WO2021199281A1

WO2021199281A1 - Cooling device for sintered ore

Info

Publication number: WO2021199281A1
Application number: PCT/JP2020/014811
Authority: WO
Inventors: 真敏下川
Original assignee: ＰｒｉｍｅｔａｌｓＴｅｃｈｎｏｌｏｇｉｅｓＪａｐａｎ株式会社
Priority date: 2020-03-31
Filing date: 2020-03-31
Publication date: 2021-10-07
Also published as: JPWO2021199281A1; KR20220111694A; CN114945691A; CN114945691B; JP7225471B2

Abstract

This cooling device for sintered ore comprises: a deposition tank having an internal space for receiving sintered ore, and a lower opening through which the sintered ore can be discharged; a rotary table which is disposed below the deposition tank at an interval from the lower opening, and configured to rotate together with the deposition tank; a scraper provided between the deposition tank and the rotary table; an exhaust hood provided above the deposition tank so as to communicate with the internal space of the deposition tank; and a nozzle which is provided at a position below the lower opening and above the rotary table, and configured to discharge a cooling fluid.

Description

Sinter cooling device

This disclosure relates to a sinter cooling device.

The high-temperature sinter produced by the sinter is cooled and then transported to the blast furnace by a conveyor or the like. In order to cool the high temperature sinter, a rotary cooling device including an annular sedimentation tank may be used to cool the sinter by circulating air in the sedimentation tank. In order to enhance the cooling effect of such a cooling device, it has been proposed to use a cooling fluid (cooling water or the like) in combination.

Patent Document 1 describes a rotary table, an annular cooling tank provided above the rotary table, a cooling air introduction port (louver) provided at the lower part of the cooling tank, and a blower for sucking cooling air. A cooling device for the sintered ore provided is disclosed. In this cooling device, by sucking air with a blower, cooling air is introduced into the cooling tank through the cooling air introduction port, and the cooling air flows upward in the cooling tank, so that the inside of the cooling tank is inside. The sintered ore supplied to is cooled. Further, in the cooling device described in Patent Document 1, in order to improve the cooling capacity, cooling water is supplied from above the cooling tank to the inner surface side of the inner peripheral wall of the cooling tank.

Japanese Unexamined Patent Publication No. 2013-79766

As described in Patent Document 1, it is considered that the cooling effect can be enhanced by using cooling air and cooling water together for cooling the sinter. On the other hand, for example, as described in Patent Document 1, when the cooling water is supplied from above the sedimentary tank, the cooling water is supplied to the relatively high temperature sinter at the upper part of the sedimentary tank. In this case, the cooling water is rapidly cooled. As a result, cracks are likely to occur in the sinter, which may result in pulverization in a blast furnace and deterioration of product quality.

In view of the above circumstances, at least one embodiment of the present invention aims to provide a sinter cooling device capable of improving the cooling effect while suppressing deterioration of product quality.

The sinter cooling device according to at least one embodiment of the present invention
An internal space for receiving the sinter and a sedimentary tank with a lower opening capable of discharging the sinter.
A rotary table, which is arranged below the deposit tank at a distance from the lower opening and is configured to rotate together with the deposit tank.
A scraper provided between the deposit tank and the rotary table,
An exhaust hood provided above the deposit tank so as to communicate with the internal space of the deposit tank.
A nozzle provided below the lower opening and above the rotary table and configured to discharge the cooling fluid.
To be equipped.

According to at least one embodiment of the present invention, there is provided a sinter cooling device capable of improving the cooling effect while suppressing deterioration of product quality.

It is a schematic cross-sectional view of the sinter cooling apparatus which concerns on one Embodiment. It is the schematic in the plan view of the air cooling part which constitutes the cooling device shown in FIG. 1A. FIG. 5 is a schematic view of a cross section of a lower opening of the cooling device shown in FIG. 1A in a plan view. It is a partial schematic sectional view of the cooling apparatus which concerns on one Embodiment. It is a partial schematic sectional view of the cooling apparatus which concerns on one Embodiment. It is a figure which shows schematic the CC cross section of FIG. It is a schematic diagram which shows the structure of the cooling device 1 which concerns on one Embodiment. It is a partial schematic sectional view of the annular hopper (sedimentation tank) which concerns on one Embodiment. It is a partial schematic sectional view of the annular hopper (sedimentation tank) which concerns on one Embodiment. It is a partial schematic sectional view of the annular hopper (sedimentation tank) which concerns on one Embodiment. It is a partial schematic sectional view of the annular hopper (sedimentation tank) which concerns on one Embodiment. It is a schematic diagram in the plan view of the cooling device which concerns on one Embodiment.

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present invention to this, but are merely explanatory examples. No.

FIG. 1A is a schematic cross-sectional view of a sinter cooling device according to an embodiment. FIG. 1B is a schematic view of an air cooling unit constituting the cooling device shown in FIG. 1A in a plan view. FIG. 2 is a schematic view of a cross section of the lower opening of the cooling device shown in FIG. 1A in a plan view. The sinter is obtained by subjecting iron ore, which is a raw material of pig iron, to a sinter treatment as a pretreatment. The particle size of the sinter is generally about 5 mm or more and 200 mm or less.

As shown in FIG. 1, the sinter cooling device 1 according to the embodiment includes an annular hopper 2 (deposit tank) and a rotary table 12 provided around a central axis O along the vertical direction, and an annular hopper 2. It is provided with an air cooling unit 10 for cooling the sinter 5 supplied to the vehicle. Further, the cooling device 1 is provided with a scraper 30 for scraping out the sintered ore 5 deposited on the rotary table 12.

The annular hopper 2 includes an inner peripheral wall 3 and an outer peripheral wall 4 provided in a circumferential shape around the central axis O, and has an inner peripheral wall surface 3a which is a wall surface of the inner peripheral wall 3 and an outer peripheral wall surface 4a which is a wall surface of the outer peripheral wall 4. The annular internal space 6 is defined by and. Above the annular hopper 2, a supply chute 27 for supplying the high-temperature sintered ore 5 from a sintering machine (not shown) to the annular hopper 2 is provided. The sinter 5 supplied from the supply chute 27 through the upper end opening of the annular hopper 2 is deposited in the internal space 6 of the annular hopper 2. An annular hood 18 (exhaust hood) that covers the upper portion of the annular hopper 2 is provided on the upper portion of the annular hopper 2. That is, the hood 18 is provided above the annular hopper 2 so as to communicate with the internal space 6 of the annular hopper 2.

