CN114308659A - Magnetic auxiliary gas-solid interference fluidized bed sorting device - Google Patents
Magnetic auxiliary gas-solid interference fluidized bed sorting device Download PDFInfo
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- CN114308659A CN114308659A CN202210027687.2A CN202210027687A CN114308659A CN 114308659 A CN114308659 A CN 114308659A CN 202210027687 A CN202210027687 A CN 202210027687A CN 114308659 A CN114308659 A CN 114308659A
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Abstract
The invention discloses a magnetic auxiliary gas-solid interference fluidized bed separation device, and belongs to the technical field of coal dust separation. The separation device comprises a fluidized bed separation chamber, an air distribution plate, an air chamber, a medium feeding device and a coal powder feeding device which are sequentially designed from top to bottom; the discharge wheel of the light product discharge unit is positioned below the feed inlet at the top of the fluidized bed separation chamber, the overflow groove is formed in the outer peripheral wall at the top of the fluidized bed separation chamber and communicated with the fluidized bed separation chamber, the sweeper is positioned in the overflow groove and fixedly connected with the discharge wheel, and a plurality of light product discharge ports are formed in the bottom of the overflow groove; the upper end of the heavy product discharge channel is communicated with the fluidized bed separation chamber, and the bottom of the heavy product discharge channel extends to the bottom of the air chamber; the magnetic auxiliary unit is a Helmholtz coil arranged on the periphery of the fluidized bed separation chamber, and the Helmholtz coil is connected with a direct current stabilized power supply. The magnetic-assisted gas-solid interference fluidized bed separation device realizes the separation and enrichment of fine coal particles according to density.
Description
Technical Field
The invention relates to the technical field of pulverized coal separation, in particular to a magnetic auxiliary gas-solid interference fluidized bed separation device.
Background
The dry separation technology of the gas-solid fluidized bed can effectively separate coal with the granularity of more than 6mm, but cannot effectively separate coal with the granularity of less than 6mm, and cannot separate coal dust with the granularity of less than 3 mm. The reason is that it uses the coarser-sized Geldart group B magnetite powder as the weighting material. If the dry separation of coal with fine particles of less than 6mm or coal powder with less than 3mm is to be solved, magnetite powder with finer particle size, such as Geldart C-type magnetite powder, must be used as the heavy material. However, the Geldart C magnetite powder cannot be fluidized in a common gas-solid fluidized bed, so the invention provides a magnetic auxiliary gas-solid interference fluidized bed separation device.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provides a magnetic auxiliary gas-solid interference fluidized bed separation device.
The invention provides a magnetic auxiliary gas-solid interference fluidized bed sorting device, which comprises:
the separation unit comprises a fluidized bed separation chamber, an air distribution plate and an air chamber which are sequentially designed from top to bottom, and the fluidized bed separation chamber, the air distribution plate and the air chamber are fixedly connected;
the feeding unit comprises a medium feeding device and a coal powder feeding device, and discharge ports of the medium feeding device and the coal powder feeding device are both positioned at the central position above the fluidized bed separation chamber;
the air supply unit is communicated with the air chamber and used for supplying air to the air chamber;
the light product discharge unit comprises a discharge wheel, an overflow groove, a sweeper and a plurality of light product discharge ports, the discharge wheel is positioned below a feed port at the top of the fluidized bed separation chamber, the overflow groove is formed in the outer peripheral wall at the top of the fluidized bed separation chamber and is communicated with the fluidized bed separation chamber, the sweeper is positioned in the overflow groove and is fixedly connected with the discharge wheel through a connecting rod, the plurality of light product discharge ports are formed in the bottom of the overflow groove, and the discharge wheel is driven by a motor;
the upper end of the heavy product discharge channel is communicated with the fluidized bed separation chamber, and the bottom of the heavy product discharge channel extends to the bottom of the air chamber;
and the magnetic auxiliary unit is arranged on a Helmholtz coil at the periphery of the fluidized bed separation chamber, and the Helmholtz coil is connected with a direct current stabilized power supply.
