CN113953029B - Dry stirring mill and operation method thereof - Google Patents

Dry stirring mill and operation method thereof Download PDF

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Publication number
CN113953029B
CN113953029B CN202111209994.4A CN202111209994A CN113953029B CN 113953029 B CN113953029 B CN 113953029B CN 202111209994 A CN202111209994 A CN 202111209994A CN 113953029 B CN113953029 B CN 113953029B
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grinding
air
mill
grinding cylinder
area
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CN113953029A (en
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聂文海
刘畅
杜鑫
柴星腾
石国平
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Tianjin Cement Industry Design and Research Institute Co Ltd
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Tianjin Cement Industry Design and Research Institute Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
    • B02C17/163—Stirring means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/10—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with one or a few disintegrating members arranged in the container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/1815—Cooling or heating devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/183—Feeding or discharging devices
    • B02C17/186—Adding fluid, other than for crushing by fluid energy
    • B02C17/1875—Adding fluid, other than for crushing by fluid energy passing gas through crushing zone
    • B02C17/1885—Adding fluid, other than for crushing by fluid energy passing gas through crushing zone the applied gas acting to effect material separation

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)

Abstract

The invention discloses a dry stirring mill and an operation method thereof, wherein the dry stirring mill comprises a grinding cylinder, a feeding port, a discharging port, a mill air inlet, a mill air outlet, a main shaft, a driving device, a stirrer, a separating device and a grading air supply device; the grinding cylinder is horizontally arranged, one end of the grinding cylinder is provided with a feeding port and a mill air inlet, and the other end of the grinding cylinder is provided with a discharge port and a mill air outlet; the grinding cylinder is internally divided into a grinding area and a grinding classification area, and the grinding area is close to one side of the feeding port; the main shaft is positioned in the grinding cylinder and penetrates through the center of the grinding cylinder, one end of the main shaft is connected with the driving device, the other end of the main shaft is supported by a bearing arranged on the foundation and the bracket, the main shaft positioned in the grinding area is provided with a stirrer, and the main shaft positioned in the grinding classification area is provided with a stirrer and a separating device; the bottom of the grinding cylinder positioned in the grinding classification area is provided with an open hole area, and the grinding cylinder at the open hole area is connected with a classification air supply device. The invention greatly improves the grinding efficiency, ensures the timely separation of materials and grinding media, and improves the reliability and stability of equipment.

Description

Dry stirring mill and operation method thereof
Technical Field
The invention relates to the technical field of stirring mills, in particular to a dry stirring mill and an operation method thereof.
Background
The stirring mill consists of a driving device, a cylinder, a stirrer and a grinding medium, wherein the cylinder is usually a cylinder, the stirrer is usually a spiral type, a rod pin type or a disc type, and the grinding medium is usually a spherical medium such as steel balls, corundum balls, zirconium balls or natural river sand, pebbles and the like. When the grinding device works, the stirring mill cylinder is static, the driving device drives the stirrer to rotate, the stirrer directly applies power to the grinding medium, the grinding medium and the material perform multidimensional circulating motion and autorotation motion, and effective grinding of the material is realized through the grinding, shearing and impacting effects of the medium balls. The grinding efficiency depends on the total number of times that individual particles are effectively impacted by the media within a given time in the agitator mill and the amount of energy that the media transfers to the particles in a single impact event. The stirring mill has high energy density, low fine grinding energy consumption, simple process and uniform product granularity distribution, and is widely applied to the fields of fine grinding and regrinding in recent years. According to the grinding environment, a stirring mill can be divided into a dry method and a wet method; according to the structural form, the stirring mill can be divided into a horizontal type and a vertical type.
At present, the wet stirring mill is large-sized and is widely applied to the mineral processing industry, materials move in a grinding cylinder in a slurry mode, the material has good fluidity, separation of products and grinding media can be conveniently realized, continuous operation is stable, and the process is mature. Although the structure and the grinding principle of the existing dry stirring mill are the same as those of a wet stirring mill, the material motion state of the existing dry stirring mill is completely different from that of the existing wet stirring mill due to the difference of the grinding environment, and the existing dry stirring mill has the following problems in application:
(1) The existing dry stirring mill has the disadvantages of weak collision movement degree of materials and media, poor grinding effect and low grinding efficiency;
(2) In the existing dry stirring mill, when the qualified materials are separated from the grinding media after grinding, the separation effect is poor, and the qualified products cannot be discharged in time, so that the over-grinding of local materials is serious, the stability of equipment is reduced, and the large-scale equipment is limited;
(3) The existing dry stirring mill generates a large amount of heat in the grinding process, has potential safety hazards such as high-temperature scalding, dust explosion and the like, lacks heat dissipation measures and has poor equipment reliability.
Disclosure of Invention
The invention provides a dry stirring mill, which is used for improving the grinding efficiency of the dry stirring mill, ensuring the timely separation of materials and grinding media and improving the reliability and stability of equipment, and aims to solve the problems of low grinding efficiency, poor separation effect of qualified materials and grinding media, difficult heat dissipation, serious over-grinding and the like of the existing dry stirring mill.
