Granulation Cooling Device and Granulation Cooling Method for Molten Material

Abstract

The present invention provides a granulation cooling device and a granulation cooling method for molten materials, including a granulation chamber; the granulation chamber includes a top cone structure and a lower cone structure connected to the bottom of the top cone structure; an air exhaust port is provided at the top end of the top cone structure, and a material guiding pipe is provided inside the air exhaust port; a rotating disk is provided inside the top cone structure; the center of the rotating disk is opposite to the bottom position of the material guiding pipe; a water-cooled wall is provided on the inner side wall of the top cone structure; the lower cone structure is arranged below the periphery of the rotating disk; the lower cone structure includes a middle ring section connected to the bottom end of the outer side wall of the top cone structure and a lower cone section connected to the middle ring section; the outer side wall of the lower cone section is inclined inwardly, and a discharge port is provided at the bottom of the lower cone section; an air inlet structure is provided on the outer side wall of the lower cone section; the air inlet structure is arranged between the air blowing port and the discharge port. By using the present invention, problems such as insufficient strength of current particle cooling or wall sticking phenomenon, resulting in product accumulation and remelting phenomenon, can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of material preparation, and more specifically, to a granulation cooling device and a granulation cooling method for molten materials. Background Art

[0002] The centrifugal granulation of molten materials includes the rotary disk (cup) method, which is a brand-new granulation treatment technology that has started to be researched in recent years and is still in the development stage. The main method is as follows:

[0003] The high-temperature melt is first transported to a high-speed rotating disk-shaped container. The rotating disk has a certain volume. The rotation of the rotating disk drives the melt in the disk to do circular motion. Under the action of centrifugal force, the melt will move in a climbing motion along the disk shape from the inside to the outside and follow the circular motion. When the melt reaches the edge of the rotating disk, it overcomes the viscous resistance by inertia and is thrown out at a high speed. The droplets fly and collide with the cooling wall of the granulation chamber and then fall downward. During the flight, they exchange heat with the surrounding air to form solid finished product particles. The droplets are cooled by radiation and air convection in the granulation chamber. The cooling wall of the granulation chamber has jacket water cooling. The finished product particles fall into the lower discharge port to complete the granulation process. Subsequently, a secondary cooling device continues to cool the particles to an appropriate temperature (a temperature suitable for storage).

[0004] The above granulation method has strict requirements for granulation conditions. The melt is thrown out from the rotating disk and granulated into droplets, which collide with the water-cooled wall of the granulation chamber and then fall downward. The residence time in the granulation chamber mainly depends on the residence time in the circumferential direction of the lower space of the granulation chamber. However, the method of controlling this time can only be adjusted limitedly by setting the opening of the discharge port, and this adjustment is restricted by many conditions, such as whether the discharge is smooth, whether the particles are piled up, and how to achieve on-line adjustment. This problem directly affects the stability of the granulation effect and the granulation quality. Due to insufficient cooling intensity of the particles or wall sticking phenomenon, larger particle size particles or large blocks are generated, further causing product accumulation and remelting phenomena. Summary of the Invention

[0005] In view of the above problems, the purpose of the present invention is to provide a granulation cooling device and a granulation cooling method for molten materials, so as to solve the problems that in the current granulation cooling process of the melt, due to insufficient cooling intensity of the slag particles or wall sticking phenomenon, larger particle size particles or large blocks are generated, resulting in product accumulation and remelting phenomena, etc.

[0006] The present invention provides a granulation cooling device for molten materials, including a granulation chamber; wherein, the granulation chamber includes a top cone structure and a lower cone structure connected to the bottom of the top cone structure; an air outlet is arranged at the top end of the top cone structure, and a material guiding pipe is arranged inside the air outlet; a rotating disk is arranged inside the top cone structure; the center of the rotating disk is opposite to the bottom position of the material guiding pipe; a water-cooled wall is arranged on the inner side wall of the top cone structure; the lower cone structure is arranged at the lower periphery of the rotating disk; the lower cone structure includes a middle ring section connected to the bottom end of the outer side wall of the top cone structure and a lower cone section connected to the middle ring section; wherein, the outer side wall of the middle ring section is vertically arranged, and at least one group of air blowing ports is arranged on the outer side wall of the middle ring section, and each group of air blowing ports includes at least two symmetrically arranged air blowing ports; the outer side wall of the lower cone section is inclined inward, and a material outlet is arranged at the bottom of the lower cone section; an air inlet structure is arranged on the outer side wall of the lower cone section; the air inlet structure is arranged between the air blowing ports and the material outlet.

