A multi-stage pulverized coal separation device with remote adjustment function and separation method

Abstract

A multi-stage pulverized coal separation device with a remote adjustment function, comprising a housing, a three-stage pulverized coal separation fineness adjustment structure, and a separator control box. The three-stage pulverized coal separation fineness adjustment structure includes a primary separation retaining ring, a radial adjustment device, and an axial adjustment device. During use, this separation device screens the pulverized coal through the three-stage pulverized coal separation fineness adjustment structure and controls it via the separator control box. The multi-stage pulverized coal separation device with a remote adjustment function of the present invention can ensure that the pulverized coal after being ground by the coal mill efficiently enters the separation device, with higher pulverized coal separation efficiency, a wider fineness adjustment range, more uniform air-powder flow, smooth pulverized coal flow, and avoidance of re-powder short circuit. The electric adjustment mechanism and its control box are compactly arranged, easy to maintain, and convenient to operate, reducing the production operation cost. This separation device avoids the power consumption increase caused by the continuous operation of the motor and the overhaul and maintenance of the drive system, saving the equipment operation cost.

Description

Technical Field

[0001] The invention belongs to the field of pulverized coal separation equipment for pulverized coal preparation systems, and particularly relates to a multi-stage pulverized coal separation equipment with a remote adjustment function and a separation method thereof. Background Art

[0002] At present, medium-speed coal mills (also known as roller coal mills) are widely used in industrial pulverized coal preparation systems such as power, cement, coal chemical industry, and metallurgy. The upper part of the coal mill is connected to a radial baffle type pulverized coal separation equipment, and the pulverized coal after grinding is blown up by hot air and entrained into the pulverized coal separation equipment. The pulverized coal separation equipment is an indispensable key equipment in the pulverized coal preparation system, which can classify according to the particle size of pulverized coal particles. The qualified pulverized coal particles are selected and enter the next process for production, and the unqualified pulverized coal particles are separated and returned to the coal mill for re-grinding.

[0003] In the prior art, there are mainly two types of pulverized coal separation equipment: baffle gap control separation and blade and rotating cage active rotation separation. The baffle gap control type pulverized coal separation equipment has a single structure, poor sorting ability for pulverized coal particles, and poor fineness and uniformity index of the finished pulverized coal, seriously affecting the requirements of boiler combustion or subsequent processes for the finished pulverized coal. For the sorting equipment of multi-outlet pulverized coal pipes, there is a large deviation in the coal volume between each powder pipe, seriously affecting the combustion effect of a positive pressure direct injection boiler. At the same time, the baffle of the existing baffle gap control type pulverized coal separation equipment needs to be climbed by workers to the top of the equipment to adjust the baffle angle, which is inconvenient to operate and is a high-altitude operation, seriously affecting the personal safety of operation and maintenance personnel. Although the blade and rotating cage active rotation separation type pulverized coal separation equipment can realize the remote on-line adjustment of the pulverized coal fineness through an electric motor, has strong sorting ability for pulverized coal particles, and the indexes such as the fineness and uniformity index of the finished pulverized coal are also relatively excellent, but the blade and rotating cage active rotation separation type pulverized coal separation equipment needs to add rotating blades, rotating cages and the electric motor and control system for driving their rotation, resulting in continuous energy consumption during the pulverized coal separation process. The driving device and its control system are relatively complex and need to be maintained and overhauled regularly. The continuous rotation of the components also brings problems of equipment vibration and noise. Summary of the Invention

[0004] In order to solve the deficiencies existing in the prior art, the purpose of the present invention is to provide a multi-stage pulverized coal separation equipment with a remote adjustment function and a separation method thereof. After the raw coal is ground by a medium-speed coal mill, the pulverized coal is blown into the separator equipment by hot air, and is efficiently separated through multiple adjustments by four devices including a primary separation retaining ring, a radial adjustment device, an axial adjustment device, and a distributor shunt comb. An outlet powder volume adjustment device is provided at the pulverized coal outlet. The medium-speed coal mill pulverized coal separation equipment has the characteristics of low pressure drop, high efficiency, good pulverized coal fineness adjustment performance, and uniform multi-outlet powder output quality.

