JP3364245B2 - Dust collector around taphole of blast furnace - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tap dust collecting apparatus for a blast furnace.

[0002]

2. Description of the Related Art The taphole of a blast furnace is formed by opening a taphole provided in the furnace body with a hole punching machine, pouring the hot metal into a taphole gutter extending in front of the taphole, and tapping the taphole. After the slag is placed in the gutter to separate the slag, the hot metal is poured into the hot metal gutter and the slag is poured into the hot metal gutter. When pouring the hot metal into the taphole from the taphole, there is a lot of dust generated near the taphole, so multiple gutter covers are installed in the longitudinal direction of the top surface of the tappipe. A dust collection duct is connected to a part of the cover.

Among the plurality of gutter covers for covering the tappipe, the gutter cover closest to the taphole also serves to prevent splash scattering at tapping. The gutter cover that is also used to prevent splashing of splashes is arranged with a certain gap from the taphole so that the tapping situation during tapping can be visually observed, and dust from that gap is located near the taphole. It is designed to collect dust using the suction duct placed at.

In the vicinity of the taphole, there are arranged a gutter cover hanging device for lifting the gutter cover of the taphole, an opening machine for opening the taphole, and a mud gun for closing the taphole. Since these operating ranges are relatively wide, only the suction duct is arranged at a relatively distant position in the vicinity of the taphole in a state where the suction duct is open to the atmosphere so as not to hinder the action of each device.

When the tap hole is opened by a hole punching machine and when it is closed by a mud gun, the hole punching machine and the mud gun interfere with a spout cover for preventing splashing of splash, which is the closest to the tap hole. It is necessary to evacuate it, and when the tap hole is opened or closed, the gutter cover is evacuated, so the space in front of the tap opening is wide open. It cannot be completely dusted, and a canopy hood is installed in the building to collect dust, but it is difficult to sufficiently collect dust around the taphole because the canopy hood is located at a considerable distance.

Various improvements have been made in the past in order to improve the sealing performance of the dust collector installed around the taphole.
For example, in Japanese Patent Laid-Open No. 62-44515, a movable shield curtain is installed near the taphole in order to collect dust by sucking dust near the taphole of the blast furnace. It is disclosed that the suction duct is moved to a position forming a flow passage in which an atmosphere near the taphole is formed, and the shield curtain is moved to a position retracted from the flow passage during the opening work.

Further, in Japanese Patent Laid-Open No. 2-57627, there is a local dust collection in front of the tap hole, a blocking air flow formed in front of the local dust collecting portion, and a discharge flow between the tap hole and the blocking air flow. Disclosed is a method of collecting dust by a combination of either or both of countercurrent airflows formed so as to substantially oppose the dust-containing airflow from the pig iron and blast furnace building dust collection.

[0008]

However, among the conventional techniques disclosed in the above-mentioned publications, the former needs to retract the shielding curtain during the opening work, so that the dust generated during the opening work is sufficiently collected. There is a problem that not only dust cannot be generated but also the amount of electric power used increases as the amount of collected air increases. Also, the latter can save electricity for dust collection, and the local dust collecting part above the tap hole is blocked by the blocking airflow formed in front of it, but the side surface is open below the local dust collecting part. There is a problem that dust collection becomes insufficient.

An object of the present invention is to improve the dust collection efficiency around the taphole and to enable sufficient dust collection while reducing the amount of dust collection air.

[0010]

The present invention according to claim 1 is a dust collector for a taphole of a blast furnace, wherein a front wall of the furnace body and a taphole are provided around the taphole of the furnace body. A front wall of the furnace body that forms a dust collection area that is shielded by the side walls and a work floor that horizontally extends from the upper part of the front wall of the furnace body except the front of the tap hole, and forms the dust collection area. A dust collection hood provided with a downward concave top plate extending horizontally in the upper part is provided, and both ends of the hood are shielded, and an air blowing device is provided in front of the hood, and air is blown from the air blowing device. A swirling airflow is formed below the top plate of the hood by the wake action of an air curtain formed by air, and an air suction device is provided on one or both end shields of the hood located in the axial direction of the swirling airflow. , The air blowing device and the air suction The simultaneous operation of the device is obtained so as to generate artificial tornado in the hood.