The rotary table 12 is provided around the central axis O below the annular internal space 6 of the annular hopper 2. The sinter 5 deposited in the internal space 6 of the annular hopper 2 is discharged downward through the lower opening 2a of the annular hopper 2, and the sinter 5 is deposited on the rotary table 12. There is.

The inner peripheral wall 3 and the rotary table 12 of the annular hopper 2 are supported by the

frames

21 and 22 provided on the inner peripheral side thereof. The

frames

21 and 22 are rotatably coupled to the central bearing 14 provided at the position of the central axis O on the foundation 13. The outer peripheral wall 4 of the annular hopper 2 is supported by a support beam (not shown) extending between the inner peripheral wall 3 and the outer peripheral wall 4.

A plurality of circular rails 15 are fixedly installed on the lower surface of the frame 21 below the rotary table 12. Further, on the foundation 13, a plurality of support rollers 16 are arranged in a circular shape corresponding to the plurality of circular rails 15, and the rotary table 12 and the annular hopper 2 are supported via the rails 15. It is rotatably supported on the roller 16. A drive motor 17 is connected to some of the support rollers 16, so that the rotary table 12 and the annular hopper 2 rotate around the central axis O due to the rotational friction force of the support rollers 16 by the drive motor 17. It has become.

The scraper 30 is provided between the lower opening 2a of the annular hopper 2 and the rotary table 12. The scraper 30 is configured to guide the sinter 5 deposited on the rotary table 12 to the radial outside of the rotary table 12. As a result, the sinter 5 deposited on the rotary table 12 and in the internal space 6 of the annular hopper 2 is gradually discharged to the outside of the cooling device 1.

The air cooling unit 10 is configured to supply a cooling fluid (for example, air) to the internal space 6 of the annular hopper 2. In the exemplary embodiment shown in FIGS. 1A and 1B, the air cooling unit 10 has an inner louver 7, an outer louver 8, a central louver 9, and a ventilation duct for taking in air from the outside into the internal space 6 of the annular hopper 2. 11 is included. Further, the air cooling unit 10 includes a blower 20 for sucking air from above the annular hopper 2.

As shown in FIGS. 1A and 1B, the inner louver 7 and the outer louver 8 are incorporated in the lower part of the inner peripheral wall 3 and the outer peripheral wall 4 of the annular hopper 2, respectively, and air (cooling fluid) from the outside of the annular hopper 2. It forms a passage to take in. The central louver 9 is provided in a circumferential shape between the inner peripheral wall 3 and the outer peripheral wall 4 in the radial direction. The ventilation duct 11 is provided inside the annular hopper 2 so as to extend along the radial direction between the inner peripheral wall 3 and the outer peripheral wall 4, and air is introduced into the annular hopper 2 from at least one of the inner peripheral wall 3 or the outer peripheral wall 4. Is configured to capture. The air taken in from the outside of the annular hopper 2 is supplied to the central louver 9 by the ventilation duct 11.

The blower 20 is connected to an exhaust duct 19 provided above the annular hopper 2. The exhaust duct 19 is connected to the hood 18. By sucking with the blower 20, air is taken into the annular hopper 2 via the inner louver 7, the outer louver 8, the central louver 9, and the ventilation duct 11, and the air directs the inside of the annular hopper 2 upward. It flows and is further discharged to the outside of the cooling device 1 through the exhaust duct 19.

A dust remover for removing dust contained in the air sucked by the blower 20 may be provided on the upstream side of the blower 20. Further, the air sucked by the blower 20 may be supplied to an exhaust heat recovery device (boiler or the like) for recovering the heat of the air.

The cooling device 1 includes a seal portion 23 for suppressing leakage of cooling air between the annular hopper 2 that rotates and the hood 18 that does not rotate. The seal portion 23 shown in FIG. 1 includes an annular tub portion 24 provided on the inner peripheral wall 3 and the upper portion of the outer peripheral wall 4, and a circumferential sealing plate 26 attached to the hood 18. A predetermined amount of the sealing liquid 25 (for example, water) is supplied to the tub portion 24, and the lower end portion of the sealing plate 26 is immersed in the sealing liquid 25 so that the upper portion of the annular hopper 2 and the hood 18 are formed. The space is sealed.

In the cooling device 1 configured in this way, while the annular hopper 2 rotates around the central axis O together with the rotary table 12, the high-temperature sintered ore 5 passes through the supply chute 27 from above to the annular hopper 2. It is supplied to the internal space 6. The sinter 5 is deposited on the rotary table 12 and in the internal space 6 of the annular hopper 2 while forming a circumferential layer. The sinter 5 deposited in the internal space 6 is taken into the annular hopper 2 by the air cooling unit 10 and cooled by the air flowing upward in the annular hopper 2.

The sinter 5 deposited on the rotary table 12 below the annular hopper 2 is guided radially outward by the scraper 30 as the annular hopper 2 and the rotary table 12 rotate, and the sinter 5 is guided to the lower opening 2a of the annular hopper 2. It is discharged from the annular hopper 2 via an open portion formed between the rotary table 12 and the rotary table 12. The sinter 5 discharged by the scraper 30 is conveyed by a conveying means such as a belt conveyor 29.

As described above, as the sinter 5 is discharged from the annular hopper 2, the sinter 5 accumulated in the annular hopper 2 descends. The annular hopper 2 and the rotary table 12 are operated several times (for example, from 5 to 5) until the sinter 5 supplied from the supply chute 27 to the annular hopper 2 is discharged from below the annular hopper 2 by the scraper 30. 15 times) Rotate.

As shown in FIG. 2, the scraper 30 is provided so that the tip surface 31 of the scraper 30 faces the inner peripheral wall surface 3a of the annular hopper 2. The scraper 30 may be provided so as to extend along the radial direction of the annular hopper 2 (or the rotary table 12) in a plan view, or the rotation of the annular hopper 2 and the rotary table 12 with respect to the radial direction. It may be arranged so as to be inclined in the direction. In a plan view, the inclination angle φ (see FIG. 2) of the scraper 30 with respect to the radial direction may be, for example, 15 degrees or more and 45 degrees or less. In the present specification, the direction of the inclination angle φ (where φ is 15 degrees or more and 45 degrees or less) with respect to the radial direction is defined as a direction according to the radial direction. In the present specification, the vertical direction is a direction along the vertical direction, which is the same direction as the direction of the central axis O.

