JPH0444610Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention relates to a gas sealing device for a drive device that rotates a distribution chute arranged at the top of a blast furnace.

``Prior art'' In a blast furnace, a furnace top charging device is used to charge materials such as ore and coke into the furnace.
A bell-less furnace top charging device is known.

This bell-less type furnace top charging device uses two stages of seal valves to seal the gas, and continuously rotates the distribution chute installed in the furnace to distribute and charge the material.The overall structure is compact and high. It has the advantage of being able to make the temperature relatively low, and has recently begun to be widely adopted.

FIGS. 4 to 6 show an example of a conventional water-cooled bell-less furnace top charging device.

Reference numeral 1 in FIG. 4 denotes a casing disposed at the top of the blast furnace, and the casing 1 consists of a conical shell 1a and a cover 1b and a flange 1c provided above and below, respectively. A distribution chute 2 is provided at the center of the conical shell 1a for distributing and charging materials such as ore or coke into the furnace from an upper opening. The distribution chute 2 is rotated around the furnace center line 1 by a drive device 3 provided in the conical shell 1a, and its inclination angle can be changed as desired.

The drive device 3 will be explained with reference to FIG. 5. Inside the casing 1 is a rotary table 5.
is arranged rotatably about the center line l. This rotary table 5 is connected to the distribution chute 2.
It supports an upper upright part 6, a horizontal part 7, a lower upright part 8, and a flange part 9 attached to the lower end of the lower upright part 8.

The upper upright portion 6 has a cross section L on the outer periphery of the cylindrical member 10.
It is formed by fixing a letter-shaped member 11 and has a ring groove 12 with an open top. Projections 10a and 11a are formed on the upper portions of the cylindrical member 10 and the member 11 having an L-shaped cross section, respectively, and these projections are loosely fitted into ring grooves provided in the casing cover 1b. A mounting hardware 13 is attached to the outer periphery of the member 11 having an L-shaped cross section, and a bearing 14 is provided between the mounting hardware 13 and the casing cover 1b. This bearing 1
A rotary table 5 is rotatably supported by 4. The bearing 14 consists of an outer ring 14a fixed to the mounting hardware 13, an inner ring 14b fixed to the casing cover 1b, and a ball 14c interposed between the two rings. A toothed portion 14d is formed on the outer periphery of the outer ring 14a, and the output of the driving force transmission system 15 arranged in the space S formed between the casing 1 and the rotary table 5 is transmitted to the rotary table 5 via the toothed portion 14d. The table 5 and the distribution chute 2 are rotated by the transmission.

Further, the drive device 3 is provided with a water-cooled cooling device. That is, a ring-shaped hollow part 16 is provided on the lower surface of the casing cover 1b so that the rotary table 5
Water is supplied to this hollow portion 16 from a plurality of water supply nozzles 17 provided along the circumferential direction of the casing cover 1b. The water supplied to the hollow part 16 is
The liquid is supplied to the ring groove 12 of the rotary table 5 through a communication nozzle 18 extending from the ring groove 6, and from there to the lower cooling panels 20a, 20b via a pipe 19 penetrating the bottom of the ring groove.

The cooling panels 20a and 20b are connected to the rotary table 5.
The cooling pipes are attached to the upper surface of the horizontal part 7 and the outer circumferential surface of the lower upright part 8, respectively.For example, cooling pipes are arranged in a serpentine shape in a frame made of an iron plate, and the cooling pipes and the frame are attached to each other. A structure in which an amorphous refractory with excellent thermal conductivity is filled in between is used.

On the other hand, inside the lower flange 1c of the casing 1, a trough 21 having a U-shaped cross section is provided continuously in the circumferential direction in a ring shape, located below the horizontal portion 7 of the rotary table 5. . The water flowing inside the cooling panels 20a and 20b is guided into the trough 21 via piping 22 which is provided at appropriate intervals in the circumferential direction and penetrates the cover body 28, which will be described later. It is discharged to the outside through a discharge pipe 23 extending from the lower part of the side wall and penetrating the mantel 32.

