Dynamic separator of coal mill

Abstract

The utility model provides a coal mill dynamic separator which comprises a shell and a sampling assembly, a coal milling assembly is arranged at the bottom in the shell, a separation assembly is arranged at the top in the shell, the sampling assembly is connected with a light phase outlet of the separation assembly, and a coal falling pipe is further arranged in the shell. The sampling assembly comprises a sampling pipe, a sampling valve, a sample collector, a screen and a receiving tank, one end of the sampling pipe is connected with the light phase outlet of the separation assembly, the other end of the sampling pipe is connected with the inlet of the sample collector, the sampling valve is arranged on the sampling pipe, and the screen is arranged between the bottom outlet of the sample collector and the inlet of the receiving tank; and a bottom outlet of the sample collector is provided with a sample outlet valve above the screen. A first weighing device is arranged at the bottom of the sample collector, and a second weighing device is arranged at the bottom of the receiving tank. Real-time online adjustment of the fineness of the coal powder separated by the dynamic separator of the coal mill is realized, and the separation efficiency of the dynamic separator is improved.

Description

Technical Field

[0001] The present application relates to the technical field of coal powder separation, and in particular to a coal mill dynamic separator. Background Art

[0002] When a coal-fired power plant generates electricity, it needs to burn coal as fuel to generate heat, which is then used in the power generation device. When the coal-fired unit is in operation, in order to improve the operating flexibility of the thermal power unit and reduce the waste of coal, the coal-fired unit needs to have the ability to start and stop quickly and to adjust the peak value, so that the unit can operate stably under a wide load condition.

[0003] For boiler systems involved in deep peak-shaving operation, the adjustment of coal powder fineness is also an effective way to optimize combustion. The finer the coal powder fineness, the better its ignition and combustion characteristics. Under deep peak-shaving operation conditions, using coal powder of appropriate fineness and improving the ignition and combustion characteristics of coal powder are of great significance for stable combustion. Usually, the ground coal powder is separated by a static separator or a dynamic separator. However, the static separator does not have the ability to quickly adjust the fineness of the coal powder in real time, while the dynamic separator uses aerodynamics and centrifugal force to separate the fine coal powder from the coarse coal particles, and can adjust the frequency converter of the dynamic separator to adjust the fineness of the coal powder.

[0004] However, in actual operation, although the dynamic separator can adjust the fineness of the coal powder, since there is no real-time monitoring of the coal powder particle size, the operating personnel are unable to monitor the coal powder particle size in time, resulting in the coal powder entering the furnace being too high or too low in fineness, affecting the boiler efficiency. Utility Model Content

[0005] The present application provides a coal mill dynamic separator to solve the above-mentioned problems mentioned in the background technology.

[0006] The present application provides a coal mill dynamic separator, comprising: a shell and a sampling assembly, a coal mill assembly is arranged at the bottom of the shell, a separation assembly is arranged at the top of the shell, the sampling assembly is connected to the light phase outlet of the separation assembly, and a coal drop pipe is also arranged in the shell.

[0007] The sampling assembly includes a sampling tube, a sampling valve, a sample collector, a screen and a receiving tank. One end of the sampling tube is connected to the light phase outlet of the separation assembly, and the other end of the sampling tube is connected to the inlet of the sample collector. The sampling valve is arranged on the sampling tube, a screen is arranged between the bottom outlet of the sample collector and the inlet of the receiving tank, and a sample outlet valve is arranged above the screen at the bottom outlet of the sample collector.

[0008] A first weighing device is arranged at the bottom of the sample collector, and a second weighing device is arranged at the bottom of the receiving tank.

[0009] Optionally, a vibration motor is provided on the side wall of the sample collector located at the screen.

[0010] Optionally, a bag dust collector is provided on the top of the sample collector.

[0011] Optionally, the sieve is placed in a horizontal drawer-like manner in the sample collector, one end of the sieve is connected to a sealing plate, and a handle is provided on a side wall of the sealing plate outside the sample collector.

[0012] Optionally, the coal grinding assembly includes a grinding roller and a grinding disc, and the grinding roller is arranged on the grinding disc.

[0013] Optionally, the separation assembly includes a separation cone, a separator rotor, a powder return channel, and a coal outlet pipeline.

[0014] The separation cone is coaxially sleeved on the outside of the coal drop pipe, and the space between the separation cone and the coal drop pipe forms a powder return channel. The separator rotor is arranged between the top of the separation cone and the top of the shell, and the coal outlet pipeline is connected to the light phase outlet of the separator rotor.