Hereinafter, the sinter cooling device 1 according to some embodiments will be described in more detail. 3 and 4 are partial schematic cross-sectional views of the cooling device according to the embodiment, respectively, and schematically cross-sectional views orthogonal to the length direction of the scraper 30 (that is, AA cross-section of FIG. 2). It is a figure which shows. FIG. 5 is a diagram schematically showing a CC cross section of FIG. FIG. 6 is a schematic view showing the configuration of the cooling device 1 according to the embodiment, and is a diagram schematically showing a cross section orthogonal to the length direction of the scraper 30.

As shown in FIGS. 1A and 3 to 6, the cooling device 1 includes a nozzle 50 provided at a position below the lower opening 2a of the annular hopper 2 and above the rotary table 12. The nozzle 50 is configured to discharge a cooling fluid (for example, water) from the nozzle hole 52.

In the exemplary embodiment shown in FIGS. 3-5, the nozzle 50 is supported by the scraper 30. The scrapers 30 shown in FIGS. 3 to 5 are provided so as to face each other in the rotation direction (circumferential direction) of the rotary table 12 with the upper side wall portion 32 and the lower side wall portion 35 provided so as to face each other in the vertical direction. The upstream wall portion 33 and the downstream wall portion 34 are included. The upper side wall portion 32 is connected to the upstream wall portion 33 and the downstream wall portion 34 at the upstream side end portion and the downstream side end portion, respectively, and the lower side wall portion 35 is connected to the downstream wall portion 34 at the downstream side end portion. The inner space 36 is formed by the inner surfaces of the upper side wall portion 32, the downstream wall portion 34, and the lower side wall portion 35. The outer surface of the upper side wall portion 32 forms the upper surface 30a of the scraper 30, and the outer surface of the downstream wall portion 34 forms the downstream end surface 30b of the scraper 30.

The scraper 30 shown in FIGS. 3 and 4 is provided with a liner 40 for protecting the scraper 30 from wear due to friction with the sintered ore. The liner 40 shown in FIGS. 3 and 4 includes an upstream liner 42 provided on the upstream side of the upstream wall portion 33 and an upper liner 41 provided above the upper side wall portion 32. The upper liner 41 shown in FIG. 4 is provided at a distance from the upper surface 30a (upper side wall portion 32) of the scraper 30 in the vertical direction.

In the exemplary embodiment shown in FIG. 3, the nozzle 50 is provided so that a part of the nozzle 50 is located in the inner space of the scraper 30, and the nozzle hole 52 is provided in the rotation direction (circumference) of the rotary table 12. In the direction), it faces the downstream side. The cooling fluid from the nozzle 50 is discharged toward the downstream side of the downstream end surface 30b through the opening 37 provided in the downstream end surface 30b of the scraper 30.

In the exemplary embodiment shown in FIG. 4, the nozzle 50 is provided on the upper surface 30a of the scraper 30 at a position upstream of the downstream end surface 30b of the scraper 30, and the nozzle hole 52 is a rotation of the rotary table 12. It faces the downstream side in the direction (circumferential direction). The cooling fluid discharged from the nozzle 50 stays on the upper surface 30a of the scraper 30 at least temporarily.

In the cooling device 1 according to the above-described embodiment, since the nozzle 50 capable of discharging the cooling fluid is provided at a position below the lower opening 2a of the annular hopper 2 and above the rotary table 12, the inside of the annular hopper 2 After being cooled by air, the cooling fluid from the nozzle can be supplied to the sintered ore 5 discharged from the lower opening 2a. That is, since the cooling fluid from the nozzle 50 was supplied to the sinter 5 whose temperature was lowered by being cooled by air to further cool the sinter, the sinter was baked while suppressing the occurrence of cracks due to quenching. The sinter 5 can be sufficiently cooled. Therefore, the cooling effect can be improved while suppressing the deterioration of the product quality. Thereby, for example, equipment such as a belt conveyor 29 for transporting the cooled sinter 5 can be protected from high temperature, or the processing speed by the cooling device 1 to protect these equipment from high temperature. The need to reduce can be reduced.

Further, when the cooling fluid is discharged at a position radially outside the lower opening 2a, the powder of the sintered ore containing the discharged cooling fluid acts as a cooling air intake port (louver or the like) of the annular hopper 2. It may be sucked through and cause clogging of the cooling air intake port. In this regard, according to the above-described embodiment, the nozzle 50 is located below the lower opening 2a of the annular hopper 2 (that is, radially inside the annular hopper 2 and radially outside the inner peripheral wall 3). Since the cooling fluid is discharged, clogging of the cooling air intake port as described above is unlikely to occur.

Further, according to the above-described embodiment, since the sinter 5 is cooled by using a cooling fluid such as water, the sinter 5 can be cooled more efficiently. For example, the equipment can be made more compact than the case where the same cooling effect can be obtained only by air cooling, or the energy required for operating the cooling device can be reduced.

Further, since the above-mentioned cooling device 1 has a simple configuration using the nozzle 50, if there is an existing cooling device, the nozzle 50 is additionally added to the existing cooling device to relate to the above-described embodiment. The cooling device 1 can be obtained relatively easily.

Further, in the above-described embodiment, the nozzle 50 can be provided in a wide range in the radial direction below the lower opening 2a of the annular hopper 2 and above the rotary table 12. As a result, as compared with the case where cooling water is supplied to the inner wall surface (inner peripheral wall surface 3a and outer peripheral wall surface 4a) of the annular hopper, for example, as described in Patent Document 1, the inner peripheral wall surface 3a and the outer peripheral wall surface 4a are combined. The cooling fluid can be supplied over a wide range in the radial direction including the central region between them, and the sinter 5 can be cooled more effectively.

In some embodiments, the nozzle 50 is configured to supply the cooling fluid downstream of the scraper 30 or above the scraper 30 in the direction of rotation of the rotary table 12. For example, in the exemplary embodiment shown in FIG. 3, the nozzle 50 supplies the cooling fluid to the downstream side of the scraper 30. Further, in the exemplary embodiment shown in FIG. 4, the nozzle 50 supplies the cooling fluid above the scraper 30.

