JP2001152219A - Sealing device for tuyere part at stopping of blasting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing device for tuyere part at stopping of blasting, which can easily fit and can uniformly seal in the passage of the tuyere and surely checks in a furnace under sealing state. SOLUTION: This sealing device 10 for tuyere part at stopping of the blasting, is the one closing the passage of the tuyere 11 at stopping of the blasting in a blast furnace to prevent the suction of the air into the blast furnace. Then this device is provided with plural link mechanisms 13 which arrange at the tip part of a double tube 12 having an inner tube 16 and an outer tube 17 and change a substantial distance from the axis of the double tube 12 at the fitting part 27 arranged to the outside in the radial direction by relatively shifting the inner tube 16 to the outer tube 17, circular arc-state members 28 and 28a arranged to the fitting part 27 in each link mechanism 13, refractoriness cloth 14 disposed by covering an annular body formed with the circular arc-state members 28 and 28a fitted to each link mechanism 13 and having a fixed thickness and fastening means 32 and 15 arranged at the front side and/or the rear side of the link mechanism 13 and fixing the end part of the cylindrical refractoriness cloth 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tuyere sealing device for closing a tuyere when the blast furnace is shut off in order to prevent air from being sucked into the blast furnace from the tuyere.

[0002]

2. Description of the Related Art During maintenance of a blast furnace, the blowing from the tuyere to the inside of the blast furnace is stopped so that the air is stopped. At this time,
When air flows into the blast furnace through the tuyere, reactions in the furnace such as combustion of coke and formation of iron slag occur. Therefore, it is necessary to close the tuyere passage to suppress the reaction. Conventionally, as a method of closing the tuyere passage, a method of manually packing a plastic refractory into the tuyere passage from a peephole cover portion of a blow pipe using a bar-shaped jig has been implemented. The following tuyere passage closing method or device has been devised in order to achieve this. (1) Japanese Patent Application Laid-Open No. 62-243703 discloses FIG.
As shown in (A), a ring-shaped packing 71 is inserted into the tuyere passage 70, and a force is applied to the packing 71 from just before the passage 70 to deform the packing 71 in the diametrical direction. A tuyere sealing method and a device therefor when the blast furnace is shut off, characterized by being pressed against the surface 72, are described. (2) Japanese Patent Application Laid-Open No. Hei 7-242919 discloses FIG.
As shown in FIG. 3, a hollow body 74 made of heat-resistant rubber made of expandable and contractible rubber is arranged in a blow pipe 73 of a blast furnace tuyere.
A method for preventing air from being sucked into the blast furnace at the time of a calm, which is characterized in that the air blower 3 is closed.

(3) Japanese Patent Application Laid-Open No. 8-176630 discloses a cover 76 having a transparent ceramic plate 75 at the front end and a viewing hole at the rear end, as shown in FIG.
A long inner tubular body 77 closed by
An outer tubular body 78 that includes a stopper 79 that is open at the rear end in the cover 76 direction and fixes the position of the outer tubular body 78 with respect to the inner tubular body 77, and has one end provided with an aggregate 82 at one end. An outer tubular body 78 rotatably connected to the other end of the rotatably connected upholstery material 80;
1, the tip of which is fixed to the tip of the inner tubular body 77, and the inside of which is locked by a plurality of aggregates 82 capable of spreading the fireproof cloth 81 in an umbrella shape. A tool for closing a tuyere portion of a blast furnace, characterized by comprising:

[0004]

However, the conventional tuyere passage closing method and device have the following problems. (1) In the tuyere sealing method and apparatus during the blast-furnace outage, the amount of deformation of the ring-shaped packing 71 in the radial direction is only a very small dimensional change. The dimensions were almost the same as the inner diameter of 70, and it was difficult to withdraw when installing and removing, and the labor was large. Further, since the packing 71 slides in the tuyere passage 70, even if a durable means is used for the packing 71, damage to the packing 71 cannot be avoided. (2) In the method of preventing air from being sucked into the blast furnace at the time of the calm, the tuyere sealing work at the time of the calm is carried out immediately after the calm, so that the temperature inside the blow pipe 73 can use the hollow body 74. It was necessary to wait until the temperature dropped to 180 degrees, which was economically wasteful. In addition, when the inside of the furnace is submerged, a water-reacting reaction occurs in the furnace, and a flame may be ejected into the blow pipe 73 due to generation of carbon monoxide and hydrogen. There was a big problem.

