G01J 5/04 (2006.01) C21C 5/46 (2006.01) C21C 5/48 (2006.01) G01J 5/02 (2006.01) G01J 5/08 (2006.01) G01J 5/60 (2006.01)
Patent
CA 2510963
The present invention relates to a process for keeping a tuyere passing through a metallurgical vessel free of a skull by intermittendly passing an oxygen-containing gas through the tuyere to dissolve the skull, wherein it is determined that an interval for passing said oxygen-containing gas through the tuyere needs to be started by detecting electromagnetic radiation emanating from a spot in the interior of the melt by means of a dual wavelength pyrometer and comparing the intensity of the pyrometer signals with the ratio of the pyrometer signals, and initiating said intervall for passing said oxygen-containing gas through the tuyere, upon the condition that the combined intensity of the signals falls below a predetermined threshold value and that the ratio of the signals remains substantially constant.
La présente invention se rapporte à un procédé permettant d'éviter la formation d'un fond de poche dans une tuyère traversant un récipient métallurgique, qui consiste à injecter de manière intermittente un gaz contenant de l'oxygène à travers la tuyère, afin de dissoudre le fond de poche. Afin de déterminer si un intervalle d'injection dudit gaz contenant de l'oxygène à travers la tuyère est nécessaire, l'on détecte le rayonnement électromagnétique émanant d'un point de l'intérieur du bain au moyen d'un pyromètre à double longueur d'onde, et l'on compare l'intensité des signaux du pyromètre au rapport des signaux du pyromètre. L'on débute ensuite ledit intervalle d'injection du gaz contenant de l'oxygène à travers la tuyère, si l'intensité combinée des signaux est inférieure à une valeur de seuil prédéterminée et le rapport des signaux reste sensiblement constant.
Carlhoff Christoph
Lamm Rolf
Merkens Wilhelm
Ridout & Maybee Llp
Specialty Minerals (michigan) Inc.
LandOfFree
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