JPH0222409A - Furnace top charging apparatus in blast furnace - Google Patents

Abstract

PURPOSE:To optionally adjust characteristic and charging rate of raw material by communicating one set among three sets of upper raw material storing hoppers with a vertical chute and the other two sets with a swinging chute through an intermediate collecting hopper. CONSTITUTION:Ordinary coke is stored in the hopper 5A in the three sets of the upper raw material storing hoppers, and large grain coke is stored in the hopper 5B and ore is stored in the hopper 5C. The ordinary coke in the hopper 5A is dropped into an eccentric hopper 16 through the lower intermediate collecting hopper 7B and the swinging chute 17 is swung to discharge the ordinary coke. The large grain coke in the hopper 5B is charged into center part in the furnace from a center lower chute 8 and the vertical chute 9. The ore in the hopper 50 is charged into the eccentric hopper 16, and a rotating cylinder 14 and the swinging chute 17 are rotated to charge the ore into the prescribed range at the prescribed thickness. By this method, gas penetration and liquid penetration can be controlled and improvement of the stable operation in the blast furnace can be achieved.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is equipped with a hopper for supplying raw materials to the reactor core, a hopper and a chute that can distributely supply raw materials to the periphery of the reactor and the entire cross section of the reactor, thereby significantly improving performance. This invention relates to an improved blast furnace top charging device.

[Conventional technology]

In recent years, when charging raw materials to blast furnaces, coke, ore, etc. have been charged by particle size. In other words, in an example of charging coke by particle size, coke with large particle size and high strength is charged into the center of the blast furnace, and coke with small particle size is charged into the periphery of the furnace to ventilate the center of the furnace. Methods are being used to improve productivity and ensure stable operation by ensuring water resistance and liquid permeability.

As such a furnace top charging device, Japanese Patent Application Laid-Open No. 49-5270
There is a method in which a rotatable and tiltable raw material distribution chute is provided on the furnace axis as in Publication No. 4, and a method in which a rotatable chute is provided in a position eccentric to the furnace axis as in Japanese Patent Application Laid-Open No. 122407/1983. A method is known in which the chute can be rotated around the furnace axis so that the chute can be distributed to any desired position within the furnace.

[Problem to be solved by the invention]

However, in such a conventional furnace top charging device, there are the following problems when trying to charge raw materials with different particle sizes into the central part and the peripheral part of the blast furnace. That is,
(1) Raw material storage hoppers are usually equipped with two pieces, and one stores ore and the other contains coke, so it is not possible to receive the same raw material by particle size. (2) If one raw material storage hopper Even if raw materials with different particle size configurations are received in layers, it is difficult to control the discharge by particle size configuration when discharging from the hopper into the furnace. (3) Also, suppose
Assuming that the above discharge control is achieved, first, the raw material distribution chute is rotated or tilted so that the raw material can be charged into the center of the furnace, and then the raw material with large particle size is flowed out from the raw material storage hopper. Once the gate valve of the raw material reservoir is closed, the outflow of the fine raw material is stopped. Next, the position of the distribution chute is moved to charge the fine raw material into the peripheral area of the furnace, and the fine raw material flows out from the raw material hopper and is charged into a predetermined position in the furnace. However, such a charging method requires a longer charging time than normal raw material charging, making it difficult to charge a predetermined amount of raw materials into the furnace within a certain period of time. Furthermore, there is a problem in that it is difficult to distribute and distribute the amount with an appropriate particle size structure, as described above.

The present invention has been made in view of such conventional problems, and aims to solve the above problems by providing the raw material hopper with a mechanism such as a vertical chute or an oscillating chute.

