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Maintenance method for refractory material of electric-arc furnace and system thereof

A refractory material and electric arc furnace technology, applied in the field of refractory material maintenance, can solve the problems of low start-up rate, steel breakout accident, difficult use and management of bottom blowing system, etc., and achieve the effect of saving cost and prolonging service life

Active Publication Date: 2010-05-12
ZHANGJIAGANG POHANG STAINLESS STEEL
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the stainless steel smelting process of electric arc furnace, the use and management of the bottom blowing system are relatively difficult. Most of the bottom blowing systems currently in use have low start-up rates due to difficult management and ineffective effects.
Moreover, there is currently no disclosure about how to perform refractory maintenance and management on the bottom blowing system of the electric arc furnace in stainless steel smelting.
Moreover, in the smelting process, there is no good way to timely understand and detect the consumption of refractories inside the electric arc furnace, which is a potential threat to the electric arc furnace
When refractory materials are excessively consumed during the smelting process, steel breakout accidents are likely to occur without any warning, which is a great threat to smelting operations, especially the personal safety of operators

Method used

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  • Maintenance method for refractory material of electric-arc furnace and system thereof
  • Maintenance method for refractory material of electric-arc furnace and system thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1 Refractory maintenance system

[0035] This embodiment provides a maintenance system for refractory materials. The maintenance system is used for a large-scale electric arc furnace with a capacity of 140 tons. Three bottom blowing ports (that is, including three groups of seat bricks) are arranged in the bottom blowing system of the electric arc furnace. . The length of the breathable brick used in the bottom blowing part of the bottom blowing system is 750mm, the permanent layer of the electric furnace bottom is bricklaying, 4 layers totaling 260mm, the working layer is dolomite ramming material, the total consumption is 65 tons, and the thickness is 450- 500mm.

[0036] The maintenance system provided in this embodiment includes a temperature detection unit, a temperature judgment unit and a maintenance control unit. Among them:

[0037] The temperature detection unit includes 3 temperature detection devices, which are respectively used to detect the tempe...

Embodiment 2

[0040] Example 2 Refractory maintenance method

[0041] This embodiment provides a refractory maintenance method, which is based on the specific maintenance method of the refractory maintenance system provided in Example 1. The method includes:

[0042] 1. Obtain the temperature detected by thermocouples 1-10 and A-C;

[0043] 2. Before the smelting operation, compare and judge the above-mentioned detected temperature with the first predetermined temperature and the second predetermined temperature: when the temperature detected by numbers 1-10 reaches 400°C (the first predetermined temperature) or A-C detects When the temperature reaches 600°C (the second preset temperature), the working layer of the furnace bottom is about 200-250mm remaining, and the display device of the temperature judging unit displays a yellow alarm, and sends a signal to the maintenance control unit, and then the maintenance control unit controls the maintenance control unit. Wash the electric arc fu...

Embodiment 3

[0048] This embodiment is a specific example of the refractory maintenance system and method provided in Embodiment 1 and Embodiment 2.

[0049] Before the electric arc furnace was charged, the temperature inside the bottom blowing system measured by No. B thermocouple was 603°C, which reached the warranty standard. 16 tons of dolomite refractory ramming materials were put into the refractory maintenance operation, and then the smelting operation was carried out. In the smelting operation, the total load is 130 tons, which is divided into two loads, of which the waste stainless steel ratio is about 25% (based on the total load), carbon steel is about 43 tons, ferrochrome is about 31 tons, and nickel-chromium pig iron is about 20%. Tons, about 4.5 tons of pure nickel, 316L smelted steel, general operations: about 89 tons of primary charging, the actual flow rate of bottom blowing is 60NL / min, about 4536Kg of lime, 22041KWh of electricity, and 25 minutes of operation time; second...

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Abstract

The invention relates to a maintenance method for refractory material of electric-arc furnaces and a system thereof.. The maintenance method comprises the steps of measuring temperature of the bottom of the electric-arc furnace, temperature around a brick cup of a bottom-blowing system and / or temperature of the interior of the bottom-blowing system; before smelting, maintaining the refractory material when the temperature of the bottom of the electric-arc furnace or the temperature around the brick cup of the bottom-blowing system is higher than or equal to the first preset temperature, or the temperature of the interior of the bottom-blowing system is higher than or equal to the second preset temperature; and in smelting process, stopping the smelting work or changing furnace bodies when the temperature of the bottom of the electric-arc furnace or the temperature around the brick cup of the bottom-blowing system is higher than or equal to the third preset temperature, or the temperature of the interior of the bottom-blowing system is higher than or equal to the fourth preset temperature. The maintenance system comprises a temperature measuring unit, a temperature judging unit and a maintenance control unit. With the maintenance method and the system, the maintenance of the refractory material can be carried out in time so as to better perform the regulation effect of the refractory material and effectively save smelting cost.

Description

technical field [0001] The invention relates to a method and system for maintaining refractory materials, in particular to a method and system for maintaining refractory materials in an electric arc furnace. Background technique [0002] The main disadvantage of ordinary electric arc furnace smelting stainless steel is the low stirring capacity of the molten pool, which leads to slow melting of scrap steel and alloy materials, incomplete reaction of slag and molten steel, long smelting time, and high energy consumption. The bottom blowing of the electric arc furnace is to install the gas supply element at the bottom of the furnace and blow in the inert gas to strengthen the stirring of the molten pool and improve the dynamic conditions of the molten pool, which can reduce power consumption, reduce the consumption of ferroalloy and electrodes, shorten the smelting time, and improve decarburization Efficiency, improve metal yield, have good economic effect. [0003] In the el...

Claims

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Application Information

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IPC IPC(8): F27B3/10F27D1/16
Inventor 金将杰蔡博申忠容
Owner ZHANGJIAGANG POHANG STAINLESS STEEL
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