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Molten Iron Blowing Desulfurization Method with L-shaped Spray Lance Eccentrically Inserted into Molten Pool

The technology of spray gun and molten iron is applied in the field of molten iron injection desulfurization and molten iron injection desulfurization in which the L-shaped spray gun is eccentrically inserted into the molten pool. Conducive to desulfurization kinetic conditions and the effect of reducing desulfurizer consumption

Inactive Publication Date: 2016-06-29
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the above-mentioned patented technology can improve the dynamic conditions of injection desulfurization to a certain extent, it has not been applied in actual production due to the complex implementation of technical solutions, difficulty in implementation, and insufficient reliability. Therefore, it is necessary to Carry out research on new technologies with simple implementation, convenient operation, stable and reliable operation, and excellent improvement effects, and continuously improve the technical and economic indicators of molten iron injection desulfurization

Method used

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  • Molten Iron Blowing Desulfurization Method with L-shaped Spray Lance Eccentrically Inserted into Molten Pool
  • Molten Iron Blowing Desulfurization Method with L-shaped Spray Lance Eccentrically Inserted into Molten Pool
  • Molten Iron Blowing Desulfurization Method with L-shaped Spray Lance Eccentrically Inserted into Molten Pool

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Effect test

Embodiment 1

[0019] A hot metal injection desulfurization method (applicable to hot metal tanks), such as figure 1 As shown, the process flow field is the same as the conventional molten iron tank desulfurization method, which is mainly composed of molten iron entering the station, temperature measurement sampling, primary slagging, gun down, injection, temperature measurement and sampling, secondary slagging, and molten iron leaving the station. In the molten iron tank injection desulfurization, the angle α between the axis of the L-shaped spray gun and the central axis of the molten iron tank is 5°, the downward inclination angle β of the nozzle axis of the spray gun is 1°, and the distance d between the nozzle end face of the spray gun and the central axis of the molten pool is 300mm. During the blowing process, the blowing flow rate of the L-shaped spray gun and the insertion depth of the molten iron are the same as the conventional desulfurization process.

Embodiment 2

[0021] A hot metal injection desulfurization method (applicable to hot metal tanks), such as figure 1 As shown, the process flow field is the same as the conventional molten iron tank desulfurization method, which is mainly composed of molten iron entering the station, temperature measurement sampling, primary slagging, gun down, injection, temperature measurement and sampling, secondary slagging, and molten iron leaving the station. In hot metal spray desulfurization, the angle α between the axis of the L-shaped spray gun and the central axis of the molten iron tank is 10°, the downward inclination angle β of the nozzle axis of the spray gun is 1°, and the distance d between the nozzle end face of the spray gun and the central axis of the molten pool is 250mm. During the blowing process, the blowing flow rate of the L-shaped spray gun and the insertion depth of the molten iron are the same as the conventional desulfurization process.

Embodiment 3

[0023] A hot metal injection desulfurization method (applicable to hot metal tanks), such as figure 1 As shown, the process flow field is the same as the conventional molten iron tank desulfurization method, which is mainly composed of molten iron entering the station, temperature measurement sampling, primary slagging, gun down, injection, temperature measurement and sampling, secondary slagging, and molten iron leaving the station. In torpedo tank blowing desulfurization, the angle α between the axis of the L-shaped spray gun and the center axis of the molten iron tank is 13°, the downward inclination angle β of the nozzle axis of the spray gun is 2°, and the distance d from the nozzle end face of the spray gun to the center axis of the molten pool is 275mm. During the blowing process, the blowing flow rate of the L-shaped spray gun and the insertion depth of the molten iron are the same as the conventional desulfurization process.

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Abstract

The invention discloses a method for blowing desulfurization of molten iron by eccentrically inserting an L-shaped spray gun into a molten pool. The blowing desulfurization of the molten iron comprises the steps of charging the molten iron into a station, measuring temperature and sampling, removing the spray gun and blowing, discharging the molten iron from the station, and the like. The method is characterized in that during the spray gun removal and blowing process, the L-shaped spray gun is inserted into a tank filled with the molten iron; an alpha angle is formed between the axis of the L-shaped spray gun and the center axis of the molten iron tank, and the spray nozzle of the spray gun points to the center axis of the molten iron tank; the downward inclination angle beta of the axis of the spray nozzle of the L-shaped spray gun is 0-5 degrees; the distance d between the end surface of the spray nozzle of the L-shaped spray gun and the center axis of the molten pool is 200-350mm, wherein alpha is 0-15 degrees. By adopting the method disclosed by the invention, during the blowing desulfurization process, the interference of a spray gun body to blowing gas during the stream floating process and the consumption of the stirring kinetic energy of the blowing gas can be avoided; the kinetic conditions of desulfurization in the molten pool can be improved beneficially; the consumption of a desulfurizing agent can be reduced; the desulfurization production efficiency can be improved; moreover, the abrasion of the blowing stream to the spray gun body can be reduced; the maintenance times of the spray gun can be reduced; the desulfurization production cost can be reduced.

Description

Technical field [0001] The invention relates to a molten iron spray desulfurization method, in particular to a molten iron spray desulfurization method in which an L-shaped spray gun is eccentrically inserted into a molten pool, and belongs to the field of molten iron pretreatment. Background technique [0002] Sulfur is a harmful element in most steel grades. It exists in the steel in the form of sulfide and has a considerable impact on the quality of steel. At present, hot metal desulfurization outside the furnace has become an indispensable technical means in the production of low-sulfur steel (S≤0.010%) or very low-sulfur steel (S≤0.005%). Among many desulfurization methods, injection desulfurization has been widely promoted and applied at home and abroad due to its low one-time investment and simple control. The specific process is: using a spray gun inserted into the depth of the molten iron, the desulfurization powder is sprayed into the depth of the molten iron in the co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C1/02C21C7/064
Inventor 李明晖欧阳德刚邓品团韩斌丁翠娇朱善合罗巍王海清刘刚锋
Owner 武汉钢铁有限公司