WO2011145145A1 - Dispositif de chargement de flux, dispositif de coulée continue, procédé de chargement de flux et procédé de coulée continue - Google Patents

Dispositif de chargement de flux, dispositif de coulée continue, procédé de chargement de flux et procédé de coulée continue Download PDF

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Publication number
WO2011145145A1
WO2011145145A1 PCT/JP2010/003396 JP2010003396W WO2011145145A1 WO 2011145145 A1 WO2011145145 A1 WO 2011145145A1 JP 2010003396 W JP2010003396 W JP 2010003396W WO 2011145145 A1 WO2011145145 A1 WO 2011145145A1
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WIPO (PCT)
Prior art keywords
flux
conveying
mold
supply pipe
hopper
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PCT/JP2010/003396
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English (en)
Japanese (ja)
Inventor
山條悟
山口俊喜
安光和典
本田尚久
繁永泰男
福永新一
Original Assignee
新日本製鐵株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 新日本製鐵株式会社 filed Critical 新日本製鐵株式会社
Priority to CN201080066696.8A priority Critical patent/CN102883837B/zh
Priority to BR112012029141-6A priority patent/BR112012029141A2/pt
Priority to JP2011535345A priority patent/JP4920801B2/ja
Priority to PCT/JP2010/003396 priority patent/WO2011145145A1/fr
Publication of WO2011145145A1 publication Critical patent/WO2011145145A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/108—Feeding additives, powders, or the like

Definitions

  • the present invention relates to a flux feeding device used when producing a slab while supplying a flux to a molten steel surface in a mold, and a continuous casting facility equipped with the flux feeding device. Furthermore, the present invention relates to a flux charging method for supplying a flux into a mold and a continuous casting method using the flux charging method.
  • Patent Document 1 includes a charging hopper for supplying powder, and a charging chute connected to the charging hopper, and an inclination obtained by adding an angle slightly added to the angle of repose of the powder to the charging chute.
  • Patent Document 2 discloses a powder feeding device including a turning chute for spraying powder into a mold and a movable tip chute provided at the tip of the turning chute and operable in the vertical vertical direction. ing. Furthermore, this powder feeding apparatus has a vibration mechanism, and can put powder into the mold without depending on the free fall. According to this powder charging device, the movable tip chute can be moved in the vertical vertical direction simultaneously with the turning of the turning chute, so that the powder can be stably supplied into the mold.
  • a storage hopper for storing granular powder (flux) is placed away from the periphery of a continuous casting mold (hereinafter also simply referred to as a mold) in order to secure a casting floor working space for a continuous casting facility. It is also practiced to supply granular powder into the mold through a plurality of conveying pipes installed and arranged in series from the storage hopper toward the mold. For example, in the casting powder supply apparatus disclosed in Patent Document 3, two transfer pipes are connected in series, and the transfer pipe and the transfer pipe and between the transfer pipes are connected to each other so as to be horizontally swivelable. is doing.
  • Patent Document 4 After stirring the powder cut out from the storage tank, this powder is pumped to the powder supply unit, and the powder is supplied to the spray nozzle that is branched into a plurality of powders.
  • An apparatus for supplying powder for continuous casting that recovers the powder remaining in the storage part to a storage tank is disclosed.
  • Patent Document 5 includes a powder storage hopper, a first storage container, a second storage container, and a mechanical feeder, and is detachable between the first storage container and the second storage container.
  • a powder supply device for continuous casting connected by a joint is disclosed.
  • Japanese Unexamined Patent Publication No. 2004-306060 Japanese Unexamined Patent Publication No. 2007-181845 Japanese Unexamined Patent Publication No. 11-28596 Japanese Laid-Open Patent Publication 1-1118350 Japanese Laid-Open Patent Publication No. 1-215449
  • Patent Documents 1 to 5 have the following problems to be solved. That is, in the apparatus described in Patent Document 1, only the tilt angle of the charging chute is specified, and the height range from the molten steel surface of the powder dropping start position is not specified. Therefore, since the speed at the time of collision of the molten steel surface of the powder increases as the height of the powder drop start position increases, if the temperature is too high, the fluctuation of the molten metal surface due to the collision of the powder with the molten steel surface will occur. May occur. In such a case, the product quality of the slab may be deteriorated due to fluctuations in the molten metal surface.
  • the powder in the turning chute is supplied into the mold using a vibration mechanism without using free fall of the powder.
  • an apparatus such as a vibration mechanism becomes an obstacle when an operator performs casting floor work, and the equipment cost is increased.
  • powder free fall is not used, it takes time to supply the powder into the mold, and there is a problem when it is necessary to quickly supply the powder to the molten metal surface in the mold.
  • a screw feeder is intermittently operated in a short time according to a casting condition.
  • the powder is bitten between the screw and the inner surface of the pipe in which the screw is built to be pulverized.
  • the melting characteristics of the powder change from the original state before powdering, and the inner surface of the mold becomes unstable, which may cause operational troubles. .
  • This invention is made in view of the said situation, Comprising: It aims at provision of the flux injection apparatus, the continuous casting installation, the flux injection method, and the continuous casting method which can improve the product quality of slab. .
  • a flux feeding device of the present invention includes a feeding hopper that temporarily stores flux; a supply pipe that is inclined so that the rear end is connected to the feeding hopper and the tip is located above the mold.
