Feed pipe structure of boiler auxiliary coal mill of thermal power plant

Abstract

The invention relates to the technical field of coal mills, in particular to a thermal power plant boiler auxiliary machine coal mill feeding pipe structure which is characterized in that a pretreatment mechanism is arranged at the top of a feeding bin, and the pretreatment mechanism crushes materials through extrusion; the grinding mechanism is arranged in the feeding bin, and the grinding mechanism conducts secondary smashing on materials through rotation; the anti-blocking mechanism is communicated with the interior of the feeding bin; the joint of the anti-blocking mechanism and the feeding bin is lower than the joint of the grinding mechanism and the feeding bin; and the anti-blocking mechanism is used for fluidizing and dredging materials in the feeding bin by introducing air flow, so that the materials fall smoothly. The pretreatment mechanism is arranged at the top of the feeding bin to extrude and crush materials, so that the subsequent grinding load is reduced; the grinding mechanism is arranged in the feeding bin to realize secondary crushing, so that the fineness and the uniformity of the pulverized coal are improved; the anti-blocking mechanism adopts low-position connection and introduces air flow to fluidize and dredge materials, so that blocking is effectively prevented, smooth falling of the materials is guaranteed, and shutdown and manual cleaning frequency is reduced.

Description

Technical Field

[0001] This invention relates to the field of coal mill technology, and more specifically to a feed pipe structure for a coal mill, an auxiliary machine for boilers in thermal power plants. Background Technology

[0002] During operation, boilers in thermal power plants require coal to be pulverized to a certain fineness to ensure complete combustion within the furnace. As a crucial component of boiler auxiliary equipment, the coal mill's feed pipe structure directly impacts the continuity of coal transport and pulverization efficiency. In existing technologies, raw coal typically enters the mill through a feed hopper, relying on gravity for initial transport. However, during storage and transportation, large pieces of coal, gangue, and impurities easily mix into the raw coal, leading to increased wear, blockages, or operational instability if directly fed into the mill. Therefore, some feed pipe structures are equipped with pre-treatment devices to pre-crush or screen the material before it enters the mill. Existing pre-treatment devices often rely on simple crushing or screening, which are prone to failure when encountering hard lumps or coal with high moisture content, resulting in excessive grinding loads. When the coal has high moisture content, a high proportion of fine powder, or uneven feeding speed, accumulation can easily form at the bottom of the feed hopper and at pipe bends, causing feeding difficulties or even shutdowns. Most existing structures rely on manual or mechanical methods to clear blockages, lacking real-time, automatic anti-blockage measures, which affects the continuous operation of equipment and power generation efficiency. Summary of the Invention

[0003] (I) Purpose of the Invention

[0004] The purpose of this invention is to provide a feed pipe structure for a coal mill auxiliary machine in a thermal power plant boiler. This structure involves setting a pre-treatment mechanism at the top of the feed hopper to compress and crush the material, reducing the subsequent grinding load; setting a grinding mechanism inside the feed hopper to achieve secondary crushing, improving the fineness and uniformity of the coal powder; and using a low-position connection and introducing airflow to fluidize and unclog the material, effectively preventing blockage, ensuring smooth material flow, and reducing downtime and manual cleaning frequency.

[0005] (II) Technical Solution

[0006] To address the above problems, this invention provides a feed pipe structure for a coal mill, an auxiliary equipment in a thermal power plant boiler, comprising:

[0007] Feed hopper, pretreatment mechanism, grinding mechanism, and anti-clogging mechanism;

[0008] The pretreatment mechanism is located at the top of the feeding hopper and communicates with the inside of the feeding hopper. The pretreatment mechanism crushes the material by extrusion.

[0009] The grinding mechanism is located inside the feeding hopper, and the grinding mechanism performs secondary crushing of the material by rotation;

[0010] The anti-clogging mechanism is located outside the feed hopper and communicates with the inside of the feed hopper; the connection point between the anti-clogging mechanism and the feed hopper is lower than the connection point between the grinding mechanism and the feed hopper;

[0011] The anti-clogging mechanism introduces airflow to fluidize and clear the material in the feed hopper, allowing the material to fall smoothly under the action of gravity and airflow.

