Slag coal separation system and regulation and control method thereof

Abstract

The invention discloses a slack coal sorting system and a regulation and control method thereof, belongs to the technical field of sorting regulation and control, and aims to solve the problems of long regulation and control time consumption and poor manual judgment accuracy of a vibration fluidization sorting machine in the prior art. According to the method, the actually-measured bed density, the rated handling capacity and the actually-measured raw coal and clean coal ash difference value of a main separation area in the slack coal separation system are calculated; judging whether the actually-measured bed density, the rated handling capacity and the actually-measured raw coal clean coal ash difference value are normal or not; if not, the actually-measured bed density, the rated handling capacity and the actually-measured difference value of the clean coal ash content of the raw coal return to be normal by adjusting the magnetite powder medium content, the pulverized coal medium content, the binary heavy medium total amount, the airflow speed and the uniform stability of the bed density and / or prolonging the separation time. The method can be used for regulating and controlling the slack coal separation system.

Description

Technical Field

[0001] The present invention belongs to the technical field of sorting control, and particularly relates to a fine coal sorting system and a control method thereof. Background Art

[0002] The vibrating fluidized bed separator is a highly efficient and clean dry coal separation equipment with high sorting accuracy and a low lower limit of effective sorting particle size. It uses air and heavy medium as the sorting medium, supplemented by vibration energy, so that coal gangue particles are quickly loosened in the bed body and stratified longitudinally according to density differences.

[0003] The regulation of traditional vibrating fluidized bed separators has limitations. It mainly relies on manual experience judgment, lacks a complete and accurate reference standard, takes a long time to regulate, has poor accuracy, and cannot accurately and timely guide the regulation of production parameters. Summary of the Invention

[0004] In view of the above analysis, the present invention aims to provide a fine coal sorting system and a control method thereof to solve the problems of long regulation time and poor accuracy of manual judgment in the existing vibrating fluidized bed separator.

[0005] The object of the present invention is mainly achieved through the following technical solutions.

[0006] The present invention provides a control method for a fine coal sorting system, including the following steps:

[0007] Step 1: Calculate the difference between the measured bed density, the rated throughput, and the measured raw coal clean coal ash content in the main selection area of the fine coal sorting system respectively;

[0008] Step 2: Judge whether the difference between the measured bed density, the rated throughput, and the measured raw coal clean coal ash content is normal;

[0009] If not, adjust the magnetite powder medium content, coal powder medium content, total amount of binary heavy medium, air flow velocity, bed density uniformity and stability, and / or increase the sorting time to make the difference between the measured bed density, the rated throughput, and the measured raw coal clean coal ash content return to normal.

[0010] Further, step 2 specifically includes the following steps:

[0011] Judge whether more than 60% of the measured bed densities are within the rated bed density range among multiple measured bed densities;

[0012] If so, it means that the measured bed density is normal;

[0013] If not, then determine whether the percentage of the measured bed density higher than the rated bed density range among the measured bed densities outside the rated bed density range exceeds 50%; if so, it indicates that the measured bed density is too large, and reduce the content of magnetite powder medium, increase the content of pulverized coal medium and / or increase the air flow velocity to reduce the measured bed density; if not, it indicates that the measured bed density is too small, and increase the content of magnetite powder medium, reduce the content of pulverized coal medium and / or reduce the air flow velocity to increase the measured bed density;

[0014] Determine whether the raw coal feed rate per unit time is within the rated processing capacity range;

[0015] If so, it indicates that the raw coal feed rate per unit time is normal;

[0016] If not, then determine whether the raw coal feed rate per unit time is greater than the rated processing capacity range; if so, it indicates that the rated processing capacity is too small, and increase the total amount of binary heavy medium and / or increase the air flow velocity to increase the rated processing capacity; if not, it indicates that the rated processing capacity is too large, and reduce the total amount of binary heavy medium and / or reduce the air flow velocity to reduce the rated processing capacity;

[0017] Determine whether the difference in ash content of the measured raw coal clean coal is above the rated ash content difference; if so, it indicates that the separation effect meets the standard; if not, it indicates that the separation effect does not meet the standard, and increase the uniform stability of the bed density and / or increase the separation time to increase the difference in ash content of the measured raw coal clean coal.