  • the height dimension H from the molten steel surface in the mold to the charging hopper is 0.5 m or more and 3.0 m or less; the minimum inclination with respect to the horizontal direction of the supply pipe
  • An angle ⁇ is 20 degrees or more; an angle ⁇ formed by an imaginary straight line connecting the discharge port of the flux of the charging hopper and a lower position of the tip of the supply pipe with respect to the horizontal direction is 54.6 ⁇ H ⁇ 0.5 degrees or less.
  • the supply pipe has a plurality of straight pipes connected to each other; among these straight pipes, the inclination angle of the smallest inclination angle with respect to the horizontal direction Is the minimum inclination angle ⁇ ; a configuration may be adopted.
  • the mold when the position of the tip of the supply pipe in the horizontal direction is based on the position of the inner wall surface of the mold at a position directly below the supply pipe, the mold It may be within a range from a position of 50 mm toward the inside of the mold to a position of 200 mm toward the outside of the mold.
  • the flux feeding device is a gas supply means for blowing gas into the supply pipe at a flow rate of more than 0 and not more than 3 liters / minute per 1 cm 2 of the flow path cross-sectional area in the supply pipe. May be further provided.
  • a continuous casting facility includes the flux feeding device according to any one of (1) to (4) above and the mold.
  • the casting speed of the slab by the mold may be 0.6 m / min or more.
  • the continuous casting facility includes a storage hopper that stores the flux; a transfer screw conveyor that transfers the flux from the storage hopper; and the transfer screw conveyor that has been transferred by the transfer screw conveyor A relay hopper for receiving the flux; a cutting screw conveyor provided between the relay hopper and the charging hopper; and a control device for controlling the operation of the conveying screw conveyor; and the cutting screw conveyor
  • the transport distance is shorter than the transport distance of the transport screw conveyor; the control device controls the transport amount by the transport screw conveyor to a predetermined transport amount or more for a predetermined time;
  • the conveying distance of the cutting screw conveyor may be 7 m or less.
  • the predetermined time is 2 minutes or more and 5 minutes or less; the predetermined conveyance amount is in a range of 1 kg / min or more and 20 kg / min or less. Also good.
  • the conveying screw conveyor includes a plurality of screw conveyors; and a connecting hopper disposed between the screw conveyors. You may employ
  • the flux charging method of the present invention is a method of supplying the flux to the molten steel surface in the mold by dropping the flux through the supply pipe arranged in an inclined manner, from the molten steel surface to the flux dropping start position.
  • the height dimension H is 0.5 m or more and 3.0 m or less; the minimum inclination angle ⁇ with respect to the horizontal direction of the supply pipe is set to 20 degrees or more; The angle ⁇ formed by the connecting virtual line with respect to the horizontal direction is set to 54.6 ⁇ H ⁇ 0.5 degrees or less.
  • the flux injection method according to (11) further includes a step of blowing a gas into the supply pipe at a flow rate of more than 0 and 3 liters / minute or less per 1 cm 2 of the flow path cross-sectional area in the supply pipe. You may prepare.
  • the continuous casting method of the present invention includes a step of supplying the flux to the molten steel surface in the mold using the flux charging method described in (11) or (12) above.
  • the casting speed of the slab by the mold may be 0.6 m / min or more.
  • the conveying distance of the cutting screw conveyor may be 7 m or less.
  • the predetermined time is 2 minutes or more and 5 minutes or less; the predetermined conveyance amount is in the range of 1 kg / min or more and 20 kg / min or less; You may do it.
  • the conveying screw conveyor includes a plurality of screw conveyors and a connecting hopper disposed between the screw conveyors; May be controlled individually.
  • the imaginary straight line connecting the height dimension H indicating the powder drop start position and the drop start position and the lower position of the tip of the supply pipe is in the horizontal direction. Since the angle ⁇ with respect to each other is determined within the optimum range, the speed at which the flux collides with the molten steel surface can be adjusted to a speed that does not cause a decrease in product quality due to molten metal surface fluctuation. . Further, since the minimum inclination angle ⁇ with respect to the horizontal direction of the supply pipe is set in the optimum range, clogging of the flux in the supply pipe can be prevented. As a result, flux can be supplied to the molten steel surface in the mold using an inexpensive supply pipe without obstructing the work, and fluctuations in the molten steel surface can be suppressed to further improve product quality. It becomes.
  • the supply pipe can be configured by connecting a plurality of straight pipes, so that the flux conveyance path can be changed according to the surrounding environment. Further, among the straight pipes, the inclination angle of the straight pipe having the smallest inclination angle with respect to the horizontal direction is set to the minimum inclination angle ⁇ , thereby preventing clogging of the flux in the supply pipe even when a plurality of straight pipes are used. it can.
  • the gas is supplied to the supply pipe by the gas supply means, so that the flux to the molten steel surface in the mold is supplemented. Can be more stably carried out.
  • the conveying screw conveyor disposed on the upstream side of the relay hopper is Depending on the amount of flux (for example, granular powder) in the relay hopper and the cutting screw conveyor arranged on the downstream side, the amount of flux conveyed can be individually adjusted according to the casting situation.
  • a predetermined amount of flux for example, granular powder
  • the flux pulverization rate increases.
  • the melting rate of the flux supplied into the mold becomes unstable, a non-uniform molten layer is formed on the surface of the molten steel, the formation of solidified shells cannot be promoted stably, and the operation is unstable. It was.
