A coal feeding device capable of realizing rapid coal blending and distribution

Abstract

This utility model discloses a coal feeding device capable of rapid coal blending and distribution, comprising several coal bunkers containing high-quality or low-quality coal. Each bunker is connected to a coal feeder at its bottom, and each feeder has at least two inlets, one of which is connected to the bottom of the bunker. Each bunker includes a cylindrical section and a conical section. Multiple distribution bins are formed on the side wall of the conical section of one bunker. The bottom of each distribution bin is connected to the inlet of a screw conveyor, and the outlet of the screw conveyor is connected to another inlet of the feeder in the adjacent bunker. A clearing mechanism and a gate valve are sequentially installed between the distribution bins and the screw conveyor inlet, and between the screw conveyor outlet and the feeder inlet. This utility model, through the coordinated operation design of multiple coal bunkers, the directional transmission of the screw conveyor, and the clearing mechanism, achieves flexible coal type allocation and stable conveying, offering advantages such as improved coal bunker utilization, rapid coal type switching and blending, and reduced conveying blockages and maintenance frequency.

Description

Technical Field

[0001] This utility model relates to the field of coal bunker supply technology, specifically to a coal supply device that can achieve rapid coal blending and distribution. Background Technology

[0002] Currently, power plant coal supply systems commonly employ a traditional configuration where a single coal bunker corresponds to a single coal feeder. This configuration has significant limitations: First, because each coal bunker can only operate independently, other bunkers are forced to idle when rapid peak shaving and flexible coal type switching are required, resulting in low overall system utilization. Second, there is a response lag during coal type switching, failing to meet the demand for rapid fuel switching during grid peak shaving. Third, traditional systems lack coal mixing capabilities, making it difficult to achieve the required ratio of high-quality to low-quality coal. Especially during grid load fluctuations, traditional systems cannot guarantee combustion stability or achieve economical operation. Furthermore, existing coal supply devices are prone to blockages during material transport, severely impacting system reliability, while conventional unblocking devices suffer from incomplete unblocking and frequent maintenance. These defects severely restrict the flexibility and economy of power plant operation. Therefore, existing technologies urgently need improvement to address these issues. Utility Model Content

[0003] To address the aforementioned deficiencies, the purpose of this utility model is to provide a coal supply device capable of rapid coal blending and distribution. This device not only enables rapid coal blending and distribution to meet the specific coal type ratio requirements in certain coal supply scenarios, but also provides anti-blocking and clearing functions during the conveying process.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a coal feeding device capable of rapid coal blending and distribution, comprising several coal bunkers containing high-quality or low-quality coal, each coal bunker having a coal feeder connected to its bottom, each coal feeder having at least two feed inlets, one of which is connected to the bottom of the coal bunker; each coal bunker includes a cylindrical section and a conical section, wherein multiple distribution bins are opened on the side wall of the conical section of one coal bunker, the bottom of the distribution bins being connected to the feed end of a screw conveyor, the discharge end of the screw conveyor being connected to another feed inlet of the coal feeder of the adjacent coal bunker, and a clearing mechanism and a slide valve being sequentially provided between the distribution bins and the feed end of the screw conveyor, and between the discharge end of the screw conveyor and the feed inlet of the coal feeder.

[0005] Furthermore, the screw conveyor has an angle between its length and the ground ranging from 0 to 45°.

[0006] The unblocking mechanism includes a fixed cone, a rotating cone, and a fixed cylinder arranged sequentially from top to bottom and connected to each other. The top of the fixed cone is connected to the bottom of the distribution bin. A power mechanism is connected to the outside of the rotating cone. An upper moving blade is provided along the inner wall of the fixed cone, with one end of the upper moving blade fixed to the outer side of the rotating cone near the top. A middle fixed blade is provided along the inner wall of the rotating cone, with one end fixed to the outer side of the fixed cone near the bottom and the other end fixed to the outer side of the fixed cylinder near the top. A lower moving blade is provided along the inner wall of the fixed cylinder, with one end of the lower moving blade fixed to the outer side of the rotating cone near the bottom.

[0007] The slide gate valve is connected to the fixed cylinder in the unblocking mechanism.

[0008] This technical solution achieves flexible allocation of coal of different qualities through the coordinated configuration of multiple coal bunkers and the optimized design of material conveying paths. Specifically, multiple independent coal bunkers are set up to store high-quality or low-quality coal respectively, and the basic coal supply function is realized through coal feeders connected to the bottom of each bunker. By setting at least two feed inlets on each coal feeder, one of which is directly connected to the current coal bunker, and the other is connected to the distribution bin of the adjacent coal bunker through a screw conveyor, the coal from the adjacent coal bunker can be transported across bunkers to the current coal feeder through the screw conveyor, thus breaking the limitation of a single coal bunker corresponding to a single coal feeder. The coal bunker adopts a combination structure of cylindrical and conical sections, and multiple distribution bins are opened on the side wall of the conical section of a specific coal bunker. This retains the original storage function of the coal bunker and provides temporary buffer space for cross-bunker conveying through the distribution bins. The screw conveyor connects the distribution bin to the second feed inlet of the coal feeder in the adjacent coal bin, forming a cross-bin coal conveying channel. The anti-blocking mechanism is set at the connection between the distribution bin and the screw conveyor, and at the connection between the screw conveyor and the coal feeder. The mechanical structure prevents material blockage and ensures the continuity and reliability of cross-bin conveying.

