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A method of bottom blowing hydrogen to achieve high scrap ratio smelting in converter

A technology of scrap steel ratio and hydrogen, which is applied in the field of iron and steel metallurgy, can solve the problems of increasing the smelting cycle of scrap steel oxidation, the limited improvement effect of converter scrap steel, and increasing carbon emissions, so as to achieve the effect of reducing carbon emissions, reducing consumption, and increasing converter scrap steel ratio

Active Publication Date: 2022-07-05
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ladle capping operation is simple and the effect is obvious, but the effect of increasing the scrap ratio of the converter is limited; scrap preheating increases the amount of scrap added by reducing the heat of melting scrap, but faces the problems of increasing the smelting cycle and scrap oxidation; existing heating agents include carbon Carbonaceous exothermic agents are mostly practiced because the product is gas, which has little impact on converter smelting, but it may cause problems of increasing sulfur in molten steel and increasing carbon emissions

Method used

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  • A method of bottom blowing hydrogen to achieve high scrap ratio smelting in converter
  • A method of bottom blowing hydrogen to achieve high scrap ratio smelting in converter

Examples

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Effect test

example 1

[0013] A 100t top-bottom double blowing converter is used, the molten iron temperature is 1320℃, the scrap ratio is 40%, and the scrap preheating temperature is 400℃; in the early stage of blowing, the oxygen supply intensity is 4.2Nm 3 / (min t), the bottom blowing hydrogen intensity is 1.2Nm 3 / (min·t), blowing time is 4min; in the middle and late blowing period, oxygen supply intensity is 4.0Nm 3 / (min·t), bottom blowing hydrogen intensity 0.6Nm 3 / (min·t), blowing time 10min; after the top blowing, the bottom blowing hydrogen is used for stirring to reduce oxygen, and the bottom blowing hydrogen intensity is 0.2Nm 3 / (min·t), blowing time 2min.

[0014] The final molten steel temperature is 1670°C, the final oxygen content is 170 ppm, and the final slag FeO content is 9%. Compared with the original converter smelting, the scrap ratio is increased by 20%, the carbon emission is reduced by 36t, the consumption of aluminum deoxidizer is saved by 160kg, and the burning loss ...

example 2

[0016] A 200t top-bottom double blowing converter is used, the molten iron temperature is 1350℃, the scrap ratio is 45%, and the scrap preheating temperature is 400℃; in the early stage of blowing, the oxygen supply intensity is 4.5Nm 3 / (min t), the bottom blowing hydrogen intensity is 1.4Nm 3 / (min t), blowing time is 5min; in the middle and late blowing period, the oxygen supply intensity is 4.2Nm 3 / (min t), the bottom blowing hydrogen intensity is 0.8Nm 3 / (min·t), blowing time 12min; after the top blowing, the bottom blowing hydrogen is used for stirring to reduce oxygen, and the bottom blowing hydrogen intensity is 0.3Nm 3 / (min·t), blowing time 3min.

[0017] The final molten steel temperature is 1680°C, the final oxygen content is 200 ppm, and the final slag FeO content is 12%. Compared with the original converter smelting, the scrap ratio is increased by 25%, the carbon emission is reduced by 54t, the consumption of aluminum deoxidizer is saved by 290kg, and the b...

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Abstract

The invention provides a method for realizing high scrap ratio smelting in a converter by blowing hydrogen at the bottom, belonging to the field of iron and steel metallurgy. The smelting process of top and bottom double blowing converter adopts top blowing oxygen and bottom blowing hydrogen combined blowing. The blown hydrogen stirs the molten pool, improves the heat and mass transfer effects of the molten pool, and reacts with the oxygen inside and on the surface of the molten pool. Heat is released to melt scrap and replenish molten steel, reducing oxygen content to regulate molten steel and slag peroxidation. The invention proposes a new idea of ​​blowing hydrogen at the bottom of the converter instead of nitrogen or argon at the bottom. The blown hydrogen provides heat to the molten pool through the chemical reaction of hydrogen oxidation while stirring the molten pool, so as to significantly increase the scrap ratio of the converter and reduce the Production costs and carbon emissions without affecting the quality of molten steel.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a method for realizing high scrap ratio smelting in a converter by blowing hydrogen at the bottom. Background technique [0002] With the massive accumulation of social scrap resources and increasingly stringent carbon emission requirements, converter smelting with high scrap ratio has become an important way to improve steelmaking capacity and economic benefits. The technical ideas for improving the scrap ratio of the converter include: reducing the heat loss in the process, increasing the physical heat of the charge and increasing the heat release of the chemical reaction. Based on the above technical ideas, the main measures taken in practice include: ladle capping, scrap preheating, and addition of exothermic agents. The ladle capping operation is simple and effective, but the effect of improving the scrap ratio of the converter is limited; the scrap preh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/35C21C7/06C21C7/072
CPCC21C5/35C21C7/06C21C7/072Y02P10/20
Inventor 何杨刘建华张杰闫柏军邓振强
Owner UNIV OF SCI & TECH BEIJING