JP2914785B2 - Hermetic sealing equipment for molten metal furnaces - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic sealing device between a furnace opening of a molten metal furnace such as a pressurized converter and a pressurized smelting reduction furnace and an exhaust gas hood.

[0002]

2. Description of the Related Art For a hermetic sealing device between a furnace opening of a pressurized molten metal furnace 1 and an exhaust gas hood 7, a furnace opening flange 2 and a skirt side flange 24 are fastened with screws 25, and a skirt 8 is provided.
There is a method in which packing 27 is provided on the sliding portion 26 between the hood 7 and the hood 7 to seal it (for example, Japanese Patent Application Laid-Open No. 1-25289
No. 1 and FIG. 5). This is because the packing 28 provided between the furnace opening flange 2 and the skirt side flange 24 is sealed by tightening a screw, and the hood 7 and the skirt 24 are slidably sealed with a gland packing or the like. Flange 2 for sliding part with hood
By installing an expansion joint 18 between the positions 9, the displacement between the skirt 8 and the furnace body 1 is absorbed.

[0003]

However, the above sealing device has a problem that a leak is generated between the furnace port flange and the skirt side flange and from the sliding seal portion of the skirt and the hood. That is, since the fastening portion of the furnace port flange and the skirt side flange and the seal packing are separated from each other, the tightening force is not sufficiently transmitted to the seal portion, and a sufficient seal cannot be obtained when the flange is deformed. There was a leak. In addition, the sliding seal between the skirt and hood is sealed with gland packing, so the elasticity of the sealing material is low, and it leaks even if the skirt or hood is slightly displaced or deformed, and tightens the gland packing to prevent leakage. When the force was increased, the sliding resistance increased, which sometimes hindered the lifting and lowering of the skirt.
Further, since screws are used for fastening the furnace opening flange and the skirt side flange, there is also a problem such as dust getting into the screw portion.

Accordingly, the present invention provides a hermetic sealing device for a molten metal furnace which can completely seal the furnace opening, the sliding portion of the skirt and the hood, and does not involve dust in the furnace closing device. is there.

[0005]

A closed sealing device for a molten metal furnace according to the present invention for solving the above-mentioned problems is also shown in FIG.
In such a way, it is arranged on the furnace mouth of the molten metal furnace and on the furnace of the molten metal furnace.
Close the gap with the hood 7 connected to the exhaust gas duct 9
A skirt 8 is arranged below the hood 7 to be closed.
The expansion joint 1 between the skirt 8 and the hood 7
Skirt 8 connected to the skirt 8 with the
To the metal fittings 10 via seal packing
The furnace port seal metal 4 is provided on the molten metal furnace side, and the furnace port
An elevating device (elevating cylinder 16) is provided above the seal hardware 4.
The elevating bracket 15 that moves up and down by the
The racket 15 is provided with a seal metal pressing mechanism (press cylinder 1).
2) through the skirt-side sealing hardware 10 and the furnace
A detachable mooring mechanism 11 is suspended from the mouth seal fitting 4 and
The raising and lowering bracket 15 is raised and lowered, and
The skirt side seal hardware 10 is furnace-opened by the object pressing mechanism.
Pressing on metal 4 to hermetically seal between both seals
It is characterized by.

[0006]

The hermetic sealing apparatus for a molten metal furnace of the present invention constructed as described above requires a push-up mechanism to press directly above a sealing material disposed between a furnace mouth seal fitting and a skirt side seal fitting of the molten metal furnace. Can be pressed to a certain extent,
The crushing force of the sealing material can be effectively obtained, and a complete seal between the molten metal furnace and the skirt can be obtained. Further, since an expansion joint is provided between the skirt and the hood, these can also be completely sealed. In addition, when the pressure in the furnace becomes high, a reaction force of gas pressure is applied to the furnace body and the hood, but this is offset by the mooring mechanism connecting the furnace body and the hood, and is canceled out. Is minimally involved.

