JPH09316508A - Method for collecting dust for tilting trough part in blast furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently collect the dusting around a molten iron dropping hole part to a torpedo car from a tilting trough with a dust collecting hood without leaking to the other part. SOLUTION: Nozzles 30 for gas curtain are arranged at each inside of a lower end opening part 18 arranged in the dust collecting hood 16, and in the case two sets of the torpedo cars 11 exist just below the lower end opening parts 18 corresponding to the torpedo cars in order to receive the molten iron or wait the receiving of molten iron, gas jetting from the nozzle 30 for gas curtain is interrupted. Then, in the case the torpedo car does not exist just below the lower end opening parts 18 in order to switch the torpedo car 11, the gas jetting from the nozzle 30 for gas curtain is executed to form the gas curtain 31 and the sucking quantity from the lower end opening part 18 is shut off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tip part of a taphole gutter,
A lower end opening is defined by a level directly above the respective receiving ports provided in the two melt containers surrounding the tilting trough and the melt falling flow from the tilting trough directly below the tip end part and below the tilting trough. The present invention relates to an improvement in a dust collection method for a tilting gutter of a blast furnace using a dust hood.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 11, a tap hole 3 provided at a lower portion of a furnace body 2 constituting a blast furnace 1 is opened by using a hole punching machine 4, and hot metal in the blast furnace 1 is tapped. Skinma 6 poured into the tap pipe 5 extending to the front of the mouth 3 and arranged in the tap pipe 5
After the hot metal and the molten metal are separated to some extent by utilizing the difference in specific gravity, the molten metal is flown from the skinma 6 to the molten metal gutter 7 and the molten metal is flowed to the molten metal gutter 8. The hot metal poured into the hot metal gutter 7 is continuously received while switching from the tilting gutter 10 to the left and right tope dokers 11 used as hot metal containers. On the other hand, the molten slag poured from the skinma 6 into the molten slag 8 is passed through the tilting gutter 12 to the left and right molten slag pans which are receiving containers.
It is continuously received while switching to 13. In addition, blast furnace 1
After tapping out the metal, the tapping port 3 is closed using a mud gun 14.

At this time, as shown in FIG. 12, the hot metal that has fallen from the hot metal gutter 7 into the tilting gutter 10 is desiliconized by a desiliconizing agent that is injected using, for example, a desiliconizing injection lance 9, and then one of the Received by Topeed Car 11. When a predetermined amount of hot metal is filled in this tope car 11, the tilting gutter 10 is tilted to the opposite side to switch to the other empty tope car 11 that has been waiting in advance to start receiving pig iron, as shown in FIG. At the same time, the received pigeon car 11 is replaced with another empty pigeon car 11. By repeating such replacement, the hot metal in the blast furnace 1 can be continuously received by the speeded car 11.

As described above, when the molten metal is received in the tope car 11 or in the molten metal ladle 13, the slant gutters 10 and 12 are used.
It is widely practiced to inject while switching using. This is because the amount of tapping metal and slag in one time of the blast furnace 1 is much larger than the capacity of the tope car 11 and the slag pan 13, so it is necessary to switch to a plurality of tope car 11 and the slag pan 13 to receive. For this reason, the reason why the tilting gutters 10 and 12 are used here is that the switching work can be performed efficiently. For example, the tope car 11 that is filled with a predetermined amount of hot metal by the pig iron is pulled out from the pig iron position, and is located at a remote steelmaking plant or a pig iron machine, or a desulfurization facility, a dephosphorization facility or the like provided along the way. Transported to hot metal pretreatment facility. Further, the molten slag pan 13 filled with the molten slag by the slag is transported to the molten slag processing equipment for producing a by-product using the molten slag.

By the way, the hot metal drop part A from the hot metal gutter 7 to the tilting gutter 10 and the hot metal drop parts B and C from the tilting gutter 10 to the left and right topped cars 11 respectively correspond to dust generating regions. Therefore, the tip portion of the hot metal gutter 7, the tilting gutter 10 immediately below this tip part, and the hot metal falling flow from the tilting gutter 10 are enclosed, and the respective receiving ports 20 provided in the two tope car 11 located below the tilt gutter 10 are provided. Dust collecting hood with the lower opening 18 at the level directly above
Install 16. Suction duct connected to this dust collection hood 16
Due to the suction to the suction port 19 connected to 17
The dust generated in B and C is collected.

Both lower end openings 18 provided in the dust collecting hood 16
If two Topeed cars are pulled in,
Since the gap between the lower end opening 18 and the receiving port 20 provided in the tope car 11 is small and the inflow air volume is small, the dust collection efficiency is good,
Even if the amount of desiliconizing agent injected into the hot metal is large, the dust collecting hood 16
Can collect dust. As described above, after pulling out one of the speeded car 11 that has finished receiving the pig iron from the pig iron position, during the replacement work period when the next tope car 11 is pulled into the pig iron position, as shown in FIG. There will only be one Topeed Car 11.