[0015] Optionally, the coal drop pipe and the bottom of the separation cone are both located above the grinding roller.

[0016] Optionally, the coal mill dynamic separator is also connected to a controller, and the controller is respectively connected to the sampling valve, the first weighing device, the sample outlet valve, the second weighing device, the vibration motor and the separator rotor.

[0017] The coal mill dynamic separator provided in the present application realizes real-time online adjustment of the fineness of the coal powder separated by the coal mill dynamic separator, improves the separation efficiency of the dynamic separator, and has the following beneficial effects compared with the prior art:

[0018] (1) By setting up a sampling component, including a sampling tube, a sampling valve, a sample collector, a screen and a receiving tank, during the grinding and separation process of the coal powder, the sample coal powder is screened into the receiving tank from the sample collector through the screen, and the coal powder qualification rate is calculated. According to the actual operating load of the boiler, the preset range of the coal powder fineness qualification rate is determined. If the qualification rate is within the preset range, the coal powder is output to the boiler through the light phase outlet of the separation component for combustion. If the qualification rate is less than the preset range, the coal powder is returned to the coal grinding component for further grinding and the frequency of the coal grinding component is adjusted. This setting can realize real-time online detection of the fineness of the separated coal powder, and obtain coal powder of qualified fineness, which helps the boiler to maintain a stable combustion state when participating in deep peak regulation, helps to flexibly adjust the combustion state of the boiler, improves the operating stability of the boiler under different conditions, and thus saves the use of coal powder.

[0019] (2) The vibration motor is used to vibrate the screen and the sample collector when the sample coal powder is sieved through the screen from the sample collector into the receiving tank, so as to accelerate the screening of the coal powder and help to fully screen the coal powder in the sample collector, which is beneficial to the calculation accuracy of the coal powder fineness qualification rate.

[0020] (3) By connecting the screen with a sealing plate, when the sampling valve is closed, the measurement accuracy of the first weighing device is improved, and the coal powder in the sample collector can be prevented from escaping.

[0021] (4) By placing the sample collector in a horizontal drawer-like manner, the screen can be easily replaced. When testing the fineness of the coal powder, the screen whose frequency of the separation component corresponds to the fineness of the coal powder is selected as the first screen, and then the screen whose fineness is smaller than the fineness of the coal powder at this time is selected as the second screen, and the qualified rate of the fineness of the coal powder under the two screens is calculated within a certain period of time. If the qualified rate of the fineness of the coal powder corresponding to the first screen is within the preset range, and the qualified rate of the fineness of the coal powder corresponding to the second screen is less than the value of the first screen within the first difference range, the fineness of the coal powder is too small, and the frequency of the separation component is adjusted to increase the fineness of the coal powder; if the qualified rate of the fineness of the coal powder corresponding to the second screen is less than the value of the first screen within the second difference range, the fineness of the coal powder is qualified at this time, which can avoid the influence of the small fineness of the coal powder on the combustion stability of the boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A schematic diagram of the structure of a coal mill dynamic separator provided in one embodiment of the present application;

[0024] Figure 2 A schematic structural diagram of a coal mill dynamic separator provided in another embodiment of the present application;

[0025] Figure 3 A schematic diagram of the structure of a screen provided in one embodiment of the present application;

[0026] Figure 4 A connection diagram of a controller provided in one embodiment of the present application;

[0027] Description of reference numerals:

[0028] 1: Shell, 2: Sampling assembly, 3: Coal grinding assembly, 4: Separation assembly, 5: Coal drop pipe, 6: Controller, 210: Sampling tube, 220: Sampling valve, 230: Sample collector, 231: First weigher, 232: Vibration motor, 233: Bag filter, 240: Screen, 241: Sealing plate, 242: Handle, 250: Sample receiving tank, 251: Second weigher, 310: Grinding roller, 320: Grinding disc, 410: Separation cone, 420: Separator rotor, 430: Powder return channel, 440: Coal outlet pipeline, 2301: Sampling valve. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the present application.

[0030] like Figure 1 As shown, the present application provides a coal mill dynamic separator, comprising: a shell 1 and a sampling assembly 2, a coal mill assembly 3 is arranged at the bottom of the shell 1, a separation assembly 4 is arranged at the top of the shell 1, the sampling assembly 2 is connected to the light phase outlet of the separation assembly 4, and a coal drop pipe 5 is also arranged in the shell 1.

