CN111495546B - Grinding and crushing device and method for rotary fluidized bed - Google Patents
Grinding and crushing device and method for rotary fluidized bed Download PDFInfo
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- CN111495546B CN111495546B CN202010304603.6A CN202010304603A CN111495546B CN 111495546 B CN111495546 B CN 111495546B CN 202010304603 A CN202010304603 A CN 202010304603A CN 111495546 B CN111495546 B CN 111495546B
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- 238000000227 grinding Methods 0.000 title claims abstract description 199
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 40
- 238000009826 distribution Methods 0.000 claims abstract description 22
- 230000001174 ascending effect Effects 0.000 claims abstract description 21
- 230000008569 process Effects 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims description 22
- 230000009471 action Effects 0.000 claims description 16
- 238000010298 pulverizing process Methods 0.000 claims description 6
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 6
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 239000011362 coarse particle Substances 0.000 claims description 3
- 239000010419 fine particle Substances 0.000 claims description 3
- 239000007769 metal material Substances 0.000 abstract description 8
- 238000002360 preparation method Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 229910052755 nonmetal Inorganic materials 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 2
- 238000009837 dry grinding Methods 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 1
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- 238000005056 compaction Methods 0.000 description 1
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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
- B02C19/00—Other disintegrating devices or methods
- B02C19/0012—Devices for disintegrating materials by collision of these materials against a breaking surface or breaking body and/or by friction between the material particles (also for grain)
- B02C19/005—Devices for disintegrating materials by collision of these materials against a breaking surface or breaking body and/or by friction between the material particles (also for grain) the materials to be pulverised being disintegrated by collision of, or friction between, the material particles
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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
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
- B02C23/24—Passing gas through crushing or disintegrating zone
- B02C23/30—Passing gas through crushing or disintegrating zone the applied gas acting to effect material separation
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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
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
- B02C23/24—Passing gas through crushing or disintegrating zone
- B02C23/32—Passing gas through crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone
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Abstract
The invention discloses a grinding and crushing device and a grinding and crushing method for a rotary fluidized bed, which comprise a grinding and crushing device and a grading device, wherein the grinding and crushing device comprises a grinding cylinder body, a gas distribution plate, an air inlet pipe, a first fan, a first electromagnetic butterfly valve, a grinding wall, grinding balls, a tangential air inlet pipe, an annular air pipe, an air inlet pipe, a second fan and a second electromagnetic butterfly valve; the grading device comprises a primary grading cyclone, a secondary grading cyclone, a third electromagnetic butterfly valve and a fourth electromagnetic butterfly valve; the combination of the rotating airflow generated by the tangential air inlet pipe and the ascending airflow generated by the gas distribution plate promotes the materials to be in a dispersed state in the grinding chamber, so that the materials are crushed by the friction collision between the grinding balls and the grinding wall; and then after the grinding and crushing process is finished, adjusting the speed of the ascending air flow to enable the crushed materials to sequentially enter a first-stage classification cyclone and a second-stage classification cyclone for classification. The device is simple, is convenient to operate, and can be used for superfine preparation of non-metallic materials.
Description
Technical Field
The invention relates to the technical field of dry grinding of non-metallic materials, in particular to a rotary fluidized bed grinding and grinding device and a rotary fluidized bed grinding and grinding method.
Background
The non-metal material relates to the aspects of life and industrial production, is widely applied to the industries of non-metal ore, chemical industry, metallurgy, food, medicine, feed, coating, plastic, rubber and the like, and is an important link for processing and utilizing the non-metal material for ultrafine grinding. The dry grinding technology, especially the air flow grinding technology, occupies an important position in the ultrafine grinding operation of materials. However, in order to ensure supersonic speed of the ejected material, the current jet mill technology has high requirements on the design and material of a nozzle and the performance of an induced air (or blast) device, so that a plurality of auxiliary devices are provided, the main structure is complicated, the production process is complicated, and the large-scale and energy-saving of the device are difficult to realize while the material crushing effect is ensured.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides the rotary fluidized bed grinding and crushing device and the rotary fluidized bed grinding and crushing method which are simple in device and convenient to operate and can be used for non-metallic materials.
