KR101662189B1 - Antioxidant Device for preventing oxidation of electrode and Electric furnace having the same - Google Patents

Abstract

The present invention relates to an antioxidant, And a pipe connected to the oxidation preventing part, wherein the gas transferred through the pipe surrounds the electrode by being filled in a space separated between the electrode and the oxidation preventing part, And an electric furnace having the same. Accordingly, the gas is sprayed to surround the electrode when the electrode is waiting for operation, thereby preventing the electrode from being oxidized and preventing deterioration of the peripheral equipment.

Description

[0001] The present invention relates to an electrode oxidation preventing device and an electric furnace having the electrode oxidation preventing device,

The present invention relates to an electrode oxidation preventing device and an electric furnace having the same. More particularly, the present invention relates to an apparatus for preventing oxidation of an electrode and an electric furnace having the electrode oxidation preventing apparatus capable of preventing a facility from being deteriorated due to an elevation of a unit level due to electrode natural oxidation and a high temperature in a working waiting time of an electrode in an electric furnace working process.

The work process using an electric furnace is a steelmaking process that refines a steel source such as scrap with electric energy and then refines it to the target component and temperature. Since it does not need a blast furnace, raw material disposal facility and sintering facility compared to the conversion steelmaking method, And can be applied to stainless steels and special steels capable of producing small quantities of various products, as well as carbon steels. In addition, carbon dioxide emissions, which are greenhouse gases during the steelmaking process, are very low to one-fourth of the blast furnace, and are recognized as future steel technologies in that they are environmentally friendly facilities that can eliminate scrap .

Here, the electric furnace refers to a furnace that heats and melts a metal or an alloy by using electric energy. The furnace charges the scrap into the furnace and generates an arc current between the electrode and the scrap to dissolve the scrap. do.

In connection with the method of manufacturing molten steel using the electric furnace, there is a 'fixed electric furnace and a molten steel manufacturing method' of the present applicant's Korean Patent No. 10-1406503 (2014.06.13).

Referring to FIG. 1, in a conventional work process using an electric furnace, a power source for electric furnace arcing is supplied and an arc is generated with a scrap. 50 and the scrap, the electrode 50, which is a carbon rod, rises to several thousand degrees.

1, reference numeral 10 denotes an electric transformer, 20 denotes a secondary bus, 30 denotes a water-cooled cable, 40 denotes an electrode arm, 50 denotes an electrode, 60 denotes an electrode holder, 70 denotes a loop, 80 denotes an electric furnace, 90 designates a lifting device.

When the process waiting time occurs, the loop 70 of the electric furnace 80 is opened (opened) as shown in FIG. 2, The electrode 50 is moved to the standby position, and then, the operation waits until the work process is performed. 2, reference numeral 91 denotes an electrode lifting device for lifting the electrode arm 40, and the electrode lifting device 91 lifts and retracts the electrode 50 with respect to the loop 70. [

2, in the work process using the electric furnace, when the arcing operation is completed at the work position, the loop 70 is rotated from the work position to the standby position to wait for work. As a result, an electric furnace process latency occurs.

At this time, the lifting device 90 is used to raise the loop 70 to the top position by using the electrode lifting device 91 to rotate the loop 70 and then to place the electrode 50 in the standby position. ) To rotate the loop 70.

The electrode 50, which has been heated up to a few thousand degrees with the arc heat of the scrap, is naturally produced in the working atmosphere.

Accordingly, the natural oxidation of the electrode 50 occurring in the standby state causes a problem of rising the electrode unit level, and the electrode 50 located at the standby position deteriorates the peripheral equipment.

In order to solve this problem, the operator can take out the electrode 50 and transport it to the electrode storage place to prevent natural oxidation when a long-term atmosphere is generated.

However, as shown in FIG. 1 and FIG. 2, when the electrode 50 of three phases is drawn out and then the electrode 50 is mounted again, a lot of operation time is required. And it is impossible to re-install it.

Here, as shown in Fig. 3, the electrode 50 moves between a working position for performing the melting operation process using the electrode 50 and a standby position for waiting before performing the melting process.

That is, the electrode 50 rotates about the loop lifting device 90 and moves between the working position and the standby position.

Taken together, in the case of a conventional work process using an electric furnace, the electrode 50 raised to several thousand degrees due to arc heat is naturally produced in the atmosphere.

In particular, when the electrode 50 is exposed to the outside for a long time with the loop 70 being opened, deterioration due to the high temperature of the peripheral equipment is caused by the natural oxidation of the electrode 50, Is generated.