According to a second aspect of the present invention, in addition to the first aspect of the present invention, the air blowing device is capable of adjusting an air blowing amount and an air blowing angle, and the air suction device controls an air sucking amount. It is designed to be adjustable.

[0012]

According to the present invention, the following effects are obtained. The front wall of the furnace body, the tapping floor, both side shielding walls, and the working floor formed a dust collecting area which was shielded except in front of the tapping port. Then, an air blowing device and an air suction device were provided in the hood provided in the dust collecting area, and an artificial tornado was generated in the hood by both of these devices. Therefore, the dust generated in the dust-generating area around the taphole should be kept in the dust-collecting area even during the opening work with the punching machine or the closing work with the mud gun in front of the dust-collecting area. As a result of the vortex convergence of the artificial tornado, it is reliably sucked and collected, and the dust around the taphole can be efficiently collected.

Depending on the operation of the blast furnace, the air blowing amount and the air blowing angle of the air blowing device are adjusted, or the air sucking amount of the air sucking device is adjusted to always form an appropriate artificial tornado in the hood. The dust collection efficiency can be reliably improved.

As a result of the above, it is possible to improve the dust collection efficiency around the taphole and to enable sufficient dust collection while reducing the amount of dust collection air. This improves the working environment,
Blast furnace construction costs and operating costs (electricity costs) can be reduced.

[0015]

EXAMPLE FIG. 1 is a plan view showing a structure around a taphole of a blast furnace,
2 is a side view of FIG. 1, FIG. 3 is a schematic view showing a taphole surrounding dust collector, FIG. 4 is a perspective view showing a taphole around dust collector, and FIG.
FIG. 3 is a schematic diagram showing a blast furnace cast floor layout.

The tapping from the blast furnace 10 is as shown in FIG.
The tap hole 12 provided in the furnace body 11 is opened by a punching machine 13, and the hot metal is poured into the tap hole 14 extending in front of the tap hole 12, and the tap hole 14 is placed in the tap hole 14. After the molten metal is separated by the skinma 15, the molten metal is poured into the molten metal gutter 16 and the molten metal is poured into the molten metal gutter 17. The hot metal poured into the hot metal gutter 16 is driven by a silicon removal driving device 18 and a desiliconizing agent is injected into the hot metal ladle 16. Then, the left and right hot metal ladles (tope car) 20 are continuously received by the tilting gutters 19. In addition, the molten sludge poured into the molten sludge 17 is
By 1, the left and right slag ladles 22 are continuously received. After tapping, the tapping port 12 is closed by the mud gun 23.

However, this embodiment relates to dust collection around the taphole 12 (see FIGS. 1 to 5). That is, as shown in FIGS. 1 and 2, since a large amount of dust is generated during tapping, gutter covers 24 and 25 are detachably installed in the tapping gutter 14 and a dust collecting duct is provided in a part of the gutter cover 25. (Not shown) is connected.

The gutter cover 24 on the side closest to the taphole 12 also serves to prevent splashing of splash from the taphole 12, and the gutter cover 24 allows visual observation of the tapped state from the taphole 12. In order to do so, a predetermined gap is arranged with respect to the tap hole 12, and the gap serves as a dust generation area around the tap hole 12. Further, when the tap hole 12 is opened by the boring machine 13 and closed by the mud gun 23, in order to prevent the boring machine 13 and the mud gun 23 from interfering with the gutter cover 24, the blast furnace strut 26 is provided. The gutter cover 24 is retracted by the supported gutter cover suspension device 27.
Therefore, the space between the gutter cover 25 and the tap hole 12 increases,
The dust generation area around the tap hole 12 is enlarged.
Incidentally, 28 is a canopy hood.