[0007] Thus, the molten metal furnace and the hood can be completely sealed, and the pressure in the furnace can be raised to a sufficient height that requires the furnace. Further, since a screw can be used for the fastening device at the furnace opening, for example, a cylinder or the like can be used, there is no biting by dust.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the hermetic sealing device for a molten metal furnace according to the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a hermetic sealing device for a molten metal furnace according to the present invention. 1 is a molten metal furnace, 2 is a furnace opening flange, 3 is a furnace fitting, 4 is a furnace sealing metal, and a groove 6 for an O-ring 5 is provided on the surface thereof. Reference numeral 7 denotes a hood for exhaust gas, 8 denotes a skirt, and 9 denotes a duct. Reference numeral 10 denotes a skirt-side seal metal, which is connected to the skirt 8, and tightly seals with the furnace port seal metal 4 via an O-ring 5. Reference numeral 11 denotes a mooring mechanism for the furnace port flange 2 and a plurality of hammer-shaped pins 11a and its swing cylinder 1
1b, the hammer-shaped pin 11a is inserted into a U-shaped groove (not shown) of the furnace opening flange 2. The seal hardware pressing mechanism 12 has a plurality of pressing cylinders 12a arranged on the entire circumference of the skirt-side seal hardware 10, so that the skirt 8, the skirt-side seal hardware 10, and the expansion joint mounting hardware 13 can be raised and lowered. I'm hanging up.

Reference numeral 14 denotes a locking device for the skirt-side seal hardware, which locks the pressure by inserting the tapered pin 14a at the tip into the tapered groove 13a of the expansion joint mounting hardware 13 when the skirt-side seal hardware is pressed. Reference numeral 15 denotes an elevating bracket, on which the mooring mechanism 11, a skirt-side seal hardware pressing cylinder 12, and a skirt-side seal hardware lock device 14 are installed, and 16 is a plurality of these elevating cylinders. Reference numeral 17 denotes a hood support arm, and reference numeral 18 denotes an expansion joint that follows the stroke of the elevating cylinder 16 and can withstand the furnace pressure.

A sliding portion 7b between the hood 7 and the expansion joint mounting hardware 13 is provided with a dust seal (not shown) so that dust enters a space 19 surrounded by the expansion joint 18, the hood 7 and the hood support arm 17. Is preventing
Since no gas seal is provided, the inside of the space 19 has the same pressure as the inside of the furnace. For this reason, the hood support arm between the joint 7a between the hood 7 and the hood support arm 17 and the upper flange 18a of the telescopic tube 18 is airtightly formed outside.

The duct 9 is fixed to a frame 20a of a hood moving carriage 20, and the hood support arm 17 is suspended from the hood moving carriage 20 by a hood suspender 21 so as to be movable upward. The duct 9 and the upper part of the hood 7 are airtightly connected by an expansion joint 22, and a dust seal 23 is provided at a connection portion between them. A dust seal (not shown) is provided between the furnace fitting 3 and the skirt-side seal fitting 10.

The operation of the embodiment constructed as described above will be described below. FIG. 2 is an explanatory view showing a state in which the furnace port and the hood have not yet been hermetically sealed. The swing cylinder 11b, the pressing cylinder 12, and the elevating cylinder 16 are all limited.
In this state, it is possible to run the hood moving carriage 20 or to tilt the furnace.

FIG. 3 is an explanatory view showing a state where the skirt 8 is lowered. The lifting bracket 15 is lowered by the lifting cylinder 16 to the lower limit. At this time, the pressing cylinder is kept at the limit. In this state, the expansion joint mounting hardware 13 descends while sliding the hood 7, and the expansion joint 1
8 is stretched. Next, the mallet pin 11a is swung by the swing cylinder 11b and inserted into the U-shaped groove of the furnace opening flange 2.