That is, in the case of a conventional working process using electricity, there is a problem that a failure due to the increase in the production cost due to the natural oxidation of the electrode and the deterioration of the equipment around the electrode 50 in the waiting time of the electrode 50 is continuously generated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a method of manufacturing an electrode, which is capable of preventing the deterioration of peripheral equipment due to high cost, And an electric furnace having the same.

According to a preferred embodiment of the present invention, the above object can be attained by an antioxidant unit having an electrode inserted therein; And a pipe connected to the oxidation preventing part, wherein the gas transferred through the pipe surrounds the electrode by being filled in a space separated between the electrode and the oxidation preventing part, .

Here, the gas may be nitrogen.

Further, the piping may be installed on the lower side of the oxidation preventing portion.

The apparatus may further include a temperature detection sensor for sensing an internal temperature of the oxidation preventing portion.

A valve installed in the pipe; And

And a controller for controlling opening and closing of the valve according to a signal of the temperature detection sensor.

Here, when the internal temperature of the oxidation preventing unit is lowered to a predetermined temperature or less, the control unit may control the valve to prevent the gas from flowing into the oxidation preventing unit.

In addition, the control unit may control the opening and closing of the valve by a signal of the temperature detection sensor sent out after sensing the temperature change inside the oxidation preventing unit.

The apparatus may further include a position sensing sensor for transmitting a signal to the controller such that the gas is injected when the electrode is positioned at a predetermined position in the oxidation preventing portion.

According to a preferred embodiment of the present invention, The electrode oxidation preventing device; Electric furnace body; And an electrode oxidation prevention device including a transfer device for moving the electrode between the electric oxidation prevention device and the electric furnace body.

Here, the transfer device may include: an electrode arm provided with the electrode; An electrode lifting device for lifting the electrode arm; And a lifting device for moving the electrode lifting device between the electric oxidation prevention device and the electric furnace body.

According to a preferred embodiment of the present invention having the above-described structure, the electrode can be prevented from being oxidized by injecting a gas to surround the electrode when the electrode is waiting for operation.

Accordingly, it is possible to solve the problem that the electrode cost is increased by preventing the electrode from being naturally oxidized and improving the lifetime of the electrode.

Further, since the electrode is inserted into the oxidation preventing portion, deterioration of the peripheral equipment due to the high temperature of the electrode can be prevented.

Therefore, the electrode oxidation preventing device can reduce the production cost due to the oxidation prevention of the electrode, and can improve the productivity by preventing the production stoppage by preventing deterioration of the peripheral equipment by introducing the electrode oxidizing treatment into the electric furnace.

1 is a view showing a working process using a conventional electric furnace,
2 and 3 are views showing electrodes moving between a working position and a standby position in a conventional work process using an electric furnace,
4 is a view showing an electrode oxidation preventing apparatus according to a preferred embodiment of the present invention,
5 is a cross-sectional view showing the relationship between the oxidation preventing portion and the electrode of the electrode oxidation preventing device according to the preferred embodiment of the present invention,
6 is a view showing an electric furnace having an electrode oxidation preventing device according to a preferred embodiment of the present invention,
7 is a view showing an electrode moving between a working position and a charging position in an electric furnace having an electrode oxidation preventing apparatus according to a preferred embodiment of the present invention.

The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated and described in the drawings. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms including ordinal, such as second, first, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the second component may be referred to as a first component, and similarly, the first component may also be referred to as a second component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and redundant description thereof will be omitted.

The electrode oxidation prevention device 1 according to the preferred embodiment of the present invention is used in a steelmaking process in which an iron source such as scrap is melted using electric energy and then refined to a desired component and temperature, Prevents natural oxidation when exposed to the outside due to prolonged process atmosphere.

4 and 5, an electrode oxidation preventing apparatus 1 according to a preferred embodiment of the present invention includes an oxidation preventing part 100 having an accommodating space therein so that the electrode 50 can be inserted therein A pipe 200, a valve 300, a temperature detection sensor 300, and a control unit 500. The control unit 500 may include a controller (not shown)

The oxidation preventing portion 100 may be formed in a cylindrical shape. The electrode 50 is installed so as to be inserted into the accommodation space.

At this time, the electrode 50 is installed at a predetermined distance from the inner surface and the bottom surface of the oxidation preventing portion 100. Preferably, the electrode 50 may be installed at the center of the inside of the oxidation preventing portion 100. Accordingly, the gas transferred through the pipe 200 can be filled in the space S between the electrode 50 and the inner surface and the bottom surface.

