KR101735004B1 - Apparatus for supplying the oxygon in electric furnace and apparatus for controlling power in the electric furnace using the same, and control method thereof - Google Patents

Apparatus for supplying the oxygon in electric furnace and apparatus for controlling power in the electric furnace using the same, and control method thereof Download PDF

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Publication number
KR101735004B1
KR101735004B1 KR1020150064561A KR20150064561A KR101735004B1 KR 101735004 B1 KR101735004 B1 KR 101735004B1 KR 1020150064561 A KR1020150064561 A KR 1020150064561A KR 20150064561 A KR20150064561 A KR 20150064561A KR 101735004 B1 KR101735004 B1 KR 101735004B1
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South Korea
Prior art keywords
electric furnace
temperature
oxygen
unit
power
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KR1020150064561A
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Korean (ko)
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KR20160131663A (en
Inventor
류재왕
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주식회사 포스코
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Publication of KR20160131663A publication Critical patent/KR20160131663A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
    • F27B3/28—Arrangement of controlling, monitoring, alarm or the like devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/08—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces heated electrically, with or without any other source of heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
    • F27D21/0014—Devices for monitoring temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0006—Electric heating elements or system
    • F27D2099/0021—Arc heating

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)

Abstract

An oxygen injecting apparatus, an electric furnace power controlling apparatus using the apparatus, and a control method thereof are disclosed. The electric railroad power control apparatus according to an embodiment of the present invention includes a power supply unit that supplies electric power to an electrode to generate an arc in a scrap in an electric furnace and a temperature detection unit that detects the temperature of molten steel scraped by the generated arc, And a power control unit for shutting off power supplied to the electrode through the power supply unit when the detected molten steel temperature is higher than the target temperature.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an oxygen injector and an electric furnace power control apparatus using the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to an oxygen inlet device, an electric power control device using the same, and a control method thereof.

Generally, in an electric furnace working process, a power for arcing is supplied to an electrode in an electric furnace to perform a scrap melting operation by generating an arc between an electrode and a scrap. In order to increase the speed of dissolving scrap during scrap melting operation and to reduce power, oxygen is injected to blow oxygen into electric furnace during scrap melting operation.

The amount of electric power to be supplied to the electrode in the electric furnace in the electric furnace scrap melting operation is calculated by calculating the amount of electric power to adjust the target temperature of the molten steel to the target temperature after the scrap is dissolved. In theory, the power supply is calculated on the basis of "power consumption (kwh) / ton". That is, the power supply amount is determined according to the amount of scrap supplied in the electric furnace. When the set power supply is supplied, the molten steel is introduced.

However, the scrap state supplied to the electric furnace, that is, the speed of dissolving in accordance with the weight scrap or the light scrap is different, and the speed of dissolution and the temperature of the molten steel are different according to the additive state and the oxygen blowing state. Therefore, when determining the amount of electric power to be supplied only considering the amount of scrap, the molten steel temperature may not satisfy the target temperature and may be higher or lower than the target temperature. If the molten steel temperature is higher than the target temperature, power is wasted due to unnecessary power input. There is a problem that the temperature must be lowered by adding a coolant to lower the temperature in the post-process. Further, if the molten steel temperature is lower than the target temperature, a quality defect occurs.

Korean Patent Laid-Open Publication No. 2013-0073133 (2013.07.03)

An embodiment of the present invention is to provide an electric furnace power control apparatus and a control method thereof that can prevent unnecessary power wastage by cutting off electric power supplied to an electrode in an electric furnace when the temperature of the molten steel in the electric furnace reaches a target temperature.

Another embodiment of the present invention provides an electric furnace power control apparatus and a control method thereof that can prevent quality defects of molten steel by guiding a worker to take measures when the temperature of molten steel to be introduced in the electric furnace is lower than a target temperature do.

