JPH1129815A - Method for preheating charging material into arc furnace and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an equipment cost of the whole work for arranging a preheating device for charging material and to enable extension of the preheating device for charging material to the existing work, in a preheating method for changing material and a device therefor of an arc furnace used to melting of metallic material and refining of molten metal. SOLUTION: A shifting device 3 for shifting a material vessel 1 for preheating the charging material features that the material vessel 1 can be shifted not only horizontally, but also vertically. At the time of charging the material, the material vessel 1 is set to a material charging position at the lower part from the charging position 32 into the arc furnace, and the charging material is charged into the material vessel 1 by using a charging bucket 8, etc., hung down with a crane 9. Therefore, a lift of the crane 9 in the work can be made low in comparison with the conventional device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to the dissolution of metallic materials,
The present invention relates to a method and an apparatus for preheating a charged material of an arc furnace used for refining molten metal.

[0002]

2. Description of the Related Art In an arc furnace for scouring, an electric current is applied between an electrode disposed above a metal material charged into the furnace and an electrode mounted on a furnace bottom or a side wall, etc., to melt the metal material. DC arc furnaces for refining molten metal, and AC arc furnaces for melting metal materials and refining molten metal by passing current between three electrodes arranged above the molten metal charged in the furnace are used. Have been. In this type of arc furnace, if the sensible heat of the high-temperature exhaust gas generated during melting and refining is used to preheat the metallic material charged into the furnace, the heat energy required for melting and refining can be saved. Can be.

Various devices have been conventionally proposed as devices for preheating a charged material using sensible heat of exhaust gas from an arc furnace. The method of holding and preheating the charged material in a preheating vessel called a shaft provided on the furnace lid is an advantageous method in terms of heat recovery because the high-temperature exhaust gas from the arc furnace can be directly used, but on the other hand, The material holding gate provided at the lower end of the shaft has a problem that it receives a drop impact load when the material is charged into the shaft and is exposed to high-temperature exhaust gas during preheating.

To solve this problem, Japanese Patent Application Laid-Open No. 8-285
In the invention described in Japanese Patent No. 476, a shaft for preheating a material is provided so as to be movable in a horizontal direction, a raw material charging section and an exhaust gas outlet are provided at the top of the shaft, and a holding mechanism for holding the material charged at the bottom of the shaft. A gate and an exhaust gas inlet were provided. The shaft is moved to the preheating position near the arc furnace, the charging material bucket is arranged above the shaft, and the charging material is charged into the shaft from the charging material bucket through the raw material charging section at the top of the shaft. The preheating of the charged material is carried out by introducing the exhaust gas of the arc furnace into the shaft from. After completing the preheating, the shaft is moved horizontally above the furnace body, and the charge is charged into the furnace by opening the holding gate at the bottom of the shaft. This makes it possible to perform preheating without exposing the holding gate provided at the lower end in the shaft to a high temperature.

[0005]

In the prior art, the shaft for preheating the charge is arranged fixedly above the furnace body or movably in the horizontal direction. When charging the charging material into the shaft, the charging material was mounted on the charging material bucket, and the charging material bucket was disposed above the shaft by a crane, and provided at the bottom of the charging material bucket. This is done by opening the gate. Due to the above configuration, the height of the crane installed in the factory must be a height that combines the height of the furnace body, the height of the shaft, and the height of the charging material bucket. Inviting, when adding a preheating device to an existing factory, it will not be possible to install it depending on the lift of the existing crane.

[0006] In the invention described in Japanese Patent Application Laid-Open No. 8-285476, the shaft is moved in the horizontal direction by a carriage mounted on rails. In order to hold such a rail on which the carriage moving in the horizontal direction is mounted, it is essential to construct a gantry having pillars at the four corners, which hinders the compact arrangement of equipment in a factory. In addition, when adding a preheating device to an existing factory, there is a case where there is no room for installing the rail and a gantry holding the rail.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, reduces the equipment cost of the entire factory for installing the charging material preheating apparatus, and makes it possible to add the charging material preheating apparatus to an existing factory. It was done to do so.