  • the conveying screw conveyor is operated at high speed in a short time and the conveying distance of the cutting screw conveyor is shorter than the conveying distance of the conveying screw conveyor, the extracting screw conveyor is made extremely short time. Even in the intermittent operation, it is possible to suppress the powdering of the flux supplied from the storage hopper into the mold. As a result, it is possible to achieve both prevention of flux powdering and stable supply. Therefore, stable casting can be carried out while maintaining the hatchability, lubricity and heat retention when the flux is supplied into the mold.
  • the powder pulverization rate due to the operation of the conveying screw conveyor can be further effectively improved. Can be reduced.
  • the powdering rate of the flux supplied into the mold is reduced to 15% by mass or less, the hatchability, lubricity and heat retention of the flux can be further improved.
  • the same effect as the flux charging device described in the above (1) can be obtained. That is, the height dimension H indicating the powder drop start position and the angle ⁇ formed by the horizontal direction of the imaginary straight line connecting the drop start position and the lower position of the tip of the supply pipe are determined in the optimum range. Can be adjusted to a speed at which there is no possibility of causing a decrease in product quality due to fluctuations in the molten metal surface. In addition, since the minimum inclination angle ⁇ with respect to the horizontal direction of the supply pipe is set in the optimum range, clogging of the flux in the supply pipe can be prevented. As a result, flux can be supplied to the molten steel surface in the mold using an inexpensive supply pipe without obstructing the work, and fluctuations in the molten steel surface can be suppressed to further improve product quality. It becomes.
  • the gas is supplied supplementarily, so that the flux can be more stably supplied to the molten steel surface in the mold. can do.
  • the screw conveyor for conveyance since a relay hopper is interposed between the screw conveyor for conveyance and the screw conveyor for cutting, the screw conveyor for conveyance disposed upstream of the relay hopper as a boundary.
  • the amount of flux for example, granular powder
  • the cutting screw conveyor arranged on the downstream side can individually adjust the amount of flux transported according to the progress of the casting operation.
  • a predetermined amount of flux for example, granular powder
  • the flux pulverization rate increases.
  • the melting rate of the flux supplied into the mold becomes unstable, a non-uniform molten layer is formed on the surface of the molten steel, the formation of solidified shells cannot be promoted stably, and the operation is unstable. It was.
  • the conveying screw conveyor is operated at high speed in a short time and the conveying distance of the cutting screw conveyor is shorter than the conveying distance of the conveying screw conveyor, the extracting screw conveyor is made extremely short time. Even in the intermittent operation, it is possible to suppress the powdering of the flux supplied from the storage hopper into the mold. As a result, it is possible to achieve both prevention of flux powdering and stable supply. Therefore, stable casting can be carried out while maintaining the hatchability, lubricity and heat retention when the flux is supplied into the mold.
  • the pulverization rate of the flux due to the operation of the conveying screw conveyor is further effective. Can be reduced.
  • the powdering rate of the flux supplied into the mold is reduced to 15% by mass or less, the hatchability, lubricity and heat retention of the flux can be further improved.
  • the angle ⁇ formed by the imaginary straight line connecting the flux drop start position and the lower position of the tip of the supply pipe with respect to the horizontal direction and the height dimension H from the molten steel surface at the drop start position are the amount of fluctuation in the melt surface. It is a graph which shows the influence which acts. It is a side view which shows the equipment arrangement
  • the continuous casting method using the flux charging method of the present embodiment is self-weighted through a cylindrical supply pipe 11 in which a flux (hereinafter, powder 10) is inclined obliquely downward. It is a method of producing a slab while dropping and supplying the molten steel on the molten steel surface 13 in the mold 12, and can suppress fluctuations in the molten steel surface with a simple configuration without obstructing work on the casting floor. It is a method that can improve the product quality of slabs.
  • a flux hereinafter, powder 10
  • the continuous casting equipment provided with the flux injection device of this embodiment for carrying out this continuous casting method is connected to the storage hopper 15 for storing the powder 10 and the lower end of the storage hopper 15 and directly below the vertical direction.
  • a transfer pipe 17 connected to the lower end of the down pipe 16 and extending in the horizontal direction, a flux feeding device 1 connected to the tip of the transfer pipe 17, and the flux A mold 12 for receiving the powder 10 from the charging apparatus 1, and a tundish 19 and an immersion nozzle 20 disposed above the mold 12 are provided.
  • the flux charging device 1 includes a powder charging hopper 18 that receives the powder 10 sent from the transfer pipe 17 and a supply pipe 11 that is connected to the lower end of the powder charging hopper 18 and is inclined.
  • the supply pipe 11 is inclined so that its rear end is connected to the powder charging hopper 18 and its front end is located above the interior of the mold 12.
  • the powder 10 used in the present embodiment includes a conventionally known powder, such as a hollow hollow powder having a space formed therein, a granular granular powder, and a powdered powder.
  • the powder 10 falls in the descending pipe 16 by its own weight, and is transferred to the powder charging hopper 18 by a transfer pipe 17 equipped with a screw feeder. Sent. Then, the powder is supplied from the lower end of the powder charging hopper 18 onto the molten steel surface 13 by its own weight through the supply pipe 11.
