CN112808161A - Granulation cooling device and granulation cooling method for molten material - Google Patents
Granulation cooling device and granulation cooling method for molten material Download PDFInfo
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- CN112808161A CN112808161A CN202011613155.4A CN202011613155A CN112808161A CN 112808161 A CN112808161 A CN 112808161A CN 202011613155 A CN202011613155 A CN 202011613155A CN 112808161 A CN112808161 A CN 112808161A
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- 238000001816 cooling Methods 0.000 title claims abstract description 87
- 239000012768 molten material Substances 0.000 title claims abstract description 69
- 238000005469 granulation Methods 0.000 title claims abstract description 21
- 230000003179 granulation Effects 0.000 title claims abstract description 20
- 239000002245 particle Substances 0.000 claims abstract description 46
- 239000000463 material Substances 0.000 claims abstract description 36
- 239000011164 primary particle Substances 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 19
- 230000000903 blocking effect Effects 0.000 claims description 16
- 230000009471 action Effects 0.000 claims description 13
- 238000007599 discharging Methods 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 4
- 238000009825 accumulation Methods 0.000 abstract description 7
- 239000003570 air Substances 0.000 description 46
- 239000007788 liquid Substances 0.000 description 18
- 230000008569 process Effects 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 239000000155 melt Substances 0.000 description 7
- 230000017525 heat dissipation Effects 0.000 description 3
- 238000007909 melt granulation Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/02—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops
- B01J2/04—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops in a gaseous medium
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- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The invention provides a granulating and cooling device and a granulating and cooling method for molten materials, which comprise a granulating chamber; the granulation chamber comprises a tip cone structure and a lower cone structure connected with the bottom of the tip cone structure; an air outlet is arranged at the top end of the tip cone structure, and a material guide pipe is arranged inside the air outlet; a turntable is arranged in the tip cone structure; the center of the rotating disc is opposite to the bottom of the material guide pipe; a water-cooled wall is arranged on the inner side wall of the tip cone structure; the lower cone structure is arranged on the periphery below the turntable; the lower cone structure comprises a middle ring section connected with the bottom end of the outer side wall of the top cone structure and a lower cone section connected with the middle ring section; the outer side wall of the lower conical section is inclined inwards, and a discharge hole is formed in the bottom of the lower conical section; an air inlet structure is arranged on the outer side wall of the lower conical section; the air inlet structure is arranged between the blast port and the discharge port. The invention can solve the problems of product accumulation, remelting and the like caused by insufficient strength of particle cooling or wall adhesion at present.
Description
Technical Field
The invention relates to the technical field of material preparation, in particular to a granulating and cooling device and a granulating and cooling method for a molten material.
Background
Centrifugal granulation of molten materials, including the rotary disc (cup) method, is a completely new granulation process technology which has been studied and is in development stage in recent years, mainly as follows:
the high-temperature melt is firstly conveyed to a disc-shaped container rotating at a high speed, the rotating disc has a certain volume, the rotation of the rotating disc drives the melt in the rotating disc to do circular motion, the melt can do climbing motion along the disc shape from inside to outside under the action of centrifugal force and do follow circular motion, when the melt reaches the edge of the rotating disc, the melt is thrown out at a high speed by overcoming viscous resistance through inertia, liquid drops fly downwards after colliding with a cooling wall of a granulating chamber, and solid finished product particles are formed after heat exchange with ambient air in the flying process. The liquid drops are cooled in the granulating chamber by radiation and air convection, the cooling wall of the granulating chamber is cooled by jacket water, and the finished product particles fall into a discharge outlet at the lower part to finish the granulating process. A secondary cooling device is then provided to continue cooling the pellets to the appropriate temperature (suitable for storage).
The granulating mode has strict requirements on granulating conditions, the melt is thrown out of the rotary disc and granulated into liquid drops, the liquid drops reach the water-cooled wall of the granulating chamber and collide downwards, the residence time in the granulating chamber mainly depends on the residence time in the circumferential direction of the lower space of the granulating chamber, but the method for controlling the time only can be limited by the arrangement of the opening of the discharge port, and the adjustment is limited by various conditions, such as whether the discharge is smooth, whether the particles are accumulated, how to realize on-line adjustment and the like. This problem directly affects the stabilization of the granulation effect and the granulation quality. Because the cooling strength of the particles is not enough or the wall sticking phenomenon occurs, particles or blocks with larger particle size are generated, and the phenomenon of product accumulation and remelting is further caused.
