JPH06330122A - Dust collecting device around dropping part of molten iron and slag in blast furnace - Google Patents

Abstract

PURPOSE:To remarkably improve the dust collecting efficiency around the dropping part of molten iron and slag, to enable the sufficient dust collection while reducing dust collecting air quantity and in this result, to improve the production efficiency. CONSTITUTION:In the dust collecting device around the dropping part of the molten iron and slag in a blast furnace, an artificial whirlwind along the horizontal direction is generated with a blowing head 40 arranged in the horizontal direction at the upper part of a tilting runner 19 around a first dropping part A of the molten iron and slag. Further, an artificial whirlwind (c) along the perpendicular direction is generated with a blowing head 50 stood in the perpendicular direction around a second dropping part B (C) of the molten iron and slag.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust collector around a hot metal / molten slag outlet of a blast furnace.

[0002]

2. Description of the Related Art Iron tapped from a blast furnace is melted into tap iron gutter from a tap hole of a furnace body, and after the pig iron is separated with a skinma,
(a) The hot metal is made to flow down from the hot metal gutter to the downspout gutter, and then from the downspout gutter to the left and right hot metal ladles (tope-dokers) in a switchable manner to be continuously received, and (b) The molten slag is left out of the sludge gutter. It falls into the tilting gutter, which in turn switches from the tilting gutter to the left and right ladle ladles and is continuously received.

However, the hot metal outlet from the hot metal gutter to the tilting gutter and the hot metal falling part from the tilting gutter to the hot metal ladle of the above (a) are considerable dust generation regions. Further, the above-mentioned (b) slag falling part from the molten sluice to the slant gutter and the slag falling part from the slant gutter to the slag ladle are also considerable dust generation areas.

Therefore, in the prior art, in the hot metal falling portion of the above (a), the hot metal gutter and the tilting gutter are surrounded by a dust collecting hood, and a suction duct connected to the hood prevents dust from generating outside the hood, or In the molten slag drop section of (b) above, the molten slag gutter and the tilting gutter are surrounded by a dust collection hood, and a suction duct connected to this hood prevents dust from being generated outside the hood.

[0005]

However, in the dust collecting hood, there is an opening for monitoring the hot metal ladle / the level of the hot metal / the level of the hot metal ladle, the level of the slant gutter, or the hot metal reserve that has been used in recent years. The desiliconization lance insertion port for processing is opened. Also,
In both the hot metal falling part of (a) and the molten metal falling part of (b), the dust collecting hood cannot surround the hot metal ladle and the passage area of the molten metal ladle, and the dust collecting hood is the receiving part of the hot metal ladle. A constant space G is provided between the pig iron and the slag mouth of the ladle pan. And
In order to avoid interference between the dust collecting hood, the hot metal that adheres to the pig iron port, and the molten metal that adheres to the slag port, the space G is relatively large, and one of the left and right hot metal pots and slag ladle is When full,
The space G becomes even larger when the tilting gutter is switched to the other hot metal ladle and the molten metal ladle, and the full molten metal ladle and the molten metal ladle are replaced with an empty molten metal ladle and a molten metal ladle. For this reason, an increase in the dust collection suction air amount or a shortage of the dust collection suction air amount is likely to occur.

[0006] Conventionally, as a means for reducing the amount of suctioned air for collecting dust, there has been disclosed a technique according to Japanese Utility Model Publication No. 62-11156 and Japanese Utility Model Publication No. 62-23847. These are for reducing the gas volume by cooling the dust-containing gas with the amount of suction air for dust collection to achieve efficient dust collection.The duct connecting the hood that collects the dust-containing gas and the dust collector is used. This is achieved by adopting a cooling method.

However, in the dust collecting hood, the above-mentioned hot metal ladle /
There is an opening for monitoring the hot metal / slag level of the molten metal ladle, for monitoring the slant gutter, or a desiliconizing lance insertion port for pretreatment of the molten metal, and the dust collecting hood and the hot metal ladle or tope car Since the space G between the pig iron port and the slag port of the ladle becomes large as described above, cold air outside the hood is also sucked from these openings and the space G, and the suction air volume of the dust collecting hood. Therefore, even with the means for reducing the gas volume of the dust collecting gas by cooling, there is also a problem of cooling efficiency of the duct, and the dust collection air volume reducing effect is not as large as expected,
A more efficient dust collector has been desired.

