A coal conveying system for a boiler

Abstract

The utility model belongs to material conveying technical field relates to a kind of boiler coal conveying system. Including: coal bunker, first outlet and second outlet are arranged on it;First coal drop pipe, its inlet is connected with the first outlet of the coal bunker, and its outlet is connected with the input end of auger;Second coal drop pipe, its inlet is connected with the output end of the auger;Coal feeder platform, first coal feeder and second coal feeder are arranged at intervals on it;And the inlet of the first coal feeder is connected with the outlet of the second coal drop pipe, and the inlet of the second coal feeder is connected with the second outlet of the coal bunker by third coal drop pipe.The utility model system realizes the precise allocation of coal quality differentiation, dynamic prevention and control of coal blocking risk and the overall improvement of system operation efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of material conveying technology and relates to a boiler coal conveying system. Background Technology

[0002] Currently, the traditional coal conveying system, which commonly uses a single coal bunker with a fixed coal chute, has many technical limitations in actual operation. Because it employs a single conveying path, this system cannot flexibly adjust the coal mix when dealing with coals of different characteristics (such as those with significant differences in volatile matter content and calorific value). This makes it difficult for the boiler to optimize the coal blending according to combustion requirements, directly affecting combustion stability, boiler full-load operation, and pollutant emission control. Furthermore, the rigid design of the traditional direct-fall coal conveying structure prevents adjustments to the conveying method based on boiler load changes or coal characteristics, severely limiting the optimization potential of the system.

[0003] This design mode of a single coal bunker corresponding to a single coal feeder shows obvious limitations when dealing with the needs of multiple boilers operating in coordination or blending different types of coal. System expansion and transformation face high technical difficulties and economic costs.

[0004] Although existing technologies have improved solutions such as using separate coal supply compartments or adding coal mixing devices, these solutions often come with problems such as increased system complexity and relatively high costs. There is an urgent need for a new type of coal conveying system solution with relatively low cost. Utility Model Content

[0005] To address the problems in existing technologies, this utility model provides a boiler coal conveying system that achieves precise allocation of coal based on differences in quality, dynamic prevention and control of coal blockage risks, and a comprehensive improvement in system operating efficiency.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: This utility model provides a boiler coal conveying system, including: The coal bunker is equipped with a first and a second outlet. The first coal drop pipe has its inlet connected to the first outlet of the coal bunker, and its outlet connected to the input end of the auger. The second coal chute has its inlet connected to the output end of the screw conveyor. A coal feeder platform is provided with a first coal feeder and a second coal feeder spaced apart on it; the inlet of the first coal feeder is connected to the outlet of the second coal drop pipe, and the inlet of the second coal feeder is connected to the second outlet of the coal bunker through a third coal drop pipe.

[0007] Preferably, the central axis of the first coal drop pipe forms an inclined angle with the horizontal plane.

[0008] Preferably, the central axis of the second coal drop pipe forms an inclined angle with the horizontal plane.

[0009] Preferably, the tilt angle is in the range of 40° to 90°.

[0010] Preferably, the central axis of the third coal drop pipe is perpendicular to the horizontal plane.

[0011] Preferably, a first coal drop baffle is provided on the first coal drop pipe.

[0012] Preferably, a second coal drop baffle is provided on the second coal drop pipe.

[0013] Preferably, a third coal drop baffle is provided on the third coal drop pipe.

[0014] Preferably, the auger is mounted on an auger steel platform, and the auger steel platform is fixed to the coal feeder platform by support rods.

[0015] Preferably, the coal feeder platform is a weighing coal feeder platform.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The first outlet, in conjunction with the auger system, forms an adjustable conveying path, allowing coal to be delivered to the first coal feeder according to combustion requirements. The second outlet connects directly to the second coal feeder via a vertical coal drop pipe, retaining the high efficiency of the traditional direct supply method. This dual-mode coal conveying structure ensures both system reliability and flexibility in coal quality allocation, enabling a single coal bunker to simultaneously meet the conveying needs of multiple coal types. The introduction of the auger system enables precise control of coal flow, while the direct supply path guarantees basic conveying efficiency. Their complementary cooperation effectively solves the problems of poor coal quality adaptability and inflexible allocation in traditional systems, significantly improving the boiler's combustion optimization capabilities. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a boiler coal conveying system according to the present invention.

