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A kind of maintenance method and system of electric arc furnace refractory material

A refractory material and electric arc furnace technology, applied in the field of refractory material maintenance, can solve problems such as low start-up rate, steel breakout accidents, threats to personal safety of operators, etc., and achieve the effect of saving costs and prolonging service life

Active Publication Date: 2011-12-21
ZHANGJIAGANG POHANG STAINLESS STEEL
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  • Summary
  • Abstract
  • 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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  • A kind of maintenance method and system of electric arc furnace refractory material
  • A kind of maintenance method and system of electric arc furnace refractory material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1 Refractory maintenance system

[0035] This embodiment provides a refractory curing system, which is used in a large electric arc furnace with a capacity of 140 tons. The bottom blowing system of the electric arc furnace is provided with three bottom blowing ports (that is, including three sets of bricks) . The bottom blowing part of the bottom blowing system uses a breathable brick length of 750mm, the permanent layer of the electric furnace bottom is bricklaying, 4 layers total 260mm, the working layer is dolomite ramming material, the total amount 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 three temperature detection devices, which are used to detect the temperature of the bottom of the electric arc furnace, the temperature around the base br...

Embodiment 2

[0040] Example 2 Refractory maintenance method

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

[0042] 1. Get the temperature detected by thermocouples No. 1-10 and No. A-C;

[0043] 2. Before the smelting operation, compare the above-mentioned detected temperature with the first predetermined temperature and the second predetermined temperature respectively and judge: when the temperature detected from 1-10 reaches 400℃ (the first predetermined temperature) or AC number is detected When the temperature reaches 600°C (the second predetermined temperature), the remaining working layer of the furnace bottom is about 200-250mm, the display device of the temperature judgment unit displays a yellow alarm, and sends a signal to the maintenance control unit, and then the maintenance control unit controls the The electric arc furnace performs furnace washi...

Embodiment 3

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

[0049] Before charging the electric arc furnace, the No. B thermocouple measured the internal temperature of the bottom blowing system to be 603℃, which reached the warranty standard. 16 tons of dolomite refractory ramming materials were put into refractory maintenance operations, and then smelting operations. In the smelting operation, the total loading capacity is 130 tons, divided into two loadings, of which the scrap stainless steel ratio is about 25% (based on the total loading capacity), 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 smelting steel, general operations: a charge of about 89 tons, the actual flow rate of bottom blowing is 60NL / min, the use of lime is about 4536Kg, the electricity is 22041KWh, the operation time is 25 minutes; th...

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Abstract

The invention relates to a maintenance method and system for electric arc furnace refractory materials. The above method includes the following steps: detecting the temperature of the bottom of the electric arc furnace, the temperature around the bottom blowing system block and / or the temperature inside the bottom blowing system; before the smelting operation, when the temperature of the electric arc furnace bottom or the bottom blowing system block When the surrounding temperature is greater than or equal to the first predetermined temperature, or the temperature inside the bottom blowing system is greater than or equal to the second predetermined temperature, the refractory maintenance operation is carried out; during the smelting process, when the temperature of the bottom of the electric arc furnace or the bottom blowing system seat When the temperature around the brick is greater than or equal to the third predetermined temperature, or the temperature inside the bottom blowing system is greater than or equal to the fourth predetermined temperature, the smelting operation is stopped and the furnace body is replaced. The maintenance system above includes: a temperature detection unit, a temperature judgment unit and a maintenance control unit. By adopting the above method and system, the maintenance of the refractory material can be carried out in time, the regulating function of the refractory material can be better played, and the smelting cost can be effectively saved.

Description

Technical field [0001] The invention relates to a method and system for curing refractory materials, in particular to a method and system for curing 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 a gas supply element at the bottom of the furnace and blow inert gas to strengthen the stirring of the molten pool, improve the dynamic conditions of the molten pool, reduce power consumption, reduce the consumption of ferroalloys and electrodes, shorten the smelting time, and improve decarburization Efficiency, increase the metal yield, and have a good economic effect. [0003] In an electric arc furnace, the furna...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F27B3/10F27D1/16
Inventor 金将杰蔡博申忠容
Owner ZHANGJIAGANG POHANG STAINLESS STEEL