Vibration fluidization sorting machine and sorting method for lean fine miscellaneous slack coal

Abstract

The invention discloses a vibration fluidization sorting machine and a sorting method for lean fine miscellaneous slack coal, belongs to the technical field of coal dry sorting, and aims to solve the problems of poor sorting effect and resource waste of lean fine miscellaneous slack coal with the particle size of 0.5-13mm in the prior art. According to the sorting machine, an inner cavity of a vibration excitation machine body is divided into a main sorting area not provided with a separation grid plate and a re-sorting air distribution piece and a re-sorting area provided with a separation grid plate and a re-sorting air distribution piece, and the re-sorting area is divided into a roughing clean coal chamber, a re-sorting chamber and a gangue channel which are sequentially arranged from top to bottom through the separation grid plate and the re-sorting air distribution piece. According to the separation method, in the main separation area, the raw coal is layered in the longitudinal direction in the vibration excitation machine body, the mixture of the middling coal and the re-separation clean coal enters the re-separation chamber to be subjected to second-stage separation, and the mixture of the middling coal and the re-separation clean coal is layered again. The invention can be used for sorting lean fine miscellaneous slack coal.

Description

Technical Field

[0001] The present invention belongs to the technical field of dry coal separation, and particularly relates to a vibrating fluidized bed separator and a separation method for poor, fine and miscellaneous coal slime. Background Art

[0002] At present, the yield of poor, fine and miscellaneous coal slime in China accounts for more than 40% of the raw coal yield, and it has the characteristics of high ash content, small particle size, fine embedded particle size, etc.

[0003] At present, the dry coal separation technologies mainly include air dense medium separation, optoelectronic separation, wind separation and other technologies, which have the advantages of not using water and less pollution. Among them, the air dense medium separation technology uses air and heavy medium as the separation medium, and has high separation accuracy. However, it is only applicable to the separation of easy-to-separate coal with a particle size greater than 6 mm; the optoelectronic separation technology mainly uses the difference in the ray absorption ability and color difference of coal gangue for separation, with less pollution. However, the separation efficiency for materials with a particle size less than 25 mm is relatively low; the wind separation technology uses air flow as the separation medium, has a wide feed particle size range, and a simple process. The lower limit of the separation particle size for easy-to-separate coal is 6 mm, and the lower limit of the separation particle size for difficult-to-separate coal is 13 mm.

[0004] As the particle size of the material particles decreases, the separation accuracy decreases, the separation effect of coal and gangue becomes worse, and it is impossible to achieve clean and efficient separation and utilization of coal slime (difficult-to-separate coal) with a particle size of 0.5 - 13 mm, resulting in a great waste of coal resources. Summary of the Invention

[0005] In view of the above analysis, the present invention aims to provide a vibrating fluidized bed separator and a separation method for poor, fine and miscellaneous coal slime, so as to solve the problems of poor separation effect and resource waste of poor, fine and miscellaneous coal slime with a particle size of 0.5 - 13 mm in the prior art.

[0006] The object of the present invention is mainly achieved through the following technical solutions.

[0007] The present invention provides a vibrating fluidized bed separator for poor, fine and miscellaneous coal slime, which includes a vibrating body, a main air distribution member, a partition grate and a re-selection air distribution member. The partition grate and the re-selection air distribution member are arranged on one side inside the vibrating body from top to bottom; the inner cavity of the vibrating body is divided into a main selection area without the partition grate and the re-selection air distribution member and a re-selection area with the partition grate and the re-selection air distribution member. The partition grate and the re-selection air distribution member divide the re-selection area into a rough separation clean coal chamber, a re-selection chamber and a gangue channel arranged in sequence from top to bottom; the main selection area is provided with a raw coal feed port and a gangue discharge port, the gangue discharge port in the main selection area is connected to the gangue channel, the rough separation clean coal chamber is provided with a rough separation clean coal discharge port, and the re-selection chamber is provided with a middling coal discharge port and a re-selection clean coal discharge port.