Still another embodiment of the present invention is to provide an oxygen filling apparatus capable of preventing damage to a temperature detecting apparatus for detecting the temperature of molten steel in an electric furnace.

According to an aspect of the present invention, there is provided an electric arc furnace, comprising: a power supply for supplying electric power to an electrode to generate an arc between a scrap in an electric furnace and the electrode; A power controller for controlling power supplied to the electrode through the power supply unit according to the temperature of the molten steel in which the scrap is melted by the generated arc; A temperature detector for detecting the temperature of the molten steel; A scattering preventing cover that rotates in a direction to open or close the temperature detecting unit; And a moving unit for rotating the scatter preventing cover in accordance with a control signal of the power control unit so that the temperature detecting unit is opened and closed to prevent slag scattered in the electric furnace from splashing to the temperature detecting unit .

Also, the power control unit may rotate the shatterproof cover in a direction closing the temperature detecting unit while oxygen is blown into the electric furnace through an oxygen receiving unit for taking oxygen into the electric furnace, It is possible to rotate the scatter preventing cover in a direction in which the temperature detecting portion is opened.

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According to another aspect of the present invention, there is provided an electric arc furnace comprising: a power supply for supplying electric power to an electrode to generate an arc between a scrap and an electrode in an electric furnace; A temperature detector for detecting a temperature of the molten steel in which the scrap is melted by the generated arc; A power control unit for controlling power supplied to the electrode through the power supply unit according to the detected molten steel temperature; A protective cover for accommodating the temperature detecting portion therein so as to protect the temperature detecting portion from heat due to radiant heat in the electric furnace; An air supply unit for supplying air into the protective cover to cool the temperature detection unit; An air hose connecting the air supply unit and the protective cover; An air valve provided on the air hose to open and close an air path; A shroud cover rotatable in a direction of opening or closing the protective cover; And a moving unit for rotating the scatter preventing cover according to a control signal of the power control unit so that the protective cover is opened and closed to prevent slag scattered in the electric furnace from splashing to the temperature detecting unit .

delete

Also, the power control unit may rotate the shatterproof cover in a direction of closing the protective cover while oxygen is blown into the electric furnace through an oxygen inlet device for blowing oxygen into the electric furnace, It is possible to rotate the shatterproof cover in a direction to open the protective cover.

delete

delete

According to another aspect of the present invention, there is provided an oxygen blowing apparatus for blowing oxygen by inserting an oxygen pipe into an electric furnace in an electric furnace melting process, the apparatus comprising: ; A protective cover for accommodating the temperature detecting portion therein so as to protect the temperature detecting portion from heat due to radiant heat in the electric furnace; An air supply unit for supplying air into the protective cover to cool the temperature detection unit; An air hose connecting the air supply unit and the protective cover; An air valve provided on the air hose to open and close an air path; A shroud cover rotatable in a direction of opening or closing the protective cover; And a control unit for controlling rotation of the shatterproof cover so that the protective cover is opened and closed to prevent slag scattered in the electric furnace from splashing to the temperature detection unit, and while the oxygen is blown into the electric furnace, And a moving unit which rotates the cover and rotates the scatter preventing cover in a direction to open the protective cover when the oxygen is completely charged.

delete

According to another aspect of the present invention, there is provided an oxygen blowing apparatus for blowing oxygen by inserting an oxygen pipe into an electric furnace in an electric furnace melting process, the apparatus comprising: ; A scattering preventing cover that rotates in a direction to open or close the temperature detecting unit; And a control unit for controlling the rotation of the scatter preventing cover so that the temperature detecting unit is opened or closed to prevent slag scattered in the electric furnace from splashing to the temperature detecting unit, while the oxygen is blown into the electric furnace, And a moving unit which rotates the cover and rotates the scatter preventing cover in a direction to open the temperature detecting unit when the oxygen is completely blown.