[0008]

According to the present invention, a moving device 3 for moving a material container 1 for preheating a charged material 18 is provided.
Is characterized in that the material container 1 can be moved not only horizontally but also vertically. Charge material 1 in material container 1
At the time of charging, the material container 1 is placed in the material charging position 32 near the arc furnace interior charging position 31 and below the arc furnace interior charging position 31, and the charging bucket 8 suspended by the crane 9. The charging material 18 is charged into the material container 1 by using the method described above. Therefore, it is possible to reduce the lift of the crane 9 in the factory as compared with the conventional apparatus. When the material container 1 is placed at the material preheating position 33 after charging the material, the exhaust gas from the arc furnace 2 passes through the material container 1 and the charged material 18 is charged.
Is preheated. After the preheating is completed, the material container 1 is placed at the arc furnace interior entry position 31 above the arc furnace, and the material container 1
The charging material 18 is discharged from the bottom of the furnace and charged into the arc furnace.

That is, the gist of the present invention is as follows. In a method for preheating a charged material in an arc furnace, in which a material to be charged into an arc furnace is preheated in a material container 1 by utilizing sensible heat of exhaust gas from an arc furnace 2, a material container 1 is horizontally and vertically heated by an arc furnace. It is configured to be able to move and move up and down between the interior charging position 31, the material charging position 32, and the material preheating position 33. The material charging position 32 is below the arc furnace interior positioning position 31, and the material container 1 is moved. Arranged at the material charging position 32, the charged material 18 is charged into the material container from the top of the material container, and then the arc furnace exhaust gas is introduced into the material container 1 at the material preheating position 33 to preheat the charged material 18, Next, the material container 1 is disposed at the arc furnace interior charging position 31, the material container 1 is disposed above the arc furnace 2, and the charging material 18 is charged from the material container 1 into the arc furnace. Furnace preheating method It is. Further, the material input position 32 and the material preheating position 33 can be the same position.

A material container 1 for preheating a material to be charged into the arc furnace by utilizing sensible heat of exhaust gas from the arc furnace;
A moving device 3 for moving and raising and lowering the material container 1 between the arc furnace interior entry position 31, the material introduction position 32, and the material preheating position 33 in the horizontal and vertical directions, and discharges the arc furnace exhaust gas at the material preheating position 33. It has an exhaust gas introducing means for introducing the material into the material container 1 and an exhaust gas discharging means for discharging the exhaust gas from the material container. The material input position 32 is below the arc furnace interior entry position 31. The material container 1 is located above the arc furnace 2, and the material container 1 has a discharge means for discharging the material downward from the bottom thereof. Further, the material input position 32 and the material preheating position 33 can be the same position. Further, the horizontal movement may be a turning movement about a fixed axis.

[0011]

1 and 2 are front views showing one embodiment of the present invention. FIG. 1 shows a material container 1 in an arc furnace interior insertion position 31, and FIG. It is located at the position which also serves as the charging position 32 and the material preheating position 33. FIG. 3 is a plan view showing the same embodiment.
In the same position as FIG. 4 is a side view as seen from the direction of AA ′ in FIG.

The charging material 18 is introduced into the material container 1 from above the material container 1. When the preheating of the charging material 18 is completed, a discharging means is provided at the bottom of the material container so that the charging material can be discharged from the lower portion of the material container. In this embodiment, the discharging means is constituted by an openable / closable gate 17,
The charged material 18 can be held in the material container 1 with the gate closed, and the charged material 18 can be discharged downward by opening the gate.

The material container 1 is supported by a moving device 3 which can move the material container 1 horizontally and vertically. In the present embodiment, the horizontal movement can be performed by turning the turning device 5 about a fixed axis. Horizontal movement can also be performed by a carriage that moves horizontally on a rail. In the case of disposing rails for moving the carriage horizontally, it is necessary to dispose the gantry for holding the rails at the four corners of the rails, which hinders the compact arrangement of equipment in a factory. In addition, when adding a preheating device to an existing factory, there is a case where there is no room for installing the rail and a gantry holding the rail. If a method of performing horizontal movement by the turning device 5 as in the present embodiment is employed, since the moving device 3 can be supported only by the turning device 5, the entire device can be made compact, and the rails and rails can be reduced. In some cases, it may be possible to modify an existing factory where a holding frame cannot be installed.