[0007] In addition, a preferred solution is that the wall surface of the water-cooled wall is a conical surface.

[0008] In addition, a preferred solution is that the air outlet is arranged at the center of the top end of the top cone structure; the material guiding pipe is arranged in the middle of the air outlet.

[0009] In addition, a preferred solution is that the air inlet structure includes an air box arranged outside the lower cone section; wherein, an air inlet channel is arranged between the air box and the lower cone section, and a circle of at least 20 overlapping leaf plates is arranged on the side wall of the air box close to the lower cone section; and air inlet gaps are arranged between adjacent leaf plates; an air inlet is arranged on the side wall of the air box far from the lower cone section.

[0010] In addition, a preferred solution is that a cooling device is arranged at the bottom end of the rotating disk; and / or, a power device is connected to the bottom of the rotating disk.

[0011] In addition, a preferred solution is that the rotating direction of the rotating disk, the air inlet direction of the air blowing ports and the air inlet direction of the air inlet structure are all the same.

[0012] In addition, a preferred solution is that the horizontal distance from the center of the rotating disk to the wall surface of the water-cooled wall is 3 to 8 times the diameter of the rotating disk.

[0013] In addition, a preferred solution is that the rotation speed of the rotating disk is 800 rpm to 1500 rpm; and / or, the total air blowing volume entering from the air blowing ports is 1×10 4 m 3 / h to 1×10 5 m 3 / h; the wind speed entering from each tuyere is 20 m / s to 50 m / s.

[0014] In addition, a preferred solution is that the included angle between the wind direction of the wind blown in from the tuyere and the moving direction of the material thrown out from the turntable is 70° to 90°.

[0015] The granulation and cooling method of the molten material provided by the present invention granulates the molten material by using the granulation and cooling device of the molten material as described above, and includes the following steps:

[0016] S1. Introduce the molten material into the granulation chamber through the material guiding pipe, so that the molten material falls into the center of the turntable;

[0017] S2. Under the action of centrifugal force, the molten material falling into the center of the turntable flies out of the turntable along the edge of the turntable in a direction approximately tangent to the rotation of the turntable;

[0018] S3. The molten material flying out of the turntable impacts the water-cooled wall of the top cone structure to form fine molten droplets;

[0019] S4. The cyclone field formed by the wind entering from the tuyere cools the fine molten droplets, so that the fine molten droplets solidify into primary particles;

[0020] S5. The blocking wind field formed by the wind entering from the air inlet structure re-cools the primary particles, so that the primary particles are cooled for the second time to form cooled particles;

[0021] S6. The cooled particles are discharged from the discharge port to obtain solid particles after granulation and cooling.

[0022] As can be seen from the above technical solution, the granulation cooling device and method for molten materials provided by the present invention introduce the molten material into the granulation chamber through a material guiding pipe. The molten material falls onto a rotating disk, and the rotating disk rotates at a high speed. Under the action of centrifugal force, the molten material falling into the center of the rotating disk flies out of the rotating disk along the edge of the rotating disk in a direction approximately tangent to the rotation of the rotating disk, and impacts on the water-cooled wall of the top cone structure to form fine molten droplets. Under the action of the cyclone field formed by the air entering from the air blast opening, the fine molten droplets reach above the lower cone section of the granulation chamber. At this time, the droplets cool down due to heat dissipation, and the surface has hardened into primary particles. The inside of the primary particles may still be in a liquid state; the primary particles are affected by the material blocking air field formed by the air entering from the air inlet structure in the lower cone section, and the circumferential velocity of the primary particles is further increased, so that the particles stay in this area for a longer time. By controlling the velocity of the material blocking air field, the residence time of the primary particles in this area is controlled; due to the action of the material blocking air field, the primary particles have sufficient cooling intensity, cooling time and kinetic energy of motion, which can ensure that the particles do not stick to each other and can ensure appropriate temperature for discharging to the next process for cooling. Through the present invention, it is possible to solve the problems in the prior art during the granulation cooling process of the melt, such as large particle size particles or large blocks being generated due to insufficient cooling intensity of the particles or wall sticking phenomena, resulting in product accumulation and remelting phenomena, etc.