[0018] Furthermore, the fine coal separation system for slack coal includes a buffer bin, a magnetite powder medium bin, a pulverized coal medium bin, a main air supply unit, a main separation area and a rough separation clean coal chamber. The discharge ports of the buffer bin, the magnetite powder medium bin and the pulverized coal medium bin are connected to the main separation area through the raw coal feed port. The air outlet of the main air supply unit is communicated with the bottom of the main separation area. The clean coal outlet of the main separation area is communicated with the clean coal inlet of the rough separation clean coal chamber. The rough separation clean coal chamber is provided with a rough separation clean coal discharge port.

[0019] Furthermore, in step 2, change the air supply velocity to reduce the fluidization number of the bed air flow and increase the uniform stability of the bed density.

[0020] Furthermore, in step 2, adjust the vibration intensity of the bed body to increase the uniform stability of the bed density.

[0021] Furthermore, in step 2, reduce the lateral inclination angle and the longitudinal inclination angle of the fine coal separation system for slack coal, and reduce the lateral migration speed of the raw coal to increase the separation time.

[0022] Furthermore, the calculation method of the measured bed density includes the following steps:

[0023] Step a1: Along the vertical direction, a plurality of sidewall pressure sensors are arranged on the sidewalls of the main selection area;

[0024] Step a2: Obtain the measured pressure values of two adjacent sidewall pressure sensors;

[0025] Step a3: Calculate the measured pressure drop value between two adjacent sidewall pressure sensors;

[0026] Step a4: Calculate the measured bed density according to the measured pressure drop value and the vertical distance between two adjacent sidewall pressure sensors.

[0027] Furthermore, the calculation method of the throughput per unit time includes the following steps:

[0028] Step b1: An inlet pressure sensor and an inlet speed sensor are arranged at the raw coal conveyor belt;

[0029] Step b2: Obtain the measured inlet pressure and the measured inlet speed;

[0030] Step b3: Calculate the measured raw coal feed amount per unit time according to the measured inlet pressure and the measured inlet speed.

[0031] Furthermore, the calculation method of the difference in ash content of the measured raw coal concentrate includes the following steps:

[0032] Step c1: Ash content measuring instruments are arranged at the raw coal inlet and the outlet of the rough concentrate;

[0033] Step c2: Obtain the measured raw coal ash content and the measured rough concentrate ash content;

[0034] Step c3: Calculate the difference between the measured raw coal ash content and the measured rough concentrate ash content, which is the difference in ash content of the measured raw coal concentrate.

[0035] The present invention also provides a fine coal separation system, which is regulated by using the regulation method of the above fine coal separation system.

[0036] Compared with the prior art, the present invention can at least achieve the following beneficial effects:

[0037] The control method of the fine coal separation system provided by the present invention comprehensively considers multiple influencing parameters of the fine coal separation system (measured bed density, rated processing capacity, and difference between measured raw coal clean coal ash) during the vibrated fluidized bed separation process of fine coal. By calculating accurate data of the measured bed density, rated processing capacity, and difference between measured raw coal clean coal ash, and comparing them with the rated parameters, for different abnormal situations, by adjusting multiple process parameters, the measured bed density, rated processing capacity, and difference between measured raw coal clean coal ash can be quickly and accurately adjusted to the rated data, realizing timely feedback control. Thus, according to the change of raw coal quality and product requirements, the measured bed density, rated processing capacity, and difference between measured raw coal clean coal ash can be flexibly adjusted, realizing the effective, comprehensive, and green utilization of fine coal resources.

[0038] 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 achieved and obtained through the examples of the description and the content specifically pointed out in the drawings. Description of the Drawings

[0039] The drawings are only for the purpose of showing specific embodiments and are not considered to be a limitation of the present invention. Throughout the drawings, the same reference signs denote the same components.

