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Converter smelting method based on flue gas analysis

A converter smelting and flue gas analysis technology, applied in the field of iron and steel metallurgy, can solve the problems of being susceptible to external noise interference, low prediction success rate, poor equipment stability, etc. Yield effect

Inactive Publication Date: 2021-06-04
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the technology described in patent 201210021336.7 has problems such as poor equipment stability, easy to be disturbed by external noise, and low predictive success rate, so it is difficult to be widely used

Method used

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  • Converter smelting method based on flue gas analysis

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The technical method of the present invention is used to smelt in a converter with a nominal capacity of 120t. The smelting mode selects the one-button steelmaking mode. The process parameters are automatically calculated and controlled by the converter secondary blowing model, and the flue gas analysis model provides flue gas composition analysis. The data and provide the judgment result of returning dry to participate in the control of the oxygen lance position.

[0022] The secondary blowing model of the converter calculates the total amount of oxygen blowing in the main blowing stage to be 5982Nm based on data such as molten iron, scrap steel and target composition information. 3 . Oxygen blowing capacity reaches 2601Nm 3 When 60% of the total oxygen blowing volume was added, 301kg of pellets were added, and the flue gas analysis results showed that the CO content in the flue gas rose rapidly from 52% to the highest 72%, and then dropped rapidly. The CO content in...

Embodiment 2

[0025] The technical method of the present invention is used to smelt in a converter with a nominal capacity of 120t. The smelting mode selects the one-button steelmaking mode. The process parameters are automatically calculated and controlled by the converter secondary blowing model, and the flue gas analysis model provides flue gas composition analysis. The data and provide the judgment result of returning dry to participate in the control of the oxygen lance position.

[0026] The secondary blowing model of the converter calculates the total amount of oxygen blowing in the main blowing stage to be 6214Nm based on data such as molten iron, scrap steel and target composition information. 3 . Oxygen blowing capacity reaches 3728Nm 3 When 60% of the total oxygen blowing volume was added, 306 kg of pellets were added, and the flue gas analysis results showed that the CO content in the flue gas rose rapidly from 57% to the highest 68%, and then dropped rapidly. The CO content i...

Embodiment 3

[0029] The technical method of the present invention is used to smelt in a converter with a nominal capacity of 120t. The smelting mode selects the one-button steelmaking mode. The process parameters are automatically calculated and controlled by the converter secondary blowing model, and the flue gas analysis model provides flue gas composition analysis. The data and provide the judgment result of returning dry to participate in the control of the oxygen lance position.

[0030] The secondary blowing model of the converter calculates the total amount of oxygen blowing in the main blowing stage to be 6121Nm based on data such as molten iron, scrap steel and target composition information. 3 . Oxygen blowing capacity reaches 3673Nm 3 When 296kg of pellets were added, the CO content in the flue gas rose rapidly from 47% to the highest 74% and then dropped rapidly. The CO content increased by 27%, and the flue gas analysis model judged that the slag was dry, and the position of...

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Abstract

The invention discloses a converter smelting method based on flue gas analysis. The method is used for reducing back-drying of slag and comprises the following steps that 1, 250-350kg of pellets are added into a converter when the oxygen blowing amount of the converter reaches 55%-65% of the total oxygen blowing amount; 2, after the pellets are added, the content of CO in flue gas in the converter is detected; 3, when the increase amount of the CO content is larger than or equal to 20%, the slag returns to be dry, the lance position of an oxygen lance is increased by 10 cm, and oxygen blowing continues for 60 s; and 4, when the increase amount of the CO content is smaller than 20%, the slag does not return to be dried, and the oxygen lance continues blowing according to the original lance position. Compared with an existing slag return drying monitoring and control method, the converter dephosphorization efficiency is greatly improved, and the problem of molten steel splashing caused by slag drying is solved.

Description

technical field [0001] The present application relates to the field of iron and steel metallurgy, in particular to a converter smelting method based on flue gas analysis. Background technique [0002] During the converter blowing process, slag with a certain alkalinity and fluidity will be obtained by controlling the position of the oxygen lance and the flow rate of oxygen, and adding slag-forming materials such as lime, light-burned dolomite, pellets, and magnesium balls. Oxygen, slag and molten steel contact each other and undergo a chemical reaction to remove silicon, phosphorus, sulfur and other impurity elements from molten steel. After blowing enters the high-speed decarburization period, in order to ensure a high decarburization speed, the oxygen lance position is generally set lower. A lower lance position will lead to a reduction in iron oxidation in the molten pool, resulting in a reduction in the source of FeO in the slag. On the other hand, the intense decarburi...

Claims

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Application Information

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IPC IPC(8): C21C5/28C21C5/30
CPCC21C5/28C21C5/30C21C2300/06Y02P10/25
Inventor 刘飞王耀马建超邹长东李志军
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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