Preferably, the air supply unit comprises a roots blower, a pressure-stabilizing air bag and an annular air inlet pipe, the pressure-stabilizing air bag is connected with an air outlet of the roots blower, the air outlet of the pressure-stabilizing air bag is connected with the annular air inlet pipe, an air valve is further arranged between the pressure-stabilizing air bag and the annular air inlet pipe, the annular air inlet pipe is located between the inner side of the air chamber and the heavy product discharge channel, and a plurality of air outlets are uniformly formed in the annular air inlet pipe.
Preferably, the heavy product discharge channel is a horn-shaped channel with a small top and a large bottom, a gravity sensor and a discharge valve are arranged in the heavy product discharge channel, and the gravity sensor and the discharge valve are in signal connection with the control unit.
Preferably, the fluidized bed separation chamber is a cylindrical fluidized bed separation chamber, the air distribution plate is an inverted frustum-shaped air distribution plate, and the cone angle of the inverted frustum-shaped air distribution plate is greater than 160 °.
Preferably, the medium feeding device comprises a medium hopper and a medium conveyer, the pulverized coal feeding device comprises a pulverized coal hopper and a pulverized coal conveyer, and the medium conveyer and the pulverized coal conveyer are both arranged above the feeding hole at the top of the fluidized bed separation chamber.
Preferably, the discharge ports of the medium conveyor and the pulverized coal conveyor are both positioned at the central position above the fluidized bed separation chamber.
Preferably, the sweeper is connected with the connecting rod through a spring.
Preferably, the fluidized bed separation chamber, the air distribution plate and the air chamber are connected through bolts.
Preferably, the air distribution plate is double-layer, the aperture ratio is 20-30%, and the filter cloth is sandwiched between the air distribution plate and the filter cloth.
Preferably, the medium is Geldart C magnetite powder, and the granularity of the coal powder is less than 3 mm.
Compared with the prior art, the invention has the beneficial effects that: the magnetic-assisted gas-solid interference fluidized bed separation device utilizes a Helmholtz coil to provide a uniform magnetic field, so that Geldart C magnetite powder forms a stable separation fluidized bed under the action of airflow and the magnetic field. The annular air inlet pipes are uniformly perforated at intervals and are blown back downwards, so that air flow entering the fluidized bed is more uniformly distributed. The feeder evenly feeds from the central position above the fluidized bed, and the feeding amount is adjustable. The cone angle of the inverted frustum-shaped air distribution plate is more than 160 degrees, so that air flow can uniformly penetrate through the air distribution plate to maintain stable separation of the fluidized bed, and a bottom medium and a heavy product can be converged to the middle part and discharged out of the fluidized bed. The light products and part of the medium flow into the overflow chute through the action of the discharge wheel and cross the edge of the cylindrical fluidized bed, and the light products and the medium are collected to the lowest end of the overflow chute by the sweeper and discharged from the discharge port. The heavy products and part of the medium are gathered to the bottom center of the fluidized bed under the action of gravity, and a discharge valve is controlled by a sensor to automatically open and close the discharge. The discharge pipe is designed to be in a horn shape with a small upper part and a big lower part, so that blockage during discharge of heavy products is prevented. When the coal dust with the size of less than 3mm is separated in the magnetic auxiliary gas-solid fluidized bed, the coal dust can be interfered to settle, light products and heavy products respectively float and sink, effective separation is realized through the discharging mechanism, and the separation lower limit of the coal dust can break through 0.5mm by the separation device.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the annular air inlet duct of the present invention;
FIG. 3 is a schematic structural view of the air distribution plate of the present invention;
FIG. 4 is a schematic view of the light product discharge mechanism of the present invention;
fig. 5 is a schematic structural view of the heavy product discharge mechanism of the present invention.