  • the supply pipe 11 is a pipe inclined from the lower end position of the powder charging hopper 18 toward the molten steel surface 13 and is premised on allowing the powder 10 to fall freely. Details of the configuration and arrangement of the supply pipe 11 will be described below.
  • the supply pipe 11 is configured by connecting a plurality of (four in this embodiment) straight pipes 21 to 24 in series, and is bent in multiple stages. More specifically, the supply pipe 11 is connected to the lower end of the powder charging hopper 18 and extends vertically downward, and is connected to the lower end of the straight pipe 21 and obliquely below. A straight pipe 22 inclined toward the straight line, a straight pipe 23 connected to the lower end of the straight pipe 22 and extending downward in the vertical direction, and connected to the lower end of the straight pipe 23 and to the mold 12 And a straight pipe 24 that is inclined toward the upper side of the molten steel surface 13 therein. Note that the number of straight pipes constituting the supply pipe 11 is not limited to the four pipes of the present embodiment. For example, two or three straight pipes may be used depending on the environmental conditions around the supply pipe 11. May be composed of 5 or more (the upper limit is, for example, about 10).
  • the minimum inclination angle ⁇ of the straight pipe 24 having the smallest inclination angle with respect to the horizontal direction is 20 degrees or more.
  • the minimum inclination angle ⁇ is less than 20 degrees, although there is a variation depending on the type of the powder 10, there is a high possibility that the powder 10 is clogged in the supply pipe 11.
  • tilt angle (alpha) is less than 20 degree
  • the case where the inclination angle of the straight pipe 24 located on the most downstream side constituting the supply pipe 11 is the inclination angle ⁇ has been described.
  • the supply pipe 11 is arranged on the most upstream side or in the intermediate portion.
  • the inclination angle of the straight pipe made may be the smallest, and this may be the minimum inclination angle ⁇ . This is because setting the minimum inclination angle ⁇ is intended to prevent clogging of the powder 10, and among the plurality of straight pipes 21 to 24, the minimum inclination of the straight pipe having the smallest inclination angle with respect to the horizontal direction. If the angle ⁇ is defined, the clogging of the powder 10 can be prevented without particularly defining other straight pipes.
  • the straight pipes constituting the supply pipe 11 include the straight pipes 21 and 23 arranged in the vertical direction, but without using these straight pipes 21 and 23, the inclination with respect to the horizontal direction You may use only the straight pipe in which the angle is 20 degrees or more and less than 90 degrees and is inclined.
  • the supply pipe 11 is not limited to a structure in which a plurality of straight pipes 21 to 24 are connected in series as in the present embodiment, but may be constituted by only a single straight pipe that forms a straight line ( (Not shown).
  • the inclination angle of the straight pipe with respect to the horizontal direction is the above-described minimum inclination angle ⁇ .
  • the supply pipe 11 is not limited to a straight pipe but may be composed of one or two or more curved pipes having an arc shape (not shown).
  • the minimum inclination angle ⁇ is represented by an angle formed by a tangent at the downstream end of the bending tube with respect to the horizontal direction.
  • the curved tube can also be used as a part of a plurality of straight tubes constituting the supply tube 11.
  • the supply pipe 11 described above has a height dimension H from the molten steel surface 13 (hereinafter simply referred to as the base end position of the supply pipe 11 connected to the powder charging hopper 18, that is, the drop start position H T of the powder 10. Height dimension H) is set in the range of 0.5 m or more and 3 m or less. Further, the angle in the feed pipe 11, the leading end bottom position of the drop starting position H T and the supply pipe 11 (hereinafter, the tip position P) and connecting the virtual straight line (two-dot chain line shown in FIG. 1) with respect to the horizontal direction ⁇ (hereinafter, also simply referred to as “the formed angle ⁇ ”) is set to be equal to or smaller than the angle obtained by 54.6 ⁇ H ⁇ 0.5 .
  • the relationship between the minimum inclination angle ⁇ and the angle ⁇ is such that the formed angle ⁇ is always greater than or equal to the minimum inclination angle ⁇ ( ⁇ ⁇ ⁇ ).
  • the angle ⁇ formed is too large, when the powder 10 is supplied into the mold 12, the powder powder rises when the powder 10 falls into the mold 12, and the work environment is deteriorated.
  • the present inventors have newly found out that there may be an increase in the fluctuation amount of the molten metal surface that leads to deterioration.
  • the hot metal surface collision speed V of powder needs to be 3.4 m / sec or less.
  • Case 1 the casting speed is 0.6 m / min or more
  • Case 2 the case where the casting speed is 0.3 to 0.5 m / minute
  • Case 2 the case 1
  • the effect of reducing the hot water surface collision speed was greater than in Case 2.
  • Case 1 shows a significant improvement over Case 2. Things were confirmed. Therefore, it was confirmed that the effect of this invention can be expressed more when the casting speed is 0.6 m / min or more.
  • variation amount can be suppressed to 5 mm or less, preferable slab quality can be maintained.
  • the height dimension h (see FIG. 2) of the supply pipe 11 at the tip position P from the molten steel surface 13 is adjusted within the range of 100 to 300 mm, the molten metal surface collision speed of the powder 10 is 3.4 m.
  • the result of investigating the relationship between the formed angle ⁇ and the height dimension H (see FIG. 1) so as to be equal to or less than 1 second will be described with reference to FIG.
  • the height dimension H was changed within the range of 0.5 m or more and 3 m or less.