The vertical movement of the moving device 3 is performed by the lifting device 4. In the present embodiment, the lifting device 4 includes an arm 16 supporting the material container 1 and a lifting cylinder 11 connected to the arm 16. A guide post 15 is erected on the turning device 5, and an arm 16 of the lifting device 4 is slidably engaged with the guide post 15, and a guide roller 10 is engaged with an engagement portion between the arm 16 and the guide post 15. Are arranged so that the arm 16 can smoothly move up and down. The elevating mechanism of the elevating device 4 is not limited to the one shown in the present embodiment, but can also be driven by, for example, driving the guide roller 10 with an electric motor, and the most appropriate method can be selected. In the present embodiment, since the moving device 3 has both turning and lifting, the layout is compact.

As is clear from FIGS. 1, 2 and 3, the material container 1 is placed in the arc furnace 2 at the arc furnace interior entry position 31.
The charging material in the material container can be charged into the arc furnace by opening the openable gate 17 at the bottom of the material container.

At the material charging position 32, the material container 1 is located near the arc furnace interior position 31 and below the arc furnace interior position 31. In the present embodiment, the material input position 32 and the material preheating position 33 are the same position, but may be separate positions.

At the material preheating position 33, there is provided exhaust gas introducing means for introducing the arc furnace exhaust gas into the material container 1. In this embodiment, as shown in FIGS. 3 and 4, the exhaust gas inlet duct 6 provided on the side surface of the material container 1 at the material preheating position 33 and the exhaust gas duct 21 provided on the furnace lid 19 of the arc furnace 2, Are connected, and the exhaust gas from the arc furnace 2 is introduced into the material container 1. Further, at the material preheating position 33, there is provided an exhaust gas discharging means for discharging exhaust gas from the material container 1. In this embodiment, as shown in FIG.
The exhaust gas outlet duct 7 is arranged below the material container 1 at the material preheating position 33. Seal member b of material container 1
14 and the sealing member a13 of the exhaust gas outlet duct 7 are fitted to each other to seal the exhaust gas so as not to leak outside. In this embodiment, the openable gate 1 at the bottom of the material container 1 is used.
Numeral 7 is comb-shaped so that exhaust gas can flow through the openable gate 17, and exhaust gas from the material container 1 is discharged to the exhaust gas outlet duct 7 through the comb-shaped opening of the openable gate 17. , And further guided to the dust collector 20. As the exhaust gas discharging means, an exhaust gas outlet may be provided in the material container 1 separately from the openable gate 17, and the exhaust gas outlet may be connected to the dust collection duct at the material preheating position 33. In this case, since high-temperature exhaust gas does not pass through the openable gate 17, there is an advantage that the openable gate 17 is not exposed to a high temperature. Further, if all of the exhaust gas from the arc furnace 2 is used for preheating the charged material 18, the preheating may be excessive. In this case, a bypass duct connected to the exhaust gas outlet duct 7 may be provided in the exhaust gas inlet duct 6 of the material container 1 so that surplus exhaust gas may be discharged from this bypass duct. May be provided, and a part of the exhaust gas guided to the material container 1 may be exhausted without being used for preheating the charged material.

The preheating of the charge in the process according to the invention is carried out in the following procedure. The material container 1 is arranged at the material input position 32 by the movement of the moving device 3, the input bucket 8 on which the charged material 18 is loaded is suspended by the crane 9, and the input bucket 8 is disposed above the material container 1. Next, the charging material 18 is charged from the charging bucket 8 into the material container 1. In this embodiment, the bottom of the charging bucket 8 is constituted by an openable gate,
The charge 18 is discharged into the material container 1 by opening the openable gate. Since the material charging position 32 is located lower than the arc furnace interior charging position 31, the lift of the crane 9 can be reduced as compared with the conventional apparatus.

Next, the material container 1 is moved to the material preheating position 33. In the present embodiment, since the material input position 32 and the material preheating position 33 are the same position, there is no need to move.
The exhaust gas duct 21 provided on the furnace lid 19 of the arc furnace 2 is connected to the exhaust gas inlet duct 6 of the material container 1, and the material container 1 is connected to the exhaust gas outlet duct 7. Since the top of the material container 1 is open for charging the material, it is effective to carry out preheating after placing the container lid 12 so that the exhaust gas during preheating does not leak outside. The high-temperature exhaust gas generated in the arc furnace is introduced into the material container 1 via the exhaust gas inlet duct 6, and the charged material in the material container is heated.
The exhaust gas heating the charged material is discharged out of the system via the exhaust gas outlet duct 7 and the dust collector 20.