In order to achieve the purpose, the invention is implemented according to the following technical scheme:
a rotary fluidized bed grinding and crushing device comprises a grinding and crushing device and a grading device, wherein the grinding and crushing device comprises a grinding cylinder body, the top of the grinding cylinder body is provided with a discharge hole, a gas distribution plate which divides the inner space of the grinding cylinder body into a grinding chamber and an air chamber from top to bottom is fixed in the grinding cylinder body, a raw material feed port is arranged on one side wall of the grinding chamber, an air inlet pipe is arranged on one side wall of the air chamber and connected to an air outlet of a first fan, a first electromagnetic butterfly valve is arranged in the air inlet pipe, a grinding wall is circumferentially fixed on the inner side wall of the grinding chamber above the gas distribution plate, grinding balls are arranged in the grinding chamber, a plurality of tangential air inlet pipes which are spirally distributed are uniformly distributed on the grinding chamber and the grinding wall which penetrate through the upper part of the gas distribution plate, the end parts of the tangential air inlet pipes are communicated with an annular air pipe arranged outside the grinding cylinder body, and air inlet pipes are respectively connected with two sides of the annular air pipe, the end part of the air inlet pipe is connected to an air outlet of the second fan, and a second electromagnetic butterfly valve is arranged in the air inlet pipe;
the grading device comprises a primary grading cyclone and a secondary grading cyclone, a feed inlet of the primary grading cyclone is communicated with a discharge outlet at the top of the grinding chamber, a bottom flow port of the primary grading cyclone is connected to the side wall of the grinding chamber through a pipeline and communicated with the inside of the grinding chamber, and a third electromagnetic butterfly valve is arranged in the bottom flow port of the primary grading cyclone; the overflow port of the first-stage classification cyclone is connected with the feed inlet of the second-stage classification cyclone through a pipeline, and a fourth electromagnetic butterfly valve is arranged in the underflow port of the second-stage classification cyclone.
Furthermore, the grinding wall is a silicon carbide coating which is annularly distributed on the inner side wall of the grinding chamber, the grinding wall is convex, and the height of the grinding wall is 100 mm.
Further, first electromagnetism butterfly valve in the air intake pipe is used for adjusting to the indoor wind speed that admits air of air, and first electromagnetism butterfly valve adjusts the wind speed that admits air and includes two stages: the air inlet speed is adjusted to be 5-10m/s in the first stage, and the air inlet speed is adjusted to be 15-20m/s in the second stage; and the second electromagnetic butterfly valve in the air inlet pipe is used for adjusting the air inlet speed into the grinding chamber, and the air inlet speed is adjusted to be 10-15 m/s.
Furthermore, round holes with the aperture ratio of 10% -20% are uniformly distributed on the gas distribution plate.
Further, the lower part of the grinding cylinder body is cylindrical, the diameter is 1000mm, and the height is 2000 mm; the upper part is conical, and the cone angle is 120 degrees.
Further, the grinding balls are hollow silicon carbide spheres, the number of the grinding balls is 1, and the diameter of each grinding ball is 50 mm.
Preferably, the tangential air inlet pipes are provided in six.
Preferably, a first check valve is arranged in the raw material feeding hole, and a second check valve is arranged at the joint of the bottom flow port of the primary classification cyclone and the side wall of the grinding chamber through a pipeline.
