Shower nozzle of RH vacuum refining top lance

Abstract

The invention discloses a shower nozzle of an RH vacuum refining top lance. The shower nozzle comprises a Laval tube and a core tube which is coaxially arranged in the Laval tube, wherein a circular contracting tubular section and a circular expanding tubular section are formed between the Laval tube and the core tube. According to the circular contracting tubular section and the circular expanding tubular section provided by the invention, an oxygen flow is sprayed into a vacuum chamber with an ultrasonic speed, so that the working lance position can be lifted to reduce the splashed liquid steel adhering to the lance and reduce the consumption of cooling-water of the shower nozzle. A circular throat can more effectively prevent the lance from being blocked compared with a circular throat of existing shower nozzle of the top lance, so that the shower nozzle is longer in service life. The circular throat can increase the blowing oxygen flow under the condition of maintaining equalness of oxygen pressure and that of the conventional RH vacuum refining equipment, so that the efficiency of blowing oxygen to decarburize and blowing oxygen and adding aluminum to raise the temperature is improved. As the Laval tube, the core tube and the connecting structure therebetween are simple, compared with existing shower nozzle of the top lance, the shower nozzle is not precisely casted and the manufacturing difficulty is remarkably reduced.

Description

technical field [0001] The invention relates to a vacuum degassing device used for refining outside a furnace in the metallurgical industry, in particular to a nozzle of a top gun for RH vacuum refining. Background technique [0002] Molten steel vacuum circulation degassing (RH) technology is a secondary refining process of molten steel, which is a necessary means of out-of-furnace refining for the production of high-quality steel. RH vacuum refining equipment was originally used for degassing molten steel. Its metallurgical principle is to rely on pressure difference to lift molten steel into a vacuum chamber, and to circulate molten steel by blowing argon, and use the vacuum environment to achieve the purpose of degassing (N2, H2, O2). , which has the advantages of fast reaction speed, high vacuum degree and good metallurgical effect. In recent years, the KTB (Kawasaki Top Blowing) overhead oxygen lance developed by Kawasaki has enabled RH vacuum refining to have more fu...

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Problems solved by technology

[0004] In view of this, the purpose of the present invention is to provide a nozzle for RH vacuum refining top lance, so as to overcome the shortcomings of existing top lance nozzles such as high manufacturing difficulty, easy to block the nozzle, and low service life.

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