Appts. to prevent flue gas formation in metallurgical process

摘要

Device for avoiding the formation of flue gases in metallurgical processes and when transporting molten metal from metallurgical vessels, esp. blast furnaces (10) to casting vessels has esp. discharge channels (15-16) which take the molten metal from the furnace's casting outlet, covered by hoods (22-24) so that minimal space exists above the molten metal. The transfer stations (17-19) at which the metal transfers esp. from the transporter and discharge channels into the casting vessel, and the outflow openings are shielded to render them gas tight. Inert gas flushes through this transfer point and the space in the covered channels. An inert gas mantel, circular in cross-section, protects the molten stream as it flows from the outlet into the casting vessel, and is generated at a pressure of pref. 1.5 bar. An inert gas pressure of pref. between 10 and 100 Pa above the external pressure is maintained in the furnace or transport unit, or both esp. over the transport and discharge channels, also at the transition pt. and in the interior of the casting vessel. The inert gas also serves to cool the covers and shielding mechanisms and comprises nitrogen or similar gas, whose free oxygen component has been consumed by burning in a combustion chamber and which is finally cooled.