[0012] In another aspect of the present invention, preferably, the pretreatment mechanism includes a housing, a first drive assembly, and a crushing roller;

[0013] The outer shell is connected to the feed hopper, the crushing roller is disposed inside the outer shell, the first drive assembly is disposed outside the outer shell, the first drive assembly is connected to the crushing roller, the crushing roller is configured as a pair, the pair of crushing rollers are arranged in parallel, and the first drive assembly drives the pair of crushing rollers to rotate in opposite directions to squeeze and crush the material.

[0014] In another aspect of the present invention, preferably, the first drive assembly includes a reducer and a first motor, the crushing roller, the reducer and the first motor are connected in sequence, and the first motor is connected to the reducer via a coupling.

[0015] In another aspect of the present invention, preferably, the grinding mechanism includes a filter screen and a grinding component, the grinding component is disposed on the filter screen, one end of the grinding component is rotatably connected to the center of the filter screen, and the grinding component performs secondary crushing of the material by rotating around the connection point with the filter screen.

[0016] In another aspect of the present invention, preferably, the grinding assembly includes a second motor and a grinding roller, the second motor is disposed at the bottom of the filter screen, the grinding roller is disposed at the top of the filter screen, one end of the grinding roller is rotatably connected to the center of the filter screen, the second motor and the grinding roller are connected, and the second motor drives the grinding roller to rotate to perform secondary crushing of the material.

[0017] In another aspect of the present invention, preferably, the grinding assembly further includes a connecting column and a mounting frame; the connecting column passes through the filter screen, the connecting column is connected to the mounting frame, the second motor is connected to the grinding roller through the connecting column and the mounting frame, and the mounting frame is connected to the grinding roller through a bearing, so that the grinding roller rotates along one end while rotating itself.

[0018] In another aspect of the present invention, preferably, the anti-clogging mechanism includes an annular pipe and a nozzle, the annular pipe being connected to the nozzle, the annular pipe being disposed on the outer wall of the feed hopper, and the nozzle being connected to the feed hopper. Gas enters the interior of the feed hopper through the annular pipe and the nozzle to fluidize and clear the material in the feed hopper, allowing the material to fall smoothly under the action of gravity and airflow.

[0019] In another aspect of the present invention, preferably, the anti-clogging mechanism further includes a connecting pipe and a solenoid valve, the connecting pipe being connected to the annular pipe and to an external air source, and the solenoid valve being connected to the connecting pipe for controlling the opening and closing of the connecting pipe.

[0020] In another aspect, preferably, the invention further includes a connecting block, through which the annular tube is connected to the outer wall of the feed hopper.

[0021] In another aspect, preferably, the invention further includes a flange and a feed pipe; the feed pipe is connected to the bottom of the feed hopper via the flange.

[0022] (III) Beneficial Effects

[0023] The above-described technical solution of the present invention has the following beneficial technical effects:

[0024] This invention utilizes a pre-treatment mechanism installed at the top of the feed hopper to crush the incoming raw coal, effectively breaking down large pieces of coal and inclusions, preventing large particles from directly entering the coal mill, reducing grinding load and wear, and extending equipment lifespan. The grinding mechanism, located inside the feed hopper, performs secondary crushing of the material through rotation, resulting in a more uniform coal particle size distribution. This promotes complete and stable combustion in the boiler, improves combustion efficiency, and reduces energy consumption and pollution caused by incomplete combustion. An anti-clogging mechanism, located outside the feed hopper and connected at a low level, introduces airflow to fluidize and clear the material within the feed hopper, effectively preventing uneven feeding and accumulation at the bottom of the hopper and in the pipelines. This reduces the risk of blockage at the source and allows for online unblocking without shutting down the system, minimizing downtime and labor intensity caused by blockage removal, and improving the system's continuous operation capability. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present invention;

[0026] Figure 2 This is a side view of the overall structure of an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the grinding mechanism according to an embodiment of the present invention;

[0028] Figure 4This is a cross-sectional view of the outer casing according to an embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of the structure of a filter screen according to an embodiment of the present invention;

[0030] Figure label:

