Coal feeding device for raw coal bunker

Abstract

The invention belongs to the technical field of coal-fired power generation coal feeding equipment, and particularly relates to a coal feeding device for a raw coal bunker, which comprises a raw coal bunker A and a raw coal bunker B. The raw coal bunker A and the raw coal bunker B are adjacently arranged. The small shrimp curve damp-proof coal buckets are fixedly welded to the bin walls of the raw coal bin A and the raw coal bin B, the small shrimp curve damp-proof coal buckets horizontally extend to the positions over outlets of original coal feeders of the opposite sides, and newly-added coal feeders which are arranged in an up-down stacked mode are arranged for each small shrimp curve damp-proof coal bucket. Meanwhile, a bidirectional pneumatic slide plate gate is arranged at the inlet end of the newly added coal feeder, a double-cylinder self-orbital-transfer sealing slide plate gate is arranged at the outlet end of the newly added coal feeder, and seamless connection with the original coal feeder is realized through a self-adjusting coal flow device, so that a special cross-bunker coal blending structure in which the raw coal bunker A and the raw coal bunker B are communicated with each other is constructed, and the limitation of independent coal supply of the traditional raw coal bunker is broken through.

Description

Technical Field

[0001] This invention belongs to the technical field of coal feeding equipment for coal-fired power generation, and specifically relates to a coal feeding device for raw coal bunkers. Background Technology

[0002] During the operation of coal-fired power generating units, the demand for coal type supply differs between peak load and off-peak operating conditions. During peak load, sufficient high-quality coal is required to ensure the calorific value of combustion, while during off-peak conditions, the blending of economical coal types such as Zhundong coal is required to control power generation costs. This places high demands on the flexibility and accuracy of coal blending in the raw coal bunker feeding device.

[0003] Existing raw coal bunker feeding devices generally adopt an independent coal supply design for adjacent raw coal bunkers. Raw coal bunkers A and B only transport coal to the corresponding coal mills through their own raw coal feeders. There is no dedicated interconnection coal blending structure between the bunkers, which makes it impossible to realize cross-bunker coal type transportation and blending. The coal blending method is singular, making it difficult to quickly adjust the supply ratio of high-quality coal and economic coal according to the unit's operating conditions, and unable to simultaneously meet the coal blending needs of peak shaving and off-peak periods. In addition, some existing raw coal bunkers are simply modified to achieve cross-bunker coal blending, simply adding small, moisture-proof coal hoppers with small curves, coal feeders, etc., without supporting structural design and integrated control system, resulting in many operational defects. Such modifications lack supporting and reinforcing structures adapted to the newly added coal blending components. The small, moisture-proof coal hoppers with their curved profiles and the newly added coal feeders are prone to cracking at weld joints and structural deformation due to uneven stress. Furthermore, the absence of targeted unblocking and flow-aiding structures makes it easy for coal to become clogged during transport, affecting the continuity of coal blending. Additionally, the gas supply pipelines for the newly added gate valves lack standardized layout, and the coal blending equipment lacks integrated control cabinets. This not only makes equipment operation and debugging cumbersome but also results in insufficient precision in controlling the on / off state of the coal blending pathways, preventing the precise blending of any coal type. This restricts the increase in the blending ratio of economical coal types and increases equipment maintenance costs. Summary of the Invention