[0008] Furthermore, the main air distribution component includes a main air distribution chamber fixedly connected to the vibration excitation body, and a main air distribution plate covering the air outlet of the main air distribution chamber. One end of the main air distribution plate close to the gangue discharge port is rotatably connected to the main air distribution support. The main air distribution chamber includes a first elastic ring, a second elastic ring, a first sub-tube, and a second sub-tube sleeved outside the first sub-tube. The main air distribution plate is divided into a central area and a peripheral area surrounding the central area. The peripheral area is provided with main air distribution holes, and the central area is not provided with main air distribution holes. The air outlet of the first sub-tube covers the central area, and the first sub-tube is connected to the edge of the central area through the first elastic ring. An air extraction pump is provided on the first sub-tube. The air outlet of the second sub-tube covers the peripheral area, and the second sub-tube is connected to the edge of the peripheral area through the second elastic ring. When it is necessary to increase the inclination angle of the main air distribution plate, the air extraction pump is turned on, and at the same time, air flow is introduced into the first sub-tube and the second sub-tube, so that the lengths of the first elastic ring and the second elastic ring increase, and the inclination angle of the main air distribution plate increases.

[0009] Furthermore, the re-selection air distribution component includes a re-selection air distribution plate. The re-selection air distribution plate includes an air distribution groove, a plate body, and partition ribs. The partition ribs are arranged in the air distribution groove and divide the air distribution groove into a plurality of air distribution sub-grooves. Air inlet holes are opened on each air distribution sub-groove, and the plate body covers the notch of the air distribution groove. Re-selection air distribution holes are opened on the plate body.

[0010] Furthermore, one side of the re-selection air distribution plate facing the main selection area is inclined to form a tip.

[0011] Furthermore, the raw coal feed port is located on one side of the top of the main selection area far from the re-selection area; the gangue discharge port is located on one side of the bottom of the main selection area close to the re-selection area.

[0012] Furthermore, one end of the partition grate is connected to the side wall of the vibration excitation body, and the other end is suspended; one end of the re-selection air distribution component is connected to the side wall of the vibration excitation body, and the other end is suspended.

[0013] Furthermore, one end of the partition grate is rotatably connected to the side wall of the vibration excitation body; one end of the re-selection air distribution component is fixedly connected to the side wall of the vibration excitation body.

[0014] Furthermore, the above-mentioned vibrating fluidized bed separator for lean, fine and miscellaneous coal also includes a hanging unit and a vibration excitation unit. The vibration excitation body is elastically suspended on the hanging unit, and the output end of the vibration excitation unit is connected to the vibration excitation body.

[0015] Furthermore, the hanging unit includes a hanging frame, hanging ropes and shock-absorbing springs. The vibration excitation body is suspended on the hanging frame through the shock-absorbing springs and the hanging ropes in sequence.

[0016] The present invention also provides a vibrating fluidized bed separation method for lean, fine and miscellaneous coal. Using the above-mentioned vibrating fluidized bed separator for lean, fine and miscellaneous coal, the vibrating fluidized bed separation method includes the following steps: Step 1: The raw coal enters the main separation area from the raw coal feed inlet, and the air flow is supplied into the main separation area through the main air distribution component; Step 2: In the main separation area, the raw coal generates a stratification phenomenon longitudinally in the vibrating machine body. The roughly separated clean coal stays in the upper part of the main separation area, the gangue particles sink to the lower part of the main separation area, and the mixture of middlings and re-selected clean coal suspends at the middle position of the main separation area; Step 3: The raw coal is continuously added, and the gangue particles, roughly separated clean coal, middlings, and re-selected clean coal in the main separation area migrate horizontally; Step 4: The roughly separated clean coal enters the roughly separated clean coal chamber, and the gangue particles are discharged from the gangue discharge port and / or the gangue channel; Step 5: The air flow is supplied into the re-separation chamber through the re-separation air distribution component, and the mixture of middlings and re-selected clean coal enters the re-separation chamber for secondary separation. The mixture of middlings and re-selected clean coal is stratified again. The re-selected clean coal stays in the upper part of the re-separation chamber and is then discharged from the re-selected clean coal discharge port; The middlings stay in the lower part of the re-separation chamber and are then discharged from the middlings discharge port.