[0031] 1. Feed hopper; 2. Pre-treatment mechanism; 21. Outer shell; 22. Reducer; 23. First motor; 24. Crushing roller; 3. Grinding mechanism; 31. Filter screen; 32. Second motor; 33. Connecting column; 34. Mounting frame; 35. Grinding roller; 4. Anti-clogging mechanism; 41. Annular pipe; 42. Spray pipe; 43. Connecting pipe; 44. Solenoid valve; 5. Connecting block; 6. Flange; 7. Discharge pipe. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0033] The accompanying drawings show structural schematic diagrams according to embodiments of the present invention. These drawings are not drawn to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0034] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0035] In the description of this invention, it should be noted that the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] The invention will now be described in more detail with reference to the accompanying drawings. In the various drawings, the same elements are indicated by similar reference numerals. For clarity, the various parts in the drawings are not drawn to scale.

[0038] Example 1

[0039] A structure for the feed pipe of a coal mill, an auxiliary machine for a boiler in a thermal power plant. Figure 1 A schematic diagram of the overall structure of one embodiment of the present invention is shown; Figure 2 A side view of the overall structure of an embodiment of the present invention is shown; as follows: Figure 1 and Figure 2 As shown, it includes:

[0040] The system comprises a feed hopper 1, a pretreatment mechanism 2, a grinding mechanism 3, and an anti-clogging mechanism 4. The feed hopper 1 is a vertically arranged cylindrical or square hopper, its top connected to the pretreatment mechanism 2 and its bottom connected to the coal mill feed pipe. It is used to temporarily store and buffer raw coal or other materials requiring grinding from upstream conveying equipment, such as belt conveyors or bucket elevators. The volume of the feed hopper is determined based on the boiler coal consumption and the coal mill's processing capacity. It generally uses wear-resistant lining plates for the inner wall to reduce wear on the hopper wall caused by material impact and friction.

[0041] The pretreatment mechanism 2 is located at the top of the feed hopper 1 and communicates with the interior of the feed hopper 1. The pretreatment mechanism 2 crushes materials by extrusion. Located at the top of the feed hopper 1, the pretreatment mechanism 2 has an internal extrusion and crushing component that breaks larger coal lumps or agglomerated materials into smaller particles, preventing large pieces of material from directly entering the grinding mechanism 3 and causing excessive load or blockage. The lower part of the pretreatment mechanism has a discharge port that communicates with the interior of the feed hopper 1, allowing the pre-crushed material to fall freely into the feed hopper.

[0042] The grinding mechanism 3 is located inside the feed hopper 1. The grinding mechanism 3 performs secondary crushing of the material through rotation. The grinding mechanism 3 is arranged in the upper middle part of the feed hopper 1, and its main body is a rotary crushing unit. The rotor rotates at high speed around its own axis under the drive of a motor. The material is further refined under the impact, shearing, and friction of the rotor, thus achieving secondary crushing. The grinding mechanism can effectively reduce the particle size of coal, improve the grinding efficiency of subsequent coal mills, and reduce the internal load of the coal mill. The connection between the grinding mechanism and the feed hopper 1 is higher than the connection between the anti-clogging mechanism 4 and the feed hopper 1, so that the crushed material flows naturally downwards under gravity.

[0043] The anti-clogging mechanism 4 is located outside the feed hopper 1 and communicates with the interior of the feed hopper 1. The connection point between the anti-clogging mechanism 4 and the feed hopper 1 is lower than the connection point between the grinding mechanism 3 and the feed hopper 1. The anti-clogging mechanism 4 is installed on the lower outer side of the feed hopper 1 and is connected to the interior of the feed hopper 1 through a connecting pipe. Its connection position with the feed hopper is lower than the connection position between the grinding mechanism 3 and the feed hopper 1, so that it can directly intervene in the lower material when material sedimentation or poor flow occurs.

[0044] The anti-clogging mechanism 4 fluidizes and clears the material in the feed hopper 1 by introducing airflow, allowing the material to fall smoothly under the combined action of gravity and airflow. An airflow generating device, such as a blower or compressed air injection device, injects high-speed airflow into the bottom or side wall of the feed hopper 1 to fluidize and clear the material inside. The airflow disrupts the bridging and arching structures between material particles, causing the material to fall rapidly under the combined action of gravity and airflow, thereby preventing blockage at the discharge port and material retention.