Disclosure of Invention
In view of the above problems, the present invention provides a granulating and cooling device and a granulating and cooling method for molten materials, so as to solve the problems of product accumulation, remelting and the like caused by large-particle-size particles or large blocks due to insufficient cooling strength of slag particles or wall sticking phenomenon during the current granulating and cooling process of melts.
The invention provides a granulating and cooling device for molten materials, which comprises a granulating chamber; wherein the granulation chamber comprises a tip cone structure and a lower cone structure connected with the bottom of the tip cone structure; an air outlet is formed in the top end of the tip cone structure, and a material guide pipe is arranged inside the air outlet; a turntable is arranged in the tip cone structure; the center of the rotating disc is opposite to the bottom of the material guide pipe; a water-cooled wall is arranged on the inner side wall of the tip cone structure; the lower cone structure is arranged on the periphery below the turntable; the lower cone structure comprises a middle ring section connected with the bottom end of the outer side wall of the top cone structure and a lower cone section connected with the middle ring section; the outer side wall of the middle ring section is vertically arranged, and at least one group of blast ports is arranged on the outer side wall of the middle ring section, wherein each group of blast ports at least comprises two blast ports which are symmetrically arranged; the outer side wall of the lower conical section is arranged in an inward inclined manner, and a discharge hole is formed in the bottom of the lower conical section; an air inlet structure is arranged on the outer side wall of the lower conical section; the air inlet structure is arranged between the blast port and the discharge port.
In addition, preferably, the wall surface of the water wall is a conical surface.
In addition, preferably, the air outlet is arranged at the center of the top end of the tip cone structure; the material guide pipe is arranged in the middle of the air outlet.
In addition, the preferable scheme is that the air inlet structure comprises an air box arranged on the outer side of the lower conical section; an air inlet channel is arranged between the air box and the lower conical section, and a circle of at least 20 mutually overlapped fender plates are arranged on the side wall of the air box close to one side of the lower conical section; and an air inlet gap is arranged between the adjacent fender boards; and an air inlet is formed in the side wall of one side of the air box, which is far away from the lower conical section.
In addition, the bottom end of the rotating disc is preferably provided with a cooling device; and/or a power device is connected to the bottom of the rotating disc.
In addition, the preferred scheme is that the rotating direction of the rotary disc, the air inlet direction of the air outlet and the air inlet direction of the air inlet structure are the same.
In addition, the preferable scheme is that the horizontal distance from the center of the rotary table to the wall surface of the water cooling wall is 3-8 times of the diameter of the rotary table.
In addition, the rotating speed of the rotating disc is preferably 800rpm to 1500 rpm; and/or the total blast quantity entering from the blast opening is 1X104m3/h～1X105m3H; the wind speed entering from each blast port is 20 m/s-50 m/s.
In addition, the preferable proposal is that the included angle between the wind direction of the wind blown from the blast nozzle and the motion direction of the material thrown from the turntable is 70-90 degrees
The method for granulating and cooling the molten material, which is provided by the invention, by utilizing the granulating and cooling device for the molten material, comprises the following steps:
s1, introducing the molten material into the granulating chamber through the material guide pipe, and enabling the molten material to fall into the center of the rotary table;
s2, under the action of centrifugal force, the molten material falling into the center of the rotating disc flies out of the rotating disc along the edge of the rotating disc in the direction similar to the rotating tangential direction of the rotating disc;
s3, enabling the molten material flying out of the rotating disc to impact on the water-cooled wall of the tip cone structure to form fine molten drops;
s4, cooling the fine molten drops by a cyclone field formed by wind entering from the blast nozzle, and solidifying the fine molten drops into primary particles;
s5, re-cooling the primary particles by a material blocking wind field formed by wind entering the wind inlet structure, and secondarily cooling the primary particles to form cooled particles;
and S6, discharging the cooled particles from the discharge hole to obtain granulated and cooled solid particles.