In addition, the invention also provides a rotary fluidized bed grinding and crushing method, which uses the rotary fluidized bed grinding and crushing device for grinding and crushing and comprises the following specific steps:
step one, starting a first fan, adjusting the air flow speed of an air inlet pipe to be within the range of 5-10m/s by adjusting a first electromagnetic butterfly valve, and forming ascending air flow in a grinding chamber through a gas air distribution plate; starting a second fan, adjusting the air flow speed of the air inlet pipe to be within the range of 10-15m/s by adjusting two second electromagnetic butterfly valves, and forming rotary air flow in the grinding chamber through the tangential air inlet pipe to drive the grinding balls to do centrifugal rotary motion along the grinding wall;
feeding the raw materials into the grinding chamber through a raw material inlet and feeding the raw materials onto a gas distribution plate; the raw materials are in a dispersed state under the action of the ascending airflow and perform centrifugal rotation movement under the action of the rotating airflow, and the materials are collided with each other, rubbed and crushed, and are ground to a proper size fraction by mutual grinding between the grinding balls and the grinding wall;
adjusting the air flow speed of the air inlet pipe to be within the range of 15-20m/s by adjusting a first electromagnetic butterfly valve, enabling the ground and crushed materials to be in a elutriation state under the action of ascending air flow, ascending to the top of a grinding chamber, entering a primary grading cyclone through a discharge port, enabling fine particles to enter a secondary grading cyclone through an overflow port of the primary grading cyclone, and enabling qualified particle-grade materials to be discharged as finished products through a bottom flow port of the secondary grading cyclone; coarse particles enter the grinding chamber again through the underflow port of the primary grading cyclone to participate in the next grinding and crushing process;
and step four, when no finished product appears at the underflow port of the secondary classification cyclone, the step one to the step three are circulated until no finished product appears at the underflow port of the secondary classification cyclone, and the whole grinding and crushing process is completed.
Compared with the prior art, the invention has the following beneficial effects:
1) the device has reasonable design, simple structure and convenient operation, and provides a new way for grinding and crushing the non-metallic materials.
2) The device adopts the mode of combining the ascending air flow and the rotating air flow for the first time, effectively improves the dispersion degree of the materials, avoids the compaction and agglomeration phenomena of the materials in the grinding process, increases the contact rate between the materials and the grinding balls and the grinding wall, and is favorable for effectively grinding and crushing the materials.
3) The grinding balls in the device are not driven by a traditional power rotating device, and the power of the grinding balls is derived from the rotating airflow fed by a tangential air inlet pipe. Because the grinding ball adopts a hollow design, the centrifugal rotary motion along the grinding wall can be realized under the pushing of the rotary air flow, and the materials between the grinding ball and the grinding wall are ground.
4) This device has changed the single material self collision crushing mode of traditional jet mill, adopts rotatory air current to make the material high-speed rotatory, taking place self friction, the collision is kibbling in, because self centrifugal force effect and grinding take place the friction between the wall and smash, and under the friction between the effect of rolling and rotatory grinding ball and the grinding wall by rotatory air current driven rotatory grinding ball, its comminuted process can further strengthen, the grinding and crushing rate of material has effectively been improved in the combination of three kinds of crushing modes.
5) The device abandons the classification mode of the traditional classification wheel, adopts a two-stage classification cyclone device, can realize the superfine preparation of non-metallic materials, and is widely applied to other fields such as energy, chemical industry, materials and the like.
6) The grinding, crushing and transporting processes of the materials are carried out in a staged mode, the state of the materials is promoted to change by adjusting the speed of the ascending air flow, the dispersing state during grinding and crushing is changed into the yankee state during transporting, the related flow is simplified, and the smooth operation of each process is facilitated.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a structural sectional view of the main body device of fig. 1.
Reference numbers in the figures: 1. a secondary classification cyclone; 2. an overflow port of the secondary classification cyclone; 3. a underflow port of the secondary classification cyclone; 3a, a fourth electromagnetic butterfly valve; 4. a first stage classification swirler; 5. a underflow port of the primary classification swirler; 5a, a third electromagnetic butterfly valve; 6. grinding the cylinder body; 61. a grinding chamber; 7. a discharge outlet; 8a, a first check valve; 8b, a second check valve; 9. a raw material inlet; 10. an air inlet pipe; 10a, a second electromagnetic butterfly valve; 11. grinding the wall; 12. grinding balls; 13. a gas distribution plate; 14. an air chamber; 15. an air inlet pipe; 15a, a first electromagnetic butterfly valve; 16. a second fan; 17. a first fan; 18. an annular air duct; 19. a tangential air inlet pipe.