In order to achieve the purpose, the invention provides a dry stirring mill which comprises a grinding cylinder, a feeding port, a discharge port, a mill air inlet, a mill air outlet, a main shaft, a driving device, a stirrer, a separating device and a grading air supply device, wherein the grinding cylinder is arranged on the grinding cylinder;
the grinding cylinder is horizontally arranged and supported and fixed through a foundation and a bracket, one end of the grinding cylinder is provided with a feeding port and a mill air inlet, the other end of the grinding cylinder is provided with a discharge port and a mill air outlet, and grinding media are filled in the grinding cylinder; the grinding cylinder is internally divided into a grinding area and a grinding classification area, and the grinding area is close to one side of the feeding port;
the main shaft is positioned in the grinding cylinder and penetrates through the center of the grinding cylinder, one end of the main shaft is connected with the driving device, the other end of the main shaft is supported by a bearing arranged on the foundation and the bracket, a stirrer is arranged on the main shaft positioned in the grinding area, and a stirrer and a separating device are arranged on the main shaft positioned in the grinding grading area;
the bottom of the grinding cylinder positioned in the grinding classification area is provided with an opening area, the opening area is uniformly provided with first air holes, and the grinding cylinder at the opening area is connected with a classification air supply device.
Preferably, the stirrer is detachably fixed on the main shaft, the distance between the outer edge of the stirrer and the inner wall of the grinding cylinder is 2-4 times of the diameter of the grinding medium, the stirrer comprises a disc, a plurality of stirring rods with semicircular sections are uniformly distributed on two side surfaces of the disc respectively, the disc surface of the disc is divided into a plurality of parts by the stirring rods, each part of the disc surface is provided with approximately trapezoidal through holes, and the area of each through hole accounts for 0.4-0.8 time of the area of the corresponding part of the disc surface; the outer edge surface of the disc is uniformly provided with a plurality of activation scrapers, each activation scraper consists of surfaces in three directions, wherein a surface I and a surface II are perpendicular to the main shaft, the surface I and the surface II are arranged in an L-like shape, and a surface III is perpendicular to the surface I and the surface II at the same time, so that the activation scrapers form a semi-closed space which is opened towards the rotating direction side of the stirrer and the feeding port side, and the activation scrapers are obliquely arranged towards the feeding port side, the inclination angle alpha is 5-30 degrees, so that the activation scrapers lift materials and grinding media towards the rotating direction side of the stirrer and the feeding port side.
Preferably, the separating device is in a hollow conical form, the cone angle is 60-120 degrees, the small-diameter end of the separating device is detachably fixed on the main shaft, and the large-diameter end and the grinding cylinder form labyrinth seal to prevent grinding media from passing through; the surface of the separating device is provided with an annular discontinuous grate seam, the upper surface and the lower surface of the grate seam are both parallel to the direction of the main shaft, and the width of the grate seam is 0.6-0.9 times of the diameter of the grinding medium.
Preferably, a first sealing plate is arranged at the large-diameter end of the separation device, a second sealing plate is arranged on the side cover of the grinding cylinder, and the second sealing plate and the first sealing plate are in inserted connection to form a sealing area.
Preferably, the arc length of the opening area is 0.2-0.5 times of the perimeter of the cross section of the grinding cylinder, and the diameter of the first air hole is 0.1-0.6 times of the diameter of the grinding medium.
Preferably, the grading air supply device is arranged below the perforated area and comprises an upper-layer homogenizing air plate, a lower-layer homogenizing air plate, a grading air supply shell and a grading air supply port from top to bottom, the side face of the grading air supply device is provided with an ash cleaning port capable of being opened and closed in a sealing mode, the grading air supply port is arranged at the bottom of the grading air supply shell, the upper-layer homogenizing air plate and the lower-layer homogenizing air plate are respectively and uniformly provided with two air holes, the diameter of each air hole is 1.1-1.3 times of the diameter of the corresponding air hole, homogenizing balls are filled between the upper-layer homogenizing air plate and the lower-layer homogenizing air plate, the diameter of each homogenizing ball is 1.2-2 times of the diameter of the corresponding air hole, and the filling rate of the homogenizing balls is 30-60%.
Preferably, a cooling device is arranged on the periphery of the grinding cylinder, the cooling device is composed of a cooling cylinder, a medium inlet and a medium outlet, the cooling cylinder is arranged on the periphery of the wall of the grinding cylinder except the opening area, so that a space for introducing a cooling medium is formed between the cooling cylinder and the wall of the grinding cylinder, the medium inlet is positioned at the bottom of the cooling cylinder, and the medium outlet is positioned at the top of the cooling cylinder.
Preferably, the space between the cooling cylinder and the wall of the grinding cylinder is divided into a plurality of areas by main partition plates, each area is respectively provided with a medium inlet positioned at the bottom and a medium outlet positioned at the top, and each area is divided into an annular medium channel spirally surrounding the cylinder wall by a partition plate.
Preferably, the length of the grinding area is 0.6-0.9 times of the length of the grinding cylinder, and the length of the grinding cylinder is 1-5 times of the diameter of the grinding cylinder; the filling rate of the grinding medium is 60-85%.