According to the technical scheme, the molten material is guided into the granulating chamber through the material guide pipe, the molten material falls into the rotary table, the rotary table runs at a high speed, so that the molten material falling into the center of the rotary table flies out of the rotary table along the edge of the rotary table in a direction similar to the rotating tangential line of the rotary table under the action of centrifugal force and impacts on the water-cooled wall of the top cone structure to form fine molten drops, the fine molten drops reach the upper part of the lower cone section of the granulating chamber under the action of a cyclone field formed by wind entering from a blast hole, at the moment, the surface of the liquid drops is hardened into primary particles due to heat dissipation and temperature reduction, and the inner parts of the primary particles can still be in a liquid state; the primary particles are acted by a material blocking wind field formed by wind entering from the wind inlet structure of the lower conical section, the circumferential speed of the primary particles is further increased, so that the particles stay in the region for a longer time, and the stay time of the primary particles in the region is controlled by controlling the speed of the material blocking wind field; as the primary particles have enough cooling strength, cooling time and kinetic energy, the particles are prevented from being adhered and the particles are cooled by discharging the particles to the next procedure at proper temperature. The invention can solve the problems of product accumulation, remelting and the like caused by larger particle size particles or large blocks due to insufficient cooling strength of the particles or wall adhesion in the melt granulation cooling process in the prior art.
To the accomplishment of the foregoing and related ends, one or more aspects of the invention comprise the features hereinafter fully described. The following description and the annexed drawings set forth in detail certain illustrative aspects of the invention. These aspects are indicative, however, of but a few of the various ways in which the principles of the invention may be employed. Further, the present invention is intended to include all such aspects and their equivalents.
Drawings
Other objects and results of the present invention will become more apparent and more readily appreciated as the same becomes better understood by reference to the following description taken in conjunction with the accompanying drawings. In the drawings:
FIG. 1 is a schematic structural view of a granulating and cooling apparatus for molten material according to an embodiment of the present invention;
FIG. 2 is a schematic top view of a granulating and cooling apparatus for molten material according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of an air intake structure according to an embodiment of the present invention;
fig. 4 is a flowchart of a method of granulating cooling of a molten material according to an embodiment of the present invention.
In the attached figure, 1-granulation chamber, 2-tip cone structure, 21-air outlet, 211-material guide pipe, 22-water cooling wall, 3-lower cone structure, 31-middle ring section, 311-blast opening, 32-lower cone section, 321-material outlet, 33-air inlet structure, 331-air box, 332-air inlet channel, 333-fender, 334-air inlet gap, 335-air inlet, 4-rotary table, 5-cooling device and 6-power device.
The same reference numbers in all figures indicate similar or corresponding features or functions.
Detailed Description
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details.
Aiming at the problems that the prior granulating and cooling process of the melt generates larger-grain-size grains or large blocks due to insufficient cooling strength of the grains or wall sticking phenomenon, so as to cause product accumulation, remelting and the like, the granulating and cooling device and the granulating and cooling method of the molten material are provided.
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In order to explain the granulation cooling device of molten material provided by the present invention, fig. 1 shows the structure of the granulation cooling device of molten material according to the embodiment of the present invention; FIG. 2 shows a top view structural representation of a granulated cooling device of molten material according to an embodiment of the invention; fig. 3 shows the structure of the air intake structure according to the embodiment of the present invention.
As shown in fig. 1 to 3 in common, the present invention provides a granulation cooling device for molten material, comprising a granulation chamber 1; wherein, the granulation chamber 1 comprises a tip cone structure 2 and a lower cone structure 3 connected with the bottom of the tip cone structure 2; an air outlet 21 is arranged at the top end of the tip cone structure 2, and a material guide pipe 211 is arranged inside the air outlet 21; a turntable 4 is arranged in the tip cone structure 2; the center of the rotating disc 4 is opposite to the bottom of the material guide pipe 211; a water-cooled wall 22 is arranged on the inner side wall of the tip cone structure 2; the lower cone structure 3 is arranged on the periphery below the rotary table 4; the lower cone structure 3 comprises a middle ring section 31 connected with the bottom end of the outer side wall of the top cone structure 2 and a lower cone section 32 connected with the middle ring section 31; wherein, the outer side wall of the middle section 31 is vertically arranged, and at least one group of blast ports 311 is arranged on the outer side wall of the middle section 31, wherein each group of blast ports 311 at least comprises two blast ports 311 symmetrically arranged in position; the outer side wall of the lower conical section 32 is inclined inwards, and a discharge hole 321 is formed in the bottom of the lower conical section 32; an air inlet structure 33 is arranged on the outer side wall of the lower conical section 32; the air intake structure 33 is disposed between the air blowing port 311 and the discharge port 321.