[0004] The purpose of this invention is to provide a coal feeding device for raw coal bunkers, which solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A coal feeding device for a raw coal bunker includes an adjacent raw coal bunker A and a raw coal bunker B. The discharge end of the raw coal bunker A is fixedly connected to a raw coal feeder A, and the discharge end of the raw coal bunker B is fixedly connected to a raw coal feeder B. Both raw coal bunkers A and B have small, curved, moisture-proof coal hoppers fixedly welded to their walls. The small, curved, moisture-proof coal hoppers of raw coal bunker B extend horizontally towards raw coal bunker A, and the discharge end of the small, curved, moisture-proof coal hoppers of raw coal bunker B is located directly above the outlet of the raw coal feeder of raw coal bunker A. The small, curved, moisture-proof coal hoppers of raw coal bunker A extend horizontally towards raw coal bunker B, and the discharge end of the small, curved, moisture-proof coal hoppers of raw coal bunker A is located directly above the outlet of the raw coal feeder of raw coal bunker B. Each of the aforementioned shrimp-curve moisture-proof small coal hoppers has a fixed connection at its discharge end to a new coal feeder. There are two new coal feeders arranged in a stacked manner, and the two new coal feeders are fixedly connected to the original coal silo wall via a bracket. The inlet end of each new coal feeder is fixedly installed with a bidirectional pneumatic gate, which is sealed and connected to the discharge port of the shrimp-curve moisture-proof small coal hopper. The outlet end of each new coal feeder is fixedly installed with a double-cylinder self-changing track sealing gate, and the discharge end of the double-cylinder self-changing track sealing gate is fixedly and sealed and connected to a self-regulating coal flow device. The discharge end of the self-regulating coal flow device is located directly above the outlet of the original coal feeder. Both raw coal bunkers A and B are fixedly equipped with support and reinforcement components that connect to the shrimp-curve moisture-proof small coal hoppers. Clearing and flow-aiding components are fixedly installed at the outlet of the newly added coal feeder and on the walls of raw coal bunkers A and B. A compartment control cabinet is set up next to raw coal bunkers A and B. The compartment control cabinet is electrically connected to the bidirectional pneumatic slide gate, the double-cylinder self-changing rail sealing slide gate, the newly added coal feeder, and the clearing and flow-aiding components via electrical lines.

[0006] Preferably, the support and reinforcement assembly includes three T-shaped ring beams, which are spaced vertically and welded to the walls of raw coal bunkers A and B. The inner walls of the T-shaped ring beams are welded and fixed to the outer walls of the shrimp-curved moisture-proof small coal hoppers. Reinforcing ribs are welded between the T-shaped ring beams and the walls of the raw coal bunkers.

[0007] Preferably, the support and reinforcement assembly further includes a support plate and a support beam. One side of the support plate is fixed to the wall of the raw coal bunker by chemical bolts, and the other side of the support plate is welded to the support beam. The support beam is arranged along the horizontal direction of the raw coal bunker, and three support plates are spaced apart on a single support beam. Vertical stiffeners are also welded between the T-shaped ring beam and the shrimp-curved moisture-proof small coal hopper.

[0008] Preferably, the unblocking and flow-aiding component includes multiple bin wall vibrating hammers, some of which are installed at the outlet of the new coal feeder, and the remaining bin wall vibrating hammers are installed in three layers (upper, middle, and lower) on the bin walls of raw coal bins A and B respectively. Preferably, the unblocking and flow-aiding assembly further includes an unblocking air hammer pipeline and a sealing air pipeline. One end of the unblocking air hammer pipeline is connected to the plant's compressed air supply, and the other end of the unblocking air hammer pipeline is connected to the vibrating air hammers of each silo wall through a stainless steel pipe in sections. One end of the sealing air pipeline is connected to a sealing air source, and the other end of the sealing air pipeline is connected to the A original coal feeder and the B original coal feeder respectively through a carbon steel pipe.

[0009] Preferably, the bidirectional pneumatic slide gate is connected to an air source pipeline, which is made of 304 stainless steel and has a specification of DN10. One end of the air source pipeline is connected to the instrument compressed air, and the other end of the air source pipeline is connected to the cylinder of the bidirectional pneumatic slide gate. A pressure regulating valve, a quick exhaust valve, a pressure gauge and a filter cup are installed sequentially on the air source pipeline. The air source pipeline of the dual-cylinder self-changing track sealing slide gate and the air source pipeline of the bidirectional pneumatic slide gate are arranged in the same way.

[0010] Preferably, an operating platform is also fixedly installed on the outside of the A and B raw coal bunkers. The height of the operating platform is adapted to the installation height of the newly added coal feeder. The platform surface is set directly opposite the newly added coal feeder, the bidirectional pneumatic slide gate, and the double-cylinder self-changing rail sealing slide gate.