[0005] The present invention adopts the following technical solutions:

[0006] A multi-stage pulverized coal separation device with a remote adjustment function, comprising: a housing, a three-stage pulverized coal separation fineness adjustment structure, and a separator control box. The three-stage pulverized coal separation fineness adjustment structure includes a primary separation retaining ring, a radial adjustment device, and an axial adjustment device; a coal dropping pipe is provided at the center of the housing, an inner cone is provided on the outer side of the lower part of the coal dropping pipe, the bottom end of the inner cone is connected to the primary separation retaining ring, both the inner cone and the primary separation retaining ring are arranged inside the housing, and the primary separation retaining ring is arranged at the bottom end inside the housing; the upper end diameter of the inner cone is larger than its lower end diameter, a radial adjustment device is provided at the outer edge of its upper end, and the radial adjustment device communicates the space between the housing and the inner cone and the space between the inner cone and the coal dropping pipe; a cylinder is provided at the middle section of the coal dropping pipe, and an axial adjustment device is provided at the cylinder; a flow dividing comb and a distributor outer cone are sequentially provided on the outer side of the upper part of the coal dropping pipe, an outlet powder plane is provided at the upper end of the flow dividing comb, and an outlet powder quantity adjustment device is provided above the outlet powder plane; an electric adjustment mechanism is further provided above the housing, and the separator control box controls the radial adjustment device, the axial adjustment device, and the outlet powder quantity adjustment device by controlling the electric adjustment mechanism.

[0007] As a preferred embodiment of the present invention, the primary separation retaining ring includes an upper end surface and a lower end surface, both the upper end surface and the lower end surface are connected to the housing, and both the upper end surface and the lower end surface have a certain angle with the horizontal plane, and the upper end surface forms an integral sealed cavity between the lower end surface and the separator housing.

[0008] As a preferred embodiment of the present invention, the radial adjustment device includes a plurality of radial baffles, and the radial baffles are combined by a connecting rod structure.

[0009] As a preferred embodiment of the present invention, the number of the radial baffles is 20 - 30 pieces.

[0010] As a preferred embodiment of the present invention, the radial baffles are circumferentially evenly distributed along the central axis of the coal dropping pipe, and the angle between it and the vertical direction of the axis is adjustable.

[0011] As a preferred embodiment of the present invention, the axial adjustment device includes a plurality of axial baffles, the axial baffles are installed between the cylinder and the coal dropping pipe, and they are circumferentially evenly distributed along the axis of the separation device.

[0012] As a preferred embodiment of the present invention, the number of the axial baffles is 12 - 24 pieces, and the angle between the axial baffles and the horizontal direction is adjustable.

[0013] As a preferred embodiment of the present invention, the axial baffle rotating shaft of the axial adjustment device extends out of the outer cone of the distributor, and the connecting plate connects all the axial baffles into one body.

[0014] As a preferred embodiment of the present invention, a connecting plate support mechanism is provided below the connecting plate, and the connecting plate support mechanism is evenly distributed along the axial direction.

[0015] As a preferred embodiment of the present invention, the connecting plate support mechanism includes a support frame, an adjustment bolt, a top support bearing, and a guide post.

[0016] As a preferred embodiment of the present invention, a top support bearing is installed on the top of the support frame, the outer ring of the top support bearing is supported on the lower plane of the connecting plate, a guide post is fixedly connected behind the top support bearing, the guide post passes through the guide groove of the connecting plate, the guide post and the top support bearing are installed on the same plane, and an adjustment bolt is provided below the plane.

[0017] As a preferred embodiment of the present invention, a conical cavity with a larger upper part and a smaller lower part is formed between the flow dividing comb and the outer cone of the distributor. The upper part of the flow dividing comb is connected to the plane of the powder outlet, and the lower part is connected to the cylinder body.

[0018] As a preferred embodiment of the present invention, the flow dividing comb is circumferentially and evenly provided with comb teeth gaps along the central axis of the coal dropping pipe. The gaps have a certain angle with the normal wall thickness direction along the depth direction from the inside to the outside, and the angle is 0° to 70°.