The embodiment of the present invention can prevent the unnecessary power consumption by detecting the molten steel temperature in the electric furnace and cutting off the power supplied to the electrodes in the electric furnace when the detected molten steel temperature reaches the target temperature.

In another embodiment of the present invention, even if the amount of electric power supplied to the electrode in the electric furnace is greater than the reference electric energy, if the temperature of the molten steel in the electric furnace is lower than the target temperature, .

Still another embodiment of the present invention provides a structure for cooling of a temperature detection device mounted at an end of an oxygen inlet device so as to detect the temperature of molten steel in an electric furnace and a structure for preventing scattering, .

1 is a configuration diagram of an electric power control apparatus according to an embodiment of the present invention.
2 is a control block diagram of an electric furnace power control apparatus according to an embodiment of the present invention.
3 is a perspective view for explaining the oxygen inserting apparatus and the temperature detecting unit of FIG. 2;
4 is a control flowchart of a control method of an electric power control apparatus according to an embodiment of the present invention.
5 is a perspective view showing a configuration related to a temperature detector mounted in an oxygen inlet device of an electric furnace power control apparatus according to an embodiment of the present invention.
6 is a view for explaining a cooling and protection structure of a temperature detector of an electric power control apparatus according to an embodiment of the present invention.
FIG. 7 is a diagram for explaining how the air is supplied to the temperature detection unit of the electric power control apparatus according to the embodiment of the present invention to cool the temperature detection unit. FIG.
8 is a view for explaining a structure in which the protective cover of FIG. 6 is closed.
FIG. 9 is a view for explaining a structure in which the protective cover of FIG. 6 is opened.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below are provided by way of example so that those skilled in the art will be able to fully understand the spirit of the present invention. The present invention is not limited to the embodiments described below, but may be embodied in other forms. In order to clearly explain the present invention, parts not related to the description are omitted from the drawings, and the width, length, thickness, etc. of the components may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

1 is a configuration diagram of an electric power control apparatus according to an embodiment of the present invention.

1, an electric furnace 10 is an electric melting furnace that dissolves scrap S by an arc generated between an electrode 30 and a scrap S by an applied power after charging the scrap S, . The scrap (S) usually refers to scrapped scrap. Hereinafter, various scrap materials that can be charged into the electric furnace (10) to be melted are referred to collectively.

The electric furnace 10 can receive the scrap S therein. On the other hand, the opening provided on the upper portion of the electric furnace 10 can be closed by covering the loop 20. The loop 20 can seal the opening of the electric furnace 10 from the outside during the operation of the electric furnace 10 and can prevent the opening of the upper portion of the electric furnace 10 when the scrap S is charged into the electric furnace 10. [ So that the opening can be opened.

The electrode 30 includes an electrode and the like, and is a member capable of generating an arc between the electrode 30 and the scrap, regardless of its shape. For example, the electrode member 30 may be made of a carbon material, and wear may occur while generating an arc. In general, the electrode 30 may be formed of three patterns. That is, the three electrode pieces can be connected in the longitudinal direction. The electrode 30 enters the electric furnace 10 and contacts the scrap S as an object to be heated to supply an electric current to generate an arc between the scrap S and the lower end of the scrap S to melt the scrap S, .

The electric furnace 10 is divided into an AC electric furnace and a DC electric furnace depending on the type of an applied power source. The AC electric furnace can use three electrodes (R, S, T; 30-1, 30-2, and 30-3) for generating an arc. However, the number of the electrodes 30 used in the AC electric furnace may include two, four, and the like. Although an AC electric furnace is shown as an example of an electric furnace 10 in which an electric furnace power control apparatus according to an embodiment of the present invention is used, it can also be applied to a DC electric furnace.

The electrode arm (40) supports the electrode (30).

The hydraulic cylinder 41 supports the electrode arm 40 and moves the electrode arm 40 up and down when it is necessary to raise and lower the electrode 30.

The electrode arm (40) is connected to the power supply unit (60) by a power cable (50).