[0011] Preferably, the compartment control cabinet is equipped with a terminal block, and the compartment control cabinet integrates an inlet gate electrical control circuit, an outlet gate electrical control circuit, and a blockage clearing and flow assisting electrical control circuit. The inlet gate electrical control circuit is electrically connected to the bidirectional pneumatic gate through the terminal block, the outlet gate electrical control circuit is electrically connected to the dual-cylinder self-changing rail sealing gate through the terminal block, and the blockage clearing and flow assisting electrical control circuit is electrically connected to the blockage clearing and flow assisting assembly through the terminal block.

[0012] Preferably, the shrimp-curved moisture-proof small coal hopper is made of stainless steel, the inlet of the shrimp-curved moisture-proof small coal hopper is connected to the inside of the raw coal bunker, the outlet of the shrimp-curved moisture-proof small coal hopper is coaxially set with the inlet end of the newly added coal feeder, and the weld between the shrimp-curved moisture-proof small coal hopper and the wall of the raw coal bunker is sealed.

[0013] Preferably, the discharge end of the self-regulating coal flow device is a downwardly inclined arc-shaped structure. The lower edge of the discharge end of the self-regulating coal flow device is closely attached to and seamlessly connected with the upper edge of the corresponding original coal feeder outlet. The housing of the self-regulating coal flow device and the housing of the corresponding original coal feeder are fixedly connected by a connecting rod. The two ends of the connecting rod are respectively welded and fixed to the self-regulating coal flow device and the original coal feeder.

[0014] Preferably, the outer cover of the newly added coal feeder is equipped with a stainless steel sealing cover, and the stainless steel sealing cover is fitted with stainless steel sealing glass. The connection gaps between the stainless steel sealing cover and the raw coal bunker wall and the operating platform are all sealed.

[0015] The beneficial effects of this invention are as follows: 1) This invention involves fixing and welding small, shrimp-curve moisture-proof coal hoppers to the walls of raw coal bunkers A and B, extending these hoppers horizontally to directly above the outlet of the original coal feeder in the other bunker. Each small, shrimp-curve moisture-proof coal hopper is equipped with a new coal feeder arranged in a stacked configuration. The new feeders have bidirectional pneumatic gates at their inlet and dual-cylinder self-regulating rail sealing gates at their outlet. A self-regulating coal flow device enables seamless connection with the original coal feeders, creating a dedicated cross-bunker coal distribution structure that connects raw coal bunkers A and B. This breaks the limitations of traditional independent coal supply from raw coal bunkers. Furthermore, the two new coal feeders can operate independently or synchronously, and with the help of the compartment control cabinet, the coal distribution pathway can be precisely controlled, allowing for precise blending of high-quality coal and economical coal in any proportion. The coal supply can be quickly adjusted according to the unit's operating conditions, meeting different coal distribution needs during peak and off-peak periods without the need for additional raw coal bunkers, significantly improving coal distribution flexibility and reducing equipment investment costs. 2) This invention, through the installation of a support and reinforcement assembly connected to the shrimp-curve moisture-proof small coal hopper, utilizes three T-shaped ring beams spaced vertically and welded to the outer wall of the shrimp-curve moisture-proof small coal hopper. Combined with a multi-layered support structure of reinforcing ribs, support plates, and support beams, this provides stable stress support for the shrimp-curve moisture-proof small coal hopper and the newly added coal feeder, preventing structural damage due to uneven stress and improving the overall structural stability of the device. Simultaneously, unblocking and flow-aiding components are installed at the outlet of the new coal feeder and on the walls of the raw coal bin. Multi-layered bin wall vibrating hammers, combined with unblocking hammer pipelines and sealing air pipelines, effectively solve the problem of bin blockage during coal transportation, ensuring the continuity of coal blending. The moisture-proof small coal hopper is made of stainless steel with sealed welds. The new coal feeder is covered with a stainless steel sealing cover with stainless steel sealing glass, which improves the moisture-proof and sealing performance of the device. An operating platform with a height adapted to the new coal feeder is set up to facilitate equipment inspection and maintenance. The bidirectional pneumatic slide gate uses a DN10 specification air source pipeline of 304 stainless steel and is laid on the same route as the double cylinder self-changing rail sealing slide gate, ensuring the stability of the slide gate operation. The self-adjusting coal flow device is fixed to the original coal feeder through a connecting rod and is seamlessly connected to the discharge end to avoid coal spillage. While improving the accuracy of coal blending and operating efficiency, it effectively increases the proportion of economic coal blending and reduces the power generation and operating costs of coal-fired units. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2This is a top view of the present invention; Figure 3 This is a rear view of the present invention; Figure 4 This is a side view of the present invention; Figure 5 This is a schematic diagram of the bidirectional pneumatic slide gate structure of the present invention; Figure 6 This is a schematic diagram of the dual-cylinder self-changing track sealing insert door structure of the present invention; Figure 7 This is a schematic diagram of the support and reinforcement component structure of the present invention; Figure 8 This is one of the schematic diagrams of the support and reinforcement component structure of the present invention; Figure 9 This is a second schematic diagram of the support and reinforcement component structure of the present invention; Figure 10 This is a pipeline diagram of the unblocking air hammer of the present invention; Figure 11 This is a diagram of the sealed air ductwork of the present invention; Figure 12 This is one of the sealing air duct pipeline diagrams of the present invention; Figure 13 This is a schematic diagram of the compartment control cabinet structure of the present invention.