[0017] Compared with the prior art, the present invention can at least achieve one of the following beneficial effects: The vibrating fluidized bed separator for lean, fine and miscellaneous fine coal provided by the present invention divides the vibrating machine body into a main separation area, a roughly separated clean coal chamber, a re-separation chamber and a gangue channel through the setting of the partition grate plate and the re-separation air distribution component. Among them, the raw coal enters the main separation area for primary separation, and the separation of gangue particles, roughly separated clean coal, and the mixture of middlings and re-selected clean coal can be realized. The mixture of middlings and re-selected clean coal enters the re-separation chamber for secondary separation, and the separation of middlings and re-selected clean coal can be realized. At the same time, the full separation of gangue particles, roughly separated clean coal, re-selected clean coal and middlings is completed. The process flow is simple, the separation cost is low, and the problems of low separation accuracy and serious resource waste of 0.5 - 13 mm fine coal can be solved.

[0018] In the present invention, the above technical solutions can also be combined with each other to achieve more preferred combination schemes. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can be made obvious from the description, or understood by implementing the present invention. The purpose and other advantages of the present invention can be realized and obtained from the content specifically pointed out in the description of the embodiments and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings are only for the purpose of showing specific embodiments, and are not considered as a limitation to the present invention. Throughout the drawings, the same reference signs represent the same components; Figure 1 It is a schematic structural diagram of the vibrating fluidized bed separator for lean, fine and miscellaneous fine coal provided in Embodiment 1 of the present invention; Figure 2Schematic diagram of the structure of the re - selection air - distribution component in the vibrating fluidized bed separator for lean, fine and miscellaneous coal provided in the first embodiment of the present invention; Figure 3 Schematic diagram of the structure of the main air - distribution chamber in the vibrating fluidized bed separator for lean, fine and miscellaneous coal provided in the first embodiment of the present invention.

[0020] Reference numerals: Ⅰ - Main selection area; Ⅱ - Rough - selection clean - coal chamber; Ⅲ - Re - selection chamber; Ⅳ - Gangue passage; 101 - Vibration body; 1011 - Raw - coal feed inlet; 1012 - Dust outlet; 102 - Main air - distribution component; 1021 - Main air - distribution chamber; 1022 - Main air - distribution plate; 1023 - First elastic ring; 1024 - Second elastic ring; 1025 - First sub - pipe; 1026 - Second sub - pipe; 1027 - Air - extraction pump; 103 - Re - selection air - distribution component; 1031 - Air - distribution sub - groove; 1032 - Partition rib; 1033 - Air - inlet hole; 104 - Partition grate; 105 - Gangue discharge gate; 106 - Gangue discharge outlet; 201 - Hanging frame; 202 - Hanging rope; 203 - Shock - absorbing spring. Detailed implementation manners

[0021] The following will specifically describe the preferred embodiments of the present invention in conjunction with the attached drawings. The attached drawings form a part of the present invention and are used together with the embodiments of the present invention to explain the principle of the present invention, rather than to limit the scope of the present invention.

[0022] Embodiment 1 This embodiment provides a vibrating fluidized bed separator for lean, fine and miscellaneous coal. Refer to Figure 1 , which includes a vibration body 101, a main air - distribution component 102, a partition grate 104 and a re - selection air - distribution component 103. The partition grate 104 and the re - selection air - distribution component 103 are arranged on one side inside the vibration body 101 from top to bottom. The inner cavity of the vibration body 101 is divided into a main selection area I where the partition grate 104 and the re - selection air - distribution component 103 are not provided and a re - selection area where the partition grate 104 and the re - selection air - distribution component 103 are provided. The partition grate 104 and the re - selection air - distribution component 103 divide the re - selection area into a rough - selection clean - coal chamber Ⅱ, a re - selection chamber Ⅲ and a gangue passage IV arranged in sequence from top to bottom. The main selection area I is provided with a raw - coal feed inlet 1011 and a gangue discharge outlet 106. Among them, the raw - coal feed inlet 1011 is located at the top of the main selection area I, on the side far from the re - selection area, and the gangue discharge outlet 106 is located at the bottom of the main selection area I, on the side close to the re - selection area. The rough - selection clean - coal chamber Ⅱ is provided with a rough - selection clean - coal discharge outlet, and the re - selection chamber Ⅲ is provided with a middling - coal discharge outlet and a re - selection clean - coal discharge outlet (for example, an overflow weir). Considering the density of the middling - coal and the re - selection clean - coal, the re - selection clean - coal discharge outlet is located above the middling - coal discharge outlet.