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 with reference to the following embodiments. The specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
As shown in fig. 1 and fig. 2, the rotating fluidized bed grinding and pulverizing apparatus of the present embodiment includes a grinding and pulverizing apparatus and a classifying apparatus, the grinding and pulverizing apparatus includes a grinding cylinder 6, in the present embodiment, the lower portion of the grinding cylinder 6 is cylindrical, the diameter is 1000mm, and the height is 2000 mm; the upper part is conical, and the cone angle is 120 degrees; grinding cylinder 6 top is equipped with bin outlet 7, grinding cylinder 6 internal fixation has the gas distribution board 13 who cuts apart grinding cylinder 6 inner space from top to bottom into grinding chamber 61 and air chamber 14, and even cloth has the aperture ratio to be 10% -20% round hole on the gas distribution board 13, and a lateral wall of grinding chamber 61 is equipped with raw materials feed inlet 9, and 14 lateral walls of air chamber are equipped with air-supply line 15, and air-supply line 15 is connected to the air outlet of first fan 17, be equipped with first electromagnetic butterfly valve 15a in the air-supply line 15, first electromagnetic butterfly valve 15a in the air-supply line 15 is used for adjusting the wind speed of admitting air to the air chamber 14, and first electromagnetic butterfly valve 15a adjusts the wind speed of admitting air and includes two stages: the first stage is to adjust the air inlet speed to 5-10m/s, and the stage mainly has the function of leading the raw materials to be in a dispersed state under the action of ascending airflow; the second stage adjusts the air inlet speed to be 15-20m/s, and the stage mainly has the function of enabling the ground and crushed materials to be in a elutriation state under the action of the ascending air flow; a grinding wall 11 is circumferentially fixed on the inner side wall of the grinding chamber 61 above the gas distribution plate 13, the grinding wall 11 is a silicon carbide coating annularly distributed on the inner side wall of the grinding chamber 61, the grinding wall 11 is in an outward convex shape, and the height of the grinding wall 11 is 100 mm; a grinding ball 12 is arranged in the grinding chamber 61, the grinding ball 12 is a hollow silicon carbide sphere, and the diameter of the grinding ball 12 is 50 mm; six tangential air inlet pipes 19 which are spirally distributed are uniformly distributed through the grinding chamber 61 above the gas distribution plate 13 and the grinding wall 11, the six tangential air inlet pipes 19 are positioned on the same circumference, and the end parts of the tangential air inlet pipes 19 are connected with an annular air pipe 18 arranged outside the grinding cylinder body 6 and are commonly used for forming rotary air flow into the grinding chamber 61; the two sides of the annular air pipe 18 are respectively connected with an air inlet pipe 10, the end part of the air inlet pipe 10 is connected to an air outlet of a second fan 16, a second electromagnetic butterfly valve 10a is arranged in the air inlet pipe 10, the second electromagnetic butterfly valve 10a in the air inlet pipe 10 is used for adjusting the air inlet speed into the grinding chamber 61, the air inlet speed is adjusted to be 10-15m/s, the rotating air flow is used for enabling materials entering the grinding chamber 61 and the grinding balls 12 to do centrifugal rotation motion along the grinding wall 11, and meanwhile, the materials are ground and crushed through mutual grinding between the grinding balls 12 and the grinding wall 11;
the grading device comprises a primary grading cyclone 4 and a secondary grading cyclone 1, a feed inlet of the primary grading cyclone 4 is communicated with a discharge outlet 7 at the top of a grinding chamber 61, a bottom flow port 5 of the primary grading cyclone 4 is connected to the side wall of the grinding chamber 61 through a pipeline and communicated with the inside of the grinding chamber 61, and a third electromagnetic butterfly valve 5a is arranged in the bottom flow port 5 of the primary grading cyclone 4; an overflow port of the first-stage classification cyclone 4 is connected with a feed inlet of the second-stage classification cyclone 1 through a pipeline, and a fourth electromagnetic butterfly valve 3a is arranged in a bottom flow port 3 of the second-stage classification cyclone 1.
It should be noted that all the electromagnetic butterfly valves in this embodiment can be directly purchased from the market for installation and use, and the specific installation structure thereof is common knowledge in the art, and therefore, the details of this embodiment are not described again.
