Boiler fuel handling system
By using an auger connector, drum screen, and water spray structure in the boiler fuel handling system, the problem of poor boiler fuel handling effect is solved, enabling flexible adjustment of coal particle size and stable combustion, reducing resource waste and boiler damage.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 博乐汗腾生物科技有限公司
- Filing Date
- 2025-08-19
- Publication Date
- 2026-07-21
AI Technical Summary
Existing boilers are ineffective in processing coal and cannot adjust the size of coal particles according to combustion needs, resulting in resource waste and uneven heat distribution inside the boiler.
The system uses a connecting seat with an auger to connect to the feed pipe at the bottom of the temporary funnel. Combined with a drum-shaped screening cylinder and a water spray structure, it achieves coal screening and humidification treatment, ensuring that the coal particle size meets the combustion requirements. The screening capacity is adjusted through a sealed cylinder.
It improves the stability of coal transportation and combustion, reduces resource consumption, ensures uniform heat distribution inside the boiler, and avoids coal dust waste and grate damage.
Smart Images
Figure CN224534296U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of coal processing technology, and in particular to a boiler fuel processing system. Background Technology
[0002] Traditional technologies often face numerous challenges in the transportation of coal for boilers. First, large pieces of coal can easily impact the conveyor belt during transportation, which can not only damage the conveying equipment and increase maintenance costs, but also affect the transportation efficiency and even cause safety accidents. Second, the coal generates a large impact force during its descent, which poses a serious threat to the conveyor belt and subsequent equipment, and will significantly shorten the service life of the equipment in the long run.
[0003] Currently, a Chinese patent application with patent number "CN202510697773.8" discloses a coal conveying device for boilers, relating to the field of coal conveying technology. This device includes a conveyor frame, inside which are a buffer structure to reduce the impact force of falling coal, a coal conveying structure for transporting coal, and an iron conveying structure for transporting ferrous impurities. The buffer structure and the iron conveying structure are located above the coal conveying structure, with the buffer structure to the left of the iron conveying structure. A feed hopper is fixed to the upper left side of the conveyor frame, directly above the buffer structure, and a partition frame is fixed inside the feed hopper. While this device can prevent large pieces of coal from directly impacting the conveyor belt to some extent, after the coal is conveyed to the boiler, it enters above the grate, while air is transported upwards from below the grate. This causes coal dust to be blown away by the airflow below the grate, resulting in economic losses.
[0004] However, during the implementation of the above technical solution, at least the following technical problems were discovered:
[0005] The existing boilers suffer from poor fuel handling and an inability to adjust coal particle size according to combustion needs. During operation, coal is the most common fuel. After being delivered, the coal enters the grate, while air rises from below. Raw coal contains approximately 40% coal dust, some of which leaks to the bottom of the grate, while some is blown away by the airflow below, resulting in significant waste. Furthermore, the accumulation of coal dust below the grate leads to uneven heating, causing grate deformation and damage. Secondly, due to the varying particle size of the raw coal, it is typically screened before being fed into the boiler for uniform heat production. Smaller coal particles burn faster and generate more intense heat, while larger particles burn more slowly and produce more stable heat. Therefore, smaller coal particles are needed for rapid heating, while larger particles are required for maintaining temperature. However, existing screening structures can only screen one particle size, making adjustment impossible. Therefore, we propose a boiler fuel handling system. Utility Model Content
[0006] (a) Technical problems to be solved
[0007] In view of the shortcomings of the existing technology, this utility model provides a boiler fuel treatment system, which solves the technical problems of poor treatment effect and inability to adjust the coal particle size according to combustion needs when the existing boiler is working.
[0008] (II) Technical Solution
[0009] To achieve the above objectives, this utility model provides the following technical solution:
[0010] Boiler fuel handling system, the handling system including:
[0011] Temporary coal hoppers for storing raw coal and raw material coal hoppers for storing combustible coal blocks;
[0012] The conveyor belt, located between the temporary coal hopper and the raw coal hopper, can transport the screened raw coal to the raw coal hopper for storage.
[0013] A screening cylinder is installed at the position opposite to the temporary coal hopper of the conveyor belt. The screening cylinder can be rotated by a motor to screen the raw coal falling from the temporary coal hopper.
[0014] A water spray pipe is installed on the top of the raw coal hopper, through which water is sprayed onto the coal blocks stored inside the raw coal hopper.
