Vibrating fluidized separator and separation method for lean and fine coal

Abstract

The present invention discloses a vibrating fluidized separator and separation method for lean, fine, and mixed coal, belonging to the technical field of dry coal separation, and is used to solve the problems of poor separation effect and waste of resources in the prior art for lean, fine, and mixed coal with a particle size of 0.5 to 13 mm. In the separator of the present invention, the inner cavity of the vibration body is divided into a main separation zone without a partitioning grate and a re-selection air distribution member, and a re-selection zone with a partitioning grate and a re-selection air distribution member. The partitioning grate and the re-selection air distribution member divide the re-selection zone into a coarse coal chamber, a re-selection chamber, and a gangue channel, which are sequentially arranged from top to bottom. In the separation method of the present invention, in the main separation zone, the raw coal is stratified in the longitudinal direction of the vibration body, and the mixture of medium coal and re-selected clean coal enters the re-selection chamber for two-stage separation, and the mixture of medium coal and re-selected clean coal is stratified again. The present invention can be used for the separation of lean, fine, and mixed coal.

Description

Technical Field

[0001] The invention belongs to the technical field of dry coal separation, and in particular relates to a vibration fluidized separation machine and a separation method for lean, fine and mixed coal. Background Art

[0002] At present, the production rate of lean, fine and mixed coal in my country accounts for more than 40% of the raw coal production rate, and has the characteristics of high ash content, small particle size and fine embedded particle size.

[0003] Currently, dry coal sorting technologies mainly include air-dense medium separation, photoelectric separation, and wind separation, which have advantages such as no water use and low pollution. Among them, air-dense medium separation uses air and weighting materials as separation media, and has high separation accuracy. However, it is only suitable for separation of easy-to-separate coal with a particle size greater than 6mm. Photoelectric separation mainly uses the differences in the absorption capacity and color of coal gangue to separate materials, and has low pollution. However, the separation efficiency is low for materials with a particle size less than 25mm. Wind separation uses airflow as the separation medium, has a wide feed size range, and is simple to process. The lower limit of separation particle size for easy-to-separate coal is 6mm, and the lower limit of separation particle size for difficult-to-separate coal is 13mm.

[0004] As the particle size of the material decreases, the sorting accuracy decreases, and the coal gangue separation effect becomes worse. It is impossible to achieve clean and efficient sorting and utilization of fine coal (difficult-to-sort coal) with a particle size of 0.5~13mm, resulting in a huge waste of coal resources. Summary of the Invention

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

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

[0007] The present invention provides a vibrating fluidized separator for lean, fine and mixed coal, comprising a vibrating body, a main air distribution member, a partitioning grate and a re-selection air distribution member, wherein the partitioning grate and the re-selection air distribution member are arranged on one side of the vibrating body from top to bottom; the inner cavity of the vibrating body is divided into a main selection area without the partitioning grate and the re-selection air distribution member and a re-selection area with the partitioning grate and the re-selection air distribution member, the partitioning grate and the re-selection air distribution member divide the re-selection area into a coarse selection 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 gangue discharge port of the main selection area is connected to the gangue channel, the rough selection clean coal chamber is provided with a coarse selection clean coal discharge port, and the re-selection chamber is provided with a medium 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 excitation body, 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 outside the first sub-tube, the main air distribution plate is divided into a central area and a surrounding area surrounding the central area, the surrounding area is provided with a main air distribution hole, and the central area is not provided with a main air distribution hole, the air outlet of the first sub-tube covers the central area, the first sub-tube is connected to the edge of the central area through the first elastic ring, an air suction pump is provided on the first sub-tube, 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 it is necessary to increase the inclination angle of the main air distribution plate, the air suction 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 length of the first elastic ring and the second elastic ring increases, and the inclination angle of the main air distribution plate increases.

[0009] Furthermore, the reselected air distribution component includes a reselected air distribution plate; the reselected air distribution plate includes an air distribution slot, a plate body and a dividing rib, the dividing rib is arranged in the air distribution slot, dividing 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 slot of the air distribution slot, and the reselected air distribution hole is provided on the plate body.

