JPH0694567B2 - Raw material charging device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a raw material charging device for charging raw materials into a blast furnace for producing pig iron, a vertical furnace for metallurgy and refining.

[0002]

2. Description of the Related Art Conventional raw material charging apparatuses include a parallel bunker type and a center feed type.

FIG. 9 shows an example of a parallel bunker type raw material charging device.

In the figure, reference numeral 1 denotes a furnace such as a smelting furnace for producing pig iron or a vertical furnace for metallurgy / refining. A raw material 3 is alternately supplied to the upper portion of the furnace 1 by a switching chute 2 and a pressure adjusting means (not shown) is provided. The two parallel bunkers 4 and 5 whose internal pressure can be adjusted by means of the bunker 4 and the distribution chute 6 in which the raw material 3 from the two bunkers 4 and 5 are horizontally swung and vertically swingable inside the furnace 1. A raw material charging device 9 is constituted by a collecting hopper 7 for leading to the hopper and a driving device 8 for horizontally rotating and vertically swinging the distribution chute 6.

Reference numeral 10 is a seal valve provided at the upper ends of the bunkers 4 and 5, 11 is a flow rate adjusting gate provided at the lower ends of the bunker 4 and 5, and 12 is a seal valve.

When charging the raw material 3 into the furnace 1, first, the pressure inside the bunker 4 is kept at atmospheric pressure by a pressure adjusting means (not shown) while the seal valves 10 and 12 on the bunker 4 side are kept closed. After lowering the temperature, the seal valve 10 on the bunker 4 side is opened to supply the raw material 3 from a raw material tank (not shown) to the bunker 4, and after the supply is completed, the seal valve 10 on the bunker 4 side is closed.

Next, the pressure inside the bunker 4 is raised to a pressure equal to the pressure inside the furnace 1 (pressure equalizing operation) by a pressure adjusting means (not shown), the seal valve 12 at the lower end of the bunker 4 is opened, and then the flow rate adjusting gate 11 is opened. pre-set opening or
Open in.

Then, the raw material 3 inside the bunker 4 is guided to the distribution chute 6 through the collecting hopper 7, and the driving device 8
It is charged into the furnace 1 by the distribution chute 6 which is horizontally swung and vertically swung by.

During the charging of the raw material 3 into the furnace 1 from the inside of the bunker 4, the raw material 3 is supplied to the bunker 5 in the same manner as described above, and thereafter, the bunker 4 and 5 are alternately used to supply the inside of the furnace 1. The raw material 3 is charged into.

Further, FIG. 10 shows an example of a center feed type raw material charging device. A raw material conveyor 12 for carrying a raw material 3 from a raw material tank (not shown) is arranged above the furnace 1 and the raw material conveyor 12 is provided. An upper bunker 14 having a raw material gate 13 at the lower end is provided at the lower part of the upper bunker 14
An upper seal valve 15 is arranged at the upper end of the lower part of the container, and a raw material control gate 16 and a lower seal valve 18 are arranged at the lower end.
And a lower bunker 17 whose internal pressure can be adjusted by a pressure adjusting means (not shown).

When the raw material 3 is charged into the furnace 1, first, with the raw material gate 13 and the upper seal valve 15 at the lower end of the upper bunker 14 closed, a raw material tank (not shown) passes through the raw material conveyor 12. Raw material 3 into upper bunker 1
Supply to 4.

Next, with the raw material control gate 16, the lower seal valve 18, and the upper seal valve 15 at the lower end of the lower bunker 17 closed, the pressure inside the lower bunker 17 is reduced to atmospheric pressure by a pressure adjusting means (not shown). Pressure operation), the upper seal valve 15 and the raw material gate 13 are sequentially opened, and the raw material 3 inside the upper bunker 14 is moved to the lower bunker 17
Supply to.

Thereafter, the raw material gate 13 and the upper seal valve 15 are closed in order, and the pressure inside the lower bunker 17 is raised to a pressure equal to the pressure inside the furnace 1 (pressure equalizing operation) by a pressure adjusting means (not shown). 18 is opened, and then the raw material control gate 16 is adjusted to a preset opening according to the operating state of the furnace 1.

Then, the raw material 3 inside the lower bunker 17 is charged into the furnace 1 through the distribution chute 6.

During the charging of the raw material 3 from the lower bunker 17, for example, another type of raw material 3 different from the above is supplied into the upper bunker 14 in the same manner as described above, and thereafter, the above is repeated to the inside of the furnace 1. The raw material 3 is charged.

