Accretion controlling tuyere

Details Accretion controlling tuyere Accretion controlling tuyere

C - Chemistry, Metallurgy

21

C

C21C 7/072 (2006.01) C21C 5/34 (2006.01) C21C 5/48 (2006.01) F27D 3/16 (2006.01)

Patent

CA 2132052

A tuyere for refining molten metals or melting metal scrap or oxides charged into a vessel. The tuyere comprises three concentric pipes of copper or stainless steel encased in refractory. An annular stream of natural gas surrounds an annular stream of oxygen which in turn surrounds a core stream of natural gas. All three streams are expanded as they flow through the tuyere and as a result an accretion forms at the tip of the tuyere. The accretion protects the tuyere and the gas streams are controlled so that the accretion is maintained at a desired size which neither blocks the tuyere, nor permits burnback of the pipes.

Cette invention concerne une tuyère d'affinage de métaux fondus ou de fusion de rebuts ou d'oxydes métalliques sous enceinte. La tuyère est formée de trois tuyaux coaxiaux en cuivre ou en acier inoxydable sous enveloppe réfractaire. La tuyère émet un jet annulaire de gaz naturel entourant un jet annulaire d'oxygène au coeur duquel se trouve un autre de jet de gaz naturel. Les trois jets se détendent en traversant la tuyère, détente qui donne lieu à la formation d'un dépôt au bout de la tuyère. Ce dépôt qui protège la tuyère est maintenu à dimension constante par un réglage judicieux des jets de gaz de façon à éviter à la fois le blocage de la tuyère et les risques de retour de flamme.

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