For this reason, when the speeded car 11 is absent,
The lower end opening 18 of the dust collecting hood 16 is in a completely open state, from which a large amount of air is sucked, and the dust-containing hood 16 corresponding to the pigeon car 11 on the pig iron side can suck out gas containing dust. It disappears and dust 26 is generated on the casting floor surface. Especially with the spread of hot metal pretreatment process,
Since a desiliconizing agent is driven into the hot metal of No. 10 by the desiliconization driving lance 9 or a desiliconizing agent is added at the hot metal gutter 7 located on the upstream side of the tilting gutter 10, the decanting trough 10 and the tope-doker 11
Dust from inside becomes significant.

[0008] As a result, the toped car through the tilt gutter 10
Dust collection hood provided around the hot metal outlet to 11
Even if dust is sucked through the suction port 19 connected to the suction duct 17 connected to 16, dust generation 26 from the vicinity of the desiliconization driving lance 9 or the monitoring window opening 25 to the casting floor 24 becomes intense, and the work environment It becomes difficult to monitor the deterioration and the status of the pigeon car 11.
Therefore, when the amount of dust generated is large, a situation has often occurred in which the amount of dusting agent is reduced to limit or interrupt the desiliconizing process to reduce the amount of dust generated. The reason why the dust collection condition by the dust collection hood 16 deteriorates is that the dust collection hood is
Of the two tope cars 11 that were positioned so as to close the lower end opening 18 of the 16, when one of them is absent, the ventilation resistance decreases and the suction flow 27 from the lower end opening 18 increases. This is because the amount of suctioned air from the dust spot is reduced.

As means for effectively collecting dust by means of a dust collecting hood 16 provided so as to surround the periphery of the molten iron drop opening on the toped car 11 via the inclined trough 10, Japanese Patent Laid-Open No. 8-81018 discloses As shown in FIG. 14, a dust collecting hood 16 is provided around the molten pig iron outlet, and three or more gas blowing heads 21 are erected inside the dust collecting hood 16 and the height direction of each gas blowing head 21 is increased. The gas is blown out from the swirling gas nozzle 22 arranged in the. Due to the wake action of the gas blown out from the swirling gas nozzle 22, a swirling gas flow is formed around the outlet. And a suction duct connected to the dust collection hood 16.
It has been proposed that the gas is sucked into the gas suction port 19 connected to 17 to generate an artificial tornado of gas around the outlet part to improve the dust collection efficiency.

[0010]

However, since it is unavoidable that the speeded car 11 is absent below the dust collecting hood 16 due to the replacement of the speeded car 11, even if this means is used, the replacement is not possible. During the work, the lower end opening 18 of the dust collecting hood 16 is fully opened, from which a large amount of air is sucked, and the tope car 11 on the piggy-hole side.
The phenomenon in which the dust collection efficiency from the dust collection hood 16 corresponding to 1 is recognized is the same as the above case.

As a measure against deterioration of dust collection during replacement work of the tope car 11, a dust cover or a slide system lid is attached to the lower end opening portion 18 provided on the dust collection hood 16, and the dust collection hood 16 is replaced when replacing the tope car 11. There is known a means for reducing the amount of suctioned air by covering the lower end opening 18 of the. However, with such means, splashes of molten pig iron, slag, and the like scattered on the rotating part and the slide rail part are fixed, so that troubles that these do not move often occur, and it is not possible to achieve the target reduction of the suction air volume. . Also, if the lid does not move with the lower end opening 18 blocked, operation cannot be performed, so it is often left unused or removed.

The present invention solves the above-mentioned problems of the prior art, and receives the molten material from the blast furnace while switching from one hot water receiving container to the other hot water receiving container through a tilting gutter,
Due to the replacement work of the hot water container, even if the hot water container is not present at the lower end opening position of the dust collecting hood provided around the molten metal outlet, An object of the present invention is to provide a dust collecting method for a tilting gutter of a blast furnace, which can reduce the invasion of the atmosphere, can efficiently collect dust, and can prevent the occurrence of troubles caused by a movable device. Is.

[0013]

The inventors of the present invention measured the pressure in the dust collecting hood on the inclined trough and found that the two topedocars corresponded to the two lower end openings provided in the dust collecting hood. The pressure in the dust collection hood increased sharply when one tope car was absent due to replacement as compared to when the was pulled in. This is because the tope car was absent on one side of the lower end openings of the two dust collecting hoods, the opening area was expanded, and excess atmospheric air flowed from the lower end openings. For this reason, when replacing the tope car, if the amount of air that flows in from the lower end opening of the dust collection hood is reduced, the dust collection efficiency does not decrease, and the amount of desiliconizer is not dropped or stopped without removing the hot metal. The benefits of silicidation can be obtained.