FIG. 11 shows another example of the center-feed type raw material charging device, in which a rotary chute 19 is arranged above the upper bunker 14 and plural raw material gates 13 at the lower end of the upper bunker 14 are provided. It is a thing.

[0017]

However, the above-mentioned conventional raw material charging device has the following problems.

That is, in the parallel bunker type raw material charging device, since the raw material 3 is fed from the two bunkers 4 and 5 arranged in parallel through the collecting hopper 7 to the distribution chute 6, the distribution is performed. Since the raw material 3 entering the chute 6 has a horizontal motion component when passing through the collecting hopper 7,
There was a problem that the distribution of the raw material 3 in the furnace 1 was not uniform all around, and it was difficult to maintain a uniform and stable operation all around.

Further, in the center feed type raw material charging device, the lower bunker 17 is uniformly distributed in series until the raw material 3 supplied to the upper bunker 14 is charged into the furnace 1 through the lower bunker 17. Since pressure adjustment such as pressure operation and exhaust pressure operation is required, there is a problem that one charging cycle becomes long, and large-sized sintered ore and small-sized sintered ore are separately charged as the raw material 3. In the case where it is desired to charge a plurality of types of raw materials 3 in order, for example, in the case where the high-grade coke and the low-grade coke are separately charged, that is,
When the charging process of a predetermined amount of raw material is completed by performing the charging cycle for each raw material 3 multiple times, the charging process requires a long time.

Further, the phenomenon of hanging the raw material 3 inside the furnace 1 (the raw material 3 is burned, reduced or melted in the furnace 1 to decrease, but sometimes the raw material 3 is locked above each other in the furnace 1). A phenomenon in which the shelves are held together by being restrained and the apparent raw material level is kept constant by the shelves) occurs, the shelves of the raw material 3 collapse, and the raw material level inside the furnace 1 drops sharply. In case of accident, a large amount of raw material 3 is urgently placed in the furnace 1.
However, it is difficult to deal with this, that is, the overfilling ability is low, because one cycle time is long as described above.

In view of the above-mentioned circumstances, the present invention ensures uniform charging of raw materials in the circumferential direction of the furnace and charging of ore or coke with a plurality of kinds of raw materials dividedly. It is an object of the present invention to provide a raw material charging device capable of achieving both shortening of the charging process and improvement of overfilling ability.

[0022]

According to a first aspect of the present invention, the upper and lower ends can be opened and the lower end can be opened and closed inside an outer bunker having a flow control gate at the lower end and capable of storing raw materials therein. The raw material charging device is characterized in that at least one internal bunker capable of storing a raw material different from that of the external bunker is arranged concentrically with the opening and closing body.

According to a second aspect of the present invention, the raw material apparatus according to the first aspect is arranged so that the opening of the upper end of the inner bunker is smaller than the central diameter of the inner bunker and can be opened and closed by a conical opening / closing body that can be raised and lowered. It is related to the input device.

According to the third aspect of the invention, a tapered narrowed portion is formed at the lower end of the inner bunker, the diameter of which decreases as it goes downward.
The raw material charging apparatus according to claim 1 or 2, wherein the opening / closing body at the lower end of the inner bunker has an inclined surface that expands in diameter downward and becomes larger than the opening at the lower end of the inner bunker.

[0025]

According to the invention of claim 1, since the outer bunker and the inner bunker are concentrically arranged, it is possible to charge a plurality of raw materials with one pressure equalizing and discharging operation of the lower bunker.

According to the invention of claim 2, the inclined surface of the conical opening / closing body allows the raw material between the outer bunker and the inner bunker and the raw material inside the inner bunker to be evenly distributed in the circumferential direction.

It is also possible to switch to store an arbitrary amount of raw material between the outer bunker and the inner bunker and in the inner bunker.

According to the third aspect of the present invention, the opening / closing body provided at the lower end of the inner bunker has a conical surface whose diameter increases as it goes downward and becomes larger than the opening at the lower end of the inner bunker. The material between the opening and the closing body is prevented from being caught and the bridge is opened, and the opening at the lower end of the internal bunker is surely opened and closed. Moreover, since the raw material can be uniformly supplied to the flow control gate from the entire circumference, the horizontal motion component of the raw material can be equalized, and the raw material to be distributed in the furnace through the distribution chute can be distributed in the circumferential direction. A uniform distribution can be achieved.

[0029]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show a first embodiment of the present invention.

Above the furnace 20 such as a smelting furnace for pig iron production and a vertical furnace for metallurgy and refining, a raw material 2 from a raw material tank (not shown) is provided.
A raw material conveyor 23 that feeds the raw materials 1 and 22 is disposed, and a swirl chute 24 and an upper bunker 25 that can horizontally distribute the raw materials 21 and 22 are disposed below the raw material conveyor 23. ing.