Further, if the dust collection efficiency in the dust hood is poor, the visibility of the molten pig iron / molten slag opening is deteriorated due to the dust generation, and the hot metal ladle / metal ladle / receptor level / slag level monitoring, This will make it difficult to monitor the tilt gutter and control the position of inserting the silicon removal lance, and reduce production efficiency.

The present invention significantly improves the dust collection efficiency around the hot metal / molten slag port, enables sufficient dust collection while reducing the amount of dust collection air, and thus improves production efficiency. With the goal.

[0010]

SUMMARY OF THE INVENTION The present invention according to claim 1 is directed to a first hot metal / melt slag drop portion from a hot metal gutter / melt slag trough to a tilting gutter, and a tilting gutter to a hot metal ladle / melt slag. In the dust collector around the hot metal / molten slag mouth part of the blast furnace, in which the second hot metal / molten slag mouth part to the pan is covered by the dust collecting hood, around the first hot metal / molten slag mouth part An air blowing head is arranged in the horizontal direction above the tilting gutter, and a swirling air flow is formed around the outlet by the wake action of an air curtain formed by the air blown from the air blowing head. An air suction port is provided above the axial direction of the air flow, and an artificial tornado along the horizontal direction is generated in the outlet part by the simultaneous operation of the air blowing head and the air suction port, and at the same time, the second molten pig iron / molten slag is removed. An air blowing head is provided upright in the vertical direction around the mouth, and the air blowing head is The swirling airflow is formed around the outlet by the wake action of the air curtain formed by the blowing air, and an air suction port is provided above the swirling airflow in the axial direction. An artificial tornado along the vertical direction is generated at the outlet by the simultaneous operation of the mouths.

According to a second aspect of the present invention, in addition to the first aspect of the present invention, the inner wall surface of the dust collecting hood around each of the first and second molten pig iron / molten slag outlets is provided with a falling wall. It is formed by a part of a cylindrical surface that is substantially coaxial with the central axis of the artificial tornado generated in the mouth portion, and promotes the generation of the artificial tornado.

According to a third aspect of the present invention, in addition to the first aspect of the present invention, an air blowing head provided upright around the second molten pig iron / slag outlet is used as a dust collecting hood. It is arranged adjacent to the air blowing head which is arranged around the first molten pig iron / slag falling portion by bending in the horizontal direction at the connection side, or around the first molten pig iron / slag falling portion. By bending the air blowing head arranged in the vertical direction on the side of the connecting portion with the dust collecting hood, the air blowing head is arranged adjacent to the air blowing head which is erected around the second hot metal / slag outlet. Further, as described above, the directions of rotation of the artificial tornadoes generated by the two air blowing heads arranged adjacent to each other are set in the relations opposite to each other, so that both artificial tornadoes are mutually promoted and at the same time interference is prevented. Is.

The present invention according to claim 4 is the same as in the present invention according to claim 1, further comprising: a hot metal ladle / in an air blowing head provided upright around the second hot metal / slag outlet.
The air blowing direction of the air blowing nozzle located at the lowest end level of the dust collecting hood directly above the ladle ladle should be directed diagonally downward toward the ladle ladle / receptacle mouth A cylindrical air curtain is formed in the gap between the hot metal ladle and the molten metal ladle.

[0014]

According to the present invention, the following effects are obtained. A dust collecting hood is provided around the hot metal / molten slag outlet, and an air blowing head and an air suction port are provided around the dropping port. A tornado was generated. Therefore, the dust generated at the outlet portion is surely sucked and collected by the suction duct of the dust collecting hood due to the swirl convergence of the artificial tornado, and the dust around the outlet portion can be efficiently collected.

