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Bottom blowing oxygen converter smelting process control method based on molten steel continuous temperature measurement

A technology of oxygen converter and smelting process, which is applied in the manufacture of converters, etc. It can solve the problems of molten steel temperature, composition prediction, unstable accuracy, and delayed response state of measurement data, so as to reduce the consumption of steel materials, increase the double hit rate, The effect of improving the dephosphorization effect

Active Publication Date: 2018-08-03
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the high blowing intensity of the bottom-blown oxygen converter, the strong stirring of the molten pool, and the violent reaction in the furnace, it is difficult to accurately predict the temperature and composition of molten steel in actual production, and to implement effective smelting process control. The temperature or molten steel composition does not meet the requirements
[0004] Furnace gas analysis technology is commonly used to monitor the smelting process at present, but this technology indirectly predicts the state of molten steel in the furnace through the furnace gas flow rate and furnace gas composition, and the accuracy is unstable; the furnace gas collection device is installed on the furnace gas processing pipeline , prone to blockage and damage, and the measurement data lags behind the real-time reaction state in the furnace

Method used

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  • Bottom blowing oxygen converter smelting process control method based on molten steel continuous temperature measurement
  • Bottom blowing oxygen converter smelting process control method based on molten steel continuous temperature measurement

Examples

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Embodiment 1

[0043] This embodiment is applied to a 100-ton bottom-blown oxygen converter. The bottom of the bottom-blown oxygen converter is equipped with 1 temperature-measuring lance and 4 bottom-blown lances. Arranged symmetrically on both sides of the trunnion centerline. The temperature measuring gas used by the temperature measuring spray gun is O 2 -N 2 -Ar mixed gas, the gas supply strength of the bottom blowing gun is 0.8Nm 3 / t / min, powder supply intensity is 2~4kg / t / min. The dephosphorization lower limit temperature set by the converter is 1350°C, the dephosphorization upper limit temperature is 1400°C, and the end point pre-control temperature is 50°C lower than the tapping target temperature.

[0044] After adopting the control method of the present invention, the double hit rate of the end point temperature and carbon content reaches 99.6%, and the phosphorus content of the end point molten steel is stably controlled within 80ppm, and the steel material consumption of the...

Embodiment 2

[0046] This embodiment is applied to a 300-ton bottom-blown oxygen converter. The bottom of the bottom-blown oxygen converter is equipped with 1 temperature-measuring lance and 8 bottom-blown lances. Arranged symmetrically on both sides of the trunnion centerline. The temperature measuring gas used by the temperature measuring spray gun is O 2 -CO 2 Mixed gas, the gas supply strength of the bottom blowing spray gun is 1.0Nm 3 / t / min, the powder supply intensity is 2.5~5kg / t / min. The dephosphorization lower limit temperature set by the converter is 1360°C, the dephosphorization upper limit temperature is 1390°C, and the end point pre-control temperature is 30°C lower than the tapping target temperature.

[0047] After adopting the control method of the present invention, the double hit rate of the end point temperature and carbon content reaches 99.2%, and the phosphorus content of the end point molten steel is stably controlled within 75ppm, and the steel material consumpti...

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Abstract

The invention relates to the field of bottom blowing oxygen converter steelmaking, and provides a bottom blowing oxygen converter smelting process control method based on molten steel continuous temperature measurement. A temperature measurement spraying gun is installed at the furnace bottom of a bottom blowing oxygen converter to measure the temperature of molten steel in the converter, molten steel ingredients are forecasted in real time according to the molten steel temperature and the converter blowing and feeding conditions, staged control over the smelting process of the bottom blowingoxygen converter is carried out based on the molten steel temperature, the spraying parameters of the bottom blowing spraying gun are dynamically adjusted, and optimum control and double hitting of the final molten steel temperature and the carbon content in the smelting process are achieved. A new method is provided for the process and the terminal control of the bottom blowing oxygen converter,the double hitting rate of the final molten steel temperature and the carbon content is improved by 10%, the final molten steel phosphorus content can be stably controlled within 80 ppm, and consumedsteel is reduced by 10 kg / t.

Description

technical field [0001] The invention relates to the field of bottom-blown oxygen converter steelmaking, in particular to a bottom-blown oxygen converter smelting process control method based on continuous temperature measurement of molten steel. Background technique [0002] The bottom-blown oxygen converter has the ability to blow oxygen and solid powder, which significantly improves the kinetic conditions of the metallurgical reaction in the furnace. The slag-steel reaction is close to the equilibrium state, and can decarburize under the condition that the slag (FeO) basically does not increase. In addition to the low-carbon field, at the same time, the bottom blowing powder can efficiently remove impurity elements such as phosphorus and sulfur in molten iron, and can produce low-carbon high-quality steel with high efficiency and low cost. [0003] Due to the strong bottom blowing intensity of the bottom-blown oxygen converter, the strong stirring of the molten pool, and t...

Claims

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Application Information

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IPC IPC(8): C21C5/34C21C5/46
CPCC21C5/34C21C5/4673
Inventor 朱荣胡绍岩董凯刘润藻刘福海李伟峰姚柳洁周赟武文合朱长富
Owner UNIV OF SCI & TECH BEIJING
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