[0017] Among them: 100, A raw coal bunker; 110, A raw coal feeder; 200, B raw coal bunker; 210, B raw coal feeder; 300, shrimp-shaped curved moisture-proof small coal hopper; 400, newly added coal feeder; 410, bidirectional pneumatic slide gate; 411, air source pipeline; 420, double-cylinder self-changing rail sealing slide gate; 430, self-regulating coal flow device; 431, connecting rod; 500, support and reinforcement components; 510, T-shaped ring beam; 520, reinforcing ribs; 530, support plate. 540. Support beam; 550. Vertical stiffening plate; 600. Unblocking and flow-aiding assembly; 610. Warehouse wall vibrating hammer; 620. Unblocking and flow-aiding hammer pipeline; 630. Sealing air duct; 700. Warehouse control cabinet; 710. Terminal block; 720. Inlet gate electrical control circuit; 730. Outlet gate electrical control circuit; 740. Unblocking and flow-aiding electrical control circuit; 800. Operating platform; 900. Stainless steel sealing cover; 910. Stainless steel sealing glass. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0019] The following detailed description is exemplary and intended to provide further detailed explanation of the invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention.

[0020] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limitations on this invention.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. It should be noted in the description of this invention that, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" 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 invention based on the specific circumstances.

[0022] Example like Figures 1-13 As shown, a coal feeding device for a raw coal bunker includes an A raw coal bunker 100 and a B raw coal bunker 200 arranged adjacent to each other. An A raw coal feeder 110 is fixedly connected to the discharge end of the A raw coal bunker 100, and a B raw coal feeder 210 is fixedly connected to the discharge end of the B raw coal bunker 200. Both raw coal bunker A 100 and raw coal bunker B 200 have their walls fixedly welded with small, curved, moisture-proof coal hoppers 300. The small, curved, moisture-proof coal hoppers 300 of raw coal bunker B 200 extend horizontally toward the side of raw coal bunker A 100, and the discharge end of the small, curved, moisture-proof coal hoppers 300 of raw coal bunker B 200 is located directly above the outlet of raw coal feeder 110 of raw coal bunker A. The small, curved, moisture-proof coal hoppers 300 of raw coal bunker A 100 extend horizontally toward the side of raw coal bunker B 200, and the discharge end of the small, curved, moisture-proof coal hoppers 300 of raw coal bunker A 100 is located directly above the outlet of raw coal feeder 210 of raw coal bunker B. Each of the shrimp-shaped, moisture-proof small coal hoppers 300 has a fixed connection at its discharge end to a new coal feeder 400. There are two new coal feeders 400 arranged in a stacked manner. The two new coal feeders 400 are fixedly connected to the original coal bin wall through a bracket. A bidirectional pneumatic gate 410 is fixedly installed at the inlet end of the new coal feeder 400. The bidirectional pneumatic gate 410 is sealed and connected to the discharge port of the shrimp-shaped, moisture-proof small coal hopper 300. A double-cylinder self-changing track sealing gate 420 is fixedly installed at the outlet end of the new coal feeder 400. The discharge end of the double-cylinder self-changing track sealing gate 420 is fixedly and sealed and connected to a self-regulating coal flow device 430. The discharge end of the self-regulating coal flow device 430 is located directly above the outlet of the original coal