Description of reference numerals:
1. the device comprises a fluidized bed separation chamber, 2. an air distribution plate, 3. an air chamber, 5. a medium feeding device, 51. a medium hopper, 52. a medium conveyor, 6. a coal powder feeding device, 61. a coal powder hopper, 62. a coal powder conveyor, 7. a discharging wheel, 8. an overflow groove, 9. a sweeper, 10. a light product discharging port, 11. a heavy product discharging channel, 12. a Helmholtz coil, 13. an annular air inlet pipe, 14. an air outlet, 15. a discharging valve, 16. a spring, 17. a bolt and 18. a bolt hole.
Detailed Description
Detailed description of the preferred embodimentsthe following detailed description of the present invention will be made with reference to the accompanying drawings 1-5, although it should be understood that the scope of the present invention is not limited to the specific embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The invention provides a magnetic auxiliary gas-solid interference fluidized bed separation device which comprises a separation unit, wherein the separation unit comprises a fluidized bed separation chamber 1, an air distribution plate 2 and an air chamber 3 which are sequentially designed from top to bottom, and the fluidized bed separation chamber 1, the air distribution plate 2 and the air chamber 3 are fixedly connected;
the feeding unit comprises a medium feeding device 5 and a coal powder feeding device 6, and discharge ports of the medium feeding device 5 and the coal powder feeding device 6 are both positioned at the central position above the fluidized bed separation chamber 1;
the air supply unit is communicated with the air chamber 3 and is used for supplying air to the air chamber 3;
the light product discharge unit comprises a discharge wheel 7, an overflow groove 8, a sweeper 9 and a plurality of light product discharge ports 10, wherein the discharge wheel 7 is positioned below a feed inlet at the top of the fluidized bed separation chamber 1, the overflow groove 8 is arranged on the outer peripheral wall at the top of the fluidized bed separation chamber 1, the overflow groove 8 is communicated with the fluidized bed separation chamber 1, the sweeper 9 is positioned in the overflow groove 8 and is fixedly connected with the discharge wheel 7 through a connecting rod, and the plurality of light product discharge ports 10 are all arranged at the bottom of the overflow groove 8;
a heavy product discharge channel 11, the upper end of which is communicated with the fluidized bed separation chamber 1, and the bottom of which extends to the bottom of the air chamber 3;
and a magnetic auxiliary unit, wherein the magnetic auxiliary unit is a Helmholtz coil 12 arranged on the periphery of the fluidized bed separation chamber 1, and the Helmholtz coil 12 is connected with a direct current stabilized power supply.
In this embodiment, direct current is input into the helmholtz coil to form a uniform magnetic field in a certain region inside the coil, so that the Geldart C magnetite powder forms a stable separation fluidized bed under the action of airflow and the magnetic field. The coal powder with the particle size of less than 3mm is subjected to interference sedimentation in the magnetic auxiliary gas-solid fluidized bed, the light product and the heavy product respectively float and sink, effective separation is realized, and the separation lower limit of the coal powder can break through 0.5mm by the separation device.
Further, the air supply unit comprises a roots blower, a pressure-stabilizing air bag and an annular air inlet pipe 13, the pressure-stabilizing air bag is connected with an air outlet of the roots blower, the air outlet of the pressure-stabilizing air bag is connected with the annular air inlet pipe 13, an air valve is further arranged between the pressure-stabilizing air bag and the annular air inlet pipe 13, the annular air inlet pipe 13 is positioned between the inner side of the air chamber 3 and the heavy product discharge channel 11, and a plurality of air outlets 14 are uniformly formed in the annular air inlet pipe 13.
Further, heavy product discharge channel 11 is big end down's horn shape passageway, and is equipped with gravity sensor and discharge valve 15 in the heavy product discharge channel 11, gravity sensor and discharge valve 15 all with the control unit signal connection.
Further, the fluidized bed separation chamber 1 is a cylindrical fluidized bed separation chamber, the air distribution plate 2 is an inverted-frustum-shaped air distribution plate, and the cone angle of the inverted-frustum-shaped air distribution plate is larger than 160 degrees.