The power supply unit 60 supplies electric power to the electrode 30 through the power cable 50.

When electric power is supplied to the electrode 30 after the scrap S is placed in the electric furnace 10 and the roof 20 is closed and the electrode 30 is lowered toward the scrap S, And the electrode 30, the electric power is turned into heat. The molten steel starts to flow to the bottom of the electric furnace 10 while the scrap S melts.

FIG. 2 is a control block diagram of an electric power control apparatus according to an embodiment of the present invention, and FIG. 3 is a perspective view for explaining the oxygen inlet device and the temperature detector of FIG.

2 and 3, the electric furnace power control apparatus may include a power supply unit 60, a power control unit 70, a worker terminal 80, a power measurement unit 90, and a temperature detection unit 100 .

The operator terminal 80, the power measurement unit 90 and the temperature detection unit 100 are electrically connected to the input side of the power control unit 70. [

And is electrically connected to the power supply unit 60 on the output side of the power control unit 70.

The electric power supply unit 60 supplies electric power to the electrode 30 in the electric furnace 10 in accordance with the control signal of the electric power control unit 70. [

The electric power supply unit 60 may include an electric switch 61, an electric transformer 62, an electric circuit breaker 63 and a diverter switch 64. The switch 61 supplies or cuts off power supplied to the electrode 30 in the electric furnace 10 from the electric furnace transformer 62. The electric furnace transformer 62 converts the input power into a power source having a voltage level necessary for the electric furnace melting operation and supplies the power. The electric circuit breaker (63) cuts off the power input to the electric transformer (62). The electric circuit breaker (64) cuts off the electric power supplied to the electric transformer (62) through the electric circuit breaker (63) in the variable electric power. The electric power supply unit 60 supplies electric power to the electric furnace 10 by supplying the electric power to the electric power transformer 62 by operating the electric power circuit breaker 63 in accordance with the control signal of the electric power control unit 70, And the power supplied to the electric furnace 10 is cut off by cutting off the supplied power.

The power controller 70 performs the function of the overall electric furnace power controller.

The worker terminal 80 inputs information to the power control unit 70 by the operator or displays the information output from the power control unit 70 to the operator. The worker terminal 80 may be a desktop computer, a notebook, a mobile device, or the like.

The power measuring unit 90 measures an arc voltage and an arc current supplied from the power supply unit 60 to the electrode 30 in the electric furnace 10 and outputs the detected electric power information from the arc voltage and the arc current, .

The temperature detector 100 is provided in the oxygen injector 110 for taking in oxygen in the electric furnace 10 and detects the temperature of the molten steel in the electric furnace 10 and outputs the detected temperature information to the electric power controller 70 . The temperature detector 100 may include a non-contact temperature sensor. A non-contact type temperature sensor is a method of measuring the temperature without contacting the sensor with the object to be measured, and detects the temperature of the object from the measurement of the radiant (radiation) energy emitted by the object. The non-contact temperature sensor may be a pyrometer or an optical pyrometer. Pyrometers are collectively referred to as non-contact instruments that measure the surface temperature of an object based on the intensity of radiant energy emitted from the surface depending on the temperature of the object. The optical pyrometer is a temperature sensor that can be used for high temperature (for example, 1000 ° C or more) measurement. Non-contact temperature sensors can be implemented in various forms.

The oxygen inserting device 110 includes a support 111, an arm member 112 supported by the support 111 and coupled to two arms perpendicular to each other, a movable member 112 mounted on the lower end of the arm member 112, (113). For example, the moving part 113 advances or retracts the oxygen pipe 114 so that the oxygen pipe 114 passing through the inside thereof is inserted into the electric furnace 10. The moving part 113 may include a casing through which the oxygen pipe 114 passes, a guide roller provided on the casing so as to closely contact and guide the oxygen pipe 114 so as to move forward or backward, have.