[0023] Specifically, one end of the partition grate plate 104 is rotatably connected to the side wall of the vibration body 101, and the other end is suspended. One end of the re-selection air distribution member 103 is fixedly connected to the side wall of the vibration body 101, and the other end is suspended.

[0024] During implementation, raw coal enters the main selection area I from the raw coal feed inlet 1011, and air flow is supplied into the main selection area I from the main air distribution member 102; within the main selection area I, the raw coal is under the action of a combined force field of vibration force and air flow, and stratification occurs longitudinally within the vibration body 101 according to density differences. The light-density rough-selection clean coal stays at the upper part of the main selection area I, the heavy-density gangue particles sink to the lower part of the main selection area I, and the medium-density materials (including a mixture of medium coal and re-selection clean coal) are suspended at the middle position of the main selection area I; with the continuous addition of raw coal, the gangue particles, rough-selection clean coal, medium coal, and re-selection clean coal within the main selection area I are under the action of the thrust of the newly added raw coal and the vibration force and migrate horizontally; the rough-selection clean coal enters the rough-selection clean coal chamber II and is then discharged as clean coal product from the discharge outlet of the rough-selection clean coal chamber II, and the gangue particles are discharged from the gangue discharge outlet 106 and / or the gangue passage IV; air flow is supplied into the re-selection chamber III from the re-selection air distribution member 103, and the medium coal and re-selection clean coal enter the re-selection chamber III for secondary separation. The mixture of medium coal and re-selection clean coal is stratified again under the action of the combined force field of vibration force and air flow. The light-density re-selection clean coal stays at the upper part of the re-selection chamber III and is then discharged from the re-selection clean coal discharge outlet, and the heavy-density medium coal stays at the lower part of the re-selection chamber III and is then discharged from the medium coal discharge outlet.

[0025] Compared with the prior art, the vibration fluidized bed separator for lean, fine and miscellaneous fine coal provided in this embodiment divides the vibration body 101 into the main selection area I, the rough-selection clean coal chamber II, the re-selection chamber III, and the gangue passage IV through the setting of the partition grate plate 104 and the re-selection air distribution member 103. Among them, the raw coal enters the main selection area I for primary separation, and the separation of gangue particles, rough-selection clean coal, and the mixture of medium coal and re-selection clean coal can be realized. The mixture of medium coal and re-selection clean coal enters the re-selection chamber III for secondary separation, and the separation of medium coal and re-selection clean coal can be realized. At the same time, the full separation of gangue particles, rough-selection clean coal, re-selection clean coal, and medium coal is completed. The process flow is simple, the separation cost is low, and the problems such as low separation accuracy and serious resource waste of 0.5 - 13 mm fine coal can be solved.

[0026] In order to ensure the throughput and processing efficiency of the vibration fluidized bed separator for lean, fine and miscellaneous fine coal, exemplarily, the length of the vibration body 101 is 1500 - 2500 mm (for example, 2000 mm), the width is 450 - 550 mm (for example, 500 mm), and the height is 1000 - 1500 mm (for example, 1200 mm).

[0027] To facilitate the discharge of dust within the vibration body 101, a dust outlet 1012 is provided at the top of the vibration body 101. Exemplarily, the number of dust outlets 1012 is multiple (for example, two), enabling the smooth discharge of dust from the vibration body 101.

[0028] Regarding the structure of the main air distribution member 102, specifically, it includes a main air distribution chamber 1021 fixedly connected (e.g., welded) to the vibration body 101, a main air distribution plate 1022 covering the air outlet of the main air distribution chamber 1021, and a main air distribution bracket (e.g., a rigid bracket) for mounting the main air distribution plate 1022. Main air distribution holes are provided on the main air distribution plate 1022.