Further, the medium feeding device 5 comprises a medium hopper 51 and a medium conveyer 52, the pulverized coal feeding device 6 comprises a pulverized coal hopper 61 and a pulverized coal conveyer 62, and the medium conveyer 52 and the pulverized coal conveyer 62 are both arranged above a feeding hole at the top of the fluidized bed separation chamber 1.
Further, the discharge ports of the medium conveyor 52 and the pulverized coal conveyor 62 are both located at the central position above the fluidized bed separation chamber 1.
Further, the sweeper 9 is connected with the connecting rod through a spring 16.
Further, the fluidized bed separation chamber 1, the air distribution plate 2 and the air chamber 3 are connected through bolts.
Furthermore, the air distribution plate 2 is double-layer, the aperture ratio is 20-30%, and filter cloth is sandwiched between the air distribution plate and the air distribution plate.
Further, the medium is Geldart C type magnetite powder, and the granularity of the coal powder is less than 3 mm.
The magnetic auxiliary unit comprises a direct current stabilized power supply and a Homholtz coil. The direct current stabilized voltage supply inputs direct current to the Homholtz coil to generate a stabilized magnetic field. The voltage is adjustable, and the magnetic field intensity is adjustable.
The air supply unit comprises a Roots blower, a pressure-stabilizing air bag, an air valve, an air chamber and an annular air inlet pipe. In order to ensure uniform air distribution in the air chamber, the air inlet pipe is encircled for a circle between the gangue discharge pipe and the wall of the air chamber, and holes are uniformly formed in the air inlet pipe at intervals to blow air downwards.
The feeding unit comprises a medium hopper, a medium feeder, a coal powder hopper and a coal powder feeder. The medium is Geldart C type magnetite powder, and the granularity of the coal powder is less than 3 mm. The feeder can feed evenly, and the feed rate is adjustable. Feeding from a central position above the fluidized bed.
The sorting unit comprises a cylindrical fluidized bed sorting chamber and an inverted frustum-shaped air distribution plate. The separation chamber, the air distribution plate and the air chamber are fixedly connected by bolts. The cone angle of the inverted frustum-shaped air distribution plate is more than 160 degrees, so that air flow can uniformly penetrate through the air distribution plate to maintain stable separation of the fluidized bed, and a bottom medium and a heavy product can be converged to the middle part and discharged out of the fluidized bed. The air distribution plate has two layers with 20-30% of aperture ratio and a filter cloth sandwiched therebetween.
The light product discharging unit comprises an overflow chute, a discharging wheel and a sweeper. The light products and part of the medium flow into the overflow chute through the action of the discharge wheel, cross the cylindrical fluidized bed edge, are collected to the lowest end of the overflow chute by the sweeper and are discharged from the discharge port. The sweeper and the discharging thumb wheel move coaxially and in the same direction.
The heavy product discharge unit comprises a discharge valve and a discharge tube. The heavy products and part of the medium are gathered to the bottom center of the fluidized bed under the action of gravity, and a discharge valve is controlled by a sensor to automatically open and close the discharge. The discharge pipe is designed to be in a horn shape with a small upper part and a big lower part, so that blockage during discharge of heavy products is prevented.
The separation principle and the working process of the invention are as follows:
the sorting principle is as follows: firstly, a certain amount of fine magnetite powder (Geldart C type particles) is added into a sorting chamber, and the fine magnetite powder is formed into particles with a certain density (rho) under the action of airflow and an external magnetic field0) To a pseudo-fluid fluidized bed. Fine coal particles of-3 mm size fraction were then added to the sorting chamber. The fine coal particles are disturbed and settled in the quasi-fluid fluidized bed, and the density is less than rho0The light product floats on the upper layer of the sorting chamber and has the density larger than rho0The heavy products can be settled to the bottom of the separation chamber and are respectively discharged out of the separation chamber by a discharging mechanism, so that the separation and enrichment of the fine coal particles according to the density can be realized.