Here, the sinter 5 in the internal space 6 of the annular hopper 2 moves to the downstream side in the rotation direction with respect to the scraper 30 as the rotary table 12 rotates. Then, as shown in FIG. 6, when the sinter 5 located above the scraper 30 passes the position of the downstream end surface 30b of the scraper 30 in the circumferential direction, it passes from the upper surface 30a of the scraper 30 to the upper surface of the rotary table 12. (Ie, move to the downstream side of the scraper 30). In FIG. 6, the sintered ore 5 after descending from the upper surface 30a of the scraper 30 toward the upper surface of the rotary table 12 is shown by a broken line. Further, the sintered ore 5 in the vicinity of the downstream end surface 30b of the scraper 30 moves to the vicinity of the upstream side of the scraper 30 when the rotary table 12 rotates about once, and is moved outward in the radial direction by the scraper 30. It is scraped out.

In this regard, according to the above-described embodiment, since the nozzle 50 for discharging the cooling fluid is provided on the downstream side of the scraper 30 or above the scraper 30, the cooling fluid is supplied to the sinter 5 and then the firing is performed. It is possible to secure a relatively long time for the ore to be scraped to the outside of the rotary table 12 by the scraper. That is, the contact time between the sinter 5 and the cooling fluid can be secured for a relatively long time, whereby the cooling effect of the sinter 5 by the cooling fluid can be enhanced.

In some embodiments, the nozzle 50 is configured to supply the cooling fluid to the unloading region Rd (see FIG. 6) on the downstream side of the scraper 30 in the direction of rotation of the rotary table 12. The unloading region Rd may be a region in which the sinter 5 deposited above the scraper 30 can move downward. The unloading region Rd is within a range in which the distance from the downstream end surface 30b of the scraper 30 in the circumferential direction (rotation direction of the rotary table 12) is equal to or less than the height Hs (see FIG. 6) in the vertical direction of the scraper 30. You may.

The unloading region in the cooling device 1 is the region immediately after the scraper 30 on the downstream side of the scraper 30, and the sinter 5 resting on the upper surface of the scraper 30 moves downward toward the upper surface of the rotary table 12. The area. In this regard, according to the above-described embodiment, since the cooling fluid is supplied to the unloading region Rd in which the sinter 5 moves downward, the region in which the sinter 5 is stationary in the vertical direction (for example, It is easier to supply the cooling fluid to a larger amount of sinter than in the case of supplying the cooling fluid to the region downstream of the unloading region Rd). Further, since the cooling fluid is supplied to the region immediately after the scraper 30, the contact time between the sinter 5 and the cooling fluid can be secured relatively long. Thereby, the sinter 5 can be cooled more effectively.

In some embodiments, the nozzle hole 52 (nozzle 50) may be provided at a position where the distance Hn (see FIGS. 3 and 4) in the vertical direction from the lower surface of the scraper 30 is Hs / 2 or more.

According to the above-described embodiment, since the nozzle 50 is provided at a relatively high position, most of the sinter 5 moving downward can pass in the vicinity of the nozzle 50. This makes it easier to supply the cooling fluid to many sinters, and the sinter 5 can be cooled more effectively.

In some embodiments, for example, as shown in FIG. 4, the nozzle 50 is configured to supply a cooling fluid above the scraper 30. The cooling fluid discharged from the nozzle 50 may stay on the upper surface 30a of the scraper 30 at least temporarily.

In the above-described embodiment, since the cooling fluid is supplied above the scraper 30, the cooling fluid is supplied to the sinter 5 which is deposited above the scraper 30 and immediately moves downward as the rotary table 12 rotates. Can be supplied. Therefore, it is easier to supply the cooling fluid to a larger amount of the sinter as compared with the case where the cooling fluid is supplied to the region where the sinter 5 is stationary in the vertical direction. Further, since the cooling fluid is supplied above the scraper 30, the contact time between the sinter 5 and the cooling fluid can be secured for a relatively long time. Thereby, the sinter 5 can be cooled more effectively.

In some embodiments, the nozzle 50 is supported by the scraper 30, as shown, for example, in FIGS. 3 and 4.

In the rotary cooling device, the scraper 30 usually extends along a radial direction or a direction according to the radial direction, and has an upper surface 30a and a downstream end surface 30b. In this regard, according to the above-described embodiment, since the nozzle 50 is supported by the scraper 30, the cooling fluid can be discharged to the region above the scraper 30 or immediately after (downstream) the scraper in the rotational direction. Nozzle 50 can be appropriately provided by using the scraper 30. Further, since the nozzle 50 is supported by the scraper 30, the nozzle 50 can be moved together with the scraper 30 with respect to the annular hopper 2 and the rotary table 12 (for example, the nozzle 50 can be inserted and removed in the length direction of the scraper 30). The maintenance of 50 can be easily performed.

In some embodiments, the nozzle 50 is configured to discharge the cooling fluid through an opening provided in the downstream end face 30b of the scraper 30. For example, in the exemplary embodiment shown in FIG. 3, the nozzle 50 is configured to discharge the cooling fluid through an opening 37 provided in the downstream end face 30b (downstream wall 34) of the scraper 30. In this embodiment, the nozzle hole 52 of the nozzle 50 is located inside the opening 37 provided in the downstream wall portion 34 of the scraper 30, and the cooling fluid from the nozzle hole 52 is discharged through the opening 37. ing. In another embodiment, the entire nozzle 50 including the nozzle hole 52 is located in the inner space 36 of the scraper so that the cooling fluid from the nozzle hole 52 located in the inner space 36 is discharged through the opening 37. It may be.

According to the above-described embodiment, the cooling fluid from the nozzle 50 is discharged through the opening 37 provided in the downstream end surface 30b of the scraper 30, so that the contact between the nozzle 50 and the sinter 5 is suppressed. Can be done. As a result, it is possible to suppress damage or wear of the nozzle 50, or blockage of the nozzle 50 due to adhesion of powder such as sintered ore 5.

In some embodiments, the nozzle 50 may be provided above the scraper 30, for example, as shown in FIG.

In this case, since the nozzle 50 is provided at a position above the scraper 30, the nozzle 50 can be easily installed and the nozzle 50 can be easily inspected.

Further, although not particularly shown, in some embodiments, the nozzle 50 may be provided at a position downstream of the downstream end surface of the scraper 30 in the rotation direction of the rotary table 12. Also, in some embodiments, the nozzle 50 may be supported by a structure other than the scraper 30.