[0040] Figure 1 It is a flowchart of the control method of the fine coal separation system provided in Embodiment 1 of the present invention;

[0041] Figure 2 It is a schematic structural diagram of the fine coal separation system provided in Embodiment 2 of the present invention;

[0042] Figure 3 It is a schematic structural diagram of the main air supply chamber in the fine coal separation system provided in Embodiment 2 of the present invention.

[0043] Reference Signs:

[0044] 101 - vibrating bin; 1011 - raw coal feed inlet; 102 - main air supply unit; 1021 - main air supply chamber; 1022 - main air supply plate; 1023 - first elastic ring; 1024 - second elastic ring; 1025 - inner pipe; 1026 - outer pipe; 1027 - suction unit; 103 - auxiliary air supply unit; 104 - rough selection and re - selection separation plate; 105 - baffle; 106 - gangue discharge outlet. Detailed Embodiments

[0045] The preferred embodiments of the present invention will be specifically described below with reference to the accompanying drawings. The accompanying drawings form a part of the present invention and are used together with the embodiments of the present invention to explain the principles of the present invention, rather than to limit the scope of the present invention.

[0046] Embodiment 1

[0047] This embodiment provides a regulation method for a fine coal separation system. Refer to Figure 1 , in which the fine coal separation system includes a buffer bin, a magnetite powder medium bin, a pulverized coal medium bin, a main air supply unit 102, a main separation area, and a rough separation clean coal chamber. The discharge ports of the buffer bin, the magnetite powder medium bin, and the pulverized coal medium bin are connected to the main separation area through a raw coal feed port 1011. The air outlet of the main air supply unit 102 is communicated with the bottom of the main separation area. The clean coal outlet of the main separation area is communicated with the clean coal inlet of the rough separation clean coal chamber. The rough separation clean coal chamber is provided with a rough separation clean coal discharge port.

[0048] Correspondingly, the above regulation method includes the following steps:

[0049] Step 1: Calculate the difference between the measured bed density, the rated throughput, and the measured ash content of raw coal clean coal in the main separation area of the fine coal separation system respectively;

[0050] Step 2: Judge whether more than 60% of the measured bed densities among multiple measured bed densities are within the rated bed density range. The rated bed density range is the rated bed density ± 300 kg / m 3 ;

[0051] If so, it means that the measured bed density is normal;

[0052] If not, judge whether the percentage of the measured bed density higher than the rated bed density range among the measured bed densities outside the rated bed density range exceeds 50% of all the measured bed densities outside the rated bed density range. If so, it means that the measured bed density is too large. Reduce the magnetite powder medium content, increase the pulverized coal medium content, and / or increase the air flow velocity (at the position of the main air supply unit 102) to reduce the measured bed density. If not, it means that the measured bed density is too small. Increase the magnetite powder medium content, reduce the pulverized coal medium content, and / or reduce the air flow velocity (at the position of the main air supply unit 102) to increase the measured bed density;

[0053] Judge whether the raw coal feed amount per unit time is within the rated throughput range;

[0054] If so, it means that the raw coal feed amount per unit time is normal;

[0055] If not, determine whether the raw coal feed rate per unit time is greater than the rated processing capacity range; if so, it indicates that the rated processing capacity is too small, and increase the total amount of binary heavy medium and / or increase the air flow velocity (at the position of the main air supply unit 102) to increase the rated processing capacity; if not, it indicates that the rated processing capacity is too large, and decrease the total amount of binary heavy medium and / or decrease the air flow velocity (at the position of the main air supply unit 102) to decrease the rated processing capacity;

[0056] Determine whether the measured difference in ash content of raw coal clean coal is above the rated ash content difference; if so, it indicates that the separation effect meets the standard (the rated ash content difference is selected according to factors such as the quality of raw coal and the requirements of separated products); if not, it indicates that the separation effect does not meet the standard, and increase the uniformity and stability of the bed density and / or increase the separation time to increase the measured difference in ash content of raw coal clean coal.