In addition, the oxygen introducing apparatus 110 may include an oxygen supplying unit for supplying oxygen to the oxygen pipe 114. For example, the oxygen supply unit includes an oxygen valve that opens or closes an oxygen path supplied from the oxygen tank storing oxygen to the oxygen pipe 114, and an oxygen hose that transfers oxygen supplied through the oxygen valve to the oxygen pipe can do.

The distal end of the arm member 112 of the oxygen inlet device 110 is connected to the opening 11 of the electric furnace 10 so that the oxygen pipe 114 can be inserted into the electric furnace 10 Located.

The oxygen injecting apparatus 110 having the above-described configuration moves the oxygen pipe 114 when the oxygen is blown in the electric furnace melting operation and is inserted into the electric furnace 10 and the oxygen is supplied to the electric furnace 10 through the oxygen pipe 11, Lt; / RTI >

The power control unit 70 receives the temperature information output from the temperature detection unit 100 and recognizes the molten steel temperature in the electric furnace 10.

The power control unit 70 compares the detected molten steel temperature with the target temperature through the temperature detection unit 100, and supplies power to the electrode 30 or stops power supply according to the comparison result. That is, the power control unit 70 cuts off the power supplied to the electrode 30 through the power supply unit 60 when the detected molten steel temperature is higher than the target temperature.

The power control unit 70 compares the power supply amount with the reference power amount when the detected molten steel temperature is lower than the target temperature as a result of comparing the detected molten steel temperature with the target temperature through the temperature detection unit 100, 30) or warns the operator of the current molten steel condition. That is, if the detected molten steel temperature is lower than the target temperature and the amount of power calculated from the power measured through the power measuring unit 90 is greater than the reference amount of power, the power control unit 70 informs the operator of the molten steel status via the worker terminal 80 do.

At this time, the reference power amount is an amount of power determined according to the amount of scrap S charged into the electric furnace 10. In addition, the reference power amount may be the amount of power input by the operator.

When the detected molten steel temperature is lower than the target temperature and the calculated amount of power is less than the reference power amount, the power control unit 70 supplies power to the electrode 30 continuously. At this time, the power control unit 70 receives the power information output from the power measuring unit, and calculates the amount of power supplied to the electrode 30 of the electric furnace 10 according to the received power information and the power supply time.

With the above configuration, the electric furnace power control apparatus according to the embodiment of the present invention detects the temperature of the molten steel in the electric furnace 10 in a state where oxygen blowing is blocked during the electric furnace melting operation, , The power supply is interrupted according to the comparison result to stop the electric furnace melting operation or continue the melting operation or warn the operator that the temperature of the molten steel is low. Thus, since the temperature of the molten steel reaches the target temperature, it is possible to prevent unnecessary power injection and to prevent quality defects that occur due to a low temperature of molten steel being introduced.

4 is a control flowchart of a control method of an electric power control apparatus according to an embodiment of the present invention.

Referring to FIG. 4, the power controller 70 supplies electric power to the electrode 30 in the electric furnace 10 through the electric power supply unit 60 to perform an electric furnace melting operation (200).

The electric power control unit 70 detects the temperature of the molten steel in the electric furnace 10 through the temperature detecting unit 100 (210).

After detecting the molten steel temperature in the operation mode 210, the power control unit 70 compares the detected molten steel temperature with the target temperature to determine whether the detected molten steel temperature is equal to or higher than the target temperature (220).

If the detected molten steel temperature is equal to or higher than the target temperature as a result of the determination in the operation mode 220, the power control unit 70 cuts off the power supplied to the electrode 30 in the electric furnace 10 through the electric power supply unit 60, And stops the operation (230).

On the other hand, if the molten steel temperature detected as a result of the operation mode 220 is less than the target temperature, the power supply amount supplied to the electrode 30 in the electric furnace 10 is calculated (240).

After calculating the power supply amount in the operation mode 240, the power supply amount is compared with the reference power amount to determine whether the power supply amount is equal to or greater than the reference power amount (250).

