WO2024018916A1 - 粒鉄製造装置及び粒鉄製造方法 - Google Patents

粒鉄製造装置及び粒鉄製造方法 Download PDF

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Publication number
WO2024018916A1
WO2024018916A1 PCT/JP2023/025176 JP2023025176W WO2024018916A1 WO 2024018916 A1 WO2024018916 A1 WO 2024018916A1 JP 2023025176 W JP2023025176 W JP 2023025176W WO 2024018916 A1 WO2024018916 A1 WO 2024018916A1
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WIPO (PCT)
Prior art keywords
cooling water
pipe group
water pipe
cylinder
iron
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2023/025176
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English (en)
French (fr)
Japanese (ja)
Inventor
雄大 土田
俊介 森
聡志 川畑
有仁 松永
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JFE Steel Corp
Original Assignee
JFE Steel Corp
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Filing date
Publication date
Application filed by JFE Steel Corp filed Critical JFE Steel Corp
Priority to JP2023578819A priority Critical patent/JP7468820B1/ja
Priority to US18/994,386 priority patent/US20260027620A1/en
Priority to KR1020257001253A priority patent/KR20250024067A/ko
Priority to CN202380052439.6A priority patent/CN119497652A/zh
Priority to EP23842841.1A priority patent/EP4520461A4/en
Publication of WO2024018916A1 publication Critical patent/WO2024018916A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/05—Metallic powder characterised by the size or surface area of the particles
    • B22F1/054—Nanosized particles
    • B22F1/0551—Flake form nanoparticles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F2009/0804—Dispersion in or on liquid, other than with sieves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F2009/0804—Dispersion in or on liquid, other than with sieves
    • B22F2009/0808—Mechanical dispersion of melt, e.g. by sieves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
    • B22F2009/086—Cooling after atomisation
    • B22F2009/0872—Cooling after atomisation by water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
    • B22F2009/0896—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid particle transport, separation: process and apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2301/00—Metallic composition of the powder or its coating
    • B22F2301/35—Iron

Definitions

  • the present invention relates to a granulated iron manufacturing apparatus and a granulated iron manufacturing method for manufacturing granulated iron from molten iron.
  • Granular iron is made by dispersing molten iron such as hot metal or molten steel and then solidifying it into granules, with an average particle size of about several mm to several tens of mm.
  • molten iron such as hot metal or molten steel
  • this is temporarily stored as granular pig iron.
  • blast furnaces have become larger, and if a large amount of hot metal cannot be temporarily processed, the blast furnace wind will be reduced. For this reason, there is a need for equipment that can serve as a buffer in case troubles occur in the steelmaking process and below.
  • Patent Document 1 discloses a method of granulating hot metal by spraying pressure water on the hot metal.
  • the granular pig iron is often hollow, and there is a risk that water will accumulate in this hollow part and cause a steam explosion during remelting.
  • Patent Document 2 discloses a granular metal manufacturing method in which molten pig iron is dropped onto a fixed plate, droplets bounce off the fixed plate, fall into a cooling bath below, and are cooled, thereby producing granular pig iron.
  • Patent Document 3 discloses an apparatus for producing a large amount of granular pig iron by granulating hot metal with a water stream, cooling and solidifying the liquid granular pig iron by dropping it into water.
  • Granular pig iron is at a high temperature when it is put into water.
  • the temperature of granular pig iron is approximately 1200 to 1500 degrees Celsius, so when such high-temperature granular pig iron comes into contact with water, a film boiling state occurs in which a steam film is created on the surface of the hot object, and the water evaporates, dissipating the heat of the granular pig iron. I'll take it away.
  • This film boiling has a low cooling capacity, and has a heat transfer coefficient that is only about one hundredth of that of nucleate boiling, which does not produce a vapor film, for example. For this reason, if film boiling continues for a long time, the granular pig iron may not be sufficiently cooled, and the granular pig pigs may fuse and coalesce within the cooling water.
  • Patent Document 3 discloses that the amount of secondary cooling water is adjusted to maintain the cooling water temperature in the pit at 68°C or less, thereby suppressing the coalescence of granular pig iron deposited in the pit. He says it can be done.
  • the cooling water tank is provided with a discharge port for supplying cooling water and a drain port for conveying the cooled water whose temperature has increased to the cooling equipment, thereby circulating the cooling water between the cooling water tank and the cooling equipment.
  • Patent Document 3 describes that the cooling water temperature in the pit is maintained at 68° C. or lower by adjusting the amount of cooling water of the secondary cooling water, but there is no mention of a method for controlling the flow in the cooling water tank. Depending on the flow of cooling water, a stagnation area may occur in the cooling water tank. Warm cooling water used for cooling the granular pig iron may remain in this stagnation area, resulting in the formation of a locally high water temperature area.