[0010] Furthermore, the air distribution plate is tilted toward one side of the main selection area to form a pointed end.

[0011] Furthermore, the raw coal feed port is located at the top of the main selection area, away from the reselection area; the gangue discharge port is located at the bottom of the main selection area, close to the reselection area.

[0012] Furthermore, one end of the partition grate plate is connected to the side wall of the vibration body, and the other end is suspended; and one end of the air distribution member is connected to the side wall of the vibration body, and the other end is suspended.

[0013] Furthermore, one end of the partition grate plate is rotatably connected to the side wall of the vibration machine body; and one end of the air distribution member is fixedly connected to the side wall of the vibration machine body.

[0014] Furthermore, the vibration fluidized separator for lean, fine and mixed coal further comprises 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.

[0015] Furthermore, the hanging unit includes a hanging frame, a hanging rope and a shock-absorbing spring, and the excitation body is hung on the hanging frame through the shock-absorbing spring and the hanging rope in sequence.

[0016] The present invention also provides a vibration fluidization separation method for lean and fine coal, using the above-mentioned vibration fluidization separation machine for lean and fine coal, and the vibration fluidization separation method comprises the following steps:

[0017] Step 1: Raw coal enters the main selection zone from the raw coal feed port, and airflow is supplied into the main selection zone from the main air distribution component;

[0018] Step 2: In the main selection area, the raw coal is stratified in the longitudinal direction of the vibration machine. The rougher 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.

[0019] Step 3: 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;

[0020] Step 4: The rougher clean coal enters the rougher clean coal chamber, and the gangue particles are discharged from the gangue discharge port and / or gangue channel;

[0021] Step 5: Air is supplied into the re-selection chamber from the re-selection air distribution member. The mixture of middling coal and re-selected clean coal enters the re-selection chamber for secondary separation. The mixture of middling coal and re-selected clean coal is separated into layers again. 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 outlet.

[0022] The medium coal stays in the lower part of the re-selection chamber and is then discharged from the medium coal outlet.

[0023] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0024] The vibrating fluidized separator for lean, fine and mixed coal provided by the present invention divides the vibration machine body into a main selection area, a coarse selection clean coal chamber, a reselection chamber and a gangue channel by setting a separation grate plate and a reselection air distribution member, wherein the raw coal enters the main selection area for a first-stage separation, which can realize the separation of gangue particles, coarse selection clean coal and a mixture of medium coal and reselected clean coal; the mixture of medium coal and reselected clean coal enters the reselection chamber for a second-stage separation, which can realize the separation of medium coal and reselected clean coal, and simultaneously completes the full separation of gangue particles, coarse selection clean coal, reselected clean coal and medium coal. The process flow is simple, the separation cost is low, and the problems of low separation accuracy and serious waste of resources of 0.5-13mm fine coal can be solved.

[0025] In the present invention, the above-mentioned technical solutions can be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages will become apparent from the description or be understood through practice of the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the embodiments of the description and the contents particularly pointed out in the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are only used for the purpose of illustrating specific embodiments and are not to be considered as limiting the present invention. Throughout the drawings, the same reference symbols denote the same components.

[0027] Figure 1 A schematic structural diagram of a vibrating fluidized separator for lean, fine, and mixed coal provided in Example 1 of the present invention;

[0028] Figure 2 A schematic structural diagram of a reselection air distribution member in a vibrating fluidized separator for lean, fine coal provided in Example 1 of the present invention;

[0029] Figure 3 This is a schematic structural diagram of the main air distribution chamber in the vibration fluidized separator for lean, fine coal provided in Example 1 of the present invention.