[0019] The components are: 1. Coal bunker; 2. First coal drop pipe; 3. Second coal drop pipe; 4. Screw auger; 5. Screw auger steel platform; 6. First coal feeder; 7. Coal feeder platform; 8. First coal drop baffle; 9. Second coal drop baffle; 10. Support rod; 11. Second coal feeder; 12. Third coal drop pipe; 13. Third coal drop baffle. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the 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.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the utility model. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] The present invention will now be described in further detail with reference to the accompanying drawings: This utility model provides a boiler coal conveying system, such as Figure 1 As shown, it includes: Coal bunker 1, which is equipped with a first outlet and a second outlet; The first coal drop pipe 2 has its inlet connected to the first outlet of the coal bunker 1, and its outlet connected to the input end of the screw conveyor 4. The second coal chute 3 has its inlet connected to the output end of the screw conveyor 4; The coal feeder platform 7 is provided with a first coal feeder 6 and a second coal feeder 11 at intervals; the inlet of the first coal feeder 6 is connected to the outlet of the second coal drop pipe 3, and the inlet of the second coal feeder 11 is connected to the second outlet of the coal bunker 1 through the third coal drop pipe 12.

[0027] The boiler coal conveying system provided by this utility model achieves flexible coal flow distribution through a dual-outlet design of the coal bunker 1. The first outlet is connected to the auger 4 via the first coal drop pipe 2, and then the coal is conveyed to the first coal feeder 6 via the second coal drop pipe 3. The second outlet is directly connected to the second coal feeder 11 via the third coal drop pipe 12, retaining the traditional direct supply method. This dual-path coal conveying design achieves intelligent coal quality distribution. The system can flexibly select the optimal conveying path according to the different characteristics of the raw coal (such as high volatile matter or high calorific value coal), selectively passing through the outlets to enter different coal feeders. This differentiated conveying mechanism not only meets the specific coal quality requirements of the boiler under different load conditions but also significantly improves fuel utilization efficiency. The coordinated operation of the dual paths retains the high efficiency of the traditional direct coal conveying method while achieving directional coal distribution through the auger system, enabling a single coal bunker to handle multiple coal types, greatly improving the flexibility of coal allocation while ensuring system reliability.

[0028] In this design, the central axis of the first coal drop pipe 2 and the horizontal plane, as well as the central axis of the second coal drop pipe 3 and the horizontal plane, form an inclined angle ranging from 40° to 90°. This angle range ensures the natural sliding of the coal flow under gravity, preventing stagnation or accumulation due to an excessively small inclination angle, while also preventing impact wear and equipment vibration caused by excessively high coal flow velocity when the inclination angle is too large. Simultaneously, this design effectively reduces the risk of wet coal adhering to the pipe wall. Through the synergistic effect of gravity and coal flow inertia, it achieves continuous and stable coal transport, thereby reducing the probability of coal blockage and extending the service life of the coal drop pipes. The central axis of the third coal drop pipe 12 is perpendicular to the horizontal plane. The vertical structure makes full use of gravity acceleration, allowing the coal flow to reach the second coal feeder 11 directly via the shortest path and with the highest efficiency, which is suitable for working conditions requiring rapid response or high-flow transportation. The vertical arrangement eliminates the frictional resistance between the coal flow and the pipe wall, which not only avoids the segregation of coal powder during transportation, but also significantly reduces the risk of pipe blockage, while simplifying the pipeline support structure.

[0029] For example, a first coal drop baffle 8 is installed on the first coal drop pipe 2, a second coal drop baffle 9 is installed on the second coal drop pipe 3, and a third coal drop baffle 13 is installed on the third coal drop pipe 12. The first coal drop baffle 8 can quickly cut off the coal flow from the coal bunker 1 to the auger 4, avoiding disorderly accumulation of coal when the auger 4 starts; the second coal drop baffle 9 is linked with the auger 4 to ensure smooth coal flow at the target feeder inlet during the auger 4 conveying process; and the third coal drop baffle 13 ensures the independent start-stop capability of the direct supply path of the coal bunker 1, retaining the reliability of the traditional coal conveying method. The synergistic effect of multiple baffles significantly improves the system's adaptability to different coal qualities (such as high volatile matter or high calorific value coal), while effectively reducing the probability of coal blockage through physical isolation, thus enhancing the stability and operational flexibility of the boiler coal conveying system.

[0030] The auger 4 is mounted on the auger steel platform 5, which is fixed to the coal feeder platform 7 by support rods 10. The auger steel platform 5 provides a stable installation foundation for the auger 4, effectively absorbing vibrations generated by the screw conveyor. The rigid connection of the support rods 10 ensures the stability of the overall structure and allows for spatial layering, avoiding interference with existing coal conveying pipelines. This overhead design not only facilitates the inspection and maintenance of the auger 4 but also allows for flexible adjustment of its installation position according to site space conditions, ensuring reliable power transmission while maintaining the neatness and expandability of the coal conveying system layout.