The present invention has been achieved as a result of various studies on means for reducing the amount of inflowing air when a piggyback container is not present at the lower end opening of the dust collecting hood. The main points are as follows. In order to achieve the above object, the present invention according to claim 1 surrounds a tip end portion of a tap pipe, a tilting gutter directly below the tip end portion, and a molten material falling flow from the tilting gutter, and is located below the tilting gutter. A dust collecting method for a tilting trough part of a blast furnace, which uses a dust collecting hood in which a lower end opening is located just above the respective receiving ports provided in two hot metal containers, the lower end opening being provided in the dust collecting hood. The gas curtain nozzles are arranged on the inner sides of the gas curtain nozzles, and when the two hot metal containers are present immediately below the lower end openings corresponding to the hot metal or the hot metal standby, respectively, the gas curtain nozzles. Substantially interrupting the gas injection from the, when the hot metal container is absent immediately below the lower end opening for replacement, forming a gas curtain from the gas curtain nozzle to form a gas curtain, the hot metal container Open the lower end corresponding to the absent side A dust collecting method devote trough of a blast furnace, characterized in that blocking suppress suction flow from parts.

According to a second aspect of the present invention, there are provided two molten pig irons which surround a tip portion of the tapping gutter, a tilting gutter directly below the tip end portion, and a molten material dropping flow from the tilting gutter, and which are located below the tilting gutter. A method of collecting dust in a tilting gutter part of a blast furnace using a dust collecting hood in which the level directly above each receiving port provided in a container is the lower end opening, and the inside of each of the lower end openings provided in the dust collecting hood. A nozzle for gas curtain and a nozzle for swirling gas are arranged, and when the two hot metal containers are present immediately below the lower end opening for receiving pig iron or waiting for pig iron, gas injection from the nozzle for gas curtain While substantially interrupting, while forming a swirling gas flow in the dust collecting hood by the gas injected from the swirling gas nozzle arranged at the lower end opening corresponding to the hot metal container on the receiving side, to the dust collecting hood Connect to the connected suction duct When an artificial tornado is generated by suction to the air port and dust is collected, and when the hot metal container is absent just below the lower end opening due to replacement, a gas curtain is injected from the gas curtain nozzle. To form
A dust collecting method for a tilting gutter of a blast furnace, characterized in that a suction flow from a lower end opening corresponding to the side where the hot metal container is absent is blocked.

According to a third aspect of the present invention, the gas supply sources of the gas curtain nozzle and the swirling gas nozzle are the same, and dust is collected in the tilting gutter portion of the blast furnace according to the second aspect. Is the way. The present invention according to claim 4 is
4. The dust collecting method for a tilted gutter part of a blast furnace according to claim 1, 2 or 3, wherein gas injection from the gas curtain nozzle and the gas swirling nozzle is performed by using the tilting gutter switching signal. .

According to a fifth aspect of the present invention, there are provided two molten pig irons which surround a tip portion of the tapping gutter, a slant gutter directly below the tip portion, and a molten material falling flow from the slant gutter, and which are located below the slant gutter. A method for collecting dust in a scouring part of a blast furnace using a dust collection hood having a bottom opening as the level directly above each receiving port provided in the container, and at a level substantially the same as the upper level of the receiving port of the pig iron container. Two movable carriages having a flat plate for the lid horizontally arranged corresponding to each of the hot metal containers are provided at the dust collecting hood at a closed position below a lower end opening and a retracted position apart from below the lower end opening. And the two hot metal containers are directly under the lower end openings corresponding to the pig iron or the pig iron waiting state, the movable carriage is moved to the retracted position. The lower end opening by the receptacle of the hot metal container. In order to prevent the suction flow from being blocked, when the molten pig iron container is absent, the movable carriage is moved to the closed position, and the lower end opening is closed by the lid flat plate to block the suction flow. This is a dust collection method for the inclined trough of the blast furnace.

According to a sixth aspect of the present invention, the movable carriage is arranged so as to be movable in the closed position direction by gravity of weights that are laid by a plurality of pulleys arranged in the vicinity of the dust-collecting hood via wires or the like. 6. The method for collecting dust in a tilted gutter part of a blast furnace according to claim 5, wherein the dust collecting part is provided so as to be movable in a retreat position direction when the hot metal container is moved to a hot metal receiving position.

According to the present invention of claim 7, the tapping gutter and the molten pig iron container are a molten slag gutter and a molten slag container, respectively. This is the dust collection method for the gutter.

[0020]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic vertical cross-sectional view of a dust collector around a molten pig iron drop portion suitable for implementing the present invention. Note that, in FIG. 1, the same components as those of the conventional dust collector around the molten pig iron drop portion shown in FIG.