[0030] Reference numerals:

[0031] Ⅰ-main selection area; Ⅱ-roughing and clean coal selection chamber; Ⅲ-reselection chamber; Ⅳ-waste rock channel;

[0032] 101-excitation body; 1011-raw coal feed port; 1012-dust outlet; 102-main air distribution element; 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 pump; 103-reselected air distribution element; 1031-air distribution sub-trough; 1032-dividing rib; 1033-air inlet; 104-partitioning grate; 105-waste discharge gate; 106-waste discharge port;

[0033] 201-hanging frame; 202-hanging rope; 203-shock-absorbing spring. DETAILED DESCRIPTION

[0034] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0035] Example 1

[0036] This embodiment provides a vibrating fluidized separator for lean and fine coal, see Figure 1, including an exciting machine body 101, a main air distribution member 102, a partitioning grate 104 and a re-selection air distribution member 103. The partitioning grate 104 and the re-selection air distribution member 103 are arranged on one side of the exciting machine body 101 from top to bottom. The inner cavity of the exciting machine body 101 is divided into a main selection area I without the partitioning grate 104 and the re-selection air distribution member 103 and a re-selection area with the partitioning grate 104 and the re-selection air distribution member 103. The partitioning grate 104 and the re-selection air distribution member 103 divide the re-selection area into a coarse coal separation chamber II, a The re-selection chamber III and the gangue channel IV are provided with a raw coal feed port 1011 and a gangue discharge port 106 in the main selection area I, wherein the raw coal feed port 1011 is located at the top of the main selection area I on the side away from the re-selection area, and the gangue discharge port 106 is located at the bottom of the main selection area I on the side close to the re-selection area. The roughing clean coal chamber II is provided with a roughing clean coal discharge port, and the re-selection chamber III is provided with a medium coal discharge port and a medium coal discharge port (for example, an overflow weir). Considering the density of medium coal and medium coal, the medium coal discharge port is located above the medium coal discharge port.

[0037] Specifically, one end of the partition grate 104 is rotatably connected to the side wall of the vibration body 101, and the other end is suspended. Then, one end of the air distribution member 103 is fixedly connected to the side wall of the vibration body 101, and the other end is suspended.

[0038] During implementation, raw coal enters the main selection zone I from the raw coal feed port 1011, and airflow is supplied to the main selection zone I from the main air distribution member 102; in the main selection zone I, the raw coal is subjected to the composite force field of the exciting force and the airflow, and stratification occurs in the longitudinal direction of the exciting body 101 according to the density difference, the light-density roughing coal stays in the upper part of the main selection zone I, the heavy-density gangue particles sink to the lower part of the main selection zone I, and the medium-density materials (including the mixture of medium coal and re-selected clean coal) are suspended in the middle position of the main selection zone I; as the raw coal is continuously added, the gangue particles, roughing clean coal, medium coal and re-selected clean coal in the main selection zone I are affected by the newly-introduced raw coal. The thrust and exciting force of coal cause horizontal migration; the roughing clean coal enters the roughing clean coal chamber II, and is then discharged from the roughing clean coal chamber II outlet as a clean coal product, and the gangue particles are discharged from the gangue outlet 106 and / or the gangue channel IV; the air flow is supplied to 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 two-stage sorting, and the medium coal and re-selected clean coal mixture are stratified again by the composite force field of the exciting force and the air flow, and the light-density re-selected clean coal stays in the upper part of the re-selection chamber III and is then discharged from the re-selected clean coal outlet, and the heavy-density medium coal stays in the lower part of the re-selection chamber III and is then discharged from the medium coal outlet.

[0039] Compared with the prior art, the vibrating fluidized bed separator for lean, fine and mixed coal provided in this embodiment divides the excitation body 101 into a main selection area I, a coarse selection clean coal chamber II, a reselection chamber III and a gangue channel IV by setting a separating grate plate 104 and a reselection air distribution member 103. The raw coal enters the main selection area I for a first-stage separation, which can realize the separation of gangue particles, coarse selection clean coal and a mixture of medium coal and reselected clean coal. The mixture of medium coal and reselected clean coal enters the reselection chamber III for a second-stage separation, which can realize the separation of medium coal and reselected clean coal, and simultaneously complete the full separation of gangue particles, coarse selection clean coal, reselected clean coal and medium coal. The process flow is simple, the separation cost is low, and the problems of low separation accuracy of 0.5-13 mm fine coal and serious waste of resources can be solved.