FIG. 4 is an explanatory view showing a hermetically sealed state. The pressing cylinder 12 is extended to press the skirt side seal fitting 10 against the furnace mouth seal fitting 4 and the O-ring 5 is crushed.
When the pressure is further pressed, the lifting bracket 15, the mooring mechanism 11 and the like are raised, and the clearance between the furnace port flange 2 and the mallet pin 11a disappears. Further pressing is performed so that a predetermined crushing force is applied to the O-ring 5. At this time, the lifting cylinder 16
For example, in the case of a hydraulic cylinder, the head side is prevented from shrinking by pressing the head side with a necessary pressure. In this state, the hood 7 is integrated with the lifting bracket being lifted.
And the hood support arm 17 also goes up. As a result, the hood suspender 21 is floated from the frame 20 of the hood moving carriage, and the expansion joints 9 and 18 are contracted by the clearance between the furnace port flange 2 and the mallet pin 11a. In this embodiment, the taper pin 14a of the lock device 14 for the skirt side seal metal is inserted into the taper groove 13a and locked in order to perform a more complete seal. In this state, the furnace body and the hood are connected and sealed.

FIG. 1 is a diagram for explaining a case where the furnace internal pressure is increased. The operating state is the same as the state shown in FIG. 4, but the hood 7 receives an upward force due to the gas pressure in the furnace. This force is transmitted to the furnace opening flange 2 via the hood support arm 17, the lifting cylinder 16, the lifting bracket 15, and the mallet pin 11a. Also, the skirt 8 and the skirt-side sealing hardware 10
Is also transmitted to the furnace opening flange via the pressing cylinder 12, the lifting bracket 15 and the mallet pin 11a, and these forces are applied to the hood moving carriage 20 to balance the gas pressure applied to the furnace body. Absent. Thus,
A complete seal between the molten metal furnace and the hood can be achieved, and the pressure in the furnace can be raised to the required height.

[0016]

As can be seen from the above description, according to the hermetic sealing apparatus for a molten metal furnace of the present invention, the furnace port can be completely sealed and the pressure in the furnace can be raised to a sufficient height. Therefore, it is not only sufficiently applicable to the pressurizing operation of a molten metal furnace such as a pressurized converter or a pressurized smelting reduction furnace, but is also effective as a hermetic sealing device for a reduced-pressure molten metal furnace.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a hermetic sealing device for a molten metal furnace according to the present invention, and shows a hermetically sealed state when the inside of the furnace is pressurized.

FIG. 2 is an operation state diagram before a hermetic seal.

FIG. 3 is an explanatory view of the operation when the skirt is lowered.

FIG. 4 is an operation state diagram showing a hermetically sealed state.

FIG. 5 is a sectional view of a conventional method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molten metal furnace 2 Furnace mouth flange 4 Furnace mouth seal metal 5 O-ring 7 Hood 8 Skirt 10 Skirt side seal metal 11 Mooring mechanism 12 Seal metal lifting mechanism 12a Pressing cylinder 16 Elevating cylinder 17 Hood support arm 18 Expansion joint 20 Hood moving carriage 20a Frame 21 Hood Hanging Tool 24 Skirt Flange 25 Screw 26 Sliding Part 27 Packing 28 Packing 29 Sliding Part Flange

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yukito Io 46-59 Ohara Nakahara, Tobata-ku, Kitakyushu-shi, Fukuoka Nippon Steel Corporation Machinery & Plant Business Department (56) References JP-A 1-252591 (JP) JP-A-3-134489 (JP, A) JP-A-3-138311 (JP, A) JP-A-3-140407 (JP, A) JP-A-1-172606 (JP, A) (58) Surveyed field (Int. Cl. ⁶ , DB name) C21C 5/40 F27D 17/00 105

Claims (1)

(57) [Claims] 1. A furnace opening of a molten metal furnace and a furnace of the molten metal furnace.
The gap with the hood connected to the exhaust gas duct
In the hermetic sealing apparatus for a molten metal furnace for sealing,
A skirt at the lower part of the hood, and the skirt and the hood
An expansion joint is interposed between the skirt and the skirt.
Seal the skirt side seal metal through seal packing.
Attach the freely removable furnace mouth seal metal to the molten metal furnace side
A lift that is raised and lowered by a lifting device above the furnace port seal hardware
Attach the lowering bracket, and attach the seal
The skirt-side seal metal through an object pressing mechanism;
A detachable mooring mechanism is suspended from the furnace mouth seal hardware, and
Raising and lowering the lowering bracket and pressing the sealing hardware
Press the skirt side seal hardware against the furnace mouth seal hardware
And hermetically sealed between the two seals.
Hermetic sealing device for molten metal furnace.