Multi-point direct grounding device for ultra-high power electric arc furnace

Abstract

This utility model discloses a multi-point direct grounding device for an ultra-high power electric arc furnace, comprising a first grounding wire (1), a second grounding wire (2), a third grounding wire (3), a fourth grounding wire (4), and a fifth grounding wire (5). The first grounding wire (1) is electrically connected to the EBT tap hole of the furnace cover; the second grounding wire (2) is electrically connected to the furnace door (3); the third grounding wire (3) is electrically connected to the water cooling tank of the electric arc furnace connecting trolley; the fourth grounding wire (4) is electrically connected to the driver (5) of the connecting trolley; and the fifth grounding wire (5) is electrically connected to the furnace shell (6) of the electric arc furnace. This utility model is the first to apply a multi-point direct grounding method in an ultra-high power electric arc furnace, which is not only an innovation of traditional grounding protection technology, but also a powerful exploration of the safe, efficient, and sustainable development path of the electric arc furnace industry in the future.

Description

Technical Field

[0001] This utility model relates to a multi-point direct grounding device for an ultra-high power electric arc furnace, belonging to the field of metallurgical technology. Background Technology

[0002] Commonly used grounding methods for electric arc furnaces in China include single-point grounding, multi-point grounding, and mesh grounding. Each method has its advantages and disadvantages. For example, single-point grounding is simple but its grounding effect may not be ideal, while multi-point grounding and mesh grounding provide better grounding effects, but their installation and maintenance are relatively complex. Common electric arc furnace grounding protection typically involves setting up nine grounding points using a multi-point grounding method. The grounding material is 50mm flat steel, and the grounding points are located at points such as the support rollers, cradle, rotating trolley, connecting trolley, and tilting cylinder. This indirect grounding method with multiple grounding points cannot quickly eliminate the induced current during the operation of the electric arc furnace because the furnace shell and furnace cover, which directly bear the impact of the current, need to conduct the current through equipment such as rollers and rocking frames. In addition, the resistance value of the grounding flat steel is relatively large. Therefore, it is not effective in preventing the leakage of smelting current during operation. Faults such as the breakdown of KT gun water cooling sleeve, furnace cover, and furnace shell, and damage to the cooling water pipes of KT gun, furnace cover, and furnace shell are common. These faults cause a high number of equipment shutdowns due to heat, which disrupts the production rhythm and poses a great threat to safe production. According to the heat shutdown statistics of a steel plant in 2022, the steel plant experienced a total of 2,622 minutes of equipment shutdowns due to the breakdown of KT gun, furnace cover, and furnace shell, and water leakage of furnace cover and furnace shell auxiliary equipment throughout the year. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a multi-point direct grounding device for an ultra-high power electric arc furnace, which can significantly reduce water leakage caused by the breakdown of key components such as KT gun, furnace cover and furnace shell, thereby drastically reducing the thermal shutdown rate caused by equipment failure, thus improving production efficiency and reducing maintenance costs.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A multi-point direct grounding device for an ultra-high power electric arc furnace includes a first grounding wire, a second grounding wire, a third grounding wire, a fourth grounding wire, and a fifth grounding wire. The first grounding wire is electrically connected to the EBT (Exit Port) of the furnace cover of the electric arc furnace; the second grounding wire is electrically connected to the furnace door; the third grounding wire is electrically connected to the water cooling tank of the electric arc furnace connecting trolley; the fourth grounding wire is electrically connected to the driver of the connecting trolley; and the fifth grounding wire is electrically connected to the furnace shell of the electric arc furnace.

[0005] As a preferred embodiment, the first, second, third, fourth, and fifth grounding wires are all made of 185 square millimeter copper cable capable of carrying a maximum overload current of over 1000 amps.

