JP2001289572A - Sealing device between throat hoods of molten metal furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an releasable sealing device for enclosing the gap between the throat hoods of a molten reduction furnace or a converter in which durability of a packing is enhanced and gas leakage is prevented. SOLUTION: The sealing device comprises an inner seal connected with a hood side seal metal to surround a hood, and an outer seal for sealing the gap between the throat hoods on the outside thereof wherein each seal is provided with an elevating/lowering mechanism. The inner seal is provided with a mechanism for hooking a throat side seal metal on the hood side, and a heatproof plate covering a hood side seal packing upon opening. A seal metal protective skirt and its elevating/lowering mechanism are provided between the inner seal and the hood and an outer seal packing and its inclining/fastening mechanism are provided at a lower part of the outer seal. A gas introduction opening for introducing inert gas between the inner and outer seals is preferably provided. Furthermore, a dust seal is preferably projected from the hood side seal metal. Safety operation is ensured even if the inner pressure of a furnace is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an openable and closable sealing device for sealing a space between a furnace port and a hood in a molten metal furnace such as a smelting reduction furnace or a converter.

[0002]

2. Description of the Related Art In a molten metal furnace such as a smelting reduction furnace for metals and a converter for refining, a hood is disposed above a furnace port to extract gas generated in the furnace. The space between the furnace port and the hood is sealed during the reaction in the furnace, and is opened when charging the raw materials and discharging the molten metal. For this reason, a seal device that can be opened and closed is required between the furnace port hoods. As a conventional device, a molten metal furnace hermetic sealing device disclosed in Japanese Patent Application Laid-Open No. 4-371510 by the present applicant is known, and the structure thereof is shown in FIGS. FIG. 8 shows a state before sealing, and FIG. 9 shows a state after sealing.

[0003] As shown in FIG. 8, a furnace port side seal fitting 3 having a packing 61 projecting therefrom is attached to a periphery of a furnace port 2 of a molten metal furnace 1. A hood 7 is arranged above the furnace port 2. The hood 7 is fixed to a hood support arm 62, and the hood support arm 62 is
4 is suspended by a hanging tool 65. A cylindrical sealing metal protection skirt 8 is disposed around the hood 7 so as to be able to move up and down.
A hood-side sealing hardware 25 is attached to the lower peripheral edge of the seal hardware protecting skirt 8.

A lifting bracket 67 is mounted on the hood support arm 62 via a lifting cylinder 66, and the skirt 8 for protecting the seal hardware and the hood-side sealing hardware 25 are mounted on the lifting bracket 67. The hood-side sealing hardware 25 is attached via a pressing cylinder 68. The mooring pin 35 is attached to the lifting bracket 67 so as to be rotatable by the swing cylinder 56. Further, the lifting bracket 67 and the hood support arm 6
The space between the two is sealed by a tubular expansion joint 69.

In order to seal the space between the furnace port 2 and the hood 7,
As shown in FIG. 9, the lifting bracket 67 is lowered by the lifting cylinder 66, and the hood-side seal hardware 25 is
1, the mooring pin 35 is swung by the swinging cylinder 56 to engage with the notch groove 5 of the furnace port flange 4. After that, the pressing cylinder 68 is extended, the hood-side seal fitting 23 is pressed against the furnace port-side seal fitting 3, and the seal 61 is sealed with the packing 61.

When the pressing cylinder 68 is further extended, the elevating bracket 67 and the mooring pin 35 are raised, and the enlarged diameter head 36 of the mooring pin 35 is pressed against the furnace port flange 4, and the furnace port side seal fitting 3 and the hood side The seal hardware 25 is moored. In this state, the hood 7 and the hood support arm 62 also move together with the elevation of the lifting bracket 67. As a result, the hanger 65 floats from the frame 64 of the hood moving carriage 63, and the expansion joint 69 contracts by the gap between the furnace port flange 4 and the enlarged diameter head 36. Thereby, the space between the furnace port 2 and the hood 7 is hermetically sealed.

[0007]

SUMMARY OF THE INVENTION The above-mentioned conventional apparatus has a furnace port 2.
Since the gasket 61 is provided, there is a problem that the gasket 61 is easily deteriorated by the high-temperature gas at the time of ignition in the half-open state of the seal. When the packing 61 deteriorates, the seal between the furnace mouth side seal fitting 3 and the hood side seal fitting 25 becomes incomplete, and particularly in an operation in which the furnace internal pressure is increased,
There was concern about the danger of leakage of harmful gases such as CO gas.