According to the present invention, as shown in FIG. 1, the hot metal dropped from the hot metal gutter 7 into the tilt pouring gutter 10 is desiliconized by a desiliconizing agent injected using a desiliconization driving lance 9, and then the tilt pouring gutter. One of the topeed cars 11 has received the pig from 10 and the other topede car 11 is waiting for the next pig. At this time, as shown in FIG. 2, the hot metal drop portion A from the hot metal gutter 7 to the tilting gutter 10
Hot metal drop B from left and right spouts 10 to the tope car 11
C is a corresponding dust-generating area. Therefore, the tip of the hot metal gutter 7 and the tilting gutter 10 and the tilting gutter 10 directly below the tip.
A dust collecting hood 16 is provided which surrounds the hot metal falling flow from the above and which forms the lower end opening 18 at the level just above the receiving port 20 provided in the two topeed cars 11 located below the slant gutter 10. By the suction to the suction port 19 connected to the suction duct 17 connected to the dust collecting hood 16, the dust generated at the hot metal falling portions A, B and C is collected in the dust collecting hood 16.

In this case, since dust is intense from the tope car 11 during pig iron reception, it is necessary to positively suck the dust through the lower end opening 18 of the dust collection hood 16.
To collect dust by increasing the amount of dust collection air by suction to the gas suction port 19 connected to the suction duct 17 connected to 16. On the contrary,
The dust collection air volume may be small because the dust emission from the other tope car 11 on standby is small, and because the tope car 11 is located so as to block the lower end opening 18 of the dust collection hood 16, the dust collection hood Negative pressure is maintained inside 16, so there is little effect on the decrease in dust collection efficiency.

When a predetermined amount of hot metal is accumulated in the tope car 11 receiving the pig iron, as shown in FIG.
(Refer to FIG. 2), the tilting to the opposite side is completed and the piggy-bearing is completed, the other empty toped car 11 waiting is switched to, and piggy-backing is started. On the other hand, after the toeped car 11 that has completed the pig iron reception is pulled out from the pig iron reception position, a replacement work is performed to pull in the next empty toped car 11 to the pig iron reception position. By repeating such replacement, the hot metal tapped from the blast furnace 1 is continuously received by the pigeon car 11.

In this case, when the toeped car 11 which has finished receiving the pig iron is pulled out from the pig iron receiving position for the replacement work, the topedo car 11 is absent, and the lower end opening 18 of the dust collecting hood 16 is removed.
Is completely opened, and the suctioned air volume from here suddenly increases, and the inside of the dust collection hood 16 becomes positive pressure. Therefore, the dust collection from the dust collecting hood 16 corresponding to the pigeon car 11 on the hot metal side, which generates a lot of dust, suddenly deteriorates.Therefore, in the present invention, the area around the molten iron drop opening to the toeped car 11 through the inclined trough 10 is surrounded. A gas curtain nozzle 30 having a large number of injection holes in the horizontal direction is provided at the lower end opening 18 of the dust collecting hood 16 provided in the manner described above, or in a lower peripheral portion connected to the lower end opening so that the ejection direction thereof is slightly downward from the center. (In the drawing, one row each is provided on the lower end opening 18 for each of the left and right sides). Then, each of the gas curtain nozzles 30 arranged at the lower end opening portion 18 of the dust collecting hood 16 where the topedo car 11 is absent by pulling out the toeped car 11 that has completed the piggy-reel operation for replacing work A gas curtain 31 that crosses the lower end opening 18 of the dust collecting hood 16 is formed by the gas ejected from the gas collecting hood 16.

With this gas curtain 31, the dust collecting hood 16
By blocking the suction flow flowing from the lower end opening 18 of
Since the pressure inside the dust collecting hood 16 can be maintained at a negative pressure, it is possible to secure the dust collection by the dust collecting hood 16 corresponding to the toeped car 11 being received. Since the dust generated in the dust collecting hood 16 can be quickly sucked and removed, it is possible to easily monitor the state of piggy-back to the speeded car 11, and to improve the environment around the outlet.

Here, in order to completely block the inflow air from the lower end opening 18 of the dust collecting hood 16 by the gas curtain 31, it is necessary to make the amount of gas ejected from the gas curtain nozzle 30 huge. . But practically, the dust hood
Even if the inflow air from the lower end opening 18 of the 16 is suppressed, it is possible to obtain a sufficient dust collecting effect. On the other hand, the lower end opening of the dust collecting hood 16 corresponding to the pigeon car 11 being received.
18, the receiving port 20 of the speeded car 11 is located so as to close it, so even if the gas ejection from the gas curtain nozzle 30 arranged in this part is stopped, the inside of the dust collecting hood 16 is made negative pressure. Can be kept.

In the present invention, the lower end opening 18 of the dust collecting hood 16 is
The nozzle 30 for the gas curtain is only present in the part of No. 1, and since there is no moving part, it is possible to avoid the trouble that the splash etc. from the inside of the speede car 11 adheres and even if it solidifies, it becomes inoperable. it can. However, depending on the mounting position of the gas curtain nozzle 30 to the lower end opening 18 of the dust collecting hood 16, when the gas ejection from the gas curtain nozzle 30 is stopped, a splash is emitted from the tope car 11 in the pig iron, and the gas curtain There is a possibility that the nozzle adheres to the nozzle 30 and the nozzle is clogged. In this case, a small amount of gas is blown to the gas curtain nozzle 30 even during piggyback to the speede car 11 to prevent the functional deterioration due to nozzle clogging, and the gas injection forming the gas curtain 31 is substantially interrupted. To do. Even if the gas curtain nozzle 30 is clogged and loses its function, dust collection by the dust collection hood 16 is only deteriorated, and pig iron work of the speeded car 11 is possible, which is also an advantage of the present invention. is there.