[0015] Preferably, the temporary coal hopper is equipped with limit plates on its top three sides. Raw coal can be transported into the interior of the temporary coal hopper through the side without the limit plates. The discharge pipe at the bottom of the temporary coal hopper corresponds to the end of the conveyor belt, and a discharge assembly is installed at the end of the discharge pipe to transport the end of the conveyor belt containing the raw coal stored inside the discharge pipe.
[0016] Preferably, the feeding assembly includes a connecting seat that docks with the feeding pipe, and a spiral auger is inserted inside the connecting seat and driven to rotate by a drive motor on the outside of the connecting seat. During the rotation of the auger, the raw coal that has entered the connecting seat is conveyed outward.
[0017] The discharge port of the connecting seat corresponds vertically to the screening cylinder at the end of the conveyor belt.
[0018] Preferably, an extension cylinder is installed on the top of the connecting seat and is connected to the connecting seat. The auger is set in the extension cylinder, and one end of the auger is connected to the drive motor, while the other end extends to the outside of the connecting seat. When the auger is driven to rotate by the drive motor, the raw coal stored in the temporary coal hopper can be transported to the opening of the extension cylinder.
[0019] Preferably, the end of the screening cylinder closest to the conveyor belt is inclined upwards, and the end of the screening cylinder furthest from the conveyor belt extends to the outside of the conveyor belt;
[0020] When the raw coal comes into contact with the screening cylinder, small particles of raw coal pass through the screening cylinder and fall onto the conveyor belt; large particles of raw coal fall along the end of the screening cylinder away from the conveyor belt.
[0021] Preferably, a guide funnel is installed at the bottom of the temporary coal hopper, and the opening at the top of the guide funnel corresponds to the end of the extension cylinder. The discharge port of the guide funnel extends into the interior of the screening cylinder to transport raw coal into the interior of the screening cylinder.
[0022] Preferably, a central rod is installed at the center of the screening cylinder, and the central rod is connected to the inner wall of the screening cylinder through a connecting rod. One end of the central rod is connected to the guide funnel through a bearing, and the other end is connected to the support through a bearing. A connecting gear is connected to the end connected to the support, and the connecting gear is connected to the motor through a chain.
[0023] Preferably, the screening cylinder is divided into three sections of material distribution cylinder with different screen holes, and a sealing cylinder is fitted on the outside of the screening cylinder. The sealing cylinder can slide outside the screening cylinder, and the length of the sealing cylinder is the same as the length of each material distribution cylinder.
[0024] One method is to cover the outside of the distributing cylinder with a sliding sealing cylinder to block the screen holes on the surface of the distributing cylinder.
[0025] Preferably, a support frame is connected to the top of the raw coal hopper, and the water spray pipe is installed on the support frame, with the nozzle on the support frame facing the inside of the raw coal hopper;
[0026] The support frame is located at the end of the conveyor belt.
[0027] (III) Beneficial Effects
[0028] 1. By using a connecting seat with an auger and a feed pipe at the bottom of the temporary funnel, coal can be transported onto the conveyor belt at a constant speed, thus improving the stability of coal transportation. Secondly, a drum-shaped screening cylinder is installed at the position corresponding to the auger on the conveyor belt to screen the falling coal, thereby adjusting the particle size of the coal entering the boiler. Finally, the coal is transported by the conveyor belt to the raw coal hopper, where water is sprayed onto the coal from the nozzles above, increasing the moisture content of smaller and finer coal particles and causing them to stick together. Therefore, this effectively solves the technical problems of poor processing effect and inability to adjust the coal particle size according to combustion needs in existing boilers during operation. This achieves full processing of boiler fuel, enabling coal to burn more fully and stably, thereby reducing resource consumption while improving combustion stability, and has better application prospects.
[0029] 2. By dividing the screening cylinder into three sections with different surface aperture sizes, the raw coal can be screened to different degrees, thus classifying the raw coal. Secondly, a cylindrical sealing cylinder is installed outside the distribution cylinder to cover the outside of the distribution cylinder and block the holes on the surface of the distribution cylinder, thereby closing the corresponding distribution cylinder. This allows the distribution cylinders with different screening capacities to be freely rotated as needed, so as to control the addition of coal of different particle sizes according to combustion requirements, thereby improving the applicability of the device. Attached Figure Description
[0030] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.