The gas prevents the electrode 50 from being in contact with the outside air, thereby preventing the electrode 50 from being oxidized.

Further, the gas may be injected into the spacing space S through the pipe 200 after being heated or cooled to a predetermined temperature. Accordingly, since the gas maintaining the predetermined temperature exists around the electrode 50, the environmental influence such as the temperature difference with the outside air can be minimized.

In other words, since the gas having the predetermined temperature is injected into the space S, the operator can predict the influence of the electrode 50 due to the temperature. Accordingly, the influence of the electrode 50 on the gas temperature can be minimized, and the environmental influence such as the temperature difference with the outside air can be minimized.

At this time, nitrogen is preferable as the gas for preventing the oxidation of the electrode 50.

The piping 200 may be installed to communicate with one side of the oxidation preventing part 100. Accordingly, the discharge port 110 may be provided between the oxidation preventing portion 100 and the pipe 200 so that the gas can be injected.

5, the discharging port 110 may be formed in a shape corresponding to that of the oxidation preventing portion 100 in consideration of characteristics such as specific gravity, weight, etc. of the gas such as nitrogen and the process of filling the spacing space S according to the discharging position. It is preferable that it is formed in the lower part.

That is, since the discharge port 110 is positioned on the lower side of the oxidation preventing portion 100, the nitrogen is filled from the lower portion of the inside of the oxidation preventing portion 100.

A valve 300 is provided in the pipe 200 to adjust the amount of gas to be transferred along the pipe 200.

4 and 5, the temperature detection sensor 300 may be installed at one side of the interior of the oxidation preventing portion 100. [

The temperature detection sensor 300 detects the temperature inside the oxidation preventing portion 100. Then, the control unit 400 transmits a signal.

For example, when the internal temperature of the anti-oxidation unit 100 falls below a predetermined temperature, the temperature detection sensor 300 senses the internal temperature of the anti-oxidation unit 100 and sends a signal to the controller 400 to cause the gas to flow into the anti- Can be blocked.

The temperature detection sensor 300 senses a change in the internal temperature of the oxidation prevention unit 100 when the electrode 50 is inserted into the oxidation prevention unit 100 and transmits a signal to the control unit 400 . Accordingly, the control unit 400 opens the valve 300 to allow the gas to flow into the oxidation preventing unit 100.

The control unit 400 controls the opening and closing of the valve 300 based on the temperature information inside the oxidation preventing unit 100 detected by the temperature detecting sensor 300.

That is, by controlling the opening and closing of the valve 200 based on the temperature detected by the temperature detecting sensor 300, the gas such as nitrogen is injected into the oxidation preventing part 100, so that the electrode 50 is oxidized ≪ / RTI >

In addition, the control unit 500 may control the injection of the gas so that the temperature inside the oxidation preventing unit 100 is maintained at a predetermined temperature. Accordingly, the influence of the temperature on the electrode 50 may be minimized.

The position detecting sensor 600 may further include a position sensing sensor 600 for transmitting a signal to the controller 500 so that the electrode 50 may be positioned at a predetermined position within the oxidation preventing portion 100.

The position sensing sensor 600 may be installed to sense the lower end of the electrode 50, as shown in FIGS.

In addition, the position detection sensor 600 may be installed on the upper part of the oxidation preventing part 100. Accordingly, it is possible to detect that the electrode 50 enters the inside of the oxidation preventing part 100, and to send a signal to the control part so that the gas is injected.

Hereinafter, in describing the electric furnace 2 having the electrode oxidizing and keeping apparatus according to the preferred embodiment of the present invention, the same components used in the work process using the conventional electric furnace as described above will not be described .

6, an electric furnace 2 having an electrode oxidation and standing device according to a preferred embodiment of the present invention includes the electrode oxidation preventing device 1, the electrode 50, the electric furnace main body 80, A transfer device may be included.

The transfer device may include an electrode arm 40, a loop 70, a lifting device 90, and an electrode lifting device 91. Here, the loop 70 may be installed on one side of the electrode arm 40. [ The electrode arm 40 on which the electrode 50 is mounted is moved by the lifting device 90.

The transfer device moves the electrode 50 to a charging position where the electrode 50 is installed to be inserted into the oxidation preventing portion 100 of the electrode oxidation preventing device 1, .