[0057] Compared with the prior art, the control method of the fine coal separation system provided in this embodiment comprehensively considers multiple influencing parameters of the fine coal separation system (measured bed density, rated processing capacity, and measured difference in ash content of raw coal clean coal) during the vibrated fluidized bed separation process of fine coal. By calculating accurate data of the measured bed density, rated processing capacity, and measured difference in ash content of raw coal clean coal, and comparing them with the rated parameters, for different abnormal situations, by adjusting multiple process parameters, the measured bed density, rated processing capacity, and measured difference in ash content of raw coal clean coal can be quickly and accurately adjusted to the rated data, realizing timely feedback control. Thus, it can flexibly adjust the measured bed density, rated processing capacity, and measured difference in ash content of raw coal clean coal according to the change of raw coal quality and product requirements, and realize the effective, comprehensive, and green utilization of fine coal resources.

[0058] It should be noted that the following two methods are adopted to increase the uniformity and stability of the bed density:

[0059] Change the air supply wind speed (at the position of the main air supply unit 102) to reduce the fluidization number of the bed air flow and increase the uniformity and stability of the bed density.

[0060] And / or, adjust the vibration intensity of the bed body to increase the uniformity and stability of the bed density.

[0061] Correspondingly, the following method is adopted to increase the separation time:

[0062] Adjust the rope length of the hanging rope to reduce the lateral inclination and longitudinal inclination of the fine coal separation system, and reduce the lateral migration speed of raw coal to increase the separation time.

[0063] Exemplarily, the calculation method of the measured bed density includes the following steps:

[0064] Step a1: Along the vertical direction, set a plurality of side wall pressure sensors on the side walls of the main separation area;

[0065] It should be noted that multiple sidewall pressure sensors are evenly arranged in the vertical direction, and the vertical distance between two adjacent sidewall pressure sensors is 8 cm to 12 cm;

[0066] Step a2: Obtain the measured pressure values of two adjacent sidewall pressure sensors;

[0067] Step a3: Calculate the measured pressure drop value of two adjacent sidewall pressure sensors;

[0068] Step a4: Calculate the measured bed density according to the measured pressure drop value and the vertical distance between two adjacent sidewall pressure sensors. The calculation formula for the measured bed density is as follows:

[0069]

[0070] In the formula:

[0071] ρ b is the measured bed density, kg / m 3 ;

[0072] g is the acceleration due to gravity, m / s 2 ;

[0073] △p is the measured bed pressure drop value, pa;

[0074] H is the vertical distance between two adjacent sidewall pressure sensors, m.

[0075] The calculation method of the throughput per unit time includes the following steps:

[0076] Step b1: Set a feed pressure sensor and a feed speed sensor at the raw coal conveyor belt;

[0077] Step b2: Obtain the measured feed pressure (i.e., feed weight) and the measured feed speed;

[0078] Step b3: Calculate the measured raw coal feed amount per unit time according to the measured feed pressure and the measured feed speed. The calculation formula for the measured raw coal feed amount per unit time is as follows:

[0079]

[0080] In the formula:

[0081] m is the measured raw coal feed amount per unit time, kg;

[0082] F is the measured feed pressure, N;

[0083] v is the measured feed speed, m / s;

[0084] t is the unit time, s.

[0085] Exemplarily, the calculation method of the measured raw coal clean coal ash difference includes the following steps:

[0086] Step c1: Set ash measuring instruments at the raw coal feed inlet and the rough concentrate coal discharge outlet;

[0087] Step c2: Obtain the measured raw coal ash and the measured rough concentrate coal ash;

[0088] Step c3: Calculate the difference between the measured raw coal ash and the measured rough concentrate coal ash, which is the measured raw coal clean coal ash difference.

[0089] Embodiment 2

[0090] This embodiment provides a fine coal separation system, which is regulated by using the regulation method of the fine coal separation system provided in Embodiment 1.

