JP7435540B2 - Granular pig iron manufacturing equipment and granular pig iron manufacturing method - Google Patents

Description

The present invention relates to a granular pig iron manufacturing apparatus and a granular pig iron manufacturing method for manufacturing granular pig iron from hot metal.

Granular pig iron is obtained by dispersing hot metal and then coagulating it into particles, and the average particle size thereof is about several mm to several tens of mm. In an integrated steelworks, when surplus blast furnace hot metal is generated due to problems after the steelmaking process, the surplus blast furnace hot metal, which is liquid at a high temperature of about 1200 to 1500°C, is poured into droplets of several mm to several tens of mm. The granular pig iron is cooled until it solidifies and is then stored as an iron source for cast iron. As a method of granulating hot metal, Patent Document 1 describes a method in which the flow of hot metal is applied to a fixed plate to break it down into drips, and the drips are dropped into a puddle of water in a cooling water tank to cool and solidify the hot metal, thereby producing granular pig iron. An apparatus for manufacturing is disclosed. The granulated pig iron that has been cooled in the cooling water tank is collected by a cylindrical flat plate structure and a connected pipe with the lower half of the cylinder tapering, and is stacked on a conveyor, which is a conveying device. from there to drying equipment and storage equipment.

Special Publication No. 52-20948

Drips of hot metal when placed in water have a high temperature of about 1,200 to 1,500°C, so when such high-temperature drips come into contact with water, a film boiling occurs in which a vapor film is formed on the surface of the hot object, and the water forms a vapor film. Heat is removed from the granular pig iron through the . The cooling capacity of water in this film boiling state is low; for example, when the surface temperature of the granular pig iron drops below 400℃, the steam film covering the granular pig iron becomes unstable and breaks, and the granular pig iron is directly cooled by water. The heat transfer coefficient is only several hundredths of that in the nucleate boiling state.

Therefore, by the time the granular pig iron is collected on the conveyor, although the surface of the granular pig iron has been cooled to around 700° C. and solidified, the inside of the granular pig pig remains in an unsolidified high temperature state. Since the granulated pig iron is stacked closely together on the conveyor, when the amount of heat removed from the surface of the granulated pig iron by the cooling water decreases, the amount of heat transferred from the inside of the granular pig iron to the surface by the cooling water decreases. Secondary heat is generated that exceeds the amount of heat removed and increases the surface temperature of the granular pig iron. For this reason, when the surface temperature of the pig iron granules rises again due to secondary heating while being conveyed on the conveyor, there is a problem in that the stacked pig iron particles easily fuse and coalesce to form a large lump. The present invention has been made to solve the above problems, and its purpose is to efficiently cool granular pig iron while being transported by a conveyor or other conveyor, thereby suppressing the coalescence of granular pig iron. An object of the present invention is to provide a manufacturing apparatus and a method for manufacturing granular pig iron.

The means for solving the above problems are as follows.
(1) A granulating device that converts hot metal into droplets, a cooling water tank that stores cooling water, a cooling container that is installed in the cooling water tank and that cools the droplets into granulated pig iron, and a conveying device for transporting the cooling water tank out of the cooling water tank; an inclined surface connecting to a discharge port, and the conveying device is provided with a conveyor for conveying the granular pig iron from inside the cooling water tank to outside the cooling water tank, and a conveyor provided above the conveyor in the cooling water tank. , a cooling water supply device for supplying cooling water to cool the granular pig iron carried out by the conveyor, the cooling water supply device supplying the cooling water to an area above the granular pig iron on the conveyor. Granular pig iron manufacturing equipment.
(2) The cooling water supply device is connected to a cooling water main pipe provided along the conveyance direction of the conveyor, and to the cooling water main pipe arranged in the conveyance direction, and extends in the width direction of the conveyor. The granular pig iron manufacturing apparatus according to (1), further comprising: a plurality of cooling water header pipes each having at least one supply port provided in the width direction.
(3) The granular pig iron manufacturing apparatus according to (2), wherein the supply port is a rectangular slit with a short side length of 3 mm or more.
(4) The conveyance device further includes a gutter-like member provided to cover the cooling water supply device from above, and the supply port is provided in the cooling water header pipe so as to face the conveyance direction. 2) The granular pig iron production apparatus described in 2).
(5) A method for producing granular pig iron using the granule pig iron production apparatus according to any one of (2) to (4), wherein the cooling water supply rate from the supply port is 2 m/sec or more and 3 m/sec. A method for producing granular pig iron within the following ranges.