  • the present invention has been made to solve the above problems, and its purpose is to provide a granular iron manufacturing apparatus and a granular iron manufacturing method that can efficiently cool molten iron and suppress coalescence of granular iron. That's true.
  • a granulated iron manufacturing apparatus having a granulating device that turns molten iron into droplets, and a cooling water tank that cools the droplets by dropping them into cooling water, the device being installed in the cooling water tank, and having upper and lower ends.
  • the water flow control container has an open water flow control container and a group of cooling water pipes that supply cooling water into the water flow control container, and the water flow control container has an inclined surface such that a horizontal cross-sectional area becomes narrower toward the bottom.
  • the cooling water pipe group includes a partition cylinder and a duct cylinder connected below the partition cylinder, and the cooling water pipe group includes an upper cooling water pipe group and a middle cooling water pipe group connected to the partition cylinder, and the duct cylinder. and a lower cooling water pipe group connected to the body, and the upper cooling water pipe group is connected to the upper stage of the inclined surface including the upper end of the partition cylinder body, and the upper cooling water pipe group is connected to the upper stage of the inclined surface including the upper end of the partition cylinder body, and the upper cooling water pipe group is The middle cooling water pipe group is connected horizontally to the middle stage of the inclined surface of the partition cylinder toward the cylinder core of the partition cylinder, and the middle cooling water pipe group is connected horizontally to the middle stage of the slope of the partition cylinder, and The cooling water supplied from the water tube group moves toward the cylinder core of the partition cylinder, merges at the cylinder core, rises, and flows inside the partition cylinder with a flow of cooling water along the slope from above to below.
  • a first circulating flow is generated, and the lower cooling water pipe group is connected to the side surface of the duct cylinder, and the lower cooling water pipe group is connected to the side surface of the duct cylinder, and the cooling water supplied from the lower cooling water pipe group and the drainage from the partition cylinder
  • a granular iron production device that generates a second circulation flow that circulates within a duct cylinder.
  • a control device that controls the amount of cooling water supplied from the cooling water pipe group to the water flow control container, and the control device controls the amount of cooling water supplied from the cooling water pipe group to the middle cooling water pipe group,
  • the granulated iron manufacturing apparatus according to [1] or [2], wherein the upper cooling water pipe group is controlled to decrease in the order of the lower cooling water pipe group.
  • [8] A method for manufacturing granulated iron using the granulated iron manufacturing apparatus according to any one of [1] to [7], wherein the amount of cooling water supplied from the cooling water pipe group is equal to that of the middle cooling water pipe group, the upper cooling water pipe group, A method of manufacturing granulated iron that reduces the number of cooling water pipes in the order of first and then the lower cooling water pipe group.
  • a first circulation flow of cooling water is generated in the partition cylinder from below to above, and a second circulation flow of cooling water is generated in the duct cylinder from below to above.
  • the circulating flow cools the granulated iron. This increases the cooling efficiency of the granulated iron in the partition cylinder, and suppresses the fusion and coalescence of granulated iron during cooling of the granulated iron. Furthermore, by increasing the cooling efficiency of granulated iron, the device becomes more compact if the cooling capacity of granulated iron is kept the same, and the device can produce more granulated iron if the size of the device is the same.
  • FIG. 1 is a schematic cross-sectional view of a granulated iron manufacturing apparatus according to this embodiment.
  • FIG. 2 is a schematic cross-sectional view of the water flow control container at a portion where the cooling water pipe group is connected.
  • FIG. 3 is a schematic cross-sectional view illustrating the circulation flow generated within the partition cylinder and the duct cylinder.
  • FIG. 4 is a schematic cross-sectional view showing another water flow control container used in the granulated iron manufacturing apparatus according to the present embodiment.
  • FIG. 5 is a schematic diagram of a water supply port provided with a protrusion viewed from the horizontal direction.
  • FIG. 6 is a schematic cross-sectional view showing another water flow control container used in the granulated iron production apparatus according to the present embodiment.
  • FIG. 1 is a schematic cross-sectional view of a granulated iron manufacturing apparatus according to this embodiment.
  • FIG. 2 is a schematic cross-sectional view of the water flow control container at a portion where the cooling water pipe group is
  • FIG. 7 is a schematic diagram of a water supply port provided with a protective cover, viewed from the horizontal direction.
  • FIG. 8 is a diagram showing simulation conditions for Invention Example 1 and Invention Example 2.
  • FIG. 9 is a diagram showing simulation conditions for Comparative Example 1 and Comparative Example 2.
  • FIG. 10 is a diagram showing simulation results of Invention Example 1 and Invention Example 2.
  • FIG. 11 is a schematic perspective view showing the flow of cooling water supplied from each cooling water pipe group in Invention Example 1.
  • FIG. 12 is a diagram showing simulation results of Comparative Example 1 and Comparative Example 2.
  • FIG. 13 is a diagram showing the results of checking whether or not granulated iron has entered the water supply port.