The problem to be solved by the present invention is
Openable and closable sealing device for sealing between the furnace port and the hood in molten metal furnaces such as smelting reduction furnaces and converters, improving the durability of packing and preventing gas leakage more effectively. And stabilize operations.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is an openable and closable device for sealing between a furnace port of a molten metal furnace and a hood disposed above the furnace port. An annular furnace-side seal fitting provided at the furnace port, an annular hood-side seal fitting provided outside the hood, and a hood connected to the hood-side seal fitting to surround the hood and to connect between the furnace port and the hood. It has an inner seal to seal, and an outer seal to seal between the furnace port and the hood outside the inner seal. The inner seal packing is attached to the hood-side seal hardware all around the lower surface. Each of the seals is provided with an elevating mechanism, the inner seal is a mooring mechanism for mooring the furnace port side seal hardware and the hood side seal hardware in close contact with each other, a heat insulating plate covering the inner seal packing when opened, and Heat insulation Is provided between the inner seal and the hood. A seal metal protection skirt is provided between the inner seal and the hood. A sealing device between a furnace port hood of a molten metal furnace, wherein a seal packing and a tilting tightening mechanism thereof are additionally provided.

A gas inlet for introducing and pressurizing an inert gas into a seal chamber formed by being surrounded by the inner seal and the outer seal is preferably provided in the outer seal. Further, it is preferable that a dust seal protrudes from the inside of the inner seal packing of the hood side seal hardware.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The apparatus of the present invention will be described with reference to FIGS. The apparatus of the present invention comprises a furnace port 2 of a metal melting furnace 1.
And a hood 7 disposed above the furnace port 2 for sealing between the furnace port hoods that can be opened and closed.
FIG. 1 shows a state in which a hood 7 is arranged above the furnace port 2 and the space between the furnace ports hood is open. FIG. 2 shows a state sealed by the device of the present invention.

As shown in FIG. 1, an annular furnace port side seal fitting 3 is attached to the furnace port 2, and an annular hood side seal fitting 25 is provided outside the hood 7. Hood side seal fitting 25 has inner seal packing 2 around the entire lower surface.
When the hood 7 is lowered with the hood 6 attached, FIG.
As described above, the hood-side seal hardware 25 and the furnace port-side seal hardware 3 are shaped to be in close contact with each other via the packing 26. In this example, the packing 26 is an inflatable seal for injecting gas into the internal cavity.

When the hood-side seal fitting 25 is brought into close contact with the furnace port-side seal fitting 3, an inner seal is formed which is connected to the hood-side seal fitting 25, surrounds the hood 7, and seals between the furnace port 2 and the hood 7. You. An outer seal for sealing between the furnace port 2 and the hood 7 is formed outside the inner seal. Each of the inner seal and the outer seal is provided with a lifting mechanism.

In this embodiment, as shown in FIG. 3, the outside of the hood outer cylinder 9 is surrounded by a water-cooling ring 10, and as shown in FIG. 1, an inner seal support frame 24 connected to a hood-side seal fitting 25 and a connection to the upper end thereof. The inner joint is constituted by the expansion joint 22 and the frame 20 and the inner inflatable seal 21.

An inner seal lifting cylinder 18 is mounted on the beam 17 by engaging with a flange 19 connected to the inner seal support frame 24, and the hood-side seal hardware 25 is raised and lowered by the inner seal lifting cylinder 18. At this time, the inner inflatable seal 21 is released and flattened, and moves without contacting the outer periphery of the water cooling ring 10. In addition, it is also possible to seal with an expansion joint 23 instead of the inner inflat seal 21.

The inner seal includes a mooring mechanism for mooring the furnace port side seal hardware 3 and the hood side seal hardware 25 in close contact with each other, a heat insulating plate 31 covering the inner seal packing 26 when opened, and a heat insulating plate 31. Is provided. In this example, the mooring mechanism swings the mooring pin 35 to engage with the notch 5 of the furnace opening flange 4 as shown in FIGS. 1 and 2, pulls up the mooring pin 35 by the mooring pin cylinder 32, and enlarges the enlarged head. A mechanism for bringing the portion 36 into close contact with the furnace opening flange 4 is provided. The mooring pin cylinder 32 is mounted on the flange 19.