(3) In a tool for closing a tuyere of a blast furnace,
Since the umbrella-shaped fireproof cloth 81 is spread, the outer periphery of the fireproof cloth 81 is
Just by being partially pressed by the respective aggregates 82 into the tuyere passage, the fireproof cloth 81 between the respective aggregates 82 becomes slack, and a uniform seal is provided between the tuyere passage and the fireproof cloth 81. Could not. Further, although a transparent ceramic plate 75 is attached to the tip, it is not practical because breakage, fogging, adhesion of dirt, and the like occur during use. The present invention has been made in view of the above circumstances, and can be easily installed, can uniformly seal the inside of the tuyere passage, and can surely inspect the inside of the furnace in a sealed state during a cold season. An object of the present invention is to provide a tuyere sealing device.

[0006]

According to the present invention, there is provided a tuyere sealing device according to the present invention, which is inserted into a tuyere passage to close the tuyere passage when the blast furnace is shut off. A tuyere sealing device at the time of calm to prevent air from being sucked into the inside of the tuyere, provided at the tip of a double tube having an inner tube and an outer tube, wherein the inner tube is positioned relative to the outer tube. A plurality of link mechanisms that change a substantial distance from the axis of the double pipe to a mounting portion provided on the radially outer side by moving the plurality of link mechanisms, and an arc shape provided on the mounting portion of each of the link mechanisms. A member, a refractory cloth having a certain thickness, which is disposed in a cylindrical shape so as to cover an annular body formed by the arc-shaped members attached to the link mechanisms, and a front side of the link mechanism and / or
Or, a fastening means provided on the rear side for fixing an end of the tubular refractory cloth. The refractory cloth is made of, for example, refractory fibers such as glass wool, rock wool, silica fiber, and alumina fiber.

When the inner pipe is moved relative to the outer pipe, the plurality of arc-shaped members move radially outward to form an annular body, and the annular body forms a fire-resistant cloth covering the outer side of the tuyere. The tuyere can be brought into contact with the passage with a uniform pressing force, and the tuyere can be reliably closed over the entire circumference without sagging of the fireproof cloth. Here, the adjacent arc-shaped members may be provided with a wrap portion that engages with the arc-shaped members. The wrap portion refers to a portion where adjacent arc-shaped members overlap when the annular body is viewed from the front. With this configuration, it is possible to prevent a gap from being generated in the seal portion when the arc-shaped member is expanded in diameter. Further, an advancing / retracting holding mechanism using a cotter for performing advancing / retracting and fixing of the outer pipe in the axial direction with respect to the inner pipe may be provided at a rear portion of the double pipe. With this configuration, it is possible to easily operate and fix the diameter expansion and reduction of the arc-shaped member. The rear portion of the inner tube may be provided with an openable opening window and an air outlet for blowing gas from the tip of the inner tube to remove foreign substances adhering to the front portion of the inner tube. . Immediately before the furnace inspection work, a high pressure nitrogen gas pipe etc. around the furnace was temporarily joined and gas was blown from the tip of the inner tube for a short time to remove foreign matter by wind pressure. Visual inspection of the situation can be reliably performed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. As shown in FIG. 1 and FIG. 2, the tuyere sealing device 10 at the time of calm according to an embodiment of the present invention includes:
When the blast furnace is closed, the tuyere passage 11
This is a device for closing the blast furnace and preventing air from being sucked into the blast furnace. This will be described in detail below. The tuyere sealing device 10 at the time of cold break includes four link mechanisms 13 equally arranged in the circumferential direction at the tip of the double pipe 12 and four link mechanisms 13.
, And fastening means 15 and 32 provided before and after the link mechanism 13. The double pipe 12
It has an outer tube 17 and an inner tube 16 which is inserted through the outer tube 17 so as to be able to move back and forth, and has a longer overall length than the outer tube 17.
It has. Further, a grip member 42 used when the tuyere sealing device 10 is inserted into the tuyere passage 11 at the time of the calm is attached to a lower portion of the outer tube 17 slightly on the front side of the advance / retreat holding mechanism 18. In front of the tuyere passage 11, a support portion 19 is attached to the outer tube 17 so that the tuyere sealing device 10 can be supported on the lower surface of the tuyere passage 11 after being charged into the tuyere passage 11.
Is provided. A viewing window 22 having a cock 41 that can be opened and closed is provided at the rear end of the inner tube 16.