In some embodiments, the cooling device 1 includes a protective cover 60 provided to cover the nozzle 50 from above. In the exemplary embodiment shown in FIGS. 3 and 4, the upstream liner 42 (liner 40) provided above the scraper 30 functions as the protective cover 60 described above.

According to the above-described embodiment, since the protective cover 60 that covers the nozzle 50 from above is provided, the sinter 5 located above the nozzle 50 (for example, the sinter 5 above the scraper 30) comes into contact with the nozzle 50. It is possible to suppress the nozzle 50 and protect the nozzle 50 from the impact and wear caused by the sinter 5.

In some embodiments, the cooling device 1 includes a supply pipe 54 for supplying the cooling fluid to the nozzle 50, and at least a part of the supply pipe 54 is provided inside the scraper 30. For example, in the exemplary embodiment shown in FIG. 5, at least a portion of the supply pipe 54 is provided in the inner space 36 of the scraper 30. In some embodiments, at least a portion of the supply pipe 54 that is provided to overlap the rotary table 12 in plan view is provided inside the scraper 30.

According to the above-described embodiment, since at least a part of the supply pipe 54 for supplying the cooling fluid to the nozzle 50 is provided inside the scraper 30, it is possible to prevent the sinter 5 from coming into contact with the supply pipe 54. be able to. Therefore, the supply pipe 54 can be protected from the impact and wear caused by the sinter 5. Further, according to the above-described embodiment, since at least a part of the supply pipe 54 for supplying the cooling fluid to the nozzle 50 is provided inside the scraper 30, a member provided in the vicinity of the scraper 30 (for example, the scraper 30). It is possible to avoid interference with the member for supporting the).

7 to 10 are partial schematic cross-sectional views of the annular hopper 2 (sedimentation tank) constituting the sinter cooling device 1 according to the embodiment, respectively, and correspond to the BB cross section of FIG. It is a figure to do. FIG. 11 is a schematic view of the cooling device 1 according to the embodiment in a plan view.

In the exemplary embodiment shown in FIGS. 7 and 8, the inner louver 7 and the outer louver 8 are used as air intake ports for the inner space 6 of the annular hopper 2 as in the embodiments shown in FIGS. 1A and 1B. , Central louver 9, and ventilation duct 11 (not shown in FIGS. 7 and 8, see FIG. 1B). In the exemplary embodiment shown in FIGS. 9 and 10, the inner louver 7 and the outer louver 8 are included as the air intake ports of the annular hopper 2 into the internal space 6, but the central louver 9 and the ventilation duct 11 are not included.

In some embodiments, the cooling device 1 includes a plurality of nozzles 50 arranged along the radial direction, for example, as shown in FIGS. 7 to 10.

In this case, the nozzle 50 can be provided over a wide range in the radial direction. As a result, as compared with the case where cooling water is supplied to the inner wall surface (inner peripheral wall surface 3a and outer peripheral wall surface 4a) of the annular hopper, for example, as described in Patent Document 1, the inner peripheral wall surface 3a and the outer peripheral wall surface 4a are combined. The cooling fluid can be supplied over a wide range in the radial direction including the central region between them, and the sinter 5 can be cooled more effectively.

In some embodiments, the plurality of nozzles 50 are configured such that the discharge amount of the cooling fluid differs depending on the radial position.

When the sinter 5 in the annular hopper 2 is cooled with the above-mentioned cooling air, a temperature distribution in the radial direction may occur in the sinter 5 in the annular hopper 2. For example, the temperature of the sinter 5 tends to be relatively low in the vicinity of the louvers (inner louver 7, outer louver 8 and central louver 9) through which cooling air easily flows. In this regard, according to the above-described embodiment, since a plurality of nozzles 50 are provided in the radial direction and the discharge amount of the cooling fluid can be adjusted according to the radial position, the discharge amount of the cooling fluid is set to that of the sintered ore 5. By appropriately adjusting the temperature according to the temperature distribution, the temperature of the sintered ore 5 after cooling can be made uniform in the radial direction.

In some embodiments, the plurality of nozzles 50 are located at the lower end of the annular hopper 2 in a central region of the opening region A1 from which the sintered ore 5 is discharged, including the central position Pc of the opening region A1 in the radial direction. discharge flow rate of the cooling fluid in Rc is, among the opening area A1, configured to be larger than the discharge flow rate of the cooling fluid in the end region R _E1, R _E2 positioned on both sides of the center region Rc in the radial direction (See FIGS. 7 to 10).

Here, the opening area A1 is an area occupied by the lower opening 2a that extends to the position of the lower end 4b of the outer peripheral wall surface 4a of the annular hopper 2 in the vertical direction. In the exemplary embodiment shown in FIGS. 7 and 8, the opening region A1 has a diameter and a region A1a extending between the inner peripheral wall surface 3a of the inner peripheral wall 3 and the inner peripheral side end surface 9a of the central louver 9 in the radial direction. The region A1b extending between the outer peripheral wall surface 4a of the outer peripheral wall 4 and the outer peripheral side end surface 9b of the central louver 9 and the region A1b extending in the direction is included. In the exemplary embodiment shown in FIGS. 9 and 10, the opening region A1 is a region extending between the outer peripheral wall surface 4a of the outer peripheral wall 4 and the inner peripheral wall surface 3a of the inner peripheral wall 3 in the radial direction.

Upon cooling the sintered ore 5 in the annular hopper 2 with the cooling air, of the opening area A1 of the lower end of the annular hopper 2, the central region Rc in the radial direction, than in the end regions R _E1, R _E2 in the radial direction The temperature of the sintered ore 5 tends to be high. In this regard, according to the above-described embodiment, the discharge flow rate of the cooling fluid in the central region Rc of the opening region A1 is set to be larger than the discharge flow rate of the cooling fluid in the _{end regions RE1} and _RE2. , The temperature of the sintered ore 5 after cooling can be made uniform in the radial direction.

In one embodiment, as shown in FIGS. 7 and 9, a plurality of nozzles 50 may be provided at substantially equal intervals in the radial direction (or in the longitudinal direction of the scraper 30). In this case, the discharge amount of the cooling fluid may be adjusted according to the radial position by making the nozzle diameters of the plurality of nozzles 50 different. For example, the nozzle diameter of the nozzle 50 provided at the radial position (for example, the above-mentioned central region Rc) where the discharge amount of the cooling fluid should be relatively large is set to be relatively large, and the discharge amount of the cooling fluid is relatively small. The nozzle diameter of the nozzle 50 provided at the power radial position (for example, the above-mentioned end regions _RE1 and _RE2 ) may be set to be relatively small.