The working process is as follows: the fine magnetite powder (Geldart C granules) in the media hopper is fed uniformly and quantitatively from the center of the separation chamber via the media feeder. The air flow generated by the Roots blower is firstly stabilized by the pressure stabilizing air bag and then uniformly enters the air chamber through the annular air inlet pipe under the control of the air valve. A plurality of lower blowing openings are uniformly distributed on the annular air inlet pipe, air flow is blown back downwards and then is uniformly distributed in the air chamber. The airflow in the air chamber uniformly enters the separation chamber through the inverted cone-shaped air distribution plate to fluidize the fine magnetite powder. The direct current stabilized voltage supply inputs direct current to the Homholtz coil to generate a stable magnetic field with adjustable strength and assist the gas-solid fluidized bed formed by the fine magnetite powder. The fine magnetite powder is stably fluidized under the coupling action of airflow and a magnetic field to form a quasi-fluid gas-solid fluidized bed with uniform and stable density and fluid property. The media feed is increased to allow the fluidized magnetite powder to fill the separation chamber and overflow.
And (3) quantitatively feeding the-3 mm fine coal in the coal powder hopper into the separation chamber through a coal powder feeder. The materials with different densities in the coal powder are subjected to interference sedimentation in the quasi fluid fluidized bed to be layered according to the densities and move towards different directions. The light product with density less than the density of the quasi-fluid fluidized bed moves to the upper layer of the sorting chamber, moves to the edge of the sorting chamber along with the overflow of the fine magnetite powder, and is scraped out of the sorting chamber by a discharge wheel to enter an overflow groove. And then collected by a sweeper to a light product discharge port for discharge. Heavy products with a density greater than the density of the pseudo-fluid fluidized bed settle towards the bottom of the sorting chamber. The bottom structure of the separation chamber is an inverted frustum-shaped air distribution plate, namely the periphery is high, the middle is low, and the heavy products are collected to a heavy product discharge port when being settled to the bottom of the separation chamber. The discharge valve of the heavy product discharge port is controlled by a sensor to automatically open and close the discharge. When the weight product is accumulated at the discharge opening and exceeds a set maximum weight value, the discharge valve is opened to discharge the weight product and part of the magnetite powder. When the material at the discharge opening is lower than the set minimum weight value, the discharge valve is closed. The discharge pipe is designed to be in a horn shape with a small upper part and a big lower part, so that blockage during discharge of heavy products is prevented.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A magnetic assisted gas-solid interference fluidized bed separation device is characterized by comprising:
the separation unit comprises a fluidized bed separation chamber (1), an air distribution plate (2) and an air chamber (3) which are sequentially designed from top to bottom, wherein the fluidized bed separation chamber (1), the air distribution plate (2) and the air chamber (3) are fixedly connected;
the feeding unit comprises a medium feeding device (5) and a coal powder feeding device (6), and discharge holes of the medium feeding device (5) and the coal powder feeding device (6) are both positioned at the center position above the fluidized bed separation chamber (1);
the air supply unit is communicated with the air chamber (3) and is used for supplying air to the air chamber (3);
the light product discharge unit comprises a discharge wheel (7), an overflow groove (8), a sweeper (9) and a plurality of light product discharge openings (10), wherein the discharge wheel (7) is positioned below a feed inlet at the top of the fluidized bed separation chamber (1), the overflow groove (8) is formed in the outer peripheral wall at the top of the fluidized bed separation chamber (1), the overflow groove (8) is communicated with the fluidized bed separation chamber (1), the sweeper (9) is positioned in the overflow groove (8) and is fixedly connected with the discharge wheel (7) through a connecting rod, the plurality of light product discharge openings (10) are all arranged at the bottom of the overflow groove (8), and the discharge wheel (7) is driven by a motor;
the upper end of the heavy product discharge channel (11) is communicated with the fluidized bed separation chamber (1), and the bottom of the heavy product discharge channel extends to the bottom of the air chamber (3);
and the magnetic auxiliary unit comprises a Helmholtz coil (12) arranged on the periphery of the fluidized bed separation chamber (1), and the Helmholtz coil (12) is connected with a direct current stabilized power supply.
