JP2021161466A - Ore-receiving liner for blast furnace - Google Patents

Abstract

To enable simple removal means to be applied when a suspension ring is broken, and mounting of a new suspension ring to be easy.SOLUTION: A ore-receiving liner 10 for a blast furnace with a suspension ring 20 on its upper portion is mounted on an upper portion of an inside of a blast furnace A. Before it is mounted, a suspension hole 30 is formed in advance on a center in a width direction of an upper portion 12 of a liner main body 10a. When the suspension ring 20 of the ore-receiving liner 10 is broken and cannot withstand lifting strength, a chain, a rope or the like is passed through the suspension hole 30 for fixing, and the ore-receiving liner 10 is removed from the upper portion of the inside of the blast furnace A via the chain or the like. The suspension ring can be replaceable by changing the structure so that a mounting piece 25 is provided on the upper portion 12 of the liner main body 10a, and the suspension ring 20 is attached to the mounting piece 25, in which the suspension ring 20 can be attached to and detached from the mounting piece 25 with a removable bolt and nut 23 that penetrates the suspension ring and the mounting piece. Therefore, the ring 20 can be replaced by removing the bolt and nut.SELECTED DRAWING: Figure 1

Description

The present invention relates to an ore receiver provided in the upper part of the blast furnace and a method for removing the ore receiver.

In a blast furnace for iron making, charges such as sintered pellets, massive ore, various auxiliary raw materials, and coke input from the top of the furnace are temporarily stored in the charging equipment inside the top of the furnace, and the inside of the furnace is stored. It is charged into the furnace as appropriate according to the depth of the charge. There are two types of charging devices, for example, a bell type and a swivel type. In the bell type, ore or the like is charged into the furnace by opening and closing a plurality of bells (see Patent Document 1, FIGS. 7 and 8). .. In the swivel type, ore or the like is charged into the furnace while swirling the swivel chute (see Patent Document 2, FIG. 7 (C)).

At the time of this charging, all the charging devices radially disperse and charge the charged material into the furnace, so that the dispersed charged material collides with the refractory of the furnace wall and the iron skin and wears it. .. For this reason, 20 to 30 ore receivers made of heat-resistant and wear-resistant cast iron and heat-resistant and wear-resistant cast iron are provided on the inner peripheral surface of the upper part of the furnace in 20 to 30 pieces, and are dropped radially from the charging device. The charged material bounces off the ore receiver and is charged into the furnace (see FIG. 1 of the present application).
In this way, when the charge is charged, a large amount of charge collides with the inner peripheral surface of the ore receiver, so that the collision surface is severely damaged and the ore receiver can be taken in and out at an appropriate time. The manhole for suspension is replaced by using a crane or winch erected at the top of the furnace.

As shown in FIG. 6, a plurality of the conventional ore receivers 10'are vertically and horizontally on the surface (the iron skin 1 side below) of a rectangular metal body 10a' made of heat-resistant and abrasion-resistant cast iron or heat-resistant and abrasion-resistant cast iron. Ribs 11 were formed, the upper portion 12 was bent to the front side, an upper chain hole 14 was formed at the top thereof, suspension rings 13 were provided on both side top surfaces of the upper portion 12, and a lower chain hole 14 was provided on the lower surface. It is a thing.

Special Publication No. 57-47729 Japanese Unexamined Patent Publication No. 11-71606

As described above, the ore receiver 10'needs to be replaced at an appropriate time because a large amount of the charged material collides with the surface and the collision surface is severely damaged when the charged material is charged. be. At this time, usually, the chain is hooked on the hanging ring 13 and lifted.
At this time, as shown in FIG. 7, the conventional ore receiver 10'is attached by wrapping a stainless steel ring 13 at the time of casting the ore receiver 10'. Since the ore receiver 10'including the ring 13 is exposed to a high temperature in the blast furnace, it may crack and break.
In order to remove the ore receiving material 10'that the ring 13 is broken, it is necessary to make a hole in the ore receiving material 10'by means such as gouging in the blast furnace to allow a wire or a chain to pass through, which is costly. At the same time, the work is complicated (the difficulty level is high).

Further, when reusing the ore receiver 10', it is necessary to install a new suspension ring 13 on the ore receiver 10'in which the suspension ring 13 is broken, but the ore receiver 10'after use has a structure. Since it is not suitable for welding, the work is not large and the cost is high.

Under the above circumstances, the first object of the present invention is to enable a simple removal means when the suspension ring is broken, and the second object is to facilitate the attachment of a new suspension ring. Make it an issue.

In order to achieve the first object, the present invention is an ore receiver for a blast furnace which is attached to the inner upper part of the blast furnace and has a ring at the upper part, and before attaching a hanging hole to the upper part of the metal body. It was formed in advance.
In this way, if the hanging hole is formed in advance, even if the hanging ring is broken, the ore receiver can be hooked through the hole through a striatum such as a rope or a chain by the same means as usual. It can be lifted and replaced.

