Movement control method for melting slag at mouth of furnace by using oxygen lance

By calculating the upper and lower limits of oxygen lance movement and the stopping point, and combining real-time slag area classification, the oxygen flow rate and speed are optimized, solving the problem of inaccuracy in slag formation at the furnace mouth of the oxygen lance melting furnace, and achieving safer and more efficient melting control.

CN120945158APending Publication Date: 2025-11-14SHANGHAI MEISHAN IRON & STEEL CO LTD
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Patent Information

Application Number
CN202410596361.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-05-14
Publication Date
2025-11-14

AI Technical Summary

Technical Problem

In existing technologies, the slagging operation at the oxygen lance melting furnace mouth lacks precise control, which can easily lead to burn-through of the cooling pipes of the movable fume hood near the furnace mouth, resulting in safety risks and production obstacles.

Method used

By calculating the upper and lower limits of oxygen lance movement and the stopping point, and combining this with real-time slag area classification, the oxygen flow rate, velocity, and residence time are optimized to achieve precise control of slag formation at the oxygen lance melting furnace mouth.

Benefits of technology

Precise control of slag buildup at the oxygen lance melting furnace opening reduces damage to the cooling pipes of the movable fume hood, improving production safety and efficiency.

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Abstract

The invention relates to a movement control method for melting slag at a furnace mouth by using an oxygen lance, and belongs to the technical field of adjustment or control of blowing. The method comprises the following steps: firstly, calculating an upper limit and a lower limit of movement of the oxygen lance, and setting at least three stop points between the upper limit and the lower limit; then, the furnace mouth slag bonding area is collected in real time and divided into three slag bonding types including the large slag amount, the medium slag amount and the small slag amount, and parameters of the medium slag amount type are set as reference parameters; then optimizing the oxygen flow and the total oxygen consumption of the oxygen lance according to the slagging type; the stop time and the moving speed of the oxygen lance working at the stop point are calculated according to the optimized oxygen flow and the reference parameters; and finally, executing work circulation or ending under the condition that the real-time total oxygen consumption reaches the optimized total oxygen consumption. Due to the reasonable control of the upper and lower limits of movement, the movement speed and the stop time of the oxygen lance and the reasonable calculation of the oxygen flow and the total oxygen consumption, the movement operation of the oxygen lance during slag bonding at the melting furnace mouth can be more accurately controlled.
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