That is, the air blowing head is arranged horizontally around the first hot metal / melting sluice outlet part from the hot metal gutter / melting slag gutter to the tilting sluice, and horizontally at the outlet part. By generating an artificial tornado along the direction, it is possible to efficiently collect the dust around the first molten metal / molten metal slag drop portion from the molten metal gutter / molten gullet to the tilting gutter.

Further, an air blowing head is erected around the second hot metal / slag drop opening from the tilting gutter to the hot metal ladle / slag pan to generate an artificial tornado along the vertical direction at the drop opening. The second hot metal from the tilted gutter to the hot metal ladle / slag ladle /
It is possible to efficiently collect dust around the molten metal outlet.

As described above, it is possible to improve the dust collection efficiency around the hot metal / molten slag opening portion, and to enable sufficient dust collection while reducing the amount of dust collection air. As a result, the working environment can be improved, and the blast furnace construction cost and the operating cost (electric power cost) can be reduced. In addition, the spread of dust in the dust hood is localized by an artificial tornado to improve the visibility of the hot metal / molten slag mouth, the hot metal ladle / slag ladle's iron / slag level monitoring, and the tilting gutter. It facilitates the monitoring and control of the desiliconization lance insertion position, thus improving the production efficiency.

The inner wall surface of the dust collecting hood around the first and second molten pig iron / molten slag openings is formed on a part of a cylindrical surface which is substantially coaxial with the central axis of the artificial tornado generated in these spill openings. The formation of the artificial tornado facilitates the generation of the artificial tornado, and the artificial tornado can be generated with less energy.

The air blowing head disposed around the first molten metal / molten slag opening portion and the air blowing head standing upright around the second molten iron / molten slag opening portion are used to collect dust. When bending and setting one of the air blowing heads so that they are parallel to each other on the side where the hood is connected, set the rotation directions of the artificial tornadoes that will be adjacent to each other in opposite directions. As a result, the tangential flow of vortices of adjacent artificial tornadoes becomes common. As a result, both artificial tornadoes promote each other and at the same time do not interfere.

The dust collecting hood is located at the lowest end level of the dust collecting hood directly above the hot metal ladle / slag ladle, and the air blowing direction of the air blowing nozzle of the air blowing head is directed diagonally downward at the same time as the turning direction. By forming a cylindrical air curtain in the space between the hot metal ladle and the slag ladle, suction of external air from the space is prevented, and the dust collection efficiency is reliably improved.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic view showing an embodiment of a dust collector around a hot metal outlet, FIG. 2 is a sectional view taken along line II-II in FIG. 1, and FIG. 3 is a line III-III in FIG. FIG. 4 is a schematic diagram showing a swirling airflow forming state by an air blowing head, FIG. 5 is a schematic diagram showing the principle of generation of an artificial tornado, and FIG. 6 is a schematic diagram showing a blast furnace cast bed 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 smelter 15 is used to separate the slag, the hot metal is poured into a hot metal gutter 16 and the slag is poured into a 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. Further, the molten slag poured into the molten slag gutter 17 is continuously received by the left and right molten slag ladles 22 by the tilting gutter 21. still,
After tapping, the tapping port 12 is closed by the mud gun 23.

At this time, the hot metal dropped from the hot metal gutter 16 to the tilting gutter 19 is received by one of the left and right hot metal ladles 20, and when the hot metal ladle 20 becomes full, the tilting device 24 causes the tilting gutter 19 to move to the other. Switch to hot metal pot 20. And
The filled hot metal ladle 20 is replaced with an empty hot metal ladle 20. By repeating this, the hot metal from the blast furnace 10 can be continuously received (the tilting gutter switching system).

Here, the first hot metal outlet A from the hot metal gutter 16 to the tilting gutter 19 and the second part from the tilting gutter 19 to the hot metal ladle 20.
The hot metal outlets B and C are corresponding dusting areas. In this embodiment, the hot metal gutter 1 of the above-mentioned outlets A, B, C
6, the tilting gutter 19 is surrounded by the dust collecting hood 30, and the suction ducts 31A, 31A, 31B connected to the dust collecting hood 30.
31C prevents dust generation outside the hood 30. Thirty
B and 30C are hot metal drop openings provided in the hood 30. Three
2 is an exhaust fan.