[0009] By limiting the angle between the screw conveyor and the ground to within the range of 0-45°, the natural flow characteristics of the material within the screw conveyor are ensured. When the screw conveyor is horizontal or tilted at a small angle, the material is smoothly conveyed by the propulsive force of the screw blades, which is beneficial for the downward movement of coal and prevents the material from sliding backward due to gravity. This angle range effectively balances conveying efficiency and anti-clogging requirements, ensuring continuous feeding during the transfer of different coal types between the distribution bins while avoiding mechanical jamming caused by improper angles.

[0010] The unblocking mechanism forms a top-down material flow channel through a hierarchical interconnected structure of a fixed cone, a rotating cone, and a fixed cylinder. The top of the fixed cone connects to a distribution bin, allowing coal to enter the conical space first. Driven by a power mechanism, the rotating cone rotates, causing the upper moving blades to cut and crush the coal lumps on the inner wall of the fixed cone. The middle fixed blade spans the bottom of the fixed cone and the top of the fixed cylinder, serving as both a support structure for the rotating cone and, through its fixed position, squeezing and shearing the coal on the inner wall of the rotating cone, further preventing coal lumps from sticking together. The lower moving blade rotates with the bottom of the rotating cone, dynamically scraping the coal on the inner wall of the fixed cylinder to prevent coal accumulation at the end of the cylinder. By linking the upper and lower moving blades with the rotating cone, and coordinating with the static constraint of the middle fixed blade, a multi-stage crushing and unblocking mechanism is formed, ensuring that the coal remains in a flowing state during transport and effectively eliminating blockages in the vertical transport direction.

[0011] The beneficial effects of this utility model are: through the coordinated operation design of multiple coal bunkers, the directional transmission of the screw conveyor and the cooperation of the unblocking mechanism, the flexible allocation and stable transportation of coal types can be achieved, which has the advantages of improving the utilization rate of coal bunkers, realizing rapid switching and mixing of coal types, and reducing the frequency of conveying blockages and maintenance. Attached Figure Description

[0012] The structure and features of this utility model will be further described below with reference to the accompanying drawings.

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 This is a schematic diagram of the unblocking mechanism in this utility model.

[0015] Appendix Figure 1 and Figure 2 In the middle, 1. First coal bunker; 2. Second coal bunker; 3. Third coal bunker; 4. First coal feeder; 5. Second coal feeder; 6. Third coal feeder; 7. Distribution bin; 8. Unblocking mechanism; 9. Screw conveyor; 10. Fixed cone; 11. Upper moving cutter; 12. Column; 13. Rotating cone; 14. Middle fixed cutter; 15. Lower moving cutter; 16. Slide valve; 17. Fixed cylinder. Detailed Implementation

[0016] See appendix Figure 1 and 2This is one embodiment of the present invention, disclosing a coal supply device capable of rapid coal blending and distribution, comprising a first coal bunker 1, a second coal bunker 2, and a third coal bunker 3 containing high-quality or low-quality coal. The bottoms of the first coal bunker 1, the second coal bunker 2, and the third coal bunker 3 are respectively connected to a first coal feeder 4, a second coal feeder 5, and a third coal feeder 6. Each coal feeder has at least two feed inlets, one of which is connected to the bottom of each coal bunker. Each coal bunker includes a cylindrical section and a conical section. The conical section of the second coal bunker 2 has two distribution bins 7. The bottoms of the two distribution bins 7 are respectively connected to the feed ends of screw conveyors 9. The discharge ends of the screw conveyors 9 are respectively connected to the discharge ends of the first coal feeder 4 and the second coal feeder 5. A clearing mechanism 8 and a slide valve 16 are sequentially provided between the distribution bins 7 and the feed ends of the screw conveyors 9, and between the discharge ends of the screw conveyors 9 and the feed inlets of the coal feeders. The angle between the screw conveyor and the ground in the length direction ranges from 0 to 45°.