feeder. Both raw coal bunker A (100) and raw coal bunker B (200) are fixedly equipped with support and reinforcement components 500 that are connected to the shrimp-shaped moisture-proof small coal hopper 300. A blockage clearing and flow assisting component 600 is fixedly installed at the outlet of the newly added coal feeder 400 and on the walls of raw coal bunkers A (100) and B (200). A compartment control cabinet 700 is located next to raw coal bunkers A (100) and B (200). The compartment control cabinet 700 is electrically connected to the bidirectional pneumatic slide gate 410, the dual-cylinder self-changing rail sealing slide gate 420, the newly added coal feeder 400, and the blockage clearing and flow assisting component 600 via electrical wiring.

[0023] Specifically, during cross-bin coal blending, the sub-bin control cabinet 700 first opens the bidirectional pneumatic slide gate 410, allowing coal from either raw coal bin A 100 or raw coal bin B 200 to slide into the small, moisture-proof, curved coal hopper 300. The small, moisture-proof, curved coal hopper 300 guides the new feeder 400, which then starts conveying the coal. Simultaneously, the sub-bin control cabinet 700 opens the double-cylinder self-changing track sealing slide gate 420, through which the coal enters the self-regulating coal flow device 430. The self-regulating coal flow device 430 guides the coal to the corresponding outlet of the original feeder to complete the cross-bin conveying. During this process, the support and reinforcement component 500 provides stable support for the small, moisture-proof, curved coal hopper 300 and the new feeder 400, while the unblocking and flow-aiding component 600 continuously prevents blockages. The sub-bin control cabinet 700 can also adjust the operating status of the new feeder 400 to achieve blending of different coal types and adapt to the coal blending needs of different operating conditions of the unit.

[0024] In this embodiment: the support and reinforcement component 500 includes three T-shaped ring beams 510, which are spaced vertically and welded to the walls of raw coal bunker A 100 and raw coal bunker B 200. The inner wall of the T-shaped ring beams 510 is welded and fixed to the outer wall of the shrimp-curved moisture-proof small coal hopper 300. Reinforcing ribs 520 are welded between the T-shaped ring beams 510 and the walls of the raw coal bunkers.

[0025] Specifically, the support and reinforcement component 500, through the cooperation of three T-shaped ring beams 510 and reinforcing ribs 520, provides effective and stable support for the shrimp-curve moisture-proof small coal hopper 300. The three T-shaped ring beams 510 are interspersed and welded to the walls of raw coal hopper A 100 and raw coal hopper B 200, while the inner wall is tightly welded to the outer wall of the shrimp-curve moisture-proof small coal hopper 300. This evenly distributes the weight of the coal and the equipment load of the newly added coal feeder 400 borne by the shrimp-curve moisture-proof small coal hopper 300 to the walls of the raw coal hopper, avoiding load concentration that could cause cracking at the weld. The reinforcing ribs 520 are welded between the T-shaped ring beam 510 and the raw coal bunker wall, which strengthens the connection between the T-shaped ring beam 510 and the bunker wall and offsets the lateral deformation caused by the load on the T-shaped ring beam 510. At the same time, the three T-shaped ring beams 510 are arranged at intervals to provide targeted support for different parts of the shrimp-curved moisture-proof small coal hopper 300, preventing it from bending and shifting due to uneven stress.