The dust collecting hood 30 is provided with an opening for monitoring the level of the hot metal of the hot metal ladle 20 and for monitoring the slant gutter 19 or an opening for desiliconizing lance for pretreatment of the hot metal (not shown). (Shown). Further, the dust collecting hood 30 cannot surround the passage area of the hot metal ladle 20, and the hot metal drop ports 30B and 30C of the dust collecting hood 30 are provided with a constant space G between the hot metal ladle 20 and the hot metal receiving port 20A. ing. And the dust collecting hood 30
In order to avoid the interference with the hot metal adhering to the hot metal port 20A, the space G is relatively large, and when one of the left and right hot metal ladle 20 is full, a full hot metal ladle 20 is replaced with an empty hot metal ladle 20. When replaced with, the space G becomes even larger.

However, in the present embodiment, the dust collecting hood 30 has an opening for monitoring the level of the hot metal of the hot metal ladle 20 and for monitoring the tilting trough 19 or a desilvering lance insertion opening, and Despite the large space G between the dust collecting hood 30 and the hot metal pan 20A of the hot metal ladle 20, in order to avoid an increase in the suctioned air volume of the hood 30, the following configurations (1) to (4) are provided. Is adopted.

(1) Dust collector 100 around the first hot metal drop port A From the hot metal spout 16 to the tilt spout 19 Around the hot metal spout part A on both sides in the horizontal direction of the upper part of the slant spout 19 Four air blowing heads 40 are provided (see FIG. 4). Each air blowing head 40 has a large number of air blowing nozzles 4 in the axial direction.
It has 0A. Then, the swirling airflow b is formed around the outlet A by the wake action of the air curtain a formed by the air blown from each air blowing head 40. Reference numeral 42 is an air supply fan.

Further, in the axial direction of the swirling air flow b, air suction ports 41A and 41A which are connected to the suction ducts 31A and 31A of the dust collecting hood 30 are provided.

As a result, in the present embodiment, the artificial tornado c along the horizontal direction is generated at the outlet A by the simultaneous operation of the air blowing head 40 and the air suction port 41A, and the generation at the outlet A is generated. The dust is surely sucked and collected in the suction duct 31A of the hood 30 by the vortex convergence of the artificial tornado c.

As shown in FIG. 5, the principle of generation of this artificial tornado is that the flow direction of the air curtain a blown from the air blowing head 40 is regulated so as to circumscribe each other in a circle centered on the outlet A. To form a swirling air flow b, and the air suction port 41A sucks the central part of the swirling air flow b to form a negative pressure region (core) e along the center of the swirling air flow b. The vortex of the swirling airflow b is the central core e
The continuous artificial tornado c is generated toward the air suction port 41A while converging to.

The air blowing head 40 is controlled from the air blowing nozzle 40A according to the amount of dust generated at the outlet A, the dust generating range, etc. by an air volume adjusting valve 40B provided in the air supply path. The amount of air blown out can be adjusted, and an appropriate artificial tornado c can be formed at the outlet portion A. The air volume adjusting valve 40B is automatically controlled or manually controlled according to the output of a dust meter provided around the outlet A.

Further, the air blowing head 40 can adjust the air blowing angle from the nozzle 40A according to the amount of dust generated at the outlet A, the range of dust generation, etc. by the rotating device 40C. An appropriate artificial tornado c can be formed on the part A. The rotating device 40C is automatically controlled or manually controlled according to the output of a dust meter provided around the outlet A.

Further, the air suction port 41A can adjust the air suction amount according to the dust generation amount at the outlet A, the dust generation range, etc., by an air flow rate adjusting valve 41B or the like provided in its exhaust path. Therefore, it is possible to form a proper artificial tornado c at the outlet portion A. The air volume adjusting valve 41B is automatically controlled or manually controlled according to the output of a dust meter provided around the outlet A.

