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A Method of Using CO2 to Control the High Temperature Ignition Point in the Jet Impact Zone of Converter Oxygen Lance

A technology of jet impact and converter oxygen lance, which is applied in the manufacture of converters, etc., can solve the problems of severe high-temperature heat radiation at the fire point, difficulty in effectively releasing heat, waste of input energy of the converter, etc., to reduce heat radiation, prevent overoxidation, The effect of improving energy utilization efficiency

Active Publication Date: 2019-03-01
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Due to the extremely complex physical and chemical changes inside the converter, the harsh smelting environment, and the limitations of current research methods, there are few reports on the research on the high-temperature fire point in the oxygen lance jet impact zone of the converter, and practitioners can only regard the converter as a "black box". System, analyze the relationship between converter materials, energy and momentum input and output, and perform fuzzy control
[0003] On the other hand, with the development of high-efficiency smelting technology, the oxygen supply intensity of the converter steelmaking process is continuously increasing. The high-intensity oxygen jet directly contacts the converter molten pool. In the jet impact zone, the strong metallurgical exothermic reaction leads to a sharp increase in heat. Limited by the transient heat absorption capacity of the converter steelmaking molten pool, it is difficult to effectively release the heat in the jet impact area, resulting in a high-temperature fire point area above 2700 °C, which causes a large amount of iron to evaporate. It is too late to pass into the molten pool, and as the flue gas is discharged, it will cause a huge waste of input energy of the converter

Method used

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  • A Method of Using CO2 to Control the High Temperature Ignition Point in the Jet Impact Zone of Converter Oxygen Lance
  • A Method of Using CO2 to Control the High Temperature Ignition Point in the Jet Impact Zone of Converter Oxygen Lance
  • A Method of Using CO2 to Control the High Temperature Ignition Point in the Jet Impact Zone of Converter Oxygen Lance

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Embodiment 1

[0020] The present invention is applied to the 150t converter steelmaking process, and the CO 2 with O 2 Homogeneous mixing while achieving CO 2 Dynamic adjustment of mixing ratio, O 2 -CO 2 The total flow rate of mixed injection is 34000Nm 3 / h, real-time monitoring of converter flue gas temperature.

[0021] 1) Before blowing starts, use a gas static mixer to mix CO 2 with O 2 Carry out premixing to ensure the stability of gas source pressure and flow;

[0022] 2) In the early stage of blowing, that is, within 0 to 5 minutes of blowing time, the oxygen lance is lowered to 1.6m from the molten steel surface, and the CO is controlled. 2 The injection ratio is 15%, the oxygen lance gas supply pressure is 0.9MPa, and the blowing is started to ensure the rapid temperature rise of the molten pool and slag removal, while inhibiting the oxidation and heat release of Si and Mn elements in the molten pool, and reducing the thermal radiation of the fire point.

[0023] 3) Withi...

Embodiment 2

[0028] The present invention is applied to the 300t converter steelmaking process, and the CO 2 with O 2 Homogeneous mixing while achieving CO 2 Dynamic adjustment of injection ratio, O 2 -CO 2 The total flow rate of mixed injection is 58000Nm 3 / h, real-time monitoring of converter flue gas temperature.

[0029] 1) Before blowing starts, use a gas static mixer to mix CO 2 with O 2 Uniform mixing to ensure stable gas source pressure and flow;

[0030] 2) Within 0-6 minutes of blowing time, the oxygen lance is lowered to 1.8m from the molten steel surface, and the CO is controlled 2 The blowing ratio is 14%, the air supply pressure of the oxygen lance is 0.92MPa, and the blowing is started to ensure the rapid temperature rise of the molten pool and slag removal, while inhibiting the oxidation and heat release of Si and Mn elements in the molten pool, and reducing the thermal radiation of the fire point;

[0031] 3) Within 6 to 12 minutes of blowing, the oxygen lance conti...

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Abstract

The invention relates to the technical field of steelmaking technology, in particular to a method for utilizing CO2 to control a high-temperature fire point at a jet flow impact area of a coverter oxygen lance. The method is suitable for the steelmaking process of a 30-400 t converter. According to the converter converting process, based on the metallurgical reaction characteristic of a molten pool, the CO2 proportion in a blowing gas is dynamically controlled at different periods, by utilizing the high-temperature reaction characteristic of CO2, at the earlier stage of converting, thermal radiation of the fire point is reduced, at the metaphase of converting, stirring of the molten pool is intensified to accelerate transmission of substance and energy between the fire point and the moltenpool, and at the later period of converting, peroxidation of molten steel is prevented, the metal yield is increased, and the temperature distribution and fire point volume of the oxygen lance jet flow impact area are controlled during the converting process to further improve the smelting effect.

Description

technical field [0001] The invention relates to the technical field of steelmaking technology, in particular to a 2 A method for controlling the high-temperature fire point in the jet impact zone of the oxygen lance of the converter. Background technique [0002] Due to the extremely complex physical and chemical changes inside the converter, the harsh smelting environment, and the limitations of current research methods, there are few reports on the research on the high-temperature fire point in the oxygen lance jet impact zone of the converter, and practitioners can only regard the converter as a "black box". The system analyzes the relationship between converter material, energy and momentum input and output, and performs fuzzy control. [0003] On the other hand, with the development of high-efficiency smelting technology, the oxygen supply intensity of the converter steelmaking process is continuously increasing. The high-intensity oxygen jet directly contacts the conv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/30C21C5/46
CPCC21C5/30C21C5/462
Inventor 朱荣韩宝臣魏光升刘润藻董凯武文合吕明冯超姜娟娟董建锋吴学涛王云胡绍岩朱长富
Owner UNIV OF SCI & TECH BEIJING
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