  • FIG. 1 is a schematic cross-sectional view of a granulated iron manufacturing apparatus 70 according to this embodiment.
  • the granulated iron production apparatus 70 is an apparatus that produces granulated iron, which is a granular iron material, by cooling and solidifying molten iron such as hot metal or molten steel into droplets.
  • the granulated iron manufacturing device 70 includes a granulating device 10 that turns molten iron into droplets, a cooling water tank 20, a water flow control container 30, a cooling water pipe group 40, and a conveying device 50.
  • the granulating device 10 stores molten iron 60 and collides a tundish 12 (such as a molten pig iron bucket) with a molten iron discharge nozzle 16 at the bottom, and a liquid column 62 of molten iron discharged from the nozzle 16 and flowing down. It has a receiving board 14.
  • the molten iron receiving plate 14 is made of a disc-shaped refractory and is supported by a support 18 .
  • the liquid column 62 of molten iron flowing down from the nozzle 16 collides with the molten iron receiving plate 14, and droplets 64 of the molten iron 60 are scattered around it.
  • the granulating device 10 converts the molten iron 60 into droplets 64 such that the maximum length of the granulated iron 66 after cooling is 50 mm or less.
  • the molten iron 60 is turned into droplets 64 by the granulating device 10 and falls into the cooling water 24 . Further, in the granulating device 10, the amount of molten iron 60 flowing down from the tundish 12 is controlled so that the droplets 64 fall into the area where the water flow control container 30 is provided.
  • the cooling water tank 20 accommodates cooling water 24 and a water flow control container 30.
  • the water flow control container 30 is installed in the cooling water 24 contained in the cooling water tank 20.
  • the cooling water 24 accommodated in the cooling water tank 20 may include the cooling water 24 drained from the water flow control container 30.
  • the same amount of cooling water 24 contained in the cooling water tank 20 as the amount of cooling water supplied is drained from the drain port 22 so that the cooling water level in the cooling water tank 20 is constant.
  • the large-capacity cooling water tank 20 it becomes easy to control the cooling water level, and the production of granulated iron by the granulated iron manufacturing apparatus 70 is stabilized.
  • the water flow control container 30 is provided in the cooling water tank 20 and is provided at a position to receive the molten iron made into droplets by the granulator 10.
  • the water flow control container 30 cools and solidifies the droplets with the cooling water 24 stored therein to form granulated iron 66.
  • the water flow control container 30 includes a partition cylinder 32 having an inclined surface 34 whose horizontal cross-sectional area narrows downwardly, and a duct cylinder 35 connected below the partition cylinder 32.
  • An input port 33 for receiving droplets 64 is provided at the upper end of the partition cylinder 32, and an outlet 36 for discharging granulated iron is provided at the lower end of the duct cylinder 35. That is, the water flow control container 30 is open at its upper and lower ends.
  • the inclined surface 34 may be formed on the inside of the water flow control container 30, and the shape of the outside of the water flow control container 30 is not particularly limited.
  • the angle of inclination of the inclined surface 34 is preferably within the range of 40 to 60 degrees from the viewpoint of not allowing the granulated iron 66 to remain. Further, in the example shown in FIG. 1, the water flow control container 30 does not have a cylindrical portion on the upper end side, but the water flow control container 30 may have a cylindrical portion on the upper end side.
  • the cooling area of the granulated iron 66 formed by the water flow control container 30 is referred to as the cooling area A.
  • the reason for providing the cooling area A formed by the water flow control container 30 in this way is to obtain the following two effects. (1) By introducing the cooling water 24 into the cooling area A in a concentrated manner, the iron granules 66 can be efficiently cooled. (2) Since the granulated iron 66 generated within the partition cylinder 32 can be collected in one place on the inclined surface 34, the granulated iron 66 can be easily recovered.
  • the cooling water pipe group 40 is a water pipe group through which the cooling water 24 cooled to 0° C. or more and 35° C. or less by cooling equipment such as a heat exchanger or a cooling tower (not shown) passes through.
  • cooling equipment such as a heat exchanger or a cooling tower (not shown)
  • a first circulating flow is generated with a cooling water flow that does not flow out from the input port 33 into the cooling water tank 20 but expands in the circumferential direction near the input port 33 and descends the inclined surface 34 of the partition cylinder 32.
  • the cooling water pipe group 40 includes an upper cooling water pipe group 44 and a middle cooling water pipe group 46 connected to the partition cylinder, and a lower cooling water pipe group 48 connected to the duct cylinder 35.
  • the middle stage cooling water pipe group 46 is connected horizontally to the middle stage of the inclined surface 34 in the range from the vertical center of the partition cylinder 32 to 650 mm below, toward the cylinder core of the partition cylinder 32.
  • the cooling water 24 heads toward the cylinder core of the partition cylinder 32, joins at the cylinder core, and rises.
