JP2012132063A - Method for dismantling tuyere sleeve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To conduct dismantlement of a tuyere sleeve more easily.SOLUTION: The sleeve 3 is hacked at least two places in the circumferential direction of the sleeve 3 along the direction of axis in a belt-like shape from one end to the other end, and each divided sleeve 3 is removed from a tuyere 1. Specifically, a vibrator 4 is used which continuously hit an object by vibrating a chisel in the direction of axis with air pressure, and the sleeve 3 is hacked along the direction of axis in the belt-like shape from one end to the other end by bringing the tip of the chisel 5 into contact with the marginal part 9 of the sleeve 3 in the direction of axis and vibrating the chisel 5.

Description

  The present invention relates to a tuyere sleeve disassembly method.

  Depending on the operating conditions of the blast furnace, wind speed adjustment at the tuyere may be required.In this case, replace the tuyere itself or replace the sleeve fixed to the inner peripheral surface of the tuyere, It is conceivable to adjust the cross-sectional area of the tuyere (see Patent Document 1).

JP 2007-1000016 A

By the way, it is easier and cheaper to replace the sleeve than to replace the tuyere itself. However, since the sleeve is fixed (adhered) to the inner peripheral surface of the tuyere via mortar, the existing sleeve must first be disassembled in order to replace the sleeve. In the past, dismantling work was carried out by using a bar and a hammer to beat the entire surface, but it took a lot of labor and time.
It is an object of the present invention to more easily perform tuyere sleeve disassembly.

  In order to solve the above problems, a tuyere sleeve disassembling method according to the present invention is a tuyere sleeve disassembling method for disassembling a sleeve fixed to the inner peripheral surface of a tuyere in a blast furnace via a mortar, The sleeve is turned from one end to the other end along the axial direction in at least two places in the circumferential direction of the sleeve, and each of the divided sleeves is peeled off from the tuyere. .

Further, using a vibrator that continuously strikes an object by vibrating the chisel in the axial direction by air pressure, the tip of the chisel is brought into contact with the axial edge of the sleeve, and the chisel is By oscillating, the sleeve is rolled from one end to the other end in a belt shape along the axial direction.
Further, the width of the chisel is set in a range that is larger than the thickness of the sleeve and smaller than twice the thickness of the sleeve, and the width direction of the chisel is matched with the radial direction of the sleeve, The tip of the chisel is brought into contact with the edge of the sleeve in the axial direction to vibrate the chisel.

  Further, the chisel is formed by a long side forming one side in the width direction, a short side forming the other side in the width direction, and an oblique side connecting the long side and the tips of the short sides, and the long side The chisel is vibrated while the tip of the oblique side is brought into contact with the mortar and the long side is along the inner peripheral surface of the tuyere.

  In the tuyere sleeve disassembling method according to the present invention, first, at least two portions in the circumferential direction of the sleeve are rolled from one end to the other end along the axial direction (hanging). In this way, by dividing the sleeve fixed to the inner peripheral surface of the tuyere into two or more, each piece of the sleeve can be easily peeled off from the tuyere, and each can be easily peeled off from the tuyere. . Therefore, the sleeve can be disassembled more easily than when the disassembly operation is advanced by rolling the entire surface.

Also, using a vibrator that continuously strikes the object by vibrating the chisel in the axial direction with air pressure, the tip of the chisel is brought into contact with the edge of the sleeve in the axial direction to vibrate the chisel. Thus, the sleeve can be more easily rolled from one end to the other end in a strip shape along the axial direction.
The chisel width is set to a range larger than the thickness of the sleeve and smaller than twice the thickness of the sleeve, so that the width of the chisel is aligned with the radial direction of the sleeve. When the chisel is vibrated by contacting the edge of the sleeve in the axial direction, the hitting energy of the chisel can be effectively transmitted to the mortar and the sleeve. That is, the sleeve can be rolled more effectively by setting the center point of the hitting energy of the chisel within the thickness range of the sleeve.

  Further, the chisel is formed by a long side that forms one side in the width direction, a short side that forms the other side in the width direction, and a hypotenuse that connects the long sides and the tips of the short sides, so that the long side and the hypotenuse When the chisel is vibrated while the tip end of the chisel is brought into contact with the mortar and the long side is along the inner peripheral surface of the tuyere, chisel impact energy can be mainly transmitted to the mortar. That is, by rolling from the mortar, the sleeve can be wound more effectively as a result.

1 is a schematic configuration diagram of a tuyere 1. FIG. It is a figure which shows the disassembly method of the sleeve. FIG. 3 is a schematic configuration diagram of a vibrator 4. It is a figure which shows the usage method of the vibrator.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of the tuyere 1.
A heat insulating sleeve 3 is fixed (adhered) to the inner peripheral surface of the tuyere 1 in the blast furnace through a mortar 2. Since the inside of the tuyere 1 is water-cooled, the sleeve 3 serving as a refractory is fixed to the inner peripheral surface serving as the hot air flow path, thereby preventing the hot air temperature from decreasing.
In blast furnace operation, in order to improve the pulverized coal combustibility while maintaining the core temperature, it is necessary to enlarge the raceway. For this reason, an increase in the wind speed at the tuyere 1 may be required. As can be seen, this can be realized by reducing the inner diameter of the sleeve 3. Therefore, first, the existing sleeve 3 is disassembled, and then a new sleeve 3 having a small inner diameter is installed.