[0029] Considering that the gangue particles will move along the main air distribution plate 1022 to the gangue discharge port 106 and / or be discharged through the gangue channel IV, in order to be able to adjust the discharge speed of the gangue particles, exemplarily, one end of the main air distribution plate 1022 close to the gangue discharge port 106 is rotatably connected to the main air distribution bracket, and the other end of the main air distribution plate 1022 is a free end. By rotating the main air distribution plate 1022, the inclination angle of the main air distribution plate 1022 is adjusted, thereby realizing the adjustment of the discharge speed of the gangue particles.

[0030] Exemplarily, the inclination angle of the main air distribution plate 1022 is 0 - 25°. When the amount of gangue particles is greater than the gangue threshold, the main air distribution plate 1022 can be driven to rotate, increasing the inclination angle of the main air distribution plate 1022 and accelerating the migration speed of the gangue particles to avoid the occurrence of bed layer jamming.

[0031] In order to be able to adjust the inclination angle of the main air distribution plate 1022 using air flow, for the case where the number of main air distribution chambers 1021 is one, regarding the structure of the main air distribution chamber 1021, specifically, see Figure 3 , the main air distribution chamber 1021 includes a first elastic ring 1023, a second elastic ring 1024, a first sub - tube 1025, and a second sub - tube 1026 sleeved outside the first sub - tube 1025. There is a gap between the second sub - tube 1026 and the first sub - tube 1025. The main air distribution plate 1022 is divided into a central region and a peripheral region surrounding the central region. Main air distribution holes are provided in the peripheral region, and no main air distribution holes are provided in the central region. The air outlet of the first sub - tube 1025 covers the central region and is connected to the edge of the central region through the first elastic ring 1023. A suction pump 1027 is provided on the first sub - tube 1025. The air outlet of the second sub - tube 1026 covers the peripheral region and is connected to the edge of the peripheral region through the second elastic ring 1024.

[0032] When there is no need to increase the tilt angle of the main air distribution plate 1022, only the second sub-tube 1026 supplies air into the main selection area I through the main air distribution holes; when it is necessary to increase the tilt angle of the main air distribution plate 1022, the air extraction pump 1027 is turned on, and at the same time, airflows are introduced into the first sub-tube 1025 and the second sub-tube 1026, so that the lengths of the first elastic ring 1023 and the second elastic ring 1024 increase, the main air distribution plate 1022 rotates clockwise, and the tilt angle of the main air distribution plate 1022 increases. In this way, through the mutually cooperating first sub-tube 1025 and second sub-tube 1026, the pressure of the airflows can be used to drive the rotation of the main air distribution plate 1022, thereby realizing the adjustment of the tilt angle of the main air distribution plate 1022 by using airflows, without the need to be equipped with other additional driving mechanisms for the main air distribution plate 1022.

[0033] In order to ensure the stability of air distribution, exemplarily, the number of the main air distribution chambers 1021 is multiple (for example, two), the multiple main air distribution chambers 1021 are evenly arranged, and the longitudinal cross-sectional shape of the main air distribution chamber 1021 is an inverted trapezoid. In this way, through the setting of the multiple main air distribution chambers 1021, at the same time, the cross-sectional area of the main air distribution chamber 1021 gradually increases along the airflow movement direction, so as to buffer the airflow and effectively ensure the stability of air distribution.

[0034] Regarding the structure of the re-selection air distribution member 103, specifically, it includes a re-selection air distribution plate and a re-selection air distribution bracket (for example, a rigid bracket) for installing the re-selection air distribution plate, and re-selection air distribution holes are opened on the re-selection air distribution plate.

[0035] In order to improve the uniformity of air distribution, the re-selection air distribution plate includes an air distribution groove, a plate body and a dividing rib 1032, see Figure 2 , the dividing rib 1032 is arranged in the air distribution groove, divides the air distribution groove into multiple air distribution sub-grooves 1031, air inlet holes 1033 are opened on each air distribution sub-groove 1031, the plate body covers the notch of the air distribution groove, and the re-selection air distribution holes are opened on the plate body.

[0036] The air supply of the multiple air distribution sub-grooves 1031 is independently set, and the air supply speed can be adjusted separately according to the different thicknesses of the middling coal and the re-selection clean coal mixture at different positions, further improving the separation accuracy in the re-selection process.