At this time, in this embodiment, the front wall 31 of the furnace body 11 and the tapping floor 32 are provided around the tap hole 12 of the furnace body 11.
And both side shield walls 33A and 33B and the front wall 3 of the furnace body 11.
1. A work floor 34 that horizontally extends from the upper part forms a shielded dust collecting area 35 except for the front of the tap hole 12 (to secure a work space for the hole punching machine 13 and the mud gun 23). As a result, dust generated in the dust generating area around the tap hole 12 is retracted by the gutter cover suspension device 27 while the gutter cover 24 is retracted by the gutter cover suspending device 27 during the opening work by the opening machine 13 and the closing work by the mud gun 23. Even when a space having a large gap between the cover 25 and the tap hole 12 is generated, the dust is kept in the dust collecting region 35 and is prevented from leaking to the outside.

Further, a dust collecting hood 36 is installed in the dust collecting area 35, in the immediate vicinity of the tap hole 12. As shown in FIGS. 3 and 4, the dust collecting hood 36 includes the front wall 31 of the furnace body 11.
A back plate 36A which is erected along with, and which extends in the horizontal direction at the upper part of the front wall 31 connected to the upper part of the back plate 36A,
Semi-circular top plate 36B that forms a downward concave surface, and back plate 36A
And both side shield plates 36C and 3C for shielding both ends of the top plate 36B.
6D and.

An air blowing device 37 is provided on the lower surface of the work floor 34 in front of the dust collecting hood 36. The air blowing device 37 is provided with the dust collecting hood 3.
Air blow-out pipe 39 arranged in parallel along the width direction of 6
A plurality of air blowing nozzles 39A are provided in the axial direction. The air blowing device 37 blows air from the nozzle 39A of the air blowing pipe 39 to the front surface of the dust collecting hood 36, and by the wake action of the air curtain a formed by the blown air, the top plate 36B of the hood 36 is blown.
A swirling air flow b is formed below. In addition, 40 is an air supply fan.

Further, on both side shield plates 36C and 36D of the dust collecting hood 36 located in the axial direction of the swirling air flow b,
An air suction device 41 is provided. Air suction device 41
Is the suction ports 42A, 43A of the air suction ducts 42, 43
Is projected inside the shielding plates 36C and 36D.
Incidentally, 44 is an exhaust fan.

As a result, in this embodiment, the artificial tornado c is generated in the hood 36 by the simultaneous operation of the air blowing device 37 and the air suction device 41, and the dust in the dust collecting area 35 is swirled by the artificial tornado. Due to the converging property, it is reliably sucked and collected.

The principle of the generation of this artificial tornado is that the swirling airflow b is formed by the air blown from the air blowing device 37, and the central portion of the swirling airflow b is sucked by the air suction device 41, and the swirling airflow b is guided along the center of the swirling airflow b. It is made by forming a negative pressure area (core), and by the synthetic action of these,
The suction port 4 while converging the swirl of the swirling air flow b to the central core
It generates a continuous artificial tornado heading for 2A and 43A.

The air blowing device 37 uses an air flow rate adjusting valve 39B or the like provided in the air supply path to the air blowing pipe 39 to adjust the amount of dust generated in the dust collecting area 35 and the dust generating range. The amount of air blown out from the nozzle 39A can be adjusted, and together with the assistance of the semicircular top plate 36B of the hood 36, an appropriate artificial tornado can be formed in the hood 36. The air flow rate adjusting valve 39B is automatically controlled or manually controlled according to the output of a dust meter provided in the dust collecting area 35.

Further, the air blowing device 37 adjusts the air blowing angle from the nozzle 39A by the turning device 39C of the air blowing pipe 39 according to the amount of dust generated in the dust collecting area 35, the dust generating range and the like. It is possible to form an appropriate artificial tornado c in the dust collecting hood 36. Rotating device 39
C is automatically controlled or manually controlled according to the output of a dust meter provided in the dust collecting area 35.