[0045] In this embodiment, further, Figure 4 This is a cross-sectional view of the outer casing of an embodiment of the present invention, as shown below. Figure 4 As shown, the pretreatment mechanism 2 includes a housing 21, a first drive assembly, and a crushing roller 24. The housing 21 is welded from steel plate and has an internal working cavity for accommodating the crushing roller 24. A material inlet is located at the top of the housing 21, connecting to the outlet of the upstream conveying equipment, and a material outlet is located at the bottom, connecting to the upper end of the feed hopper 1 to ensure that the material smoothly enters the feed hopper under gravity. Mounting seats are located at both ends of the housing 21 to support the shaft ends of the crushing roller 24, and low-friction rotation is achieved through bearings. Simultaneously, to prevent dust overflow and reduce noise, a sealing ring is provided at the gap between the housing 21 and the crushing roller 24. The sealing ring can be made of wear-resistant rubber or high-temperature resistant polymer material.

[0046] The outer casing 21 is connected to the feed hopper 1. The crushing roller 24 is disposed inside the outer casing 21, and the first drive assembly is disposed outside the outer casing 21 and connected to the crushing roller 24. The crushing roller 24 is configured as a pair, arranged in parallel. The first drive assembly drives the pair of crushing rollers 24 to rotate in opposite directions to crush the material. The crushing rollers 24 are configured as a pair, arranged in parallel in the horizontal direction, forming a certain roller gap between the roller surfaces. The roller gap width can be adjusted according to the material particle size requirements. The adjustment method includes setting an eccentric bushing or a screw adjustment mechanism at the mounting base. When the pair of crushing rollers 24 are working, they rotate in opposite directions, so that the material entering the roller gap is subjected to extrusion and shearing forces, thereby being crushed into smaller particles. The roller surface of the crushing roller can be selected with different surface structures according to the working conditions, such as smooth roller surface, toothed roller surface, or wear-resistant liner roller surface, to improve crushing efficiency and extend service life.

[0047] The first drive assembly includes a reducer 22 and a first motor 23. The crushing roller 24, reducer 22, and first motor 23 are connected in sequence. The first motor 23 is connected to the reducer 22 via a coupling. The first motor can be a three-phase asynchronous motor or a frequency converter motor, capable of providing stable drive torque. The first motor 23 is connected to the input shaft of the reducer 22 via a coupling. The coupling can be a flexible pin coupling or a gear coupling to compensate for slight coaxiality deviations and absorb impact loads. The reducer 22 is used to convert the high-speed output of the first motor into the low-speed, high-torque output required by the crushing roller. It can be a hardened helical gear or a cycloidal pinwheel reducer to ensure smooth transmission, low noise, and high load-bearing capacity. The output shaft of the reducer 22 is connected to the shaft end of one of the crushing rollers 24 via a coupling, driving the crushing roller to rotate. The other crushing roller 24 rotates synchronously in the opposite direction to the first crushing roller 24 via gear transmission or chain transmission, realizing the two rollers moving towards each other. The material enters from the feed port at the top of the outer casing 21 and falls into the gap between the two crushing rollers 24. The first motor 23 starts and drives the active crushing roller to rotate through the reducer 22 and coupling, while simultaneously driving the driven crushing roller to rotate in the opposite direction. The material is subjected to strong compression and shearing between the two rollers. After large pieces of material are crushed into particles of the required size, they fall into the feed hopper 1 from the bottom outlet of the outer shell 21.

[0048] In this embodiment, further, Figure 3 A schematic diagram of the grinding mechanism according to an embodiment of the present invention is shown; Figure 5 A schematic diagram of the structure of a filter screen according to an embodiment of the present invention is shown; as follows: Figure 3 and Figure 5 As shown, the grinding mechanism 3 includes a filter screen 31 and a grinding assembly. The grinding assembly is disposed on the filter screen 31, and one end of the grinding assembly is rotatably connected to the center of the filter screen 31. The grinding assembly performs secondary crushing of the material by rotating around the connection point with the filter screen 31. The filter screen 31 has an annular or disc-shaped structure, and its outer edge is fixed to the inner wall of the feed hopper 1 to form a stable support. The filter screen 31 is made of high-strength wear-resistant metal wire mesh, perforated steel plate, or composite wear-resistant material to withstand material impact and long-term friction. The aperture of the filter screen is determined according to the feed particle size required by the subsequent coal mill.

