JPH0421814Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a furnace top charging device, and in particular, a furnace top charging device that improves the structure of the pressure equalizing bunker of a center feed type bellless type furnace top charging device. It is related to the device.

[Prior Art] In recent years, a bellless type furnace top charging device has been adopted as a furnace top charging device used in a blast furnace because it has a large degree of freedom in distributing raw materials in the furnace.

In particular, for the purpose of improving the uniformity of raw material distribution and shortening the raw material supply process, there is a tendency to adopt a center-feed type bellless furnace top charging device in which two bunkers are arranged in two stages, one above the other.

Conventionally, this type of furnace top charging device has been constructed as shown in FIGS. 2 and 3.

In the first conventional example shown in FIG.
In order to prevent pressure from leaking from the blast furnace A and fluctuating the internal pressure of the blast furnace A when raw materials are charged into the blast furnace A, there is a pressure equalizing chamber B partitioned inside the blast furnace A.
A pressure equalizing bunker d is provided to charge raw material c into the blast furnace a while maintaining the internal pressure of the blast furnace a to be equal to the internal pressure of the blast furnace a. A bunker e is further provided above the pressure equalizing bunker d, and this bunker e is of a fixed type or a rotating type. The raw material outlet f of the upper bunker e and the raw material inlet g of the lower pressure equalizing bunker d were located at one location each on the same axis. A raw material supply system i such as a belt conveyor for conveying raw materials c such as ore and coke is installed inside the bunker e, facing the upper opening of the bunker e in the upper stage of the furnace top charging device h configured as described above. It is installed at an angle from the ground. If the upper bunker e is of a fixed type, there is usually a rotating chute (not shown) directly below the raw material supply system i such as the belt conveyor.
is installed.

Furthermore, in the second conventional example shown in FIG.
This differs from the first conventional example in that the raw material outlet f of the upper bunker e and the raw material inlet g of the lower pressure equalizing bunker d that engages with this are each branched into a plurality of parts. .

[Problems to be solved by the invention] By the way, this type of furnace top charging device h has the following problems.

In the first conventional example, the raw material c is received and stored in the upper bunker e while rotating the upper bunker e or operating the rotating chute. By receiving the raw material c in this manner, the coarse particles and fine particles in the raw material c are stored in the upper bunker e in a substantially uniformly mixed state.

However, when the raw material c in the upper bunker e is introduced into the lower pressure equalizing bunker d, separation of the raw material c into coarse particles and fine particles occurs again, and the diameter The raw material c is stored in a segregated state in which coarse grained raw material c is deposited outward in the radial direction and fine grained raw material c is deposited radially inward. Therefore, when the raw material c in this segregated state is charged into the blast furnace a, due to the outflow characteristics of the raw material c, initially the fine grained raw material c in the center of the pressure equalizing bunker d flows out, and gradually the raw material c in the surrounding area flows out. There was a problem in that the coarse-grained raw material c would flow out, and the particle size of the raw material c charged into the blast furnace a would fluctuate over time.

In addition, even in the second conventional example, since the raw material outlet f of the upper bunker e and the raw material inlet g of the lower pressure equalizing bunker d that engage with this are each branched into a plurality of branches, the first Although the segregation state of the raw material c in the radial direction in the pressure equalizing bunker d is improved compared to the conventional example, it is said that it is not possible to prevent fluctuations in the particle size of the raw material c charged into the blast furnace a over time. There was a problem.

In view of the above-mentioned problems, the present invention makes the mixed state of coarse particles and fine particles of the raw material stored in the pressure equalizing bunker uniform, and prevents the particle size of the raw material charged into the blast furnace from changing over time. It is an object of the present invention to provide a furnace top charging device that can charge in a uniformly mixed state without having to do so.