[0019] As a preferred embodiment of the present invention, a one-way baffle door is provided in the annular space between the upper end of the cylinder body and the lower end of the outer cone of the distributor.

[0020] As a preferred embodiment of the present invention, the one-way baffle door includes a wind blocking cone and a wind blocking plate.

[0021] As a preferred embodiment of the present invention, the wind blocking cone surrounds the outside of the cylinder body, and its installation angle with the vertical direction is 30°.

[0022] As a preferred embodiment of the present invention, the upper end of the wind blocking plate has a lifting ring, which is connected to the upper top plate of the housing, and the lower end is lapped on the wind blocking cone.

[0023] As a preferred embodiment of the present invention, electric adjustment mechanisms are distributed and installed on the radial adjustment device, the axial adjustment device, and the outlet powder volume adjustment device.

[0024] As a preferred embodiment of the present invention, the electric adjustment mechanism can adjust the angles of the radial adjustment device and the axial adjustment device.

[0025] As a preferred embodiment of the present invention, the separation control box is connected to the electric adjustment mechanism through a cable, and then controls the electric adjustment mechanisms and obtains position information.

[0026] As a preferred embodiment of the present invention, the separation control box communicates with the remote control and adjustment system, and then realizes the remote adjustment function of the radial adjustment device, the axial adjustment device, and the outlet powder amount adjustment device.

[0027] A multi-stage pulverized coal separation method with a remote adjustment function, which is implemented by using the separation equipment as described above; the separation method includes the following steps:

[0028] Step 1), primary separation: raw coal is ground into pulverized coal in the grinding area, and the primary hot air carries the pulverized coal to form a pulverized coal-air mixture and goes upward to the inlet of the separation equipment. Part of the pulverized coal-air mixture collides with the primary separation retaining ring at the inlet of the separation equipment and falls back to the grinding area under the action of gravity for re-grinding, and part of the pulverized coal-air mixture passes through the primary separation retaining ring;

[0029] Step 2), secondary separation: the pulverized coal-air mixture passing through the primary separation retaining ring enters the separation area of the radial adjustment device along the channel between the housing and the inner cone. When the pulverized coal-air mixture passes through the radial adjustment device, it collides with the radial baffle. The coarser pulverized coal falls back to the grinding area under the action of gravity through the inner cone for re-grinding, and part of the pulverized coal-air mixture passes through the radial adjustment device;

[0030] Step 3), tertiary separation: for the pulverized coal-air mixture passing through the radial adjustment device, inside the inner cone, part of the coarser pulverized coal falls back inside the cone, and the rest of the pulverized coal-air mixture enters the separation area of the axial adjustment device through the cylinder. When the pulverized coal-air mixture passes through the axial adjustment device, it collides with the axial baffle. The coarser pulverized coal falls back to the grinding area under the action of gravity through the inner cone for re-grinding, and part of the pulverized coal-air mixture passes through the axial adjustment device;

[0031] Step 4), auxiliary separation: the pulverized coal-air mixture passing through the axial adjustment device enters the outer cone and the flow dividing comb of the separator. The coarser pulverized coal approaches the flow dividing comb, and under the action of the flow dividing comb, it passes through the air blocking plate and falls back to the grinding area through the inner cone;

[0032] Step 5), qualified pulverized coal: the pulverized coal passing through the flow dividing comb enters the coal dropping pipe after being adjusted by the outlet powder amount adjustment device through the powder outlet plane, and then is blown into the boiler for combustion.

[0033] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0034] A multi-stage pulverized coal separation device with a remote adjustment function according to the present invention can ensure that the pulverized coal after being ground by a coal mill efficiently enters the separation device, has a higher pulverized coal separation efficiency, a wider fineness adjustment range, more uniform air-powder flow, smooth pulverized coal flow, prevents pulverized coal from accumulating inside the device, and avoids the short circuit of the returned powder. The electric adjustment mechanism and its control box are compactly arranged, easy to maintain, and convenient to operate, reducing the production operation cost. The separation system has excellent performance and reduces the resistance of air-powder flow. Compared with the existing static baffle separation device, it can ensure the safe and efficient operation of the separation device, improve the pulverized coal quality of the coal grinding system, and meet the requirements of the pulverizing system for the fineness and uniformity index of pulverized coal; compared with the existing dynamic rotary separator, it avoids the increase in power consumption caused by the continuous operation of the motor and the maintenance of the drive system, saving the equipment operation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 FIG. is a schematic structural diagram of a multi-stage pulverized coal separation device with a remote adjustment function according to the present invention;