[0031] The sampling assembly 2 includes a sampling tube 210, a sampling valve 220, a sample collector 230, a screen 240 and a receiving tank 250. One end of the sampling tube 210 is connected to the light phase outlet of the separation assembly 4, and the other end of the sampling tube 210 is connected to the inlet of the sample collector 230. The sampling valve 220 is arranged on the sampling tube 210. A screen 240 is arranged between the bottom outlet of the sample collector 230 and the inlet of the receiving tank 250. The bottom outlet of the sample collector 230 is located above the screen 240 and is provided with a sample outlet valve 2301.

[0032] A first weigher 231 is disposed at the bottom of the sample collector 230 , and a second weigher 251 is disposed at the bottom of the receiving tank 250 .

[0033] Specifically, a coal drop pipe 5 is provided in the shell 1, and the coal drop pipe 5 is used to transport the raw coal to be ground and separated to the coal mill assembly 3 in the shell 1 for grinding. As the coal mill assembly 3 rotates and grinds, the raw coal is squeezed into coal powder particles, and thrown to the outer circumference of the coal mill assembly 3 under the action of centrifugal force. Primary air is introduced from the bottom of the shell 1, and the primary air runs upward. The coal thrown to the outer circumference of the coal mill assembly 3 moves upward under the influence of the primary air to form a coal powder airflow, and then enters the separation assembly 4. The separation assembly 4 is used to separate the fineness of the coal powder. When the coal powder airflow approaches the separation assembly 4, the coal powder particles in the coal powder airflow are hit by the separation assembly 4, and the coal powder with larger particles is thrown out and falls back to the coal mill assembly 3 under the action of gravity to continue to be ground. The smaller particles are allowed to be output to the boiler through the light phase outlet of the separation assembly 4 for combustion, thereby achieving the selection of the fineness of the coal powder.

[0034] The sampling component 2 is connected to the light phase outlet of the separation component 4, so that in the process of grinding and separating the coal powder, the separated coal powder is sampled and tested in real time to better grasp the fineness of the coal powder, and the fineness of the coal powder obtained by the test is compared to see whether it meets the required fineness. If the fineness of the coal powder is too large or too small, the separator can be adjusted in time to make the coal powder reach the fineness that meets the combustion requirements. In this way, the online adjustment of the fineness of the coal powder can be achieved. When the boiler component participates in the deep peak-shaving operation, the fineness of the coal powder is detected in real time through the sampling component 2 according to the load of the boiler operation, and the dynamic separator is adjusted in time to obtain the fineness of the coal powder required by the boiler during high load, low load and peak-shaving. This is conducive to the coal powder having better ignition and combustion characteristics, optimizing the combustion in the boiler, making the combustion of the boiler more stable, and thus conducive to the stable operation of the boiler during deep peak-shaving.

[0035] The sampling assembly 2 includes a sampling tube 210, a sampling valve 220, a sample collector 230, a screen 240 and a receiving tank 250. The sampling tube 210 is connected to the light phase outlet of the separation assembly to sample the qualified coal powder separated by the separation assembly 4. The sampling valve 220 is arranged on the sampling tube 210. The opening and closing of the sampling valve 220 determines whether to sample the coal powder. The sample collector 230 is connected to the output end of the sampling tube 210. The sample obtained passes through the sampling tube 210 and moves to the sample collector 230 under the action of the airflow. A first weighing device 231 is provided at the bottom of the sample collector 230 for weighing the coal powder sample from the sampling tube 210. When the fineness of the coal powder sample needs to be tested, a suitable sieve 240 is selected, and the sample outlet valve 2301 at the bottom of the sample collector 230 is opened to sieve the sample coal powder into the receiving tank 250 through the sieve 240. A second weighing device 251 is provided at the bottom of the receiving tank 250 for weighing the sieved sample coal powder, and calculating the percentage of coal powder with qualified fineness in the sample coal powder (coal powder fineness qualified rate) according to the weight values ​​obtained by the first weighing device 231 and the second weighing device 251. The qualified rate calculation formula is G2 / G1, where G1 is the weight value of the first weighing device 231, and G2 is the weight value of the second weighing device 251. According to the actual operating load of the boiler, the preset range of the qualified rate of the coal powder fineness is determined. If the qualified rate is within the preset range, the coal powder is output to the boiler for combustion through the light phase outlet of the separation component 4. If the qualified rate is less than the preset range, the coal powder is returned to the coal grinding component 3 to continue to be ground and the frequency of the coal grinding component 3 is adjusted. This setting can realize real-time online detection of the fineness of the separated coal powder, and obtain coal powder with qualified fineness, which helps the boiler to maintain a stable combustion state when participating in deep peak regulation, helps to flexibly adjust the combustion state of the boiler, improve the operating stability of the boiler under different conditions, and thus save the use of coal powder.