Alternatively, in one embodiment, for example, as shown in FIG. 11, for a plurality of nozzles 50 arranged in the radial direction (or in the longitudinal direction of the scraper 30), as shown in FIG. 11, the cooling fluid is connected to the plurality of nozzles. A plurality of supply lines 64a to 64c and a plurality of valves 65a to 65c provided corresponding to the supply lines 64a to 64c are provided, and by adjusting the valves 65a to 65c, a plurality of nozzles 50 can be provided. The discharge amount from each may be adjusted.

In the exemplary embodiment shown in FIG. 11, the supply lines 64a to 64c are provided so as to branch from the supply line 62, and the plurality of nozzles 50 located in the central region Rc receive the cooling fluid from the supply line 64b. The cooling fluid is supplied from the supply line 64c and the supply line 64a to the plurality of nozzles 50 located in the end regions R _E1 and R _{E2 on both sides, respectively.}

In some embodiments, as described above, a single supply line 64 and valve 65 to a plurality of nozzles 50 belonging to the same region (central region Rc and end regions R _{E1, R} _E2) The supply line 64 and the valve 65 may be provided separately so as to correspond to each of the plurality of nozzles 50.

In one embodiment, the discharge amount of the cooling fluid may be adjusted according to the radial position by making the number densities of the plurality of nozzles 50 different according to the radial position. For example, in the exemplary embodiment shown in FIGS. 8 and 10, the number density of nozzles 50 in the central region Rc is larger than the number density of nozzles 50 in the _{end regions RE1} and _RE2. In this way, the discharge flow rate of the cooling fluid in the central region Rc can be adjusted to be larger than the discharge flow rate of the cooling fluid in the _{end regions RE1} and _RE2.

In some embodiments, the sinter cooling device 1 is a flow rate adjusting unit configured to adjust the discharge flow rate of the cooling fluid from the nozzle 50 according to the rotation phase of the annular hopper 2 or the rotary table 12. (Not shown). The flow rate adjusting unit is configured to adjust the discharge flow rate of the cooling fluid from the nozzle 50 based on the tachometer for detecting the rotation phase of the annular hopper 2 or the rotary table 12 and the detection result by the tachometer. The controller and the controller may be included. Further, the discharge flow rate of the cooling fluid from the nozzle 50 may be adjustable via a valve provided in the supply line for supplying the cooling fluid to the nozzle 50.

When the sinter 5 in the annular hopper 2 is cooled with cooling air, a temperature distribution in the circumferential direction may occur in the sinter 5 in the annular hopper 2, and this temperature distribution is arranged in the annular hopper 2. It tends to depend on the position of the structure. Here, the circumferential position of the structure in the annular hopper 2 and the rotational phase (for example, 0 to 360 degrees) of the annular hopper 2 or the rotary table 12 are related to each other.

For example, in the case of the cooling device 1 shown in FIGS. 1A and 1B, a plurality of ventilation ducts 11 are provided inside the annular hopper 2 at intervals in the circumferential direction. Therefore, in the circumferential direction, there may be a difference in the temperature of the sinter 5 between the position near the ventilation duct 11 and the position between the ventilation duct 11 and the ventilation duct 11.

In this regard, according to the above-described embodiment, the discharge flow rate of the cooling fluid can be adjusted according to the rotation phase of the annular hopper 2. Therefore, for example, the discharge amount of the cooling fluid is set to the position of the structure in the annular hopper 2. By appropriately adjusting the temperature accordingly, the temperature of the sintered ore 5 after cooling can be made uniform in the circumferential direction.

The outline of the sinter cooling device according to some embodiments will be described below.

(1) The sinter cooling device (1) according to at least one embodiment of the present invention is
A depository (for example, the above-mentioned annular hopper 2) having an internal space (6) for receiving the sinter (5) and a lower opening (2a) capable of discharging the sinter.
A rotary table (12) arranged below the deposit tank at a distance from the lower opening and configured to rotate together with the deposit tank.
A scraper (30) provided between the deposit tank and the rotary table, and
An exhaust hood (for example, the hood 18 described above) provided above the deposit tank so as to communicate with the internal space of the deposit tank.
A nozzle (50) provided below the lower opening and above the rotary table and configured to discharge the cooling fluid.
To be equipped.

According to the configuration of (1) above, since the nozzle capable of discharging the cooling fluid is provided below the lower opening of the deposit tank and above the rotary table, after being cooled by air inside the deposit tank. , The cooling fluid from the nozzle can be supplied to the sintered ore discharged from the lower opening. That is, since the cooling fluid from the nozzle is supplied to the sinter that has been cooled by air and the temperature has dropped to further cool the sinter, the sinter is further cooled while suppressing the occurrence of cracks due to quenching. Can be cooled sufficiently. Therefore, the cooling effect can be improved while suppressing the deterioration of the product quality.

(2) In some embodiments, in the configuration of (1) above,
The nozzle is configured to supply the cooling fluid to the downstream side of the scraper or above the scraper in the rotation direction of the rotary table.

According to the configuration of (2) above, since the nozzle for discharging the cooling fluid is provided on the downstream side of the scraper or above the scraper, the sinter is supplied to the sinter by the scraper after the cooling fluid is supplied to the sinter. It is possible to secure a relatively long time until it is scraped to the outside of the turntable. That is, the contact time between the sinter and the cooling fluid can be secured for a relatively long time, and thus the cooling effect of the sinter by the cooling fluid can be enhanced.

(3) In some embodiments, in the configuration of (1) or (2) above,
The nozzle is configured to supply the cooling fluid to the unloading region (Rd) on the downstream side of the scraper in the rotation direction of the rotary table.

The unloading area in the cooling device is the area immediately after the scraper on the downstream side of the scraper, and the sinter on the upper surface of the scraper moves downward toward the upper surface of the rotary table. In this regard, according to the configuration of (3) above, since the cooling fluid is supplied to the region where the sinter moves downward, the region where the sinter 5 is stationary in the vertical direction (for example, unloading) It is easier to supply the cooling fluid to more sinters than when the cooling fluid is supplied to the region downstream of the region). Further, since the cooling fluid is supplied to the region immediately after the scraper, the contact time between the sinter and the cooling fluid can be secured relatively long. This makes it possible to cool the sinter more effectively.