[0049] The grinding assembly includes a second motor 32 and a grinding roller 35. The second motor 32 is located at the bottom of the filter screen 31, and the grinding roller 35 is located at the top of the filter screen 31. One end of the grinding roller 35 is rotatably connected to the center of the filter screen 31. The second motor 32 and the grinding roller 35 are connected, and the second motor 32 drives the grinding roller 35 to rotate for secondary crushing of the material. The second motor 32, located at the bottom of the filter screen 31, provides rotational power to the grinding roller 35. The second motor can be a three-phase asynchronous motor or a variable frequency speed control motor, which can achieve constant speed drive or adjust the speed according to the hardness and particle size of the material. For ease of maintenance and heat dissipation, the second motor 32 is fixed to the support structure below the filter screen 31 by a flange seat or mounting base plate, and is equipped with a dust cover or sealed housing to prevent dust and fine materials from entering the motor and causing damage. The grinding roller 35 is located at the top of the filter screen 31 and is in direct contact with the material for secondary crushing of large particles. One end of the grinding roller 35 is fixed to the center of the filter screen 31 via a rotating connector, enabling it to revolve around that end. The outer surface of the grinding roller can be designed as a smooth roller surface, a raised stripe roller surface, or a multi-tooth roller surface, with different structures selected according to the material characteristics to improve grinding efficiency. The preferred material for the grinding roller is high-manganese steel, wear-resistant alloy steel, or ceramic composite material to ensure long-term wear resistance and impact resistance.

[0050] The grinding assembly also includes a connecting column 33 and a mounting frame 34. The connecting column 33 penetrates the filter screen 31 and is connected to the mounting frame 34. The second motor 32 is connected to the grinding roller 35 via the connecting column 33 and the mounting frame 34. The mounting frame 34 is connected to the grinding roller 35 via a bearing, allowing the grinding roller 35 to rotate along one end while rotating itself. The connecting column 33 penetrates the filter screen 31 vertically, connecting the second motor 32 located below the filter screen to the grinding roller 35 above. The lower end of the connecting column is fixedly connected to the output shaft of the second motor 32 via a coupling, and the upper end is connected to the mounting frame 34. A protective sleeve may be provided on the surface of the connecting column to prevent dust from falling into the bearing area, and lubrication channels may be arranged inside the sleeve to ensure long-term stable operation of the rotating components. The mounting frame 34 is fixed to the upper end of the connecting column 33, located above the filter screen 31, and is used to support the grinding roller 35. The mounting frame 34 is connected to the grinding roller 35 via bearings, which can be deep groove ball bearings or cylindrical roller bearings. This ensures the stability of the grinding roller during its revolution and allows it to rotate on its own axis. The mounting frame 34 can be designed as a ring or fork structure to provide sufficient space for material flow during the grinding roller's revolution. During operation, the second motor 32 starts, driving its output shaft to rotate the connecting column 33. The connecting column 33, through the mounting frame 34, drives one end of the grinding roller 35 to revolve around the center of the filter screen 31. Simultaneously, due to the bearings, the grinding roller 35 can rotate on its own axis. Thus, under the superimposed motion of revolution and rotation, the grinding roller 35 not only continuously rolls and grinds the material on the screen surface but also continuously changes the area of ​​contact with the material, avoiding localized wear and improving the uniformity of crushing. Large particles are crushed into smaller particles under repeated compression and shearing.