In this embodiment, the mooring pin 35 is rotated by about 150 ° by a rocking motor (not shown) mounted on the support block 33.
When swinging is performed, if a small swing angle does not cause any problem, as shown in FIG. 4, a rod of a swing cylinder 56 pivotally supported via a bracket 57 to a support block 33 connected to a mooring pin 35. The tip may be pivotally supported on the mooring pin 35 via the bracket 58, and the mooring pin 35 may be swung by the swing cylinder 56.

In this embodiment, the heat insulating plate 31 is attached to the tip of the arm 30 as shown in FIGS. 1 and 2, and the arm 30 is rotatably supported by the bracket 29 of the flange 19,
The mechanism is rotated by a heat-insulating plate rotating cylinder 28 pivotally supported by the inner seal support frame 24.

Between the inner seal and the hood 7, there is provided a seal metal protection skirt 8 whose lower end abuts on the furnace port 2 inside the hood-side seal metal 25, and a lifting mechanism thereof. As shown in FIG. 1, in this embodiment, the seal metal protection skirt 8 is connected to a skirt elevator 15 inside the water-cooling ring 10 and moves up and down. Skirt elevator 1
5 moves up and down along a guide 16 attached to a beam 17,
When the seal metal protection skirt 8 is lowered via the rod 13 and the joint 12, the lower end is located inside the hood-side seal metal 25 and contacts the furnace port 2 as shown in FIG. 2.

In this embodiment, the outer seal includes an outer seal inner cylinder 38 surrounding the outside of the water cooling ring 10 as shown in FIG.
As shown in FIG. 2, an outer seal outer cylinder 39 moving up and down on the outer periphery of the outer seal inner cylinder 38, an outer seal packing 47 connected to a lower portion thereof, and an outer inflate seal 40
It is composed of The outer seal packing 47 is moved up and down by the outer seal elevating cylinder 41 and, after being lowered, is brought into close contact with the furnace port outer peripheral seal ring 6 by a tilting tightening mechanism as shown in FIG. The outer inflatable seal 40, like the inner inflatable seal 21, is depressurized and flattened when ascending and descending, and does not contact the inner cylinder 38.

The tilt tightening mechanism includes a tilt cylinder 45 pivotally supported by a bracket 43 above the outer seal support frame 42;
It comprises a tilting frame 46 pivotally supported by a bracket 44 below the outer seal support frame 42, an outer seal release cylinder 48, and a fastener. The outer seal release cylinder 48 has a lower pin locked by a long hole of the tilting frame 46, and as shown in FIG.
By turning the tilting frame 46 at 5, it is lowered. The fastening tool includes a wire rope 54 and a fastening cylinder 53 as shown in FIGS.

The outer seal packing 47 is made of a cylindrical rubber as shown in FIGS. 5 and 6, and stands upright as shown in FIG. 6 in a free state, and is lowered when lowered as shown in FIG. It is attached so as to surround the ring 6. Inside and outside of the outer seal packing 47, as shown in FIGS. 5 and 6, an inner strip 50 and an outer strip 51 are arranged over the entire circumference.

The inner strip 50 and the outer strip 51 are shown in FIG.
, And can be tilted by a hinge 55 as shown in FIG. As shown in FIG. 5, a wire rope 54 is wound around the outer periphery of the outer strip 51, and both ends of the wire rope 54 are connected to the tightening cylinder 43. Reference numeral 52 denotes a wire holding ring, and the outside is cut off in a portion A of FIG.

In the apparatus of the present invention, a seal chamber (49 in FIG. 2) formed by being surrounded by the inner seal and the outer seal.
It is preferable that a gas inlet for introducing an inert gas and pressurizing the gas is provided in the outer seal. The gas inlet is provided, for example, in the outer seal outer cylinder 39, and a valve is attached thereto. A pressurized inert gas such as nitrogen gas is introduced at the time of sealing, and the gas is led out at the time of opening. Further, it is preferable that a dust seal 27 protrudes inside the inner seal packing 26 of the hood side seal fitting 25.

Next, a description will be given of a procedure when the apparatus of the present invention is changed from the opened state of FIG. 1 to the sealed state of FIG. In FIG. 1, first, the seal metal protection skirt 8 is lowered by the skirt elevator 15, and the lower end thereof is brought into contact with the furnace port 2 inside the hood-side seal metal 25. After the heat is shut off by the skirt 8, the outer seal packing 47 and its tilting and tightening mechanism are lowered by the outer seal elevating cylinder 41, and the heat insulating plate 31 is swung by the heat insulating plate rotating cylinder 28 so that the inner seal packing 26 is removed. Retreat from below.