[0036] Figure 2 FIG. is a schematic diagram of the linkage of the radial adjustment device of a multi-stage pulverized coal separation device with a remote adjustment function according to the present invention;

[0037] Figure 3 FIG. is a schematic diagram of the linkage of the axial adjustment device of a multi-stage pulverized coal separation device with a remote adjustment function according to the present invention;

[0038] Figure 4 FIG. is a schematic diagram of the connection disk support mechanism of a multi-stage pulverized coal separation device with a remote adjustment function according to the present invention;

[0039] Figure 5 FIG. is a schematic diagram of the shunt comb and the wind baffle of a multi-stage pulverized coal separation device with a remote adjustment function according to the present invention.

[0040] In the figure:

[0041] The first-stage separation retaining ring 1, the housing 2, the inner cone 3, the radial adjustment device 4, the electric adjustment mechanism 5, the connection disk support mechanism 6, the connection disk 7, the outer cone of the distributor 8, the shunt comb 9, the powder outlet plane 10, the coal dropping pipe 11, the outlet powder quantity adjustment device 12, the axial adjustment device 13, the cylinder 14, the separator control box 15, the support frame 16, the adjustment bolt 17, the top support bearing 18, the guide rod 19, the powder chute cone 20, the wind baffle 21. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] The following further describes the present application with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and cannot be used to limit the protection scope of the present application.

[0043] Figure 1This is a schematic structural diagram of a multi-stage pulverized coal separation device with a remote adjustment function according to the present invention. As Figure 1 shown, a multi-stage pulverized coal separation device with a remote adjustment function according to the present invention includes a housing 2, a three-stage pulverized coal separation fineness adjustment structure, and a separation control box 15.

[0044] The three-stage pulverized coal separation fineness adjustment structure includes a primary separation retaining ring 1, a radial adjustment device 4, and an axial adjustment device 13.

[0045] A coal dropping pipe 11 is arranged at the center of the housing 2. An inner cone 3 is arranged outside the lower side of the coal dropping pipe 11. An annular inlet is arranged on the housing 2 and the inner cone 3. The bottom end of the inner cone 3 is connected to the primary separation retaining ring 1. Both the inner cone 3 and the primary separation retaining ring 1 are arranged inside the housing 2. The primary separation retaining ring 1 is arranged at the bottom end inside the housing 2; the upper end diameter of the inner cone 3 is larger than its lower end diameter. A radial adjustment device 4 is arranged at the outer edge of its upper end. The radial adjustment device 4 communicates the space between the housing 2 and the inner cone 3 and the space between the inner cone 3 and the coal dropping pipe 11; an axial adjustment device 13 is arranged at the middle section of the coal dropping pipe 11.

[0046] A flow dividing comb 9 and a distributor outer cone 8 are successively arranged outside the upper side of the coal dropping pipe 11. An outlet powder plane 10 is arranged at the upper end of the flow dividing comb 9. An outlet powder amount adjustment device 12 is arranged above the outlet powder plane 10.

[0047] An electric adjustment mechanism 5 is further arranged above the housing 2. The separator control box 15 controls the radial adjustment device 4, the axial adjustment device 13, and the outlet powder amount adjustment device 12 by controlling the electric adjustment mechanism 5.

[0048] The primary separation retaining ring 1 preferably consists of two conical circular plates, namely an upper end face and a lower end face. Both the upper end face and the lower end face are connected to the housing 2, and both the upper end face and the lower end face have a certain angle with the horizontal plane. The upper end face forms an integral sealed cavity between the lower end face and the separator housing 2. The angle between the upper end face of the separation retaining ring 1 and the horizontal direction is preferably 45°, the angle between its lower end face and the horizontal direction is preferably 52°, and a blow-proof and wear-resistant guard plate is preferably attached to the windward surface of its lower end face.