  • the cooling water 24 that merges at the cylinder core and rises spreads in the circumferential direction at the upper end of the partition cylinder 32 and flows downward along the inclined surface 34, forming a first circulating flow.
  • the cooling water 24 supplied from the middle cooling water pipe group 46 forms part of the first circulating flow.
  • the amount of cooling water supplied from the middle cooling water pipe group 46 is preferably 1500 m 3 /h or more and 3900 m 3 /h or less. If the amount of cooling water is less than 1500 m 3 /h, it is not preferable because it becomes difficult to generate a strong and stable upward flow in the cylinder core of the partition cylinder 32. Moreover, if the amount of cooling water is more than 3900 m 3 /h, the cooling water 24 will deviate from the first circulating flow and flow out from the inlet 33 of the partition cylinder 32 into the cooling water tank 20, which is not preferable.
  • the flow velocity of the cooling water 24 supplied from the middle cooling water pipe group 46 is preferably 1.8 m/s or more and 2.2 m/s or less. If the flow velocity of the cooling water 24 supplied from the middle cooling water pipe group 46 is slower than 1.8 m/s, the cooling water 24 will decelerate by the time it reaches the cylinder core of the partition cylinder 32, resulting in a strong and stable rise. This is not preferable because it makes it difficult for flow to occur. Furthermore, if the flow velocity of the cooling water 24 supplied from the middle cooling water pipe group 46 is faster than 2.2 m/s, the pressure loss in the cooling water pipes 41 will be high, and large-scale water supply equipment such as a pump will be required. So I don't like it.
  • the upper stage cooling water pipe group 44 is connected to the upper stage of the inclined surface 34 including the upper end of the partition cylinder 32.
  • the upper cooling water pipe group 44 includes an upper part of the partition cylinder 32 that includes a slit 42 having a predetermined gap at the periphery of the upper end of the partition cylinder 32 and a water supply port 43 on the upper inclined surface 34 of the partition cylinder 32.
  • the cover is connected to a water supply jacket 45 that supplies cooling water to the slit 42 and the water supply port 43 .
  • the upper cooling water pipe group 44 is connected to an inclined surface 34 that includes the upper end of the partition cylinder 32 in a range from the upper end of the partition cylinder 32 to 1000 m below.
  • the flow velocity of the cooling water 24 supplied from the slit 42 and the water supply port 43 is preferably 0.1 m/s or more and 0.7 m/s or less.
  • the amount of cooling water supplied from the upper cooling water pipe group 44 is preferably 700 m 3 /h or more and 3000 m 3 /h or less. If the amount of cooling water supplied from the upper cooling water pipe group 44 is less than 700 m 3 /h, it is not preferable because there is a possibility that the first circulation flow cannot be stabilized. Furthermore, if the amount of cooling water supplied from the upper cooling water pipe group 44 is more than 3000 m 3 /h, the effect of stabilizing the first circulating flow is saturated, and the slope 34 and drains only from the drain port 22 at the lower end of the partition cylinder 32, which is not preferable. Moreover, it is preferable that the distribution of the amount of cooling water supplied from the slit 42 and the water supply port 43 is 6:4.
  • At least one set of water tubes are horizontally connected to the side surface of the duct cylinder body 35 facing toward the cylinder core of the duct cylinder body 35.
  • the amount of cooling water supplied from the lower cooling water pipe group 48 is preferably 250 m 3 /h or more and 750 m 3 /h or less. If the amount of cooling water supplied from the lower cooling water pipe group 48 is less than 250 m 3 /h, it is not preferable because the second circulation flow within the duct cylinder body 35 is difficult to occur and there is a risk of creating a stagnation area with high water temperature. . Furthermore, if the amount of cooling water supplied from the lower cooling water pipe group 48 is greater than 750 m 3 /h, this is not preferable because drainage from the lower end of the partition cylinder 32 will be inhibited.
  • the flow velocity of the cooling water 24 supplied from the lower cooling water pipe group 48 is preferably 0.5 m/s or more and 1.0 m/s or less. If the flow rate of the cooling water 24 supplied into the duct cylinder 35 is slower than 0.5 m/s, the effect of stirring the inside of the duct cylinder 35 will be reduced, which is not preferable. Furthermore, if the flow velocity of the cooling water 24 supplied into the duct cylinder body 35 is faster than 1.0 m/s, water leakage from the gap between the lower end of the duct cylinder body 35 and the conveying device 50 will increase, which is not preferable.
  • FIG. 2 is a schematic cross-sectional view of the water flow control container 30 at a portion where the cooling water pipe group is connected.
  • FIG. 2(a) is a schematic cross-sectional view of the water flow control container 30 at a portion to which the upper cooling water pipe group 44 is connected
  • FIG. 2(b) is a water flow control diagram at the portion to which the middle cooling water pipe group 46 is connected.
  • 3 is a schematic cross-sectional view of a container 30.