[0009] Flanges 25 and 26 are provided at the tip of the outer tube 17 and the inner tube 16 slightly projecting from the front end of the outer tube 17, respectively. On the front side of the base of the flange portion 25 and on the rear side of the base of the flange portion 26, the bases of the front arm 23 and the rear arm 24 of the link mechanism 13 are arranged so that each rotation axis is orthogonal to the center axis of the inner tube 16. It is rotatably mounted. The distal end of the rear arm 24 is rotatably attached to the front end of the front arm 23.
The distal end of 3 forms a mounting portion 27 that rotatably supports the arc-shaped members 28 and 28a via a mounting member.
As shown in FIG. 2, an arc-shaped member 28 or an arc-shaped member 28a is attached to an attachment portion 27 of each link mechanism 13, and the arc-shaped member 28 and the arc-shaped member 28a are arranged adjacent to each other. The front arm 23 is made of two plates, and the rear arm 24 and the arc-shaped member 2
The mounting portions 8, 28a are sandwiched and supported from both sides. With this configuration, the inner pipe 16 is moved back and forth with respect to the outer pipe 17, and the substantial distance of each of the mounting portions 27 provided radially outward from the axis of the double pipe 12 is changed. be able to.

On the rear side along the outer periphery of the flange portion 25 and on the front side along the outer periphery of the flange portion 26, grooves 30, 3 are provided.
An annular closing member 15 a, 32 a formed with 1 is provided, fixes the end of the fireproof cloth 14, and closes the tuyere passage 11. The refractory cloth 14 having a certain thickness and covering the plurality of link mechanisms 13 is disposed so as to cover an annular body formed by the arc-shaped members 28 and 28a attached to each link mechanism 13 in a cylindrical shape. Both ends of the refractory cloth 14 are
Steel wires 49 and 50 are fastened and fixed to the grooves 30 and 31 of 5a and 32a. The fastening members 15, 32 are constituted by the closing members 15a, 32a and the steel wires 49, 50 for fastening the ends of the refractory cloth 14 to the closing members 15a, 32a. In addition, fireproof cloth 1
Numeral 4 is made of fire-resistant fiber having a little elasticity such as alumina fiber, and is fixed in a slightly slack state at the time of attachment so that the ring formed by the arc-shaped members 28 and 28a becomes taut when the diameter is expanded. ing. With this configuration, the fire-resistant cloth 14 can be mounted and replaced easily and quickly, and the gap can be eliminated to ensure sealing. At the lower part of the front end of the closing member 15a, an arc-shaped sliding assist in which the distance from the center of the double pipe 12 to its sliding part is larger than the radius of the fireproof cloth 14 provided in a cylindrical shape when the diameter thereof is reduced. The members 33 are provided at two places at an angle of 60 degrees. When the tuyere sealing device 10 is inserted into the tuyere passage 11 at the time of the calm, the back of the double pipe 12 is slightly raised, and the sliding auxiliary member 33 is advanced while sliding in the tuyere passage 11. , The fireproof cloth 14 is
Can be prevented from being broken by sliding.

As shown in FIGS. 2, 3A and 3B,
The arcuate member 28 has a bifurcated portion 3 having both ends bifurcated.
5 is formed, and the end of the arc-shaped member 28a having a uniform rectangular cross section can be fitted into the U-shaped inner groove 47 of the branch portion 35. By engaging the ends of the arc-shaped members 28, 28a, the adjacent arc-shaped members 28, 28a
A wrap portion 34 (see FIGS. 4A and 4B)
(Shaded portion). As shown in FIGS. 3 and 4, inside the branch portion 35 of the arc-shaped member 28, when the arc-shaped members 28 and 28a move toward the center of the double pipe, the ends of the arc-shaped member 28a A support plate 39 abutting from the inside is attached. Each arc-shaped member 2 is supported by the support plate 39.
Since the both end portions of the tuyere 8a are held, it is possible to prevent breakage or bending of each part of the tuyere sealing device 10 at the time of the calm before using the tuyere sealing device 10 at the time of the calm.