[0049] As Figure 2 shown, the radial adjustment device 4 includes a number of radial baffles. Adjacent radial baffles are combined through a connecting rod structure. When one of the radial baffles rotates around the rotating shaft, the radial baffle pushes the connecting rod to drive the adjacent radial baffles to rotate synchronously. The number of radial baffles is preferably 20 - 30 pieces, more preferably 24 pieces. The radial baffles are circumferentially distributed uniformly along the central axis of the coal dropping pipe 11, and the angle between it and the vertical direction of the axis is adjustable.

[0050] AsFigure 3 As shown, the axial adjustment device 13 includes a number of axial baffles. The axial baffles are installed between the cylinder 14 and the coal dropping pipe 11. The cylinder 14 is preferably installed above the top surface of the housing 2. The axial baffles are evenly distributed circumferentially along the axis of the separation device. The number of axial baffles is preferably 12 - 24 pieces, and more preferably 20 pieces. The angle between the axial baffle and the horizontal direction is adjustable. The axial baffle rotating shaft of the axial adjustment device 13 extends out of the outer cone 8 of the distributor, and the connecting plate 7 connects all the axial baffles into one body.

[0051] As Figure 4 As shown, a connecting plate support mechanism 6 is provided below the connecting plate 7. The connecting plate support mechanism 6 is evenly distributed along the axial direction. The connecting plate support mechanism 6 includes a support frame 16, an adjusting bolt 17, a top support bearing 18 and a guide post 19. The top of the support frame 16 is equipped with a top support bearing 18. The outer ring of the top support bearing 18 is supported on the lower plane of the connecting plate 7. A guide post 19 is fixedly connected behind the top support bearing 18. The upper end of the guide post 19 passes through the guide groove of the connecting plate 7. The guide groove is an arc segment with the same diameter and center. It is evenly distributed on the circumference of the connecting plate 7. The number of guide grooves is preferably 5. The guide post 19 and the top support bearing 18 are installed on the same plane. An adjusting bolt 17 is provided below the plane. The adjusting bolt 17 can adjust the height position of the connecting plate 7. When the electric adjustment mechanism 5 pushes the connecting plate 7 to move, the connecting plate 7 makes a circular motion under the action of the guide post 19, thereby driving the axial adjustment device 13 to rotate a certain angle. The rotation range of the axially rotating baffle is preferably that the angle between the axial baffle and the vertical direction is 0° - 72°.

[0052] As Figure 5 As shown, the conical cavity between the flow dividing comb 9 and the outer cone 8 of the distributor is larger at the top and smaller at the bottom. The cavity depth is preferably 50 mm. The upper part of the flow dividing comb 9 is connected to the powder outlet plane 10, and the lower part is connected to the cylinder 14. The flow dividing comb 9 is evenly distributed circumferentially along the central axis of the coal dropping pipe 11 with comb teeth gaps. The gaps have a certain angle with the normal wall thickness direction along the depth direction from the inside to the outside. The angle is preferably 0° - 70°. The thickness of the flow dividing comb 9 is preferably 16 mm. The width of the comb teeth gaps is preferably 10 mm. The gaps have a certain angle with the wall thickness direction along the depth direction from the inside to the outside. The angle is preferably 55°. The number of comb teeth is preferably 60.

[0053] A one-way baffle door is arranged in the annular space between the upper end of the cylinder 14 and the lower end of the outer cone 8 of the distributor. The one-way baffle door includes a wind blocking cone 20 and a wind blocking plate 21. The wind blocking cone 20 surrounds the outside of the cylinder 14. Its installation angle with the vertical direction is 30°. The upper end of the wind blocking plate 21 has a lifting ring, which is connected to the upper roof plate of the housing 2, and the lower end is lapped on the wind blocking cone 20. The wind blocking plates 21 are evenly distributed circumferentially along the axis of the coal mill. The number is preferably 20 pieces.