  • FIG. FIG. 2(c) is a schematic cross-sectional view of the water flow control container 30 at a portion to which the lower cooling water pipe group 48 is connected.
  • the upper cooling water pipe group 44 is composed of two cooling water pipes 41, as shown in FIG. 2(a).
  • the cooling water 24 is supplied from two cooling water pipes 41 to a water supply jacket 45, and is distributed by the water supply jacket 45 to 16 water supply ports 43 arranged radially on the annular slit 42 and the inclined surface 34 of the partition cylinder 32. be done. Cooling water 24 is supplied into partition cylinder 32 from annular slit 42 and 16 water supply ports 43 .
  • the middle cooling water pipe group 46 is composed of four cooling water pipes 41 arranged horizontally toward the cylinder core of the partition cylinder 32. Cooling water 24 is supplied into partition cylinder 32 from four cooling water pipes 41 .
  • the lower cooling water pipe group 48 is composed of four cooling water pipes 41.
  • cooling water pipes 41 are arranged horizontally facing the cylinder core of the duct cylinder 35, and the other two cooling water pipes 41 are arranged on the side surface of the duct cylinder. Cooling water 24 is supplied into the duct cylinder body 35 from four cooling water pipes 41 . In this way, in the granular iron manufacturing apparatus 70 according to the present embodiment, cooling water is supplied into the partition cylinder 32 and the duct cylinder 35 by a total of ten cooling water pipes 41.
  • FIG. 2 shows an example in which the cross-sectional shape of the duct cylinder 35 is square, the cross-sectional shape of the duct cylinder 35 is not limited to this, and may be circular.
  • FIG. 3 is a schematic cross-sectional view illustrating the circulating flow that occurs within the partition cylinder 32 and the duct cylinder 35.
  • the first circulating flow B1 is a circulating flow that circulates within the partition cylinder 32.
  • the cooling water 24 supplied from the middle stage cooling water pipe group 46 joins together at the cylinder core, forming a strong upward flow. This strong upward flow spreads to the periphery near the input port 33.
  • the water flow that spreads to the peripheral portion becomes a downward flow that descends along the slope 34.
  • the downward flow merges with the cooling water flow from the slit 42 and the water supply port 43, and due to the rectification effect of these cooling water flows, it flows downward along the inclined surface 34 and is discharged from the lower end connected to the duct cylinder body 35.
  • the first circulating flow B1 within the partition cylinder 32 allows the water temperature in the region from the middle stage to the upper stage in the cooling area A to be maintained at an appropriate water temperature of around 50°C. Further, the strong upward flow generated in the cylinder core of the partition cylinder 32 becomes a countercurrent to the granulated iron 66 that is introduced from the input port 33 and descends, so that the granulated iron 66 can be cooled with high cooling efficiency.
  • the second circulating flow B2 is a circulating flow generated within the duct cylinder body 35.
  • the waste water from the lower end of the partition cylinder 32 merges with the low-temperature discharge flow from the lower cooling water pipe group 48 and is stirred, thereby creating a circulating flow within the duct cylinder 35. Thereby, the granulated iron collected by the partition cylinder 32 can be efficiently cooled.
  • the upward flow generated in the cylinder core of the partition cylinder 32 becomes a cooling water flow that opposes the falling granulated iron 66 that is input from the input port 33, so that high cooling efficiency can be obtained.
  • the total amount of cooling water supplied from the middle stage cooling water pipe group 46 be larger than the total amount of cooling water supplied from the upper stage cooling water pipe group 44.
  • the cooling water flow supplied from the upper cooling water pipe group 44 connected to the upper stage of the inclined surface 34 of the partition cylinder 32 descends along the slope 34, It collides with the discharge flow from the connected middle-stage cooling water pipe group 46. Therefore, if the amount of cooling water supplied from the upper stage cooling water pipe group 44 is larger than the amount of cooling water supplied from the middle stage cooling water pipe group 46, the water flow discharged from the middle stage cooling water pipe group 46 is caused by the flow of the cooling water. There is a concern that this will weaken and make it difficult for the first circulating flow B1 to be formed. Therefore, it is preferable that the total amount of cooling water supplied from the middle cooling water pipe group 46 be larger than the total amount of cooling water supplied from the upper cooling water pipe group 44. Furthermore, it is more preferable that the total amount of cooling water supplied from the middle stage cooling water pipe group 46 is about four times the total amount of cooling water supplied from the upper stage cooling water pipe group 44.
  • the total amount of cooling water supplied from the lower cooling water pipe group 48 connected to the duct cylinder body 35 is smaller than the total amount of cooling water supplied from the upper cooling water pipe group 44.