Next, an embodiment in which a conventionally known dust collecting apparatus for generating an artificial tornado inside the dust collecting hood 16 is applied to the present invention will be described with reference to FIG. FIG.
As shown in FIG. 3, three or more pieces are provided inside the lower end opening 18 of the dust collecting hood 16 provided so as to surround the periphery of the molten iron outlet part of the topeed car 11 through the tilting gutter 10 or between the lower end of the dust collecting hood and the upper end of the topeed car. 6, a plurality of swirling gas nozzles 22 forming a swirling gas flow for generating an artificial tornado are arranged in the height direction in each gas blowing head 21. Set up. At the same time, a plurality of gas curtain nozzles 30 are arranged at the lower end opening 18 of the dust collecting hood 16 so that the ejection direction thereof is toward the center, as in the embodiment shown in FIG.

As shown in FIGS. 6 and 7, the principle of generation of an artificial tornado by a plurality of swirling gas nozzles 22 is such that the swirling gas nozzles 22 are arranged in the height direction of the gas blowing head 21.
The flow direction of the gas a formed by the gas ejected from the gas is regulated by the gas ejected from the swirling gas nozzle 22 on the downstream side so as to be circumscribed in the circle containing the falling portion.
By this, the swirling airflow b is formed, and when the swirling airflow b is sucked by the suction port 19 connected to the suction duct 17 connected to the dust collecting hood 16, a core in a negative pressure region is formed along the center of the swirling airflow b. . Due to the centripetal force of these combined actions, the continuous artificial tornado c toward the suction port 19 is generated while converging the vortex flow of the swirling air flow b to the central core. In order to generate such an artificial tornado c,
It is necessary to install at least three gas blowing heads 21, and the drawing shows a case where four gas blowing heads 21 are arranged. Also,
It is possible to form a gas curtain 31 that traverses the lower end opening 18 of the dust collecting hood 16 by the gas ejected from each gas curtain nozzle 30 arranged at the lower end opening 18 of the dust collecting hood 16.

By the way, in the case shown in FIG. 4, the lower end opening 18 of the dust collecting hood 16 corresponding to the pigeon car 11 on the side of the pig iron.
In addition, since the toeped car 11 is positioned so as to close the lower end opening 18 of the dust collecting hood 16, the gas ejection from the gas curtain nozzle 30 arranged at this portion is stopped, or the swirling gas nozzle concerned is stopped. A small amount of gas sufficient to prevent the splash from adhering to 22 can be substantially interrupted and a negative pressure can be maintained in the dust collection hood 16. At the same time, in order to improve the dust collection efficiency by the dust collection hood 16 corresponding to the speeded car 11 located on one of the receiving iron sides, four gas blowing heads are provided at the lower end opening 18 of the dust collection hood 16. Nozzle for swirling gas 21 provided in the vertical direction 22
A swirling airflow of gas is formed in the dust collecting hood 16 by the action of the wake of the gas ejected from. At the same time, when the ejected gas and the dust-containing gas are sucked into the suction port 19 connected to the suction duct 17 connected to the dust collection hood 16, the artificial tornado is generated by the gas swirling from the swirling gas nozzle 22 and the suction from the suction port 19. It is possible to efficiently collect dust generated from the tope car 11 without leaking to the outside of the dust collecting hood 16.

It is preferable that each gas blowing head 21 be capable of adjusting the gas blowing angle from the swirling gas nozzle 22 so that an appropriate artificial tornado c can be formed around the molten pig iron outlet. The amount of suction from the suction port 19 is adjusted by a flow rate adjusting damper (not shown) provided in the suction duct 17 according to the amount of dust generated at the hot metal drop portion, the dust generation range, and the like. Further, according to the operation status of the blast furnace 1, the blowing amount and the blowing angle of the gas jetted from the swirling gas nozzle 22 arranged in the gas blowing head 21 are adjusted, or the gas suction amount of the suction port 19 is adjusted. As a result, an artificial tornado c of appropriate gas is always formed at the hot metal outlet, and the dust collection efficiency is reliably improved.

On the other hand, as shown in FIG. 5, there is little dust generation on the side where the piggyback is stopped, and in particular, the topede car 11 is absent when it is pulled out of the piggyback position for the replacement work. There is no dust source in the
Rather, it is preferable to suppress the atmospheric suction flow from the lower end opening 18 of the dust collecting hood 16. Therefore, on the side where the piggyback is stopped,
In order to stop the gas ejected from the swirling gas nozzle 22 arranged for generating an artificial tornado at the lower end opening portion 18 of the dust collecting hood 16 or to prevent splash adhesion to the swirling gas nozzle 22. Keep a small amount of gas flowing.