[0051] Furthermore, in this embodiment, the anti-clogging mechanism 4 includes an annular pipe 41 and a nozzle 42. The annular pipe 41 is connected to the nozzle 42. The annular pipe 41 is disposed on the outer wall of the feed hopper 1, and the nozzle 42 is connected to the feed hopper 1. Gas enters the interior of the feed hopper 1 through the annular pipe 41 and the nozzle 42, fluidizing and clearing the material in the feed hopper 1, allowing the material to fall smoothly under the action of gravity and airflow. The annular pipe 41 is arranged in a ring shape along the outer wall of the feed hopper 1, and its inner diameter matches the outer diameter of the feed hopper 1. It can be fixed to the outer wall of the feed hopper by a bracket or clamp. The annular pipe is made of pressure-resistant and corrosion-resistant metal pipe or high-strength wear-resistant plastic pipe to ensure that it will not deform or wear under the long-term action of high-pressure airflow. One end of the nozzle 42 is connected to the annular pipe 41, and the other end passes through the outer wall of the feed hopper 1 and communicates with its interior. The nozzles can be arranged circumferentially or obliquely along the feed hopper, with the nozzles facing areas prone to material accumulation and clogging, such as the lower part of the hopper wall or above the discharge port. The spray angle and number of nozzles can be adjusted according to the material flow characteristics to ensure that the airflow can effectively break up the adhesion and bridging structures between materials. The nozzles 42 can be made of smooth-walled metal tubes, and wear-resistant nozzles can be added to the outlet end to extend their service life. In this embodiment, six nozzles 42 are used, all distributed on the outer wall of the feed hopper 1.

[0052] The anti-clogging mechanism 4 further includes a connecting pipe 43 and a solenoid valve 44. The connecting pipe 43 is connected to the annular pipe 41 and to an external air source. The solenoid valve 44 is connected to the connecting pipe 43 and is used to control the opening and closing of the connecting pipe 43. One end of the connecting pipe 43 is connected to the annular pipe 41, and the other end is connected to an external air source, which can be a high-pressure airflow provided by a compressed air system or a blower. The connecting pipe 43 is made of pressure-resistant tubing of the same or higher strength as the annular pipe and is securely connected to the annular pipe 41 via flanges, threads, or quick couplings to ensure no leakage occurs under high pressure. The solenoid valve 44 is installed on the connecting pipe 43 and is used to control the airflow between the external air source and the annular pipe 41. The solenoid valve can be controlled by a PLC or automatic control system, or it can be equipped with a manual switch to achieve automatic or manual operation.

[0053] Furthermore, in this embodiment, a connecting block 5 is also included, through which the annular pipe 41 is connected to the outer wall of the feed hopper 1. The connecting block 5 is made of high-strength metal material, such as carbon steel or stainless steel, capable of withstanding the high-pressure airflow inside the annular pipe 41 and the vibration generated during operation. The structure of the connecting block 5 can be boss-shaped, U-shaped, or L-shaped, with mounting screw holes or slots inside to securely fix the annular pipe 41, and reliably connected to the outer wall of the feed hopper 1 by bolts, nuts, or welding. With the support of the connecting block 5, the annular pipe 41 maintains a stable shape surrounding the outer wall of the feed hopper, ensuring that the airflow is evenly distributed to each nozzle 42, and avoiding a reduction in the anti-clogging effect due to pipe displacement or vibration.

[0054] Furthermore, this embodiment also includes a flange 6 and a discharge pipe 7; the discharge pipe 7 is connected to the bottom of the feed hopper 1 via the flange 6. The discharge pipe 7 is used to connect the feed hopper 1 to the downstream conveying system or the coal mill. The discharge pipe 7 is connected to the bottom of the feed hopper 1 via the flange 6, which is made of round or square steel plate and has evenly distributed bolt holes. Through bolt connection or sealing gaskets, the flange 6 can ensure a reliable seal at the interface between the discharge pipe 7 and the feed hopper 1, preventing dust leakage. The discharge pipe 7 has a conical pipe structure and is made of wear-resistant carbon steel, stainless steel, or wear-resistant alloy. The pipe diameter is designed according to the size of the coal mill inlet and the material flow rate to ensure that the material falls smoothly under gravity, reducing blockage and wear. The length and inclination angle of the discharge pipe 7 can be adjusted according to the actual installation conditions to ensure smooth connection with downstream equipment and reduce the impact and wear of the material during the conveying process.

[0055] Furthermore, the method of using the feed pipe structure of the coal mill, an auxiliary equipment of a thermal power plant boiler, in this embodiment includes:

[0056] S100, Raw coal pretreatment: Start the first motor 23, which drives the two crushing rollers 24 to rotate in opposite directions through the reducer 22. The raw coal enters the pretreatment mechanism 2 from the top of the outer shell 21, and after being squeezed and sheared by the crushing rollers 24, it falls into the feed hopper through the connection between the bottom of the outer shell 21 and the top of the feed hopper 1.