[Means to solve the problem]

This invention provides a top charging device for a blast furnace, including three upper raw material storage hoppers having selective charging means, an intermediate collecting hopper that receives raw materials from the upper raw material collecting hoppers, and a coaxial connection to the intermediate collecting hoppers. It consists of a lower fixed cylinder with a lower fixed cylinder, and a rotary cylinder that can rotate coaxially within the lower fixed cylinder and has an eccentric hopper installed therein, and one of the three upper raw material storage hoppers.
The base communicates with a vertical chute provided along the furnace axis direction, and the other two upper material storage hoppers communicate with an oscillating chute provided at the lower end of the eccentric hopper via an intermediate collection hopper. This is a characteristic top charging device for blast furnaces.

[Effect]

Since the present invention is constructed as described above, ordinary coke, large coke, and ore supplied, for example, by a conveyor or the like are respectively received into three upper raw material storage hoppers by selective charging means. At this time, the large coke to be charged into the center of the furnace is received into the upper material storage hopper that communicates with a vertical chute installed along the furnace axis, and the ordinary coke and ore are sent to the other two upper material storage hoppers. Accept them separately.

Therefore, for example, if normal coke is first introduced from the upper raw material storage hopper that receives it into the eccentric hopper via the intermediate collection hopper and then discharged from the swinging chute installed at the lower end of the coke, the swinging chute will rotate with the rotating cylinder. By combining the rotational motion of the hopper and its own swinging motion, a predetermined amount of ordinary coke is distributed and charged over the entire cross section of the furnace, then the large coke is charged through a vertical chute, and then ore is charged. The required amount can be distributed and charged into the furnace within the required range using the oscillating chute in exactly the same way as the normal coke is charged into the furnace from the upper raw material storage hopper. At this time, the vertical chute and the oscillating chute can be operated at the same time, and large coke and ore can be charged at the same time.

[Example] The present invention will be described below based on the drawings. FIGS. 1 to 7 show one embodiment of the present invention, and FIGS. 8 to 10 show other embodiments.

First, the configuration will be explained. Figure 1 is an overall schematic diagram, and 2
3 is a conveyor for carrying in raw materials such as ore and coke, and 3 is a switching chute for sending these raw materials to hoppers separately, and has three distribution chutes 3a, 3b, and 3c. 4 to move left and right. 5A, 5B
, 5C are upper raw material storage hoppers, each having introduction chutes 6A, 6B, and 6C for receiving raw materials. These introduction chutes are the distribution chute 3a of the switching chute which constitutes the selective charging means.

It corresponds to 3b and 3c. 6A1, 6B, and 6CI are seal valves of the introduction chute (6C+ shows the open state in FIG. 1).

Gate valves 5A++ 5B+ and 5G+ are attached to the lower ends of the upper material storage hoppers 5A, 5B and 5C, respectively, and internal chutes 5Az, 5Bz and 5Cz are provided. And these internal shoots 5 A! +5 B.

5Cz is installed in an airtight state in the upper intermediate collecting hopper 7A. 7B is a lower intermediate collecting hopper, which together with the upper intermediate collecting hopper 7A forms the intermediate collecting hopper 7 that is airtightly joined to form a funnel shape as a whole. Communication port between re-gathering hopper 7AlB? a, 7b, and 7a are opened and closed by seal valves 7B7Bz and 7B+. However, the seal valve 7Bz opens and closes the central guide shoe 5B3, and communicates the upper raw material storage hopper 5B to the center of the furnace via the central lower chute 8 and the vertical chute 9 connected thereto.

Reference numeral 10 denotes a lower fixed cylinder, which has an upper flange 11 and a lower flange 12. The upper flange 11 is hermetically bolted to the lower intermediate collecting hopper 7B via a gasket (not shown), etc., and the lower flange 12 is connected to the furnace top. Like the iron skin 13, it is bolted together in an airtight manner (see Figure 2).

14 is a rotating cylinder above the fixed cylinder 10.

Hermetic rotary support 11a of the lower flange 11.12.

12a, and has a vertical chute 9 and a bottom plate 15 through which an oscillating chute (described later) passes through.
It is isolated from the top of the furnace.

In addition, an eccentric hopper 16 is installed inside the lower intermediate collecting hopper 7.
It is formed into a funnel shape that can receive the raw material falling from B and is fixed. Therefore, it is possible to rotate together with the rotating cylinder 14 about the vertical chute 9 as an apparent axis.