[0036] Among them, the fineness of the coal powder can be controlled by adjusting the frequency of the separation component 4 of the coal mill dynamic separator. Therefore, it can be known that the frequency of the separation component 4 corresponds to the fineness of the coal powder during the coal powder fineness detection. At this time, when selecting the screen, the screen whose frequency of the separation component 4 corresponds to the fineness of the coal powder can be selected as the first screen, and then the screen whose fineness is smaller than the fineness of the coal powder at this time can be selected as the second screen, and the qualified rate of the coal powder fineness under the two screens is calculated within a certain period of time. If the qualified rate of the fineness of the coal powder corresponding to the first screen is within the preset range, and the qualified rate of the fineness of the coal powder corresponding to the second screen is less than the value of the first screen within the first difference range, the fineness of the coal powder is too small, and the frequency of the separation component 4 is adjusted to increase the fineness of the coal powder; if the qualified rate of the fineness of the coal powder corresponding to the second screen is less than the value of the first screen within the second difference range, the fineness of the coal powder is qualified at this time, and the second difference range is greater than the first difference range, so that the influence of the small fineness of the coal powder on the combustion stability of the boiler can be avoided. If the difference in the fineness qualification rates of the two sieves is smaller, it means that the coal powder fineness under the frequency of the existing separation component 4 is closer to the fineness corresponding to the second sieve (smaller sieve holes), which is the coal powder required for another finer specification. Therefore, it does not meet the fineness requirements of coal powder under existing conditions.

[0037] The present application realizes the real-time online adjustment of the fineness of the coal powder separated by the dynamic separator of the coal mill through the above scheme, and improves the separation efficiency of the dynamic separator. By setting a sampling component, including a sampling tube, a sampling valve, a sample collector, a screen and a receiving tank, during the grinding and separation process of the coal powder, the sample coal powder is screened into the receiving tank by the sample collector through the screen, and the coal powder qualification rate is obtained by calculation, and the preset range of the coal powder fineness qualification rate is determined according to the actual operating load of the boiler. If the qualification rate is within the preset range, the coal powder is output to the boiler through the light phase outlet of the separation component for combustion. If the qualification rate is less than the preset range, the coal powder is returned to the coal grinding component to continue to be ground and the frequency of the coal grinding component is adjusted. Such a setting can realize real-time online detection of the fineness of the separated coal powder, and obtain coal powder of qualified fineness, which helps the boiler to maintain a stable combustion state when participating in deep peak regulation, helps to flexibly adjust the combustion state of the boiler, improves the operating stability of the boiler under different states, and thus saves the use of coal powder.

[0038] Optionally, a vibration motor 232 is provided on the side wall of the sample collector 230 at the sieve 240 .

[0039] Specifically, the vibration motor 232 is used to vibrate the screen 240 and the sample collector 230 when the sample coal powder is sieved into the receiving tank 250 from the sample collector 230 through the screen 240, so as to accelerate the screening of the coal powder and help to fully screen the coal powder in the sample collector 230, which is beneficial to the calculation accuracy of the coal powder fineness qualification rate.

[0040] Optional, such as Figure 2 As shown, a bag filter 233 is provided on the top of the sample collector 230 .

[0041] Specifically, the bag filter 233 can connect the top of the sample collector 230 to the atmosphere, while preventing the coal powder in the sample collector 230 from escaping.

[0042] Optional, such as Figure 3 As shown, the screen 240 is placed in a horizontal drawer-like manner in the sample collector 230 , one end of the screen 240 is connected to a sealing plate 241 , and a handle 242 is provided on a side wall of the sealing plate 241 outside the sample collector 230 .

[0043] Specifically, the screen 240 is placed in a horizontal drawer-like manner in the sample collector 230, which facilitates the rapid replacement of the screen 240. A sealing plate 241 is connected to one end of the screen 240, and the area of ​​the sealing plate 241 is larger than the area of ​​the opening on the side wall of the sample collector 230 for the screen 240 to enter and exit, thereby improving the airtightness of the sample collector 230.

[0044] Optional, such as Figure 2 As shown, the coal grinding assembly 3 includes a grinding roller 310 and a grinding disc 320 , and the grinding roller 310 is arranged on the grinding disc 320 .