[0037] Exemplarily, the dividing rib 1032 includes a transverse rib and a longitudinal rib, and the numbers of the transverse rib and the longitudinal rib are both one, so as to divide the air distribution groove into multiple air distribution sub-grooves 1031 arranged in a 2×2 pattern.

[0038] In order to minimize the occupation of the separation space by the re-selection air distribution plate, exemplarily, the height of the above-mentioned re-selection air distribution plate is 50 - 80 mm, and the shape of the air distribution sub-groove 1031 is a flat cube.

[0039] In order to improve the sorting accuracy and avoid the mixture of medium coal and re - selected clean coal from getting stuck on the side wall of the re - selection air distribution plate, resulting in material back - mixing, the above - mentioned re - selection air distribution plate is inclined towards the main selection area I, thus forming a tip to facilitate the precise sorting of gangue particles and the mixture of medium coal and re - selected clean coal.

[0040] In order to provide the discharging power for the rough - selected clean coal, for the structure of the partition grate 104, specifically, it includes a partition plate body, and driving air holes are opened on the partition plate body. Exemplarily, the aperture of the driving air holes is 4 - 8 mm (for example, 6 mm).

[0041] In order to be able to adjust the height of the dividing material layer between the mixture of medium coal and re - selected clean coal and the rough - selected clean coal, the above - mentioned partition plate body is rotatably connected to the side wall of the vibration body 101. By the relative rotation of the partition plate body, the size of the feed ports of the rough - selected clean coal chamber II and the re - selection chamber III can be adjusted, thereby realizing the adjustment of the height of the dividing material layer between the mixture of medium coal and re - selected clean coal and the rough - selected clean coal.

[0042] It should be noted that if the content of the rough - selected clean coal in the raw coal exceeds the rough - selected clean coal threshold range, rotate the partition plate body so that the free end of the partition plate body is lower than the connecting end, and the feed port of the rough - selected clean coal chamber II increases, increasing the processing capacity of the rough - selected clean coal; if the content of the mixture of medium coal and re - selected clean coal in the raw coal exceeds the mixture threshold range, rotate the partition plate body so that the free end of the partition plate body is higher than the connecting end, and the feed port of the re - selection chamber III increases, increasing the processing capacity of the mixture of medium coal and re - selected clean coal.

[0043] It can be understood that in order to be able to realize the vibration of the vibration body 101, the above - mentioned vibrating fluidized bed separator for lean, fine and miscellaneous coal also includes a hanging unit and a vibration exciting unit. The vibration body 101 is elastically suspended on the hanging unit, and the vibration exciting unit is arranged on both sides of the vibration body 101. The output end of the vibration exciting unit is connected to the vibration body 101, and is used to drive the vibration body 101 to vibrate in a certain direction, amplitude and frequency.

[0044] For the structure of the hanging unit, specifically, it includes a hanging frame 201, hanging ropes 202 and shock - absorbing springs 203. The vibration body 101 is successively suspended on the hanging frame 201 through the shock - absorbing springs 203 and the hanging ropes 202.

[0045] In order to be able to adjust the discharging capacity of gangue particles according to the amount of gangue particles, the above - mentioned vibrating fluidized bed separator for lean, fine and miscellaneous coal also includes a gangue discharge gate 105. There is a gap between the main air distribution member 102 (specifically referring to the main air distribution plate 1022) and the lower wall surface of the gangue channel IV. This gap serves as the gangue discharge port 106. One end of the gangue discharge gate 105 is rotatably connected to the side of the gangue channel IV close to the gap, and the other end is a free end.

[0046] Specifically, the waste rock gate 105 has a discharging mode, a channel mode, and a composite mode.