  • 350 tons of molten steel per charge was cast for 2 charges, and the casting speed of the slab was 1.2 m / min.
  • FIG. 4 also shows the results of measuring the amount of fluctuation of the molten metal surface by using hollow powder and granular powder and changing the angle ⁇ and the height dimension H variously.
  • ⁇ indicates a result when the molten metal surface fluctuation amount is 5 mm or less
  • X indicates a result when the molten metal surface fluctuation amount exceeds 5 mm.
  • the measurement result of the molten metal level variation was in good agreement with the above calculation result.
  • the angle theta 54.6 ⁇ H -0 It was found that it was necessary to make it 5 degrees or less.
  • the lower limit of the height dimension H is preferably 1 m.
  • the formed angle ⁇ should be 50 ⁇ H ⁇ 0.5 degrees or less, and further, the formed angle ⁇ should be 45 ⁇ H ⁇ 0.5 degrees or less. preferable.
  • the tip position P is arranged so that the falling point of the powder 10 is in the mold 12.
  • the tip position P of the supply pipe 11 is 50 mm toward the molten steel surface 13 side (above the molten steel surface 13) with reference to the inner wall surface position F of the mold 12. It is preferable to be within the range from the position R1 to the position R2 of 200 mm outward from the mold 12.
  • the height dimension h from the molten steel surface 13 at the tip position P of the supply pipe 11 is preferably in the range of, for example, 100 mm or more and 300 mm or less.
  • the inner space of the mold 12 for producing a slab has a rectangular shape having a short side of about 250 mm and a long side of about 1000 mm when viewed in plan.
  • the tip position P of the supply pipe 11 when the tip position P of the supply pipe 11 is disposed at a position exceeding 50 mm toward the molten steel surface 13 side than the inner wall surface position F, a failure occurs in which the supply pipe 11 interferes with the immersion nozzle 20, Since a complicated control mechanism for avoiding this interference is required, it is not preferable.
  • the tip position P of the supply pipe 11 when the tip position P of the supply pipe 11 is disposed at a position exceeding 200 mm outward of the mold 12 from the inner wall surface position F, under conditions where the molten metal surface collision speed is 3.4 m / sec or less, the powder 10 cannot be reliably dropped into the mold 12. For this reason, the powder 10 will be scattered around the mold 12, which may cause clogging of the cooling nozzle (not shown) of the continuous casting machine arranged on the downstream side of the mold 12 and deterioration of the dust environment. is there.
  • the tip position P of the supply pipe 11 in the horizontal direction and the height direction may be determined by actually supplying the powder 10, but the speed of the powder 10 that has jumped out of the supply pipe 11 is determined by the equation of motion. Substitution may be performed for simulation, and determination may be made based on the result.
  • the powder 10 is basically charged by using its own weight, but a gas (for example, air) may be blown into the supply pipe 11 to assist the charging.
  • a gas for example, air
  • the gas flow rate is preferably more than 0 and 3 liters / minute or less per 1 cm 2 of the flow path cross-sectional area in the supply pipe 11.
  • auxiliary gas is blown into the supply pipe 11
  • clogging in the supply pipe 11 may occur depending on the type of powder used (for example, the state or particle size of hollow, granule, powder, etc.). Can be prevented. That is, by blowing gas into the supply pipe 11 in an auxiliary manner, the flow of the powder 10 in the supply pipe 11 can be promoted, and the powder 10 can be supplied into the mold 12 more stably.
  • the powder 10 was supplied by adjusting the angle ⁇ formed to 30 degrees, the height dimension H to 1 m, and adjusting the flow rate of the gas blown into the supply pipe 11 to 1, 2, and 3 liters / minute, respectively. However, no dust was generated and the powder 10 was not scattered around. However, when the flow rate of the gas blown into the supply pipe 11 was 4 liters / minute or more, the molten metal surface fluctuation amount increased, dust was generated, and the surrounding environment deteriorated. Thus, it is understood that when the gas exceeding 3 liters / minute per 1 cm 2 of the flow path cross-sectional area in the supply pipe 11 is blown into the supply pipe 11, the surrounding environment is deteriorated by the dust of the powder 10. It was.
  • the appropriate flow rate of the gas flowing in the supply pipe 11 is set to be more than 0 and 3 liters / minute or less per 1 cm 2 of the cross-sectional area in the supply pipe 11.
  • the proper flow rate of this gas is more preferably 1 liter / min at the lower limit and 2 liter / min at the upper limit.
  • the upper limit value is not specified, but the casting used in normal operation
  • the upper limit may be 3 m / min.
  • the lower limit of the casting speed of the slab has been set to 0.6 m / min. However, it is more preferably 0.8 m / min, and even more preferably 1.0 m / min.
  • the flux feeding device continuous casting equipment, flux feeding method, and continuous casting method of the present embodiment described above, it is possible to change the molten steel surface level of the molten steel with a simple configuration and method without obstructing the casting floor operation. While being suppressed, the powder 10 can be supplied to the molten steel surface, and the product quality of the slab can be improved.
  • the continuous casting equipment of this embodiment includes a transfer device 110 for continuous casting mold powder, and a control device (not shown) that controls the operation of the transfer screw feeder 118 and the like of the transfer device 110.
  • the mold 12 is provided.
  • a flux feeding device using the flux feeding method according to the present embodiment, a continuous casting facility equipped with the flux feeding device, and a continuous casting method using the continuous casting facility will be described below.