  • the total amount of cooling water supplied from the lower cooling water pipe group 48 becomes larger than the total amount of cooling water supplied from the upper cooling water pipe group 44, drainage from the lower end of the partition cylinder 32 to the duct cylinder 35 is inhibited, and the partition There is a risk that the temperature inside the cylinder 32 will increase on the contrary. Therefore, it is preferable that the total amount of cooling water supplied from the lower stage cooling water pipe group 48 is smaller than the total amount of cooling water supplied from the upper stage cooling water pipe group 44. Furthermore, it is more preferable that the total amount of cooling water supplied from the lower stage cooling water pipe group 48 is about 1/2 of the total amount of cooling water supplied from the upper stage cooling water pipe group 44.
  • the total amount of cooling water supplied from each cooling water pipe group is It is preferable to reduce the number of water tubes in the order of the water tube group 46, the upper cooling water tube group 44, and the lower cooling water tube group 48. Since it is preferable to control the total amount of cooling water supplied from each cooling water pipe group as described above, the granulated iron manufacturing apparatus 70 according to the present embodiment includes the upper cooling water pipe group 44, the middle cooling water pipe group 46, and the lower cooling water pipe group. Preferably, it further includes a control device for controlling the total amount of cooling water supplied from group 48.
  • the control device is constituted by a general-purpose computer, and controls cooling equipment such as a heat exchanger and a cooling tower (not shown) to control the amount of cooling water 24 supplied to each cooling water pipe group.
  • the granulated iron 66 cooled within the water flow control container 30 is discharged from the discharge port 36 provided at the bottom of the water flow control container 30.
  • the discharged iron granules 66 are transported outside the cooling water tank 20 by a transport device 50 such as a belt conveyor.
  • the conveying device 50 is not limited to a belt conveyor, but may be any other conveying device as long as it can convey the granulated iron 66 to the outside of the cooling water tank 20. However, it is preferable to use a mesh conveyor as the conveying device 50 so that the cooling water 24 is not carried out of the cooling water tank 20.
  • FIG. 4 is a schematic cross-sectional view showing another water flow control container 80 used in the granulated iron manufacturing apparatus according to the present embodiment.
  • the water flow control container 80 shown in FIG. 4 differs from the water flow control container 30 shown in FIG. 1 in that it has a protrusion 90.
  • the water supply port 43 for supplying the cooling water 24 is provided on the slope 34 of the partition cylinder 32, there is a concern that the granulated iron 66 falling along the slope 34 may enter the water supply port 43 and block the water supply port 43. occurs.
  • covering the upper side of the connection portion of the water supply port 43 and the middle stage cooling water pipe group 46 means that the protruding portion 90 is provided to a position where the connection portion of the water supply port 43 and the middle stage cooling water pipe group 46 is hidden when viewed from above. .
  • the protrusion part 90 is provided so as to protrude horizontally from the inclined surface 34 toward the inside of the partition cylinder 32 so as not to obstruct the flow of the supplied cooling water 24.
  • FIG. 5 is a schematic diagram of the water supply port 43 provided with the protrusion, viewed from the horizontal direction.
  • 5(a) shows an inverted V-shaped protrusion 90
  • FIG. 5(b) shows an inverted U-shaped protrusion 91.
  • the cross-sectional shape of the protrusion 90 is preferably an inverted V-shape that protrudes upward and is inclined so as to widen downward.
  • a protruding part 91 having an inverted U-shaped cross section may be provided instead of the protruding part 90.
  • a protruding part 91 having an inverted U-shaped cross section may be provided.
  • FIG. 6 is a schematic cross-sectional view showing another water flow control container 82 used in the granulated iron manufacturing apparatus according to the present embodiment.
  • the water flow control container 82 shown in FIG. 6 differs from the water flow control container 80 shown in FIG. 4 in that it has a protective cover 92. As shown in FIG.
  • the granulated iron 66 falling along the slope 34 may enter the water supply port 43 and block the water supply port 43.
  • the granulated iron 66 in the upper stage of the partition cylinder 32 is still in a molten state, if it adheres to the inside of the water supply port 43, it will be difficult to remove.
  • covering the upper side of the water supply port 43 means that the protective cover 92 is provided to a position where the water supply port 43 is hidden when viewed from above.
  • the protective cover 92 is provided at a position where the water supply port 43 is not hidden when the water supply port 43 is viewed from the horizontal direction so as not to obstruct the flow of the cooling water 24 supplied from the water supply port 43. It is preferable. Furthermore, the protective cover 92 also covers the sloped surface 34 above the water supply port 43 along the slope direction of the sloped surface 34. It is preferable that the upper end of the protective cover 92 has a closed structure so that the scattered droplets 64 do not enter the protective cover 92, and the slope angle of the protective cover 92 is preferably the same as that of the sloped surface 34. preferable.
  • FIG. 7 is a schematic diagram of the water supply port 43 provided with the protective cover 92, viewed from the horizontal direction.
  • the cross-sectional shape of the protective cover 92 is preferably a semicircle or a semiellipse that expands downward.