(4) In some embodiments, in any of the configurations (1) to (3) above,
The nozzle is configured to supply the cooling fluid to a region where the sinter deposited above the scraper can move downward.

According to the configuration of (4) above, the sinter deposited above the scraper supplies the cooling fluid to the region where it can move downward (the region immediately after the scraper in the rotational direction), so that the sinter is performed. It is easier to supply the cooling fluid to a larger amount of sinter as compared with the case where the cooling fluid is supplied to the region where the ore 5 is stationary in the vertical direction. Further, since the cooling fluid is supplied to the region immediately after the scraper, the contact time between the sinter and the cooling fluid can be secured relatively long. This makes it possible to cool the sinter more effectively.

(5) In some embodiments, in any of the configurations (1) to (4) above,
The nozzle is configured to supply the cooling fluid within a range in which the distance in the circumferential direction from the downstream end surface of the scraper is Hs or less, where Hs is the height of the scraper.

According to the configuration of (5) above, the region where the distance from the downstream end face of the scraper is within the range of Hs or less, that is, the region where the sinter deposited above the scraper can move downward (in the rotation direction). Since the cooling fluid is supplied to the region immediately after the scraper), more cooling fluid is cooled than when the cooling fluid is supplied to the region where the sinter 5 is stationary in the vertical direction. Easy to supply fluid. Further, since the cooling fluid is supplied to the region immediately after the scraper, the contact time between the sinter and the cooling fluid can be secured relatively long. This makes it possible to cool the sinter more effectively.

(6) In some embodiments, in any of the configurations (1) to (5) above,
The nozzle is supported by the scraper.

In a rotary cooling device, the scraper usually extends along a radial or radial direction and has an upper surface and a downstream end surface. In this regard, according to the configuration of (6) above, since the nozzle is supported by the scraper, the cooling fluid can be discharged to the area above the scraper or immediately after (downstream) the scraper in the rotation direction. The nozzle can be appropriately provided by utilizing a scraper.

(7) In some embodiments, in the configuration of (6) above,
The nozzle is configured to discharge the cooling fluid through an opening provided in the downstream end surface (30b) of the scraper.

According to the configuration of (7) above, the cooling fluid from the nozzle is discharged through the opening provided on the downstream end surface of the scraper, so that the contact between the nozzle and the sinter can be suppressed. As a result, it is possible to suppress the nozzle from being damaged or worn, or the nozzle from being blocked due to the adhesion of powder such as sinter.

(8) In some embodiments, in the configuration of (6) above,
The nozzle is provided above the scraper or at a position downstream of the scraper's downstream end surface in the rotational direction of the rotary table.

According to the configuration of (8) above, since the nozzle is provided above the scraper or at a position downstream of the downstream end surface of the scraper, the nozzle can be easily installed and the nozzle can be easily inspected. It can be carried out.

(9) In some embodiments, in any of the configurations (1) to (8) above,
The sinter cooling device
A protective cover (60) provided so as to cover the nozzle from above is provided.

According to the configuration of (9) above, since the protective cover that covers the nozzle from above is provided, it is possible to suppress the sinter located above the nozzle from coming into contact with the nozzle, and the impact of the sinter or the impact caused by the sinter can be prevented. The nozzle can be protected from wear.

(10) In some embodiments, in any of the configurations (1) to (9) above,
The sinter cooling device
A supply pipe (54) for supplying the cooling fluid to the nozzle is provided.
At least a part of the supply pipe is provided inside the scraper.

According to the configuration of (10) above, at least a part of the supply pipe for supplying the cooling fluid to the nozzle is provided inside the scraper, so that it is possible to prevent the sinter from coming into contact with the supply pipe. It can protect the supply pipe from the impact and wear caused by the sinter.

(11) In some embodiments, in any of the configurations (1) to (10) above,
The sinter cooling device
It includes a plurality of the nozzles arranged along the radial direction and configured so that the discharge amount of the cooling fluid differs depending on the radial position.

When the sinter in the sedimentary tank is cooled with cooling air, the sinter in the sedimentary tank may have a temperature distribution in the radial direction. In this regard, according to the configuration of (11) above, since a plurality of nozzles are provided in the radial direction and the discharge amount of the cooling fluid can be adjusted according to the radial position, the discharge amount of the cooling fluid can be adjusted to that of the sintered ore. By appropriately adjusting the temperature according to the temperature distribution, the temperature of the sintered ore after cooling can be made uniform in the radial direction.

(12) In some embodiments, in the configuration of (11) above,
A plurality of supply lines (64a to 64c) for supplying the cooling fluid to the plurality of nozzles, and
A plurality of valves (65a to 65c) provided in each of the plurality of supply lines and for adjusting the discharge amount from each of the plurality of nozzles, and
To be equipped.

According to the configuration of (12) above, the discharge amount of the cooling fluid can be appropriately adjusted according to the radial position by the plurality of supply lines and the valves provided in each of the plurality of supply lines. Thereby, by appropriately adjusting the discharge amount of the cooling fluid according to the temperature distribution of the sinter, the temperature of the sinter after cooling can be made uniform in the radial direction.

(13) In some embodiments, in the configuration of (11) above,
The number density of the plurality of nozzles differs depending on the radial position.

According to the configuration of (13) above, the number densities of the plurality of nozzles are made different according to the radial positions. Therefore, by appropriately setting the number densities of the nozzles at each radial position, the cooling fluid can be used. The discharge amount can be appropriately adjusted according to the radial position. Thereby, by appropriately adjusting the discharge amount of the cooling fluid according to the temperature distribution of the sinter, the temperature of the sinter after cooling can be made uniform in the radial direction.

(14) In some embodiments, in any of the configurations (11) to (13) above,
The plurality of nozzles are used for cooling in the central region (Rc) including the central position of the opening region in the radial direction in the opening region (A1) from which the sintered ore is discharged at the lower end of the deposit tank. The discharge flow rate of the fluid is configured to be larger than the discharge flow rate of the cooling fluid in _{the end regions (RE1} , _RE2 ) located on both sides of the central region in the radial direction in the opening region. NS.