[0047] If the amount of waste rock particles is lower than the first threshold and the amount of waste rock particles is small, the waste rock gate 105 is in the discharging mode. Then, the free end of the waste rock gate 105 contacts the upper wall surface of the waste rock channel IV, the main selection area I is disconnected from the waste rock channel IV, the waste rock discharge port 106 is communicated with the main selection area I, and the waste rock particles are discharged from the waste rock discharge port 106. If the amount of waste rock particles is between the first threshold and the second threshold and the amount of waste rock particles is at an intermediate level, the waste rock gate 105 is in the channel mode. Then, the free end of the waste rock gate 105 contacts the main air distribution member 102, the waste rock discharge port 106 is disconnected from the main selection area I, the main selection area I is communicated with the waste rock channel IV, and the waste rock particles are discharged from the waste rock channel IV. If the amount of waste rock particles is higher than the second threshold and the amount of waste rock particles is large, the waste rock gate 105 is in the composite mode. Then, the free end of the waste rock gate 105 is suspended, both the waste rock discharge port 106 and the waste rock channel IV are communicated with the main selection area I, and the waste rock particles are discharged from both the waste rock discharge port 106 and the waste rock channel IV simultaneously.

[0048] Embodiment 2 This embodiment provides a vibration fluidized bed separation method for lean, fine and miscellaneous coal powder. The vibration fluidized bed separator for lean, fine and miscellaneous coal powder provided in Embodiment 1 is adopted. The vibration fluidized bed separation method includes the following steps: Step 1: Raw coal enters the main selection area I from the raw coal feed port 1011, and air flow is supplied into the main selection area I from the main air distribution member 102. Step 2: In the main selection area I, the raw coal is under the action of a combined force field of vibration force and air flow. According to the density difference, a stratification phenomenon occurs longitudinally in the vibration body 101. The coarse-selected clean coal with low density stays in the upper part of the main selection area I, the waste rock particles with high density sink to the lower part of the main selection area I, and the materials with intermediate density (including the mixture of medium coal and re-selected clean coal) are suspended in the middle position of the main selection area I. Step 3: With the continuous addition of raw coal, the waste rock particles, coarse-selected clean coal, medium coal and re-selected clean coal in the main selection area I are horizontally migrated under the action of the thrust of the newly added raw coal and the vibration force. Step 4: The coarse-selected clean coal enters the coarse-selected clean coal chamber II and is then discharged from the discharge port of the coarse-selected clean coal chamber II as the clean coal product. The waste rock particles are discharged from the waste rock discharge port 106 and / or the waste rock channel IV. Step 5: Air flow is supplied into the re-selection chamber III from the re-selection air distribution member 103, and the medium coal and re-selected clean coal enter the re-selection chamber III for secondary separation. The mixture of medium coal and re-selected clean coal is stratified again under the action of the combined force field of vibration force and air flow. The re-selected clean coal with low density stays in the upper part of the re-selection chamber III and is then discharged from the re-selected clean coal discharge port. The medium coal with high density stays in the lower part of the re-selection chamber III and is then discharged from the medium coal discharge port.

[0049] Compared with the prior art, the beneficial effects of the vibration fluidized separation method for lean, fine and miscellaneous pulverized coal provided in this embodiment are basically the same as those of the vibration fluidized separator for lean, fine and miscellaneous pulverized coal provided in Embodiment 1, and will not be elaborated here one by one.

[0050] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A vibrating fluidized separator for lean and fine coal, characterized in that: It comprises an exciting machine body, a main air distribution member, a partitioning grate plate and a re-selection air distribution member, wherein the partitioning grate plate and the re-selection air distribution member are arranged on one side of the exciting machine body from top to bottom; the inner cavity of the exciting machine body is divided into a main selection area where the partitioning grate plate and the re-selection air distribution member are not arranged, and a re-selection area where the partitioning grate plate and the re-selection air distribution member are arranged, and the partitioning grate plate and the re-selection air distribution member divide the re-selection area into a roughing clean coal chamber, a re-selection chamber and a gangue channel which are arranged in sequence from top to bottom; The main selection area is provided with a raw coal feed port and a gangue discharge port, the roughing clean coal chamber is provided with a roughing clean coal discharge port, and the reselection chamber is provided with a medium coal discharge port and a reselection clean coal discharge port.