[0057] S200, initial particle size screening: the pre-treated raw coal falls onto the filter screen 31. Particles that meet the particle size requirements pass through the screen holes and enter the lower part of the feed hopper 1, while larger particles are intercepted on the screen surface.

[0058] S300, Secondary grinding process: Start the second motor 32 to drive the connecting column 33, mounting frame 34 and grinding roller 35 to rotate. The grinding roller 35 grinds the large particles of raw coal on the filter screen 31 until the particle size meets the standard and falls through the screen holes.

[0059] S400, Initialize the anti-clogging system. Fix the annular pipe 41 to the outside of the bottom of the feed hopper 1 through the connecting block 5. Connect the connecting pipe 43 to an external air source (such as a compressed air pipeline) and check whether the solenoid valve 44 is closed normally.

[0060] S500, feeding and continuous monitoring: raw coal enters the coal mill through flange 6 and discharge pipe 7, and the material flow in the feed hopper 1 is observed in real time to avoid accumulation.

[0061] S600 Anti-clogging airflow purging: When material accumulation is found in the feed hopper 1, the solenoid valve 44 is opened, and the air source enters the annular pipe 41 through the connecting pipe 43. The airflow is sprayed into the hopper by 6 circumferentially distributed nozzles 42 to purge the accumulated material and restore its flow.

[0062] S700 Equipment maintenance and disassembly: When disassembly is required, loosen the flange 6 bolts and separate the feed hopper 1 from the discharge pipe 7; remove the fasteners of the reducer 22 to inspect the crushing roller 24 and the pretreatment mechanism 2.

[0063] S800, sequentially shut down the second motor 32, the first motor 23, and finally close the solenoid valve 44 to cut off the air supply, completing the feeding operation.

[0064] This embodiment incorporates a pre-treatment mechanism at the top of the feed hopper to crush the incoming raw coal, effectively breaking down large pieces of coal and inclusions. This prevents large particles from directly entering the coal mill, reducing grinding load and wear, and extending equipment lifespan. The grinding mechanism, located inside the feed hopper, performs secondary crushing of the material through rotation, resulting in a more uniform coal particle size distribution. This promotes complete and stable combustion in the boiler, improves combustion efficiency, and reduces energy consumption and pollution from incomplete combustion. An anti-clogging mechanism, located outside the feed hopper and connected at a low level, introduces airflow to fluidize and clear the material within the feed hopper. This effectively prevents uneven feeding and accumulation at the bottom of the hopper and in the pipelines, reducing the risk of blockage at the source. Online clearing can be performed without shutting down the system, minimizing downtime and labor intensity caused by blockage removal, and improving the system's continuous operation capability.

[0065] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of the invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the invention should be included within the protection scope of the invention. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

[0066] The above description does not provide detailed explanations of the technical aspects of each layer's patterning and etching. However, those skilled in the art should understand that various methods existing in the prior art can be used to form layers and regions of the desired shape. Furthermore, to form the same structure, those skilled in the art can also design methods that are not entirely identical to those described above.

[0067] The present invention has been described above with reference to embodiments thereof. However, these embodiments are merely illustrative and not intended to limit the scope of the invention. The scope of the invention is defined by the appended claims and their equivalents. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of the invention, and all such substitutions and modifications should fall within the scope of the invention.

[0068] Although embodiments of the present invention have been described in detail, it should be understood that various changes, substitutions, and modifications can be made to the embodiments of the present invention without departing from the spirit and scope of the invention.

[0069] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A structure for the feed pipe of a coal mill, an auxiliary machine in a thermal power plant boiler, characterized in that, include: Feeding hopper (1), pretreatment mechanism (2), grinding mechanism (3) and anti-clogging mechanism (4); The pretreatment mechanism (2) is located at the top of the feeding hopper (1) and communicates with the inside of the feeding hopper (1). The pretreatment mechanism (2) crushes the material by squeezing. The grinding mechanism (3) is located inside the feeding bin (1), and the grinding mechanism (3) performs secondary crushing of the material by rotation; The anti-clogging mechanism (4) is located outside the feed hopper (1) and communicates with the inside of the feed hopper (1); the connection between the anti-clogging mechanism (4) and the feed hopper (1) is lower than the connection between the grinding mechanism (3) and the feed hopper (1); The anti-blocking mechanism (4) introduces airflow to fluidize and clear the material in the feed bin (1), so that the material falls smoothly under the action of gravity and airflow.