When the sinter in the sinter is cooled with cooling air, the sinter in the sinter may have a radial temperature distribution. In the region, the temperature of the sinter tends to be higher than in the radial end region. In this regard, according to the configuration of (14) above, the discharge flow rate of the cooling fluid in the central region of the opening region is set to be larger than the discharge flow rate of the cooling fluid in the end region. The temperature of the ore can be made uniform in the radial direction.

(15) In some embodiments, in any of the configurations (1) to (14) above,
The sinter cooling device
The flow rate adjusting unit is provided so as to adjust the discharge flow rate of the cooling fluid from the nozzle according to the rotation phase of the deposit tank.

When the sinter in the sedimentary tank is cooled with cooling air, the sinter in the sedimentary tank may have a temperature distribution in the circumferential direction, and this temperature distribution is located at the position of the structure placed in the sedimentary tank. It tends to be compliant. In this regard, according to the configuration of (15) above, the discharge flow rate of the cooling fluid can be adjusted according to the rotation phase of the sedimentation tank. Therefore, for example, the discharge amount of the cooling fluid is set to the position of the structure in the sedimentation tank. By appropriately adjusting the temperature accordingly, the temperature of the sintered ore after cooling can be made uniform in the circumferential direction.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and includes a modified form of the above-described embodiments and a combination of these embodiments as appropriate.

In the present specification, expressions representing relative or absolute arrangements such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric" or "coaxial". Strictly represents not only such an arrangement, but also a tolerance or a state of relative displacement at an angle or distance to the extent that the same function can be obtained.
For example, expressions such as "same", "equal", and "homogeneous" that indicate that things are in the same state not only represent exactly the same state, but also have tolerances or differences to the extent that the same function can be obtained. It shall also represent the existing state.
Further, in the present specification, the expression representing a shape such as a quadrangular shape or a cylindrical shape not only represents a shape such as a quadrangular shape or a cylindrical shape in a geometrically strict sense, but also within a range in which the same effect can be obtained. , The shape including the uneven portion, the chamfered portion, etc. shall also be represented.
Further, in the present specification, the expression "comprising", "including", or "having" one component is not an exclusive expression excluding the existence of another component.

1 Cooling device 2 Circular hopper 2a Lower opening 3 Inner peripheral wall 3a Inner peripheral wall surface 4 Outer wall 4a Outer wall surface 4b Lower end 5 Sintered ore 6 Inner space 7 Inner louver 8 Outer louver 9 Central louver 9a Inner peripheral side end face 9b Outer peripheral side end face 10 Air cooling part 11 Ventilation duct 12 Rotating table 13 Foundation 14 Center bearing 15 Rail 16 Support roller 17 Drive motor 18 Hood 19 Exhaust duct 20 Blower 21 Frame 22 Frame 23 Seal part 24 Oke part 25 Sealing liquid 26 Sealing plate 27 Supply chute 29 Belt conveyor 30 Scraper 30a Upper surface 30b Downstream end surface 31 Tip surface 32 Upper side wall 33 Upstream wall 34 Downstream wall 35 Lower side wall 36 Inner space 37 Opening 40 Liner 41 Upper liner 42 Upstream liner 50 Nozzle 52 Nozzle hole 54 Supply Tube 60 Protective cover 62 Supply line 64 (64a to 64c) Supply line 65 (65a to 65c) Valve A1 Opening area O Central axis Pc Center position R _E1 End area R _E2 End area Rc Central area Rd Unloading area

Claims

An internal space for receiving the sinter and a sedimentary tank with a lower opening capable of discharging the sinter.
A rotary table, which is arranged below the deposit tank at a distance from the lower opening and is configured to rotate together with the deposit tank.
A scraper provided between the deposit tank and the rotary table,
An exhaust hood provided above the deposit tank so as to communicate with the internal space of the deposit tank.
A nozzle provided below the lower opening and above the rotary table and configured to discharge the cooling fluid.
Sinter cooling device equipped with.
The sinter cooling device according to claim 1, wherein the nozzle is configured to supply the cooling fluid to the downstream side of the scraper or above the scraper in the rotation direction of the rotary table.
The sinter cooling device according to claim 1 or 2, wherein the nozzle is configured to supply the cooling fluid to a unloading region on the downstream side of the scraper in the rotation direction of the rotary table.
The sinter according to any one of claims 1 to 3, wherein the nozzle is configured to supply the cooling fluid to a region where the sinter deposited above the scraper can move downward. Ore cooling system.
Claims 1 to 4 are configured such that the nozzle supplies the cooling fluid within a range in which the distance in the circumferential direction from the downstream end surface of the scraper is Hs or less when the height of the scraper is Hs. The sinter cooling device according to any one of the above items.
The sinter cooling device according to any one of claims 1 to 5, wherein the nozzle is supported by the scraper.
The sinter cooling device according to claim 6, wherein the nozzle is configured to discharge the cooling fluid through an opening provided on the downstream end surface of the scraper.
The sinter cooling device according to claim 6, wherein the nozzle is provided above the scraper or at a position downstream of the scraper's downstream end surface in the rotational direction of the rotary table.
The sinter cooling device according to any one of claims 1 to 8, further comprising a protective cover provided so as to cover the nozzle from above.
The nozzle is provided with a supply pipe for supplying the cooling fluid.
The sinter cooling device according to any one of claims 1 to 9, wherein at least a part of the supply pipe is provided inside the scraper.
The sinter according to any one of claims 1 to 10, further comprising a plurality of the nozzles arranged along the radial direction and configured such that the discharge amount of the cooling fluid differs depending on the radial position. Cooling system.
A plurality of supply lines for supplying the cooling fluid to the plurality of nozzles,
A plurality of valves provided in each of the plurality of supply lines for adjusting the discharge amount from each of the plurality of nozzles, and
The sinter cooling device according to claim 11.
The sinter cooling device according to claim 11, wherein the number densities of the plurality of nozzles differ depending on the radial position.
In the plurality of nozzles, at the lower end of the deposit tank, the discharge flow rate of the cooling fluid in the central region including the central position of the opening region in the radial direction among the opening regions where the sintered ore is discharged is determined. The invention according to any one of claims 11 to 13, wherein the opening region is configured to be larger than the discharge flow rate of the cooling fluid in the end regions located on both sides of the central region in the radial direction. Sintered ore cooling system.
The sinter according to any one of claims 1 to 14, further comprising a flow rate adjusting unit configured to adjust the discharge flow rate of the cooling fluid from the nozzle according to the rotation phase of the deposit tank. Cooling system.