Method for controlling electric arc furnace steelmaking end point

A technology of steelmaking end point and control method, which is applied in the field of electric arc furnace steelmaking, can solve the problems of reducing the production efficiency of the electric arc furnace steelmaking process, increasing production costs, and slowing down the pace of smelting, so as to avoid the danger of manual temperature measurement and sampling, Improve the hit rate and speed up the effect of smelting rhythm

Pending Publication Date: 2021-11-05
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This production method requires manual temperature measurement and sampling in front of the furnace, which is not only labor-intensive and dangerous, but also the electrode power supply must be stopped during temperature measurement and sampling, resulting in slower smelting rhythm and higher production costs, which greatly reduces the cost of the electric arc furnace steelmaking process. Productivity

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  • Method for controlling electric arc furnace steelmaking end point
  • Method for controlling electric arc furnace steelmaking end point

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Effect test

Embodiment 1

[0042] The invention is applied in 100-ton electric arc furnace steelmaking. The oxygen lance on the electric arc furnace wall is installed at an angle of 60° to the horizontal plane. It is smelted with a 50% molten iron ratio. The Mach number of the nozzle is 2, the gas flow rate is 2500m3 / h, and the pressure is 0.8MPa. Requirements for tapping at the end of smelting: temperature: 1650°C-1670°C, carbon content: 0.09%-0.11%. The smelting process adopts the electric arc furnace steelmaking end point control mode of smelting end point measurement of molten steel temperature and carbon content and switching of oxygen blowing power supply smelting cycle, which specifically includes the following contents:

[0043] Step 1: 30 minutes after the start of smelting, under the action of the computer control system, the system switches to the smelting end point measurement mode: the gas supply valve group completes the N2 / O2 switching, and the oxygen supply of the 4 electric arc furnace w...

Embodiment 2

[0051]The present invention is applied in 150-ton electric arc furnace steelmaking. The oxygen lance on the electric arc furnace wall is installed at an angle of 60° to the horizontal plane. It is smelted with a 60% molten iron ratio. The Mach number of the nozzle is 2, the gas flow rate is 3000m3 / h, and the pressure is 0.8MPa. Requirements for tapping at the end of smelting: temperature: 1650°C-1670°C, carbon content: 0.13%-0.15%. The smelting process adopts the control mode of electric arc furnace steelmaking end-point control mode in which the carbon content of molten steel at the end of smelting is measured at fixed points, the temperature of molten steel is continuously measured, and the smelting with oxygen blowing and power supply is carried out simultaneously, which specifically includes the following:

[0052] Step 1: 35 minutes after the start of smelting, under the action of the computer control system, the system switches to the smelting end point measurement mode: ...

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Abstract

The embodiment of the invention discloses a method for controlling an electric arc furnace steelmaking end point, and belongs to the technical field of electric arc furnace steelmaking. A computer control system is integrated with a multifunctional injection system, a power supply system, a temperature measurement system and a carbon content detection system, an online measurement mode and an oxygen blowing power supply smelting mode of molten steel temperature and carbon content of electric arc furnace steelmaking are automatically controlled according to molten steel temperature and carbon content data measured on line and smelting process target requirements, the oxygen supply flow, the electrode power supply system and the smelting time in different modes are dynamically adjusted, and the molten steel temperature and the carbon content at the smelting end point are hit at the same time through automatic circulating switching of the online measurement mode and oxygen blowing power supply smelting mode of the molten steel temperature and the carbon content, so that accurate control over the end point in the electric arc furnace steelmaking process is achieved, manual temperature measurement and sampling are avoided, the smelting quality of the electric arc furnace is improved, the smelting time is shortened, the production rhythm is accelerated, the production cost is reduced, and intelligentization of electric arc furnace steelmaking is promoted.

Description

technical field [0001] The invention belongs to the technical field of electric arc furnace steelmaking, and relates to a method for controlling the end point of electric arc furnace steelmaking. Background technique [0002] Electric arc furnace steelmaking and converter steelmaking are the two main methods of steelmaking production in the iron and steel industry. Based on the furnace type structure and relatively simple working conditions of the converter, with the increasingly mature and perfect control technology of temperature measurement and carbon determination of the sub-lance of the converter and the analysis and control technology of the furnace gas, the intelligent steelmaking technology of the converter has been widely used in the converter steelmaking enterprises and Reliable operation. In the field of electric arc furnace steelmaking, due to its special furnace structure and harsh and complex smelting environment, it is difficult to accurately detect the tempe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/52C21C7/068
CPCC21C5/52C21C7/068C21C2005/5288Y02P10/20Y02P10/143
Inventor 魏光升田博涵朱荣冯超董凯杨树峰王美晨刘润藻张宇航李欣张洪金
Owner UNIV OF SCI & TECH BEIJING
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