The number of the blast ports 311 is mainly determined by considering an installation space, formation of a cyclone field, cost, and the like, and may be set according to actual needs, and is not particularly limited herein.
The molten material is guided into the granulating chamber 1 through the material guide pipe 211, the molten material falls into the rotary table 4, the rotary table 4 runs at a high speed, the molten material falling into the center of the rotary table 4 flies out of the rotary table 4 along the edge of the rotary table 4 in a direction similar to the rotation tangent line of the rotary table 4 under the action of centrifugal force, the molten material impacts on the water-cooled wall 22 of the top cone structure 2 to form fine molten drops, the fine molten drops reach the upper part of the lower cone section 32 of the granulating chamber under the action of a cyclone field formed by wind entering from a blast opening 311, at the moment, the surface of the liquid drops is hardened into primary particles due to heat dissipation and temperature reduction, and the inner parts of the; the primary particles are acted by a material blocking wind field formed by wind entering from the wind inlet structure 33 of the lower conical section 32, the circumferential speed of the primary particles is further increased, so that the particles stay in the region for a longer time, and the stay time of the primary particles in the region is controlled by controlling the speed of the material blocking wind field; as the primary particles have enough cooling strength, cooling time and kinetic energy, the particles are prevented from being adhered and the particles are cooled by discharging the particles to the next procedure at proper temperature. The invention can solve the problems of product accumulation, remelting and the like caused by larger particle size particles or large blocks due to insufficient cooling strength of the particles or wall adhesion in the melt granulation cooling process in the prior art.
In a preferred embodiment of the present invention, the wall surface of the waterwall 22 is a conical surface. Preventing the splattered molten material from sticking to the water cooled wall 22 facilitates the formation of fine droplets.
As a preferable scheme of the present invention, the air outlet 21 is arranged at the center of the top end of the tip cone structure 2; the guide pipe 211 is provided at the middle of the exhaust outlet 21. Through the structural design, the integral structure is more symmetrical, and the space of the molten material under the action of the cyclone field is more reasonable.
As a preferable aspect of the present invention, the air intake structure 33 includes an air box 331 disposed outside the lower cone section 32; an air inlet channel 332 is arranged between the air box 331 and the lower conical section 32, and a circle of at least 20 mutually overlapped lappets 333 are arranged on the side wall of the air box 331 close to one side of the lower conical section 32; an air inlet gap 334 is arranged between the adjacent fender 333; an air inlet 335 is arranged on the side wall of the bellows 331 on the side remote from the lower cone portion 32. Through the design, the wind entering the wind box 331 from the wind inlet 335 enters the lower cone section 32 from the wind inlet gap 334 to form a material blocking wind field, and the residence time of primary particles in the region is controlled by controlling the speed of the material blocking wind field; the design of the fender 333 is convenient for controlling the air quantity and the air direction of the material blocking wind field.
As a preferable scheme of the invention, a cooling device 5 is arranged at the bottom end of the rotating disc 4; and/or a power device 6 is connected to the bottom of the rotating disc 4. The cooling device 5 is arranged to cool the rotary table 4 and cool the molten material falling into the center of the rotary table 4; the turntable 4 is powered by a power unit 6, preferably an electric motor, for high speed operation.
In a preferred embodiment of the present invention, the rotation direction of the turntable 4, the wind direction of the wind from the air inlet 311, and the wind direction of the wind from the wind inlet structure 33 are the same. The particles formed by the molten material can be completely solidified, and the uniformity of the particles is improved.
In a preferred embodiment of the present invention, the horizontal distance from the center of the turntable 4 to the wall surface of the water wall 22 is 3 to 8 times the diameter of the turntable 4. In this range, water wall impingement of the molten material falling into the rotating disk 4 is facilitated.
As a preferable scheme of the invention, the rotating speed of the rotating disc 4 is 800 rpm-1500 rpm; and/or the total blast volume from the blast port 311 is 1X104m3/h～1X105m3H; the wind speed entering from each tuyere 311 is 20m/s to 50 m/s. The rotating disc 4 rotates at a high speed to generate enough centrifugal force on the molten material, so that the molten material flies out along the tangential direction of the rotation of the rotating disc 4; the cyclone field can be formed in the middle ring section 31 only when the sufficient air volume is achieved and the wind speed entering from each tuyere 311 meets certain requirements.
