Air curtain skimming device for steel-making converter

Abstract

The invention discloses a gas curtain slag device of rotary furnace in the metallurgical smelting technical domain, which consists of rotary furnace bulk and tap hole on the furnace, wherein the ring-shaped air chamber is set in the cuff brick of steel outlet hole; the ring-shaped air gap interconnects the inlet pipe of ring-shaped air chamber; the ring-shaped air chamber interconnects ring-shaped air gap with inlet pipe connecting gas source; the separation angle B of ring-shaped air gap and inner wall of outlet steel is 20-40 deg. The invention breaks the vortex from steel outlet, which outputs clean steel.

Description

technical field [0001] The invention relates to a steelmaking device, in particular to an air curtain slag blocking device used in converter steelmaking and tapping, and belongs to the technical field of iron and steel metallurgy. Background technique [0002] With the continuous development of various technologies in the iron and steel metallurgical industry, converter-refining furnace and full continuous casting process for producing high-quality steel are more and more widely used, and the market demand for high-quality steel is increasing. In the production of high-quality steel, less or no slag is an important factor for obtaining high-quality products. How to control inclusions and make molten steel cleaner has been the direction that people in the industry have been trying to explore for a long time. The increase of molten steel inclusions caused by the slag of converter tapping has always been a problem that plagues smelting technology. At present, various iron and...

AI Technical Summary

Problems solved by technology

The problem with this method is: due to the uncertainty of the timing of adding the slag retaining ball (cone) and the drift of the slag retaining ball (cone), the slag retaining rate can generally only reach about 80%, and the converter cannot be controlled during the tapping process. The slag involved in the eddy current

In addition, the consumption of refractory materials used in the slag blocking ball (cone) is relatively large, which leads to an increase in the production cost of steelmaking

Chinese patent 86200541 once disclosed a separate gas slag blocking device. The device is equipped with a cylinder and a slag blocking arm at the tapping hole of the converter. The gas pipeline system is connected with the slag blocking arm. slag, the whole device is installed outside the converter, the structure is complicated and it is not easy to implement

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