BLOWING LANCE WITH DIRECT IGNITION THROUGH RETRACTABLE IGNITION LANCE Russian patent published in 2017 - IPC C21C5/48 C21C7/10 F27B3/22 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy and can be used for vacuum treatment of molten metal by means of blast lance. Blast lance comprises an outer jacket, which extends along a blast lance longitudinal axis, where an oxygen guide runs within outer jacket and comprises an oxygen exit at end. Inside outer side surface there is a channel for combustible gas, which has outlets for exit of combustible gas at end. In lance there is an ignition device with an ignition tip for ignition of combustible gas mixture. Ignition device can move between extended position and retracted position. In extended position ignition tip acts on mixing area, in which combustible gas supplied to oxygen outlet and combustible gas exiting through outlets for combustible gas are mixed to produce a combustible gas mixture. In retracted position ignition device is retracted into a protective area for protection against splashes of molten metal.

EFFECT: invention enables to reliably perform ignition of combustible mixture formed at end for purge gas outlet.

13 cl, 16 dwg