[0091] For its specific structure, see Figure 2 , on the basis of Embodiment 1, the above-mentioned fine coal separation system further includes a vibrating bin 101, a roughing and re-selection dividing plate 104 and an auxiliary air supply unit 103.

[0092] Among them, the roughing and re-selection dividing plate 104 and the auxiliary air supply unit 103 are arranged on one side inside the vibrating bin 101 from top to bottom. The inner cavity of the vibrating bin 101 is divided into a main selection area without the roughing and re-selection dividing plate 104 and a cloth air plate, and a re-selection area with the roughing and re-selection dividing plate 104 and the auxiliary air supply unit 103. The roughing and re-selection dividing plate 104 and the auxiliary air supply unit 103 divide the re-selection area into a rough concentrate 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 inlet 1011 and a gangue discharge outlet 106. Among them, the raw coal feed inlet 1011 is located on the top of the main selection area, far from the re-selection area, and the gangue discharge outlet 106 is located at the bottom of the main selection area, close to the re-selection area. The gangue discharge outlet 106 of the main selection area is connected to the gangue channel, and the re-selection chamber is provided with a middling coal discharge outlet and a re-selection concentrate coal discharge outlet.

[0093] In this way, raw coal enters the main separation area from the raw coal inlet 1011, and air flow is supplied into the main separation area from the main air supply unit 102; within the main separation area, the raw coal is under the action of a combined force field of vibration force and air flow, and stratification occurs longitudinally in the vibration bin 101 according to density differences. The raw coal with low density and rough-selected clean coal stays in the upper part of the main separation area, the gangue particles with high density sink to the lower part of the main separation area, and the materials with medium density (including the mixture of middlings and re-selected clean coal) are suspended in the middle position of the main separation area; with the continuous addition of raw coal, the gangue particles, rough-selected clean coal, middlings, and re-selected clean coal in the main separation area are under the action of the thrust and vibration force of the newly added raw coal and migrate horizontally; the rough-selected clean coal enters the rough-selected clean coal chamber and is then discharged as clean coal product from the outlet of the rough-selected clean coal chamber, and the gangue particles are discharged from the gangue outlet 106 and / or the gangue channel; air flow is supplied into the re-separation chamber from the auxiliary air supply unit 103, and the middlings and re-selected clean coal enter the re-separation chamber for secondary separation. The mixture of middlings 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-separation chamber and is then discharged from the re-selected clean coal outlet, and the middlings with high density stay in the lower part of the re-separation chamber and are then discharged from the middlings outlet. Through the setting of the rough separation and re-separation partition 104 and the auxiliary air supply unit 103, the raw coal enters the main separation area for primary separation, and the mixture of middlings and re-selected clean coal enters the re-separation chamber for secondary separation, which can realize the separation of middlings and re-selected clean coal, and at the same time complete the full separation of gangue particles, rough-selected clean coal, re-selected clean coal, and middlings. The process flow is simple and the separation cost is low.

[0094] Specifically, for the structure of the main air supply unit 102, it includes a main air supply chamber 1021 fixedly connected (such as welded) to the vibration bin 101, a main air supply plate 1022 covering the air outlet of the main air supply chamber 1021, and a main air distribution support (such as a rigid support) for installing the main air supply plate 1022. The main air supply plate 1022 is provided with main air distribution holes.