  • a continuous casting mold powder conveying device 110 is a granular powder (flux) conveying direction used in a continuous casting method using a continuous casting facility.
  • An example of a screw conveyor for use) 116 and a turning device 117 which is a flux feeding device of this embodiment are provided in this order.
  • the two screw feeders 112 and 114 located on the upstream side of the relay hopper 115 constitute a conveying screw feeder (an example of a conveying screw conveyor) 118.
  • the screw feeders 112 and 114 and the cutting screw feeder 116 have the same inner diameter dimensions and screw (not shown) configurations of their conveying pipes, but may be different.
  • the storage hopper 111 stores granular powder.
  • an upstream end portion of the screw feeder 112 is attached so as to be inclined obliquely upward from the lower end portion.
  • the screw feeder 112 conveys the granular powder in the storage hopper 111 obliquely upward and passes through the connecting hopper 113.
  • the granular powder that has passed through the connecting hopper 113 is conveyed to the relay hopper 115 by the screw feeder 114.
  • the connecting hopper 113 has only a function of allowing the granular powder to pass therethrough, but may have a function of temporarily storing the granular powder.
  • connection hopper 113 the operation of the adjacent screw feeders 112 and 114 can be controlled separately with the connection hopper 113 as a boundary.
  • the case where the two screw feeders 112 and 114 are disposed between the storage hopper 111 and the relay hopper 115 has been described.
  • the storage hopper 111 and the relay hopper 115 may be directly connected by a transfer screw feeder (an example of a transfer screw conveyor) 119. More specifically, the upstream end of one transfer screw feeder 119 is connected to the lower end of the storage hopper 111, and the downstream end of this transfer screw feeder 119 is connected to the relay hopper 115. .
  • the relay hopper 115 temporarily stores granular powder.
  • a level meter (not shown) is installed in the relay hopper 115 and the amount of granular powder stored in the relay hopper 115 can be measured.
  • the upstream screw feeders 112 and 114 can be used in accordance with the amount of granular powder in the relay hopper 115 (that is, before the amount of granular powder stored falls below a preset lower limit value).
  • the granular powder in the storage hopper 111 can be conveyed into the relay hopper 115.
  • the cutting screw feeder 116 on the downstream side of the relay hopper 115 can convey the granular powder into the mold 12 by a predetermined amount according to the progress of the casting operation.
  • the swivel device 117 is provided with the charging hopper 120 to which the granular powder is supplied by the cutting screw feeder 116, and the granular powder supplied to the charging hopper 120 is disposed obliquely downward from the lower portion of the charging hopper 120. It has a charging chute 121 which is a supply pipe that is freely dropped by its own weight and is supplied to the molten steel surface 13 in the mold 12. Since the charging chute 121 is bent in an L shape when viewed from the side, the connecting portion of the charging chute 121 with the charging hopper 120 is rotated around an axis along the vertical direction, thereby forming a granular shape. Powder can be sprayed on the molten steel surface 13 in the mold 12 in an arc shape.
  • the distance from the storage hopper 111 to the upper end of the mold 12 is, for example, 7 m or more and 30 m or less.
  • the distance is less than 7 m, it is not possible to secure a sufficient working space for the cast floor in which the mold 12 is installed.
  • the distance exceeds 30 m, the powdering rate of the granular powder rapidly increases when the granular powder is conveyed remotely using each screw feeder. Therefore, the distance is preferably 7 m or more and 30 m or less.
  • the charging chute 121 is disposed on the molten steel surface 13 in the mold 12 in substantially the same manner as the supply pipe 11 of the first embodiment. That is, the height dimension H from the molten steel surface 13 in the mold 12 to the charging hopper 120 is 0.5 m or more and 3.0 m or less; the minimum inclination angle ⁇ with respect to the horizontal direction of the charging chute 121 is 20 degrees or more. The angle ⁇ formed by the imaginary straight line connecting the granular powder discharge port of the charging hopper 120 and the lower position of the tip of the charging chute 121 with respect to the horizontal direction is 54.6 ⁇ H ⁇ 0.5 degrees or less. Yes. Further, in the present embodiment, the tilt angle of the charging chute 121 is the minimum tilt angle ⁇ .
  • the granular powder used for continuous casting is conveyed from the storage hopper 111 to the relay hopper 115 via the conveying screw feeder 118, the connecting hopper 113, and the screw feeder 114. Further, from the relay hopper 115, a predetermined amount is supplied into the mold 12 through the cutting screw feeder 116, the charging hopper 120, and the charging chute 121. Under the present circumstances, according to the flux injection
  • the granular powder is, for example, a hollow one having a space formed therein, and has an average particle size of about 200 ⁇ m to 400 ⁇ m (further, the lower limit is 250 ⁇ m and the upper limit is 350 ⁇ m).
  • the granular powder used in the present embodiment includes conventionally known powders such as hollow ones having a space formed therein and granular ones, but only powder powders are excluded.
  • the granular powder is conveyed from the storage hopper 111 to the relay hopper 115 by sequentially operating the screw feeder 114 and the screw feeder 112 that constitute the conveying screw feeder 118 on the upstream side of the relay hopper 115.
  • This conveyance is automatically performed when the level meter provided in the relay hopper 115 detects that the amount of granular powder stored in the relay hopper 115 is below a preset lower limit value. Is called.