Further, in the dust collecting hood 30, the inner wall surface 61 around the hot metal drop port A is formed by a part of a cylindrical surface which is substantially coaxial with the horizontal axis, whereby an artificial tornado around the drop port A is formed. I try to promote the generation of c.

The direction of rotation of the artificial tornado c generated around the outlet A is set so as not to oppose the flow of hot metal at the outlet of the hot metal gutter 16, that is, the direction shown in FIG. It is good to promote the generation of tornado c.

(2) Dust collector 200 around the second hot metal outlet B (same for C) 200 Vertical direction around the hot metal outlet B from the tilting trough 19 in the dust collecting hood 30 to the hot metal ladle 20 Four air blowing heads 50 are erected on the. Each air blowing head 5
No. 0 has a large number of air blowing nozzles 50A in the axial direction. Then, the swirling air flow b is formed around the outlet B by the wake action of the air curtain a formed by the air blown from each air blowing head 50.

Further, above the swirling air flow b in the axial direction, an air suction port 51A connected to the suction duct 31B of the dust collecting hood 30 is provided.

As a result, in the present embodiment, the artificial tornado c along the vertical direction is generated in the outlet B by the simultaneous operation of the air blowing head 50 and the air suction port 51A, and the emission generated in the outlet B is generated. The dust is surely sucked and collected in the suction duct 31B of the dust collecting hood 30 by the vortex converging property of the artificial tornado c.

The air blowing head 50, like the air blowing head 40, is capable of adjusting the air blowing amount and the air blowing angle from the air blowing nozzle 50A, so that an appropriate artificial tornado c can be attached to the outlet B. It can be formed. still,
50B is an air volume adjusting valve, and 50C is a rotating device.

Further, the air suction port 51A, like the air suction port 41A, is capable of adjusting the amount of air suction so that an appropriate artificial tornado c can be formed at the outlet B. 5
1B is an air volume adjusting valve.

Further, in the dust collecting hood 30, the inner wall surface 62 around the hot metal outlet B is formed by a part of a cylindrical surface which is substantially coaxial with the vertical axis, whereby an artificial tornado around the outlet B is formed. I try to promote the generation of c.

(3) Relationship between Artificial Tornado of Outlet Portion A and Outlet Portion B (C) Air blowing head 5 standing upright around the outlet port B (C)
0 is bent in the horizontal direction as shown in FIG. 1 on the side where the dust collecting hood 30 is connected, so that the dust collecting hood 30 is disposed adjacent to the air blowing head 40 disposed around the outlet A in a substantially parallel manner. As a result, the air blowing head 5 is released at the outlet B (C).
It is possible to prevent the artificial tornado c generated in the vertical direction by 0 from interfering with the horizontal artificial tornado c generated in the outlet A at the upper part thereof. Further, the rotation direction Na of the artificial tornado c generated by each of the air blowing heads 40, 50 arranged adjacent to each other in this way and Nb (Nc) are in the opposite directions as shown in FIG. Is set. As a result, both artificial tornadoes c, c are mutually promoted in their boundary contact areas, and at the same time interference is prevented.

At this time, the air suction port 41A for the outlet port A and the air suction port 51 for the outlet port B (C).
A and A may be common and unified.

As a modification of the present invention, the air blowing head 40 disposed around the outlet A is provided with a dust collecting hood 30.
Bend in the vertical direction at the connection side with
It may be arranged substantially parallel to and adjacent to the air blowing head 50 provided upright around (C). At this time,
It is possible to set the rotation directions of the artificial tornadoes c generated by the air blowing heads 40, 50 arranged adjacent to each other so as to be opposite to each other, thereby promoting both artificial tornadoes and simultaneously preventing interference. . Furthermore, at this time,
Air suction port 41A for the outlet A and outlet B (C)
The air suction port 51A for the above may be unified and unified.