[0023] To achieve the above and related purposes, one or more aspects of the present invention include the features that will be described in detail later. The following description and the accompanying drawings illustrate certain exemplary aspects of the present invention in detail. However, these aspects only indicate some of the various ways in which the principles of the present invention can be used. In addition, the present invention is intended to include all these aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] By referring to the following description in conjunction with the accompanying drawings, and with a more comprehensive understanding of the present invention, other objects and results of the present invention will become more apparent and easier to understand. In the drawings:

[0025] Figure 1 is a schematic structural diagram of the granulation cooling device for molten materials according to an embodiment of the present invention;

[0026] Figure 2 is a top view structural diagram of the granulation cooling device for molten materials according to an embodiment of the present invention;

[0027] Figure 3 is a schematic cross-sectional structural diagram of the air inlet structure according to an embodiment of the present invention;

[0028] Figure 4 is a flowchart of the granulation cooling method for molten materials according to an embodiment of the present invention.

[0029] In the attached drawings, 1 - granulation chamber, 2 - top cone structure, 21 - air outlet, 211 - material guiding pipe, 22 - water-cooled wall, 3 - lower cone structure, 31 - middle ring section, 311 - air blowing port, 32 - lower cone section, 321 - discharge port, 33 - air inlet structure, 331 - air box, 332 - air inlet channel, 333 - vane, 334 - air inlet gap, 335 - air inlet, 4 - rotating disk, 5 - cooling device, 6 - power device.

[0030] In all the attached drawings, the same reference numerals indicate similar or corresponding features or functions. Detailed implementation manners

[0031] In the following description, for the purpose of illustration, in order to provide a comprehensive understanding of one or more embodiments, many specific details are set forth. However, it is obvious that these embodiments can also be implemented without these specific details.

[0032] Aiming at the problems mentioned above in the current melt granulation cooling process, such as insufficient particle cooling intensity or wall sticking phenomenon, resulting in larger particle size particles or large blocks, causing product accumulation and remelting phenomena, etc., a granulation cooling device and a granulation cooling method for molten materials are proposed.

[0033] The following will describe in detail the specific embodiments of the present invention with reference to the attached drawings.

[0034] In order to illustrate the granulation cooling device for molten materials provided by the present invention, Figure 1 the structure of the granulation cooling device for molten materials according to an embodiment of the present invention is shown; Figure 2 the top view structure of the granulation cooling device for molten materials according to an embodiment of the present invention is shown; Figure 3 the structure of the air inlet structure according to an embodiment of the present invention is shown.

[0035] As Figures 1 to 3As shown together, the granulation cooling device for molten materials provided by the present invention includes a granulation chamber 1; wherein, the granulation chamber 1 includes a top cone structure 2 and a lower cone structure 3 connected to the bottom of the top cone structure 2; an air outlet 21 is provided at the top of the top cone structure 2, and a material guiding pipe 211 is arranged inside the air outlet 21; a rotating disk 4 is arranged inside the top cone structure 2; the center of the rotating disk 4 is opposite to the bottom position of the material guiding pipe 211; a water-cooled wall 22 is arranged on the inner side wall of the top cone structure 2; the lower cone structure 3 is arranged at the periphery below the rotating disk 4; the lower cone structure 3 includes a middle ring section 31 connected to the bottom end of the outer side wall of the top cone structure 2 and a lower cone section 32 connected to the middle ring section 31; wherein, the outer side wall of the middle ring section 31 is vertically arranged, and at least one group of air blowing ports 311 is arranged on the outer side wall of the middle ring section 31, and each group of air blowing ports 311 includes at least two symmetrically arranged air blowing ports 311; the outer side wall of the lower cone section 32 is inclined inwards, and a discharge port 321 is arranged at the bottom of the lower cone section 32; an air inlet structure 33 is arranged on the outer side wall of the lower cone section 32; the air inlet structure 33 is arranged between the air blowing ports 311 and the discharge port 321.

