KR20000020594U - MOVING Cooling apparatus for electric arc furnace electrodes. - Google Patents

Abstract

The present invention relates to a method for cooling an upper electrode of an electric steelmaking furnace, and more particularly, by installing a cooling device in the upper part of the furnace to move the electric steelmaking furnace to a position where the electrode can be cooled during non-electrical cooling and electric While the steel furnace is energized, it includes a device that moves the air to a safe location and protects it from the SPRAK.

This method is a method of cooling by spraying cooling water on the electrode surface.

Steelmaking in the furnace generates ARC between the raw material charged in the furnace and the tip of the electrode, and heats the raw material with the ARC heat.The electrode consumed by the ARC generated from the tip and the ARC heat is heated to a high temperature. It is divided into surface consumption which is oxidized and consumed by contact with.

According to the present invention, the higher the temperature and the more exposed portions to the atmosphere, the more the surface consumption mentioned above increases. Therefore, the electrode is cooled by cooling water to lower the temperature and minimize the contact with the atmosphere. How to reduce it.

According to the present invention, in the electrode cooling device, the stationary cooling device installed at the electrode holder portion cools the upper portion of the electrode but does not cool the lower portion of the high temperature portion. Its purpose is to reduce production costs by reducing surface oxidation consumption.

While the current flows through the electrode, it moves to the standby position and stops its use, eliminating the possibility of generating a spark between the electrode and the cooling device.

Therefore, while the electrode is energized, this cooling device is far from the electrode, and during non-energization, it moves to the middle of the electrode to cool it.

Description

MOVING Cooling apparatus for electric arc furnace electrodes.

The object of the present invention is to reduce electrode consumption by minimizing contact with the atmosphere while cooling with coolant because the electrode is rapidly consumed when the temperature is high and is oxidized and consumed when exposed to the atmosphere.

It is a cooling device to increase the cooling effect by installing a mobile cooling device in the middle of the electrode. It is characterized by eliminating the possibility of generating a spark between the electrode and the cooling device when the current of the electrode is conducted.

Therefore, while the electrode is energized, this cooling device is far from the electrode and during non-energization, it moves to the middle of the electrode to cool it.

The present invention has an object to reduce the surface consumption of the non-energized electrode by minimizing contact with the atmosphere while cooling with cooling water because the electrode is consumed quickly when the temperature is high, and oxidized and consumed when exposed to the atmosphere.

An electric furnace uses an alternating current or a direct current to generate ARC between a raw material charged in a furnace and an electrode to heat the raw material using the high temperature.

Since the arc temperature generated between the electrode and the charging material is high temperature, the electrode is quickly consumed. In the case of alternating current furnace, there are 3 electrodes / road and in the case of direct current furnace, 1 electrode / road, in the case of 1 power source and 2 furnaces, 6 electrodes of AC road and 2 electrodes are required. It is used in electric furnaces and refining furnaces. The electrode tip is gradually consumed by ARC heat because ARC is generated, and the surface is oxidized and consumed by contact with air. It is divided into tip consumption and surface consumption to distinguish two types of consumption.

While the electrode is energized, the lower part of the electrode is heated to a high temperature by the ARC heat at the tip, so that not only the tip consumption but also the surface consumption is faster than the top.

This consumption raises the electrode unit, resulting in an increase in the overall manufacturing cost.

In order to reduce the surface consumption, the conventional method installs a fixed cooling device under the electrode H0LDER that catches the electrode on the upper side of the electrode to cool the SPRAY. However, the high temperature part of the lower part of the electrode is consumed quickly because of the high temperature. Becomes like the part. This phenomenon is called PENCIL phenomenon.

Therefore, when the coolant flows through the upper part, the coolant flows down along the surface of the electrode to cool down, but as the lower part cools the electrode at a higher temperature, the lower part gradually flows down, and a large amount of coolant is evaporated into water vapor and is about 1/2 length from the upper part. In the case of coolant, only a small amount of coolant is left, and the amount of coolant that flows to the lower portion is PENCIL, and the coolant does not flow along the electrode and falls down.

The fixed type installed directly under the electrode holder has the effect of cooling about 1/2 of the total electrode length, and the other half length is less effective.

Due to the development of electric furnace technology, the electric furnace of one power supply and two way system has been practically used since the early 1990s and is gradually increasing. This method is to save power by preheating the charged charging material by passing the closed cutlet through the tarot when one side is energized.

The furnace in which the charged material is preheated is called a non-conduction furnace (preheating furnace). The electrode of the non-conduction furnace is cooled by a fixed cooling device fixed to HOLDER, but the cooling effect is reduced, thereby making the present invention.