17 is an oscillating chute, which is composed of a vertical pipe 17a and an inclined pipe 17b, and the upper end of the vertical pipe 17a is connected to the eccentric hopper 1.
The rotary cylinder 14 is rotatably supported by a rotary support part 16a provided at the lower end of the rotating cylinder 14, and a rotary support part 15a provided at the bottom plate 15 of the rotary cylinder 14 in the middle, and the lower end opens into the furnace (see Fig. 2). .

Next, the rotation mechanism of the rotating cylinder 14 and the swinging chute 17 will be explained based on FIGS. 2 to 6. The rotating cylinder 14 rotates when a ring gear 18 provided on its upper outer periphery meshes with a spur gear 20 attached to a drive motor 19 provided on the upper flange 11 of the fixed cylinder 10 (FIG. 4).

Reference numeral 21 indicates a plurality of guide bars provided in the direction of the outer circumferential generatrix of the rotating cylinder 14. Reference numeral 22 indicates a plurality of guide bars provided in the direction of the inner circumferential generatrix of the lower fixed cylinder 10. Reference numeral 23 indicates a guide bar that is slidable in the vertical direction with respect to the guide bar 21. The slide ring rotates with the rotating cylinder. 24 is a slide piece that can slide vertically on the guide bar 22 on one side, has a groove on the other side that can slide on the slide ring rib 23a, and is attached to the rod 25a of the fluid pressure cylinder 25. It is being

Further, the guide bar 21 has a rack par 26 as shown in FIGS. 2 and 5 whose upper end is fixed to the lower surface of the slide ring 23, and the rack part 26a of this rack par 26 is As shown in Figure 6, the large binion 2
7. Sequentially meshes with the small pinion 28, and then the small pinion 2
A worm 29 is provided on the shaft of 8, and this meshes with a worm wheel 30 attached to the outer periphery of the vertical tube 17a of the swinging chute 17.

Next, the operation will be explained.

For example, according to the present invention, as shown in FIG.
When ore 43 is charged around the ore 43, ordinary coke 41 is introduced from the distribution chute 3a of the switching chute 3 by the conveyor belt 2 and distributed to the upper material storage hopper 5A via the shoe 1-6A and the seal valve 6A. Shoot 3b, 4
Large coke 42 is stored in the material storage hopper 5B via the man chute 6B and seal valve 6B+, and ore 43 is stored in the material storage hopper 5C via the distribution chute 3C2 (introduction shoe) 6C and seal valve 6Cr.

Next, the normal coke 41 falls into the eccentric hopper 16 by opening the gate valve 5A+ of the internal chute 5Az (and opening the seal valve 7B on the left side in FIG. 1 of the lower intermediate collecting hopper 7B). .4 When the cylinder 25 is driven as shown in Fig. 4, the rack bar 26 moves vertically via the rod 25a, slide piece 24, and slide ring 23, and the large pinion 27 and small pinion 28 mesh with the rack bar. As the worm 29° worm wheel 30 rotates, the oscillating chute 17 to which the worm wheel 30 is fixed rotates.The oscillating chute 17 discharges the ordinary coke 41 in the direction of the bending angle of the inclined pipe 17b. Furthermore, if the drive motor 19 is driven at this time and the rotating cylinder 14 is rotated by the meshing of the ring gear 18 and the gear 20, the eccentric hopper 1
6 rotates about the vertical chute 9 as an apparent rotation axis, the discharge trajectory of the ordinary coke 41 is caused to cross the furnace by a combination of the rotational movement of the eccentric hopper 16 and the rotational movement of the oscillating chute inclined pipe 17b. The charging thickness can be partially increased over the entire surface, or it is also possible to charge to an average thickness as shown in FIG.