[0036] Among them, the number of the air blowing ports 311 is mainly considered in terms of installation space, formation of the cyclone field, cost, etc., and can be set according to actual needs, and no special limitation is made here.

[0037] By introducing the molten material into the granulation chamber 1 through the material guiding pipe 211, the molten material falls onto the rotating disk 4. The rotating disk 4 rotates at a high speed, so that the molten material falling into the center of the rotating disk 4 flies out of the rotating disk 4 along the edge of the rotating disk 4 in a direction approximately tangent to the rotation of the rotating disk 4 under the action of centrifugal force, and impacts on the water-cooled wall 22 of the top cone structure 2 to form fine molten droplets. The fine molten droplets reach above the lower cone section 32 of the granulation chamber under the action of the cyclone field formed by the air entering through the air blowing ports 311. At this time, the droplets have cooled and hardened on the surface to become primary particles due to heat dissipation, and the inside of the primary particles may still be in a liquid state; the primary particles are affected by the material blocking air field formed by the air entering through the air inlet structure 33 of the lower cone section 32, and the circumferential speed of the primary particles is further increased, so that the particles stay in this area for a longer time. By controlling the speed of the material blocking air field, the residence time of the primary particles in this area is controlled; due to the action of the material blocking air field, the primary particles have sufficient cooling intensity, cooling time and kinetic energy of movement, which can ensure that the particles do not stick to each other and can ensure that the appropriate temperature is discharged to the next process for cooling. Through the present invention, it is possible to solve the problems in the prior art during the granulation cooling process of the melt, such as the formation of larger particle sizes or large blocks due to insufficient cooling intensity of the particles or wall sticking phenomenon, resulting in product accumulation and remelting phenomena.

[0038] As a preferred solution of the present invention, the wall surface of the water-cooled wall 22 is a conical surface. This can prevent the splashing molten material from sticking to the water-cooled wall 22 and is conducive to the formation of fine molten droplets.

[0039] As a preferred embodiment of the present invention, the exhaust port 21 is provided at the center of the top of the top cone structure 2; the material guiding pipe 211 is provided in the middle of the exhaust port 21. Through the above structural design, the overall structure is more symmetrical, and the space where the molten material acts under the action of the cyclone field is more reasonable.

[0040] As a preferred embodiment of the present invention, the air inlet structure 33 includes an air box 331 provided on the outer side of the lower cone section 32; wherein, an air inlet channel 332 is provided between the air box 331 and the lower cone section 32, and a circle of at least 20 overlapping leaf plates 333 is provided on the side wall of the air box 331 close to the lower cone section 32; and an air inlet gap 334 is provided between adjacent leaf plates 333; an air inlet 335 is provided on the side wall of the air box 331 far from the lower cone section 32. Through the above design, the air entering the air box 331 from the air inlet 335 enters the lower cone section 32 through the air inlet gap 334, forming a material-blocking air field, and the residence time of the primary particles in this area is controlled by controlling the speed of the material-blocking air field; the design of the leaf plates 333 facilitates the control of the air volume and air direction of the material-blocking air field.

[0041] As a preferred embodiment of the present invention, a cooling device 5 is provided at the bottom end of the turntable 4; and / or, a power device 6 is connected to the bottom of the turntable 4. By providing the cooling device 5 to cool the turntable 4, the molten material falling into the center of the turntable 4 is cooled; the power device 6 provides the power for the high-speed rotation of the turntable 4, and preferably, the power device is a motor.