In addition, the first electromagnetic butterfly valve 15a, the second electromagnetic butterfly valve 10a, the third electromagnetic butterfly valve 5a, and the fourth electromagnetic butterfly valve 3a in this embodiment may be controlled by separate controllers, and the control and adjustment method thereof is conventional operation in the art and is not described again in this embodiment.
In the grinding and crushing device of the rotary fluidized bed of the embodiment, materials are dispersed in the grinding chamber 61 and crushed under the self friction and collision action through the combination of the rotating airflow generated by the tangential air inlet pipe 19 at the lower part of the grinding chamber 61 and the ascending airflow generated by the bottom gas distribution plate 13; part of the materials rotate at high speed under the action of the rotating airflow, so that friction crushing is generated between the materials and the grinding wall 11 under the action of self centrifugal force; at the same time, the crushing process of the material is further enhanced by the crushing action of the rotating grinding balls 12 driven by the rotating air flow and the friction action between the grinding balls 12 and the grinding wall 11. Then after the grinding and crushing process is finished, the speed of the ascending air flow is adjusted through the first electromagnetic butterfly valve 15a, so that the crushed materials are changed from a dispersed state to a yankee state, and enter the primary classification cyclone 4 and the secondary classification cyclone 1 for classification through the discharge hole 7 at the top of the grinding chamber 61 in sequence.
In the actual use process, in order to prevent the particles of the raw material ground and pulverized in the grinding chamber 61 from overflowing from the raw material feed port 9 and the underflow port 5 of the primary classifying cyclone 4, a first check valve 8a is arranged in the raw material feed port 9, and a second check valve 8b is arranged at the joint of the underflow port 5 of the primary classifying cyclone 4 and the side wall of the grinding chamber 61 through a pipeline. The first check valve 8a and the second check valve 8b can be directly purchased from the market for installation and use, and the specific installation structure is common knowledge in the field, so that the details are not described again in this embodiment.
The rotary fluidized bed grinding and crushing device of the embodiment can be used for grinding and crushing non-metallic materials (feed is taken as an example in the embodiment), and comprises the following specific steps:
step one, starting a first fan 17, adjusting the air flow speed of an air inlet pipe 15 to be within the range of 5-10m/s by adjusting a first electromagnetic butterfly valve 15a, and forming an ascending air flow in a grinding chamber 6 through a gas air distribution plate 13; turning on a second fan 16, adjusting the air flow speed of the air inlet pipe 10 to be within the range of 10-15m/s by adjusting two second electromagnetic butterfly valves 10a, and forming rotating air flow in the grinding chamber 61 through a tangential air inlet pipe 19 to drive the grinding balls 12 to do centrifugal rotating motion along the grinding wall 11;
feeding the raw materials into the grinding chamber 61 through the raw material feeding hole 9, and feeding the raw materials onto the gas distribution plate 13; the raw materials are in a dispersed state under the action of the ascending air flow and do centrifugal rotation motion under the action of the rotating air flow, the materials are collided with each other and ground by friction, and the materials are ground into proper size fraction by mutual grinding between the grinding balls 12 and the grinding wall 11;
adjusting the air flow speed of the air inlet pipe 15 to be within the range of 15-20m/s by adjusting the first electromagnetic butterfly valve 15a, enabling the ground and crushed materials to be in a elutriation state under the action of ascending air flow, ascending to the top of the grinding chamber 61, entering the primary classification cyclone 4 through the discharge port 7, enabling fine particles to enter the secondary classification cyclone 1 through the overflow port of the primary classification cyclone 4, and enabling qualified particle-grade materials to pass through the bottom flow port 3 of the secondary classification cyclone to be finished products and be discharged; wherein, the coarse particles enter the grinding chamber 61 again through the underflow port 5 of the primary classifying cyclone to participate in the next grinding and crushing process;
and step four, when the underflow port 3 of the secondary classification cyclone has no finished product, the step one to the step three are circulated until the underflow port 3 of the secondary classification cyclone 1 has no finished product, and the whole grinding and crushing process is completed.