When the preheating of the charging material 18 is completed, the connection between the exhaust gas inlet duct 6 and the exhaust gas duct 21 of the furnace lid is cut off, and the material container 1 is moved by the lifting / lowering device 4 and the swivel device 5.
And the material container 1 is arranged at the arc furnace interior entry position 31 above the arc furnace 2. Furnace lid 12 of arc furnace 2
Is opened before the material container 1 turns. When the material container 1 reaches the arc furnace interior charging position 31, the openable gate 17 of the material container 1 is opened to charge the charging material 18 into the arc furnace.

[0021]

The charging crane for charging the charging material into the material container by lowering the position of the material container when charging the charging material into the material container is lower than the position of the material container in the arc furnace interior charging position. Can lower the lift,
It has become possible to drastically reduce the equipment costs of incidental equipment.
In addition, by adopting a swiveling method as a means for horizontally moving the material container and adopting a moving device having both a swiveling device and an elevating device, a preheating device can be installed in a small space.

[Brief description of the drawings]

FIG. 1 is a front view of an arc furnace charging material preheating apparatus of the present invention when a material container is at an arc furnace interior charging position.

FIG. 2 is a front view of the arc furnace charging material preheating apparatus of the present invention when the material container is at a material charging position and a material preheating position.

FIG. 3 is a plan view of the arc furnace charging material preheating apparatus of the present invention when the material container is at a material charging position and a material preheating position.

FIG. 4 is a diagram showing an arc furnace charging material preheating apparatus according to the present invention.
It is an A 'arrow side view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Material container 2 Arc furnace 3 Moving device 4 Lifting device 5 Swivel device 6 Exhaust gas inlet duct 7 Exhaust gas outlet duct 8 Input bucket 9 Input crane 10 Guide roll 11 Elevating cylinder 12 Container lid 13 Sealing member a 14 Sealing member b 15 Guide Post 16 Arm 17 Openable gate 18 Charge material 19 Furnace lid 20 Dust collector 21 Exhaust gas duct 31 Arc furnace interior entry position 32 Material input position 33 Material preheating position

Claims (5)

[Claims] 1. A method for preheating a charged material in an arc furnace in which a material to be charged into an arc furnace is preheated in a material container by utilizing sensible heat of exhaust gas from the arc furnace, wherein the material container is disposed in a horizontal direction and a vertical direction. It is configured to be able to move between the arc furnace interior entry position, the material input position and the material preheating position, and to be able to move up and down, the material input position is below the arc furnace interior entry position, and the material container is The charged material is placed in the material container from the top by placing the material in the material charging position, and then the arc furnace exhaust gas is introduced into the material container at the material preheating position to preheat the charged material. Characterized in that a material container is arranged at the inside of the arc furnace, the material container is arranged above the arc furnace, and a charged material is charged from the material container into the arc furnace. Material preheating method. 2. The method for preheating a charged material of an arc furnace according to claim 1, wherein the material charging position and the material preheating position are the same position. 3. A material container for preheating a material to be charged into an arc furnace by utilizing sensible heat of exhaust gas from the arc furnace,
A moving device for moving the material container horizontally and vertically between an arc furnace interior entry position, a material input position and a material preheating position, and a moving device for raising and lowering the arc furnace exhaust gas at the material preheating position to the material container. Exhaust gas introducing means for introducing and exhaust gas discharging means for discharging exhaust gas from the material container, the material input position is below the arc furnace interior entry position, and the material container at the arc furnace interior entry position is Located above the arc furnace,
An apparatus for preheating a charged material in an arc furnace, wherein the material container has a discharge means for discharging the material downward from a bottom portion thereof. 4. An apparatus for preheating a charged material for an arc furnace according to claim 3, wherein the material charging position and the material preheating position are the same position. 5. A charging material preheating apparatus for an arc furnace according to claim 3, wherein the horizontal movement is a swiveling movement about a fixed axis. Preheating device.