JP2000178619A - Blast furnace constructing equipment and blast furnace construction method using the equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blast furnace constructing equipment capable of shotening the term of works and reducing cost. SOLUTION: At least a part of the framework is constituted of hollow pipes meltable in the blast furnace (e.g. annular pipes 20a, b, c and radial pipes 30a, b). The objective blast furnace constructing equipment for executing the repairing work in the blast furnace (e.g. deck 10 for laying the bricks in the blast furnace) is constituted by providing the plural gas venting holes 40 downward in the hollow pipes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blast furnace construction facility for newly constructing in a blast furnace or for reconstructing an internal structure such as a brick using a steel shell of the blast furnace and this blast furnace construction. Blast furnace construction work method using equipment for
In particular, the present invention relates to a blast furnace construction facility and a gas vent facility.

[0002]

2. Description of the Related Art Conventionally, when a refractory brick, a cooling device or the like constructed in a blast furnace deteriorates, the operation of the blast furnace has been stopped and repaired. In this repair work, the work was carried out substantially in the same manner as in the construction of the blast furnace, in a steel shell, with blast furnace construction equipment provided. This blast furnace construction equipment is composed of, for example, two or three steps of bricks for in-furnace brick stacking up and down, and assembling the decks for brick-furnace in-furnace in a blast furnace, and working with a hoist crane provided at the lower part of the deck The equipment was used to repair firebricks and the like. When the work was completed, the blast furnace construction equipment was dismantled and taken out of the blast furnace to start blast furnace operation.

Further, when the blast furnace operation is started, it is necessary to discharge gas blown from the tuyere or generated at the tuyere front from the taphole. In other words, if no countermeasures are taken against the gas generated immediately after the start of blast furnace operation, this gas will rise inside the blast furnace and be discharged from the furnace top, and the refractory bricks installed on the furnace bottom will heat up sufficiently. However, this may cause troubles such as defective discharge of the melt. Therefore, after the construction or repair work of the blast furnace operation is completed, a gas venting facility is installed at the bottom of the furnace, and gas generated immediately after the start of the blast furnace operation is discharged from the taphole.

[0004]

However, in the above-mentioned working method using the conventional blast furnace construction equipment, the blast furnace construction equipment must be disassembled and carried out after the work is completed. There was a problem that costs increased. In addition, after the work is completed, it is necessary to separately install degassing equipment, and there is a problem that the construction period is further increased and the cost is increased. The blast furnace construction equipment and the blast furnace construction method according to the present invention have been proposed in view of the above-mentioned circumstances, and have an object to shorten the construction period and cost of blast furnace construction or blast furnace repair work. .

[0005]

The blast furnace construction equipment and the blast furnace construction method according to the present invention have the following features in order to achieve the above object. The blast furnace repair equipment according to the present invention is characterized in that at least a part of the framework is constituted by a hollow pipe that can be melted in a blast furnace, and the hollow pipe is provided with a plurality of gas vent holes facing downward. Things.

A blast furnace construction work method according to the present invention comprises:
At least a part of the skeleton of the blast furnace construction equipment is constituted by a hollow pipe that is provided with a plurality of gas vent holes downward and that can be melted in the blast furnace, and after the work by the blast furnace construction equipment is completed, the blast furnace construction equipment is The blast furnace operation is started by lowering the furnace bottom, and the gas generated immediately after the operation is started is discharged outside the blast furnace through the hollow pipe.

[0007] With this configuration, after the blast furnace construction or repair work is completed, the blast furnace construction equipment used for the work can be used as the gas venting equipment. For this reason, it is not necessary to disassemble all the blast furnace construction equipment, and it is not necessary to separately construct a degassing facility, so that the construction period can be shortened and the cost can be reduced.

[0008] Further, the frame may have a removable outer peripheral portion. When the outer peripheral portion of the skeleton can be removed, after the repair work is completed, the blast furnace construction equipment is dismantled, and only the skeleton portion formed of a hollow pipe that can be installed at the furnace bottom may be lowered to the furnace bottom. With such a configuration, even when the diameter of the furnace bottom is smaller than the center of the furnace, the blast furnace construction equipment can be used as a degassing equipment.