The granular pig iron manufacturing apparatus of the present invention supplies cooling water above the granular pig iron being transported in a conveying device in which the granular pig pigs are piled up and the granular pig pigs tend to be crowded together. In this way, by replacing the cooling water in a limited area on the conveyor where the granular pig iron is collected, the granular pig iron can be efficiently cooled, and it is possible to suppress the fusion and coalescence of the granular pig pigs that are being transported by the conveyor device. . Furthermore, since the efficiency of cooling the granular pig iron by the cooling water is increased, the amount of cooling water used can be reduced and the size of the equipment can also be suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS It is a cross-sectional schematic diagram which shows an example of the granular pig iron production apparatus 10 based on this embodiment. FIG. 3 is a schematic top view of the cooling container 20. FIG. FIG. 4 is a schematic diagram showing a part of the transport device 40. FIG. It is a schematic diagram showing another example of the conveyance device concerning this embodiment. It is a schematic diagram of the granular pig iron manufacturing apparatus 10 used for simulation. 4 is a diagram showing the results of simulating the water temperature near the top surface of the conveyor 42. FIG. It is a figure which shows the result of simulating the granular pig iron temperature on the upper surface of the conveyor 42.

Hereinafter, the present invention will be explained through embodiments of the invention. FIG. 1 is a schematic cross-sectional view showing an example of a granular pig iron manufacturing apparatus 10 according to the present embodiment. Further, FIG. 2 is a schematic top view of the cooling container 20. The granular pig iron manufacturing apparatus 10 is an apparatus that manufactures granular pig iron 60 from hot metal 18. The hot metal 18 may be hot metal manufactured in a blast furnace, or hot metal manufactured by melting scrap in an electric furnace. The hot metal 18 used in the granular pig iron manufacturing apparatus 10 according to the present embodiment can be any hot metal manufactured by any manufacturing method as long as it has iron as its main component.

The granulated pig iron manufacturing apparatus 10 includes a granulating device 12 that turns hot metal 18 into droplets, a cooling container 20 that stores cooling water, and six cooling water discharge pipes 30 to 35 that supply cooling water to the cooling container 20. , a transport device 40, and a cooling water tank 36. The hot metal 18 is made into droplets in the granulating device 12 and cooled in the cooling container 20 to become granulated pig iron 60.

The hot metal 18 is transported by a hot metal pot, a torpedo car, etc. to a location where the granular pig iron manufacturing apparatus 10 is installed. The transported hot metal 18 is made into droplets by the granulating device 12. The granulating device 12 has, for example, a tundish 14 and a refractory 16, and is a device that allows hot metal 18 accommodated in the tundish 14 to flow out, and causes the flowed-out hot metal 18 to collide with the refractory 16 to form droplets. It is. Note that the granulating device 12 is not limited to this, and may be a device that causes water to collide with the hot metal 18 flowing out from the tundish 14 to form droplets. By using these granulating devices 12, hot metal 18 is adjusted to droplets that become granulated pig iron 60 with a predetermined particle size.

When the droplets become large, the heat capacity becomes large and solidification takes time, and there is a risk that the granular pig iron 60 will fuse and coalesce with each other in the cooling container 20 while still at high temperature, forming a large lump that will be difficult to transport. For this reason, it is preferable that the granulating device 12 converts the hot metal 18 into droplets such that the maximum length of the granulated pig iron 60 after cooling is 50 mm or less, more preferably 15 to 20 mm or less. . The hot metal 18 is turned into droplets by the granulating device 12 and falls into the cooling container 20 . Furthermore, in the granulating device 12, the amount of outflow of the hot metal 18 is controlled so that the droplets fall into the area where the cooling container 20 is provided.

The cooling container 20 contains cooling water and is provided within the cooling water tank 36 at a position to receive droplets. The cooling container 20 cools and solidifies the droplets with the cooling water stored therein to form granular pig iron 60. The cooling vessel 20 includes an inlet 24 that receives droplets, an outlet 26 that discharges the granular pig iron 60 and is smaller than the inlet 24, and an inclined surface 22 that connects the inlet 24 and the outlet 26. The inclined surface 22 may be formed inside the cooling container 20, and the shape of the outside of the cooling container 20 is not particularly limited. In the example shown in FIG. 1, the cooling container 20 has a cylindrical portion at the upper end, but the cylindrical portion may not be provided.