Further, the air suction device 41 uses the air flow rate adjusting valves 42B, 43B and the like provided in the exhaust paths to the air suction ducts 42, 43, etc., to generate the dust generation amount, the dust generation range, etc. in the dust collecting area 35. Accordingly, the amount of air sucked into the suction ports 42A and 43A can be adjusted, and an appropriate artificial tornado c can be formed in the dust collecting hood 36. Air flow control valve 42
B and 43B are automatically controlled or manually controlled according to the output of a dust meter provided in the dust collecting area 35.

The operation of this embodiment will be described below. The front wall 31 of the furnace body 11, the tapping floor 32, the shield walls 33A and 33B on both sides, and the working floor 34 form a dust collecting area 35 which is shielded except in front of the tapping port 12. Then, an air blowing device 37 and an air suction device 41 are provided in a hood 36 provided in the dust collecting area 35, and an artificial tornado is generated in the hood 36 by both of these devices 37, 41. Therefore, even when the front surface of the dust collecting area 35 is being opened by the hole punching machine 13 or being closed by the mud gun 23, the dust generated in the dust generating area around the taphole 12 is located in the dust collecting area 35. In the stopped state, the vortex converging property of the artificial tornado ensures the suction and collection, and the dust around the taphole 12 can be efficiently collected.

Depending on the operation of the blast furnace 10, the air blowing amount and the air blowing angle of the air blowing device 37 are adjusted, or the air suction amount of the air sucking device 41 is adjusted, so that the hood 36 is always kept in a proper artificial state. A tornado can be formed and the dust collection efficiency can be reliably improved.

By the above, the dust collection efficiency around the tap hole 12 can be improved, and sufficient dust collection can be performed while reducing the dust collection air volume to 1/2 to 1/3 of the conventional one. This will improve the working environment, blast furnace construction costs, operating costs (electricity costs)
Can be realized.

[0031]

As described above, according to the present invention, it is possible to improve the dust collecting efficiency around the taphole and to sufficiently collect dust while reducing the amount of dust collecting air.

[Brief description of drawings]

FIG. 1 is a plan view showing a structure around a taphole of a blast furnace.

FIG. 2 is a side view of FIG.

FIG. 3 is a schematic view showing a dust collector around a taphole.

FIG. 4 is a perspective view showing a dust collector around a taphole.

FIG. 5 is a schematic diagram showing a blast furnace casting floor layout.

[Explanation of symbols]

10 blast furnace 11 furnace body 12 Outlet 31 front wall 32 pig iron floor 33A, 33B Shielding walls on both sides 34 Working floor 35 Dust collection area 36 Dust collecting hood 37 Air blowing device 41 Air suction device

Front page continued (58) Fields surveyed (Int.Cl. ⁷ , DB name) C21B 7/22 301 F24F 7/06 101 F27B 1/18

Claims (2)

(57) [Claims] 1. A dust collector for a taphole of a blast furnace, in which the front wall of the furnace body, the taphole, both side shield walls, and the upper part of the front wall of the furnace body are horizontally arranged around the taphole of the furnace body. The projecting work floor forms a dust collecting area that is shielded except in front of the tap hole, and a downwardly-facing concave top plate that extends horizontally in the upper part of the front wall of the furnace body that forms the dust collecting area. The hood is provided with a dust collecting hood that is provided with, and shields both ends of the hood, and is provided with an air blowing device in front of the hood, and the hood is formed by the wake action of an air curtain formed by blowing air from the air blowing device. A swirling airflow is formed below the top plate of the above, and an air suction device is provided on one or both of the both-end shielding portions of the hood located in the axial direction of the swirling airflow. Person in the hood Taphole around dust collecting apparatus for a blast furnace, characterized in that to generate the tornado. 2. The blast furnace taphole collection according to claim 1, wherein the air blowing device is capable of adjusting an air blowing amount and an air blowing angle, and the air suction device is capable of adjusting an air sucking amount. Dust equipment.