Blowing method of converter and oxygen lance

Abstract

The invention discloses a blowing method of a converter and an oxygen lance. The blowing method of the converter comprises the following steps: additionally arranging a nitrogen branch on an oxygen supply pipeline of the oxygen lance; and enabling the oxygen lance to simultaneously blow oxygen and high-pressure nitrogen into steel liquid in the converter in the earlier, middle and later stages of blowing. The blowing method and the oxygen lance have the following advantages that the change for equipment is small, and the cost is relatively low; the implementation and operation costs are low, and the operation is simple and convenient; the metal yield is increased, the service life of a copper head of the oxygen lance is prolonged, and the possibility of explosion venting caused by electric dust removal is reduced; the slag discharging time is shortened; the effect of carbon content retaining steel tapping in the final stage of blowing is obvious; meanwhile, the temperature and components in a molten pool are evened; and the problem that the bottom blowing effect of a conventional top and bottom combined blowing converter in the intermediate campaign is not obvious can be solved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a converter blowing method and an oxygen lance. Background technique [0002] At the beginning of converter blowing, due to the structure of scrap steel or the amount of slag left in the furnace, there may be a phenomenon of failure to ignite. The harm is to reduce the metal yield, burn the copper head of the oxygen lance, and cause explosion venting due to electrostatic precipitator, which is serious. Sometimes even explosive splashes are generated, which expands the accident. The existing resource conditions and solutions in the industry cannot prevent the occurrence of similar accidents. [0003] When converters choose double slag smelting, it is a difficult problem to solve the problem of high slag surface and many metal droplets in slag. Most of the time, slag with small specific surface area is used to defoam it, but The effect is less pronounced. Sometimes it even ta...

AI Technical Summary

Problems solved by technology

[0005] The bottom blowing effect of the traditional top-bottom combined blowing converter is not so obvious in the middle of the furnace operation, followed by defects such as poor stirring of the molten pool, low metal yield, uneven composition and temperature, etc.

Some places adopt quick-change bottom blowing technology and gas supply original flow monitoring technology, the effect is not bad, but the investment cost is very high

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