[0031] Figure 1 This is an overall structural diagram of an embodiment of the present utility model;
[0032] Figure 2 This is a diagram showing the docking structure between the temporary coal hopper and the feeding assembly in an embodiment of this utility model;
[0033] Figure 3 This is a structural diagram of the feeding assembly in an embodiment of the present invention;
[0034] Figure 4 This is a diagram showing the connection structure between the conveyor belt and the screening cylinder in an embodiment of this utility model.
[0035] Figure 5 This is a schematic diagram of the screening process of the screening cylinder in an embodiment of this utility model;
[0036] Figure 6 This is a schematic diagram of the structure of the screening cylinder in an embodiment of the present invention;
[0037] Figure 7 This is a schematic diagram of the movement of the sealing cylinder in an embodiment of this utility model;
[0038] Figure 8 This is a schematic diagram of the connection between the raw coal hopper and the water spray structure in an embodiment of this utility model.
[0039] Legend:
[0040] 1. Conveyor belt; 11. Transport frame; 12. Rollers;
[0041] 2. Temporary coal hopper; 21. Limiting plate; 22. Feed pipe;
[0042] 3. Feeding assembly; 31. Connecting seat; 32. Screwdriver; 33. Extension cylinder; 34. Extension rod; 35. Drive motor; 36. Bearing housing;
[0043] 41. Screening cylinder; 42. Linking gear; 43. Gearbox; 44. Chain; 45. Center rod; 46. Guide funnel; 47. Support; 48. Sealing cylinder;
[0044] 51. Raw coal hopper; 52. Support frame; 53. Water spray pipe; 54. Sprayer head. Detailed Implementation
[0045] This application provides a boiler fuel processing system that effectively solves the technical problems of poor processing effect and inability to adjust coal particle size according to combustion needs in existing boilers. In existing boilers, the use of a connecting seat with an auger and a feed pipe at the bottom of a temporary funnel allows coal to be transported onto the conveyor belt at a constant speed, improving the stability of coal transport. Secondly, a drum-shaped screening cylinder is installed at the position corresponding to the auger on the conveyor belt to screen the falling coal, thereby adjusting the particle size of the coal entering the boiler. Finally, the coal is transported by the conveyor belt to the raw coal hopper, where water is sprayed onto the coal from nozzles above, increasing the moisture content of smaller and finer coal particles, causing them to adhere. This achieves thorough processing of the boiler fuel, enabling more complete and stable combustion, thus reducing resource consumption while improving combustion stability, and showing better application prospects.
[0046] Example: The technical solution in this application example effectively solves the technical problem that existing boilers have poor processing effect and cannot adjust the coal particle size according to combustion needs during operation. The overall idea is as follows:
[0047] To address the problems existing in the prior art, this utility model provides a boiler fuel processing system. This system mainly includes four stages: feeding, screening, conveying, and humidification. Feeding is achieved using an auger 32 as the conveying structure to evenly transport the raw coal from the temporary coal hopper 2 to meet the boiler's combustion requirements. Screening employs a perforated drum as the screening structure to sieve the raw coal, ensuring that the coal fed into the boiler meets the combustion requirements and preventing uneven heat distribution within the boiler due to uneven coal size (i.e., small particles). The larger the specific surface area of coal, the faster it burns after entering the boiler; conversely, large-particle coal burns slowly with little variation in heat production, resulting in uneven heat generation. A traditional belt conveyor is used to transport the screened coal to the raw coal hopper 51 for storage, for subsequent boiler combustion. Humidification involves adding water to the coal in the raw coal hopper 51 to increase the moisture content of smaller coal particles and finer coal, causing them to adhere and preventing coal dust from leaking under the grate or being blown away by the airflow below the grate, thus avoiding significant waste. The specific structure is as follows:
[0048] The feeding structure (i.e., feeding component 3) is located at the bottom of the temporary coal hopper 2 and is connected to the feeding pipe 22 at the bottom of the temporary coal hopper 2, such as... Figure 2 As shown, the raw coal stored in the temporary coal hopper 2 can be transported to the feeding structure through the feeding pipe 22 to facilitate the control of the subsequent feeding structure. In addition, to facilitate the loading of raw coal, limiting plates 21 are installed on only three sides of the temporary coal hopper 2. When the raw coal is poured into the temporary coal hopper 2, it can be transported into the temporary coal hopper 2 through this gap. At the same time, the limiting plates 21 in the other three directions can prevent the raw coal from falling out of the edge of the temporary coal hopper 2 during the pouring process.