Preferably, the air inlet of the mill is composed of an air inlet pipeline and an air chamber, the air chamber is connected with the end cover of the grinding cylinder, and the end cover of the grinding cylinder is uniformly provided with three air holes, and the diameter of the three air holes is 0.1-0.9 time of that of the grinding medium.
Preferably, the main shaft at the feeding port is detachably provided with a feeding helical blade, the main shaft at the discharging port is detachably provided with a discharging helical blade, and the discharging helical blade is arranged inside the separating device.
The operation method of the dry stirring mill comprises the following steps:
the dry stirring mill is adopted to stir and grind the material to be ground fed from the feeding port by utilizing the air inlet flow of the mill air inlet and the stirrer in the grinding cylinder and continuously convey the material to the discharge port end, then the material after grinding is subjected to coarse-fine separation by the separation device by combining with the uniform upward air flow supplied to the grinding classification area by the classification air supply device, the qualified material is discharged from the discharge port by the separation device, and coarse particles are continuously left in the grinding cylinder for stirring and grinding.
Preferably, the power required for the operation of the dry stirring mill is calculated by adopting the following formula:
P 0 ＝0.0276D T 3 Hvη(6.16-0.0575η)/D J
wherein P is 0 The power required for the operation of the dry stirring mill is kW; d T Is the diameter of the grinding cylinder, m; h is the length of the grinding cylinder, m; v is the linear velocity of the edge of the stirrer, m/s; eta is the filling rate of the grinding medium,%; d J Is the stirrer diameter, m.
Preferably, the power for the operation of the dry stirring mill is calculated by adopting the following formula:
P＝1.25P 0
wherein, P is the power for the operation of the dry stirring mill, kW; p 0 The power required for the operation of the dry stirring mill is kW.
Preferably, the ventilation air volume required by the air inlet of the dry stirring mill is calculated by adopting the following formula:
Q＝5652D T 2 (1-η/100)
wherein Q is a dry stirring millThe ventilation air quantity m required by the air inlet 3 /h；D T M is the diameter of the grinding cylinder; eta is the filling rate of the grinding medium,%.
Preferably, the feeding amount of the dry stirring mill is calculated by adopting the following formula:
M＝P 0 /K
wherein M is the feeding amount of the dry stirring mill, and t/h; p 0 Power, kW, is required for the dry stirring mill; k is a feeding amount coefficient, K =73 when the feed is cement, K =94 when the feed is slag, and K =45 when the feed is fly ash.
Preferably, the amount of the cooling medium required by the dry stirring mill is calculated by adopting the following formula:
N＝0.086P 0 -0.57M-0.00016Q
wherein N is the cooling medium quantity required by the dry stirring mill, and t/h; p 0 The power required for the operation of the dry stirring mill is kW; m is the feeding amount of the dry stirring mill, t/h; q is the ventilation air quantity m required by the air inlet of the dry stirring mill 3 /h。
The invention has the following advantages and beneficial effects:
1) The stirrer has the characteristics of large working area, strong stirring effect, small working resistance, strong wear resistance and the like, can work for a long time at a high rotating speed, can promote the disordered movement of grinding media and materials, increases the total times of effective collision of particles and the grinding media and the energy intensity transmitted to the particles by the grinding media in single collision, and thus improves the grinding efficiency.
2) The activation scraper can promote effective collision of materials and grinding media, and meanwhile, due to the design of the semi-closed space, the materials and the grinding media can be lifted to the inner peripheral space of the grinding cylinder, so that the materials are favorably brought to the discharge end by wind, the material facing surface of the activation scraper is not in direct contact with the materials and the grinding media, and the abrasion of the activation scraper is reduced; the inclined design can ensure that the lifted grinding medium has the tendency of moving towards the feeding end, and the grinding medium is prevented from being accumulated towards the discharging end.
3) The separating device provided by the invention adopts a conical form, a larger separating action area is provided, the upper surface and the lower surface are parallel to the grate seam of the main shaft, qualified materials can quickly pass through the separating device under the action of wind power and stirring, and grinding media are left in the grinding cylinder.
4) The invention provides uniform upward air flow to the grinding and classifying area in the grinding cylinder through the classifying air supply device, so that materials and grinding media in the area are loosened and fluidized, fine-grained materials move upwards to the upper layer of the material surface against gravity, the coarse and fine classification of the materials in the cylinder is realized, fine particles are conveyed to the separating device through axial air, and the qualified products are discharged in time.
5) According to the invention, the multi-region cooling device is arranged at the periphery of the grinding cylinder, so that the heat dissipation speed is improved, and the problem that the heat dissipation effect of the region is poor due to overhigh temperature of the cooling medium at the medium outlet is avoided.
6) The dry stirring mill is used for improving the grinding efficiency of the dry stirring mill, ensuring the timely separation of materials and grinding media and improving the reliability and stability of equipment.