As shown in FIGS. 5A and 5B, at the rear of the double tube 12, the cotter 36 for moving the outer tube 17 in the axial direction with respect to the inner tube 16 and holding the same is retracted. Mechanism 1
8 are provided. A horizontal fixing plate 38 is provided on one side of the rear part of the inner pipe 16, and a horizontal fixing plate 38 located on the rear side of the rear end of the outer pipe 17 is provided on one side of the rear end of the outer pipe 17. Parallel fixing plates 43 and 44 sandwiching a gap from above and below are provided. The fixing holes 45 are formed in the parallel fixing plates 43 and 44 so as to be longer than the length of the horizontal fixing plate 38 in the front-rear direction and to allow the cotter 36 to be inserted from above. Have been. The inner tube 16 is the outer tube 17
, The annular body formed by the arc-shaped members 28 and 28a expands in diameter, and the refractory cloth 14 seals the tuyere passage 11. Therefore, the tuyere sealing device 1 during the cold season
0, the cotter 36 is fixed to the parallel fixing plates 43, 44.
At a position forward of the horizontal fixing plate 38 located in the fixing hole portion 45. In this way, the horizontal fixing plate 38
And the inner pipe 16 to which it is fixed is moved rearward with respect to the outer pipe 17 so that the tuyere sealing device 10 is closed at the time of the calm.
1 can be fixed in a sealed state. Also, when removing the tuyere sealing device 10 at the time of the cold,
6 is fitted to a position behind the horizontal fixing plate 38 located in the fixing hole 45. Then, the horizontal fixing plate 38 and the inner pipe 1
6 can be moved forward to release the sealed state.

As shown in FIG. 1, a viewing window 22 provided at the rear end of the inner tube 16 has a through hole (not shown) provided in an openable and closable cock 41 screwed to communicate with the inner tube 16. have. The cock 41 has a through hole on the side. By opening the cock 41, the through hole and the through hole communicate with each other.
The tuyere tip and the inside of the blast furnace can be visually observed through the through hole and the tip of the inner tube 16. At the rear end of the inner tube 16,
A blow port (not shown) for blowing gas such as nitrogen gas from the tip of the inner pipe 16 to remove foreign substances such as coke powder and slag attached to the tip of the inner pipe 16 is provided. A high-pressure nitrogen gas pipe or the like is temporarily joined with a flexible hose such as a rubber hose, for example, and nitrogen gas or the like is sent before inspection of the tuyere tip to blow off foreign substances.

Next, the operation of the arc-shaped members 28 and 28a in the use state of the tuyere sealing device 10 at the time of a calm will be described. As shown in FIG. 4A, when the tuyere sealing device 10 is inserted into the tuyere passage 11 at the time of the calm, that is, the inner pipe 16 moves forward with respect to the outer pipe 17 and the link mechanism 1
When the mounting portion 27 moves to the axial center side of the double pipe 12, the arc-shaped member 28a becomes the branch portion 35 of the arc-shaped member 28.
Both ends are in contact with a support plate 39 provided inside the box. At this time, the outer corner portion 40 of the arc-shaped member 28 is chamfered so as not to damage the refractory cloth 14 in contact with the arc-shaped member 28. Further, the arc-shaped member 28a is also provided with a chamfer (not shown) not so large as the chamfer of the arc-shaped member 28 at the outer corner so as not to damage the refractory cloth 14 which comes into contact therewith. As shown in FIG. 4 (B), when the tuyere sealing device 10 is fixed to the tuyere passage 11 at the time of calm, that is, the inner pipe 16 moves rearward with respect to the outer pipe 17 and the mounting portion 27 When moved in a direction away from the axis of the double pipe 12, the arc-shaped members 28, 28a form an annular body. In this case, the circumferential distance L between the bottom 48 of the inner groove 47 of the arc-shaped member 28 and the end of the arc-shaped member 28a increases, but since the wrap portion 34 is provided, the arc-shaped member 2
The ends of 8, 28a can maintain a polymerized state. Therefore, when the fireproof cloth 14 is pressed against the tuyere passage 11, the pressing force outward in the radial direction can be made uniform, and the sealing performance can be improved.

The embodiment according to the present invention has been described above. However, the present invention is not limited to the above-described embodiment.
Is provided on the front arm 23, but may be provided on the rear arm 24. In addition, although the cotter 36 is used as the advance / retreat holding mechanism, it is also possible to form a male screw portion at the rear of the outer tube 17 and rotate the nut screwed to this to advance / retreat the inner tube 16.

[0016]

According to the tuyere sealing device of the present invention, the fireproof cloth covering the outside of the tuyere is provided with the arc-shaped member provided at the mounting portion of the link mechanism. The mouth passage can be abutted with a uniform pressing force without any gap, and can be easily mounted. In the tuyere sealing device according to the second aspect of the present invention, since the wrap portion that meshes with the adjacent arc-shaped member is provided, it is possible to prevent a gap from being generated in the seal portion when the arc-shaped member is expanded in diameter. In addition, the tuyere passage can be uniformly sealed. In the tuyere-sealed tuyere sealing device according to the third aspect of the present invention, since the advancing / retracting holding mechanism using the cotter is provided at the rear portion of the double pipe, the operation of increasing and decreasing the diameter of the arc-shaped member can be performed easily. be able to. In the tuyere-sealed tuyere sealing device according to the fourth aspect, the rear part of the inner pipe is provided with an openable and closable viewing window and a blowing port.
Foreign matter at the front end of the inner tube is removed by wind pressure, and thereafter, the condition inside the furnace can be surely checked from the viewing window.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a tuyere sealing device at the time of a calm according to an embodiment of the present invention.