2. The feed pipe structure of the coal mill, an auxiliary equipment of a thermal power plant boiler, according to claim 1, is characterized in that... The pretreatment mechanism (2) includes a housing (21), a first drive assembly, and a crushing roller (24); The outer shell (21) is connected to the feed bin (1), the crushing roller (24) is disposed inside the outer shell (21), the first drive assembly is disposed outside the outer shell (21), the first drive assembly is connected to the crushing roller (24), the crushing roller (24) is configured as a pair, the pair of crushing rollers (24) are arranged in parallel, and the first drive assembly drives the pair of crushing rollers (24) to rotate and crush the material in opposite directions.

3. The feed pipe structure of the coal mill, an auxiliary machine for a thermal power plant boiler, according to claim 2, is characterized in that... The first drive assembly includes a reducer (22) and a first motor (23). The crushing roller (24), the reducer (22) and the first motor (23) are connected in sequence. The first motor (23) is connected to the reducer (22) through a coupling.

4. The feed pipe structure of the coal mill, an auxiliary machine for a thermal power plant boiler, according to claim 3, is characterized in that... The grinding mechanism (3) includes a filter screen (31) and a grinding component. The grinding component is disposed on the filter screen (31). One end of the grinding component is rotatably connected to the center of the filter screen (31). The grinding component performs secondary crushing of the material by rotating around the connection point with the filter screen (31).

5. The feed pipe structure of the coal mill, an auxiliary machine for a thermal power plant boiler, according to claim 4, is characterized in that... The grinding assembly includes a second motor (32) and a grinding roller (35). The second motor (32) is located at the bottom of the filter screen (31), and the grinding roller (35) is located at the top of the filter screen (31). One end of the grinding roller (35) is rotatably connected to the center of the filter screen (31). The second motor (32) and the grinding roller (35) are connected. The second motor (32) drives the grinding roller (35) to rotate to perform secondary crushing of the material.

6. The feed pipe structure of the coal mill, an auxiliary equipment of a thermal power plant boiler, according to claim 5, is characterized in that... The grinding assembly also includes a connecting column (33) and a mounting frame (34); the connecting column (33) passes through the filter screen (31), the connecting column (33) is connected to the mounting frame (34), the second motor (32) is connected to the grinding roller (35) through the connecting column (33) and the mounting frame (34), and the mounting frame (34) is connected to the grinding roller (35) through a bearing, so that the grinding roller (35) rotates along one end while rotating along itself.

7. The feed pipe structure of the coal mill, an auxiliary machine for a thermal power plant boiler, according to claim 1, is characterized in that... The anti-clogging mechanism (4) includes an annular pipe (41) and a nozzle (42). The annular pipe (41) is connected to the nozzle (42). The annular pipe (41) is located on the outer wall of the feed hopper (1). The nozzle (42) is connected to the feed hopper (1). Gas enters the feed hopper (1) through the annular pipe (41) and the nozzle (42) to fluidize and clear the material in the feed hopper (1), so that the material falls smoothly under the action of gravity and airflow.

8. The feed pipe structure of the coal mill, an auxiliary equipment of a thermal power plant boiler, according to claim 7, is characterized in that... The anti-clogging mechanism (4) also includes a connecting pipe (43) and a solenoid valve (44). The connecting pipe (43) is connected to the annular pipe (41) and to an external air source. The solenoid valve (44) is connected to the connecting pipe (43) and is used to control the opening and closing of the connecting pipe (43).

9. The feed pipe structure of the coal mill, an auxiliary equipment of a thermal power plant boiler, according to claim 8, is characterized in that... It also includes a connecting block (5), through which the annular pipe (41) is connected to the outer wall of the feed hopper (1).

10. The feed pipe structure of the coal mill, an auxiliary equipment of a boiler in a thermal power plant, according to claim 1, is characterized in that... It also includes a flange (6) and a feed pipe (7); the feed pipe (7) is connected to the bottom of the feed hopper (1) through the flange (6).

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