As a preferable scheme of the present invention, an included angle between the wind direction of the wind blown from the tuyere 311 and the moving direction of the material thrown from the turntable 4 is 70 ° to 90 °. This is a preferred angle, and by the above-mentioned angle design, it is possible to prevent the molten material from hitting the inner side wall of the middle ring section 31 under the action of the cyclone field.
Fig. 4 shows a flow of a method of granulating cooling of a molten material according to an embodiment of the present invention.
As shown in fig. 4, the method for granulating and cooling a molten material according to the present invention for granulating a molten material using the above-mentioned apparatus for granulating and cooling a molten material includes the steps of:
s1, guiding the molten material into the granulating chamber through the material guide pipe, and enabling the molten material to fall into the center of the turntable;
s2, under the action of centrifugal force, the molten material falling into the center of the rotating disc flies out of the rotating disc along the edge of the rotating disc in the direction similar to the rotating tangential line of the rotating disc;
s3, the molten material flying out of the turntable impacts the water-cooled wall of the top cone structure to form fine molten drops;
s4, cooling the fine molten drops by a cyclone field formed by wind entering from the blast nozzle, and solidifying the fine molten drops into primary particles;
s5, performing recooling on the primary particles by a material blocking wind field formed by wind entering the wind inlet structure, and performing secondary cooling on the primary particles to form cooled particles;
and S6, discharging the cooled particles from the discharge hole to obtain granulated and cooled solid particles.
To further illustrate the practical application of the invention, a preferred embodiment of the invention is as follows:
example 1
S1, guiding the blast furnace slag at 1400 ℃ into a granulating chamber through a material guide pipe at the handling capacity of 20t/h, and enabling the blast furnace slag to fall into the center of a turntable; wherein the rotating speed of the rotating disc is 800-1500 rpm; the rotating disc is positioned at the center of the granulating chamber, liquid drops thrown out of the rotating disc firstly reach the wall surface of the water-cooled wall, the distance from the center of the rotating disc to the wall surface of the water-cooled wall in the horizontal direction is set to be 3-8 times of the diameter of the rotating disc, and the embodiment preferably sets the horizontal distance from the center of the rotating disc to the wall surface of the cooling wall to be 3 times of the diameter of the rotating disc; in order to ensure that the liquid drops are not bonded with the wall surface of the water-cooling wall, the angle of collision between the liquid drops and the wall surface of the water-cooling wall is set besides keeping the liquid drops smooth and at a lower temperature, namely the cone vertex angle of the wall surface of the water-cooling wall is controlled, and the cone vertex angle is set to be 120 degrees in the embodiment.
S2, under the action of centrifugal force, the molten material falling into the center of the rotating disc flies out of the rotating disc along the edge of the rotating disc in the direction similar to the rotating tangential line of the rotating disc;
s3, the molten material flying out of the turntable impacts the water-cooled wall of the top cone structure to form fine molten drops;
s4, cooling the fine molten drops by a cyclone field formed by wind entering from the blast nozzle, and solidifying the fine molten drops into primary particles; wherein, the wind speed of the blast orifice is set to be 20-50 m/s, 20 blast orifices are arranged in total, the angle setting A (the included angle between the wind direction and the liquid drop moving direction) is 70-90 degrees, and the preferred setting of the embodiment is 80 degrees;
s5, performing recooling on the primary particles by a material blocking wind field formed by wind entering the wind inlet structure, and performing secondary cooling on the primary particles to form cooled particles; wherein,
the key of the residence time of the particles in the granulating chamber is that the distance from the liquid drops to the lower cone section when the liquid drops collide with the wall surface of the cooling wall is set as m, the distance n is expanded outwards, the cylindrical surface passing through the point and taking the center of the granulating chamber as an axis and the cylindrical surface in the middle of the intersection of the lower cone section and the wall surface of the cooling section are the middle ring section, the value range of m is usually 3 times of the diameter +/-200 mm of a turntable, the value range of n is the radius +/-50 mm of the turntable, the cone vertex angle of the lower cone section is 130 +/-20 degrees, the length of the lower cone section is set by considering that the particles colliding downwards from the wall surface of the water cooling wall are not required to directly fall into a discharge port, so the possible emission angle B of the liquid drops thrown out from the turntable is used as a control parameter, the range of the angle B is 15 +/-5 degrees, the point of the liquid drop particles reaching the surface of the lower cone under the ideal collision condition is used as an outer ring of the, the expansion distance n is 250mm, the cone apex angle of the lower cone section is 140 degrees, the possible emission angle of liquid drops is 15 degrees, the inner diameter of the corresponding middle ring section is 5000mm, the diameter of the outer ring of the discharge opening is 3145mm, and the diameter of the inner ring is 2345 mm. The total air volume of the blocking wind is 10000-15000M 3/h, the blocking wind enters 8 wind boxes through 8 air inlets in average distribution, the number of the lower cone-section fender is 60, and the gap between every two fender is arranged to enable the speed of the blocking wind to reach 20-50M/s. .