[0049] The feeding structure mainly consists of a funnel-shaped connecting seat 31 and an auger 32 disposed inside the connecting seat 31, with one end of the auger 32 extending to the outside of the connecting seat 31, such as... Figure 2 and Figure 3 As shown, when the drive motor 35 rotates the auger 32, it pushes the raw coal stored in the temporary coal hopper 2 outwards. Since the edge of the auger 32 is in contact with the inner wall of the extension cylinder 33 at the bottom of the connecting seat 31, a closed space is formed between the auger 32 and the inner wall of the extension cylinder 33. This divides the raw coal conveyed by the auger 32 into fixed sizes, so the amount of raw coal fed can be controlled precisely by controlling the rotation speed of the auger 32. To facilitate stable conveying of raw coal, we use an auger 32 with an extension rod 34, such as... Figure 3 As shown, one end of the extension rod 34 is connected to the drive motor 35, and the other end extends to the outside of the connecting seat 31. A bearing seat 36 is installed on the end of the extension rod 34 that extends out of the extension cylinder 33. The bearing seat 36 is connected to the bottom of the temporary coal hopper 2. This can keep the auger 32 stable while supporting the extension rod 34. When the auger 32 is driven to rotate by the drive motor 35, the raw coal stored in the temporary coal hopper 2 can be transported to the opening of the extension cylinder 33.
[0050] The screening cylinder 41 is located at the end of the extension cylinder 33 so that the raw coal pushed down by the auger 32 can be accurately fed into the screening cylinder 41 for screening.
[0051] The screening structure uses a cylindrical screening cylinder 41 as the main body for screening raw coal. The end of the screening cylinder 41 closest to the conveyor belt 1 is inclined upwards, while the end furthest from the conveyor belt 1 extends to the outer side of the conveyor belt 1. This allows small particles of raw coal to pass through the screening cylinder 41 and fall onto the conveyor belt 1 when they come into contact with the raw coal; while larger particles fall along the screening cylinder 41 towards the outer side of the conveyor belt 1. Figure 4 and Figure 5 As shown, Figure 4As shown, the conveyor belt 1 is fitted onto the transport frame 11 and is in contact with the rollers 12 on the transport frame 11 to support the conveyor belt 1 and reduce friction.
[0052] like Figure 4 and Figure 5 As shown, to ensure a stable flow of raw coal into the screening cylinder 41, a guide funnel 46 is suspended from the bottom of the temporary coal hopper 2 via a connecting rod. The opening at the top of the guide funnel 46 corresponds to the end of the extension cylinder 33, serving to collect the raw coal falling from the extension cylinder 33. The discharge port of the guide funnel 46 extends into the interior of the screening cylinder 41, conveying the raw coal into the interior of the screening cylinder 41. Therefore, the raw coal falling from the temporary coal hopper 2 can be received and guided into the screening cylinder 41 for subsequent screening. Simultaneously, to ensure the stability of the screening cylinder 41's operation, such as... Figure 5 As shown, a central rod 45 is installed at the center of the screening cylinder 41, and the central rod 45 is connected to the inner wall of the screening cylinder 41 via a connecting rod, thereby fixing the screening cylinder 41 to the central rod 45. The central rod 45 rotates synchronously with the screening cylinder 41 and also provides support for the screening cylinder 41. One end of the central rod 45 is connected to the guide funnel 46 via a bearing (the connection between the guide funnel 46 and the temporary funnel 2 provides support for the end of the central rod 45), and the other end is connected to the bracket 47 via a bearing. Figure 4 As shown, this provides support for both ends of the central rod 45, and a connecting gear 42 is connected to one end of the rod connected to the bracket 47. The connecting gear 42 is connected to the gearbox 43 via the chain 44, and then connected to the motor via the gearbox 43. In this way, the motor can drive the connecting gear 42 via the chain 44, and then the connecting gear 42 transmits the power to the central rod 45 and the screening cylinder 41 connected to the central rod 45, thereby driving the screening cylinder 41 to rotate.
[0053] To better screen raw coal, which varies in size, screening is typically performed before it enters the boiler to ensure uniform heat production. Smaller coal particles burn faster and generate more intense heat, while larger particles burn more slowly and produce more stable heat. Therefore, smaller coal particles are needed for rapid heating, while larger particles are needed to maintain temperature for sustained heat retention. However, existing screening structures can only screen one size, making it impossible to adjust the size as needed. We have divided the screening cylinder 41 into three sections with different screen openings, with the screen openings gradually increasing in size from the end closest to the conveyor belt 1 to the end furthest away. Figure 6As shown, a cylindrical sealing cylinder 48 is fitted around the outside of the screening cylinder 41. The sealing cylinder 48 can slide outside the screening cylinder 41, and its length is the same as the length of each section of the distribution cylinder. When the sliding sealing cylinder 48 covers the outside of the distribution cylinder, it can block the screen holes on the surface of the distribution cylinder, thereby guiding the raw coal to be discharged through the screen holes of a specified size, thus enabling screening at different sizes. Figure 7 As shown, the sealing cylinder 48 can be slidably covered on different dispensing cylinders, and there are two sets of sealing cylinders 48.