If the calculated power supply amount is less than the reference power amount as a result of the determination in the operation mode 250, the power control unit 70 moves to the operation mode 200 and performs the following operation modes.

On the other hand, if the calculated power supply amount is greater than the reference power amount as a result of the determination in the operation mode 250, the power controller 70 notifies the worker that the temperature of the molten steel to be piped in the electric furnace 10 is lower than the target temperature, A warning message is displayed on the display unit 80 (step 260).

FIG. 5 is a perspective view illustrating a configuration related to a temperature detector mounted in an oxygen inlet device of an electric power control apparatus according to an embodiment of the present invention, and FIG. 6 is a perspective view of an electric power control apparatus according to an embodiment of the present invention. FIG. 7 is a view for explaining a cooling and a protection structure of the temperature detection unit, and FIG. 7 is a view for explaining cooling by supplying air to the temperature detection unit of the electric power control apparatus according to an embodiment of the present invention.

5 to 7, the temperature detector 100 is mounted on the distal end of the arm member 112 of the oxygen inlet device 110 to detect the temperature of the molten steel in the electric furnace 10.

The temperature detecting unit 100 is accommodated in a protective cover 101 for protecting from heat due to radiant heat generated in the electric furnace 10.

The protective cover 101 is connected to an air hose 106 for supplying air to the temperature detecting unit 100 housed therein to supply air for cooling.

The air hose 106 is provided with an air valve 107 to open and close an air path between the air supply part 120 and the protective cover 101. The air valve 107 and the air supply unit 120 can be turned on or off according to a control signal of the power control unit 70.

Therefore, it is possible to cool the temperature detecting unit 100 by supplying air to the protective cover 101, thereby preventing the temperature detecting unit 100 from failing due to the heat due to radiant heat in the electric furnace 10.

In order to prevent the slag from splashing to the temperature detecting part 100 during the process of blowing oxygen into the electric furnace 10 using the oxygen inlet device 110 or the electric furnace melting process outside the protective cover 101, A cover 102 is provided.

One side of the scattering prevention cover 102 is connected to the cover bearing 103 and the other side thereof is connected to the cover cylinder 104 as a moving part so as to be rotatable in the direction of opening or closing the protective cover 101. [ The other side of the cover cylinder 104 is connected to the cylinder base 105 mounted on the arm member 112 of the oxygen inlet device 110. The cover cylinder 104 moves forward and backward in accordance with the control signal of the power control section 70. The cover cylinder 104 is an example of a moving part, and all of the devices capable of moving the anti-scattering cover 102 in addition to the cover cylinder 104 are all electric and electronic devices.

The cover cylinder 104 is operated so that the scattering prevention cover 102 is closed while the temperature detection unit 100 is not operated and the cover cylinder 104 is operated while the temperature detection unit 100 is operating, 102) is opened. For example, while the oxygen is blown into the electric furnace 10, the scatter preventing cover 102 is closed to protect the temperature detecting portion 100 (see FIG. 8) So that the temperature of the molten steel in the electric furnace 10 can be detected (see FIG. 9).

In the above-described embodiment, the temperature detecting unit 100 is configured to have the cooling structure using the protective cover 101 and the slug protection structure using the scatter preventing cover 102, but the present invention is not limited thereto The structure in which only the cooling structure using the protective cover 101 is applied to the temperature detection unit 100 or the structure in which only the slag protection structure using the scatter prevention cover 102 is applied to the temperature detection unit 100 is also possible.