And S6, discharging the cooled particles from the discharge hole to obtain the granulated and cooled molten material.
According to the granulating and cooling device and the granulating and cooling method for the molten material, provided by the invention, the molten material is introduced into the granulating chamber through the material guide pipe, the molten material falls into the rotary table, the rotary table runs at a high speed, so that the molten material falling into the center of the rotary table flies out of the rotary table along the edge of the rotary table in a direction similar to the rotation tangent line of the rotary table under the action of centrifugal force and impacts on the water-cooled wall of a top cone structure to form fine molten drops, the fine molten drops reach the upper part of the lower cone section of the granulating chamber under the action of a cyclone field formed by wind entering from a blast hole, at the moment, the surface of the liquid drops is hardened into primary particles due to heat dissipation and temperature reduction, and the interior of the primary particles; the primary particles are acted by a material blocking wind field formed by wind entering from the wind inlet structure of the lower conical section, the circumferential speed of the primary particles is further increased, so that the particles stay in the region for a longer time, and the stay time of the primary particles in the region is controlled by controlling the speed of the material blocking wind field; as the primary particles have enough cooling strength, cooling time and kinetic energy, the particles are prevented from being adhered and the particles are cooled by discharging the particles to the next procedure at proper temperature. The invention can solve the problems of product accumulation, remelting and the like caused by larger particle size particles or large blocks due to insufficient cooling strength of the particles or wall adhesion in the melt granulation cooling process in the prior art.
The granulation cooling apparatus and the granulation cooling method of the molten material proposed according to the present invention are described above by way of example with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that various modifications may be made to the apparatus and method for granulating and cooling molten material of the present invention without departing from the scope of the invention. Therefore, the scope of the present invention should be determined by the contents of the appended claims.
Claims (10)
1. A granulation cooling device for molten material, comprising a granulation chamber; wherein,
the granulation chamber comprises an end cone structure and a lower cone structure connected with the bottom of the end cone structure;
an air outlet is formed in the top end of the tip cone structure, and a material guide pipe is arranged inside the air outlet; a turntable is arranged in the tip cone structure; the center of the rotating disc is opposite to the bottom of the material guide pipe; a water-cooled wall is arranged on the inner side wall of the tip cone structure;
the lower cone structure is arranged on the periphery below the turntable; the lower cone structure comprises a middle ring section connected with the bottom end of the outer side wall of the top cone structure and a lower cone section connected with the middle ring section; wherein,
the outer side wall of the middle ring section is vertically arranged, and at least one group of blast ports is arranged on the outer side wall of the middle ring section, wherein each group of blast ports at least comprises two blast ports which are symmetrically arranged;
the outer side wall of the lower conical section is arranged in an inward inclined manner, and a discharge hole is formed in the bottom of the lower conical section; an air inlet structure is arranged on the outer side wall of the lower conical section; the air inlet structure is arranged between the blast port and the discharge port.
2. A granulating cooling apparatus of a molten material as set forth in claim 1,
the wall surface of the water-cooled wall is a conical surface.
3. A granulating cooling apparatus of a molten material as set forth in claim 1,
the air outlet is arranged in the center of the top end of the tip cone structure;
the material guide pipe is arranged in the middle of the air outlet.
4. A granulating cooling apparatus of a molten material as set forth in claim 1,
the air inlet structure comprises an air box arranged on the outer side of the lower conical section; wherein,
an air inlet channel is arranged between the air box and the lower conical section, and a circle of at least 20 mutually overlapped fender plates are arranged on the side wall of the air box close to one side of the lower conical section; and an air inlet gap is arranged between the adjacent fender boards; and an air inlet is formed in the side wall of one side of the air box, which is far away from the lower conical section.