[0054] The humidification structure and conveyor belt 1 transport the screened coal to the top of the raw material coal hopper 51, such as... Figure 1 As shown, the coal is stored in the raw coal hopper 51 for subsequent humidification treatment; specifically as follows:
[0055] A rectangular support frame 52 is erected on top of the raw coal hopper 51, and a water spray pipe 53 is installed on the support frame 52. The water spray pipe 53 is connected to a water source through a pipe, so water can be transported to the water spray pipe 53 through the pipe. Then, the nozzle 54 on the support frame 52 sprays the water towards the inside of the raw coal hopper 51, thereby humidifying the screened coal, increasing the moisture content of the smaller coal particles and fine coal, making them stick together, and thus achieving full treatment of boiler fuel, so that the coal can burn more fully and stably. This reduces resource loss and improves combustion stability. After the coal is transported to the boiler, it enters the grate. The air inside the grate is transported from below to above. The raw coal contains about 40% coal dust. After entering, some of the coal dust leaks to the bottom of the grate, and some is blown away by the air below the grate, causing serious waste. Moreover, the accumulation of coal dust under the grate will cause uneven heating of the grate, resulting in grate deformation and damage.
[0056] In the specific implementation process, raw coal is poured into the temporary coal hopper 2 through the notch of the top limiting plate 21. At the same time, the limiting plates 21 in the other three directions can prevent the raw coal from falling out of the edge of the temporary coal hopper 2 during the pouring process. The raw coal gathers in the temporary coal hopper 2 and then falls into the connecting seat 31 under the action of gravity. When the drive motor 35 drives the auger 32 to rotate, it can push the raw coal stored in the temporary coal hopper 2 outward. Since the edge of the auger 32 is in contact with the inner wall of the extension cylinder 33 at the bottom of the connecting seat 31, a closed space is formed between the auger 32 and the inner wall of the extension cylinder 33. Thus, the raw coal conveyed by the auger 32 is divided into fixed sizes. Therefore, the amount of raw coal fed can be controlled by controlling the rotation speed of the auger 32, thereby achieving precise control.
[0057] After being conveyed by the screw conveyor 32, the raw coal falls into the guide funnel 46 and is then transported along the discharge port of the guide funnel 46 into the interior of the screening cylinder 41. Thus, the raw coal falling from the temporary coal hopper 2 can be received and guided into the screening cylinder 41 for subsequent screening of the raw coal by the screening cylinder 41.
[0058] During screening, a sealing cylinder 48, which is slidably fitted outside the screening cylinder 41 according to the required coal particle size, covers the outside of different distribution cylinders. This blocks the screen holes on the surface of the distribution cylinders, thereby guiding the raw coal to be discharged through the screen holes of the specified size, thus performing screening of different sizes, such as... Figure 7 As shown;
[0059] A cylindrical screening cylinder 41 is used as the main body for screening raw coal. The end of the screening cylinder 41 closest to the conveyor belt 1 is inclined upwards, and the end of the screening cylinder 41 furthest from the conveyor belt 1 extends to the outer side of the conveyor belt 1. Thus, when the raw coal comes into contact with the screening cylinder 41, small particles of raw coal pass through the screening cylinder 41 and fall onto the conveyor belt 1; while large particles of raw coal fall along the screening cylinder 41 to the outer side of the conveyor belt 1. Figure 4 and Figure 5 As shown.
[0060] The screened coal enters the top of the raw coal hopper 51 along the conveyor belt 1, as shown below. Figure 1 As shown, coal is stored in the raw coal hopper 51 for subsequent humidification. Water is transported through pipes to the water spray pipe 53, and then sprayed into the raw coal hopper 51 by the nozzles 54 on the support frame 52. This humidifies the screened coal, increases the moisture content of smaller coal particles and fine coal, causing them to stick together. This achieves full treatment of boiler fuel, enabling the coal to burn more fully and stably.