[0006] Beneficial Effects: Compared with existing technologies, this invention combines direct grounding with multi-point grounding, achieving a leapfrog upgrade from indirect grounding to direct grounding. By adopting a multi-point distributed layout strategy, new direct grounding points are added to the furnace cover, connecting trolley, and furnace shell, forming a mesh grounding system. This further improves the overall grounding effect of the electric arc furnace, significantly reducing water leakage caused by the breakdown of key components such as the KT gun, furnace cover, and furnace shell. This results in a dramatic decrease in the thermal shutdown rate caused by equipment failure, with a reduction of up to 53%, demonstrating significant economic benefits. Furthermore, the use of high-specification 185 square millimeter copper cables as grounding wires ensures the stable and reliable operation of the grounding network due to their excellent conductivity and load-bearing capacity (capable of carrying over 1000 amps of overload current). This invention is the first to apply multi-point direct grounding in an ultra-high power electric arc furnace, representing not only an innovation in traditional grounding protection technology but also a powerful exploration of a safe, efficient, and sustainable development path for the future electric arc furnace industry. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the grounding structure of an existing electric arc furnace.

[0008] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Detailed Implementation

[0009] Example 1: As Figure 1 As shown, a multi-point direct grounding device for an ultra-high power electric arc furnace includes a first grounding wire 1, a second grounding wire 2, a third grounding wire 3, a fourth grounding wire 4, and a fifth grounding wire 5. The first grounding wire 1 is electrically connected to the EBT tap hole of the electric arc furnace cover; the second grounding wire 2 is electrically connected to the furnace door 3; the third grounding wire 3 is electrically connected to the water cooling tank of the electric arc furnace connecting trolley; the fourth grounding wire 4 is electrically connected to the driver 5 of the connecting trolley; and the fifth grounding wire 5 is electrically connected to the furnace shell 6 of the electric arc furnace.

[0010] Existing electric arc furnace grounding structures, such as Figure 2 As shown, there are a total of 9 grounding protection points, using a multi-point grounding method. The grounding material is 50 flat steel. The grounding points of the equipment are located at the rollers, rocker arm, rotating trolley, connecting trolley, tilting cylinder, etc.

[0011] The innovation of this utility model lies in the addition of five direct grounding points to key components of the electric arc furnace: the furnace cover, the connecting trolley, and the furnace shell. Specifically, for the furnace cover, two grounding points are added above the EBT tapping port and the furnace door. These two locations are precisely where induced current and smelting current are concentrated; direct grounding allows the current to be quickly conducted to the ground, preventing it from accumulating inside the furnace cover. One grounding point is also added to the water cooling tank and the drive unit of the connecting trolley, effectively preventing damage to the equipment and water cooling system caused by improper current conduction. For the furnace shell, grounding points are added to vulnerable areas, such as three direct grounding points for the three sets of furnace wall guns and one direct grounding point on the upper part of the furnace shell, forming a comprehensive protection network to ensure timely current elimination.

[0012] To further improve the grounding effect, the first grounding wire 1, the second grounding wire 2, the third grounding wire 3, the fourth grounding wire 4, and the fifth grounding wire 5 are all made of high-specification 185 square millimeter copper cable as grounding wire. Its excellent conductivity and carrying capacity (can carry a maximum overload current of more than 1,000 amps) ensure that the grounding grid can work stably and reliably.

[0013] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model's technical solution, and all such modifications or alterations shall still fall within the scope of the present utility model's technical solution.

Claims

1. A multi-point direct grounding device for an ultra-high power electric arc furnace, characterized in that: It includes a first grounding wire (1), a second grounding wire (2), a third grounding wire (3), a fourth grounding wire (4), and a fifth grounding wire (5). The first grounding wire (1) is electrically connected to the EBT tapping port of the electric arc furnace cover, the second grounding wire (2) is electrically connected to the furnace door, the third grounding wire (3) is electrically connected to the water cooling tank of the electric arc furnace connecting trolley, the fourth grounding wire (4) is electrically connected to the driver of the connecting trolley, and the fifth grounding wire (5) is electrically connected to the furnace shell of the electric arc furnace.

2. The multi-point direct grounding device for the ultra-high power electric arc furnace according to claim 1, characterized in that: The first grounding wire (1), the second grounding wire (2), the third grounding wire (3), the fourth grounding wire (4), and the fifth grounding wire (5) are all made of 185 square millimeter copper cable that can carry a maximum overload current of more than 1000 amps.

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