  • the storage amount of the granular powder in the relay hopper 115 can be automatically recovered.
  • the granular powder in the relay hopper 115 is conveyed to the charging hopper 120. This conveyance is performed according to the progress of the casting operation. Thereby, by rotating the charging chute 121 about the axis along the vertical direction of the charging hopper 120, the granular powder can be uniformly distributed from the charging hopper 120 through the charging chute 121 into the mold 12. .
  • the conveying screw feeder 118 that conveys the granular powder to the relay hopper 115 operates only when the storage amount of the granular powder in the relay hopper 115 decreases. For this reason, after the conveyance of the granular powder to the relay hopper 115 is completed, the time interval until the next granular powder is conveyed to the relay hopper 115 is long, and the operation rate of each screw feeder 112, 114 is low (hereinafter referred to as the operation rate). Also called low operation).
  • the cutting screw feeder 116 for conveying the granular powder to the charging hopper 120 is operated according to the progress of the casting operation. For this reason, it is necessary to carry out and stop the granular powder frequently and intermittently in a short time, and the operation rate of the cutting screw feeder 116 is extremely high (hereinafter also referred to as high operation).
  • the operation method of the conveying screw feeder 118 and the cutting screw feeder 116 can be changed with the relay hopper 115 as a boundary.
  • the low-operation conveying screw feeder 118 is, for example, once at a time interval of 10 minutes or more and 30 minutes or less, for a short time operation of 2 minutes or more and 5 minutes or less (that is, continuous operation),
  • high-speed operation can be performed in which the amount of granular powder conveyed is, for example, 1 kg or more and 20 kg or less per minute.
  • the cutting screw feeder 116 for high operation is, for example, once in a time interval of 10 seconds or more and 1 minute or less, and in an extremely short time operation (that is, intermittent operation) of 10 seconds or more and 1 minute or less, A low speed operation can be performed in which the amount of granular powder conveyed is, for example, 0.1 kg or more and 3 kg or less per minute and less than the conveying amount of the conveying screw feeder 118.
  • FIG. 7 shows the results of investigation on two operation modes, a continuous operation mode in which granular powder is continuously conveyed and an intermittent operation mode in which granular powder is intermittently conveyed in an extremely short time.
  • the rotation speed of the screw of the screw feeder in each investigated operation mode is two, 90 rpm (rotation number / min) and 400 rpm.
  • the powdering rate of the granular powder shown in FIG. 7 is obtained by applying the granular powder after conveyance to a sieve having a finer mesh than the average particle diameter of the granular powder before conveyance.
  • the weight of the granular powder (that is, powdered granular powder) was measured, and this measured value was obtained by dividing by the weight of the total granular powder conveyed.
  • a sieve having a sieve mesh size of 70% or less (here, 210 ⁇ m) of the average particle diameter of the granular powder was used.
  • the powdering rate of the granular powder tended to increase gently as the conveying distance of the granular powder increased.
  • the powdering rate has also fluctuated somewhat by changing the rotation speed of the screw, it can be suppressed to 10% by mass or less at which stable casting can be performed.
  • the screw feeder was operated intermittently, the powdering rate of the granular powder tended to increase rapidly as the conveying distance of the granular powder increased.
  • the increase speed of the powdering rate is increasing more rapidly by increasing the rotation speed of the screw. From the above, it has been found that when the screw feeder is intermittently operated in an extremely short time, the powdering rate of the granular powder is increased and stable casting may not be performed.
  • the conveying distance of the cutting screw feeder 116 is made shorter than the conveying distance of the conveying screw feeder 118 (the total conveying distance of the screw feeders 112 and 114).
  • the powdering rate of the granular powder also decreases rapidly, so the lower limit is not specified, but considering the securing of the work space, etc.
  • About 2 m (or 3 m) can be used as the shortest length.
  • FIG. 8 shows an operation method of each of the screw feeders 112 and 114 constituting the conveying screw feeder 118 shown in FIG. 5 and an operation method of the cutting screw feeder 116.
  • the total conveying distance of the screw feeders 112 and 114 disposed between the storage hopper 111 and the relay hopper 115 is 6 m
  • the cutting screw feeder 116 disposed between the relay hopper 115 and the charging hopper 120 is used.
  • the transport distance was 4 m.
  • the conveying distance of the cutting screw feeder 116 is shorter than the conveying distance of the conveying screw feeder 118.
  • the operation of the conveying screw feeder 118 between the storage hopper 111 and the relay hopper 115 is set to a low operation (that is, to function as a low operation feeder). Specifically, continuous operation in which the screw was rotated at a rotation speed of 400 rpm for 3 minutes was performed at 25 minute intervals. The amount of granular powder transported at this time was 20 kg in 3 minutes.
  • the cutting screw feeder 116 between the relay hopper 115 and the feeding hopper 120 was set to high operation (that is, functioned as a high operation feeder). Specifically, continuous operation in which the screw was rotated at a rotation speed of 90 rpm for 30 to 40 seconds was intermittently performed at intervals of 30 to 40 seconds. The amount of granular powder conveyed at this time was about 1 kg per time.
  • FIG. 9 one screw feeder (conveyance distance: 10 m) is arranged between the storage hopper 111 and the charging hopper 120 without providing the relay hopper 115, and the screw is rotated at a rotation speed of 90 rpm.