Six cooling water discharge pipes 30 to 35 are connected to the inclined surface 22 of the cooling container 20. The cooling water discharge pipes 30 to 35 are water pipes through which cooling water cooled to a water temperature of 30° C. or more and 45° C. or less by cooling equipment such as a heat exchanger or a cooling tower (not shown) passes. The cooled cooling water passes through six cooling water discharge pipes 30 to 35 and is discharged into the cooling container 20.

The angle of inclination of the inclined surface 22 of the cooling container 20 with respect to the horizontal plane is preferably 30° or more. By setting the angle of inclination of the inclined surface 22 with respect to the horizontal plane to be 30 degrees or more, the cooled granular pig pig 60 can be guided to the discharge port 26 without being retained on the inclined surface 22. Further, by setting the inclination angle to 30° or more, it is possible to efficiently change the flow direction of the cooling water discharged from the cooling water discharge pipes 30 to 35 and generate an upward swirling flow. By generating an upward swirling flow, the cooling water can be made to flow opposite to the granular pig pig 60 descending within the cooling vessel 20, thereby increasing the cooling effect of the granular pig pig 60.

On the other hand, if the angle of inclination of the inclined surface 22 with respect to the horizontal plane is made too large, the length of the inclined surface for guiding the granular pig iron 60 to the discharge port 26 of a predetermined size becomes long, which is not preferable. Therefore, it is preferable that the angle of inclination of the inclined surface 22 with respect to the horizontal plane is 60° or less. By setting the angle of inclination of the inclined surface 22 with respect to the horizontal plane to be 60 degrees or less, the inclined surface for guiding to the discharge port 26 becomes longer, the depth of the cooling container 20 becomes deeper, and the granular pig iron manufacturing apparatus 10 becomes larger. can be suppressed. Further, by setting the inclination angle to 60° or less, it is possible to efficiently change the flow direction of the cooling water discharged from the cooling water discharge pipes 30 to 35 and generate an upward swirling flow.

The granular pig iron 60 cooled in the cooling container 20 is guided by the inclined surface 22 and discharged from the discharge port 26 provided at the lower part of the cooling container 20. The discharged granular pig iron 60 is transported to the outside of the cooling water tank 36 by a transport device 40 including a conveyor 42 . The cooling water tank 36 accommodates cooling water, the cooling container 20, and a portion of the transport device 40. The same amount of cooling water contained in the cooling water tank 36 as the supplied cooling water is drained from the drain port 38 so that the cooling water level in the cooling water tank 36 is constant.

Next, the transport device 40 will be explained. FIG. 3 is a schematic diagram showing a part of the transport device 40. As shown in FIG. FIG. 3A is a schematic side cross-sectional view showing a part of the transport device 40. FIG. FIG. 3(b) is a schematic top view showing a part of the cooling container 20 and the transport device 40. The conveying device 40 conveys the granular pig iron 60 discharged from the discharge port 26 to the outside of the cooling water tank 36 . The conveying device 40 includes a conveyor 42 that conveys the granular pig iron 60 to the outside of the cooling water tank 36, and a cooling water supply device 44 provided above the conveyor 42.

The granular pig iron 60 discharged from the discharge port 26 is stacked on the conveyor 42. The conveyor 42 conveys the stacked pig iron 60 to the outside of the cooling water tank 36. The conveyor 42 is preferably a mesh conveyor so that the cooling water is not conveyed outside the cooling water tank 36 while the granular pig iron 60 is conveyed.

The cooling water supply device 44 includes a cooling water main pipe 46 provided along the conveyance direction of the conveyor 42 and a plurality of cooling water header pipes 48 . The cooling water main pipe 46 is a water pipe that supplies cooling water cooled by cooling equipment such as a heat exchanger or a cooling tower to the cooling water header pipe 48 . The cooling water header pipe 48 is a water pipe extending in the width direction of the conveyor 42. A plurality of rectangular slits 49 are provided in the cooling water header pipe 48 in the width direction, and cooling water is supplied from the slits 49 . The rectangular slit 49 is an example of a supply port. The supply port may be a rectangular slit having the same length as the length in the longitudinal direction of the width direction cooling water header pipe, or may be a plurality of circular tube nozzles arranged in the longitudinal direction. That is, at least one supply port in the width direction of the conveyor 42 may be provided.

Preferably, the rectangular slit 49 has a size that makes it difficult for it to become clogged with sludge mixed into the cooling water. Since the size of sludge mixed into the cooling water is about 1 to 2 mm, the length of the short side of the slit 49 is preferably 3 mm or more. The length of the long side of the slit 49 may be determined so as to ensure a cooling water supply rate of 2 to 3 m/sec.

