JPS5848828B2 - Raw material charging device for reduction furnace - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a raw material charging device for a reduction furnace, and in particular is a charging device for charging raw materials (iron oxide, etc.) into a reduction furnace such as an upright shaft furnace. A passage is inserted into the furnace from the input port, and a disk-shaped rotary plate is supported at a distance from the outlet of the passage inside the furnace, and while the rotary plate is rotationally driven, the rotational centrifugal force is applied. The present invention relates to a raw material charging device for a reduction furnace, characterized in that the raw material is configured to appropriately distribute the raw material into the furnace.

Conventionally, this type of reduction furnace has an opening equipped with a hopper at the top of the furnace, and raw materials such as iron oxide, which are conveyed by a conveyor etc., are charged or charged into the furnace from the hopper. It is something.

In particular, since the inside of the furnace was filled with reactive gases such as reducing gas, there was a risk that the gas inside the furnace would leak to the outside when raw materials were introduced.

Therefore, in order to prevent the leakage of gas in the furnace, the diameter of the opening is configured to be small.

As described above, since the diameter of the raw material input or charging inlet is small, the raw material charged into the furnace is deposited mainly at the center of the furnace.

In particular, in a reducing furnace, since the reactive reducing gas is supplied into the furnace from the direction of the furnace side wall, reduction in the central portion of the furnace tends to be delayed and reduction occurs faster than in the vicinity of the furnace side wall.

Therefore, it has been desired to distribute more of the raw material toward the inner wall of the furnace to obtain an appropriate flow distribution in the furnace by charging the raw material.

In addition, in conventional equipment, gas inside the furnace leaks to the outside when raw materials are charged, so in order to prevent this gas from leaking out, an opening/closing lid, etc. is installed at the inlet or charging inlet, and the lid is opened and closed at a constant rate. A batch method is generally adopted in which the material is charged in small quantities.
On the other hand, when raw materials are continuously charged into the furnace, it is necessary to provide complicated airtightness means, which has the disadvantage of complicating the structure.

Therefore, in view of the problems of the conventional apparatus, the present inventor has conducted intensive research and has completed the present invention in order to effectively solve these problems.

The object of the present invention is to provide a passage connected to the raw material input port at the top of the furnace from the input port into the furnace, support a rotary plate at a distance directly below the passage, and centrifuge the rotary plate. By distributing the raw material into the furnace by force, it is possible to continuously charge or charge the raw material while properly distributing it in the furnace, and to properly distribute the flow of the raw material in the furnace, and to improve the flow of the furnace. Provided is a raw material charging device for a reduction furnace that can be operated continuously.

Further, the object of the present invention is to provide a passage connected to the input port at the top of the furnace, support a rotary plate directly below the passage, and transfer the raw materials input from the input port between the passage and the rotary plate. To provide a raw material charging device for a reduction furnace which can constantly retain the reducing gas inside the furnace, minimize leakage of reducing gas outside the furnace, and easily maintain airtightness near the charging port.

Furthermore, an object of the present invention is to provide a raw material charging device for a reduction furnace that can automatically adjust the amount of raw materials charged into the furnace and also perform continuous charging by adjusting the rotational speed of the rotary plate. I will provide a.

Another object of the present invention is to provide a raw material charging device for a reduction furnace that has an extremely simple structure, is easy to maintain and inspect, and can be easily installed in conventional furnaces of this type.

Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a longitudinal sectional front view of a reduction furnace equipped with an apparatus according to the present invention, FIG. 2 is a plan view of a rotary plate used in this apparatus, and FIG.
The figure is a longitudinal sectional front view showing a modified embodiment, and FIG. 4 is a side sectional view showing another embodiment of the drive device.

As shown in FIG. 1, a circular opening 3 is provided in the center of the top 2 of the upright shaft furnace 1.

A cylindrical body 5 having a flap 4 on its upper part is attached to this opening 3.

This cylindrical body 5 forms a passage 6 facing into the furnace 1 from the opening 3.