10: Electric furnace 20: Loop
30: electrode 40: electrode arm
50: power cable 60: power supply
70: power control unit 80: worker terminal
90: Power measurement unit 100: Temperature detection unit
110: Oxygen inserting device

Claims (10)

A power supply for supplying electric power to the electrode to generate an arc between the scrap in the electric furnace and the electrode;
A power controller for controlling power supplied to the electrode through the power supply unit according to the temperature of the molten steel in which the scrap is melted by the generated arc;
A temperature detector for detecting the temperature of the molten steel;
A scattering preventing cover that rotates in a direction to open or close the temperature detecting unit; And
And a moving unit for rotating the scatter preventing cover according to a control signal of the power control unit so that the temperature detecting unit is opened or closed to prevent slag scattered in the electric furnace from splashing to the temperature detecting unit. The method according to claim 1,
Wherein the power control unit rotates the scatter preventing cover in a direction closing the temperature detecting unit while oxygen is taken into the electric furnace through an oxygen receiving unit for taking in oxygen into the electric furnace, Shielding cover in a direction to open the shielding cover. A power supply for supplying electric power to the electrode to generate an arc between the scrap in the electric furnace and the electrode;
A temperature detector for detecting a temperature of the molten steel in which the scrap is melted by the generated arc;
A power control unit for controlling power supplied to the electrode through the power supply unit according to the detected molten steel temperature;
A protective cover for accommodating the temperature detecting portion therein so as to protect the temperature detecting portion from heat due to radiant heat in the electric furnace;
An air supply unit for supplying air into the protective cover to cool the temperature detection unit;
An air hose connecting the air supply unit and the protective cover;
An air valve provided on the air hose to open and close an air path;
A shroud cover rotatable in a direction of opening or closing the protective cover; And
And a moving unit for rotating the shatterproof cover according to a control signal of the power control unit so that the protective cover is opened and closed to prevent slag scattered in the electric furnace from splashing to the temperature detection unit. delete The method of claim 3,
Wherein the power control unit rotates the shielding cover in a direction to close the protective cover while the oxygen is blown into the electric furnace through an oxygen injecting unit that takes in oxygen into the electric furnace, Shielding cover in a direction to open the shielding cover. delete delete An oxygen blowing apparatus for blowing oxygen by inserting an oxygen pipe into an electric furnace during an electric furnace scrap melting operation,
A temperature detecting unit provided at a distal end of the oxygen inlet device for detecting a temperature of molten steel in the electric furnace;
A protective cover for accommodating the temperature detecting portion therein so as to protect the temperature detecting portion from heat due to radiant heat in the electric furnace;
An air supply unit for supplying air into the protective cover to cool the temperature detection unit;
An air hose connecting the air supply unit and the protective cover;
An air valve provided on the air hose to open and close an air path;
A shroud cover rotatable in a direction of opening or closing the protective cover; And
Wherein the shield cover is rotated so as to open and close the protective cover so as to prevent the slag scattered in the electric furnace from splashing to the temperature detection unit, and while the oxygen is blown into the electric furnace, And a moving unit which rotates the scatter preventive cover in a direction of opening the protective cover when the oxygen is completely injected. delete An oxygen blowing apparatus for blowing oxygen by inserting an oxygen pipe into an electric furnace during an electric furnace scrap melting operation,
A temperature detecting unit provided at a distal end of the oxygen inlet device for detecting a temperature of molten steel in the electric furnace;
A scattering preventing cover that rotates in a direction to open or close the temperature detecting unit; And
Wherein the temperature detecting portion is rotated so that the slag scattered in the electric furnace is prevented from splashing to the temperature detecting portion, and while the oxygen is blown into the electric furnace, And a moving unit which rotates the scatter preventing cover in a direction to open the temperature detecting unit when the oxygen is completely injected.
KR1020150064561A 2015-05-08 2015-05-08 Apparatus for supplying the oxygon in electric furnace and apparatus for controlling power in the electric furnace using the same, and control method thereof KR101735004B1 (en)

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KR1020150064561A KR101735004B1 (en) 2015-05-08 2015-05-08 Apparatus for supplying the oxygon in electric furnace and apparatus for controlling power in the electric furnace using the same, and control method thereof

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