[0031] In addition, the coal feeder platform 7 is a weighing coal feeder platform, which integrates weighing sensors to ensure dynamic matching between coal quantity and boiler load demand.

[0032] In practical applications, coal bunker 1 can have multiple first outlets. Each first outlet is sequentially connected to a first coal drop pipe 2, an auger 4, a second coal drop pipe 3, and multiple different coal feeders, forming a multi-path parallel coal conveying system. This multi-outlet configuration not only enables flexible allocation of coal flow (such as directional conveying based on differences in volatile matter and calorific value), but also allows for PLC control of the interlocking opening and closing of baffles along each path, ensuring that other paths can be quickly switched on and put into operation in case of failure in any one path, significantly improving system redundancy and coal supply continuity. Simultaneously, each coal feeder platform 7 uses weighing sensors to provide real-time feedback on coal quantity, dynamically adjusting the coordinated coal supply ratio of multiple paths based on boiler load demand, ultimately achieving the dual goals of maximizing combustion efficiency and minimizing coal blockage risk.

[0033] In one embodiment of the present invention, each coal feeder is equipped with an independent coal bunker 1. Each coal bunker 1 is directly connected to the corresponding coal feeder via a vertical coal drop pipe, forming a basic coal supply path. Simultaneously, each coal bunker 1 is interconnected with multiple surrounding coal feeders through a conveying system consisting of a first coal drop pipe 2, an auger 4, and a second coal drop pipe 3, constructing a dual-mode coal conveying network combining direct supply and distribution. This design retains the rapid response characteristics of traditional vertical coal drop while also enabling coal quantity adjustment between coal bunkers 1 through the auger conveying system. When a coal bunker 1 needs maintenance or experiences a coal supply anomaly, adjacent coal bunkers 1 can supplement its coal supply through the auger system, significantly improving system redundancy and operational reliability. Furthermore, the auger 4 is interlocked with the coal drop baffle on the vertical coal drop pipe of the coal feeder to prevent the risk of blockage caused by parallel coal supply.

[0034] The working process of this utility model is as follows: Start-up phase: First, start the first coal feeder 6, then open the second coal drop baffle 9 and the first coal drop baffle 8, and finally start the screw conveyor 4; Stopping phase: First, close the first coal drop baffle 8, then stop the auger 4 after a delay, then close the second coal drop baffle 9, and finally stop the first coal feeder 6 after a delay.

[0035] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A boiler coal conveying system, characterized in that, include: Coal bunker (1), which is equipped with a first outlet and a second outlet; The first coal drop pipe (2) has its inlet connected to the first outlet of the coal bunker (1) and its outlet connected to the input end of the screw conveyor (4); The second coal drop pipe (3) has its inlet connected to the output end of the screw conveyor (4); A coal feeder platform (7) is provided with a first coal feeder (6) and a second coal feeder (11) spaced apart; and the inlet of the first coal feeder (6) is connected to the outlet of the second coal drop pipe (3), and the inlet of the second coal feeder (11) is connected to the second outlet of the coal bunker (1) through a third coal drop pipe (12).

2. The boiler coal conveying system according to claim 1, characterized in that, The central axis of the first coal drop pipe (2) forms an inclined angle with the horizontal plane.

3. A boiler coal conveying system according to claim 1, characterized in that, The central axis of the second coal drop pipe (3) forms an inclined angle with the horizontal plane.

4. A boiler coal conveying system according to claim 2 or 3, characterized in that, The range of the tilt angle is 40° to 90°.

5. A boiler coal conveying system according to claim 1, characterized in that, The central axis of the third coal drop pipe (12) is perpendicular to the horizontal plane.

6. A boiler coal conveying system according to claim 1, characterized in that, The first coal drop pipe (2) is provided with a first coal drop baffle (8).

7. A boiler coal conveying system according to claim 1, characterized in that, A second coal drop baffle (9) is provided on the second coal drop pipe (3).

8. A boiler coal conveying system according to claim 1, characterized in that, The third coal drop pipe (12) is equipped with a third coal drop baffle (13).

9. A boiler coal conveying system according to claim 1, characterized in that, The auger (4) is mounted on the auger steel platform (5), and the auger steel platform (5) is fixed to the coal feeder platform (7) by a support rod (10).

10. A boiler coal conveying system according to claim 1, characterized in that, The coal feeder platform (7) is a weighing coal feeder platform.

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