[0054] The number of pulverized coal pipe inlets on the plane of the powder outlet 10 is preferably 4. An outlet powder quantity adjusting device 12 is provided at each outlet. The electric adjusting mechanism 5 controls the area of the internal shrinkage hole. The electric adjusting mechanism 5 is connected to the control box 15 of the pulverized coal separation equipment to realize the communication of the remote angle adjustment command and the local position status.

[0055] The radial adjusting device 4, the axial adjusting device 13 and the outlet powder quantity adjusting device 12 are respectively installed with an electric adjusting mechanism 5, and the electric adjusting mechanism 5 can adjust the angles of the radial adjusting device 4 and the axial adjusting device 13.

[0056] The separation control box 15 is connected to the electric adjusting mechanism 5 through a cable, and then controls each electric adjusting mechanism 5 and obtains position information. The separation control box 15 communicates with the remote control and adjustment system, and then realizes the remote adjustment function of the radial adjusting device 4, the axial adjusting device 13 and the outlet powder quantity adjusting device 12.

[0057] A multi-stage pulverized coal separation method with a remote adjustment function, the separation method is realized by using the above separation equipment, and the separation method includes the following steps:

[0058] Step 1), primary separation: The raw coal is ground into pulverized coal in the grinding area. The primary hot air carries the pulverized coal to form a pulverized coal-air mixture and goes upward to the inlet of the separation equipment. Part of the pulverized coal-air mixture collides with the primary separation retaining ring 1 at the inlet of the separation equipment and falls back to the grinding area under the action of gravity for re-grinding, and part of the pulverized coal-air mixture passes through the primary separation retaining ring 1;

[0059] Step 2), secondary separation: The pulverized coal-air mixture passing through the primary separation retaining ring 1 enters the separation area of the radial adjusting device 4 along the channel between the housing 2 and the inner cone 3. When the pulverized coal-air mixture passes through the radial adjusting device 4, it collides with the radial baffle. The coarser pulverized coal falls back to the grinding area under the action of gravity through the inner cone 3 for re-grinding, and part of the pulverized coal-air mixture passes through the radial adjusting device 4;

[0060] Step 3), tertiary separation: The pulverized coal-air mixture passing through the radial adjusting device 4, inside the inner cone 3, part of the coarser pulverized coal falls back inside the cone, and the remaining pulverized coal-air mixture enters the separation area of the axial adjusting device 13 through the cylinder 14. When the pulverized coal-air mixture passes through the axial adjusting device 13, it collides with the axial baffle. The coarser pulverized coal falls back to the grinding area under the action of gravity through the inner cone 3 for re-grinding, and part of the pulverized coal-air mixture passes through the axial adjusting device 13;

[0061] Step 4), auxiliary separation: The pulverized coal-air mixture passing through the axial adjusting device 13 enters the outer cone 8 and the flow dividing comb 9 of the separator. The coarser pulverized coal approaches the flow dividing comb 9, and under the action of the flow dividing comb 9, it passes through the air blocking plate 21 and falls back to the grinding area through the inner cone 3;

[0062] Step 5), qualified pulverized coal: The pulverized coal passing through the shunt comb 9 enters the coal dropping pipe 11 after being adjusted by the outlet powder quantity adjusting device 12 through the powder outlet plane 10, and then is blown into the boiler for combustion.

[0063] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0064] The present invention can ensure that the pulverized coal after being ground by the coal mill efficiently enters the separation equipment, with higher pulverized coal separation efficiency, a wider fineness adjustment range, more uniform air-powder flow, smooth pulverized coal flow, preventing the accumulation of pulverized coal inside the equipment and avoiding the short circuit of the returned powder. The electric adjusting mechanism and its control box are compactly arranged, easy to maintain and convenient to operate, reducing the production operation cost. The separation system has excellent performance, reducing the resistance of air-powder flow. Compared with the existing static baffle separation equipment, it can ensure the safe and efficient operation of the separation equipment, improve the pulverized coal quality of the coal mill powder preparation system, and meet the requirements of the powder preparation system for the fineness and uniformity index of pulverized coal; compared with the existing dynamic rotary separator, it avoids the increase in power consumption caused by the continuous operation of the motor and the overhaul and maintenance of the drive system, saving the equipment operation cost.