[0045] Specifically, the coal drop pipe 5 conveys the raw coal to be ground and separated to the grinding disc 320. The rotating grinding disc 320 interacts with the grinding roller 310 to grind and squeeze the raw coal into coal powder particles, thereby grinding the raw coal. At the same time, under the action of the centrifugal force generated by the rotation of the grinding disc 320, the ground coal powder is thrown to the outer edge of the circumference of the grinding disc 320, and is blown up by the primary wind entering from the bottom of the shell 1 to form a coal powder airflow, and enters the separation component 4 for separation, thereby grinding the raw coal.

[0046] Optionally, the separation assembly 4 includes a separation cone 410 , a separator rotor 420 , a powder return channel 430 , and a coal outlet pipeline 440 .

[0047] The separation cone 410 is coaxially sleeved on the outside of the coal drop pipe 5, and the space between the separation cone 410 and the coal drop pipe 5 forms a powder return channel 430. The separator rotor 420 is arranged between the top of the separation cone 410 and the top of the shell 1, and the coal outlet pipeline 440 is connected to the light phase outlet of the separator rotor 420.

[0048] Specifically, the coal powder airflow entrained by the primary wind rises in the space between the outer side of the separation cone 410 and the shell 1. When approaching the separator rotor 420, the coal powder in the coal powder airflow is impacted by the separator rotor 420. The coal powder with larger particles is thrown out and falls back to the coal grinding assembly 3 through the powder return channel 430 under the action of gravity to continue to be ground. The coal powder with smaller particles is allowed to be output to the boiler for combustion through the light phase outlet of the coal outlet pipeline 440 connected to the light phase outlet of the separator rotor 420, thereby achieving the selection of coal powder fineness.

[0049] By adjusting the frequency of the separator rotor 420 and controlling the rotation speed of the separator rotor 420, the momentum of the pulverized coal particles after leaving the separator rotor 420 is obtained, thereby changing the ability to separate the pulverized coal and adjusting the fineness of the pulverized coal.

[0050] Optionally, the bottom of the coal drop pipe 5 and the separation cone 410 are both located above the grinding roller 310. This facilitates the raw coal and the coal powder dropped from the separation assembly 4 to be sent back to the grinding roller 310 for grinding.

[0051] Optional, such as Figure 4 As shown, the coal mill dynamic separator is also connected to a controller 6, which is respectively connected to the sampling valve 220, the first weighing device 231, the sample outlet valve 2301, the second weighing device 251, the vibration motor 232 and the separator rotor 420.

[0052] Specifically, the controller 6 controls the opening and closing of the sampling valve 220 to sample the ground coal powder, and the coal powder is screened by opening the sampling valve 2301 and the vibration motor 232. The controller 6 calculates the coal powder fineness pass rate by receiving weight signals from the first weighing device 231 and the second weighing device 251, and adjusts the frequency of the separator rotor 420 according to the value of the coal powder fineness pass rate.

[0053] The technical solution of the present application is described in detail below with reference to specific embodiments.

[0054] The operation flow of the coal mill dynamic separator in this embodiment is as follows:

[0055] The coal drop pipe 5 conveys the raw coal to be ground and separated to the grinding disc 320. The rotating grinding disc 320 interacts with the grinding roller 310 to grind and squeeze the raw coal into coal powder particles, thereby grinding the raw coal. At the same time, under the action of the centrifugal force generated by the rotation of the grinding disc 320, the ground coal powder is thrown to the outer edge of the circumference of the grinding disc 320, and is blown up by the primary air entering from the bottom of the shell 1 to form a coal powder airflow, and enters the separation component 4 for separation.

[0056] During the grinding and separation process of coal powder, the controller 6 opens the sampling valve 220, so that the coal powder in the coal outlet pipeline 440 is transported to the sample collector 230 through the sampling tube 210. The sampling time is set in the controller 6. After the sampling is completed, the controller 6 closes the sampling valve 220 and collects the weight signal value G1 from the first weighing device 231. At the same time, the sampling valve 2301 and the vibration motor 232 are opened to screen the coal powder, and the sieve with the frequency of the separator rotor 420 corresponding to the fineness of the coal powder is selected as the first sieve. When the weight signal values ​​of the first weighing device 231 and the second weighing device 251 from the controller 6 remain unchanged, the weight signal value G2 from the second weighing device 251 is collected, and the controller 6 runs the coal powder fineness qualified rate calculation formula G2 / G1 to obtain the coal powder fineness qualified rate value A1, and compares the qualified rate with the preset range value. If the qualified rate A1 is less than the preset range, the coal powder is returned to the coal grinding component 3 to continue to be ground and the frequency of the coal grinding component 3 is adjusted.

