METHOD AND APPARATUS FOR ELIMINATING NOSE-SKULLS FROM BOTTOM-BLOWN OXYGEN METAL REFINING VESSELS

摘要

1503354 Eliminating nose-skulls in metal refining vessels USS ENG & CONSULTANTS Inc 21 May 1975 [22 May 1974] 21929/75 Heading F4B In a bottom-blown oxygen metal refining vessel 10 that has oxygen containing gas introduced into the hearth section through a tuyere 20, the nose-skull build up 32 is substantially eliminated by injecting a second oxygen containing gas and fuel into the vessel nose section through tuyeres 40. The fuel together with any carbon monoxide rising from the vessel hearth are burnt and create sufficient additional heat in the nose section to prevent molten particles solidifying on the vessel nose section walls. The tuyeres 40 and 20 may be a double-pipe construction wherein oxygen or an oxygen containing gas is injected through the central pipes 42 and 22 and a combustible coolant fluid is injected through the concentric pipes 44 and 24. The tuyeres 44 are positioned over the trunnions 18 so that they are not submerged when the vessel is tilted. Side tuyeres 26 may be fitted to the vessel to assist in scrap melting. The tuyeres 44 may be used continuously or periodically during the refining operation according to requirements.