[Means for Solving the Problems] In order to solve the problems in the conventional technology, the present invention has a lower part connected to the charging port of the blast furnace, an upper part connected to the raw material supply system, and a raw material introduction system for introducing the raw materials. A pressure equalizing bunker has a mouth and the inside is sealed to equalize the internal pressure of the blast furnace, and a pressure equalizing bunker is provided inside the pressure equalizing bunker so as to be tiltable and rotatable, and the raw material introduced from the raw material inlet is introduced into the pressure equalizing bunker. It is equipped with a distribution chute for uniformly distributing and storing.

[Function] Since the distribution chute is configured as described above and is provided in the pressure equalizing bunker so as to be tiltable and pivotable,
By tilting this distribution chute, the particle size of the raw material can be adjusted in the radial direction of the pressure equalizing bunker, and by rotating it, the particle size of the raw material can be adjusted in the circumferential direction of the pressure equalizing bunker. There is no variation in particle size of the raw materials charged over time, and the raw materials are charged in a uniformly mixed state.

[Example] An example of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, a pressure equalizing bunker 2 is provided coaxially and in a single stage in the upper part of the blast furnace 1. The lower part of this pressure equalizing bunker 2 is connected to the charging port 3 of the blast furnace 1. Further, the upper part of the pressure equalizing bunker 2 is connected to a raw material supply system 4. This raw material supply system 4 is formed, for example, by a belt conveyor or the like provided inclined from the ground. A raw material inlet 6 is provided in the upper part of the pressure equalizing bunker 2 for introducing raw material 5 such as ore or coke supplied from the raw material supply system 4. This raw material inlet 6 is formed by, for example, a hopper, and its diameter is gradually enlarged upward.
A pressure equalization chamber 7 is partitioned inside the pressure equalization bunker 2, and the pressure equalization chamber 7 is partitioned to prevent pressure from leaking from the blast furnace 1 and fluctuating the internal pressure of the blast furnace 1 when the raw material 5 is charged into the blast furnace 1. In order to keep the internal pressure of the pressure chamber 7 equal to the internal pressure of the blast furnace 1, an upper seal valve 8 and a lower seal valve 9 are provided at the upper and lower parts of the pressure chamber 7, respectively. Further, a distribution chute 10 is provided above the pressure equalization chamber 7 in the pressure equalization bunker 2 so as to be tiltable and pivotable. This distribution chute 10 is connected to a drive mechanism 11 provided outside the pressure equalizing bunker 2. Further, an internal hopper 12 is provided directly above the distribution chute 10 to reliably guide the raw material 5 introduced into the pressure equalizing bunker from the raw material inlet 6 to the distribution chute 10. An upper gate valve 13 is provided at the bottom of the raw material inlet 6, and a lower gate valve 14 is provided at the bottom of the pressure equalization bunker 2, thereby configuring the furnace top charging device 15 of the present invention. .

An in-furnace distribution chute 16 is provided directly below the charging port 3 of the blast furnace 1 so as to be tiltable and rotatable.

Next, the operation of one embodiment of the furnace top charging device of the present invention constructed as described above will be described.

The raw material 5 such as ore or coke, which is transported by the raw material supply system 4 such as a belt conveyor to just above the raw material inlet 6 of the furnace top charging device 15, is transferred to the raw material inlet 6 of the furnace top charging device 15.
is supplied to At this time, an upper gate valve 13 provided at the bottom of the raw material inlet 6 formed in the hopper
is open. In addition, a lower gate valve 14 and a lower seal valve 9 provided at the lower part of the pressure equalizing bunker 2
is closed.