The upper part of the trough 21 is covered by a cover 24 extending from the rotary table 5.
The grease used in the power transmission system 15 above does not get into the inside of the power transmission system 15. As shown in FIG. 6, the cover 24 includes a mounting ring 25 fixed to the flange portion 9 of the rotary table 5, stands 26 extending upward from the mounting ring 25 and arranged at predetermined intervals in the circumferential direction, and the stands 26. A conical cover body 28 attached via an arm 27 to
, a guide plate 29 having a U-shaped cross section welded to the lower end of the cover body 28, and a guide plate 29 from which the trough 21
It consists of an agitation plate 30 that extends inside the trough and prevents dust from accumulating at the bottom of the trough. Moreover, this cover 24 is divided into a plurality of parts in the circumferential direction. Note that 31a, 31b, 31c, and 31d are heat insulating materials pasted on the inside of the rotary table 5, and 33 is a baffle plate extending downward from the casing cover 1b to be located inside the rotary table 5. .

Incidentally, in such a bellless furnace top charging device, a power transmission system 15 for rotating the distribution chute 2 connects the casing 1 and the rotary table 5.
is arranged in a space S between the power transmission system 1 and
5. It is necessary to take sufficient care to avoid the influence of the furnace gas, which is high in temperature and contains a large amount of dust.

In the conventional bell-less type furnace top charging device shown in Figs. 4 to 6, the following measures are taken to prevent the gas in the furnace from flowing into the space S.

That is, a seal plate 34 is sandwiched between the flange portion 9 of the rotary table 5 and the mounting ring 25 of the cover, and the outer circumferential end of the seal plate 34 is attached to the inner circumferential side wall of the trough 21 at an appropriate distance from each other. Ring-shaped protrusions 35, 35 provided
It is loosely fitted in between.

In other words, the path from the furnace space to the space S where the power transmission system 15 is arranged is bent, thereby making it difficult for the gas inside the furnace to flow into the space S.

``Problems that the invention attempts to solve'' However, the gas seal device described above only increases the gas flow resistance by bending the path, and although it is sufficiently effective in small blast furnaces, For example, in the case of a large blast furnace with an internal volume exceeding 4000 ^m3 , the gas turbulence in the furnace space is much greater than in a small blast furnace. High temperature gas tends to continue to enter the space S through the seal portion. As a result, the atmospheric temperature in the space S may reach 100°C or higher, and the amount of dust contained in the gas is much greater than in the case of a small blast furnace, so there is a risk of damage to the machine. There are not enough countermeasures.

In addition, with the above-mentioned conventional gas seal device, when a high temperature load is applied to the top of the furnace, such as when the blast furnace slips and causes a blow-through,
There is a risk that the rotary table 5 will undergo thermal expansion and the seal plate 34 will come into contact with the inner side wall of the trough 21, making it impossible to rotate, ie, making it impossible to charge the raw material.

This invention attempts to eliminate these conventional drawbacks.

``Means for solving the problem'' In this invention, a rotary table is installed in the casing at the top of the blast furnace so that it can rotate freely in the horizontal direction, and by rotating the rotary table, the distribution chute attached to the rotary table can be rotated. A gas sealing device between an inner periphery of a casing and an outer periphery of a rotary table in a blast furnace top distribution chute drive device, wherein either of the inner periphery of the casing and the outer periphery of the rotary table, which face each other, A ring-shaped trough having an opening at the top extends from one side over the entire circumference, and a cover body covering the upper opening of the trough extends over the entire circumference from the other side, and a cover body extends downward from the cover body. providing a ring-shaped partition plate extending to a ring-shaped partition plate whose lower end reaches near the bottom of the trough, and providing a trough water level control means for controlling the water level in the trough to be above the lower end of the partition plate inserted therein; The partition plate is characterized in that a plurality of through portions are provided in the circumferential direction at positions that are submerged below the trough water surface of the partition plate.