This passage 6 is vertically defined within the cylindrical body 5 by supporting a L-inner cylindrical body 7 having a small diameter.

The upper surface opening 8 of the hopper 4 provided at the upper part of the cylinder 5 is covered with a cover plate 9 except for the part inserted into the cylinder 5, and the cover plate 9 has a raw material input port 10. As shown in the figures, two conveyors 11, 11 for conveying the raw materials are located above the input ports io, io, respectively.

The lower part of the passage 6 is open, and the cylindrical body 5 is placed in a higher position and the inner cylindrical body 7 is opened.
extends to a lower level to form a discharge port 12 at the bottom of the passage 6.

Directly below the lower discharge port 12 of the passage 6, a rotary plate 13 is supported at a predetermined distance.

The rotary plate 13 is constituted by a disk having a diameter larger than the cross-sectional area of the passage 6, and an upright shaft member 14 is integrally installed in the center thereof.

The upper part of the shaft member 14 passes through the inner cylindrical body 7 and projects onto the cover plate 9 that covers the hopper 4.

In this way, the lower end of the cylinder 5 forming the passage 6 and the rotating plate 1
The discharge port 12, which is open on the circumference, is formed between the upper surfaces of the discharge ports 3 and 3.

Several baffle plates 22 are installed above the discharge port 12 to prevent the raw material from rotating idly on the disk 13 and also to serve as reinforcement.

On the other hand, the furnace top 2 including the hopper 4 is surrounded by a seal box 17, and the seal box 17 is supported on the furnace top 2,
Conveyor 1 described above 1. , 1 1 is also provided.

The center of the upper plate 15 of this seal box 17 is opened, and the upper end of the shaft member 14 protrudes onto the upper plate 15 through this opening 16.
6 is supported by a bearing 18 which also serves as a seal member.

Portion 14 of shaft member 14 protruding above seal box 17
a is connected to the drive device 19.

Therefore, when the shaft member 14 is rotationally driven, the rotating plate 13 is rotated.

The driving device 19 may be, for example, a ring gear transmission system using a motor, a motor chain, a sprocket transmission system, etc., but the essential point is to drive the shaft member 14 in rotation.
If it is configured so that it can rotate freely in forward and reverse directions, and the rotational speed can be controlled variably, then it is acceptable.

Therefore, the drive device 19 can also be configured as shown in FIG.

FIG. 4 shows the upper part 14a of the shaft member 14 and the seal box 17.
A seal member 21 is inserted into the gap between the shaft member 14, a ring gear 23 is fitted and fixed near the upper end of the shaft member 14, and the ring gear 23 is rotatably supported by a bearing member 18.

A gear 24 rotationally driven by a drive device 25 such as a motor is meshed with the ring gear 23, and the shaft member 14 is thereby rotated.

Further, the shaft 14 is structured to be movable in the vertical direction, so that the optimum distribution can be selected.

As shown in FIG. 2, the rotating plate 13 is made of a disk-shaped flat plate, and on its surface, that is, the surface facing the discharge port 12, there are grooves 2 radially extending in the radial direction around the shaft member 14 that stands upright.
0 is engraved (・ru.

Next, a modified embodiment shown in FIG. 3 will be described.

As shown in the figure, an opening 3 is provided at the top of the furnace 2, and a cylindrical body 5 is inserted into the opening 3 to form a passage 6.

A hopper 4 is provided in the upper part of the cylinder 5 forming the passage 6, and a discharge port 12 is formed in the lower part.

A cover plate 9 is provided at the upper opening 8 of the hopper 4 to cover it.

Further, this cover plate 9 is provided with raw material input ports 10, 10 as in the embodiment shown in FIG. 1, and the terminal ends of conveyors 11, 11 for conveyance are located.

Directly below the lower discharge port 12 of the passage 6, a rotary plate 13 is supported at a constant interval.

A driving means 19a is provided on the lower surface of the rotary plate 13,
The rotating plate 13 is configured to be able to be variably driven.

