Oxygen lance for converter steelmaking

Abstract

The invention relates to the technical field of oxygen top-blown steelmaking equipment, and discloses an oxygen lance for converter steelmaking. The oxygen lance for converter steelmaking comprises aninner pipe, wherein a middle pipe is arranged on the outer part of the inner pipe; an oxygen inlet pipe is arranged at the right end of the middle pipe; a water inlet pipe is arranged on the bottom part of the middle pipe; an outer pipe is arranged on the outer part of the middle pipe; a spray head is arranged at the left end of the outer pipe; and a water outlet pipe is arranged on the bottom part of the outer pipe. A protecting jacket and the outer pipe are separated through a filler, so that the temperature of the surface of the protecting jacket is close to the temperature of the inner part of a converter, and molten metal sprayed to the surface of the protecting jacket cannot be solidified and has good flowability; and through arranging a taper shape of the protecting jacket, the outer edges of two adjacent circular rings are staggered, and the molten metal on the surface of the protecting jacket drips along the inclined surfaces of the circular rings, so that the molten metal flowing stroke is shortened, the molten metal can quickly slip into a molten pool, an oxygen lance body cannot be thickened, normal lifting and extracting actions can be carried out during the whole blowing process, and the working efficiency of the converter is improved.

Description

technical field [0001] The invention relates to the technical field of oxygen top-blown steelmaking equipment, in particular to an oxygen lance for converter steelmaking. Background technique [0002] Oxygen lance is one of the main process equipment in oxygen converter steelmaking, which controls the contact area between oxygen jet and molten pool, the penetration depth of oxygen jet, the stirring state of molten pool, the oxidation degree of elements, and the heating rate of molten pool , Iron oxide content in slag and other important process factors play an important role in the removal of slag, splashing, impurities, converter steelmaking end point control and various steelmaking technical and economic indicators. The existing oxygen lance is mainly composed of nozzle, internal Pipe, middle pipe, outer pipe, oxygen inlet pipe, water inlet pipe, water outlet pipe, etc., such as figure 1 As shown, when in use, pour circulating cooling water into the oxygen lance through t...

AI Technical Summary

Problems solved by technology

[0003] 1. During the blowing process, the high-speed jet of the oxygen lance and the violent reaction of carbon and oxygen will generate a large amount of gas, which will cause the molten metal to splash, and the splashed molten metal will splash on the surface of the outer tube of the oxygen lance and flow down the outer tube. Because the inside of the oxygen lance is circulated with water, the molten metal on the surface of the outer tube gradually cools down and solidifies. Over time, a thick condensation layer is formed on the surface of the outer tube, and the gun body becomes thicker, which easily causes the oxygen lance to rise and fall at the water jacket of the hood Failure, even the oxygen lance cannot be lifted out, which seriously affects the converter blowing, the production cannot be carried out normally, and the operation rate of the converter is reduced

[0004] 2. The molten metal and metal skin condensed on the surface of the outer tube of the oxygen lance react violently with oxygen in a high-temperature environment, generating a large amount of heat, which makes the temperature of the molten metal and metal skin on the surface of the outer tube rise extremely rapidly, causing the outer tube wall to Burned through and leaked, causing major safety accidents

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