"Operation" By inserting the partition plate extending from the cover body into the trough so that it is below the water level, a water seal can be created between the outer circumference of the rotary table and the inner circumference of the furnace top casing. Therefore, as long as this water seal is not broken, the furnace gas will not enter the space formed between the outer circumference of the rotary table and the inner circumference of the casing through that part, and a reliable seal will be maintained. can be realized.

In addition, since the penetration part is provided in the partition plate at a position that is normally submerged under the trough water surface, when there is a fluctuation in the furnace top pressure and the trough water level falls, the furnace gas gradually flows through the penetration part into the casing. This can prevent a large amount of gas from suddenly flowing in and out of the inner space.

"Embodiment" An embodiment of this invention will be described below with reference to FIGS. 1 to 3. Note that the same components as those explained in the conventional example are given the same reference numerals, and the explanation thereof will be omitted.

In this example, the rotary table 5 is rotatably supported by a bearing 14, and the distribution chute is rotated by rotationally driving the rotary table 5 by a power transmission system 15. 31d, while cooling panels 20a and 20b are arranged on the inner circumferential side of the casing,
The cooling panels 20a, 2 are supplied with water through the water supply nozzle 17 into the ring groove 12 on the upper part of the rotary table 5.
The structure in which the rotary table 5 and the space S outside the rotary table 5 are cooled through 0b, received by the trough 21 after cooling, and discharged to the outside is the same as that of the conventional example shown in FIGS. 4 to 6. The characteristic part of this example is that the seal plate 34 of the conventional example is abolished,
Instead, a special cover 40 is used and a water level adjusting means 50 is provided to keep the water level in the trough 21 constant.

Regarding the cover 40, a ring-shaped mounting bracket 41 is attached to the flange portion 9 at the lower part of the outer periphery of the rotary table 5 by fixing means such as bolts (see FIG. 2). The mounting bracket 41 is provided so that its outer periphery extends above the inner peripheral side wall 21a of the trough 21, and its tip is bent downward and positioned within the trough. A conical cover body 42 that covers the upper opening 21b of the trough 21 is welded to the upper part of the outer peripheral end of the mounting bracket 41 so that the enlarged diameter side faces upward. A ring-shaped partition plate 43 is provided extending from the center of the lower part of the cover body 42 to the vicinity of the bottom of the trough so that its tip is below the water level of the trough 21. Partition plate 43 of cover body 42
Piping 22 extending from the cooling panels 20a, 20b is provided in a penetrating state further to the outer peripheral side than the portion where the cooling panels 20a, 20b are attached, so that water flows into the trough 21 after passing through the cooling panels 20a, 20b.

The mounting fittings 41, the cover body 42, and the partition plate 43 are divided into a plurality of parts in the circumferential direction, and these parts are spaced at appropriate intervals (for example, about 2 to 3 mm, this value depends on the outer diameter, thickness, and number of divisions of the cover 40. (depending on the location) and the gaps are filled with filler such as paste.
The purpose of this arrangement is to absorb thermal expansion of the cover 40. A one-piece ring-shaped seal packing 44 is fixed to the upper part of the cover body 42 and the mounting bracket 41 by a stop plate 45 at the upper part.

Two inverted V-shaped notches 4, large and small, extend from the lower end of the partition plate 43 at a position submerged below the trough water surface.
6 and 47 are alternately provided at appropriate intervals in a plurality of circumferential directions (see FIG. 3). In the figure, L indicates the water level during normal operation of the trough, and the upper end of the notch 46 should be at a level a dimension a lower than this water level, and the upper end of the notch 47 should be at a level of a dimension b (b>a). , these notches 46 and 47 are made. In the illustrated example, inverted V-shaped notches 46 and 47 are formed in the partition plate 43, but the shape is not limited to the V-shape and may also be a hole. In short, it is sufficient as long as it passes through the lower part of the partition plate 43.