The driving means 19a rotates and supports the rotary plate 13 through a transmission member such as a roller or the like.

Further, the furnace top 2 including the hopper 14 has a seal box 17
Surrounded by ℃・ru.

Next, a method of operating the apparatus having the above configuration will be explained in detail.

Iron oxide pellets, which are the raw material W, are conveyed by conveyors 11, 11, and are continuously thrown into the hopper 4 on the input ports 10, 10.

The input raw material W is guided by the inclined surface of the hopper 4 and reaches the upper part of the passage 6, and then sequentially descends to reach the rotary plate 13.

Further, since a constant gap L is provided between the passage lower discharge port 12 and the rotary plate 13, the raw material W flowing out from the passage 6 onto the rotary plate 13 forms an angle of repose θ.

While continuously charging the raw material W through the charging port 10, the rotating plate 13 is driven to rotate, and the raw material W is distributed and charged into the furnace 1 by its centrifugal force.

When charging the raw material W toward the inner wall of the furnace, the rotating plate 1
30 Increase the rotation speed. On the other hand, when distributing and charging the central part of the furnace, the rotation speed is set to be low.

In this way, while variably controlling the rotational speed of the rotary variable 130, the raw materials are dispersed or distributed into the furnace and are continuously charged.

In particular, in a reduction furnace, reduction occurs faster in the direction of the inner wall of the furnace, so by charging more iron oxide pellets, which is the raw material W, in the direction of the side wall, the flow distribution in the furnace can be improved. Can be held properly.

Further, as shown in FIG. 2, by providing grooves 20 on the surface of the rotary plate 130, the frictional force between the raw material and the rotary plate can be increased, and the dispersion flight distance can be increased.

Apart from the example shown in FIG. 2, this rotary plate 13 is different from the one shown in FIG. 2. By selecting its surface roughness and material, the flight distance of the raw material dispersed by centrifugal force can be adjusted.

In this way, by rotationally driving the rotary plate 13, it is possible to suitably distribute and charge the raw material W introduced from the hopper into the furnace, and furthermore, by variably controlling the rotation speed, it is possible to charge the raw material W into the furnace. The charging amount can also be easily and freely adjusted.

Furthermore, there is a certain gap between the rotating plate 13 and the discharge port 12 of the passage 6 to form an angle of repose θ for the raw material W, and the raw material W is always retained between the input hopper 4 and the passage 6. In order to do this, the reduced gas in the furnace 1 is shielded and it is extremely unlikely that it will leak into the inlet 10.

In summary, according to the present invention, a passage is connected to the raw material input port at the top of the furnace, a rotary plate is supported at a distance directly below the passage, and the rotary plate is rotated to feed the raw material into the furnace by its centrifugal force. The raw materials can be charged while being distributed appropriately within the furnace, and the flow distribution of the raw materials within the furnace can be appropriately achieved, and the furnace can be operated continuously.

Further, according to the present invention, it is possible to easily maintain airtightness around the input port depending on the raw materials input.

Further, according to the present invention, by controlling the rotational speed of the rotating plate, the amount of raw materials charged into the furnace can be automatically adjusted and continuously charged.

Further, the present invention exhibits various excellent features such as an extremely simple structure, easy maintenance and inspection, and the ability to be easily installed in a conventional reduction furnace.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional front view showing a raw material charging device for a reduction furnace according to the present invention, and Fig. 2 is a plan view of a rotary plate used in this device.
FIG. 3 is a longitudinal sectional front view showing a modified embodiment, and FIG. 4 is a side sectional view showing another embodiment of the drive device. In the figure, 1 is a reduction furnace, 2 is a furnace top, 10 is an inlet, 6 is a passage, and 13 is a rotating plate.

Claims (1)

[Claims] 1. A passage is connected to the raw material input port at the top of the furnace from the input port into the furnace, and a rotary plate is supported at a distance directly below the passage, so that the raw material is distributed into the furnace by the rotary plate. A raw material charging device for a reduction furnace characterized by the following configuration.