[0040] In order to ensure the processing capacity and processing efficiency of the vibration fluidized separator for lean fine coal, illustratively, the length of the vibration body 101 is 1500~2500mm (for example, 2000mm), the width is 450~550mm (for example, 500mm), and the height is 1000~1500mm (for example, 1200mm).

[0041] In order to facilitate the discharge of dust in the excitation body 101, a dust outlet 1012 is opened on the top of the excitation body 101. Exemplarily, there are multiple dust outlets 1012 (for example, two) to achieve smooth discharge of dust from the excitation body 101.

[0042] The structure of the main air distribution component 102 specifically includes a main air distribution chamber 1021 fixedly connected (for example, welded) to the excitation 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 (for example, a rigid bracket) for installing the main air distribution plate 1022, and a main air distribution hole is opened on the main air distribution plate 1022.

[0043] Taking into account that the gangue particles will move along the main air distribution plate 1022 to the gangue discharge port 106 and / or the gangue channel IV for discharge, in order to be able to adjust the discharge speed of the gangue particles, for example, the main air distribution plate 1022 is rotatably connected to the main air distribution bracket at one end close to the gangue discharge port 106, 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.

[0044] For example, the main air distribution plate 1022 has an inclination angle of 0 to 25 degrees. When the amount of waste rock particles exceeds the waste rock threshold, the main air distribution plate 1022 can be driven to rotate, increasing the inclination angle of the main air distribution plate 1022 to accelerate the migration speed of the waste rock particles and avoid bed crushing.

[0045] In order to adjust the inclination angle of the main air distribution plate 1022 by using the air flow, for the case where there is only one main air distribution chamber 1021, for 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 that is sleeved outside the first sub-tube 1025, with 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 area and a peripheral area surrounding the central area. The peripheral area has main air distribution holes, while the central area does not have main air distribution holes. The air outlet of the first sub-tube 1025 covers the central area and is connected to the edge of the central area through the first elastic ring 1023. The first sub-tube 1025 is equipped with an air pump 1027, and the air outlet of the second sub-tube 1026 covers the peripheral area and is connected to the edge of the peripheral area through the second elastic ring 1024.

[0046] When the inclination angle of the main air distribution plate 1022 does not need to be increased, only the second sub-tube 1026 supplies air to the main selection area I through the main air distribution holes. When the inclination angle of the main air distribution plate 1022 needs to be increased, the air pump 1027 is turned on, and air is simultaneously introduced into the first sub-tube 1025 and the second sub-tube 1026, causing the length of the first elastic ring 1023 and the second elastic ring 1024 to increase, causing the main air distribution plate 1022 to rotate clockwise, and the inclination angle of the main air distribution plate 1022 to increase. In this way, through the coordinated first sub-tube 1025 and the second sub-tube 1026, the pressure of the airflow can drive the main air distribution plate 1022 to rotate, thereby realizing the use of airflow to adjust the inclination angle of the main air distribution plate 1022 without the need for any additional main air distribution plate 1022 driving mechanism.

[0047] To ensure stable air distribution, illustratively, there are multiple (e.g., two) main air distribution chambers 1021, each evenly spaced. The longitudinal cross-section of each main air distribution chamber 1021 is shaped like an inverted trapezoid. Thus, by providing multiple main air distribution chambers 1021, the cross-sectional area of ​​each main air distribution chamber 1021 along the direction of airflow gradually increases, thereby buffering the airflow and effectively ensuring stable air distribution.

[0048] As for the structure of the reselected air distribution member 103, specifically, it includes a reselected air distribution plate and a reselected air distribution bracket (for example, a rigid bracket) for installing the reselected air distribution plate, and reselected air distribution holes are provided on the reselected air distribution plate.