[0065] The applicant of the present invention has made a detailed description and illustration of the embodiments of the present invention in combination with the accompanying drawings of the specification. However, those skilled in the art should understand that the above embodiments are only the preferred implementation schemes of the present invention, and the detailed description is only to help readers better understand the spirit of the present invention, rather than a limitation on the protection scope of the present invention. On the contrary, any improvement or modification based on the spirit of the present invention should fall within the protection scope of the present invention.

Claims

1. A multi-stage pulverized coal separation device with a remote adjustment function, comprising: A housing (2), a three - stage pulverized coal separation fineness adjustment structure, and a separator control box (15), characterized in that: The three-stage pulverized coal separation fineness adjustment structure includes a primary separation retaining ring (1), a radial adjustment device (4), and an axial adjustment device (13); a coal dropping pipe (11) is arranged at the center of the housing (2), an inner cone (3) is arranged on the outer side of the lower part of the coal dropping pipe (11), the bottom end of the inner cone (3) is connected to the primary separation retaining ring (1), both the inner cone (3) and the primary separation retaining ring (1) are arranged inside the housing (2), and the primary separation retaining ring (1) is arranged at the bottom end inside the housing (2); the upper end diameter of the inner cone (3) is larger than its lower end diameter, a radial adjustment device (4) is arranged at the outer edge of its upper end, and the radial adjustment device (4) communicates the space between the housing (2) and the inner cone (3) and the space between the inner cone (3) and the coal dropping pipe (11); a cylinder (14) is arranged at the middle section of the coal dropping pipe (11), and an axial adjustment device (13) is arranged at the cylinder (14); a flow dividing comb (9) and a distributor outer cone (8) are successively arranged on the outer side of the upper part of the coal dropping pipe (11), a conical cavity with a larger upper part and a smaller lower part is formed between the flow dividing comb (9) and the distributor outer cone (8), a powder outlet plane (10) is arranged at the upper end of the flow dividing comb (9), and an outlet powder quantity adjustment device (12) is arranged above the powder outlet plane (10); an electric adjustment mechanism (5) is further arranged above the housing (2), and the separator control box (15) controls the radial adjustment device (4), the axial adjustment device (13), and the outlet powder quantity adjustment device (12) by controlling the electric adjustment mechanism (5); the axial adjustment device (13) includes a plurality of axial baffles, the axial baffles are installed between the cylinder (14) and the coal dropping pipe (11), and are circumferentially and evenly distributed along the axis of the separation device; the number of the axial baffles is 12 to 24, and the included angle between the axial baffles and the horizontal direction is adjustable; the axial baffle rotating shaft of the axial adjustment device (13) extends out of the distributor outer cone (8), and a connecting disk (7) connects all the axial baffles into a whole; a connecting disk support mechanism (6) is arranged below the connecting disk (7), and the connecting disk support mechanism (6) is evenly distributed along the axis direction; the connecting disk support mechanism (6) includes a support frame (16), an adjusting bolt (17), a top support bearing (18), and a guide post (19); a top support bearing (18) is installed at the top of the support frame (16), the outer ring of the top support bearing (18) is supported on the lower plane of the connecting disk (7), a guide post (19) is fixedly connected behind the top support bearing (18), the guide post (19) passes through the guide groove of the connecting disk (7), the guide post (19) and the top support bearing (18) are installed on the same plane, and an adjusting bolt (17) is arranged below the plane, and the adjusting bolt (17) can adjust the height position of the connecting disk (7); electric adjustment mechanisms (5) are respectively installed on the radial adjustment device (4), the axial adjustment device (13), and the outlet powder quantity adjustment device (12);The electric adjustment mechanism (5) can perform angular adjustment on the radial adjustment device (4) and the axial adjustment device (13); the separation control box (15) is connected to the electric adjustment mechanism (5) through a cable, and then controls each electric adjustment mechanism (5) and obtains position information; the separation control box (15) communicates with the remote control and adjustment system, so as to realize the remote adjustment function of the radial adjustment device (4), the axial adjustment device (13) and the outlet powder quantity adjustment device (12).; 2. A multi - stage pulverized coal separation device with a remote adjustment function according to claim 1, characterized in that: The first - stage separation retaining ring (1) includes an upper end face and a lower end face. Both the upper end face and the lower end face are connected to the housing (2), and both the upper end face and the lower end face have a certain angle with the horizontal plane. The upper end face forms an integral sealed cavity between the lower end face and the separator housing (2).

