Double-flow oxygen gun and use method thereof

Abstract

The invention relates to a double-flow oxygen gun and a use method thereof, and belongs to the technical field of converter steelmaking. The double-flow oxygen gun has the advantages that a novel structure is used, and the converter steelmaking heat efficiency is improved, so that the converter cold material ratio, the slag melting effect and the terminal temperature hit rate are improved. Oxygen gun main holes and sub holes are formed in the spray head. The number of main holes and the number of sub holes at an oxygen inlet in the oxygen inlet direction of the spray head are identical; in the oxygen outlet direction of the spray head, the number of the main holes is unchanged, and the number of the sub holes at the outlet can be 1 to 3 times of the number of the sub holes at the inlet. The number of the main holes at the outlet of the spray head is 3 to 6, and the number of the sub holes is 6 to 15. The flow rate of the main holes accounts for more than 85 percent of the total flow rate; the flow rate of the sub holes accounts for less than 15 percent of the total oxygen supply. The outlet direction of the sub holes is not limited by the inlet direction of the sub holes, can be in various directions, and can be downward, horizontal and upward, so that the secondary combustion rate of a converter is sufficiently improved. During the oxygen gun operation, the blowing gun position is 100 to 200 mm higher than a conventional gun position; the slag sputtering gun position is 50 to 100mm higher than the conventional oxygen gun position.

Description

technical field [0001] The invention belongs to the technical field of converter steelmaking, and in particular relates to a structural design of a converter oxygen lance nozzle and an application method thereof. Background technique [0002] At present, many steel mills increase steel production by increasing the amount of steel scrap and iron ore added. However, with the increase of scrap steel and iron ore, the heat of the molten pool is obviously insufficient, which cannot meet the requirements of the molten steel temperature at the end of smelting. This problem is usually alleviated by adding a thermal compensator, such as anthracite or ferrosilicon alloy. After adding the heat compensating agent, not only the cost per ton of steel and the sulfur load of molten steel are increased, but also the smelting time is prolonged, which is not worth the candle in terms of economy and production efficiency. At the same time, the adoption of this technology is also subject to th...

AI Technical Summary

Problems solved by technology

[0005] (1) The auxiliary oxygen hole channel occupies a large water cooling space of the nozzle, which reduces the service life of the nozzle;

[0006] (2) Due to the limitation of the cooling space in the inner cavity of the nozzle, the increase in the number of secondary hole outlets is restricted, which affects the performance of the secondary combustion effect;

[0007] (3) Secondary combustion produces a large amount of CO 2 , which reduces the concentration of converter gas and affects the recovered gas volume of converter gas;

[0008] (4) Secondary combustion oxygen lances, especially double-channel oxygen lances, the auxiliary holes occupy more flow, resulting in poor converter slag splashing effect

[0009] The above reasons limit the application of the secondary combustion oxygen lance in the converter

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