[0042] As a preferred embodiment of the present invention, the rotation direction of the turntable 4, the air inlet direction of the air blowing port 311, and the air inlet direction of the air inlet structure 33 are all the same. It is convenient to completely solidify the particles formed by the molten material and improve the uniformity of the particles.

[0043] As a preferred embodiment of the present invention, the horizontal distance from the center of the turntable 4 to the wall surface of the water-cooled wall 22 is 3 to 8 times the diameter of the turntable 4. Within this range, it is beneficial to impact the molten material falling into the turntable 4 against the water-cooled wall.

[0044] As a preferred embodiment of the present invention, the rotation speed of the turntable 4 is 800 rpm to 1500 rpm; and / or, the total air volume entering from the air blowing ports 311 is 1×10 4 m 3 / h to 1×10 5 m 3 / h; the air speed entering from each air blowing port 311 is 20 m / s to 50 m / s. The turntable 4 needs to rotate at a high speed to generate sufficient centrifugal force on the molten material so that the molten material flies out along the tangent direction of the rotation of the turntable 4; only when the air volume reaches a sufficient level and the air speed entering each air blowing port 311 meets certain requirements can a cyclone field be formed in the middle ring section 31.

[0045] As a preferred embodiment of the present invention, the included angle between the wind direction of the air blown in from the air inlet 311 and the moving direction of the material thrown out from the turntable 4 is 70° to 90°. This is the preferred angle. Through the above angle design, it is possible to prevent the molten material from hitting the inner wall of the middle ring section 31 under the action of the cyclone field.

[0046] Figure 4 The flowchart of the granulation and cooling method of the molten material according to an embodiment of the present invention is shown.

[0047] As Figure 4 shown, the granulation and cooling method of the molten material provided by the present invention granulates the molten material by using the granulation and cooling device of the molten material as described above, and includes the following steps:

[0048] S1. Introduce the molten material into the granulation chamber through the material guide pipe, so that the molten material falls into the center of the turntable;

[0049] S2. Under the action of centrifugal force, the molten material falling into the center of the turntable flies out of the turntable along the edge of the turntable in a direction approximately tangent to the rotation of the turntable;

[0050] S3. The molten material flying out of the turntable hits the water-cooled wall of the top cone structure to form fine molten droplets;

[0051] S4. Cool the fine molten droplets by the cyclone field formed by the air entering through the air inlet, so that the fine molten droplets solidify into primary particles;

[0052] S5. Re-cool the primary particles by the material-blocking wind field formed by the air entering through the air inlet structure, so that the primary particles are cooled for the second time to form cooled particles;

[0053] S6. Discharge the cooled particles from the discharge port to obtain the solid particles after granulation and cooling.

[0054] To further illustrate the practical application of the invention, a preferred embodiment of the present invention is as follows:

[0055] Example 1

[0056] S1. Introduce 1400°C blast furnace slag into the granulation chamber through a feed pipe at a treatment rate of 20 t / h, so that the blast furnace slag falls into the center of the rotating disk. Among them, the rotation speed of the rotating disk is 800 - 1500 rpm. The rotating disk is located at the center of the granulation chamber. The droplets thrown out from the rotating disk first reach the wall surface of the water-cooled wall. The distance from the center of the rotating disk to the wall surface of the water-cooled wall in the horizontal direction is set to 3 - 8 times the diameter of the rotating disk. In this embodiment, it is preferably set that the horizontal distance from the center of the rotating disk to the wall surface of the cooling wall is 3 times the diameter of the rotating disk. In order to ensure that the droplets do not adhere to the wall surface of the water-cooled wall, in addition to keeping it smooth and at a low temperature, the angle at which the droplets collide with it is also set, that is, the cone apex angle of the wall surface of the water-cooled wall is controlled. The cone apex angle set in this embodiment is 120°.

[0057] S2. Under the action of centrifugal force, the molten material falling into the center of the rotating disk flies out of the rotating disk along the edge of the rotating disk in a direction approximately tangent to the rotation of the rotating disk.

[0058] S3. The molten material flying out of the rotating disk impacts on the water-cooled wall of the top cone structure, forming fine droplets.