3. A multi - stage pulverized coal separation device with a remote adjustment function according to claim 1, characterized in that: The radial adjustment device (4) includes a number of radial baffles, and the radial baffles are combined by a connecting rod structure; The number of the radial baffles is 20 - 30; The radial baffles are circumferentially and evenly distributed along the central axis of the coal - dropping pipe (11), and the angle between them and the vertical direction of the axis is adjustable.

4. A multi - stage pulverized coal separation device with a remote adjustment function according to claim 1, characterized in that: The upper part of the flow - dividing comb (9) is connected to the powder outlet plane (10), and the lower part is connected to the cylinder body (14); The flow - dividing comb (9) is circumferentially and evenly distributed with comb - tooth gaps along the central axis of the coal - dropping pipe (11). The gaps have a certain angle with the normal wall - thickness direction along the depth direction from the inside to the outside, and the angle is 0° - 70°.

5. A multi - stage pulverized coal separation device with a remote adjustment function according to claim 4, characterized in that: A one - way baffle door is arranged in the annular space between the upper end of the cylinder body (14) and the lower end of the distributor outer cone (8); The one - way baffle door includes a wind - blocking cone (20) and a wind - blocking plate (21); The wind - blocking cone (20) surrounds the outside of the cylinder body (14), and its installation angle with the vertical direction is 30°; The upper end of the wind - blocking plate (21) has a lifting ring, which is connected to the upper roof of the housing (2), and the lower end is lapped on the wind - blocking cone (20).

6. A multi - stage pulverized coal separation method with a remote adjustment function, characterized in that: The separation method is realized by using the separation device according to any one of claims 1 to 5; The separation method includes the following steps: Step 1), primary separation: The raw coal is ground into pulverized coal in the grinding area. The primary hot air carries the pulverized coal to form a pulverized - coal - air mixture and goes upward to the inlet of the separation device. Part of the pulverized - coal - air mixture collides with the first - stage separation retaining ring (1) at the inlet of the separation device and falls back to the grinding area under the action of gravity for re - grinding, and part of the pulverized - coal - air mixture passes through the first - stage separation retaining ring (1); Step 2), secondary separation: The pulverized - coal - air mixture passing through the first - stage separation retaining ring (1) enters the separation area of the radial adjustment device (4) along the channel between the housing (2) and the inner cone (3). When the pulverized - coal - air mixture passes through the radial adjustment device (4), it collides with the radial baffles. The coarser pulverized coal falls back to the grinding area through the inner cone (3) under the action of gravity for re - grinding, and part of the pulverized - coal - air mixture passes through the radial adjustment device (4); Step 3), tertiary separation: The pulverized coal-air mixture passing through the radial adjustment device (4) falls back partially in the inner cone (3) within the inner cone body, and the remaining pulverized coal-air mixture enters the separation area of the axial adjustment device (13) through the cylinder body (14). When the pulverized coal-air mixture passes through the axial adjustment device (13), it collides with the axial baffle, and the coarser pulverized coal falls back to the grinding area through the inner cone (3) under the action of gravity for re-grinding, and part of the pulverized coal-air mixture passes through the axial adjustment device (13). Step 4), auxiliary separation: The pulverized coal-air mixture passing through the axial adjustment device (13) enters the outer cone (8) of the separator and the flow dividing comb (9). The coarser pulverized coal approaches the flow dividing comb (9), and under the action of the flow dividing comb (9), it falls back to the grinding area through the air blocking plate (21) and the inner cone (3). Step 5), qualified pulverized coal: The pulverized coal passing through the flow dividing comb (9) enters the coal dropping pipe (11) after being adjusted by the outlet pulverized coal quantity adjustment device (12) through the outlet pulverized coal plane (10), and then is blown into the boiler for combustion.

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