[0049] In order to improve the uniformity of air distribution, the air distribution plate includes air distribution slots, a plate body and dividing ribs 1032, see Figure 2The dividing ribs 1032 are arranged in the air distribution slot, dividing the air distribution slot into multiple air distribution sub-slots 1031, and each air distribution sub-slot 1031 is provided with an air inlet hole 1033. The plate body covers the notch of the air distribution slot, and then the air distribution holes are opened on the plate body.

[0050] The air supply of the multiple air distribution sub-troughs 1031 is independently set, and the air supply speed can be adjusted separately according to the different thicknesses of the mixture of medium coal and re-selected clean coal at different positions, thereby further improving the sorting accuracy during the re-selection process.

[0051] Exemplarily, the dividing ribs 1032 include transverse ribs and longitudinal ribs, and the number of the transverse ribs and the number of the longitudinal ribs are both one, thereby dividing the air distribution slot into a plurality of air distribution sub-slots 1031 arranged in 2×2.

[0052] In order to minimize the occupation of the sorting space by the reselection air distribution plate, illustratively, the height of the reselection air distribution plate is 50-80 mm, and the shape of the air distribution sub-trough 1031 is a flat cube.

[0053] In order to improve the sorting accuracy and avoid the mixture of medium coal and re-selected clean coal from being blocked on the side wall of the re-selection air distribution plate, resulting in material backmixing, the above-mentioned re-selection air distribution plate is tilted toward one side of the main selection area I, thereby forming a pointed end, which is convenient for accurately sorting the gangue particles and the mixture of medium coal and re-selected clean coal.

[0054] In order to provide discharge power for the coarsely selected clean coal, the structure of the partition grate 104 specifically includes a partition plate body with drive air holes formed thereon. For example, the diameter of the drive air holes is 4-8 mm (eg, 6 mm).

[0055] In order to be able to adjust the height of the dividing material layer between the mixture of medium coal and re-cleaned coal and the rougher clean coal, the above-mentioned partition plate is rotatably connected to the side wall of the excitation body 101. Through the relative rotation of the partition plate, the size of the feed opening of the rougher clean coal chamber II and the re-cleaned coal 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-cleaned coal and the rougher clean coal.

[0056] It should be noted that if the content of rough clean coal in the raw coal exceeds the threshold range of rough clean coal, the partition plate body is rotated so that the free end of the partition plate body is lower than the connecting end, the feed port of the rough clean coal chamber II is enlarged, and the processing capacity of the rough clean coal is increased; if the content of the mixture of medium coal and re-selected clean coal in the raw coal exceeds the threshold range of the mixture, the partition plate body is rotated so that the free end of the partition plate body is higher than the connecting end, the feed port of the re-selection chamber III is enlarged, and the processing capacity of the mixture of medium coal and re-selected clean coal is increased.

[0057] It can be understood that in order to achieve the vibration of the excitation body 101, the above-mentioned vibration fluidization separator for lean fine coal also includes a hanging unit and an excitation unit. The excitation body 101 is elastically suspended on the hanging unit, and the excitation units are arranged on both sides of the excitation body 101. The output end of the excitation unit is connected to the excitation body 101, and is used to drive the excitation body 101 to vibrate in a certain direction, amplitude and frequency.

[0058] Specifically, the structure of the hanging unit includes a hanging frame 201 , a hanging rope 202 and a shock-absorbing spring 203 . The excitation body 101 is hung on the hanging frame 201 via the shock-absorbing spring 203 and the hanging rope 202 in sequence.

[0059] In order to be able to adjust the discharge capacity of gangue particles according to the amount of gangue particles, the above-mentioned vibrating fluidized separator for lean fine coal also includes a gangue discharge gate 105, and the main air distribution member 102 (specifically the main air distribution plate 1022) has a gap with the lower wall of the gangue channel IV, and the gap serves as the gangue discharge port 106. One end of the gangue discharge gate 105 is rotatably connected to one side of the gangue channel IV close to the gap, and the other end is a free end.