Drawings
FIG. 1 is a schematic diagram of the internal structure of a dry stirring mill provided in an embodiment of the present invention;
FIG. 2 is a schematic diagram of the external structure of a dry stirring mill provided in the embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a stirrer provided in the embodiment of the present invention;
FIG. 4 is a side view of a blender provided in accordance with an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of an air inlet of the mill provided by the embodiment of the invention;
FIG. 6 is a schematic structural diagram of a separation device provided in an embodiment of the present invention;
fig. 7 is a schematic structural view of a grate of the separation device provided by the embodiment of the invention.
In the figure: 1. a feeding port; 2. a grinding cylinder; 2-1, a grinding area; 2-2, grinding and grading area; 3. a drive device; 4. a main shaft; 5. a stirrer; 5-1, disc; 5-2, stirring rods; 5-3, activating the scraper; 5-3-1, and 1, namely flour I; 5-3-2 and flour II; 5-3-3, and flour three; 5-4, through the hole; 6. a feeding screw blade; 7. a discharge helical blade; 8. an air inlet of the mill; 8-1, an air inlet pipeline; 8-2, an air chamber; 8-3, wind hole III; 9. a separation device; 9-1, sealing plate I; 9-2, performing grate seaming; 10. an air outlet of the mill; 11. a second sealing plate; 12. a discharge port; 13. opening the hole area; 13-1, a first air hole; 14. an upper homogenizing air plate; 14-1 and a second air hole; 15. a lower homogenization air plate; 16. a graded air supply shell; 17. a graded air supply port; 18. cleaning an ash hole; 19. a foundation and a support; 20. a cooling cylinder; 21. a media inlet; 22. a medium outlet.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; may be a mechanical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
Referring to fig. 1 to 7, the present embodiment provides a dry stirring mill, which includes a grinding cylinder 2, a feeding port 1, a discharging port 12, a mill air inlet 8, a mill air outlet 10, a main shaft 4, a driving device 3, a stirrer 5, a separating device 9, a grading air supply device, and a cooling device.
The grinding cylinder 2 is cylindrical and horizontally arranged and is supported and fixed through a foundation and a support 19, one end of the grinding cylinder 2 is provided with a feeding port 1 and a mill air inlet 8, the other end of the grinding cylinder 2 is provided with a discharge port 12 and a mill air outlet 10, spherical grinding media with the diameter of 2-15 mm are filled in the grinding cylinder 2, and the filling rate of the grinding media is 60% -85%; the grinding cylinder 2 is divided into a grinding area 2-1 and a grinding classification area 2-2 according to functions, and the grinding area 2-1 is close to one side of the feeding port 1; the length of the grinding area 2-1 is 0.6-0.9 times of the length of the grinding cylinder 2, and the length of the grinding cylinder 2 is 1-5 times of the diameter of the grinding cylinder 2. In this example, the inner diameter of the grinding cylinder 2 is 2000mm, the length is 4500mm, the grinding cylinder 2 is filled with 4mm of spherical grinding medium, the filling rate of the grinding medium is 70%, and the length of the grinding zone 2-1 is 3600mm.
The feeding port 1 is arranged at one end of the grinding cylinder 2, and the opening is upward. The discharge port 12 is arranged at the other end of the grinding cylinder 2 opposite to the feeding port 1, and is opened downwards.
The driving device 3 is arranged at one end of the discharge port 12 of the grinding cylinder 2, and adopts a driving mode of permanent magnetic direct drive or a driving mode of a motor and a speed reducer, and the driving mode of permanent magnetic direct drive is preferably adopted in the embodiment.
The air inlet 8 of the mill consists of an air inlet pipeline 8-1 and an air chamber 8-2, the air chamber 8-2 is connected with the end cover of the grinding cylinder 2, three air holes 8-3 are uniformly formed in the end cover of the grinding cylinder 2, the diameter of the three air holes 8-3 is 0.1-0.9 time of the diameter of the grinding medium, the diameter of the three air holes 8-3 is preferably 3.5mm in the embodiment, and the air supply can be uniformly supplied into the grinding cylinder 2 by the air chamber 8-2 and the three air holes 8-3.
The mill air outlet 10 is arranged above the discharge port 12, the opening is upward, and the back is connected with dust collecting equipment.
The main shaft 4 is a high-speed main shaft 4, is positioned in the grinding cylinder 2 and penetrates through the center of the grinding cylinder 2, one end of the main shaft 4 is connected with the driving device 3 and is driven to rotate by the driving device 3, the other end of the main shaft 4 is supported by a bearing which is positioned outside the feeding port 1 and is arranged on the foundation and the bracket 19, the main shaft 4 positioned in the grinding area 2-1 is provided with a stirrer 5, and the main shaft 4 positioned in the grinding classification area 2-2 is provided with the stirrer 5 and the separating device 9.