[0057] If the qualified rate is within the preset range, the screen 240 is replaced, and a screen smaller than the fineness of the coal powder at this time is selected as the second screen, and the sampling steps are followed to sample again and calculate the qualified rate of the coal powder fineness. The obtained qualified rate value is A2. The controller 6 compares the values ​​of A1 and A2. If A2 is equal to A1, because the mesh of the second screen is smaller than that of the first screen, and the sampling amount is similar, the coal powder that can pass through the first screen cannot or only a small part can pass through the second screen under normal circumstances. If A2 is equal to A1, it means that the coal powder that can pass through the first screen can also pass through the second screen. Therefore, it is concluded that the fineness of the coal powder separated in this time period is less than the coal powder fineness specified under this condition, so the coal powder fineness is too small. By adjusting the frequency of the separation component 4, the coal powder fineness becomes larger. In this way, the influence of the small coal powder fineness on the combustion stability of the boiler can be avoided.

[0058] If the value of A2 is less than A1 within the first difference range, the fineness of the coal powder is too small, and the frequency of the separation component 4 is adjusted to increase the fineness of the coal powder; if the value of A2 is less than A1 within the second difference range, the fineness of the coal powder is qualified at this time, and it is output to the boiler for combustion through the light phase outlet of the coal outlet pipeline 440 connected to the light phase outlet of the separator rotor 420. The second difference range is larger than the first difference range, so that the influence of the small fineness of the coal powder on the combustion stability of the boiler can be avoided.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application is described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A coal mill dynamic separator, characterized in that: include: A shell (1) and a sampling assembly (2), wherein a coal grinding assembly (3) is arranged at the bottom of the shell (1), a separation assembly (4) is arranged at the top of the shell (1), the sampling assembly (2) is connected to the light phase outlet of the separation assembly (4), and a coal drop pipe (5) is also arranged in the shell (1); The sampling assembly (2) comprises a sampling tube (210), a sampling valve (220), a sample collector (230), a screen (240) and a receiving tank (250); one end of the sampling tube (210) is connected to the light phase outlet of the separation assembly (4); the other end of the sampling tube (210) is connected to the inlet of the sample collector (230); the sampling valve (220) is arranged on the sampling tube (210); a screen (240) is arranged between the bottom outlet of the sample collector (230) and the inlet of the receiving tank (250); and a sample outlet valve (2301) is arranged above the bottom outlet of the sample collector (230); A first weighing device (231) is disposed at the bottom of the sample collector (230), and a second weighing device (251) is disposed at the bottom of the receiving tank (250).

2. The coal mill dynamic separator according to claim 1, characterized in that: A vibration motor (232) is provided on the side wall of the sample collector (230) located at the screen (240).

3. The coal mill dynamic separator according to claim 2, characterized in that: A bag dust collector (233) is provided on the top of the sample collector (230).

4. The coal mill dynamic separator according to claim 3, characterized in that: The sieve (240) is placed in a horizontal drawer-like manner in the sample collector (230), one end of the sieve (240) is connected to a sealing plate (241), and a handle (242) is provided on a side wall of the sealing plate (241) outside the sample collector (230).

5. The coal mill dynamic separator according to claim 4, characterized in that: The coal grinding assembly (3) comprises a grinding roller (310) and a grinding disc (320), wherein the grinding roller (310) is arranged on the grinding disc (320).

6. The coal mill dynamic separator according to claim 5, characterized in that: The separation assembly (4) comprises a separation cone (410), a separator rotor (420), a powder return channel (430), and a coal outlet pipeline (440); The separation cone (410) is coaxially sleeved on the outer side of the coal drop pipe (5), and the space between the separation cone (410) and the coal drop pipe (5) forms the powder return channel (430). The separator rotor (420) is arranged between the top of the separation cone (410) and the top of the shell (1), and the coal outlet pipeline (440) is connected to the light phase outlet of the separator rotor (420).

7. The coal mill dynamic separator according to claim 6, characterized in that: The bottom of the coal drop pipe (5) and the separation cone (410) are both located above the grinding roller (310).

8. The coal mill dynamic separator according to claim 7, characterized in that: The coal mill dynamic separator is also connected to a controller (6), and the controller (6) is respectively connected to the sampling valve (220), the first weighing device (231), the sample outlet valve (2301), the second weighing device (251), the vibration motor (232) and the separator rotor (420).

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