The upper bunker 25 has a hollow cylindrical shape with upper and lower ends opened, and a tapered narrowed portion 26 is formed at the lower end as the diameter goes downward, and a raw material gate 27 is provided at the lower end opening. The outer bunker 28 provided is arranged concentrically inside the outer bunker 28 via a support frame 29, has a hollow cylindrical shape with upper and lower ends opened, and a tapered narrowed portion 30 is formed at the lower end. In addition, it is constituted by an inner bunker 32 in which a conical bell 31 is openably and closably provided at a lower end opening, and the turning chute 24 is provided with an outer bunker 28 and an inner bunker 3 by a damper (not shown).
2 is provided with two outlets 33, 34 capable of selectively supplying two kinds of raw materials 21, 22.

A lower bunker 45 is provided below the upper bunker 25. The lower bunker 45 has a hollow cylindrical shape and has an upper seal valve 35 at the upper end opening.
In addition, a tapered throttle portion 36 that reduces in diameter as it progresses downward is formed at the lower end, and a flow adjustment gate 37 and a lower seal valve 49 whose opening degree can be adjusted are provided at the lower end opening. An external bunker 38 whose internal pressure can be adjusted by adjusting means is provided. Internal bunker 4
The outer bunker 38 is provided with a vent hole 71 for equalizing and exhausting pressure.

The lower bunker 45 is concentrically arranged inside the outer bunker 38 via a support frame 39, has a hollow cylindrical shape, and has a tapered squeeze whose diameter decreases toward the upper end as it goes upward. An opening / closing body 41 (hereinafter referred to as a stone box 41) such as a conical stone box having a portion 40 formed therein and having an inclined surface 68 that is substantially continuous with the narrowed portion 40 is protruded from the upper end opening 67 and can be stored. A tapered throttle portion 42 is provided at the lower end of the inclined surface 7 and has a diameter that decreases as it goes downward, and an inclined surface 7 that expands at the lower end of the lower end and becomes larger than the lower end opening 69.
An internal bunker 44 provided with an opening / closing body 43 (hereinafter referred to as a bell 43) such as a conical bell having 0 is provided.

The bell 31 of the upper bunker 25 and the stone box 41 and the bell 43 of the lower bunker 45 are shown in FIG.
As shown in FIG. 3, the supporting frames 29 and 39 are supported so as to be able to move up and down via lifting devices 46 and 47 such as cylinders.

The turning chute 24 and the upper bunker 25
And the lower bunker 45 are arranged so as to share the same axis center line. Reference numeral 50 in the figure denotes a fixed stone box fixed to the support frame 29 of the upper bunker 25 so as to be positioned directly below the discharge port 34 of the turning chute 24.

Next, the operation will be described.

First, the material gate 27 of the upper bunker 25
With the bell 31 closed, a damper (not shown) provided inside the swirling chute 24 is switched to the discharge port 33 side, and the raw material 21 from the raw material tank (not shown) is horizontally swung through the raw material conveyor 23. It is thrown into the turning chute 24.

Then, the raw material 21 introduced into the turning chute 24 is uniformly supplied to the space between the outer bunker 28 and the inner bunker 32 of the upper bunker 25 through the discharge port 33 of the turning chute 24. .

When a predetermined amount of the raw material 21 is supplied to the space between the outer bunker 28 and the inner bunker 32, a damper (not shown) provided inside the turning chute 24 is switched to the discharge port 34 side, whereby Is another raw material 22 from a different raw material tank, for example, fine-grained sintered ore if the raw material 21 is a large-grained sinter, low-grade coke if it is a high-grade coke, a raw material conveyor 23 and a turning chute in the same manner as described above. It is supplied to the inside of the internal bunker 32 via 24.

When the raw material 22 is supplied to the inside of the inner bunker 32, the pressure inside the lower bunker 45 is adjusted by the pressure adjusting means (not shown) with the upper seal valve 32, the lower seal valve 49 and the flow control gate 37 closed. The internal bunker 4 is lowered by lowering it to atmospheric pressure (exhaust pressure operation), and further raising and lowering the stone box 41 and the bell 43 to the positions shown by solid lines.
The upper seal valve 35 is opened with the upper and lower end openings 67 and 69 of the No. 4 closed, and then the material gate 27 of the upper bunker 25 is opened.