It is preferable that a gas vent pipe connected to a taphole provided on a side wall of the blast furnace is connected to the hollow pipe. When a gas vent pipe is connected to the hollow pipe, gas generated immediately after the start of operation is discharged to the outside of the blast furnace via the gas vent pipe. With such a configuration, degassing can be reliably performed immediately after the start of blast furnace operation, so that the temperature of the refractory brick installed on the bottom of the furnace is sufficiently raised, and trouble such as defective discharge of molten material occurs. There is no danger of doing so.

[0010] Further, the blast furnace construction equipment can be configured as a deck for mounting a stave or for stacking bricks in a furnace. By adopting such a configuration, the blast furnace construction equipment according to the present invention can be configured by only slightly improving the conventional blast furnace construction equipment, and the cost can be further reduced. .

Although the present invention stipulates the equipment for blast furnace construction, the repair of blast furnace is substantially the same as the construction of the blast furnace, and the operation of restarting the operation is the same as that of the blast furnace construction. Needless to say, the above-mentioned blast furnace construction equipment may be used for repairing the blast furnace.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a blast furnace construction facility and a blast furnace construction method according to the present invention will be described with reference to the drawings. 1 to 6 show an embodiment of a blast furnace construction facility according to the present invention. FIG. 1 is a plan view of the blast furnace construction facility, and FIG. 2 is a part of a blast furnace equipped with the blast furnace construction facility. Longitudinal section, FIG. 3 is a plan view of a blast furnace construction facility used as a degassing facility, FIG. 4 is a partial longitudinal sectional view of a blast furnace equipped with a blast furnace construction facility used as a degassing facility,
FIG. 5 is a view taken in the direction of arrows BB in FIG. 3, and FIG. 6 is an enlarged side view of the upper end of the gas vent pipe.

The blast furnace construction equipment according to the present invention is shown in FIGS.
As shown in FIG. 1, the deck comprises, for example, an in-furnace brick-laying deck 10. The brick stacking deck 10 includes regular octagonal annular pipes 20a provided in three stages from the center to the outer periphery.
b, c and radial pipes 30a, b connecting the respective vertices of the annular pipes 20a, b, c. Each annular pipe 20
a, b, c and the radial pipes 30a, 30b are each formed of a hollow pipe and are connected to each other. The annular pipes 20a, b, c and the radial pipe
The shape and number of 30a and 30b can be changed as appropriate according to the shape and inner diameter of the blast furnace.

Of the annular pipes 20a, b, c and the radial pipes 30a, b, the outermost peripheral pipe 20c and the radial pipe 30b connecting the outermost peripheral part and the central annular pipe 20c, b are removable. It has become. That is, as shown in FIG. 2, when the inner diameter of the furnace bottom is smaller than the center of the furnace, the outer diameter of the annular pipe 20b at the center is formed smaller than the inner diameter of the furnace bottom, By removing the annular pipe 20c and the radial pipe 30b connecting the outermost peripheral part and the central annular pipes 20c, b, the brick stacking deck 10 can be lowered to the furnace bottom.

Each of the annular pipes 20a, b, c and each of the radial pipes 30a, b are provided with a plurality of gas vent holes 40 (only some of them are shown in FIGS. 1 and 3) facing downward. I have. In addition, the direction of the gas vent hole 40 may be any angle between directly beside and immediately below, instead of just below. That is, when using the in-furnace brick-laying deck 10 as a degassing facility, if the angle does not allow the charge into the blast furnace to enter the degassing hole 40, what kind of degassing hole 40 It may be provided at an angle. Also, the outermost peripheral annular pipe 20c and the radial pipe 30b connecting the outermost peripheral part and the central annular pipes 20c, b, which are removed when used as a gas venting facility, need not be provided with the gas vent hole 40. Good. Further, the number of the gas vent holes 40 and the position where the gas vent holes 40 are provided can be changed as appropriate.