[0060] Specifically, the gangue discharge gate 105 has a discharge mode, a channel mode and a composite mode.

[0061] If the amount of gangue particles is lower than the first threshold value, the amount of gangue particles is small, the gangue discharge gate 105 is in the discharge mode, the free end of the gangue discharge gate 105 contacts the upper wall of the gangue channel IV, the main selection area I is disconnected from the gangue channel IV, the gangue discharge port 106 is connected to the main selection area I, and the gangue particles are discharged from the gangue discharge port 106; if the amount of gangue particles is between the first threshold value and the second threshold value, the amount of gangue particles is in the middle amount, the gangue discharge gate 105 is in the channel mode, the gangue discharge gate 105 is in the channel mode, and the gangue discharge gate 105 is in the channel mode. The free end of 05 contacts the main air distribution component 102, the gangue discharge port 106 is disconnected from the main selection area I, the main selection area I is connected to the gangue channel IV, and the gangue particles are discharged from the gangue channel IV; if the amount of gangue particles is higher than the second threshold value and the amount of gangue particles is large, the gangue discharge gate 105 is in the composite mode, and the free end of the gangue discharge gate 105 is suspended in the air, the gangue discharge port 106 and the gangue channel IV are both connected to the main selection area I, and the gangue particles are discharged from the gangue discharge port 106 and the gangue channel IV at the same time.

[0062] Example 2

[0063] This embodiment provides a vibration fluidization separation method for lean and fine coal, using the vibration fluidization separation machine for lean and fine coal provided in Example 1. The vibration fluidization separation method includes the following steps:

[0064] Step 1: Raw coal enters the main selection zone I from the raw coal feed port 1011, and air is supplied into the main selection zone I from the main air distribution member 102;

[0065] Step 2: In the main selection zone I, the raw coal is subjected to the combined force field of the excitation force and the airflow, and stratification occurs in the longitudinal direction of the excitation body 101 according to density differences. The light-density rougher clean coal stays in the upper part of the main selection zone I, the denser gangue particles sink to the lower part of the main selection zone I, and the intermediate-density material (including the mixture of medium coal and re-selected clean coal) is suspended in the middle of the main selection zone I.

[0066] Step 3: As raw coal is continuously added, the gangue particles, rougher clean coal, medium coal and re-clean coal in the main selection area I are pushed and vibrated by the new raw coal and migrate horizontally;

[0067] Step 4: The rougher clean coal enters the rougher clean coal chamber II and is then discharged from the discharge port of the rougher clean coal chamber II as a clean coal product, and the gangue particles are discharged from the gangue discharge port 106 and / or the gangue channel IV;

[0068] Step 5: Air is supplied from the re-selection air distribution member 103 into the re-selection chamber III. The medium coal and re-selected clean coal enter the re-selection chamber III for secondary separation. The mixed medium coal and re-selected clean coal are separated again by the combined force field of the excitation force and the airflow. The light-density re-selected clean coal stays in the upper part of the re-selection chamber III and is then discharged from the re-selected clean coal outlet.

[0069] The dense medium coal stays in the lower part of the re-selection chamber III and is then discharged from the medium coal outlet.

[0070] Compared with the prior art, the beneficial effects of the vibration fluidization separation method for lean and fine coal provided in this embodiment are basically the same as the beneficial effects of the vibration fluidization separation machine for lean and fine coal provided in Example 1, and are not described in detail here.