(4) The air curtain f in the space G between the hot metal ladle 20 and the dust collecting hood 30. The air blowing head 5 provided upright around the outlet B (C).
At 0, the blowing direction of the air blowing nozzle 50A located at the lowest end level of the dust collecting hood directly above the hot metal ladle 20 is set at the same time as the direction of the swirling air flow b and the receiving port 2 of the hot metal ladle 20.
A cylindrical air curtain f is formed in the gap between the dust collecting hood 30 and the hot metal ladle 20 by directing it obliquely downward toward 0A (FIGS. 1 and 2). As a result, suction of external air from the space G is prevented, and the amount of dust collection suction air can be significantly reduced.

The operation of this embodiment will be described below. A dust collecting hood 30 is provided around the first outlet A from the hot metal gutter 16 to the tilting trough 19, and four air blowing heads 40 are provided horizontally above the tilting trough 19 around the outlet A. And an air suction port 41A are provided.
An artificial tornado c was generated along the horizontal direction. Therefore, the dust generated at the outlet portion A is surely sucked and collected by the suction duct 31A of the dust collecting hood 30 by the swirl convergence of the artificial tornado c, and the dust around the outlet portion A can be efficiently collected. Can be done.

In addition, the second from the tilting trough 19 to the hot metal ladle 20
The dust collecting hood 30 is provided around the outlets B and C, and four air blowing heads 50 and air suction ports 51A are provided in the vertical direction around the outlet B, and these air blowing heads are provided. An artificial tornado c along the vertical direction was generated at the outlets B and C by 50 and the air suction port 51A. Therefore, the dust generated at the outlets B and C is surely attracted by the suction duct 31B of the dust collecting hood 30 due to the swirl convergence of the artificial tornado c.
It is possible to efficiently collect dust around the outlets B and C by suction and collection.

As described above, it is possible to improve the dust collection efficiency around the outlets A, B and C, and to achieve sufficient dust collection while reducing the amount of collected air to 1/2 to 1/3 of the conventional one. can (4000~8000m ³ / min the conventional dust collecting air volume in normal 2500~4000m ³ / min, in at casthouse desiliconization embodiment). This improves the working environment,
Blast furnace construction costs and operating costs (electricity costs) can be reduced. In addition, the spread of dust in the dust collecting hood 30 is localized by the artificial tornado c to improve the visibility of the outlets A, B, and C, monitor the level of the hot metal of the hot metal ladle 20, monitor the slant gutter 19, It makes it easier to control the desiliconization lance insertion position and improve production efficiency. For example, the casting bed desiliconization lance position can be controlled with high accuracy, and the desiliconization efficiency is significantly improved.

The inner wall surfaces 61, 62 of the dust collecting hood around the first and second molten pig iron outlets A, B, C are substantially coaxial with the central axis of the artificial tornado c generated at these outlets. By forming a part of the cylindrical surface, the generation of the artificial tornado c is promoted, and the artificial tornado c can be generated with less energy.

An air blowing head 40 arranged around the first outlet portion A and an air blowing head 50 standing upright around the second outlet portion B (C) are assembled together. When one of the air blowing heads 40 and 50 is bent and set to be adjacent to each other so as to be parallel to each other on the side where the dust hood 30 is connected, the rotation directions Na and Nb (of the artificial tornado c that will be adjacent to each other) ( By setting Nc) in a relationship opposite to each other, the tangential flow of the vortices of the adjacent artificial tornadoes c, c becomes common. As a result, the two artificial tornadoes c, c mutually promote and at the same time do not interfere.

By directing the blowing direction of the air blowing nozzle 50A of the air blowing head 50, which is located at the lowest end level of the dust collecting hood directly above the hot metal ladle 20, to the oblique downward direction at the same time as the turning direction, the dust collecting hood 30 And hot metal pot 20
The cylindrical air curtain f is formed in the space G to prevent the external air from being sucked from the space G, and to reliably improve the dust collection efficiency.

In the above embodiment, four air blowing heads 40 and 50 are provided around the outlets A, B and C, respectively.
However, the number of air blowing heads provided at each outlet may be any number as long as it can generate an artificial tornado, and it is particularly preferable to be three or more.

