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a bottom blow o 2 -co 2 -Cao converter steelmaking process dynamic control method

A technology of o2-co2-cao and converter steelmaking, which is applied in steel manufacturing process, manufacturing converters, sustainable manufacturing/processing, etc. It can solve the problems of molten steel overoxidation, large fluctuation of end point composition, long blowing time, etc. problems, to avoid overoxidation, promote the balance of metallurgical reactions, and improve the quality of molten steel

Active Publication Date: 2021-06-11
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above problems, the present invention proposes a bottom-blown O 2 -CO 2 -CaO converter steelmaking process dynamic control method, which solves the existing technical problems such as large fluctuations in the final composition of the conventional converter steelmaking process, overoxidation of molten steel, and long blowing time

Method used

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  • a bottom blow o <sub>2</sub> -co <sub>2</sub> -Cao converter steelmaking process dynamic control method

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Embodiment 1

[0026] 3. Embodiment 1: the present invention is applied to blow O at the bottom of 120t 2 -CO 2 -CaO converter steelmaking process, the top blowing gas is O 2 , the bottom-blown central gas includes O 2 +CO 2 , the protective gas for the bottom blown ring seam is CH 4 . Specific steps are as follows:

[0027] 1): The temperature of molten iron collected through the raw material parameter acquisition system is 1300°C, and the carbon content of molten iron is [%C] 0 =4.0%, silicon content [%Si] 0 =0.60%, phosphorus content is [%P] 0 =0.109%, the scrap carbon content is [%C] 0 =0.10%, silicon content [%Si] 0 =0.25%, phosphorus content is [%P] 0 =0.020%, the steel scrap ratio is 15%, the target carbon content is 0.02%, and the target temperature is 1635°C, which is transmitted to the blowing parameter calculation module, and the operation process in the early stage of blowing is formulated through the central control system.

[0028] 2): In the early stage of blowing, ...

Embodiment 2

[0032] Embodiment 2: The present invention is applied to blowing O at the bottom of 300t 2 -CO 2 -CaO converter steelmaking process, the top blowing gas is O 2 , the bottom-blown central gas includes O 2 +CO 2 , the protective gas for the bottom blown ring seam is CH 4 . Specific steps are as follows:

[0033] 1): The temperature of molten iron collected through the raw material parameter acquisition system is 1300°C, and the carbon content of molten iron is [%C] 0 =4.0%, silicon content [%Si] 0 =0.50%, phosphorus content is [%P] 0 =0.100%, the scrap carbon content is [%C] 0 =0.15%, silicon content [%Si] 0 =0.20%, phosphorus content is [%P] 0 =0.020%, the steel scrap ratio is 15%, the target carbon content is 0.02%, and the target temperature is 1635°C, which is transmitted to the blowing parameter calculation module, and the operation process in the early stage of blowing is formulated through the central control system.

[0034] 2): In the early stage of blowing, ...

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Abstract

A bottom-blown O 2 ‑CO 2 ‑CaO converter steelmaking process dynamic control method, belonging to the field of steelmaking technology, applicable to 30‑300t bottom blowing O 2 ‑CO 2 ‑CaO converter steelmaking process. Bottom Blow O 2 ‑CO 2 ‑CaO converter steelmaking process, using O 2 As top blowing gas, O 2 +CO 2 The mixed gas is used as the bottom-blowing carrier gas, and the lime powder is sprayed into the furnace from the bottom-blowing lance. Combined with the composition data of molten iron and steel scrap in the furnace, the furnace gas composition data during the converter blowing process and the working conditions of the bottom blowing equipment, the converter smelting process is carried out based on material conservation. Predict the molten steel composition in the steel process, and dynamically adjust the top blowing oxygen amount, bottom blowing gas ratio and lime powder flow rate in stages according to the target composition requirements of the blowing end point, and strengthen the converter molten pool while reducing the temperature of the bottom blowing ignition point area Stirring effect, promote the balance of slag-gold reaction, reduce the carbon content and phosphorus content of molten steel; at the same time avoid overoxidation at the end of converter blowing, reduce the consumption of deoxidized alloys, reduce the number of inclusions in steel, and improve the quality of molten steel; in high efficiency On the basis of metallurgical reactions, the metal yield is increased again, the production cost is reduced, and the smelting cycle is shortened.

Description

technical field [0001] The invention relates to the technical field of steelmaking technology, in particular to a bottom-blown O 2 -CO 2 -CaO converter steelmaking process dynamic control method. Background technique [0002] The converter steelmaking process can process molten iron and steel scrap of various compositions, and the furnace charge can be flexibly adjusted, and the blowing cycle is short and the production capacity is strong, so it has become the most widely used steelmaking method in the world. The converter steelmaking process uses top blowing oxygen as a means of heating and stirring the molten pool, and cooperates with bottom blowing to strengthen the stirring of the molten pool to provide better kinetic conditions for metallurgical reactions, and to produce carbon content, phosphorus content and temperature at the end point. molten steel. However, in the conventional converter smelting process, the stirring of the molten pool is not strong enough, and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/35C21C7/00
CPCC21C5/35C21C7/0037C21C2300/06Y02P10/25Y02P10/143C21C5/48C21B7/16
Inventor 朱荣李伟峰魏光升董凯冯超刘润藻周赟韩宝臣吴学涛
Owner UNIV OF SCI & TECH BEIJING
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