  • the results of a comparative example in which a short-time operation of rotating for 40 seconds is intermittently performed at intervals of 30-40 seconds are also shown. Since the average particle diameter of the granular powder before conveyance was about 300 ⁇ m, the powdering rate here was determined using a sieve having a sieve mesh size of 210 ⁇ m. As is apparent from FIG.
  • the powder pulverization of the granular powder is performed by changing the operation method of the transfer screw feeder 118 provided on the upstream side of the relay hopper 115 and the cutting screw feeder 116 provided on the downstream side. It was confirmed that the rate could be suppressed to the target value of 15% by mass or less. In the comparative example, the powdering rate increased to about 30% by mass.
  • the continuous casting method of this embodiment it has confirmed that powdering of granular powder could be suppressed.
  • the granular powder can stabilize the melting rate in the mold 12, and a uniform molten layer is formed on the molten steel surface 13 to flow between the inner wall surface of the mold 12 and the solidified shell. Since the formation of the shell can be promoted stably, casting can be carried out stably. Therefore, it is possible to achieve both stable prevention and stable supply of granular powder, and stable casting. As a result, the product quality of the slab can be improved.
  • the present invention is not limited only to the configuration described in each of the above embodiments, and includes other embodiments and modifications.
  • a case where the present invention is configured by combining some or all of the above embodiments and modifications is also included in the scope of the right of the present invention.
  • the conveying screw feeder 118 arranged between the storage hopper 111 and the relay hopper 115 is constituted by two screw feeders 112 and 114 arranged in series. You may comprise not only this structure but 3 or more (10 or less realistically) screw feeders arranged in series. In this case, it is preferable to provide a connecting hopper that connects the downstream end and the upstream end of each screw feeder between adjacent screw feeders.
  • a flux feeding device it is possible to provide a flux feeding device, a continuous casting facility, a flux feeding method, and a continuous casting method that can improve the product quality of the slab.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

Un dispositif de chargement de flux est pourvu d'une trémie de chargement destinée à stocker provisoirement un flux, et également d'un tuyau d'alimentation disposé dans une position inclinée d'une manière telle que l'extrémité arrière de celui-ci soit reliée à la trémie de chargement et que l'extrémité avant de celui-ci se situe au-dessus de l'intérieur d'un moule. La hauteur (H) depuis la surface d'acier en fusion contenu dans le moule à la trémie de chargement est comprise entre 0,5 m et 3,0 m, inclus, l'angle d'inclinaison minimum (α) du tuyau d'alimentation par rapport à la direction horizontale est de 20 degrés ou plus, et l'angle (θ) d'une ligne rectiligne imaginaire reliant l'ouverture de sortie de flux de la trémie de chargement et la partie inférieure de l'extrémité avant du tuyau d'alimentation par rapport à la direction horizontale est de 54,6 x H-0.5 degrés ou moins.
PCT/JP2010/003396 2010-05-20 2010-05-20 Dispositif de chargement de flux, dispositif de coulée continue, procédé de chargement de flux et procédé de coulée continue WO2011145145A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN201080066696.8A CN102883837B (zh) 2010-05-20 2010-05-20 熔剂投入装置、连续铸造设备、熔剂投入方法和连续铸造方法
BR112012029141-6A BR112012029141A2 (pt) 2010-05-20 2010-05-20 aparelho de carregamento de fluxo, equipamento de fundição contínua, método de carregamento de fluxo e método de fundição contínua
JP2011535345A JP4920801B2 (ja) 2010-05-20 2010-05-20 フラックス投入装置、連続鋳造設備、フラックス投入方法、及び連続鋳造方法
PCT/JP2010/003396 WO2011145145A1 (fr) 2010-05-20 2010-05-20 Dispositif de chargement de flux, dispositif de coulée continue, procédé de chargement de flux et procédé de coulée continue

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PCT/JP2010/003396 WO2011145145A1 (fr) 2010-05-20 2010-05-20 Dispositif de chargement de flux, dispositif de coulée continue, procédé de chargement de flux et procédé de coulée continue

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JP2014083575A (ja) * 2012-10-25 2014-05-12 Kobe Steel Ltd 連続鋳造鋳型内へのモールドフラックスの添加方法
CN106424680A (zh) * 2016-08-30 2017-02-22 湖北立晋钢铁集团有限公司 一种方坯浇钢操作工艺流程

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CN105057615B (zh) * 2015-07-30 2017-04-12 江苏永钢集团有限公司 结晶器保护渣添加装置
GB201517130D0 (en) * 2015-09-28 2015-11-11 Imerys S A A flux feeding apparatus and method

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JP2004306060A (ja) * 2003-04-04 2004-11-04 Nippon Steel Metal Prod Co Ltd 連続鋳造用パウダー投入装置

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JP2004306060A (ja) * 2003-04-04 2004-11-04 Nippon Steel Metal Prod Co Ltd 連続鋳造用パウダー投入装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014083575A (ja) * 2012-10-25 2014-05-12 Kobe Steel Ltd 連続鋳造鋳型内へのモールドフラックスの添加方法
CN106424680A (zh) * 2016-08-30 2017-02-22 湖北立晋钢铁集团有限公司 一种方坯浇钢操作工艺流程

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CN102883837B (zh) 2015-03-18
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CN102883837A (zh) 2013-01-16
BR112012029141A2 (pt) 2021-08-03

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