The plurality of cooling water header pipes 48 are arranged in line in the conveyance direction of the conveyor 42, and each is connected to the cooling water main pipe 46. A space 62 to which cooling water is supplied from the slit 49 of the cooling water header pipe 48 is an area above the granular pig iron 60 on the conveyor 42 and sandwiched between the conveyor 42 and the cooling water supply device 44. Cooling water that has become high temperature by cooling the granular pig iron 60 discharged from the cooling container 20 remains in this area. Therefore, by supplying cooling water to the space 62 using the cooling water supply device 44, convection of the cooling water is generated in the space 62, and the high temperature cooling water is removed from the space 62. As a result, the temperature of the cooling water around the granular pig iron 60 conveyed by the conveyor 42 can be kept low, the granular pig iron 60 stacked on the conveyor 42 is cooled, and the surface temperature of the granular pig pig 60 is lowered. It can be suppressed that the granular pig iron 60 rises due to heat and fuses and coalesces.

Further, since the granular pig iron 60 collected on the conveyor 42 can be cooled by supplying cooling water to a limited area above the conveyor 42, there is no need to convect the cooling water in the entire cooling water tank 36, and a small amount of The granular pig iron 60 can be efficiently cooled with cooling water.

Since the surface temperature of the granular pig pig 60 discharged from the discharge port 26 is around 800° C., the surface of the granular pig pig 60 is covered with a vapor film. If low-temperature cooling water is directly injected onto the granular pig iron 60, and the steam film ruptures and the low-temperature cooling water comes into direct contact with the surface of the granular pig pig 60, a steam explosion, which is explosive boiling, may occur. Therefore, in order to stably cool the granular pig iron 60, the temperature of the cooling water around the granular pig pig 60 must be maintained in the range of 40°C to 65°C without directly injecting low-temperature cooling water to the granular pig iron 60. The temperature is preferably in the range of 45°C to 60°C, and more preferably in the range of 45°C to 60°C. When the water temperature exceeds 65°C, the water tends to boil, so a steam film is easily maintained around the high-temperature object, resulting in film boiling, and the cooling ability of the granular pig iron is significantly reduced. Further, if the temperature is lower than 40°C, the steam film covering the surface of the granular pig iron 60 becomes unstable, and there is a fear that a steam explosion will occur, which is not preferable.

The cooling water supply device 44 is provided with a plurality of cooling water header pipes 48 provided with a plurality of slits 49 in the width direction of the conveyor 42 and spaced apart in the transport direction of the conveyor 42 . In this way, by supplying cooling water to the space 62 from the multiple slits 49 of the cooling water header pipes 48 provided at a plurality of distances in the transport direction, the amount of cooling water supplied from each slit 49 can be reduced. It is possible to generate convection of cooling water in the space 62 while suppressing the cooling water from being directly injected into the granular pig iron 60.

The supply speed of the cooling water supplied from the rectangular slit 49 is preferably within the range of 2 m/sec or more and 3 m/sec or less. By setting the cooling water supply speed within the range of 2 m/sec or more and 3 m/sec or less, it is possible to suppress pressure loss from increasing in the cooling water header pipe 48 and the cooling water main pipe 46, and to provide cooling water to the space 62. The high temperature cooling water can be removed from the space 62 by causing water convection.

The amount of cooling water supplied from the cooling water header pipe 48 is determined from the simulation results described later until the granular pig iron 60 discharged from the discharge port 26 of the cooling vessel 20 is transported by the transport device 40 and transported out of the cooling water tank 36. It is only necessary to supply approximately 10 times the volume of cooling water corresponding to the volume of the space 62 at least during this time.

Further, it is preferable that the interval between the cooling water header pipes 48 be approximately the same length as the interval between the cooling water header pipe 48 and the granular pig iron 60 conveyed on the conveyor 42. This prevents the cooling water from remaining between the cooling water header pipes 48, and allows the cooling water temperature in the space 62 to be lowered evenly. The temperature of the cooling water supplied from the cooling water header pipe 48 is preferably within the range of 30°C or more and 45°C or less. If the temperature of the cooling water supplied from the cooling water header pipe 48 falls below 30°C and the supplied cooling water directly touches the surface of the granular pig iron 60, a steam explosion, which is an explosive boiling phenomenon, will occur. This is not desirable as it may cause concerns. Moreover, if the temperature of the cooling water exceeds 45° C., the cooling effect of the granular pig iron 60 will decrease, which is not preferable.