6, the lifting device 90 and the electrode lifting device 91 of the electric furnace 2 including the electrode oxidation preventing device perform the dissolving work process using the electrode 50 The electrode 50 is moved to the charging position in which the working position and the electrode 50 are installed to be inserted into the oxidation preventing portion 100 of the electrode oxidation preventing device 1. [

Referring to FIG. 6, the operation of the electric furnace 2 including the electrode oxidizing and maintaining apparatus according to one preferred embodiment of the present invention will be described.

When the arcing is completed in the electric furnace main body 80, when the lifting device 90 rotates the loop 70, the electrode 50 is lifted so as to be positioned above the electrode oxidation preventing device 1, The device 91 raises the electrode 50.

When the electrode 50 is rotated by the lifting device 90 so as to be spaced on the electrode oxidation preventing device 1, the electrode lifting device 91 lowers the electrode 50, To be inserted into the oxidation preventing part (100) of the electrode oxidation preventing device (1).

At this time, the electrode oxidation preventing device (1) injects gas such as nitrogen into the oxidation preventing part (100) through the discharge port (110). Of course, it is also possible to cause the electrode 50 to fill the inside of the oxidation preventing portion 100 with the gas using the temperature detecting sensor 400 or the position detecting sensor 600.

When the internal temperature of the oxidation preventing part 100 of the electrode oxidation preventing device 1 falls below a predetermined temperature, the gas is detected through the temperature detecting sensor 300, (100).

The electrode 50 is raised by using the electrode lifting device 91 and then the loop 70 is moved to the working position using the lifting device 90 . Then, the electrode 50 is lowered to perform the arcing operation.

In other words, the electrode oxidation preventing device 1 according to the preferred embodiment of the present invention having the above-described structure is installed in the electric furnace 2 provided with the electrode oxidation preventing device, The electrode 50 is prevented from spontaneously oxidizing by injecting the gas so as to surround the electrode 50.

As used in this embodiment, the term " portion " refers to a hardware component such as software or an FPGA (field-programmable gate array) or ASIC, and 'part' performs certain roles. However, 'part' is not meant to be limited to software or hardware. &Quot; to " may be configured to reside on an addressable storage medium and may be configured to play one or more processors. Thus, by way of example, 'parts' may refer to components such as software components, object-oriented software components, class components and task components, and processes, functions, , Subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functions provided in the components and components may be further combined with a smaller number of components and components or further components and components. In addition, the components and components may be implemented to play back one or more CPUs in a device or a secure multimedia card.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

1: electrode oxidation prevention device
2: An electric furnace equipped with an electrode oxidation prevention device
40: electrode arm 50: electrode
60: electrode holder 70: loop
80: electric furnace main body 90: lifting device
91: Electrode lifting device
100: antioxidant part 200: piping
300: valve 400: temperature detection sensor
500: controller 600: position sensor

Claims (10)

An antioxidant portion provided inside the electrode so as to be inserted therein;
A piping connected to the oxidation preventing portion;
A temperature detection sensor for sensing an internal temperature of the oxidation preventing portion;
A valve installed in the pipe; And
And a controller for controlling opening and closing of the valve in accordance with a signal of the temperature detection sensor,
The gas transferred through the piping is filled in the space between the electrode and the oxidation preventing portion to surround the electrode and is heated to a predetermined temperature inside the oxidation preventing portion to maintain a predetermined temperature inside the oxidation preventing portion ≪ / RTI &
The control unit controls the opening and closing of the valve according to a signal of the temperature detecting sensor sent out after sensing the temperature change inside the oxidation preventing unit and adjusts the valve when the internal temperature of the oxidation preventing unit drops below a preset temperature And prevents the gas from flowing into the inside of the oxidation preventing portion. The method according to claim 1,
Wherein the gas is nitrogen. 3. The method of claim 2,
Wherein the pipe is provided on a lower side of the oxidation preventing portion. delete delete delete delete The method according to claim 1,
Further comprising a position sensor for transmitting a signal to the control unit such that the gas is injected when the electrode is positioned at a predetermined position in the oxidation preventing unit. electrode;
An electrode anti-oxidation device according to any one of claims 1 to 3 and 8;
Electric furnace body; And
And a transfer device for moving the electrode between the electrode oxidation preventing device and the electric furnace body. 10. The method of claim 9,
The transfer device
An electrode arm provided with the electrode;
An electrode lifting device for lifting the electrode arm; And
And an electrode oxidation preventing device including a lifting device for moving the electrode lifting device between the electrode oxidation preventing device and the electric furnace body.

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