In summary, the invention adopts the mode of combining the ascending air flow with the rotating air flow to realize the dispersion and collision of the materials at lower wind speed, reduces the nozzle equipment and related links, increases the grinding effect of the grinding balls and the grinding wall, promotes the material to be more uniformly and thoroughly crushed, and ensures the crushing effect of the materials while realizing energy conservation; then the superfine particles can be prepared by grading through a first-stage grading swirler and a second-stage grading swirler. In addition, the device has simple and compact structure, is more suitable for large-scale design and arrangement, and can well meet the requirements of modern life and industrial production.
The technical solution of the present invention is not limited to the limitations of the above specific embodiments, and all technical modifications made according to the technical solution of the present invention fall within the protection scope of the present invention.
Claims (9)
1. The utility model provides a rotatory fluidized bed grinds reducing mechanism, includes grinds reducing mechanism and grading plant, its characterized in that: the grinding and smashing device comprises a grinding cylinder body (6), a discharge hole (7) is formed in the top of the grinding cylinder body (6), a gas distribution plate (13) which divides the inner space of the grinding cylinder body (6) into a grinding chamber (61) and an air chamber (14) from top to bottom is fixed in the grinding cylinder body (6), a raw material feed inlet (9) is formed in one side wall of the grinding chamber (61), an air inlet pipe (15) is formed in one side wall of the air chamber (14), the air inlet pipe (15) is connected to an air outlet of a first fan (17), a first electromagnetic butterfly valve (15 a) is arranged in the air inlet pipe (15), a grinding wall (11) is circumferentially fixed on the inner side wall of the grinding chamber (61) above the gas distribution plate (13), grinding balls (12) are arranged in the grinding chamber (61), and a plurality of tangential air inlet pipes (19) which are spirally distributed are uniformly distributed on the grinding chamber (61) and the grinding wall (11) which penetrate through the upper portion of the gas distribution plate (13), the end part of the tangential air inlet pipe (19) is communicated with an annular air pipe (18) arranged outside the grinding cylinder body (6), two sides of the annular air pipe (18) are respectively connected with an air inlet pipe (10), the end part of the air inlet pipe (10) is connected to an air outlet of a second fan (16), and a second electromagnetic butterfly valve (10 a) is arranged in the air inlet pipe (10);
the grading device comprises a primary grading cyclone (4) and a secondary grading cyclone (1), a feed inlet of the primary grading cyclone (4) is communicated with a discharge outlet (7) at the top of a grinding chamber (61), a bottom flow port (5) of the primary grading cyclone (4) is connected to the side wall of the grinding chamber (61) through a pipeline and communicated with the inside of the grinding chamber (61), and a third electromagnetic butterfly valve (5 a) is arranged in the bottom flow port (5) of the primary grading cyclone (4); an overflow port of the first-stage classification cyclone (4) is connected with a feed inlet of the second-stage classification cyclone (1) through a pipeline, and a fourth electromagnetic butterfly valve (3 a) is arranged in a bottom flow port (3) of the second-stage classification cyclone (1).
2. The rotary fluidized bed grinding mill of claim 1 wherein: the grinding wall (11) is a silicon carbide coating which is annularly distributed on the inner side wall of the grinding chamber (61), the grinding wall (11) is convex, and the height of the grinding wall (11) is 100 mm.
3. The rotary fluidized bed grinding mill of claim 1 wherein: the first electromagnetic butterfly valve (15 a) in the air inlet pipe (15) is used for adjusting the air inlet speed into the air chamber (14), and the first electromagnetic butterfly valve (15 a) is used for adjusting the air inlet speed and comprises two stages: the air inlet speed is adjusted to be 5-10m/s in the first stage, and the air inlet speed is adjusted to be 15-20m/s in the second stage; and a second electromagnetic butterfly valve (10 a) in the air inlet pipe (10) is used for adjusting the air inlet speed into the grinding chamber (61), and the air inlet speed is adjusted to be 10-15 m/s.
4. The rotary fluidized bed grinding mill of claim 1 wherein: and round holes with the aperture ratio of 10-20% are uniformly distributed on the gas distribution plate (13).
5. The rotary fluidized bed grinding mill of claim 1 wherein: the lower part of the grinding cylinder body (6) is cylindrical, the diameter is 1000mm, and the height is 2000 mm; the upper part is conical, and the cone angle is 120 degrees.