[0042] Then, the raw material 21 between the external bunker 28 and the inner bunker 32 of the upper bunker 25, first, the original
It falls onto the stone box 41 of the lower bunker 45 through the charge gate 27 and the upper seal valve 32, is guided by the inclined surface 68 of the stone box 41, and is supplied to the space between the outer bunker 38 and the inner bunker 44. .

At this time, since the inclined surface 68 which is substantially continuous with the narrowed portion 40 of the internal bunker 44 is formed in the stone box 41, the raw material 21 is uniformly supplied to the space along the inclined surface 68 in the circumferential direction.

When the raw material 21 is removed from the space between the outer bunker 28 of the upper bunker 25 and the inner bunker 32, this time, the bell 41 of the lower bunker 45 is lowered to the position indicated by the phantom line to open the upper end opening 67, and , The bell 31 of the upper bunker 25 is lowered to a position indicated by an imaginary line.

As a result, the lower end of the inner bunker 32 of the upper bunker 25 is opened, and the raw material 22 stored inside the inner bunker 32 is passed through the bell 31, the raw material gate 27 and the upper seal valve 35 to the inner bunker 45. Four
4 is supplied.

When the raw material 22 disappears from the inner bunker 32 of the upper bunker 25, the raw material gate 27 of the upper bunker 25 is closed, then the upper seal valve 35 is closed, and the pressure of the lower bunker 45 is adjusted by a pressure adjusting means (not shown). Raise the pressure to the inside of the furnace 20 (equal pressure operation), then,
The lower seal valve 49 is opened, and then the flow control gate 37 of the lower bunker 45 is opened.

Then, the raw material 21 supplied to the space between the outer bunker 38 of the lower bunker 45 and the inner bunker 44 first drops onto the distribution chute 48 via the flow control gate 37 and the lower seal valve 49. And distribution chute 48
From the inside into the furnace 20.

When the raw material 21 between the outer bunker 38 of the lower bunker 45 and the inner bunker 44 is exhausted, the bell 43 is lowered to the position shown by the phantom line to open the lower end opening 69, and the raw material 22 of the inner bunker 44 is bellowed. It is charged into the furnace 20 through 43, the flow control gate 37, the lower seal valve 49, and the distribution chute 48.

At this time, since the bell 43 has the inclined surface 70, the raw material 22 drops from the inner bunker 44 in a state where the raw material 22 is evenly dispersed in the circumferential direction.

Once the raw material 22 is charged into the furnace 20,
One charging cycle is completed.

Then, the raw material 2 from the lower bunker 45
While charging 1 and 22 to the furnace 20, the next charging cycle is started by supplying the raw material to the upper bunker 25 in the same manner as described above.

At this time, in the lower bunker 45, since the inner bunker 44 is concentrically and doubly arranged inside the outer bunker 38, the raw materials 21 and 22 do not have uneven horizontal motion components, It can be dropped from the flow control gate 37 to the distribution chute 48 which is horizontally swung and vertically swung, so that the distribution of the raw materials 21, 22 in the circumferential direction of the furnace 20 becomes stable and reliable, and the raw materials 21, It is possible to load 22 into the furnace 20 evenly in the circumferential direction.

In the lower bunker 45, since the inner bunker 44 is concentrically provided inside the outer bunker 38, two kinds of raw materials 2 can be placed in the furnace 20 in one charging cycle.
1,2 can be charged, and the raw material 2
Since the number of pressure equalizing operations and exhaust pressure operations required at the time of charging 1, 2 and 22 is reduced by half, the charging process and time are shortened, so that the overfilling capacity (the amount of the furnace 20 which is larger than that in the steady state) can be reduced. The ability to load the raw materials 21 and 22) is improved.

Further, the inner bunker 4 of the lower bunker 45
Since the bell 43 having the inclined surface 70 that expands in diameter as it goes downward and expands from the lower end opening 69 is provided to be openable and closable in the lower end opening 69 of No. 4, the raw material 22 is caught between the lower end opening 69 and the bell 43. Also, the bridge is unlikely to occur, and the lower end opening 69 can be opened and closed reliably.

FIGS. 4 and 5 show a second embodiment of the present invention, in which a partition plate 51 extending in the radial direction of the upper bunker 25 is used to store a plurality (two types) of raw materials 21 and 22. Except that the distribution chute 24 having one discharge port is provided above the upper bunker 25 by partitioning into 52 and 53, the configuration is almost the same as that of the above-mentioned embodiment, and the same action and effect can be obtained. .

Incidentally, the raw materials 21,
When 22 is charged, the rotation of the distribution chute 24 is stopped and the outlet is stopped above either one of the chambers 52 and 53. Alternatively, the raw material dropping position is moved continuously or intermittently in order to evenly distribute it in the chamber 52.