  • the first circulation flow B1 of the cooling water 24 from the bottom to the top is generated inside the partition cylinder 32, and further, the first circulation flow B1 is generated inside the duct cylinder 35.
  • a second circulating flow B2 of the cooling water 24 is generated from the bottom to the top, and the granulated iron 66 is cooled by these two circulating flows, thereby producing the granulated iron 66 from the molten iron 60. Since the first circulation flow B1 flows countercurrently to the direction in which the iron particles 66 descend, the iron particles 66 can be efficiently cooled by the first circulation flow B1.
  • FIG. 8 is a diagram showing simulation conditions for Invention Example 1 and Invention Example 2.
  • FIG. 9 is a diagram showing simulation conditions for Comparative Example 1 and Comparative Example 2.
  • the cooling water supply models of Invention Example 1, Invention Example 2, Comparative Example 1, and Comparative Example 2 are based on the piping layout, number of piping, cooling water flow distribution, and piping diameter (nominal diameter (A)) shown in FIGS. 8 and 9. The simulation was conducted with the following settings. Note that the cooling water pipe layout of Invention Example 1 is the same as the cooling water pipe layout of the water flow control container 30 shown in FIG.
  • the number of cooling water pipes connected to the water supply jacket of the upper stage cooling water pipe group is one, and the number of water pipes connected to the side surface of the duct cylinder of the lower stage cooling water pipe group is one compared to Invention Example 1.
  • the cooling water pipe layout is the same as the cooling water pipe layout of Invention Example 1 except that the number of cooling water pipes is smaller.
  • the total amount of cooling water supplied from the middle cooling water pipe group is approximately 40% of that in Invention Example 1, and the amount of cooling water supplied from the upper cooling water pipe group is three times that of Invention Example 1. This is a model with changed allocation.
  • Comparative Example 1 was a model in which the upper cooling water tube group and the lower cooling water tube group were eliminated, and cooling water was supplied only by the middle cooling water tube group.
  • the number of pipes, arrangement, flow rate of cooling water, and pipe diameter of Comparative Example 1 were the same as those of Invention Example 1.
  • the number of pipes in the middle cooling water pipe group and the lower cooling water pipe group is set to less than half of that in Invention Example 1, the amount of cooling water to be supplied is halved, and the amount of cooling water to be supplied from the upper cooling water pipe group is reduced to 50% compared to Invention Example 1. 1, and changed the flow distribution of cooling water.
  • the two pipes of the middle cooling water pipe group were connected to the inclined surface at a point symmetrical position with respect to the center of the horizontal cross section of the partition cylinder so that the central axes of the respective cooling water pipes were parallel to each other.
  • FIG. 10 is a diagram showing the simulation results of Invention Example 1 and Invention Example 2.
  • the temperature of the cooling water in the water flow control container was 52 to 69°C, achieving the target of 70°C or lower.
  • the maximum temperature when the granulated iron was deposited on the conveying device was 550°C, achieving the target temperature of 650°C or less for the granulated iron.
  • FIG. 11 is a schematic perspective view showing the flow of cooling water supplied from each cooling water pipe group in Invention Example 1.
  • FIG. 11(a) is a schematic perspective view showing the flow of cooling water supplied from the upper cooling water pipe group.
  • FIG. 11(b) is a schematic perspective view showing the flow of cooling water supplied from the middle cooling water pipe group.
  • FIG. 11(c) is a schematic perspective view showing the flow of cooling water supplied from the lower cooling water pipe group.
  • FIGS. 11(a) and 11(b) in the invention example, it was confirmed that a first circulating flow was generated within the partition cylinder. Furthermore, from FIG. 11(c), it was confirmed that in the invention example, a second circulation flow was generated within the duct cylinder.
  • FIG. 12 is a diagram showing the simulation results of Comparative Example 1 and Comparative Example 2.
  • Comparative Example 1 a strong upward flow occurred because a large amount of cooling water was supplied from the middle cooling water pipe group.
  • the cooling water was stirred by the upward flow, and the temperature of the cooling water in the center of the partition cylinder was maintained at 70° C. or lower.
  • the cooling water was not stirred in the upper and lower parts of the partition cylinder, and stagnation occurred in the cooling water in these areas.
  • the temperature when the granulated iron was deposited on the conveying device was 652°C, which slightly exceeded the target of 650°C or lower.
  • Comparative Example 2 the two pipes of the middle cooling water pipe group were partitioned on an inclined surface at a point symmetrical to the center of the horizontal cross section of the partition cylinder so that the central axes of the respective cooling water pipes were parallel to each other.
  • a cooling water pipe was connected to the cylinder. Therefore, unlike Invention Example 1 and Comparative Example 1, a strong upward flow near the cylinder core did not occur, and instead of the upward flow, a swirling flow that rose while swirling inside the partition cylinder was generated.
  • the water temperature inside the partition cylinder of Comparative Example 2 was lower than that of Invention Example 1 and Comparative Example 1, but this indicates that the heat amount of the granulated iron was not taken away, and the granulated iron was not placed on the conveying device.