Then, the lower end opening 18 of the dust collecting hood 16 is moved by the gas ejected from the lower end opening 18 of the dust collecting hood 16 or the gas curtain nozzles 30 arranged in the lower peripheral portion connected to the lower end opening. Form a gas curtain 31 across. The gas curtain 31 blocks and suppresses the atmospheric suction flow that flows in from the lower end opening 18 of the dust collection hood 16 located on the side where the tope car is not present, so that the pressure inside the dust collection hood 16 is maintained at a negative pressure. As a result, the suction air volume by the dust collecting hood 16 corresponding to the tope car 11 in the other pig iron is secured as in the case of the embodiment of the present invention shown in FIG.

As the gas supplied to the gas blowing head 21, air, water vapor, nitrogen gas or the like is used. As shown in FIG. 5, a dedicated blower 32 is installed as a gas supply source, a gas supply pipe 33 is provided, and the gas supplied from the blower 32 is guided to the gas blowing head 21 through the gas supply pipe 33, The gas is ejected from a swirling gas nozzle 22 arranged in the height direction of the blowing head 21. Blower 32
The gas supplied from can be used for the gas curtain nozzle 30 via the gas supply pipe 33. That is,
The operation such that gas is simultaneously supplied to the swirling gas nozzle 22 and the gas curtain nozzle 30 provided in the lower end opening 18 of the both dust collecting hoods 16 or the lower peripheral portion connected to the lower end openings is substantially performed. Since it does not exist, the switching valve 34 provided in the gas supply pipe 33 may be switched to supply the gas centrally to either one.

Further, in order to prevent nozzle clogging, when it is desired to supply a small amount of gas to the swirling gas nozzle 22 and the gas curtain nozzle 30, the opening degree of the switching valve 34 is adjusted so that the switching valve 34 is not completely closed. Alternatively, a bypass route for passing a small amount of gas may be provided in parallel with each switching valve 34. The switching valve
When it is desired to automate the switching operation of 34, the direction of the tilting angle due to the switching of the tilt gutter 10 is detected, and the switching is performed using this detection signal, whereby the automation can be easily performed.

Next, an embodiment of the present invention in which the lower end opening 18 of the dust collecting hood 16 is closed by the lid flat plate 35 at the same level as the receiving port 20 of the speeded car 11 will be described with reference to FIG. The top end opening of the dust collection hood 16 is absent until the tope car 11 that has finished receiving the pig iron is pulled out from the pig iron position for replacement work and the empty tope car 11 is pulled right under the lower end opening 18 because the tope car 11 is absent. The part 18 is completely opened, and the amount of suctioned air from this part increases rapidly. Therefore, among the lower end openings 18 of the dust collecting hood 16 provided so as to surround the periphery of the molten iron drop opening to the topedo car 11 via the inclined trough 10, the lower end opening 18 in which the topedo car 11 is absent,
A flat plate 35 for the lid is used instead of the topede car 11 so as to close it. That is, the two movable carriages 36 having the flat plate 35 for the lid horizontally arranged at the same level as the upper end level of the receiving port 20 provided in the topedo car 11 are provided at the closed position and the lower end below the lower end opening 18 corresponding to each. It is arranged so as to be movable between the retracted position separated from the lower side of the opening.

The reason why the lid flat plate 35 provided on the moving carriage 36 is set to be the same as the upper end level of the receiving port 20 provided on the tope car 11 is that the lower end opening 18 of the dust collecting hood 16 is filled with molten metal and slag. This is because the case where there is a large amount of scattering and these adhere to the flat plate 35 for the lid is taken into consideration, whereby the moving carriage 36 can travel on the rail 38 via the wheels 37 without any obstacle. It should be noted that, as shown in FIGS. 9 and 10, the moving carriage 36 does not have a drive device itself, and the wire is wound around two pulleys 28 arranged near the dust collecting hood 16.
It is connected to the weight 23 via 29 or the like. Two sets of weights 23, pulleys 28, and wires 29 are arranged apart from both sides of the rail 38 so as not to prevent the toped car 11 from traveling on the rail 38.

As shown in FIG. 9, when both the pigeon side and the piggy-standby side topede cars 11 are located directly under the lower end opening 18, the moving carriage 36 is pushed by the topede car 11. It is in the retracted position. For this reason, the lower end opening 18 of the dust collecting hood 16 is provided with a receiving port provided on the toped car 11.
Blocked by 20. In order to replace the pigeon car 11 that has finished receiving the pig iron, when pulling out in the arrow direction from the pig iron position directly below the lower end opening 18, the pusher car 11 is not pushed in, so the wire 29 hung on the pulley 28 by the gravity of the weight 23 is removed. The moving carriage 36 moves via the movement of the speeded car 11. Then, the moving carriage 36 stops immediately below the lower end opening 18 when the weight 23 is placed on the stopper 39. As a result, as shown in FIG. 10, the lower end opening 18 of the dust collecting hood 16 is closed by the lid flat plate 35 provided on the moving carriage 36. At this time, the stop height of the weight 23 can be adjusted by placing a spacer (not shown) on the stopper 39, and thus the horizontal position of the flat plate 35 for the lid with respect to the lower end opening 18 can be adjusted. .