The stirrer 5 is detachably fixed on the main shaft 4, the stirrer 5 comprises a disk 5-1, the distance between the outer edge of the stirrer 5 and the inner wall of the grinding cylinder 2 is 2-4 times of the diameter of the grinding medium, in the embodiment, the distance between the outer edge of the stirrer 5 and the inner wall of the grinding cylinder 2 is preferably 10mm, namely, the diameter of the stirrer 5 is 1980mm, 8 stirring rods 5-2 with semicircular sections are uniformly distributed on two side surfaces of the disk 5-1 respectively, in order to promote the disordered movement of the grinding medium and maintain low rotation resistance, the stirring rods 5-2 divide the disk 5-1 into 8 parts, each part of the disk 5-1 is provided with approximately trapezoidal through holes 5-4, the area of each through hole 5-4 accounts for 0.4-0.8 times of the area of the corresponding part of the disk 5-1, and in the embodiment, the area of each through hole 5-4 accounts for 0.5 times of the area of the corresponding part. 8 activating scrapers 5-3 are uniformly distributed on the outer edge surface of the disc 5-1, each activating scraper 5-3 is composed of surfaces in three directions, wherein the surface I5-3-1 and the surface II 5-3-2 are perpendicular to the main shaft 4, the surface I5-3-1 and the surface II 5-3-2 are arranged in an L-like shape, the surface III 5-3-3 is perpendicular to the surface I5-3-1 and the surface II 5-3-2, so that the activating scrapers 5-3 form a semi-closed space which is opened towards the rotating direction side of the stirrer 5 and the feeding port 1 side, the activating scrapers 5-3 are obliquely arranged towards the feeding port 1 side, the inclination angle alpha is 5-30 degrees, in the embodiment, alpha is preferably 10 degrees, and the activating scrapers 5-3 lift the material and the grinding medium towards the rotating direction side of the stirrer 5 and the feeding port 1 side. When the stirrer 5 rotates, the activating scraper 5-3 can promote effective collision of particles and grinding media, meanwhile, the semi-closed space is designed to lift materials and the grinding media to the peripheral space in the grinding cylinder 2 to facilitate the materials to be brought to the discharge end by wind, and on the other hand, a part of relatively static materials and grinding media can be stacked in the semi-closed space, so that the material facing surface of the activating scraper 5-3 is not in direct contact with the materials and the grinding media, the abrasion of the activating scraper 5-3 is reduced, the lifted grinding media can have the tendency of moving towards the feed end due to the design of the inclined surface, and the grinding media are prevented from being stacked towards the discharge end. The disc 5-1 type stirrer 5 has the characteristics of large working area, strong stirring effect, small working resistance, strong wear resistance and the like, can work for a long time at a high rotating speed, and has the edge linear velocity of 8-22m/s. The activation scraper 5-3 and the higher rotating speed can promote the disordered movement of the grinding medium and the material, increase the total times of effective collision of the material particles and the grinding medium and the energy intensity of the grinding medium transferred to the material particles in single collision, thereby improving the grinding efficiency.
The separation device 9 is in a hollow conical form, the cone angle is 60-120 degrees, the cone angle is preferably 90 degrees in the example, the small-diameter end of the separation device 9 is detachably fixed on the main shaft 4, and the large-diameter end and the grinding cylinder 2 form a labyrinth seal to prevent grinding media from passing through; the surface of the separating device 9 is provided with an annular intermittent grate seam 9-2, the upper surface and the lower surface of the grate seam 9-2 are parallel to the direction of the main shaft 4, the width of the grate seam 9-2 is 0.6-0.9 times of the diameter of a grinding medium, the width of the grate seam 9-2 in the embodiment is preferably 3mm, qualified materials can pass through the separating device 9 under the action of wind power and stirring, the grinding medium is remained in the grinding cylinder 2, and a larger separating action area is provided in a conical mode. Specifically, a first sealing plate 9-1 is arranged at the large-diameter end of the separation device 9, a second sealing plate 11 is arranged on the side cover of the grinding cylinder 2, and the second sealing plate 11 and the first sealing plate 9-1 are mutually spliced and combined to form a sealing area.
A feeding helical blade 6 is detachably arranged on the main shaft 4 at the feeding port 1, the feeding helical blade 6 is arranged below the feeding port 1 and used for conveying a newly fed material to be ground into the grinding cylinder 2, a discharging helical blade 7 is detachably arranged on the main shaft 4 at the discharging port 12, and the discharging helical blade 7 is arranged inside the separating device 9 and above the discharging port 12 and used for discharging the material passing through the separating device 9.
The bottom of the grinding cylinder 2 positioned in the grinding classification area 2-2 is provided with an open area 13, the arc length of the open area 13 is 0.2-0.5 times of the perimeter of the cross section of the grinding cylinder 2, the open area 13 is uniformly provided with a first air hole 13-1, the diameter of the first air hole 13-1 is 0.1-0.6 times of the diameter of the grinding medium, the arc length of the open area 13 in the example is 1500mm, and the diameter of the first air hole 13-1 is 2mm; the grinding cylinder 2 at the opening area 13 is connected with a grading air supply device which supplies upward air to the grinding and grading area 2-2 through the opening area 13 to ensure that the materials are in a loose and fluidized state. When the grinding device is specifically arranged, the hole opening area 13 can properly extend towards the grinding area 2-1, so that materials and grinding media can be loosened better to be fluidized, and qualified materials can be separated out in time.