As described above, since the granular pig iron manufacturing apparatus 10 according to the present embodiment has the conveying device 40 equipped with the cooling water supply device 44, the cooling water in a limited area on the conveying device 40 where the granular pig iron 60 is collected can be replaced. This allows the granular pig iron 60 to be efficiently cooled, thereby suppressing the fusion and coalescence of the granular pig pigs 60 conveyed by the conveyor 42. Furthermore, since the cooling efficiency of the granular pig iron 60 by the cooling water is increased, the amount of cooling water used can be reduced and the size of the equipment can also be suppressed.

Although FIGS. 1 and 2 show an example in which six cooling water discharge pipes 30 to 35 are connected to the inclined surface 22 of the cooling container 20, the present invention is not limited to this. It is sufficient that at least one cooling water discharge pipe is connected to the inclined surface 22 of the cooling container 20.

FIG. 4 is a schematic diagram showing another example of the transport device according to this embodiment. FIG. 4A is a schematic side cross-sectional view showing a part of the transport device 50. FIG. FIG. 4(b) is a cross-sectional view of A in FIG. 4(a). In the conveying device 50 shown in FIG. 4, the same components as those in FIG. 3 are given the same reference numerals and redundant explanations will be omitted.

The conveyance device 50 has the following features: a gutter-like member 52 provided to cover the cooling water supply device 44 from above, and a slit 54 of the cooling water header pipe 48 facing the conveyance direction of the conveyor 42. This is different from the transport device 40 shown in FIG. In the conveying device 50, by supplying cooling water from each slit 54, a water flow that rises along the slope on the lower surface side of the gutter-like member 52 is generated, and this water flow flows into the space 62 in the direction of the slope of the slope. This creates a trailing flow 56 that rises. Thereby, the cooling water can be circulated while drawing the cooling water around the space 62, and the temperature of the cooling water around the granular pig iron 60 conveyed by the conveyor 42 is maintained in a low state. The granular pig iron 60 stacked on the conveyor 42 is cooled by this cooling water having a low water temperature, and the surface temperature of the granular pig pig 60 increases due to secondary heat, thereby suppressing the fusion and coalescence of the granular pig pigs 60. .

Next, the results of a simulation that confirmed the cooling effect of the granular pig iron 60 by the conveying device 40 of the granular pig iron manufacturing apparatus 10 according to the present embodiment will be explained. FIG. 5 is a schematic diagram of the granular pig iron manufacturing apparatus 10 used in the simulation. FIG. 5(a) is a perspective view of the granular pig iron manufacturing apparatus 10, and FIG. 5(b) is a schematic side view of the granular pig iron manufacturing apparatus 10.

The simulation conditions are as follows.
Inner diameter of cooling water main: 200A
Cooling water main length: 5m
Distance between cooling water main and top of conveyor: 750mm
Inner diameter of cooling water header pipe: 50A
Cooling water header pipe length: 1m
Distance between cooling water header pipe and granular pig iron on the conveyor: 250mm
Distance between cooling water header pipes: 250mm
Number of cooling water header pipes: 20 Slit shape: Rectangle (3mm x 20mm)
Spacing between slits: 10mm
Number of slits in one cooling water header pipe: 30 Cooling water supply speed: 3 m/s
Cooling water temperature: 35℃
Cooling water supply flow rate to the cooling water main pipe 46: 390 m ³ /h
(Cooling water supply amount for 5 min: 33m ³ )
Conveyor width: 1m
Conveyor conveyance speed: 1m/min
Volume of space sandwiched between the top surface of the conveyor and the cooling water supply device: 3.6 m ³
Initial water temperature in cooling water tank: 65℃
Surface temperature of granular pig iron 60: 700℃