Next, the lower end opening closed by the flat plate 35 for the lid
When the empty toeped car 11 moves to the position of 18, the moving cart 36 is pushed by the topedo car 11 against the gravity of the weight 23, reaches the retracted position, and the receiving port 20 of the topedo car 11 is at the lower end. The position is adjusted so that it is directly below the opening 18, and the tope car 11 is stopped. As a result, the lower end opening 18 of the dust-collecting hood 16 will be replaced by the topped car again.
It is blocked by the socket 20 of 11. Such a lower end opening 18
The suction flow from the lower end opening 18 is cut off and suppressed by replacing the speeded car 11 with the moving carriage 36 and moving operation in cooperation with the moving carriage 36, thereby reducing the amount of sucked air and collecting dust by the dust collecting hood 16 on the receiving side. Secure. The dust collecting effect of the lid flat plate 35 on the lower end opening 18 is similar to that of the above-described embodiment, and therefore detailed description thereof will be omitted. However, the swirling gas nozzle 22
It goes without saying that it can be used together with.

In each of the above embodiments, the case where the present invention is carried out as a dust collector around the hot metal outlet is described, but the present invention is shown in FIG. 11 in which the molten sluice 8 and the slant for the molten slag are poured. Needless to say, the present invention can be applied in substantially the same manner as a dust collecting device around the sludge spill opening portion using the gutter 12 and the slag ladle 13.

[0041]

As described above, according to the present invention, the pig-iron container or slag container corresponding to the bottom end opening of the dust collecting hood provided around the blast furnace or around the slag drop port. However, when it is absent for switching, the suction flow is suppressed by the gas curtain formed by the gas ejected from the gas curtain nozzle provided in the lower end opening, so that the dust collection efficiency is improved.

Further, a gas curtain nozzle and a swirling gas nozzle are provided at the lower end opening of the dust collecting hood, and the gas spouting from the swirling gas nozzle corresponding to the pig iron or slag side artificially surrounds the falling portion. When a tornado occurs, the dust collection hood can efficiently collect dust.
In this case, more rational dust collection can be performed by using the gas curtain nozzle and the swirling gas nozzle both as gas sources.

Further, instead of arranging the gas curtain nozzle, when the flat plate for the lid provided on the moving carriage is used to close the lower end opening of the dust collecting hood, the suction flow can be suppressed and the dust collecting can be suppressed. Efficiency is improved. Further, if the gas injection from the gas curtain nozzle and the swirling gas nozzle is performed using a signal for switching the gutter, automation can be facilitated.

As a result, the dust collection efficiency is improved by suppressing the amount of suction air around the molten iron and slag falling port of the blast furnace, and the status of pig iron reception in the pig iron receiver container and the status of receipt of the pig iron receiver container are satisfactorily monitored and operated. Environmental improvements are achieved.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a schematic vertical cross section of a dust collector around a hot metal drop portion from a tilting gutter to a toped car according to the present invention.

FIG. 2 is a schematic view showing a schematic plane of a dust collector around a hot metal drop portion from a tilting gutter to a toped car in FIG.

FIG. 3 is a schematic view showing a schematic plane of the dust collector around the molten pig iron drop portion when switching the speeded car in FIG.

FIG. 4 is a schematic view showing a schematic vertical cross section of a dust collector around a molten iron drop portion from a tilting gutter to a toped car according to another embodiment of the present invention.

FIG. 5 is a schematic view showing a schematic vertical cross-sectional view of a dust collector around a molten iron drop portion from a tilting gutter to a toped car according to another embodiment of the present invention.

FIG. 6 is a perspective view showing a generation principle of an artificial tornado according to the present invention.

FIG. 7 is a schematic view showing in plan view a state in which a swirling air flow is formed by the blowing head according to the present invention.

FIG. 8 is a schematic view showing a schematic vertical cross section of a dust collector around a molten iron drop portion from a tilting gutter to a toped car according to still another embodiment of the present invention.

FIG. 9 is an explanatory diagram showing a moving state of the mobile carriage in FIG. 8.

FIG. 10 is an explanatory diagram showing a moving state of the moving carriage in FIG. 8.

FIG. 11 is a schematic view showing a layout of a casting floor of a conventional blast furnace in a plan view.

FIG. 12 is a schematic view showing a schematic vertical cross-section of a conventional dust collector around a hot metal drop portion from a tilt gutter to a toped car.

FIG. 13 is a schematic diagram showing a schematic vertical cross section of the dust collector around the hot metal falling portion when switching the speeded car in FIG. 12.

FIG. 14 is a schematic diagram showing a schematic vertical cross section of a dust collector around a hot metal drop portion from a tilting gutter to a toped car according to another embodiment of the related art.