[0095] Specifically, for the structure of the main air supply chamber 1021, refer to Figure 3, the main air supply chamber 1021 includes a first elastic ring 1023, a second elastic ring 1024, an inner pipe 1025, and an outer pipe 1026 sleeved outside the inner pipe 1025. There is a gap between the outer pipe 1026 and the inner pipe 1025. The main air supply plate 1022 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 inner pipe 1025 covers the central area and is connected to the edge of the central area through the first elastic ring 1023. A suction unit 1027 is provided on the inner pipe 1025. The air outlet of the outer pipe 1026 covers the peripheral area and is connected to the edge of the peripheral area through the second elastic ring 1024. When it is not necessary to increase the inclination angle of the main air supply plate 1022, only the outer pipe 1026 supplies air to the main selection area through the main air distribution holes; when it is necessary to increase the inclination angle of the main air supply plate 1022, the suction unit 1027 is turned on, and at the same time, air flows are introduced into the inner pipe 1025 and the outer pipe 1026, so that the lengths of the first elastic ring 1023 and the second elastic ring 1024 increase, the main air supply plate 1022 rotates clockwise, and the inclination angle of the main air supply plate 1022 increases. In this way, through the mutually cooperating inner pipe 1025 and outer pipe 1026, the pressure of the air flow can be used to drive the rotation of the main air supply plate 1022, so as to realize the adjustment of the inclination angle of the main air supply plate 1022 by using the air flow, without the need to be equipped with other additional driving mechanisms for the main air supply plate 1022.

[0096] Regarding the structure of the auxiliary air supply unit 103, specifically, it includes a re-selection air distribution plate. The re-selection air distribution plate includes an air distribution groove, a plate body, and a partition rib. The partition rib is arranged in the air distribution groove and divides 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.

[0097] It can be understood that in order to be able to realize the vibration of the vibrating bin 101, the above-mentioned raw coal separation system further includes a hanging frame, hanging ropes, and shock-absorbing springs. The vibrating bin 101 is sequentially suspended on the hanging frame through the shock-absorbing springs and the hanging ropes.

[0098] In order to be able to adjust the discharge capacity of the gangue particles according to the amount of gangue particles, the above-mentioned raw coal separation system further includes a baffle 105. There is a gap between the main air supply unit 102 (specifically referring to the main air supply plate 1022) and the lower wall surface of the gangue passage. This gap serves as the gangue discharge port 106. One end of the baffle 105 is rotatably connected to the side of the gangue passage close to the gap, and the other end is a free end.

[0099] If the amount of gangue particles is lower than the first threshold and the amount of gangue particles is small, the gangue gate is in the discharging mode. Then, the free end of the gangue gate contacts the upper wall surface of the gangue channel, the main selection area is disconnected from the gangue channel, the gangue discharge port 106 is communicated with the main selection area, and the gangue particles are discharged from the gangue discharge port 106. If the amount of gangue particles is between the first threshold and the second threshold and the amount of gangue particles is at an intermediate level, the gangue gate is in the channel mode. Then, the free end of the gangue gate contacts the main air supply unit 102, the gangue discharge port 106 is disconnected from the main selection area, the main selection area is communicated with the gangue channel, and the gangue particles are discharged from the gangue channel. If the amount of gangue particles is higher than the second threshold and the amount of gangue particles is large, the gangue gate is in the composite mode. Then, the free end of the gangue gate is suspended, both the gangue discharge port 106 and the gangue channel are communicated with the main selection area, and the gangue particles are discharged from both the gangue discharge port 106 and the gangue channel simultaneously.

[0100] As mentioned above, it is only the preferred specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention.

Claims

1. A control method for a fine coal separation system, characterized in that, The control method includes the following steps: Step 1: Calculate the difference between the measured bed density, the rated throughput, and the measured ash content of raw coal clean coal in the main separation area of the fine coal separation system respectively; Step 2: Determine whether the difference between the measured bed density, the rated throughput, and the measured ash content of raw coal clean coal is normal; If not, adjust the content of magnetite powder medium, the content of coal powder medium, the total amount of binary heavy medium, the air flow velocity, the uniformity and stability of the bed density, and / or increase the separation time to make the difference between the measured bed density, the rated throughput, and the measured ash content of raw coal clean coal return to normal.

