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Direct current electric arc furnace bottom electrode structure and application thereof

A technology of DC electric arc furnace and bottom electrode, which is applied in electric furnace, electric furnace heating, furnace and other directions, can solve the problems of inability to guarantee the normal operation of DC electric furnace, low service life of bottom electrode, fast electrode loss and so on.

Inactive Publication Date: 2016-11-09
上海彭浦特种耐火材料厂有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This structure has the following disadvantages: a) The current is only concentrated in the center of the furnace bottom, which causes the center of the furnace bottom to overheat and the molten steel to flow rapidly, and the electrode part of the furnace bottom cannot be hot repaired, so the service life of the bottom electrode is relatively low, generally only 500~ 1500 heats
This cannot be used as an electrode material, or it cannot guarantee the normal operation of the DC electric furnace at all, or even cannot operate; 3) In the case where the bulk material composed of magnesia carbon brick, magnesia and graphite cannot operate, it is either non-conductive or weak Conductivity and may be broken down at any time, causing the graphite block to be exposed to the molten steel, which will quickly dissolve the graphite block into the molten steel, resulting in the formation of a large pit under the electrode, the furnace bottom temperature is too high, and safety accidents may occur Appear at any time; 4) Whether there is a strong static fit between the graphite block and the metal rod, coupled with the large difference in thermal expansion between the two, this may lead to a large interface resistance, which will cause the bottom of the furnace to heat up and cause the electrode to wear out too quickly , very short service life
In short, such DC arc furnace bottom anode either cannot work, or even if it can work, it may lead to excessive consumption of the bottom anode, high furnace bottom temperature and short service life

Method used

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  • Direct current electric arc furnace bottom electrode structure and application thereof

Examples

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Effect test

Embodiment 1

[0036]For a 10t needle-type DC arc furnace, after the metal anode steel needle is installed, ram the dry-type magnesium-calcium ramming material 6 with a thickness of 350mm. Special vibrating and ramming equipment should be used for ramming construction. Then add magnesia carbonaceous conductive ramming material 7 for construction, the overlapping thickness of magnesia carbonaceous conductive ramming material and steel needle is 300mm, and then ram the conductive magnesia carbonaceous ramming material 50mm thick above the steel needle. The ramming construction method is the same as that of dry magnesium-calcium ramming material. Be sure to hit the dense. This is important not only for corrosion resistance but also for electrical conductivity. Then build the magnesia-carbon brick furnace lining, and then ram the periphery and slope of the electric furnace with dry magnesia-calcium ramming material. In this way, steelmaking raw materials can be added and electricity can be su...

Embodiment 2

[0038] After the metal anode steel sheet is installed, dry-type magnesium-calcium ramming material 6 with a thickness of 400mm is rammed. It is worth pointing out that, in order to achieve densification, the thickness of each feeding should not be greater than 100mm, and special vibrating ramming equipment should be used for ramming. Hit construction. Then add magnesium carbonaceous conductive ramming material 7 for construction, the overlapping thickness of magnesium carbonaceous conductive ramming material and steel sheet is 200mm, and ramming magnesium carbonaceous ramming material 200mm thick on the steel sheet. The ramming construction method is the same as that of dry magnesium-calcium ramming material. Be sure to hit the dense. This is important not only for corrosion resistance but also for electrical conductivity. Then build the magnesia-carbon brick furnace lining, and then ram the periphery and slope of the electric furnace with dry magnesia-calcium ramming materi...

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Abstract

The invention relates to a direct current electric arc furnace bottom electrode structure. A bottom electrode structure is a composite bottom anode structure. The bottom electrode structure comprises a plurality of metal conduction elements vertically installed at the furnace bottom at intervals. The intervals between the metal conduction elements are filled with fireproof materials. The lower portions of the intervals are filled with non-conduction fireproof materials. The upper portions of the intervals are filled with first conduction fireproof materials. A layer of second conduction fireproof material is laid on the top of each metal conduction element. The second conduction fireproof materials are used for heat repairing. The invention further relates to application of the direct current electric arc furnace bottom electrode structure. By adoption of the conduction fireproof materials, a metal bottom anode is changed into a composite bottom anode in which metal and the conduction fireproof materials are combined, a metal bottom anode which cannot be repaired is changed into a bottom anode capable of being subjected to cold state repairing and heat state repairing, and therefore the service life of the bottom anode is greatly prolonged, the operation rate of steelmaking of an electric furnace is increased, the steelmaking cost is reduced, and the equipment utilization rate is increased.

Description

technical field [0001] The invention relates to the technical field of a DC electric arc furnace, in particular to a DC electric arc furnace bottom anode, in particular to a DC electric arc furnace bottom electrode structure and its application. Background technique [0002] So far, there are four types of DC arc furnaces: [0003] (1) ABB type: The entire bottom of the furnace is built with conductive magnesia-carbon materials. This structure has the following undesirable results: a) Its ideal state is that the current is evenly distributed at the bottom of the furnace, but in fact this is difficult to achieve. In the process of construction and use, especially after hot repair, it is difficult to achieve uniform thickness and consistent density of the furnace bottom. In addition, the current has the characteristics of a low-resistance channel, so the current density distribution at the bottom of the electric furnace is uneven. In the center of the furnace bottom (right ...

Claims

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Application Information

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IPC IPC(8): F27B3/20F27D11/10C21C5/52
CPCC21C5/5229C21C2005/5235F27B3/20F27D11/10F27M2001/02Y02P10/20
Inventor 田守信蓝振华柯美亚赵玲娣王礼玮
Owner 上海彭浦特种耐火材料厂有限公司
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