The raw material 5 introduced through the raw material inlet 6 is guided to the distribution chute 10 by an internal hopper 12 provided in the pressure equalizing bunker 2. This distribution chute 10 is tilted and rotated by a drive mechanism 11. This tilting of the distribution chute 10 is caused by the pressure equalizing bunker 2.
It is possible to adjust the particle size of the raw material 5 in the radial direction, and
The rotation makes it possible to adjust the particle size of the raw material 5 in the circumferential direction within the pressure equalizing bunker 2, and makes the deposition form of the raw material 5 variable, thereby improving the degree of freedom in adjusting the raw material distribution. Normally, the raw material 5 is transported directly above the furnace top charging device 15 by a raw material supply system 6 such as a belt conveyor, and during transportation, fine grained raw material 5 falls onto the belt surface and is supplied from the tip of the belt. At the time of separation, the upper layer of the raw material belt is mainly coarse-grained raw material 5, and the lower layer is mainly fine-grained raw material 5, but the raw material 5 separated in this way and supplied to the raw material inlet 6 is also separated. Equal pressure bunker 2
Since the raw material 5 is distributed and fed through a distribution chute 10 provided in the pressure equalizing bunker 2, when it is stored in the pressure equalizing bunker 2, there is little segregation of the raw material 5 into coarse particles and fine particles, and it is stored in a relatively uniformly mixed state. That will happen.

When the raw material 5 is stored in the pressure equalizing bunker 2,
The upper gate valve 13 of the raw material inlet 6 is closed, and the upper seal valve 8 provided at the upper part of the pressure equalizing bunker 2 is also closed. Then, the internal pressure of the pressure equalizing chamber 7 partitioned within the pressure equalizing bunker 2 is maintained equal to the internal pressure of the blast furnace 1. After that, equal pressure bunker 2
The lower gate valve 14 and the lower seal valve 9 provided at the lower part of the bunker are opened, and the raw material 5 in the pressure equalizing bunker 2 is charged into the blast furnace 1. The raw material 5 charged from the pressure equalization bunker 2 to the charging port 3 of the blast furnace 1 is guided to an in-furnace distribution chute 16 provided in the blast furnace 1 so as to be tiltable and rotatable.
are uniformly distributed and charged into the blast furnace 1. Here, the raw material 5 in the pressure equalizing bunker 2 generally first flows out into the blast furnace 1 from the raw material 5 at the lower center in the pressure equalizing bunker 2, and falls in the order of the center, the upper center, and the periphery.
It flows into the blast furnace 1. However, in the present invention, the raw material 5 is stored in the pressure-equalizing bunker 2 in a state with little segregation, so even if the raw material 5 flows into the blast furnace 1 in the above-mentioned condition, it becomes coarse particles when it flows out. Separation of the raw material 5 from fine particles or fluctuation in particle size of the raw material 5 over time is eliminated, and the raw material 5 is charged into the blast furnace 1 in a uniformly mixed state.

[Effects of the invention] In summary, the present invention provides the following excellent effects.

(1) Since a distribution chute is installed inside the pressure equalization bunker so that it can tilt and rotate freely, there is no change in particle size of the raw materials charged into the blast furnace over time, and the raw materials are charged in a uniformly mixed state. It is possible to provide an apparatus with a high degree of freedom in adjusting raw material distribution, and it is possible to promote reactions in the blast furnace.

(2) Since the upper part of the pressure equalizing bunker is connected to the raw material supply system, the height of the furnace top charging device can be reduced, and the equipment of the raw material supply system such as belt conveyors can be reduced. Equipment costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of the furnace top charging device of the present invention, FIG. 2 is a schematic diagram showing a first conventional example,
FIG. 3 is a schematic diagram showing a second conventional example. In the figure, 1 is a blast furnace, 2 is a pressure equalizing bunker, 4 is a raw material supply system, 5 is a raw material, 6 is a raw material inlet, 10 is a distribution chute, and 15 is a furnace top charging device.

Claims (1)

[Scope of utility model registration request] A pressure equalizing bunker whose lower part is connected to the charging port of the blast furnace, whose upper part is connected to the raw material supply system, has a raw material inlet for introducing the raw material, and whose inside is sealed to equalize the internal pressure of the blast furnace; A furnace top charging device characterized by comprising a distribution chute which is provided in a pressure bunker so as to be tiltable and rotatable, and for uniformly distributing and storing raw materials introduced from the raw material inlet into the pressure equalizing bunker. .