[0017] The unblocking mechanism 8 includes a fixed cone 10, a rotating cone 13, and a fixed cylinder 17 arranged sequentially from top to bottom and connected to each other. The top of the fixed cone 10 is connected to the bottom of the distribution bin 7. A power mechanism is connected to the outside of the rotating cone 13. An upper moving blade 11 is provided along the inner wall of the fixed cone 10. One end of the upper moving blade 11 is fixed to the outer side of the rotating cone 13 near the top. A middle fixed blade 14 is provided along the inner wall of the rotating cone 13. One end of the middle fixed blade 14 is fixed to the outer side of the fixed cone 10 near the bottom, and the other end is fixed to the outer side of the fixed cylinder 17 near the top. A lower moving blade 15 is provided along the inner wall of the fixed cylinder 17. One end of the lower moving blade 15 is fixed to the outer side of the rotating cone 13 near the bottom. The slide valve 16 is connected to the fixed cylinder 17 in the unblocking mechanism 8.

[0018] In the embodiments of this utility model, it is assumed that the first coal bunker 1 and the third coal bunker 3 contain low-quality coal, while the second coal bunker 2 contains high-quality coal. In the traditional method, because each coal bunker can only operate independently, when a specific quality of coal needs to be used in concentrated quantities, the other coal bunkers are forced to remain idle, resulting in low overall system utilization. After the technical solution of this utility model is modified, when a large amount of high-quality coal is needed and a small amount of low-quality coal is needed, according to the attached... Figure 1 In this configuration, both screw conveyors 9 can be opened, allowing the first coal feeder 4 and the second coal feeder 5 to supply not only low-quality coal but also high-quality coal. This provides multiple supply channels for high-quality coal, avoiding the response lag problem during coal type switching, meeting the demand for rapid fuel switching during power grid peak shaving, and enabling on-demand blending of high-quality and low-quality coal. Especially during power grid load fluctuations, the traditional system can ensure combustion stability while also maintaining economical operation.

[0019] In the above embodiments, if only high-quality coal is used, it is sufficient to close the feed inlets between the first coal feeder 4 and the first coal bunker 1, and between the third coal feeder 6 and the third coal bunker 3.

[0020] The technical solutions in this utility model embodiment are not unique and can be implemented in multiple ways. The first coal bunker 1 and the third coal bunker 3 can also be used to store high-quality coal, and the second coal bunker 2 can also be used to store low-quality coal. When all low-quality coal is used, the traditional coal outlets of the first coal bunker 1 and the third coal bunker 3 can be closed. Alternatively, when a large amount of low-quality coal is used and a small amount of high-quality coal is used, the traditional coal outlet of the first coal bunker 1 can be closed, leaving only the traditional coal outlet of the third coal bunker 3 open. In short, this utility model can realize coal supply in multiple scenarios and is not limited to a single solution.

[0021] In addition, the number of material distribution bins 7 in this embodiment can vary depending on the site space and situation. There can be one, two, three or more bins, each corresponding to multiple screw conveyors 9, to achieve arbitrary proportioning of high-quality coal and low-quality coal.

[0022] The above description is only a preferred embodiment of the present utility model. The above specific embodiments are not intended to limit the present utility model. Any modifications, alterations or equivalent substitutions made by those skilled in the art based on the above description shall fall within the protection scope of the present utility model.

Claims

1. A coal supply device capable of rapid coal blending and distribution, characterized in that: It includes several coal bunkers containing high-quality or low-quality coal. Each coal bunker is connected to a coal feeder at its bottom. Each coal feeder has at least two feed inlets, one of which is connected to the bottom of the coal bunker. Each coal bunker includes a cylindrical section and a conical section. Multiple distribution bins are opened on the side wall of the conical section of one coal bunker. The bottom of the distribution bin is connected to the feed end of a screw conveyor. The discharge end of the screw conveyor is connected to another feed inlet of the coal feeder of the adjacent coal bunker. A blockage clearing mechanism and a slide valve are installed sequentially between the distribution bin and the feed end of the screw conveyor, and between the discharge end of the screw conveyor and the feed inlet of the coal feeder.

2. The coal supply device capable of rapid coal blending and distribution according to claim 1, characterized in that: The angle between the screw conveyor and the ground along its length ranges from 0 to 45°.

3. The coal supply device capable of rapid coal blending and distribution according to claim 1, characterized in that: The unblocking mechanism includes a fixed cone, a rotating cone, and a fixed cylinder arranged sequentially from top to bottom and connected to each other. The top of the fixed cone is connected to the bottom of the distribution bin. A power mechanism is connected to the outside of the rotating cone. An upper moving blade is provided along the inner wall of the fixed cone, with one end of the upper moving blade fixed to the outer side of the rotating cone near the top. A middle fixed blade is provided along the inner wall of the rotating cone, with one end fixed to the outer side of the fixed cone near the bottom and the other end fixed to the outer side of the fixed cylinder near the top. A lower moving blade is provided along the inner wall of the fixed cylinder, with one end of the lower moving blade fixed to the outer side of the rotating cone near the bottom.

4. The coal supply device capable of rapid coal blending and distribution according to claim 3, characterized in that: The slide gate valve is connected to the fixed cylinder in the unblocking mechanism.

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