As shown in FIG. 2, a top plate 50 is attached to the upper part of the in-furnace brick stacking deck 10,
The space formed by the annular pipes 20a, b, c and the radial pipes 30a, b is closed. A rail 60 is attached to a lower portion of the in-furnace brick-laying deck 10, and a hoist crane 70 is movably attached to the rail 60. In the above-mentioned in-furnace brick stacking deck 10, refractory bricks and the like are placed on the top plate 50, and the refractory bricks are unloaded by the hoist crane 70 for work.
In addition, the top plate 50 also serves to protect workers against falling objects from above the in-furnace brick-laying deck 10. Although the above-described blast furnace construction equipment has been described as an example of the in-furnace brick-laying deck 10, it may be configured as a stave mounting deck.

When the work in the blast furnace is completed, the top plate 50, the rail 60,
While removing the hoist crane 70, the outermost peripheral annular pipe 20c and the outermost peripheral and central annular pipes 20c are removed.
The radial pipe 30b connecting c and b is removed. Deck 10 for brickwork in the furnace, which was thus only framed
Is lowered to the bottom of the furnace and installed as a degassing facility.

As shown in FIGS. 3 and 4, a furnace wall 80 of the blast furnace is attached to an annular pipe b at the center of the in-furnace brick deck 10.
Gas vent pipes 100 are respectively provided upright at positions facing the tapholes 90 provided in the tank. This degassing pipe
Numeral 100 denotes a hollow pipe having an open lower end and a closed upper end. As shown in FIG. 5, a connection for connecting a gas vent pipe 110 communicating with a tap hole 90 is provided on the upper side surface. A mouth 120 is provided.

As shown in FIGS. 3 to 6, the gas vent pipe 100 is connected at its lower end to the upper surface of an annular pipe 20b at the center and communicates with a tap hole 90 at a connection port 120. The gas vent pipe 110 is connected. In addition, between the central annular pipe 20b and the degassing pipe 100,
As shown in FIG. 5, a pair of left and right support members 130 is provided.
Is supported on the central annular pipe 20b. The position where the gas vent pipes 100 are provided and the number of gas vent pipes 100 can be appropriately changed according to the number of tap holes 90 and the like. The gas release pipe 100 may be attached to an annular pipe (for example, the central annular pipe 20b) after the in-furnace brick-laying deck 10 has been lowered to the furnace bottom. Alternatively, they may be provided in advance integrally with the annular pipe.

After the in-furnace brick-laying deck 10 is installed at the bottom of the furnace as a degassing facility, the operation of the blast furnace is started. Gas blown from the tuyere or generated at the front of the tuyere passes through the vent holes 40 into the annular pipes 20a and 20b.
And into the radial pipe 30a,
Then, the gas is discharged from the tap hole 90 to the outside of the blast furnace via the gas vent pipe 110. In addition, the in-furnace brick-laying deck 10, which has become a gas venting facility, is melted by heat in the blast furnace, mixed with pig iron and the like, and discharged from the tap hole 90.

The removed top plate 50, rail 60, hoist crane 70, annular pipe 20c, radial pipe 30b, etc. may be carried out of the blast furnace, but members not to be reused are lowered to the furnace bottom. However, it may be melted after the start of the blast furnace operation. In the embodiment described above,
Although the in-furnace decking 10 has been described as an example of the blast furnace construction equipment, the blast furnace construction equipment is not limited to this, and may be, for example, a gondola or the like.

[0022]

The blast furnace repair equipment and the blast furnace construction work method according to the present invention have the above-described structure, and therefore have the following effects. That is, in the blast furnace repair equipment according to the present invention, at least a part of the skeleton of the blast furnace construction equipment is configured by a hollow pipe that can be melted in the blast furnace, and the hollow pipe is provided with a plurality of gas vent holes facing downward. After the operation of the blast furnace is completed, the blast furnace construction equipment used for the operation is used as a degassing equipment.

Therefore, it is not necessary to disassemble all of the blast furnace construction equipment and carry it out of the blast furnace, and it is not necessary to separately provide a degassing facility. For this reason, the dismantling work of the blast furnace construction equipment and the construction work of the degassing equipment are extremely simplified, the construction period is shortened, and the cost can be reduced. Furthermore, since the materials used in the blast furnace construction equipment can be used as they are in the degassing equipment, the materials can be used effectively,
In this aspect as well, costs can be reduced and the environment can be protected by recycling.