The grading air supply device is arranged below the opening area 13 and consists of an upper-layer homogenizing air plate 14, a lower-layer homogenizing air plate 15, a grading air supply shell 16 and a grading air supply port 17 from top to bottom, an ash cleaning port 18 capable of being opened and closed in a sealing mode is arranged on the side face, the ash cleaning port 18 is used for periodically cleaning accumulated ash leaked from the first air hole 13-1, and the ash cleaning port 18 is closed in a sealing mode when the stirring mill runs. The graded air supply port 17 is arranged at the bottom of the graded air supply shell 16, the upper layer homogenizing air plate 14 and the lower layer homogenizing air plate 15 are respectively and uniformly provided with an air hole II 14-1, the diameter of the air hole II 14-1 is 1.1-1.3 times of the diameter of the air hole I13-1, a homogenizing ball is filled between the upper layer homogenizing air plate 14 and the lower layer homogenizing air plate 15, the diameter of the homogenizing ball is 1.2-2 times of the diameter of the air hole II 14-1, and the filling rate of the homogenizing ball is 30% -60%; the diameter of the second air hole 14-1 in the example is preferably 2.5mm, the diameter of the homogenizing ball is 3mm, and the filling rate of the homogenizing ball is 40%. The two layers of homogenizing air plates and homogenizing balls can make the supplied air be fully and uniformly supplied into the grinding and classifying area 2-2 in the grinding cylinder 2 after the whole space is fully and uniformly filled into the grinding and classifying area 2-2 of the grinding cylinder 2 in the classifying air direction, so that the materials and grinding media in the area can be loosened and fluidized, the fine-grained materials can move upwards to the upper layer of the material surface by overcoming the gravity, and the materials are conveyed to the separating device 9 by the axial air. The device utilizes wind-force to make the material and the grinding medium in the grinding vessel 2 back end region loose fluidization for the fine particle upward movement realizes that the material is hierarchical in the grinding vessel 2 thickness, guarantees the timely discharge of qualified product.
A cooling device is arranged on the periphery of the grinding cylinder 2, the cooling device consists of a cooling cylinder 20, a medium inlet 21 and a medium outlet 22, the cooling cylinder 20 is arranged on the periphery of the cylinder wall of the grinding cylinder 2 except the opening area 13, so that a space which can be filled with a cooling medium is formed between the cooling cylinder 20 and the cylinder wall of the grinding cylinder 2; the space between the cooling cylinder 20 and the wall of the grinding cylinder 2 is divided into 3 areas by main partition boards, each area is divided into an annular medium channel spirally surrounding the cylinder wall by partition boards, and each area is respectively provided with a medium inlet 21 positioned at one end of the bottom and a medium outlet 22 positioned at the other end of the top. The cooling medium in each cooling area is supplied by a medium inlet 21, and is discharged by a medium outlet 22 after the whole area is filled along the annular medium channel; the multi-zone design improves the heat dissipation speed and avoids the problem that the temperature of the cooling medium at the medium outlet 22 is too high, so that the heat dissipation effect of the zone is poor.
The driving device 3 drives the main shaft 4 to rotate, and the main shaft 4 drives the helical blade and the stirrer 5 on the main shaft to rotate. The material is fed through a feeding port 1 at one end of a grinding cylinder 2, is conveyed to a grinding area 2-1 in the grinding cylinder 2 under the rotary conveying action of a helical blade at the feeding end of a main shaft 4, and performs multidimensional cyclic motion and autorotation motion with a grinding medium under the high-speed rotary stirring action of a stirrer 5, and particles are crushed under the action. Cold air is introduced into an air inlet 8 of the mill on one side of the feeding end, the materials move to a grinding classification area 2-2 gradually under the action of wind power and stirring, the materials are in a loose fluidized state under the action of upward wind power in the area, meanwhile, fine particles move upward to realize thickness classification, the fine particles moving to the upper side of the material surface are conveyed to a separation device 9 at the discharging end by axial wind, the fine particles and the materials below the material surface are separated from a grinding medium through the separation device 9, the grinding medium cannot pass through the separation device 9 and stay in the grinding cylinder 2, the qualified products entering the separation device 9 are conveyed to a discharging port 12 under the rotating conveying action of a spiral blade at the discharging end of a main shaft 4 and are discharged from the discharging port 12, and the wind fed into the grinding cylinder 2 passes through the separation device 9 and then is discharged from an air outlet above the discharging port 12. The multi-region cooling device arranged on the periphery of the grinding cylinder 2 ensures continuous cooling of the equipment.
The operation method of the dry stirring mill comprises the following steps:
a dry stirring mill is adopted, the material to be ground fed from a feeding port 1 is stirred and ground by utilizing the air inlet flow of an air inlet 8 of the mill and a stirrer 5 in a grinding cylinder 2 and is continuously conveyed to a discharge port 12 end, the ground material is subjected to thickness separation by a separating device 9 by combining with the uniform upward air flow supplied to a grinding and classifying area 2-2 by a classifying air supply device, qualified material is discharged from the discharge port 12 by the separating device 9, and coarse particles are continuously left in the grinding cylinder 2 for stirring and grinding. Wherein the linear edge velocity of the stirrer 5 is 8 to 22m/s, and the preferred embodiment is 18m/s.