FIG. 2 is a view showing a method for disassembling the sleeve 3.
Of the circumferential direction of the sleeve 3, the sleeve 3 is wound in a band shape from one end to the other end along the axial direction, and each of the two divided sleeves is peeled off from the tuyere 1. To do.
Thus, by dividing the sleeve 3 fixed to the inner peripheral surface of the tuyere 1 in two, each piece of the sleeve 3 is easily peeled off from the tuyere 1, and each is easily peeled off from the tuyere 1. Can be made. Therefore, the sleeve 3 can be disassembled more easily as compared with the prior art in which the disassembly operation is performed by rolling the entire surface.

A vibrator 4 is used to disassemble the sleeve 3.
FIG. 3 is a schematic configuration diagram of the vibrator 4.
The vibrator 4 is a tool that beats or peels off the object by continuously hitting the object by vibrating the chisel 5 in the axial direction by air pressure. For example, Super Keren (trade name) of Nitto Kohki Co., Ltd.

The chisel 5 is a chisel formed in a substantially flat plate shape, and the width thereof is larger than the thickness of the sleeve 3 and smaller than twice the thickness of the sleeve 3. The chisel 5 includes a long side 6 that forms one side in the width direction, a short side 7 that forms the other side in the width direction, and a hypotenuse 8 that connects the ends of the long side 6 and the short side 7. The tip of the chisel 5 is subjected to induction hardening. The angle formed by the long side 6 and the hypotenuse 8 is, for example, about 30 to 45 degrees.
The dimensions of the chisel 5 are, for example, the following values.
Total length: 400mm
Width: 15mm
Thickness: 5mm

FIG. 4 is a diagram illustrating a method of using the vibrator 4.
The tip of the chisel 5 is brought into contact with the edge 9 of the sleeve 3 in the axial direction, and the chisel 5 is vibrated, whereby the sleeve 3 is wound in a belt-like shape from one end to the other end along the axial direction. ).
Thereby, compared with the case where a bar and a hammer are used, the sleeve can be rolled from the one end to the other end in a strip shape along the axial direction more easily.

Specifically, with the width direction of the chisel 5 aligned with the radial direction of the sleeve 3, the tip of the chisel 5 is brought into contact with the edge portion 9 in the axial direction of the sleeve 3 to vibrate the chisel 5.
Since the width of the chisel 5 is set in a range larger than the thickness of the sleeve 3 and smaller than twice the thickness of the sleeve 3, the impact energy of the chisel 5 is effectively transmitted to the mortar 2 and the sleeve 3. be able to. That is, by placing the center point of the hitting energy of the chisel 5 within the thickness range of the sleeve 3, the sleeve 3 can be wound more effectively.

Further, the ends of the long side 6 and the oblique side 8 are brought into contact with the mortar 2, and the chisel 5 is vibrated while the long side 6 is along the inner peripheral surface of the tuyere 1.
Thereby, the impact energy of the chisel 5 can be mainly transmitted to the mortar 2. That is, by rolling from the mortar 2, the sleeve 3 can be wound more effectively as a result.

When the above method was carried out, it was demonstrated that one sleeve can be disassembled in about 5 minutes and can be disassembled smoothly.
In this embodiment, the sleeve 3 is divided into two parts and then the pieces are peeled off from the inner peripheral surface of the sleeve 3. However, if the divided pieces are difficult to peel off, the pieces are divided into two or more pieces. Each piece may be peeled off from.

1 tuyere 2 mortar 3 sleeve 4 vibrator 5 chisel 6 long side 7 short side 8 hypotenuse 9 edge

Claims (4)

  A tuyere sleeve disassembling method for disassembling a sleeve fixed to an inner peripheral surface of a tuyere in a blast furnace via a mortar, wherein the sleeve is arranged along the axial direction at least in two places in the circumferential direction of the sleeve. A tuyere sleeve disassembling method characterized in that it is rolled from one end to the other end, and each of the divided sleeves is peeled off from the tuyere. Using a vibrator that continuously strikes the object by vibrating the chisel in the axial direction with air pressure,
The sleeve is wound from one end to the other end in a strip shape along the axial direction by bringing the tip of the chisel into contact with an axial edge of the sleeve and vibrating the chisel. The tuyere sleeve disassembly method according to claim 1. The width of the chisel is set in a range larger than the thickness of the sleeve and smaller than twice the thickness of the sleeve,
3. The chisel is vibrated by bringing the tip end of the chisel into contact with an axial edge of the sleeve in a state where the width direction of the chisel is matched with the radial direction of the sleeve. The tuyere sleeve disassembly method as described. The chisel is formed by a long side that forms one side in the width direction, a short side that forms the other side in the width direction, and a hypotenuse that connects the long sides and the tips of the short sides,
The tip of the long side and the oblique side is brought into contact with the mortar, and the chisel is vibrated while the long side is along the inner peripheral surface of the tuyere. How to dismantle the tuyere sleeve.

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