2. The vibrating fluidized separator for lean and fine coal according to claim 1, characterized in that: The main air distribution member comprises a main air distribution chamber fixedly connected to the excitation body, and a main air distribution plate covering the air outlet of the main air distribution chamber, and one end of the main air distribution plate close to the gangue discharge port is rotatably connected to the main air distribution bracket; The main air distribution chamber includes a first elastic ring, a second elastic ring, a first sub-tube and a second sub-tube sleeved on the outside of the first sub-tube. The main air distribution plate is divided into a central area and a peripheral area surrounding the central area. The peripheral area is provided with main air distribution holes, and the central area is not provided with main air distribution holes. The air outlet of the first sub-tube covers the central area, and the first sub-tube is connected to the edge of the central area through the first elastic ring. The first sub-tube is provided with an air pump, and the air outlet of the second sub-tube covers the surrounding area, and the second sub-tube is connected to the edge of the surrounding area through the second elastic ring. When the inclination angle of the main air distribution plate needs to be increased, the air pump is turned on, and air flow is introduced into the first sub-tube and the second sub-tube at the same time, so that the lengths of the first elastic ring and the second elastic ring are increased, and the inclination angle of the main air distribution plate is increased.

3. The vibrating fluidized separator for lean fine coal according to claim 1, characterized in that: The reselected air distribution member includes a reselected air distribution plate; The reselected air distribution plate includes an air distribution slot, a plate body and dividing ribs. The dividing ribs are arranged in the air distribution slot to divide the air distribution slot into a plurality of air distribution sub-slots. Each air distribution sub-slot is provided with an air inlet hole. The plate body covers the notch of the air distribution slot, and the reselected air distribution hole is provided on the plate body.

4. The vibrating fluidized separator for lean fine coal according to claim 3, characterized in that: The secondary air distribution plate is tilted toward one side of the primary selection area to form a pointed end.

5. The vibrating fluidized separator for lean fine coal according to claim 1, characterized in that: The raw coal feed port is located at the top of the main selection area and away from the side of the reselection area; The gangue discharge port is located at the bottom of the main selection area and close to one side of the reselection area.

6. The vibrating fluidized separator for lean and fine coal according to claim 1, characterized in that: One end of the partition grate plate is connected to the side wall of the vibration excitation body, and the other end is suspended in the air; One end of the reselected air distribution member is connected to the side wall of the vibration machine body, and the other end is suspended in the air.

7. The vibrating fluidized separator for lean and fine coal according to claim 6, characterized in that: One end of the partition grate plate is rotatably connected to the side wall of the vibration excitation body; One end of the reselected air distribution member is fixedly connected to the side wall of the vibration excitation body.

8. The vibrating fluidized separator for lean fine coal according to any one of claims 1 to 7, characterized in that: It also includes a hanging unit and an exciting unit. The exciting body is elastically suspended on the hanging unit, and the output end of the exciting unit is connected to the exciting body.

9. The vibrating fluidized separator for lean and fine coal according to claim 8, characterized in that: The hanging unit comprises a hanging frame, a hanging rope and a shock absorbing spring, and the exciting body is hung on the hanging frame through the shock absorbing spring and the hanging rope in sequence.

10. A vibration fluidization separation method for lean and fine coal, characterized in that: The vibrating fluidized separation machine for the lean and fine coal as claimed in any one of claims 1 to 9 is used, and the vibrating fluidized separation method comprises the following steps: Step 1: Raw coal enters the main selection area from the raw coal feed port, and airflow is supplied into the main selection area from the main air distribution member; Step 2: In the main selection area, the raw coal is stratified in the longitudinal direction of the vibration machine, the roughing clean coal stays in the upper part of the main selection area, the gangue particles sink to the lower part of the main selection area, and the mixture of the medium coal and the re-selected clean coal is suspended in the middle of the main selection area; Step 3: the raw coal is continuously added, and the gangue particles, rougher clean coal, medium coal and re-clean coal in the main selection area migrate horizontally; Step 4: the roughing clean coal enters the roughing clean coal chamber, and the gangue particles are discharged from the gangue discharge port and / or the gangue channel; Step 5: The airflow is supplied into the re-selection chamber from the re-selection air distribution member, and the mixture of the medium coal and the re-selected clean coal enters the re-selection chamber for second-stage separation. The mixture of the medium coal and the re-selected clean coal is layered again, and the re-selected clean coal stays in the upper part of the re-selection chamber and is then discharged from the re-selected clean coal discharge port; The medium coal stays in the lower part of the reselection chamber and is then discharged from the medium coal discharge port.

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