  • the temperature during deposition reached a maximum of 700°C, significantly exceeding the target of 650°C or less, and the variation in iron grain temperature also increased to 460°C to 700°C.
  • the above simulation results confirmed that the iron granules can be efficiently cooled by the iron granules manufacturing apparatus according to the present embodiment.
  • FIG. 13 is a diagram showing the results of checking whether or not granulated iron has entered the water supply port 43.
  • Invention Example 3 is the water flow control container 80 shown in FIG. 4
  • Invention Example 4 is the water flow control container 82 shown in FIG.
  • Granulation device 12 Tundish 14 Molten iron receiver 16 Nozzle 18 Support 20 Cooling water tank 22 Drain port 24 Cooling water 30 Water flow control container 32 Partition cylinder 33 Inlet 34 Inclined surface 35 Duct cylinder 36 Outlet 40 Cooling water pipe group 41 Cooling water pipe 42 Slit 43 Water supply port 44 Upper cooling water pipe group 45 Water supply jacket 46 Middle cooling water pipe group 48 Lower cooling water pipe group 50 Conveying device 60 Molten iron 62 Liquid column 64 Droplet 66 Iron granules 70 Iron granules manufacturing device 80 Water flow control container 82 Water flow control container 90 Projection part 91 Projection part 92 Protective cover

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Nanotechnology (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Furnace Details (AREA)
PCT/JP2023/025176 2022-07-19 2023-07-06 粒鉄製造装置及び粒鉄製造方法 Ceased WO2024018916A1 (ja)

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JP2023578819A JP7468820B1 (ja) 2022-07-19 2023-07-06 粒鉄製造装置及び粒鉄製造方法
US18/994,386 US20260027620A1 (en) 2022-07-19 2023-07-06 Granular iron manufacturing apparatus and granular iron manufacturing method
KR1020257001253A KR20250024067A (ko) 2022-07-19 2023-07-06 입철 제조 장치 및 입철 제조 방법
CN202380052439.6A CN119497652A (zh) 2022-07-19 2023-07-06 粒铁制造装置及粒铁制造方法
EP23842841.1A EP4520461A4 (en) 2022-07-19 2023-07-06 GRANULAR IRON MANUFACTURING DEVICE AND GRANULAR IRON MANUFACTURING METHOD

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JP2022114591 2022-07-19

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2025134489A1 (ja) * 2023-12-20 2025-06-26 Ｊｆｅスチール株式会社 粒鉄製造装置
CN121360809A (zh) * 2025-12-18 2026-01-20 福建中伟半导体材料有限公司 一种高纯镉粉制备工艺

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5220948B1 (https=) 1968-02-05 1977-06-07
JPH0920902A (ja) 1995-06-30 1997-01-21 Nippon Steel Corp 粒銑の製造方法
JP2018115363A (ja) 2017-01-18 2018-07-26 Ｊｆｅスチール株式会社 軟磁性鉄粉の製造方法
JP2021127510A (ja) * 2020-02-17 2021-09-02 Ｊｆｅスチール株式会社 粒鉄製造装置
JP2021161465A (ja) * 2020-03-31 2021-10-11 Ｊｆｅスチール株式会社 粒鉄製造装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5220948A (en) 1975-07-24 1977-02-17 Osaka Denki Co Ltd Gas shielded type arc welding process
US10293407B2 (en) * 2014-03-31 2019-05-21 Jfe Steel Corporation Method of producing atomized metal powder
JP6372442B2 (ja) * 2015-07-31 2018-08-15 Ｊｆｅスチール株式会社 水アトマイズ金属粉末の製造方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5220948B1 (https=) 1968-02-05 1977-06-07
JPH0920902A (ja) 1995-06-30 1997-01-21 Nippon Steel Corp 粒銑の製造方法
JP2018115363A (ja) 2017-01-18 2018-07-26 Ｊｆｅスチール株式会社 軟磁性鉄粉の製造方法
JP2021127510A (ja) * 2020-02-17 2021-09-02 Ｊｆｅスチール株式会社 粒鉄製造装置
JP2021161465A (ja) * 2020-03-31 2021-10-11 Ｊｆｅスチール株式会社 粒鉄製造装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4520461A4

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2025134489A1 (ja) * 2023-12-20 2025-06-26 Ｊｆｅスチール株式会社 粒鉄製造装置
JP7708337B1 (ja) * 2023-12-20 2025-07-15 Ｊｆｅスチール株式会社 粒鉄製造装置
CN121360809A (zh) * 2025-12-18 2026-01-20 福建中伟半导体材料有限公司 一种高纯镉粉制备工艺

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CN119497652A (zh) 2025-02-21
KR20250024067A (ko) 2025-02-18
EP4520461A4 (en) 2025-06-18

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