Further, in the blast furnace repair equipment according to the present invention, the outer peripheral portion of the skeleton is removable, and after the repair work is completed, the blast furnace construction equipment is disassembled and only the skeleton part formed of a hollow pipe that can be installed at the furnace bottom is provided. To the furnace bottom. Therefore, even when the diameter of the furnace bottom portion is smaller than that of the central portion of the furnace, the blast furnace construction equipment can be used as a degassing equipment.

In the blast furnace repair equipment according to the present invention, the hollow pipe is connected to a gas vent pipe communicating with a taphole provided on the blast furnace side wall, and generated immediately after the start of operation through the gas vent pipe. Gas is discharged outside the blast furnace. Therefore, degassing can be reliably performed immediately after the start of the blast furnace operation, so that the temperature of the refractory brick applied to the furnace bottom is sufficiently raised, and there is no possibility that trouble such as defective discharge of the molten material occurs.

In the blast furnace repair equipment according to the present invention, the blast furnace construction equipment is constituted by the in-furnace brick deck. Therefore, the blast-furnace construction equipment according to the present invention can be configured by only slightly improving the conventional blast-furnace construction equipment, and the cost can be further reduced.

[Brief description of the drawings]

FIG. 1 is a plan view of a blast furnace construction facility according to the present invention.

FIG. 2 is a partial longitudinal sectional view of a blast furnace provided with the blast furnace construction equipment shown in FIG.

FIG. 3 is a plan view of a blast furnace construction facility used as a degassing facility.

FIG. 4 is a partial vertical sectional view of a blast furnace provided with blast furnace construction equipment used as the degassing equipment shown in FIG.

FIG. 5 is a view taken in the direction of arrows BB in FIG. 3;

FIG. 6 is an enlarged side view of an upper end portion of a gas vent pipe.

[Explanation of symbols]

 10 Furnace brick deck 20a-c Annular pipe 30a, b Radial pipe 40 Gas vent hole 50 Top plate 60 Rail 70 Hoist crane 80 Furnace wall 90 Taphole 100 Gas vent pipe 110 Gas vent pipe 120 Connection port 130 Supporting member

Claims (8)

[Claims] 1. A blast furnace construction facility for performing construction work in a blast furnace, wherein at least a part of the skeleton is formed by a hollow pipe that can be melted in the blast furnace, and a plurality of gasses are provided in the hollow pipe. Blast furnace construction equipment, characterized in that the holes are provided downward. 2. The blast furnace construction equipment according to claim 1, wherein an outer peripheral portion of the frame is removable. 3. The blast furnace construction equipment according to claim 1, wherein a gas vent pipe communicating with a taphole provided on a blast furnace side wall is connected to the hollow pipe. 4. The blast furnace construction equipment according to claim 1, wherein the blast furnace construction equipment is an in-furnace brick-laying deck. 5. At least a part of the skeleton of the blast furnace construction equipment is formed by a hollow pipe that is provided with a plurality of gas vent holes facing downward and that can be melted in the blast furnace. A blast furnace construction method, wherein the blast furnace construction equipment is lowered to a furnace bottom to start blast furnace operation, and gas generated immediately after the operation is started is discharged outside the blast furnace through the hollow pipe. 6. The blast furnace according to claim 5, wherein after the blast furnace construction work is completed, the blast furnace construction equipment is dismantled, and only a framework portion formed of a hollow pipe that can be installed at the furnace bottom is lowered to the furnace bottom. Construction method. 7. A gas vent pipe connected to a taphole provided on a blast furnace side wall is connected to the hollow pipe, and gas generated immediately after the start of operation is discharged to the outside of the blast furnace via the gas vent pipe. The blast furnace construction method according to claim 5 or 6, wherein: 8. The blast furnace construction method according to claim 5, wherein the blast furnace construction equipment is a deck for brickwork in a furnace.