The present invention has been invented to solve the present problem that only about 1/2 of the surface of the electrode of the non-conduction furnace as described above is cooled and the remaining 1/2 length is inferior in cooling effect. This invention is a method of cooling about half of the electrode length in non-energization through a portable cooling apparatus.

This approach works as follows.

The charging material in the furnace should be charged.

The electrode should be in the upper position.

The switch should be on the live path side.

If this condition is satisfied, it is considered as non-conduction path.

When the condition of the non-conducting path is satisfied, the two pipes with the nozzles of the cooling device in the standby position are moved to the electrode side with both sides open and the electrode stops when it reaches the electrode position to cool the electrode. The detector is called the position and the sensor is activated to confirm that the electrode position has been reached. Next, the cooling unit is raised to the electrode position 1/2 to determine the cooling position. When the predetermined height is reached, the height sensor is activated. When the detector is activated, the two open pipes close to the outer diameter of the electrode are opened so that they can pass through the diameter of the electrode. If these conditions are met

The coolant opening valve is transferred from the lungs to the dog, and the cooling water flows to cool it.

When the non-conduction path is changed to the energization path, close the cooling water valve, open the two pipes and move them back to the standby position in the reverse order.

This method cools the electrodes of the non-coiler and thus cools them during the TAP TO TAP. Of course, the fixed chiller under the HOLDER of the energized and non-energized furnaces is always in operation to cool the electrodes.

The advantage of portable cooling units installed in non-conduction furnaces is that

(1) Reduction of production cost by reducing electrode surface consumption by oxidation

(2) Maximize savings with low investment costs

(3) Maintenance is easy and repairs are made in non-conduction paths.

Repairable and safe without shortening

(4) Regardless of type, capacity and size of electrode

Applicable to non-electric furnace of electric furnace

Figure 1 shows the movable SPRAY cooling device 1 being cooled by moving from the standby position of the non-conduction path to the cooling position.

Fig. 2 shows the state of energizing and non-energizing power supply of the 1 power supply and 2 electric furnace, the state in which the cooling device 1 of the non-energizing path (A) is in operation and the standby position of the cooling device 1 of the energizing path (B).

<Description of the code | symbol about the principal part of drawing>

1: mobile electrode cooling device (the invention)

2: Fixed cooling device fixed to holder

3: electrode HOLDER

4: electrode

5: power switch

6: charging material

7: electrode cap

If B is selected as the electrification path in Fig. 2, the mobile cooling device 1 closes the coolant valve to shut off the coolant, opens two nozzle pipes so that they can exit the electrode, and moves them to the standby position. If the above conditions are met, electricity can be supplied to B. For example, in case of B electricity supply and A furnace is non-electric furnace, power switch 5 is closed for B and A is open. Supply power.

When the power switch 5 for furnace B is input, electrode 4 heats up the charging material 6 while raising and lowering, while in A, the electrode is placed in the upper position as a non-conduction path and cooled by a portable cooling device. The figure to explain in detail the mobile SPRAY cooling device. First, when scrap 6 is loaded in the furnace, the charging material is preheated to reduce the power source unit. The electrode 4 is raised to the upper limit and the electrode cap 7 is closed and cooled by the fixed spray cooling device 2, but the upper part 1 / 2 is the cooling water flowed from the stationary cooling unit 2 and cooled, but in the lower half heated by the ARC, the high temperature state is so that the cooling water by the cooling unit 2 is almost evaporated as it flows along the electrode surface and is below the position where the mobile cooling unit 1 is installed. Can hardly cool.

Therefore, Figure 1 shows the additional installation of a mobile cooling device 1 to reduce electrode consumption, which is the object of the present invention.

This portable cooling device is moved to the standby position when it is energized to be in the correct position. If the electrode remains in the cooling position while energized, SPARK may occur due to the high voltage and current flowing through the electrode, which may lead to an accident.

Therefore, it must be in the standby position while the power is on. This movement and positioning is done automatically by mechanical devices and electrical PROGAM.

The principle of operation is as follows.

1) Open the pipe in the nozzle area from the standby position to the cooling device 1.

2) Move to the electrode position.

3) Raise to 1/2 position of electrode (cooling position).

4) Close the nozzle pipe so that it almost matches the outer diameter of the electrode.

5) Open the coolant valve and pass it through.

The detector is installed to confirm the completion of each step is linked to operate according to the order.

The movement to the standby position is performed in the reverse order described above.

Missing the effect of the devise

Claims (1)

In the cooling device of the electrode cooling device of the electric furnace steel, Except for the fixed SPRAY chiller roll installed in the electrode holder, Step to open N0ZZLE PIPE, Moving to the electrode side, Moving to a cooling position, Opening and closing the coolant valve, Cooling step, Electrode cooling method characterized in that it consists of the reverse order of cooling and moving to the standby position.