[0026] In this embodiment: the support and reinforcement component 500 also includes a support plate 530 and a support beam 540. One side of the support plate 530 is fixed to the wall of the raw coal bunker by chemical bolts, and the other side of the support plate 530 is welded to the support beam 540. The support beam 540 is arranged along the horizontal direction of the raw coal bunker. Three support plates 530 are spaced apart on a single support beam 540. Vertical stiffeners 550 are also welded between the T-shaped ring beam 510 and the shrimp-curved moisture-proof small coal hopper 300.

[0027] Specifically, the support plate 530 and support beam 540 are equipped with vertical stiffener plates 550, which, together with the T-shaped ring beam 510 and reinforcing vertical stiffeners 520, form a secondary support system to further improve structural stability. The support beam 540 is horizontally arranged along raw coal bunker A 100 and raw coal bunker B 200. One end of the three support plates 530 on each support beam 540 is fixed to the bunker wall with chemical bolts, and the other end is welded to the support beam 540, thus distributing the load of the support beam 540. Distributed to different points on the silo wall, the support beam 540 abuts against the bottom of the shrimp-curved moisture-proof small coal hopper 300, offsetting its vertical downward sinking load, and forming a two-way support with the T-shaped ring beam 510. The vertical stiffener plate 550 is welded between the T-shaped ring beam 510 and the shrimp-curved moisture-proof small coal hopper 300, so that the load of the shrimp-curved moisture-proof small coal hopper 300 is more evenly distributed to the T-shaped ring beam 510, and can also offset the vibration load of the newly added coal feeder 400, preventing the welded parts from loosening.

[0028] In this embodiment: the unblocking and flow-aiding component 600 includes multiple bin wall vibrating hammers 610. Some of the bin wall vibrating hammers 610 are installed at the outlet of the new coal feeder 400, and the remaining bin wall vibrating hammers 610 are installed in three layers (upper, middle and lower) on the bin walls of raw coal bin A 100 and raw coal bin B 200 respectively. The unblocking and flow-aiding assembly 600 also includes an unblocking air hammer pipeline 620 and a sealing air pipeline 630. One end of the unblocking air hammer pipeline 620 is connected to the plant's compressed air supply, and the other end of the unblocking air hammer pipeline 620 is connected to the vibrating air hammers 610 of each silo wall through a stainless steel pipe. One end of the sealing air pipeline 630 is connected to a sealing air source, and the other end of the sealing air pipeline 630 is connected to the original coal feeder 110 (A) and the original coal feeder 210 (B) through a carbon steel pipe.

[0029] Specifically, the unblocking and flow-aiding component 600 is connected to the plant's compressed air supply through the unblocking air hammer pipeline 620. It supplies pressure to the vibrating air hammers 610 of each bin wall through stainless steel pipes in sections. Some of the bin wall vibrating air hammers 610 are installed at the outlet of the newly added coal feeder 400 to vibrate and unblock key nodes in the conveying process. The remaining bin wall vibrating air hammers 610 are installed in three layers (upper, middle, and lower) on the bin walls of raw coal bins A (100) and B (200) to break up coal stuck to and accumulated on the bin walls, ensuring that the coal can smoothly slide into the shrimp-shaped, moisture-proof small coal hopper 300. Meanwhile, one end of the sealing air pipeline 630 is connected to a sealing air source and is connected to raw coal feeders A (110) and B (210) through carbon steel pipes to form an air seal to prevent air leakage and backflow of coal dust. At the same time, the airflow assists in promoting the flow of coal dust. The combination of vibration unblocking and airflow assistance fundamentally solves the bin blockage problem and ensures the continuity of coal blending.

[0030] In this embodiment: the bidirectional pneumatic slide gate 410 is connected to an air source pipeline 411, which is made of 304 stainless steel and has a specification of DN10. One end of the air source pipeline 411 is connected to the instrument compressed air, and the other end of the air source pipeline 411 is connected to the cylinder of the bidirectional pneumatic slide gate 410. A pressure regulating valve, a quick exhaust valve, a pressure gauge and a filter cup are installed on the air source pipeline 411 in sequence. The air source pipeline of the dual-cylinder self-changing track sealing slide gate 420 and the air source pipeline of the bidirectional pneumatic slide gate 410 are arranged in the same way.