On the other hand, to explain the trough water level control means 50, a pipe 51 extends outward from the outer side wall 21c of the trough and is provided to penetrate the mantel 32, and a water level control tank 53 is connected to the tip thereof. The lower part of the control tank 53 is partitioned into two chambers by a partition plate 54 that extends upward from the bottom to a predetermined height, and one of the chambers 53a is connected to the pipe 51.
The other chamber 53b is connected to a drain pipe 55 leading to the outside. Water flowing from the trough 21 side via the pipe 51 flows into the chamber 53a, passes over the upper end of the partition plate 54, reaches the chamber 53b, and is discharged from there to the outside through the drain pipe 55. The water level in the trough 21 can be determined by adjusting the height h of the partition plate 54. It is set to be below the upper end of 21a.

Further, the inside of the tank 53 is communicated with the space S via a communication pipe 57 whose one end passes through the lid 56 and whose other end passes through the casing 1. The tank 53 is connected to the space S in this way.
This is to prevent the water level in the trough 21 from being unable to be maintained at a desired level when the pressure inside the trough 3 and the space S changes. Note that 58 indicates a seal portion of the pipe penetration portion.

Therefore, with the above gas seal device, the space S in which the power transmission system 15 is housed with respect to the furnace interior space is
is a trough 21 whose lower part extends from the casing 1;
A cover 40 extending from the rotary table 5 to the trough 21 side, a seat packing 44, a partition plate 43 whose lower end is submerged under the water surface of the trough to make it airtight, and a baffle plate whose upper end extends from the casing cover 1b. 33. The rotary table is held relatively airtight by the protrusions 10a, 11a on the upper part of the rotary table and the bearing 14 which are loosely fitted into the ring groove on the lower surface of the casing cover 1b, so that it is extremely difficult for the furnace gas to enter the space S. It's summery. Therefore, the power transmission system 15 housed in the space S can be protected from the heat of the furnace gas and dust.

Additionally, the top pressure of the furnace fluctuates before and after feeding the raw materials, and it fluctuates especially greatly when slip occurs. Due to such fluctuations in the furnace top pressure, the partition plate 43 of the trough 21
The water levels L ₁ and L ₂ on the left and right sides separated by . For example, when the furnace top pressure increases, the water level L ₁
is lowered, and at the point when the distance a has been lowered, the gas in the furnace flows through the upper end of the notch 46 to the space S side, and the pressure difference between the inside of the furnace and the space S is alleviated. If the rise in the furnace top pressure is greater than this relaxation rate, the water level L ₁ will further fall, and when it has fallen by a distance b or more, the gas in the furnace will pass through not only the notch 46 but also the notch 47 to the space S side. flows to In this way, as the furnace top pressure increases,
The gas flowing in and out of the space S from the inside of the furnace can be gradually increased, and the pressures in both spaces can be quickly equalized. It is more preferable if the notches 46 and 47 of the partition plate 43 are formed in an inverted V shape as shown in the illustrated example, since the amount of gas passing through the notches can be increased exponentially as the water level decreases. As described above, the pressure between the inside of the furnace and the space S is relaxed, and the levels L ₁ and L ₂ return to L when the pressures on both sides become equal. Conversely, when the furnace top pressure decreases, the water level _L2 decreases and the gas in the space S flows into the furnace.

It should be noted that the water level control means 50 shown in the above embodiment is just an example, and other means such as interposing an on-off valve in the piping and providing a sensor for detecting the trough water level, and controlling the water level based on the output signal from the sensor. A structure that maintains the trough water level constant by controlling an on-off valve may also be used. However, it is not preferable to move the connection port of the pipe 51 extending from the trough 21 upward in accordance with the water level because it becomes difficult to discharge dust and the like that accumulate at the bottom of the trough.

Further, in the above embodiment, the trough 21 is provided on the casing 1 side, and the cover body 42 and the partition plate 43 are provided on the rotary table 5 side, but conversely,
The cover body 42 and the partition plate 43 may be provided on the casing 1 side, and the trough 21 may be provided on the rotary table 5 side.

