RII upstream pipe gas-supplying method and apparatus

This invention has publicized the method and equipment of one kind RH ascending pipe air feed, its installment has the RH ascending pipe, air feed nozzle, its characteristic is the air feed nozzle axis direction, that is to say, the air blowing direction is arranged around the RH ascending pipe, the projection of air feed nozzle direction in the vertical plane of the RH ascending pipes axis is tangency with the concentric circles which shaped by the plane, the radius of the tangency concentric circles is r; the linear velocity of molten steel of this invention distribute evenly in the vertical direction in the RH ascending pipe, which solves in the molten steel spitting problem in RH vacuum chamber, and enhances the service life of RH ascending pipe; Simultaneously, the air bubble dissemination distributes in the steelfluid, the specific surface area of air bubble increase, strengthen self-decarbonization; enhance the added 'the saturation value' of molten steel circulation current with the increasing of heactuation gas flow amount, which enormously enhanced the response speed; the molten steel has formed the level speed in the RH ascending pipe, after the molten steel entering the RH vacuum chamber, its horizontal direction speed drive the around molten steel to run, which reduce the molten steel volume in the RH vacuum chamber dead region and enhance the RH production efficiency.