An Oxygen Lance Nozzle with Concentrated Stream

Abstract

The invention relates to an oxygen lance nozzle with concentrated streams, which belongs to the technical field of converter oxygen lance equipment and is used for improving indexes of top-blown oxygen steelmaking of a converter. According to the technical scheme, four oxygen lance spray holes are uniformly distributed around the center of the end surface of the nozzle to form a circle, the diameter of the circle is 140-150mm and the included angles between the spray holes of the nozzle are 11.5 degrees-13.5 degrees. According to the oxygen lance nozzle provided by the invention, the diameter of the circle formed by the oxygen lance spray holes and the included angles between the oxygen lance spray holes are changed, more concentrated oxygen jet flows are obtained, an impact region formed by four streams has a small total heat dissipation area and concentrated reaction points; and the oxygen lance nozzle has the advantages of capability of fast entering in a C-O reaction period, high recovery of coal gas, high residual manganese in molten steel, balanced erosion to a furnace liner, low consumption of steel and iron material and the like; simultaneously, due to the concentrated streams, the position of the lance is higher than that of a conventional oxygen lance in the blowing process and far away from a reaction area, the risk of erosion or burning loss of the nozzle is greatly reduced and the service life of the nozzle is prolonged.

Description

technical field [0001] The invention relates to an oxygen lance nozzle in oxygen supply equipment for oxygen top-blown converter steelmaking, and belongs to the technical field of converter oxygen lance equipment. Background technique [0002] In oxygen top-blown converter steelmaking, the oxygen lance nozzle is the central part of the oxygen lance. During the converter blowing period, the oxygen jet generated by the oxygen lance nozzle not only participates in the oxidation-reduction reaction between slag and steel in the molten pool, but also provides Stirring power has an important influence on the thermodynamic and kinetic conditions of the reaction in the molten pool. Whether the nozzle design concept and parameters are reasonable or not will result in large differences in metallurgical effects, which not only directly affect the economic and technical indicators of the converter, but also affect the service life of the oxygen lance nozzle. [0003] The design concept ...

AI Technical Summary

Problems solved by technology

[0004] (1) The impact points of the four streams are relatively scattered. Although the oxygen supply area is relatively large, when smelting low-temperature molten iron or scrap steel is large and the temperature of the molten pool is low, large-scale oxygen blowing causes slow temperature rise and cannot rapidly increase the melting temperature. Therefore, the speed of entering the C-O reaction period is slow, and it is easy to accumulate FeO in the slag in the early stage, resulting in the flow of black slag or even splashing in the early stage, which is difficult to suppress

[0005] (2) In the early stage of smelting, the temperature of the molten pool is low, the temperature rises slowly, and the time to enter the C-O reaction period is late. During this period, the low-content gas generated by the reaction is forced to be released into the atmosphere. CO pollution

[0006] (3) There are more FeO in slag, resulting in strong oxidation of molten steel, low residual Mn at the end of molten steel, and high O content in steel, resulting in high consumption of alloy materials

[0007] (4) Due to the dispersion of the impact stream, the molten steel is agitated by the stream, and the furnace wall and the joint between the furnace wall and the furnace bottom are scoured heavily. Furnace age is low

[0008] (5) Due to the dispersion of the impact stream, under normal operating conditions, the distance between the nozzle of the oxygen lance and the liquid level of the molten pool is relatively low, the nozzle is more likely to be eroded by the high-temperature molten steel, and the life of the nozzle is affected. The conditions are more severe, resulting in generally lower nozzle life

[0009] (6) There is a lot of FeO in slag, and it is difficult to suppress the FeO content in slag simply by operation, resulting in high consumption of steel materials

Images