2. The regulation method of the fine coal separation system according to claim 1, characterized in that The specific steps of Step 2 include the following steps: Determine whether more than 60% of the measured bed densities among multiple measured bed densities are within the rated bed density range; If so, it means that the measured bed density is normal; If not, determine whether the percentage of the measured bed density higher than the rated bed density range among the measured bed densities outside the rated bed density range exceeds 50% of all the measured bed densities outside the rated bed density range; if so, it means that the measured bed density is too large, reduce the content of magnetite powder medium, increase the content of coal powder medium, and / or increase the air flow velocity to reduce the measured bed density; if not, it means that the measured bed density is too small, increase the content of magnetite powder medium, reduce the content of coal powder medium, and / or reduce the air flow velocity to increase the measured bed density; Determine whether the raw coal feed rate per unit time is within the rated throughput range; If so, it means that the raw coal feed rate per unit time is normal; If not, determine whether the raw coal feed rate per unit time is greater than the rated throughput range; if so, it means that the rated throughput is too small, increase the total amount of binary heavy medium and / or increase the air flow velocity to increase the rated throughput; if not, it means that the rated throughput is too large, reduce the total amount of binary heavy medium and / or reduce the air flow velocity to reduce the rated throughput; Determine whether the difference between the measured ash content of raw coal clean coal is above the rated ash difference; if so, it means that the separation effect meets the standard; if not, it means that the separation effect does not meet the standard, increase the uniformity and stability of the bed density and / or increase the separation time to increase the difference between the measured ash content of raw coal clean coal.

3. The regulation method of the fine coal separation system according to claim 2, characterized in that The fine coal separation system includes a buffer bin, a magnetite powder medium bin, a coal powder medium bin, a main air supply unit, a main separation area, and a rough separation clean coal chamber. The discharge ports of the buffer bin, the magnetite powder medium bin, and the coal powder medium bin are connected to the main separation area through the raw coal feed port. The air outlet of the main air supply unit is communicated with the bottom of the main separation area. The clean coal outlet of the main separation area is communicated with the clean coal inlet of the rough separation clean coal chamber, and the rough separation clean coal chamber is provided with a rough separation clean coal discharge port.

4. The regulation method of the fine coal separation system according to claim 3, characterized in that, In Step 2, change the air supply velocity to reduce the fluidization number of the bed air flow and increase the uniformity and stability of the bed density.

5. The regulation method of the fine coal separation system according to claim 3, characterized in that, In Step 2, adjust the vibration intensity of the bed body to increase the uniformity and stability of the bed density.

6. The regulation method of the fine coal separation system according to claim 3, characterized in that, In Step 2, reduce the lateral inclination angle and the longitudinal inclination angle of the fine coal separation system and reduce the lateral migration speed of the raw coal to increase the separation time.

7. The control method of the fine coal separation system according to claim 3, wherein The calculation method of the measured bed density includes the following steps: Step a1: Along the vertical direction, set a plurality of side wall pressure sensors on the side wall of the main separation area; Step a2: Obtain the measured pressure values of two adjacent sidewall pressure sensors; Step a3: Calculate the measured pressure drop values of two adjacent sidewall pressure sensors; Step a4: Calculate the measured bed density based on the measured pressure drop values and the vertical spacing between two adjacent sidewall pressure sensors.

8. The regulation method of the fine coal separation system according to claim 3, characterized in that, The calculation method of the throughput per unit time includes the following steps: Step b1: Set a feed pressure sensor and a feed speed sensor at the raw coal conveyor belt; Step b2: Obtain the measured feed pressure and the measured feed speed; Step b3: Calculate the measured raw coal feed amount per unit time based on the measured feed pressure and the measured feed speed.

9. The control method of the fine coal separation system according to claim 3, characterized in that, The calculation method of the difference in ash content of the measured raw coal concentrate includes the following steps: Step c1: Set ash content measuring instruments at the raw coal feed inlet and the rough concentrate discharge outlet; Step c2: Obtain the measured raw coal ash content and the measured rough concentrate ash content; Step c3: Calculate the difference between the measured raw coal ash content and the measured rough concentrate ash content, which is the difference in ash content of the measured raw coal concentrate.

10. A fine coal separation system, characterized in that, Perform regulation by using the regulation method of the fine coal separation system according to any one of claims 1 to 9.

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