Thereafter, the flange 19 is lowered by the inner seal lifting cylinder 18 so that the hood-side
Is brought into contact with the furnace mouth side seal fitting 3. At this time, the outer seal packing 47 and its tilting and tightening mechanism are simultaneously lowered, and the packing 47 comes to a position facing the furnace port outer seal ring 6. Next, the mooring pin 35 is swung to engage with the notch 5 of the furnace opening flange 4, and the mooring pin cylinder 3
2 to raise the metal parts 3 and 25 in close contact with each other.

Further, the tilting tightening mechanism is operated to bring the outer seal packing 47 into contact with the furnace port outer seal ring 6 and tighten. First, the outer seal release cylinder 4 is tilted by the tilting cylinder 45.
When the inner strip 50 is lowered, the inner strip 50 is inclined by its own weight as shown in FIG. At this time, the margin for shortening the circumference of the tip of the inner strip 50 is absorbed by the gap S in FIG. Next, the wire rope 54 is pulled by the tightening cylinder 53. Then the outer strip 51 tilts,
The distal end of the outer seal packing 47 is pressed and fastened to the furnace port outer seal ring 6 while being compressed in the circumferential direction.

Then, the insides of the inner and outer inflatable seals 21 and 40 are pressurized to strengthen the seals. When the inner seal packing 26 is an inflate seal, the inside of the packing 26 is also pressurized.
Further, if necessary, the seal chamber 49 between the inner seal and the outer seal is pressurized with an inert gas to perform a stronger seal.

In order to change from the sealing state shown in FIG. 2 to the opening state shown in FIG. 1, the pressurization of the seal chamber 49 and the pressurization of the inflate seal are first released, and the tightening mechanism is operated. The outer seal packing 47 is opened. At this time, when the tightening cylinder 53 is pushed and the wire rope 54 is loosened, the outer strip 51 and the packing 47 stand upright by themselves. Then, the outer seal releasing cylinder 48 is pushed up by the tilting cylinder 45, and the inner strip 50 is erected.

Thereafter, the mooring pin 35 is removed and swinging, the hood-side seal fitting 25 is raised by the inner seal lifting / lowering cylinder 18, and the heat insulating plate 31 is swung to be positioned below the inner seal packing 25. Then, the outer seal is raised, and the seal metal protection skirt 8 is raised.

[0031]

The apparatus of the present invention is an openable and closable sealing device for sealing between the furnace port and the hood in a molten metal furnace such as a smelting reduction furnace or a converter, wherein the furnace port 2 and the hood 7 are opened halfway. In the state, as shown in FIG.
5 is covered with the heat insulating plate 31, the inner seal packing 26 is not exposed to the high-temperature gas at the time of ignition, and the deterioration is significantly suppressed. Further, the dust seal 27 described later is also prevented from deteriorating due to the heat insulating effect.

When the space between the furnace hoods is sealed, the gas generated in the furnace hardly leaks due to the double sealing, and the operation is stable even when the furnace pressure is increased. Also, by filling an inert gas at a pressure higher than the furnace pressure in a seal chamber between the inner seal and the outer seal, even if the sealing performance is reduced, CO2 is reduced.
The possibility of external leakage of gas generated in the furnace containing harmful components such as harmful components is eliminated.

Further, by providing a dust seal,
The seal packing is more effectively prevented from heat, and is not exposed to high-temperature dust generated in the furnace, so that so-called dust attack is prevented, and durability is further improved. This dust seal is also covered by the heat insulating plate, and its deterioration is suppressed.

[Brief description of the drawings]

FIG. 1 is an overall vertical sectional view showing an example of the apparatus of the present invention when opened.

FIG. 2 is an overall longitudinal sectional view showing an example of the device of the present invention at the time of sealing.

FIG. 3 is a sectional view taken along the line AA of FIG. 1 showing an example of the device of the present invention.

FIG. 4 is an explanatory view showing an example of a mooring mechanism in the apparatus of the present invention.

FIG. 5 is an overall explanatory view showing an example of a tilt tightening mechanism of an outer seal packing in the device of the present invention.