[0059] S4. The cyclone field formed by the air entering from the tuyere cools the fine droplets, causing the fine droplets to solidify into primary particles. Among them, the wind speed at the tuyere is set to 20 - 50 m / s, and a total of 20 tuyeres are set. The angle A (the included angle between the wind direction and the droplet movement direction) is set to 70° - 90°. In this embodiment, it is preferably set to 80°.

[0060] S5. The blocking air field formed by the air entering from the air inlet structure re-cools the primary particles, causing the primary particles to be cooled for the second time and forming cooled particles. Among them,

[0061] The key lies in the residence time of the particles in the granulation chamber. The distance that the droplet collides with the wall of the cooling wall and reaches the lower cone section downward is set as m. From this point, it expands outward by a distance of n. The cylindrical surface passing through this point with the center of the granulation chamber as the axis intersects the wall surfaces of the lower cone section and the cooling section, and the middle cylindrical surface is the middle ring section. Generally, the value range of m is 3 times the diameter of the turntable ± 200 mm, and the value range of n is the radius of the turntable ± 50 mm. The cone apex angle of the lower cone section is 130° ± 20°. When setting the length of the lower cone section, it is necessary to consider that the particles colliding downward from the wall surface of the water-cooled wall do not directly fall into the discharge port. Therefore, the possible emission angle B of the droplets ejected from the turntable is used as the control parameter, and the value range of angle B is 15° ± 5°. Under ideal collision conditions, the point where the droplet particles reach the surface of the lower cone is used as the outer ring of the discharge port. In this embodiment, it is set in the granulation chamber. The distance that the droplet collides with the wall of the water-cooled wall and reaches the lower cone section downward is 1500 mm, the expansion distance n = 250 mm, the cone apex angle of the lower cone section is 140°, the possible emission angle of the droplet is 15°, the inner diameter of the corresponding middle ring section is 5000 mm, the outer diameter of the discharge port is 3145 mm, and the inner diameter is 2345 mm. The total air volume of the blocking air is 10000 - 15000 M3 / h, which is evenly distributed into 8 air boxes through 8 air inlets. There are a total of 60 leaf plates in the lower cone section, and the gaps between each leaf plate are set so that the blocking air velocity can reach 20 - 50 m / s..

[0062] S6. The cooled particles are discharged from the discharge port to obtain the granulated and cooled molten material.

[0063] It can be seen from the above specific implementation manners that for the granulation cooling device and granulation cooling method of the molten material provided by the present invention, the molten material is introduced into the granulation chamber through the guide pipe. The molten material falls onto the turntable, and the turntable rotates at a high speed, so that the molten material falling into the center of the turntable flies out of the turntable along the edge of the turntable in a direction approximately tangent to the rotation of the turntable under the action of centrifugal force, and impacts on the water-cooled wall of the top cone structure to form fine molten droplets. The fine molten droplets reach above the lower cone section of the granulation chamber under the action of the cyclone field formed by the air entering from the air inlet of the tuyere. At this time, the droplets have cooled and hardened on the surface to become primary particles due to heat dissipation, and the inside of the primary particles may still be liquid; the primary particles are affected by the blocking air field formed by the air entering from the air inlet structure in the lower cone section, and the circumferential velocity of the primary particles is further increased, so that the particles stay in this area for a long time, and the residence time of the primary particles in this area is controlled by controlling the velocity of the blocking air field; due to the action of the blocking air field, the primary particles have sufficient cooling intensity, cooling time and kinetic energy of movement, which can ensure that the particles do not stick to each other and can ensure the appropriate temperature for discharging to the next process for cooling. Through the present invention, it is possible to solve the problems in the prior art during the granulation cooling process of the melt, such as the insufficient cooling intensity of the particles or the phenomenon of sticking to the wall, resulting in the generation of larger particle sizes or large blocks, causing product accumulation and remelting phenomena, etc.

