Oxygen lance nozzle with concentrated streams

A technology of oxygen lance nozzles and concentrated streams, which is applied in the manufacture of converters, etc., can solve the problems of low resource recovery and utilization rate, difficulty in suppressing jet black slag splashing, and low economic furnace life, so as to improve the adaptability of raw materials and improve the efficiency of gas The effect of early recovery time and small attenuation of oxygen flow

CN103993127AActive Publication Date: 2014-08-20HEBEI TANGYIN IRON & STEEL
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2014-08-20

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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.
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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 ...

Examples

Embodiment Construction

[0026] The principle of the cluster oxygen lance is to increase the outer surrounding accompanying flow around the traditional oxygen lance, so that the expansion and attenuation of the supersonic jet in the center is smaller, the supersonic jet is longer, and the penetration depth and stirring intensity of the oxygen jet to the molten pool are improved. Due to the delayed decay of the jet velocity, the blowing lance position of the oxygen lance can be increased without affecting the impact depth of the jet on the molten steel. This oxygen lance nozzle refers to the design idea of ​​clustering oxygen lances to reduce jet attenuation, but does not adopt the method of surrounding the accompanying flow on the outer layer, but achieves the purpose of reducing oxygen jet attenuation through a more concentrated oxygen stream than conventional oxygen lances. To achieve the effect of micro-bundling. The oxygen lance nozzle designed with the concept of micro cluster adopts the design m...