The power required by the operation of the dry stirring mill is calculated by adopting the following formula:
P 0 ＝0.0276D T 3 Hvη(6.16-0.0575η)/D J
wherein: p 0 The power required for the operation of the dry stirring mill is kW; d T Is the diameter of the grinding cylinder 2, m; h is the length of the grinding cylinder 2, m; v is the edge linear velocity of the stirrer 5, m/s; eta is the filling rate of the grinding medium,%; d J Is the stirrer 5 diameter, m.
The running matched power of the dry stirring mill is calculated by adopting the following formula:
P＝1.25P 0
wherein, P is the power for the operation of the dry stirring mill, kW; p is 0 The power required for the operation of the dry stirring mill is kW.
The ventilation air quantity required by the air inlet 8 of the dry stirring mill is calculated by adopting the following formula:
Q＝5652D T 2 (1-η/100)
wherein Q is the ventilation air volume required by the air inlet 8 of the dry stirring mill, m 3 /h；D T Is the diameter of the grinding cylinder 2, m; eta is the filling rate of the grinding medium,%.
The feeding amount of the dry stirring mill is calculated by adopting the following formula:
M＝P 0 /K
wherein M is the feeding amount of the dry stirring mill, and t/h; p 0 Power, kW, is required for the dry stirring mill; k is a feeding amount coefficient, K =73 when the feed is cement, K =94 when the feed is slag, and K =45 when the feed is fly ash.
The cooling medium mass required by the dry stirring mill is calculated by adopting the following formula:
N＝0.086P 0 -0.57M-0.00016Q
wherein N is required by a dry stirring millCooling medium quantity, t/h; the cooling medium is water or conventional air; p 0 The power required for the operation of the dry stirring mill is kW; m is the feeding amount of the dry stirring mill, t/h; q is the ventilation air quantity m required by the air inlet 8 of the dry stirring mill 3 /h。
In conclusion, the dry stirring mill provided by the invention can greatly improve the grinding efficiency of the dry stirring mill, ensure the timely separation of materials and grinding media, and improve the reliability and stability of equipment.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or some or all of the technical features may be equivalently replaced, and the modifications or the replacements may not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A dry stirring mill is characterized by comprising a grinding cylinder, a feeding port, a discharging port, a mill air inlet, a mill air outlet, a main shaft, a driving device, a stirrer, a separating device and a grading air supply device;
the grinding cylinder is horizontally arranged and supported and fixed through a foundation and a bracket, one end of the grinding cylinder is provided with a feeding port and a mill air inlet, the other end of the grinding cylinder is provided with a discharging port and a mill air outlet, and grinding media are filled in the grinding cylinder; the grinding cylinder is internally divided into a grinding area and a grinding classification area, and the grinding area is close to one side of the feeding port;
the main shaft is positioned in the grinding cylinder and penetrates through the center of the grinding cylinder, one end of the main shaft is connected with the driving device, the other end of the main shaft is supported by a bearing arranged on the foundation and the bracket, a stirrer is arranged on the main shaft positioned in the grinding area, and a stirrer and a separating device are arranged on the main shaft positioned in the grinding grading area;
the bottom of the grinding cylinder positioned in the grinding classification area is provided with an opening area, the opening area is uniformly provided with first air holes, and the grinding cylinder at the opening area is connected with a classification air supply device; the stirrer is detachably fixed on the main shaft, the distance between the outer edge of the stirrer and the inner wall of the grinding cylinder is 2-4 times of the diameter of a grinding medium, the stirrer comprises a disc, a plurality of stirring rods with semicircular sections are uniformly distributed on two side surfaces of the disc respectively, the disc surface of the disc is divided into a plurality of parts by the stirring rods, each part of the disc surface is provided with a through hole which is approximately trapezoidal, and the area of each through hole accounts for 0.4-0.8 time of the area of the disc surface of the corresponding part; the outer edge surface of the disc is uniformly provided with a plurality of activation scrapers, each activation scraper consists of surfaces in three directions, wherein a surface I and a surface II are perpendicular to the main shaft, the surface I and the surface II are arranged in an L-like shape, and a surface III is perpendicular to the surface I and the surface II at the same time, so that the activation scrapers form a semi-closed space which is opened towards the rotating direction side of the stirrer and the feeding port side, and the activation scrapers are obliquely arranged towards the feeding port side, the inclination angle alpha is 5-30 degrees, so that the activation scrapers lift materials and grinding media towards the rotating direction side of the stirrer and the feeding port side.
2. A dry agitator mill as claimed in claim 1, wherein the separator is in the form of a hollow cone having a cone angle of 60 ° to 120 °, the smaller diameter end of the separator being releasably secured to the spindle, the larger diameter end forming a labyrinth seal with the grinding drum to prevent the passage of grinding media; the surface of the separating device is provided with an annular discontinuous grate seam, the upper surface and the lower surface of the grate seam are both parallel to the direction of the main shaft, and the width of the grate seam is 0.6-0.9 times of the diameter of the grinding medium.