Next, when the seal valve 7B+ and the gate valve 5A+ are closed and the gate valves 5B, . It is charged only into the center of the furnace through the vertical chute 9. Furthermore, at this time, by simultaneously opening the gate valve 5C+ and the seal valve 7Bl (on the right side), the raw material storage hopper 5C
When the ore is charged into the eccentric hopper 16 and the rotating cylinder 14 and the oscillating chute 17 are rotated, the ore is transferred from the oscillating chute inclined pipe 17b to a predetermined area in the same way as when ordinary coke was charged. Ore can be loaded into the furnace to a certain thickness.

That is, it is possible to charge the ore 43 and the large coke 42 at the same time.

Figures 8, 9, and 10 show another embodiment, which has the same specifications as the previous embodiment except that a tilting chute 47 is used as the oscillating chute, and Figure 9 corresponds to Figure 5. It is.

In the figure, 41 is an extension shaft of the small pinion 28,
Gear wheels 42.42 are attached. - side, tilting tube 47
is provided with a tilting axis 46.46 in the diametrical direction of the tilting tube,
On the extension thereof, a sector gear 45°45 is connected to the gear 42.42.
It is designed to mesh with the 40 is a tilting chute fixed bin.

Here, as in the previous embodiment, the rack bar 26 is moved up and down by the drive of the cylinder 25, so that the pinion 2
7.28 rotates, and the gears 42.42 attached to the small hinge shaft 41 drive the sector gears 45.45, causing the tilting tube 47 to perform simple vibration with a predetermined amplitude. Furthermore, since this simple harmonic motion is combined with the rotational motion of radius 01o2 accompanying the rotation of the rotary circular tube 14, it has almost the same raw material charging action as in the previous embodiment.

〔Effect of the invention〕

As explained above, according to the present invention, (1) the properties and amount of raw materials charged into the reactor core can be arbitrarily adjusted, and the raw materials can also be charged and distributed to arbitrary positions around the reactor; , the ventilation and liquid permeability inside the furnace can be controlled, improving productivity and stable operation of the blast furnace; (2) raw materials can be charged to the core and the surrounding area of the furnace at the same time;
(3) Any material charging can be selected as appropriate depending on the furnace condition; (4) The raw material distribution device has a simple structure overall, and there is no problem between each main part. Since the airtightness is maintained, the driving part of the device is not exposed to furnace top gas, etc., so that effects such as reliable operation of the parts can be obtained.

[Brief explanation of the drawing]

FIG. 1 is an overall schematic diagram of the first embodiment according to the present invention, and FIG.
The figure is an enlarged detailed view of the lower half of Figure 1, and Figure 3 is the second
A view in the direction of the A arrow in the figure, Fig. 4 is a view in the direction of the B-B arrow in Fig. 3,
FIG. 5 is a view taken along the line C-C in FIG. 2, FIG. 6 is a view taken along the line D-D in FIG. FIG. 9 is a partial enlarged view of the second embodiment, FIG. 9 is a view taken along the line EE in FIG. 8, and FIG. 10 is a partial view taken along the line FF in FIG. 9. 5A, 5B, 5C... Upper raw material storage hopper, 7 (
7A, 7B)...Intermediate collection hopper, 9...
... Vertical chute, 10 ... Lower fixed cylinder, 1
4... Rotating cylinder, 16... Eccentric hopper, 17.47... Oscillating chute 17. (
47...Tilt chute). Figure Loco ~ Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure

Claims (1)

[Claims] (1) In a top charging device of a blast furnace, three upper raw material storage hoppers having selective charging means, an intermediate collection hopper that receives raw material from the upper raw material storage hoppers, and a central collection hopper that is coaxially connected to the intermediate collection hoppers are used. It consists of a lower fixed cylinder, which is rotatable coaxially within the lower fixed cylinder, and has an eccentric hopper installed therein, and one of the three upper raw material storage hoppers is installed along the furnace axis direction. Top charging of a blast furnace characterized in that the other two upper raw material storage hoppers are connected to an oscillating chute provided at the lower end of the eccentric hopper via an intermediate collecting hopper. Device.