FIG. 2 is a side cross-sectional view of the tuyere sealing device at the time of cold stop.

FIGS. 3A and 3B are explanatory views of the arc-shaped member of the tuyere-portion sealing device at the time of the outage, respectively.

4 (A) and 4 (B) are explanatory views showing a use state of the tuyere sealing device at the time of the outage.

FIGS. 5A and 5B are a plan view and a front view, respectively, showing an advancing and retracting holding mechanism of the tuyere sealing device at the time of the outage;

FIGS. 6A to 6C are explanatory views of a tuyere sealing device according to a conventional example.

[Explanation of symbols]

10: tuyere sealing device at the time of calm, 11: tuyere passage, 1
2: Double pipe, 13: Link mechanism, 14: Fireproof cloth, 15:
Fastening means, 15a: closing member, 16: inner tube, 17: outer tube, 18: advance / retreat holding mechanism, 19: support portion, 22: viewing window, 23: front arm, 24: rear arm, 25, 2,
6: flange portion, 27: mounting portion, 28, 28a: arc-shaped member, 30, 31: groove portion, 32: fastening means, 32a:
Closing member, 33: slide assisting member, 34: wrap portion, 3
5: branch, 36: cotter, 38: horizontal fixing plate, 39:
Support plate, 40: corner, 41: cock, 42: gripping member,
43, 44: parallel fixing plate, 45: fixing hole, 47: inner groove, 48: bottom, 49, 50: steel wire

Continued on the front page (72) Inventor Toshio Yukishiro 11-5, Kiyosuenishi-machi, Shimonoseki-shi, Yamaguchi (72) Inventor Hisanori Watanabe 796-132, Oma, Ogaki-machi, Onga-gun, Fukuoka (72) Inventor Mitsuyuki Maekawa Kitakyushu, Fukuoka 30-43 Yoshaku-cho, Wakamatsu-ku (72) Inventor Masashi Takakura 1-5-21 Hagiwara, Yawata-nishi-ku, Kitakyushu-shi, Fukuoka Prefecture Inside the Anakyu Dormitory, Yamakyu Corporation (72) Inventor Katsushi Moriya 11-1, Showa-cho, Kure-shi, Hiroshima, Japan New Steel Co., Ltd.Kure Works (72) Inventor Eiji Inohara 11-1, Showa-cho, Kure City, Hiroshima Prefecture Nisshin Steel Co., Ltd.Kure Works, (72) Inventor Yasuhiro Yamada 11-1, Showa-cho, Kure City, Hiroshima Prefecture, Japan New Steel Co., Ltd.Kure Works (72) Inventor Yoshiharu Tanaka 11-1, Showa-cho, Kure City, Hiroshima Prefecture

Claims (4)

[Claims] 1. A tuyere-sealing-portion sealing device for charging a tuyere passage when a blast furnace is shut off to close the tuyere passage and prevent air from being sucked into the blast furnace. The inner pipe and the outer pipe are provided at the tip of the double pipe, and the inner pipe is moved relatively to the outer pipe, whereby the radially outer mounting portion of the double pipe is attached. A plurality of link mechanisms whose substantial distance from the axis changes, an arc-shaped member provided at an attachment portion of each of the link mechanisms, and a ring formed by the arc-shaped member attached to each of the link mechanisms. A fire-resistant cloth arranged in a tubular shape and having a certain thickness; and fastening means provided on a front side and / or a rear side of the link mechanism to fix an end of the cylindrical fire-resistant cloth. Characteristic tuyere sealing device at rest. 2. The tuyere sealing device according to claim 1, wherein the adjacent arc-shaped members are provided with a lap portion that meshes with each other. . 3. The tuyere sealing device according to claim 1, wherein the outer tube is advanced and retracted in the axial direction with respect to the inner tube at a rear portion of the double tube. A tuyere sealing device at the time of rest of wind, wherein a forward / backward holding mechanism by a cotter is provided. 4. The tuyere sealing device according to any one of claims 1 to 3, wherein a rear portion of the inner tube includes:
An opening / closing viewing window, and a blowing port for blowing gas from the tip of the inner pipe to remove foreign matter adhering to the tip of the inner pipe, and a tuyere sealing device at rest during wind-down. .