2. The magnetic-assisted gas-solid interference fluidized bed separation device as claimed in claim 1, wherein the air supply unit comprises a roots blower, a pressure-stabilizing air bag and an annular air inlet pipe (13), the pressure-stabilizing air bag is connected with the air outlet of the roots blower, the air outlet of the pressure-stabilizing air bag is connected with the annular air inlet pipe (13), an air valve is further arranged between the pressure-stabilizing air bag and the annular air inlet pipe (13), the annular air inlet pipe (13) is positioned between the inner side of the air chamber (3) and the heavy product discharge channel (11), and the annular air inlet pipe (13) is uniformly provided with a plurality of air outlets (14).
3. The magnetic-assisted gas-solid interference fluidized bed separation device according to claim 1, wherein the heavy product discharge channel (11) is a trumpet-shaped channel with a small top and a big bottom, a gravity sensor and a discharge valve (15) are arranged in the heavy product discharge channel (11), and the gravity sensor and the discharge valve (15) are in signal connection with the control unit.
4. A magnetically assisted gas-solid interfering fluidized bed separation unit according to claim 1, characterized in that the fluidized bed separation chamber (1) is a cylindrical fluidized bed separation chamber, the air distribution plate (2) is an inverted truncated cone shaped air distribution plate, and the angle of taper of the inverted truncated cone shaped air distribution plate is >160 °.
5. The magnetic-assisted gas-solid interference fluidized bed separation device according to claim 1, wherein the medium feeding device (5) comprises a medium hopper (51) and a medium conveyer (52), the pulverized coal feeding device (6) comprises a pulverized coal hopper (61) and a pulverized coal conveyer (62), and the medium conveyer (52) and the pulverized coal conveyer (62) are both arranged above a feeding port at the top of the fluidized bed separation chamber (1).
6. The magnetic-assisted gas-solid interference fluidized bed separation device according to claim 1, wherein the discharge ports of the medium conveyor (52) and the pulverized coal conveyor (62) are positioned at the central position above the fluidized bed separation chamber (1).
7. A magnetically assisted gas-solid disturbed fluidized bed sorting device according to claim 1, characterized in that the sweeper (9) is connected to the connecting rod by means of a spring (16).
8. The magnetic-assisted gas-solid interference fluidized bed separation device according to claim 1, wherein the fluidized bed separation chamber (1), the air distribution plate (2) and the air chamber (3) are connected by bolts.
9. The magnetic auxiliary gas-solid interference fluidized bed separation device according to claim 1, wherein the air distribution plate (2) is a double layer with an aperture ratio of 20-30% and a filter cloth sandwiched therebetween.
10. The magnetically assisted gas-solid disturbed fluidized bed separation device of claim 1, wherein the medium is Geldart C magnetite powder, and the size of the coal powder is less than 3 mm.
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| CN202210027687.2A CN114308659B (en) | 2022-01-11 | 2022-01-11 | Magnetic auxiliary gas-solid interference fluidized bed sorting device |
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| CN215354707U (en) * | 2021-06-16 | 2021-12-31 | 福建三明南方水泥有限公司 | Novel high-efficient selection powder device |
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| GB2070750A (en) * | 1979-12-21 | 1981-09-09 | Zucker & Staerkeind | Fluidised-bed drying of loose bulk materials in coarse pieces |
| CN2650894Y (en) * | 2003-11-12 | 2004-10-27 | 刘伟 | Fine coal ash dry separating classifier |
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| CN215354707U (en) * | 2021-06-16 | 2021-12-31 | 福建三明南方水泥有限公司 | Novel high-efficient selection powder device |
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