5. A granulating cooling apparatus of a molten material as set forth in claim 1,
a cooling device is arranged at the bottom end of the rotary table; and/or the presence of a gas in the gas,
the bottom of the turntable is connected with a power device.
6. A granulating cooling apparatus of a molten material as set forth in claim 1,
the rotating direction of the rotary plate, the air inlet direction of the air outlet and the air inlet direction of the air inlet structure are the same.
7. A granulating cooling apparatus of a molten material as set forth in claim 1,
the horizontal distance from the center of the rotary table to the wall surface of the water-cooled wall is 3-8 times of the diameter of the rotary table.
8. A granulating cooling apparatus of a molten material as set forth in claim 1,
the rotating speed of the rotating disc is 800 rpm-1500 rpm; and/or the presence of a gas in the gas,
the total blast quantity entering from the blast port is 1X104m3/h～1X105m3/h；
The wind speed entering from each blast port is 20 m/s-50 m/s.
9. A granulating cooling apparatus of a molten material as set forth in claim 1,
the included angle between the wind direction of the wind blown from the blast nozzle and the motion direction of the material thrown out of the turntable is 70-90 degrees.
10. A method for granulating and cooling a molten material, wherein the molten material is granulated by using the apparatus for granulating and cooling a molten material according to any one of claims 1 to 9, comprising the steps of:
s1, introducing the molten material into the granulating chamber through the material guide pipe, and enabling the molten material to fall into the center of the rotary table;
s2, under the action of centrifugal force, the molten material falling into the center of the rotating disc flies out of the rotating disc along the edge of the rotating disc in the direction similar to the rotating tangential direction of the rotating disc;
s3, enabling the molten material flying out of the rotating disc to impact on the water-cooled wall of the tip cone structure to form fine molten drops;
s4, cooling the fine molten drops by a cyclone field formed by wind entering from the blast nozzle, and solidifying the fine molten drops into primary particles;
s5, re-cooling the primary particles by a material blocking wind field formed by wind entering the wind inlet structure, and secondarily cooling the primary particles to form cooled particles;
and S6, discharging the cooled particles from the discharge hole to obtain granulated and cooled solid particles.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113913566A (en) * | 2021-11-10 | 2022-01-11 | 北京中冶设备研究设计总院有限公司 | Upper cone of granulating device |
| CN113913568A (en) * | 2021-11-10 | 2022-01-11 | 北京中冶设备研究设计总院有限公司 | Granulation chamber of granulation device |
| CN114045366A (en) * | 2021-11-10 | 2022-02-15 | 北京中冶设备研究设计总院有限公司 | Lower exhaust dry granulation device |
| CN114058745A (en) * | 2021-11-10 | 2022-02-18 | 北京中冶设备研究设计总院有限公司 | Lower exhaust air sectional cooling granulation equipment and method |
| CN114085934A (en) * | 2021-11-10 | 2022-02-25 | 北京中冶设备研究设计总院有限公司 | Upper air exhaust dry granulation device |
| CN118142429A (en) * | 2024-05-11 | 2024-06-07 | 杭州嘉悦智能设备有限公司 | Molten salt granulation structure and electrolytic refining molten salt device |
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2020
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113913566A (en) * | 2021-11-10 | 2022-01-11 | 北京中冶设备研究设计总院有限公司 | Upper cone of granulating device |
| CN113913568A (en) * | 2021-11-10 | 2022-01-11 | 北京中冶设备研究设计总院有限公司 | Granulation chamber of granulation device |
| CN114045366A (en) * | 2021-11-10 | 2022-02-15 | 北京中冶设备研究设计总院有限公司 | Lower exhaust dry granulation device |
| CN114058745A (en) * | 2021-11-10 | 2022-02-18 | 北京中冶设备研究设计总院有限公司 | Lower exhaust air sectional cooling granulation equipment and method |
| CN114085934A (en) * | 2021-11-10 | 2022-02-25 | 北京中冶设备研究设计总院有限公司 | Upper air exhaust dry granulation device |
| CN114085934B (en) * | 2021-11-10 | 2022-10-28 | 北京中冶设备研究设计总院有限公司 | Upper air exhaust dry granulation device |
| CN118142429A (en) * | 2024-05-11 | 2024-06-07 | 杭州嘉悦智能设备有限公司 | Molten salt granulation structure and electrolytic refining molten salt device |
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