[0031] Specifically, the air supply pipeline 411 provides stable power to the bidirectional pneumatic slide gate 410. Made of 304 stainless steel and with a DN10 specification, it is suitable for power plant industrial environments. One end is connected to instrument compressed air. A pressure regulating valve on the pipeline precisely adjusts the air pressure, ensuring the bidirectional pneumatic slide gate 410 has appropriate opening and closing force. A quick-release valve enhances its opening and closing sensitivity. A pressure gauge monitors the air pressure in real time, and a filter cup filters impurities and moisture from the air supply, preventing wear and jamming of the cylinder components of the bidirectional pneumatic slide gate 410. The air supply pipeline of the dual-cylinder self-changing rail sealing slide gate 420 is laid along the same route as the air supply pipeline 411 of the bidirectional pneumatic slide gate 410, achieving synchronous pressure regulation and coordinated action control between the two. This avoids the problem of internal pressure buildup or coal accumulation in the newly added coal feeder 400 caused by unidirectional opening. Simultaneously, the shared route reduces pipeline laying costs and facilitates unified debugging and maintenance of the pneumatic system in the future.

[0032] In this embodiment: an operating platform 800 is also fixedly installed on the outside of raw coal bunker A 100 and raw coal bunker B 200. The height of the operating platform 800 is adapted to the installation height of the newly added coal feeder 400. The platform surface of the operating platform 800 is set directly opposite the newly added coal feeder 400, the bidirectional pneumatic slide gate 410 and the double cylinder self-changing rail sealing slide gate 420.

[0033] Specifically, during routine inspections, staff can closely inspect the sealing status of the bidirectional pneumatic slide gate 410, the track path of the dual-cylinder self-changing rail sealed slide gate 420, and the operating status of the newly added coal feeder 400 on the operating platform 800. This allows for timely detection of equipment abnormalities. When repairing equipment malfunctions, disassembly and debugging can be carried out directly on the operating platform 800 without the need for temporary supports, improving maintenance efficiency and reducing the risks of working at height. At the same time, the operating platform 800 can also protect the surrounding air supply pipeline 411 and electrical lines from damage caused by trampling and collisions.

[0034] In this embodiment: The compartment control cabinet 700 is equipped with a terminal block 710. The compartment control cabinet 700 integrates an inlet gate electrical control circuit 720, an outlet gate electrical control circuit 730, and a blockage clearing and flow assisting electrical control circuit 740. The inlet gate electrical control circuit 720 is electrically connected to the bidirectional pneumatic gate 410 through the terminal block 710. The outlet gate electrical control circuit 730 is electrically connected to the dual-cylinder self-changing rail sealing gate 420 through the terminal block 710. The blockage clearing and flow assisting electrical control circuit 740 is electrically connected to the blockage clearing and flow assisting assembly 600 through the terminal block 710.

[0035] Specifically, the compartment control cabinet 700 achieves orderly line transfer with each execution device through the terminal block 710, so that the control lines do not interfere with each other and facilitate later troubleshooting and maintenance. The inlet gate electrical control circuit 720 inside the compartment control cabinet 700 specifically controls the bidirectional pneumatic gate 410, supporting remote and local dual control modes. The outlet gate electrical control circuit 730 controls the dual-cylinder self-changing rail sealing gate 420, and the two circuits form a linkage logic to ensure that the bidirectional pneumatic gate 410 and the dual-cylinder self-changing rail sealing gate 420 open and close synchronously. The unblocking and flow-aiding electrical control circuit 740 controls the unblocking and flow-aiding component 600, which can flexibly adjust the vibration frequency and duration of the bin wall vibrating hammer 610. The circuits are independent yet can work together, allowing staff to centrally control all equipment through the sub-bin control cabinet 700, improving the convenience and accuracy of coal blending operations. In case of equipment failure, the problem can also be quickly located through each circuit.