6. The rotary fluidized bed grinding mill of claim 5 wherein: the grinding balls (12) are hollow silicon carbide spheres, the number of the grinding balls is 1, and the diameter of each grinding ball (12) is 50 mm.
7. The rotary fluidized bed grinding mill of claim 1 wherein: the number of the tangential air inlet pipes (19) is six.
8. The rotary fluidized bed grinding mill of claim 1 wherein: the raw material feeding port (9) is internally provided with a first check valve (8 a), and the bottom flow port (5) of the primary classification cyclone (4) is provided with a second check valve (8 b) at the joint of the pipeline and the side wall of the grinding chamber (61).
9. A method for grinding and pulverizing by a rotary fluidized bed, characterized in that the grinding and pulverizing are carried out by using the rotary fluidized bed grinding and pulverizing apparatus according to any one of claims 1 to 8, comprising the steps of:
the method comprises the following steps that firstly, a first fan (17) is started, the air flow speed of an air inlet pipe (15) is adjusted to be within the range of 5-10m/s by adjusting a first electromagnetic butterfly valve (15 a), and ascending air flow is formed in a grinding chamber (61) through an air distribution plate (13); starting a second fan (16), adjusting the air flow speed of the air inlet pipe (10) to be within the range of 10-15m/s by adjusting two second electromagnetic butterfly valves (10 a), and forming rotary air flow in the grinding chamber (61) through a tangential air inlet pipe (19) to promote the grinding balls (12) to do centrifugal rotary motion along the grinding wall (11);
feeding the raw materials into a grinding chamber (61) through a raw material feeding hole (9) and then feeding the raw materials onto a gas distribution plate (13); the raw materials are in a dispersed state under the action of the ascending air flow and do centrifugal rotation motion under the action of the rotating air flow, the materials are collided with each other and ground by friction, and the materials are ground into proper size fraction by mutual grinding between the grinding balls (12) and the grinding wall (11);
thirdly, adjusting the air flow speed of the air inlet pipe (15) to be within the range of 15-20m/s by adjusting a first electromagnetic butterfly valve (15 a), enabling the ground and crushed materials to be in a elutriation state under the action of ascending air flow, ascending to the top of a grinding chamber (61), entering a first-stage classification cyclone (4) through a discharge port (7), enabling fine particles to enter a second-stage classification cyclone (1) through an overflow port of the first-stage classification cyclone (4), and enabling qualified particle-grade materials to be discharged as finished products through a bottom flow port (3) of the second-stage classification cyclone; wherein, the coarse particles enter the grinding chamber (61) again through the underflow opening (5) of the primary classifying cyclone to participate in the next grinding and crushing process;
and step four, when no finished product is produced at the underflow port (3) of the secondary classification cyclone, the whole grinding and crushing process is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010304603.6A CN111495546B (en) | 2020-04-17 | 2020-04-17 | Grinding and crushing device and method for rotary fluidized bed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010304603.6A CN111495546B (en) | 2020-04-17 | 2020-04-17 | Grinding and crushing device and method for rotary fluidized bed |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111495546A CN111495546A (en) | 2020-08-07 |
| CN111495546B true CN111495546B (en) | 2021-12-10 |
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| CN112191191A (en) * | 2020-09-27 | 2021-01-08 | 毛学明 | Quick granulation method of traditional Chinese medicine extract |
| CN112191333A (en) * | 2020-10-22 | 2021-01-08 | 长沙万荣粉体设备科技有限公司 | Dry grinding device and grinding method |
| CN112304031B (en) * | 2020-11-12 | 2022-03-01 | 哈尔滨工业大学 | Cyclone fluidized bed dryer for rapidly drying large-particle materials |
| CN114505148B (en) * | 2022-02-08 | 2023-02-28 | 苏州锦艺新材料科技股份有限公司 | Production device for surface modification of silicon micropowder |
| CN114588989B (en) * | 2022-02-10 | 2023-06-06 | 山东高速集团有限公司创新研究院 | Fly ash processing equipment and preparation method |
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