3. The dry stirring mill as set forth in claim 2, wherein a first sealing plate is provided at a large diameter end of the separating means, and a second sealing plate is provided on the grinding cylinder side cover, and the second sealing plate and the first sealing plate are engaged with each other in an insertion manner to form a sealing region.
4. A dry agitator mill as claimed in claim 1, wherein the open area has an arc length of 0.2 to 0.5 times the circumference of the cross-section of the grinding cylinder and the one-pass diameter of the air holes is 0.1 to 0.6 times the diameter of the grinding media.
5. The dry stirring mill according to claim 1, wherein the classifying air supply device is disposed below the opening area, the device is composed of an upper homogenizing air plate, a lower homogenizing air plate, a classifying air supply housing and a classifying air supply port from top to bottom, the side surface of the classifying air supply device is provided with an ash cleaning port which can be opened and closed in a sealing manner, the classifying air supply port is disposed at the bottom of the classifying air supply housing, the upper homogenizing air plate and the lower homogenizing air plate are respectively and uniformly provided with two air holes, the diameter of each air hole is 1.1-1.3 times of the diameter of each air hole, homogenizing balls are filled between the upper homogenizing air plate and the lower homogenizing air plate, the diameter of each homogenizing ball is 1.2-2 times of the diameter of each air hole, and the filling rate of the homogenizing balls is 30-60%.
6. The dry stirring mill as recited in claim 1, wherein the periphery of the grinding drum is provided with a cooling device, the cooling device is composed of a cooling drum, a medium inlet and a medium outlet, the cooling drum is arranged on the periphery of the wall of the grinding drum except the opening region, so that a space into which a cooling medium can be introduced is formed between the cooling drum and the wall of the grinding drum, the medium inlet is positioned at the bottom of the cooling drum, and the medium outlet is positioned at the top of the cooling drum.
7. A dry mixer mill according to claim 6, characterised in that the space between the cooling drum and the wall of the grinding drum is divided into a plurality of zones by means of main partition walls, each zone being provided with a medium inlet at the bottom and a medium outlet at the top, and each zone being divided by means of a partition wall into an annular medium channel which spirals around the wall.
8. A dry agitator mill as claimed in claim 1, wherein the grinding zone length is from 0.6 to 0.9 times the grinding drum length, which is from 1 to 5 times the grinding drum diameter; the filling rate of the grinding medium is 60-85%;
the air inlet of the mill is composed of an air inlet pipeline and an air chamber, the air chamber is connected with an end cover of the grinding cylinder, and three air holes are uniformly formed in the end cover of the grinding cylinder, and the diameter of each air hole is 0.1-0.9 times of that of the grinding medium;
the main shaft at the feeding port is detachably provided with a feeding helical blade, the main shaft at the discharging port is detachably provided with a discharging helical blade, and the discharging helical blade is arranged inside the separating device.
9. A method for operating a dry stirring mill according to any one of claims 1 to 8, characterized in that the dry stirring mill is used to stir and grind the material to be ground fed from the feeding port by using the inlet airflow of the mill air inlet and the stirrer in the grinding cylinder and continuously convey the material to the discharging port, and then the ground material is coarsely and finely separated by the separation device by combining with the uniform upward airflow supplied to the grinding and classifying area by the classifying air supply device, the qualified material is discharged from the discharging port by the separation device, and the coarse particles are continuously left in the grinding cylinder for stirring and grinding.
10. A method for operating a dry agitator mill according to claim 9, wherein the power requirement for operation of the dry agitator mill is calculated using the following formula:
P 0 ＝0.0276D T 3 Hvη(6.16-0.0575η)/D J
wherein, P 0 The power required for the operation of the dry stirring mill is kW; d T Is the diameter of the grinding cylinder, m; h is the length of the grinding cylinder, m; v is the linear velocity of the edge of the stirrer, m/s; eta is the filling rate of the grinding medium,%; d J Is the stirrer diameter, m;
the power for the operation of the dry stirring mill is calculated by adopting the following formula:
P＝1.25P 0
wherein, P is the power for the operation of the dry stirring mill, kW; p 0 The power required for the operation of the dry stirring mill is kW;
the required ventilation air volume of the air inlet of the dry stirring mill is calculated by adopting the following formula:
Q＝5652D T 2 (1-η/100)
wherein Q is the ventilation air volume required by the air inlet of the dry stirring mill, m 3 /h；D T Is the diameter of the grinding cylinder, m; eta is the filling rate of the grinding medium,%;
the feeding amount of the dry stirring mill is calculated by adopting the following formula:
M＝P 0 /K
wherein M is the feeding amount of the dry stirring mill, and t/h; p 0 kW is required for the dry stirring mill; k is a feeding amount coefficient, K =73 when the feed is cement, K =94 when the feed is slag, and K =45 when the feed is fly ash;
the cooling medium mass required by the dry stirring mill is calculated by adopting the following formula:
N＝0.086P 0 -0.57M-0.00016Q
wherein N is the cooling medium quantity required by the dry stirring mill, and t/h; p 0 The power required for the operation of the dry stirring mill is kW; m is the feeding amount of the dry stirring mill, t/h; q is the ventilation air quantity m required by the air inlet of the dry stirring mill 3 /h。
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