[0064] The granulation cooling device and granulation cooling method of molten materials according to the present invention have been described above by way of example with reference to the accompanying drawings. However, those skilled in the art should understand that various improvements can be made to the granulation cooling device and granulation cooling method of molten materials proposed by the present invention above without departing from the content of the present invention. Therefore, the protection scope of the present invention should be determined by the content of the appended claims.

Claims

1. A granulation cooling device for molten materials, characterized in that, it includes a granulation chamber; wherein, the granulation chamber includes a top cone structure and a lower cone structure connected to the bottom of the top cone structure; an air outlet is provided at the top end of the top cone structure, and a material guiding pipe is provided inside the air outlet; a rotating disk is provided inside the top cone structure; the center of the rotating disk is opposite to the bottom position of the material guiding pipe; a water-cooled wall is provided on the inner side wall of the top cone structure; the lower cone structure is arranged around the lower part of the rotating disk; the lower cone structure includes a middle ring section connected to the bottom end of the outer side wall of the top cone structure and a lower cone section connected to the middle ring section; wherein, the outer side wall of the middle ring section is vertically arranged, and at least one group of air blowing ports is provided on the outer side wall of the middle ring section, wherein each group of air blowing ports includes at least two symmetrically arranged air blowing ports; wherein, the included angle between the wind direction of the wind blown in by the air blowing ports and the movement direction of the material thrown out from the rotating disk is 70° to 90°; the outer side wall of the lower cone section is inclined inward, and a discharge port is provided at the bottom of the lower cone section; an air inlet structure is provided on the outer side wall of the lower cone section; the air inlet structure is arranged between the air blowing ports and the discharge port; the air inlet structure includes an air box arranged outside the lower cone section; wherein, an air inlet channel is provided between the air box and the lower cone section, and a circle of at least 20 overlapping leaf plates is provided on the side wall of the air box close to the lower cone section; and an air inlet gap is provided between adjacent leaf plates; an air inlet is provided on the side wall of the air box far from the lower cone section.

2. The granulation cooling device for molten materials according to claim 1, characterized in that, the wall surface of the water-cooled wall is a conical surface.

3. The granulation cooling device for molten materials according to claim 1, characterized in that, the air outlet is arranged at the center of the top end of the top cone structure; the material guiding pipe is arranged in the middle of the air outlet.

4. The granulation cooling device for molten materials according to claim 1, characterized in that, a cooling device is provided at the bottom end of the rotating disk; and / or, a power device is connected to the bottom of the rotating disk.

5. The granulation cooling device for molten materials according to claim 1, characterized in that, the rotating direction of the rotating disk, the air inlet wind direction of the air blowing ports and the air inlet wind direction of the air inlet structure are all the same.

6. The granulation cooling device for molten materials according to claim 1, characterized in that, the horizontal distance from the center of the rotating disk to the wall surface of the water-cooled wall is 3 to 8 times the diameter of the rotating disk.

7. The granulation cooling device for molten materials according to claim 1, characterized in that, the rotation speed of the rotating disk is 800 rpm to 1500 rpm; and / or, The total blast volume entering from the blast tuyere is 1×10 4 m³ / h to 1×10 5 m³ / h; the wind speed entering from each air blowing port is 20 m / s to 50 m / s.

8. A granulation cooling method for molten materials, characterized in that, using the granulation cooling device for molten materials according to any one of claims 1-7 to granulate the molten materials, including the following steps: S1. Introduce the molten material into the granulation chamber through the material guiding pipe, so that the molten material falls into the center of the turntable; S2. Under the action of centrifugal force, the molten material falling into the center of the turntable flies out of the turntable along the edge of the turntable in a direction approximately tangent to the rotation of the turntable; S3. The molten material flying out of the turntable impacts on the water-cooled wall of the top cone structure to form fine droplets; S4. The cyclone field formed by the air entering from the air inlet blows cools the fine droplets, so that the fine droplets solidify into primary particles; S5. The blocking air field formed by the air entering from the air inlet structure re-cools the primary particles, so that the primary particles are cooled again to form cooled particles; S6. The cooled particles are discharged from the discharge port to obtain solid particles after granulation and cooling.

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