[Explanation of symbols]

 1 blast furnace 2 furnace body 3 taphole 4 opener 5 tappig 6 skinma 7 hot metal gutter 8 melt gutter 9 desiliconization driving lance 10 tilt pouring (molten metal) 11 topped car 12 tilt pouring ladle (slag) 13 14 Mud gun 15 Tilt device 16 Dust collection hood 17 Suction duct 18 Lower end opening 19 Suction port 20 Receiving port 21 Gas blowing head 22 Swirling gas nozzle 23 Weight 24 Casting floor 25 Monitoring window opening 26 Dust generation 27 Suction flow 28 Pulley 29 Wire 30 Nozzle for gas curtain 31 Gas curtain 32 Blower 33 Gas supply pipe 34 Switching valve 35 Flat plate for lid 36 Moving carriage 37 Wheel 38 Rail 39 Stopper

Claims (7)

[Claims] Claims: 1. Receptacles provided in two molten pig iron containers, which surround the tip of the tap gutter, the slant gutter directly below the tip and the molten material drop flow from the gutter, and which are located below the slant gutter. A method for collecting dust in a tilting gutter part of a blast furnace using a dust collection hood whose level is directly above the lower end opening, wherein a gas curtain nozzle is arranged inside each of the lower end openings provided in the dust collection hood. However, the two hot metal containers are for receiving pig iron or waiting for pig iron, and when present immediately below the corresponding lower end openings, substantially suspend gas injection from the gas curtain nozzle, When the hot metal container is absent immediately below the lower end opening due to replacement, gas is injected from the gas curtain nozzle to form a gas curtain, and suction is performed from the lower end opening corresponding to the hot metal container absent side. To cut off the flow Dust collection method for the tilting gutter of the blast furnace. 2. A tip of a taphole, a tilting gutter directly below the tip, and a molten material drop flow from the tilting gutter, and respective receiving ports provided in two molten pig iron containers located below the tilting gutter. A dust collecting method for a tilting gutter part of a blast furnace using a dust collecting hood whose level is directly above the lower end opening, wherein a gas curtain nozzle and a swirl are provided inside each of the lower end openings provided in the dust collecting hood. When a gas nozzle is arranged and the two hot metal containers are present immediately below the lower end opening for receiving pig iron or waiting for pig iron, the gas injection from the gas curtain nozzle is substantially interrupted and A suction gas connected to a suction duct connected to the dust collecting hood while forming a swirling gas flow in the dust collecting hood by the gas injected from the swirling gas nozzle arranged at the lower end opening corresponding to the hot metal container on the receiving side Artificial by suction into the mouth A tornado is generated to collect dust, and
When the hot metal container is absent immediately below the lower end opening due to replacement, gas is injected from the gas curtain nozzle to form a gas curtain, and suction is performed from the lower end opening corresponding to the hot metal container absent side. A method for collecting dust in a gutter of a blast furnace, which is characterized by blocking and suppressing a flow. 3. The dust collecting method for a tilting gutter of a blast furnace according to claim 2, wherein the gas curtain nozzles and the swirling gas nozzles have the same gas supply source. 4. The tilting gutter part of the blast furnace according to claim 1, wherein the gas injection from the gas curtain nozzle and the gas swirling nozzle is performed by using a switching signal of the tilting gutter. Dust collection method. 5. A receptacle for enclosing a tip portion of a taphole, a tilting gutter directly below the tip, and a molten material drop flow from the tilting gutter, and provided in two hot metal containers located below the tilting gutter. Is a dust collecting method for a tilting gutter part of a blast furnace using a dust collecting hood having the lower end opening at the level directly above, and a flat plate for a lid is horizontally arranged at a level substantially the same as the upper level of the receiving port of the pig iron container. The two movable carriages are movable between a closed position below the lower end opening provided in the dust collecting hood and a retracted position apart from below the lower end opening in association with each of the hot metal containers. When the two hot metal containers are present immediately below the lower end opening corresponding to each of the hot metal containers or the waiting for hot metal reception, the movable carriage is moved to the retracted position, and the lower end opening is placed. Is blocked by the receptacle of the hot metal container to block the suction flow However, when the molten pig iron container is absent, the movable carriage is moved to the closed position, and the lower end opening is closed by the flat plate for the lid to block the suction flow, thereby suppressing the suction flow. Dust collection method. 6. The movable carriage is arranged so as to be movable in the closing position direction by the gravity of the weight via wires hung on a plurality of pulleys arranged in the vicinity of the dust collection hood, and the movable carriage of the molten pig iron container. The dust collecting method for a tilting gutter of a blast furnace according to claim 5, wherein the dust collecting method is arranged so as to be movable in a retracted position direction when the blast furnace is moved to the pig iron receiving position. 7. The method for collecting dust in a tilting trough part of a blast furnace according to claim 1, wherein the tapping gutter and the molten pig iron container are a molten slag gutter and a molten slag container, respectively.