FIG. 6 is a partial explanatory view showing an example of a tilt tightening mechanism of an outer seal packing in the device of the present invention.

FIG. 7 is another partial explanatory view showing an example of the tilting and tightening mechanism of the outer seal packing in the device of the present invention.

FIG. 8 is an overall sectional view of the conventional device when it is opened.

FIG. 9 is an overall sectional view of a conventional device at the time of sealing.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Molten metal furnace 2 ... Furnace opening 3 ... Furnace opening side sealing hardware 4 ... Furnace opening flange 5 ... Notch 6 ... Furnace opening outside seal ring 7 ... Hood 8 ... Sealing metal protection skirt 9 ... Hood outer cylinder 10 ... Water cooling ring 11 ... dust seal 12 ... joint 13 ... rod 14 ... expansion joint 15 ... skirt elevator 16 ... guide 17 ... beam 18 ... inner seal elevating cylinder 19 ... flange 20 ... frame 21 ... inner inflate seal 22, 23 ... expansion joint 24 ... inner Seal support frame 25 ... Hood side seal hardware 26 ... Inner seal packing 27 ... Dust seal 28 ... Heat-insulating plate rotating cylinder 29 ... Bracket 30 ... Arm 31 ... Heat-insulating plate 32 ... Mooring pin cylinder 33 ... Support block 34 ... Long hole 35 ... Mooring pin 36 ... enlarged diameter head 37 ... pivot 38 ... outer seal inner cylinder 39 ... outer seal outer cylinder 40 Outer inflate seal 41 ... Outer seal elevating cylinder 42 ... Outer seal support frame 43,44 ... Bracket 45 ... Tilting cylinder 46 ... Tilting frame 47 ... Outer seal packing 48 ... Outer seal release cylinder 49 ... Seal chamber 50 ... Inner strip 51 ... Outer strip 52 ... Wire holding ring 53 ... Tightening cylinder 54 ... Wire rope 55 ... Hinge 56 ... Swing cylinder 57,58 ... Bracket 59,60 ... Dust seal 61 ... Packing 62 ... Hood support arm 63 ... Hood moving carriage 64 ... Frame 65 Lifting tool 66 Lifting cylinder 67 Lifting bracket 68 Press cylinder 69 Expansion joint

Continuing from the front page (72) Inventor Yukinori Shigeyama 20-1 Shintomi, Futtsu Nippon Steel Corporation Technology Development Division (72) Inventor Yukimasa Tanaka 46-59 Nakahara, Toba-ku, Kitakyushu Nippon Steel Plant Design Co., Ltd. In-company (72) Inventor Yoshiharu Nakano 46-59, Ohara Nakahara, Tobata-ku, Kitakyushu Nippon Steel Plant Design Co., Ltd.F term (reference) 4K001 AA10 GA01 GA02 GA06 GA10 GB12 4K002 BA02 4K012 CA04 CA10 4K056 AA02 BA06 CA02 DC03 DC11

Claims (3)

[Claims] 1. An openable and closable device for sealing between a furnace port of a molten metal furnace and a hood disposed above the furnace port, comprising an annular furnace port side seal fitting provided at the furnace port. An annular hood-side seal hardware provided outside the hood, an inner seal connected to the hood-side seal hardware to surround the hood and seal between the furnace opening and the hood, and a furnace opening outside the inner seal. An outer seal that seals between the hoods, an inner seal packing is attached to the entire periphery of the lower surface of the hood-side seal hardware, and an elevating mechanism is attached to each of the inner seal and the outer seal. A mooring mechanism for mooring the furnace mouth side seal hardware and the hood side seal hardware in close contact with each other, a heat insulating plate covering the inner seal packing when opened, and a rotating mechanism for the heat insulating plate are provided. while The seal metal protection skirt whose lower end is in contact with the furnace port inside the hood-side seal metal and its elevating mechanism are provided, and the outer seal packing and its tilting tightening mechanism are provided below the outer seal. Sealing device between furnace port hoods of molten metal furnace. 2. A gas inlet for introducing and pressurizing an inert gas into a seal chamber formed by being surrounded by an inner seal and an outer seal is provided in the outer seal. The sealing device between furnace mouth hoods of the molten metal furnace according to the above. 3. The sealing device between the furnace port hoods of a molten metal furnace according to claim 1, wherein a dust seal is provided on the inside of the inner seal packing of the hood-side sealing hardware.