[0061] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications 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 protection scope of this invention.
Claims
1. A boiler fuel handling system, characterized in that, The processing system includes: Temporary coal hopper (2) for storing raw coal and raw material coal hopper (51) for storing combustible coal blocks. The conveyor belt (1) is set between the temporary coal hopper (2) and the raw coal hopper (51) to transport the screened raw coal to the raw coal hopper (51) for storage. Among them, a screening cylinder (41) is provided at the position opposite to the temporary coal hopper (2) of the conveyor belt (1). The screening cylinder (41) can be rotated by a motor to screen the raw coal falling from the temporary coal hopper (2). A water spray pipe (53) is installed on the top of the raw coal hopper (51) to spray water onto the coal blocks stored inside the raw coal hopper (51).
2. The boiler fuel handling system as described in claim 1, characterized in that: The temporary coal hopper (2) is equipped with limit plates (21) on its top three sides. Raw coal can be transported into the interior of the temporary coal hopper (2) through the side without limit plates (21). The discharge pipe (22) at the bottom of the temporary coal hopper (2) corresponds to the end of the conveyor belt (1). A discharge assembly (3) is installed at the end of the discharge pipe (22) to transport the raw coal stored inside the discharge pipe (22) to the end of the conveyor belt (1).
3. The boiler fuel handling system as described in claim 2, characterized in that: The feeding assembly (3) includes a connecting seat (31) that docks with the feeding pipe (22), and a spiral auger (32) is inserted inside the connecting seat (31), and is driven to rotate by a drive motor (35) on the outside of the connecting seat (31). During the rotation of the auger (32), the raw coal that has entered the connecting seat (31) is transported outward. The discharge port of the connecting seat (31) corresponds vertically to the screening cylinder (41) at the end of the conveyor belt (1).
4. The boiler fuel handling system as described in claim 3, characterized in that: An extension cylinder (33) is installed on the top of the connecting seat (31), and the extension cylinder (33) is connected to the connecting seat (31). The auger (32) is set in the extension cylinder (33), and one end of the auger (32) is connected to the drive motor (35), and the other end extends to the outside of the connecting seat (31). When the auger (32) is driven to rotate by the drive motor (35), the raw coal stored in the temporary coal hopper (2) can be transported to the opening of the extension cylinder (33).
5. The boiler fuel handling system as described in claim 1, characterized in that: The end of the screening cylinder (41) near the conveyor belt (1) is inclined upward, and the end of the screening cylinder (41) away from the conveyor belt (1) extends to the outside of the conveyor belt (1); When the raw coal comes into contact with the screening cylinder (41), small particles of raw coal pass through the screening cylinder (41) and fall onto the conveyor belt (1); large particles of raw coal fall along the end of the screening cylinder (41) away from the conveyor belt (1).
6. The boiler fuel handling system as described in claim 5, characterized in that: The bottom of the temporary coal hopper (2) is equipped with a guide funnel (46), and the opening at the top of the guide funnel (46) corresponds to the end of the extension cylinder (33). The discharge port of the guide funnel (46) extends into the interior of the screening cylinder (41) to transport raw coal into the interior of the screening cylinder (41).
7. The boiler fuel handling system as described in claim 6, characterized in that: A central rod (45) is installed at the center of the screening cylinder (41), and the central rod (45) is connected to the inner wall of the screening cylinder (41) through a connecting rod. One end of the central rod (45) is connected to the guide funnel (46) through a bearing, and the other end is connected to the support (47) through a bearing. A connecting gear (42) is connected to the end connected to the support (47), and the connecting gear (42) is connected to the motor through a chain (44).
8. The boiler fuel handling system as described in claim 7, characterized in that: The screening cylinder (41) is divided into three sections of material distribution cylinders with different screen holes, and a sealing cylinder (48) is fitted on the outside of the screening cylinder (41). The sealing cylinder (48) can slide outside the screening cylinder (41), and the length of the sealing cylinder (48) is the same as the length of each section of material distribution cylinder. Among them, the screen holes on the surface of the material distribution cylinder can be blocked by covering the outside of the material distribution cylinder with a sliding sealing cylinder (48).
9. The boiler fuel handling system as described in claim 1, characterized in that: The top of the raw coal hopper (51) is connected to a support frame (52), and the water spray pipe (53) is installed on the support frame (52), with the nozzle (54) on the support frame (52) facing the inside of the raw coal hopper (51); The support frame (52) is located at the end of the conveyor belt (1).