In order to achieve the second object, the present invention makes the ring replaceable. If replaceable, the ore receiver can be reused by replacing the ring.
As a replaceable configuration, a mounting piece is provided on the upper part of the hardware body, the hanging ring is attached to the mounting piece, and the mounting is provided with a removable pin that penetrates the hanging ring and the mounting piece. It is possible to adopt a configuration in which a ring can be attached to and detached from one side.
This detachable configuration of the ring can also be adopted in the ore receiver that does not form the suspension hole.

Each ore receiver having the above-mentioned suspension hole formed can be fixed to the suspension hole through a linear body such as a chain or a rope, and can be removed from the inner upper part of the blast furnace via the linear body.

In the present invention, since the suspension hole is formed in advance as described above, even if the ring is broken, the ore receiver can be smoothly lifted and replaced by the same means as usual.
In addition, since the ring can be replaced, the ore receiver can be easily reused.

A cut side view of an embodiment of an ore receiver according to the present invention. Front view of the same embodiment The hanging ring portion of the same embodiment is shown, (a) is a front view of the hanging ring, and (b) is a cut side view. Mounting operation diagram of the same embodiment Mounting operation diagram of the same embodiment Mounting operation diagram of the same embodiment Mounting operation diagram of the same embodiment Removal operation diagram of the same embodiment Removal operation diagram of the same embodiment Removal operation diagram of the same embodiment A conventional ore receiver is shown, (a) is a cut side view, and (b) is a front view. Front view of the same main part cut

As shown in FIG. 1, the ore receiver 10 according to the present invention is provided on the upper inner peripheral surface of the blast furnace A for iron making, as in the conventional case. The blast furnace A has a structure in which the outside is covered with an iron skin 1 made of thick steel plate and the inside is thickly lined with refractory bricks 2, and sintered pellets, massive ore, various auxiliary raw materials, coke, etc. The charges are temporarily stored in the charging equipment inside the furnace top, and are appropriately charged into the furnace according to the depth of the charges in the furnace by a bell-type or swivel-type charging device. In FIG. 1, 3 is an amorphous refractory layer.

As shown in FIGS. 1 and 2, the ore receiver 10 is vertically and horizontally formed on the surface (iron skin 1 side) of a rectangular metal body 10a made of heat-resistant and abrasion-resistant cast iron or heat-resistant and abrasion-resistant cast iron, as in the conventional case. A plurality of ribs 11 are formed in the above, the upper portion 12 is bent to the front side, and a chain hole 14 is formed at the top thereof. Further, the ore receiver 10 is provided with ring 20s on both side top surfaces of the upper portion 12 of the hardware body 10a, and a chain hole 14 is also provided on the lower surface. The chains 15 and 15 are hooked on the chain holes 14 and 14 and guided to the outside of the furnace (outside the iron skin 1) and fastened with the fastener 16 to provide the ore receiver 10 on the upper inner peripheral surface of the blast furnace A. In the figure, reference numeral 17 denotes a mounting claw, which is used when the water-cooled metal fitting 8 is provided as shown by the chain line in FIG.

The above configuration of the ore receiver 10 is the same as that of the conventional case, and the features of the embodiment according to the present invention are that the suspension hole 30 is formed in the center of the upper portion 12 of the hardware body 10a in the width direction and that the suspension is suspended. The point is that the ring 20 can be attached and detached.
The position and size of the hanging hole 30 are appropriately set by an experiment or the like so that the ore receiver 10 can be smoothly lifted by the wire 7 described later and the strength is not deteriorated. The number of the hanging holes 30 is sufficient, but if necessary, it may be 2 or more, and at that time, equal intervals are preferable.
The ring 20 is made of stainless steel and has an annular main body 21 lacking a lower portion, legs 22 and 22 extending downward from the missing end, and bolts and nuts 23 penetrating between the lower portions of both legs 22. It is composed of a fall prevention rod 24 fixed between the upper portions of both legs 22 (see FIG. 3).
As shown in FIGS. 2 and 3B, the ring 20 is formed by passing bolts and nuts (pins) 23 through the mounting holes 26 of the mounting pieces 25 protruding from the upper portion 12 of the hardware body 10a. Attach to 10a. At this time, the fall prevention rod 24 comes into contact with the upper surface of the upper portion 12 of the main body of the hardware to maintain the upright state of the ring 20.

The ore receiver 10 of this embodiment has the above configuration, and next, the attachment / detachment of the ore receiver 10 to the upper part of the blast furnace A will be described.