[0071] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. A vibrating fluidized separator for lean and fine coal, characterized in that: The vibrating machine comprises an exciting body, a main air distribution member, a partitioning grate plate and a reselection air distribution member, wherein the partitioning grate plate and the reselection air distribution member are arranged on one side of the exciting body from top to bottom; the inner cavity of the vibrating body is divided into a main selection area without the partitioning grate plate and the reselection air distribution member, and a reselection area with the partitioning grate plate and the reselection air distribution member; the partitioning grate plate and the reselection air distribution member divide the reselection area into a coarse clean coal chamber, a reselection 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 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 reselected clean coal discharge port; One end of the partition grate is connected to the side wall of the excitation body, and the other end is suspended; one end of the reselection air distribution member is connected to the side wall of the excitation body, and the other end is suspended; one end of the partition grate is rotatably connected to the side wall of the excitation body; one end of the reselection air distribution member is fixedly connected to the side wall of the excitation body; The vibrating fluidized separator for lean, fine, and mixed coal further comprises a gangue discharge gate, wherein a gap is provided between the main air distribution member and the lower wall of the gangue channel, and the gap serves as a gangue discharge port. One end of the gangue discharge gate is rotatably connected to the side of the gangue channel close to the gap, and the other end is a free end. The gangue discharge gate has a discharge mode, a channel mode, and a composite mode. If the amount of gangue particles is lower than a first threshold value, the gangue discharge gate is in the discharge mode, and the free end of the gangue discharge gate contacts the upper wall of the gangue channel, and the main selection area is disconnected from the gangue channel. , the gangue discharge port is connected with the main selection area; if the amount of gangue particles is between the first threshold value and the second threshold value, the gangue discharge gate is in the channel mode, then the free end of the gangue discharge gate contacts the main air distribution component, the gangue discharge port is disconnected from the main selection area, and the main selection area is connected with the gangue channel; if the amount of gangue particles is higher than the second threshold value, the gangue discharge gate is in the composite mode, then the free end of the gangue discharge gate is suspended, the gangue discharge port and the gangue channel are both connected with the main selection area, and the gangue particles are discharged from the gangue discharge port and the gangue channel at the same time.

2. The vibration fluidized separator for lean and fine coal according to claim 1, characterized in that: The main air distribution member includes a main air distribution chamber fixedly connected to the excitation body, 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 arranged outside the first sub-tube. The main air distribution plate is divided into a central area and a surrounding area surrounding the central area. The surrounding area is provided with a main air distribution hole, and the central area is not provided with a main air distribution hole. 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 suction 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 suction 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 length of the first elastic ring and the second elastic ring increases, and the inclination angle of the main air distribution plate increases.

3. The vibration fluidized separator for lean and fine coal according to claim 1, characterized in that: The reselected air distribution member includes a reselected air distribution plate; The reselection air distribution plate includes an air distribution slot, a plate body and a dividing rib. The dividing rib is 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 slot of the air distribution slot, and the reselection air distribution hole is provided on the plate body.

4. The vibration 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 vibration fluidized separator for lean and fine coal according to claim 1, characterized in that: The raw coal feeding 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 the side of the reselection area.

6. The vibration fluidized separator for lean fine coal according to any one of claims 1 to 5, characterized in that: It also includes a hanging unit and an excitation unit. The excitation body is elastically suspended on the hanging unit, and the output end of the excitation unit is connected to the excitation body.

7. The vibration fluidized separator for lean fine coal according to claim 6, characterized in that: The hanging unit comprises a hanging frame, a hanging rope and a shock-absorbing spring, and the vibration exciting body is hung on the hanging frame through the shock-absorbing spring and the hanging rope in sequence.

8. A vibration fluidization separation method for lean and fine coal, characterized in that: The vibration fluidized separation machine for fine coal according to any one of claims 1 to 7 is used, and the vibration fluidized separation method comprises the following steps: Step 1: Raw coal enters the main selection zone from the raw coal feed port, and airflow is supplied into the main selection zone from the main air distribution component; Step 2: In the main selection area, the raw coal is stratified in the longitudinal direction of the vibration machine. The rougher 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 rougher clean coal enters the rougher clean coal chamber, and the gangue particles are discharged from the gangue discharge port and / or the gangue channel; Step 5: Air is supplied from the re-selection air distribution member into the re-selection chamber, and the mixture of the middling coal and the re-selected clean coal enters the re-selection chamber for secondary separation. The mixture of the middling coal and the re-selected clean coal is stratified 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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