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Method for continuously measuring carbon content of molten steel in electric steelmaking furnace

An electric furnace steelmaking and measurement method technology, applied in the field of metallurgical steelmaking, can solve the problems of large errors in molten steel carbon content, affecting the consumption of raw and auxiliary materials, and affecting the production of electric furnace steelmaking, so as to improve production efficiency, save samplers, The effect of prolonging the life of the refractory material in the furnace

Active Publication Date: 2009-12-02
SHAGANG GROUP
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

At present, one of the main methods for carbon determination of molten steel in electric furnace steelmaking is to take samples of molten steel in the furnace, send them to the laboratory to analyze the samples with special equipment, and measure the content of various elements including carbon in the samples. This method requires manual labor. Sampling, sample delivery, sample preparation, analysis, data network transmission and other processes need to wait for a long time, which affects the production of electric furnace steelmaking and the consumption of raw and auxiliary materials, and the measured carbon content of molten steel has a large error
[0004] Another existing method for determining the carbon content of molten steel is to use a carbon-fixing and oxygen-fixing lance system. After the carbon-fixing and oxygen-fixing gun is equipped with a carbon-fixing and oxygen-fixing head, it is directly inserted into the electric furnace for sampling and analysis. The analysis speed is relatively fast, but It is only suitable for the case of high oxygen content in molten steel, and it cannot be measured when the carbon content is high, and it is easy to wear and tear, difficult to use, and high cost

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  • Method for continuously measuring carbon content of molten steel in electric steelmaking furnace

Examples

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Effect test

Embodiment 1

[0063] Example 1: 90T electric furnace steelmaking production in the first workshop of Runzhong Steelworks of Shagang Group, furnace number 2348 in 2009, steel type C70DA, carbon content of the melted sample is 0.82%, oxygen consumption of the side wall oxygen lance when the melted sample is taken The oxygen consumption of the furnace door oxygen lance is 831 cubic meters, the natural gas consumption of the side wall oxygen lance is 291 cubic meters, and the oxygen consumption of the side wall oxygen lance is 2003 cubic meters when the second sample is also the terminal sample. The oxygen consumption of the furnace door oxygen lance is 921 cubic meters, the natural gas consumption of the side wall oxygen lance is 313 cubic meters, the actual carbon content of the second sample is 0.61%, and the calculated value calculated by this method is 0.63%;

Embodiment 2

[0064] Example 2: 90T electric furnace steelmaking production in the first workshop of Runzhong Steelworks of Shagang Group, furnace number 2351 in 2009, steel type C70DA, carbon content of the molten sample is 1.15%, oxygen consumption of the side wall oxygen lance when the molten sample is taken The oxygen consumption of the furnace door oxygen lance is 1123 cubic meters, the natural gas consumption of the side wall oxygen lance is 300 cubic meters, the oxygen consumption of the side wall oxygen lance is 2332 cubic meters when the second sample is taken, and the furnace door oxygen consumption The oxygen consumption of the lance is 1260 cubic meters, the natural gas consumption of the sidewall oxygen lance is 326 cubic meters, the actual carbon content value of the second sample is 0.83%, and the calculated value obtained by this method is 0.84%; the third sample is also The oxygen consumption of the side wall oxygen lance is 2516 cubic meters, the oxygen consumption of the f...

Embodiment 3

[0065] Example 3: 90T electric furnace steelmaking production in the first workshop of Runzhong Steelworks of Shagang Group, furnace number 2382 in 2009, steel type C80DA, the carbon content of the melted sample is 1.02%, and the oxygen consumption of the side wall oxygen lance when the melted sample is taken The oxygen consumption of the furnace door oxygen lance is 1070 cubic meters, the natural gas consumption of the side wall oxygen lance is 334 cubic meters, and the oxygen consumption of the side wall oxygen lance is 2232 cubic meters when the second sample is also the terminal sample. The oxygen consumption of the furnace door oxygen lance is 1231 cubic meters, the natural gas consumption of the side wall oxygen lance is 367 cubic meters, the actual carbon content of the second sample is 0.66%, and the calculated value obtained by this method is 0.66%;

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Abstract

The invention discloses a method for continuously measuring carbon content of molten steel in an electric steelmaking furnace and belongs to the technical field of metallurgical steelmaking. The method utilizes a common gas flowmeter, a programmable controller (PLC) and a computer system to measure relevant parameter values for calculating the carbon content, carries out the continuous calculation on the carbon content of the molten steel through a mathematical model, continuously displays the current carbon content of the molten steel in a user interface and carbon contents of other samples after a melting down sample is obtained by calculation and other relevant parameters so as to realize real-time online forecasting of the carbon content of the molten steel. The invention relates to asimple service method and is not influenced by furnace capacity, material situation, configuration of decarbonization equipment and has high forecasting precision of the carbon content of the molten steel; and the method makes a judgment on the current carbon content of the molten steel in the electric steelmaking furnace with high accuracy, saves the steelmaking time and improves the production efficiency of steelmaking.

Description

technical field [0001] The invention relates to an electric furnace steelmaking technology, in particular, continuously calculates and measures the carbon content of molten steel during the smelting process by using consumption parameters of gas media such as oxygen and natural gas necessary for steelmaking in a furnace, and belongs to the technical field of metallurgical steelmaking. Background technique [0002] Electric furnace, also known as electric arc furnace, is the first process of short-process steelmaking. In the process of electric furnace steelmaking, the raw materials such as molten iron and steel scrap added to the furnace are heated up by electrification, and the furnace door oxygen lance and multiple side wall oxygen lances are used to continuously blow oxygen and natural gas to raise the temperature and continuously reduce the temperature of the raw materials. The process of carbon and other element content. In the process of electric furnace steelmaking, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/20G01N35/00
Inventor 周智民高永生李增伟潘永龙
Owner SHAGANG GROUP
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