Further, although the above embodiment has been described with respect to the case where the present invention is embodied as a dust collector around the hot metal drop port, the present invention is substantially the same as a dust collector around the molten metal drop port. Of course, it can be applied to.

[0054]

As described above, according to the present invention, the dust collection efficiency around the molten pig iron / slag slag portion is significantly improved, and sufficient dust collection is possible while reducing the amount of dust collection air. It is possible to improve production efficiency.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an embodiment of a dust collector around a molten pig iron outlet.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a schematic diagram showing a swirling airflow forming state by an air blowing head.

FIG. 5 is a schematic diagram showing the principle of generation of an artificial tornado.

FIG. 6 is a schematic diagram showing a blast furnace casting floor layout.

[Explanation of symbols]

 10 blast furnace 16 hot metal gutter 17 hot metal gutter 19 leaning gutter 20 hot metal ladle 21 leaning gutter 22 hot metal ladle 30 dust collecting hood 31A, 31B, 31C suction duct 40 air blowing head 40A air blowing nozzle 41A air blowing head 50A air sucking head Air blow nozzle 51A Air suction port Na, Nb, Nc Rotation direction of artificial tornado 61, 62 Dust collecting hood inner wall surface a, f Air curtain b Swirling air flow c Artificial tornado

Claims (4)

[Claims] 1. A first hot metal / slag spout opening from a hot metal gutter / slag sluice to a slant gutter, and a second hot metal / metal slag / slag pan from a slant gutter.
In the dust collector around the hot metal / molten slag mouth part of the blast furnace, in which the hot metal / molten slag mouth part of the above is covered by a dust collecting hood, the tilting gutter upper part is provided around the first hot metal / molten slag mouth part. An air blowing head is arranged in the horizontal direction, and a swirling airflow is formed around the outlet by the wake action of an air curtain formed by the blowing air from the air blowing head. An air suction port is provided on the upper side, and an artificial tornado along the horizontal direction is generated in the drop port portion by the simultaneous operation of the air blowing head and the air suction port, and the surrounding of the second hot metal / slag drop port portion is generated. An air blowing head is erected vertically, and a swirling airflow is formed around the outlet by the wake action of an air curtain formed by the blowing air from the air blowing head. An air suction port is installed above By simultaneous operation of the air blowing head and the air suction port of the blast furnace, characterized in that for generating an artificial tornado along the vertical direction to the Ochiguchi unit molten iron /
Dust collector around the slag outlet. 2. A cylindrical surface which is substantially coaxial with a central axis of an artificial tornado generated at the outlets of inner wall surfaces of the dust collecting hoods around the first and second molten pig iron / slag outlets. 2. The dust collector around the hot metal / molten slag opening part of the blast furnace according to claim 1, wherein the dust collecting device is formed by a part of the above to promote the generation of an artificial tornado. 3. The first molten metal / molten metal by bending an air blowing head standing upright around the second molten metal / molten metal outlet part in the horizontal direction at the connection side with the dust collecting hood. The air blowing head is disposed adjacent to the air blowing head disposed around the outlet, or the air blowing head disposed around the first hot metal / slag outlet is connected to the dust collecting hood. By bending in the vertical direction, it is placed adjacent to the air blowing head that is erected around the second molten pig iron / slag outlet, and both of the air blowing heads that are placed adjacent to each other as described above are generated. 2. The dust collector around a molten pig iron / slag slag of a blast furnace according to claim 1, wherein the rotating directions of the artificial tornadoes to be set are set in the opposite directions so as to promote both of the artificial tornadoes and at the same time prevent interference. 4. An air blowing head positioned upright around the second molten pig iron / molten slag spout part, wherein the air blowing nozzle is located at the lowest end level of the dust collecting hood directly above the molten pig ladle / slag ladle. The air blowing direction is directed diagonally downward toward the hot metal ladle / slag ladle pan / mouth, and a cylindrical air curtain is formed in the gap between the dust collection hood and the ladle / slag pan. The dust collector around the hot metal / slag spill port of the blast furnace according to claim 1.