FIG. 6 shows a cooling container 20 while supplying cooling water at a temperature of 35° C. from a cooling water supply device 44 with a length of 5 m provided above the conveyor 42 to a space 62 sandwiched between the conveyor 42 and the cooling water supply device 44. The water temperature near the top surface of the conveyor 42 was simulated when the granular pig iron 60 discharged from the discharge port 26 and piled up on the conveyor 42 was conveyed from the bottom surface of the cooling water tank 36 at a conveyance speed of 1 m/min for 5 minutes. It is a figure showing a result. The amount of cooling water supplied from the cooling water header pipe 48 via the cooling water main pipe 46 is determined by the amount of cooling water supplied from the cooling water header pipe 48 via the cooling water main pipe 46 during the 5 minutes during which the granular pig iron 60 is conveyed under the cooling water supply device 44. The volume was set at 33 m ³ (the flow rate of cooling water supplied to the cooling water main pipe 46 was 390 m ³ /h), which was about 10 times the volume (3.6 m ³ ) of the space sandwiched between the cooling water main pipe 46 and the cooling water main pipe 46 . By supplying cooling water from the cooling water supply device 44, the water temperature in the space 62 sandwiched between the conveyor 42 and the cooling water supply device 44, whose initial water temperature was 65°C, decreased to 50 to 58°C. In this way, it was confirmed that by using the granular pig iron production apparatus 10 according to the present embodiment, the water temperature in the space 62 sandwiched between the conveyor 42 and the cooling water supply device 44 could be maintained in the range of 45°C to 60°C. .

FIG. 7 is a diagram showing the results of simulating the temperature of the granular pig iron on the upper surface of the conveyor 42. Assuming that a high-temperature object 64 simulating 700° C. granular pig iron 60 was present on the conveyor 42, the temperature change of the object 64 was simulated. FIG. 7(a) is a side sectional view showing the temperature of the object 64 before cooling, and FIG. 7(b) is a front sectional view showing the temperature of the object 64 before cooling. FIG. 7(c) is a front sectional view showing the temperature of the object 64 10 seconds after cooling water was supplied.

As shown in FIG. 7, the high temperature object 64 was cooled by supplying cooling water from the slit, and the surface temperature of the high temperature object of 700° C. decreased to around 400° C. 10 seconds after the cooling water was supplied. As described above, by using the granular pig iron production apparatus 10 according to the present embodiment, the surface temperature of the granular pig pig 60 can be cooled from 700°C to around 400°C, and the granular pig iron 60 stacked on the conveyor 42 can be fused and bonded. It was confirmed that coalescence can be suppressed.

10 Granulated pig iron manufacturing equipment 12 Granulation equipment 14 Tundish 16 Refractory 18 Hot metal 20 Cooling container 22 Inclined surface 24 Inlet 26 Discharge port 30 Cooling water discharge pipe 31 Cooling water discharge pipe 32 Cooling water discharge pipe 33 Cooling water discharge pipe 34 Cooling water discharge pipe 35 Cooling water discharge pipe 36 Cooling water tank 38 Drain port 40 Conveying device 42 Conveyor 44 Cooling water supply device 46 Cooling water main pipe 48 Cooling water header pipe 49 Slit 50 Conveying device 52 Gutter-like member 54 Slit 56 Accompanying flow 60 Granular pig iron 62 Space 64 Object

Claims (5)

A granulation device that turns hot metal into droplets,
a cooling water tank containing cooling water;
a cooling container provided in the cooling water tank and cooling the droplets to form granular pig iron;
a conveying device for transporting the granular pig iron from the cooling water tank;
has
The cooling container includes an inlet for receiving the droplets, an outlet for discharging the granular pig iron and is smaller than the inlet, and an inclined surface connecting the inlet and the outlet,
The conveying device is provided with a conveyor that conveys the granular pig iron from inside the cooling water tank to outside the cooling water tank, and above the conveyor in the cooling water tank, and cools the granular pig iron carried out by the conveyor. A cooling water supply device that supplies cooling water,
The cooling water supply device supplies the cooling water to an area along the conveyance direction sandwiched between the conveyor and the cooling water supply device and above the granular pig iron on the conveyor. Device. The cooling water supply device is connected to a cooling water main pipe provided along the conveyance direction of the conveyor, and connected to the cooling water main pipe in line with the conveyance direction, and extends in the width direction of the conveyor, The granular pig iron production apparatus according to claim 1, comprising a plurality of cooling water header pipes each having at least one supply port in the width direction. The granular pig iron manufacturing apparatus according to claim 2, wherein the supply port is a rectangular slit with a short side length of 3 mm or more. The conveyance device further includes a gutter-like member provided to cover the cooling water supply device from above,
The granular pig iron manufacturing apparatus according to claim 2, wherein the supply port is provided in the cooling water header pipe so as to face the transport direction. A granular pig iron manufacturing method using the granular pig iron manufacturing apparatus according to any one of claims 2 to 4,
A method for producing granular pig iron, wherein the cooling water supply rate from the supply port is within a range of 2 m/sec or more and 3 m/sec or less.

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