Further, in the above embodiment, an example in which this invention is applied to a water-cooled furnace top charging device is explained, but this invention is not limited to a water-cooled type, but can also be applied to an air-cooled type. However, in the case of an air-cooled type, it is necessary to newly install a trough. Compared to this, when applied to a water-cooled type, most of the existing parts such as the trough and cover can be used, which has the advantage of being able to be installed at low cost.

"Effects of the invention" As explained above, this invention provides the following excellent effects.

A trough is provided between the inner periphery of the casing and the outer periphery of the rotary table so as to extend all the way from one of them, and the cover body covers the upper opening of the trough so as to extend all the way from the other side. By providing a partition plate that extends downward from the cover body and whose lower end is submerged under the water surface of the trough, the lower part of the space that accommodates the power transmission system 15 formed between the casing and the rotary table can be closed. The furnace can be kept airtight between the furnace chambers, thereby preventing furnace gases from entering the space formed between the casing and the rotary table. As a result, even in a large-sized blast furnace, the power transmission system housed in the casing can be protected from the heat of the furnace gas and dust, and the durability and maintainability of the power transmission system can be improved.

In addition, since a penetration part is provided at the bottom of the partition plate, even if the furnace top pressure fluctuates, the trough water level will drop and the gas in the furnace will gradually flow into and out of the space between the casing and the rotary table. ,
It is possible to prevent an accident in which a large amount of gas in the furnace suddenly flows into the space formed between the casing and the rotary table, causing water in the trough to scatter into the furnace. Furthermore, even if the gas in the furnace breaks the water seal between the trough and the partition plate and flows into the casing internal space S, the gas is cooled while passing through the water in the trough, and the dust contained therein is removed. Therefore, the influence of the gas on the parts of the swing drive device is extremely small.

Furthermore, since the seal ring shown in the conventional example is not used, even if the rotary table thermally expands during high-temperature loads caused by slips, etc.
Parts attached to the rotary table do not come into contact with parts on the casing side, and inconveniences such as inability to rotate can be prevented.

[Brief explanation of the drawing]

Figures 1 to 3 show one embodiment of this invention, with Figure 1 being a half-sectional view of the upper part of the blast furnace, Figure 2 being a perspective view of part of the cover, and Figure 3 being part of the partition plate. The perspective view and FIGS. 4 to 6 show a conventional example, FIG. 4 is a sectional view of the upper part of the blast furnace, FIG. 5 is a half sectional view explaining the distribution chute drive device, and FIG. 6 is a part of the cover. FIG. 1...Casing, 2...Distribution chute, 3...
... Drive device, 5 ... Rotary table, 12 ... Ring groove, 14 ... Bearing, 15 ... Power transmission system, 20
a, 20b...Cooling panel, 21...Trough, 3
2... Mantel, 40... Cover, 41... Mounting bracket, 42... Cover body, 43... Partition plate, 4
4... Seat packing, 46, 47... Notch (penetrating part), 50... Trough water level control means, 53...
Water level control tank, 54... Partition plate, 55
...Drain pipe, 57...Communication pipe.

Claims (1)

[Scope of utility model registration request] The inner periphery of the casing in a top distribution chute drive device for a blast furnace, in which a rotary table is horizontally rotatable in the casing at the top of the blast furnace, and by rotating the rotary table, the distribution chute attached to the rotary table is rotated. A gas sealing device between the casing inner periphery and the outer periphery of the rotary table, the inner periphery of the casing facing each other and the outer periphery of the rotary table having an opening extending upwardly from either one of them to the entire periphery. A ring-shaped trough is provided, and a cover body is provided to cover the upper opening of the trough so as to extend from the remaining other side over the entire circumference, and the ring-shaped trough extends downward from the cover body and has a lower end reaching near the bottom of the trough. A partition plate is provided, and a trough water level control means is provided for controlling the water level in the trough to be above the lower end of the ring-shaped partition plate inserted therein, and a trough water level control means is provided at a position where the partition plate is submerged below the trough water surface. A gas sealing device for a driving device for a top distribution chute of a blast furnace, characterized in that a plurality of penetration parts are provided in the circumferential direction.