To attach the ore receiver 10 to the upper part of the blast furnace A, first, outside the blast furnace A, the chains 15 and 15 are hooked on the upper and lower chain holes 14 and 14 of the ore receiver 10 as shown in FIG. 4A. Next, as shown in FIG. 4B, a hook 4 such as a crane on the upper part of the blast furnace A is hooked on the suspension ring 20, and as shown in FIG. 4C, the ore receiver 10 is positioned at the mounting position in the upper part of the blast furnace. The upper and lower chains 15 and 15 are guided to the mounting holes (through holes) 5 of the iron skin 1 and fastened with the fasteners 16 to provide the ore receiver 10 on the upper inner peripheral surface of the blast furnace A.
After that, as shown in FIG. 4D, the hook 4 is removed from the ring 20 and moved out to complete the attachment of the ore receiver 10. The positions and numbers of the mounting holes 5 are appropriately set so that the ore receiving material 10 can be smoothly attached. For example, in this embodiment, the top: two places, the bottom: with respect to one ore receiving material 10. It is provided in one place, a total of three places.

When the ore receiver 10 is removed from the upper part of the blast furnace A, it is time to replace the ore receiver 10 due to wear or the like, and if the ring 20 is not broken and has sufficient lifting strength, it is shown in FIG. 4C. As described above, the ore receiver 10 is lifted by the hook 4 via the ring 20 and removed.
On the other hand, when it is recognized that the hanging ring 20 does not have sufficient lifting strength due to breakage or the like, as shown in FIG. 5A, a keyed rod 6 is inserted into the furnace from one of the mounting holes 5 of the iron skin 1 and hooked. The wire 7 suspended from 4 is grasped by the keyed rod 6. In that state, as shown in FIG. 5B, the wire 7 is placed in the hanging hole 30 and the tip thereof is passed through the hole 30, and as shown in FIG. 5C, the tip of the wire 7 is re-grasped and hooked on the hook 4. In this state, the ore receiver 10 is lifted and removed by the hook 4 in the same manner as described above (see FIG. 4C).

When the removed ore receiver 10 is replaced with a new one without being regenerated, the new ore receiver 10 is attached to the inner surface of the upper part of the blast furnace A by the above attachment procedure.
Further, when the removed ore receiver 10 is reused by hardening and overlaying the worn portion, if there is no problem such as breakage of the ring 20, the ore is used as it is with the old ring 20 as described above. The receiver 10 is suspended and attached to the inner surface of the upper part of the blast furnace A.
On the other hand, if the ring 20 has a problem such as breakage, pull out the bolt / nut 23 of the ring 20, replace the ring body 21 with a new one, and attach the ring 20 to the ore receiver 10 with the bolt / nut 23. .. After that, in the same manner as described above, the ore receiver 10 is suspended by the new ring 20 and attached to the inner surface of the upper part of the blast furnace A.

The procedure for attaching / detaching the ore receiver 10 is an example, and it goes without saying that other means can be adopted.
Needless to say, the replacement structure of the ring 20 is not limited to the above embodiment. Further, also in this embodiment, the protective plate described in Patent Document 2 and the like can be attached.
Thus, the embodiments disclosed this time should be considered to be exemplary in all respects and not restrictive. The scope of the present invention is indicated by the claims and is intended to include all modifications within the meaning and scope equivalent to the claims.

A Blast furnace 1 Iron skin 2 Refractory bricks 3 Atypical refractory 4 Hook 5 Chain mounting hole 6 Keyed rod 7 Wire 10, 10'Ore receiver 10a, 10a'Ore receiver body 11 Ore receiver rib 12 Ore receiver Upper part 13 Conventional suspension ring 14 Chain hole 15 Chain 16 Fastener 20 Hanging ring 21 Hanging ring body 22 Hanging ring leg 23 Bolts and nuts 24 Fall prevention stile 25 Hanging ring mounting piece 30 Hanging hole

Claims (3)

A blast furnace ore receiver (10) attached to the inner upper part of the blast furnace (A) and having a ring (20) at the upper part, and a hanging hole (30) in the upper part (12) of the metal body (10a). Blast furnace ore receiver formed in advance before installation. A mounting piece (25) is provided on the upper portion (12) of the hardware body (10a), the hanging ring (20) is attached to the mounting piece (25), and the hanging ring (20) and the mounting piece (25) are combined. The ore receiver for a blast furnace according to claim 1, wherein a ring (20) can be attached to and detached from the mounting piece (25) with a removable pin (23) penetrating the attachment piece (25). The blast furnace ore receiver (10) according to claim 1 or 2 is fixed to the suspension hole (30) through a striatum (7) such as a chain or rope, and is fixed via the linear body (7). A method for removing the ore receiver for a blast furnace, in which the ore receiver (10) is removed from the inner upper part of the blast furnace (A).

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