Further, in the figure, 54 and 55 are the chambers 52 and 53 and the original chamber.
The material gate is provided between the material gate 27 and the material gate 27.

FIGS. 6 to 8 show a third embodiment of the present invention. Inner bunkers 56, 57 and 58, 59 are provided inside outer bunker 28, 38 for upper bunker 25 and lower bunker 45, respectively. Are doubled to store three kinds of raw materials 60, 61 and 62, and 60, 6 from the outer raw material
Except that the furnace 20 can be charged in the order of No. 1 and No. 62 , the furnace 20 has almost the same configuration as that of the above-described embodiment, and the same operation and effect can be obtained.

In this case, the bells 63 and 64 of the upper bunker 25 and the lower bunker 45 have a double structure as shown in FIGS. 7 and 8, and are lifted and lowered by lifting devices 65 and 66 such as cylinders. It is supported so that it can be discharged from the outer raw material in the order of 60 , 61 and 62.

The present invention is not limited to the above-mentioned embodiment, but multiple internal bunker may be provided so that a large number of raw materials can be charged, and the structure of the upper bunker is arbitrary. That is, it is possible to omit the upper bunker and directly introduce the raw material onto the stone box 41 from the conveyor and the conveyor chute. Of course, various changes can be made without departing from the scope of the present invention.

[0061]

As described above, according to the invention of claim 1, a uniform chargeability of the raw material in the circumferential direction in the furnace is ensured, and a plurality of kinds of raw materials are provided for one or both of ore and coke. It is possible to achieve the excellent effect that both the shortening of the charging process in the case of separately charging and the improvement of the overfilling ability accompanied by it can be achieved. According to the invention of claim 2, the conical opening / closing body makes the raw material even It is possible to obtain an excellent effect that the material can be dispersed and a predetermined amount of raw material can be stored in the outer bunker and the inner bunker, and according to the invention of claim 3, the inclined surface that is wider than the lower opening of the inner bunker is formed. The provided opening / closing body prevents the raw material from being caught and bridged between the lower end opening and the opening / closing body, can reliably open and close the lower end opening, and can uniformly supply the raw material to the flow control gate from the entire circumference. Raw water An excellent effect in the circumferential direction uniform distribution of the material to be distributed into the furnace through a distribution chute allows equalization of movement components can be achieved.

[Brief description of drawings]

FIG. 1 is an overall side sectional view of a first embodiment of the present invention.

FIG. 2 is a front view showing a lifting mechanism portion of the bell and the stone box of FIG.

FIG. 3 is a side view showing a lifting mechanism portion of the bell and the stone box of FIG.

FIG. 4 is an overall side sectional view of a second embodiment of the present invention.

5 is a view taken along the line VV of FIG.

FIG. 6 is an overall side sectional view of a third embodiment of the present invention.

FIG. 7 is a front view showing a lifting mechanism portion of the bell and the stone box of FIG.

FIG. 8 is a side view showing a lifting mechanism portion of the bell and the stone box of FIG.

FIG. 9 is a schematic overall side sectional view of a conventional parallel bunker type raw material charging device.

FIG. 10 is a schematic overall side sectional view of a conventional center feed type raw material charging device.

FIG. 11 is a schematic side sectional view of another example of a conventional center feed type raw material charging device.

[Explanation of symbols]

 21,22,60,61,62 Raw material 37 Flow control gate 38 External bunker 40,42 Throttling part 41 Opening / closing body (stone box) 43,63,64 Opening / closing body (bell) 44,58,59 Internal bunker 67 Upper end opening 68 , 70 Inclined surface 69 Lower end opening

Claims (3)

[Claims] 1. An outer bunker having a flow control gate at its lower end and capable of storing raw materials therein, has an opening / closing body having openings at its upper and lower ends and capable of opening / closing the opening at its lower end, and an outer bunker inside. Is an internal bunker that can store different raw materials,
At least one or more concentrically arranged raw material charging apparatus. 2. The raw material charging device according to claim 1, wherein the opening of the upper end of the inner bunker is smaller than the diameter of the central portion of the inner bunker and is arranged so that it can be opened and closed by a conical opening / closing body that can be raised and lowered. 3. An inner bunker lower end is formed with a tapered narrowed portion that is reduced in diameter as it goes downward, and an opening / closing body at the lower end of the inner bunker is enlarged as it goes downward and is wider than an opening at the lower end of the inner bunker. A sloped surface that increases in size.
Or the raw material charging apparatus according to 2.