[0036] In this embodiment: the shrimp-curved moisture-proof small coal hopper 300 is made of stainless steel. The inlet of the shrimp-curved moisture-proof small coal hopper 300 is connected to the inside of the raw coal bunker. The outlet of the shrimp-curved moisture-proof small coal hopper 300 is coaxially set with the inlet end of the newly added coal feeder 400. The weld between the shrimp-curved moisture-proof small coal hopper 300 and the wall of the raw coal bunker is sealed.

[0037] Specifically, the Shrimp Curve Moisture-proof Small Coal Hopper 300 is made of stainless steel, which gives it good moisture-proof, corrosion-proof and wear-resistant properties, preventing coal from getting damp and clumping and the hopper wall from being worn by coal. At the same time, the smooth inner wall can reduce the resistance of coal conveying. The shrimp-curved moisture-proof small coal hopper 300 has its inlet directly connected to the inside of raw coal bins A (100) and B (200), ensuring smooth coal entry. Its outlet is coaxially aligned with the inlet of the newly added coal feeder 400, allowing for seamless coal transport without corner obstructions, reducing coal accumulation at the interface, and improving transport efficiency. The shrimp-curved moisture-proof small coal hopper 300 is sealed at the welded joints with the raw coal bin walls, preventing coal leakage and waste, and blocking external humid air and dust from entering the raw coal bins, ensuring the dryness and cleanliness of the coal inside.

[0038] In this embodiment: the discharge end of the self-regulating coal flow device 430 is a downwardly inclined arc-shaped structure. The lower edge of the discharge end of the self-regulating coal flow device 430 is closely attached to and seamlessly connected with the upper edge of the corresponding original coal feeder outlet. The housing of the self-regulating coal flow device 430 and the housing of the corresponding original coal feeder are fixedly connected by a connecting rod 431. The two ends of the connecting rod 431 are welded and fixed to the self-regulating coal flow device 430 and the original coal feeder, respectively.

[0039] Specifically, the downward-sloping arc-shaped discharge end of the self-regulating coal flow device 430 is closely attached to and seamlessly connected with the upper edge of the corresponding original coal feeder outlet, so that the coal conveyed by the new coal feeder 400 can smoothly slide into the original coal feeder, effectively preventing coal spillage. At the same time, the seamless structure prevents external debris from entering the conveying path, ensuring the cleanliness of the coal. Moreover, the arc-shaped structure can adaptively adjust the guiding angle according to the coal flow rate. When the flow rate is too large, it disperses the impact force of the coal and prevents overflow. When the flow rate is small, it guides the coal to fall accurately into the conveying channel, realizing adaptive guiding. The two ends of the connecting rod 431 are welded and fixed to the housing of the self-regulating coal flow device 430 and the housing of the original coal feeder, respectively, so that the self-regulating coal flow device 430 is firmly positioned directly above the outlet of the original coal feeder, which offsets the vibration load of the newly added coal feeder 400 and prevents its position from shifting. The arc-shaped discharge end can also reduce the resistance of coal conveying and improve the overall coal blending efficiency.

[0040] In this embodiment: the outer cover of the newly added coal feeder 400 is equipped with a stainless steel sealing cover 900, and a stainless steel sealing glass 910 is embedded in the stainless steel sealing cover 900. The connection gaps between the stainless steel sealing cover 900 and the raw coal bunker wall and the operating platform 800 are all sealed.

[0041] Specifically, the stainless steel sealing cover 900 is installed on the outside of the new coal feeder 400, covering the connection between the new coal feeder 400, the connection between the bidirectional pneumatic slide gate 410 and the new coal feeder 400, and the connection between the double-cylinder self-changing rail sealing slide gate 420 and the new coal feeder 400, forming a closed protective space. The connection gaps between the stainless steel sealing cover 900 and the walls of raw coal bunkers A 100 and B 200, as well as the operating platform 800, are all sealed to effectively prevent external dust and humid air from entering the equipment. This prevents the conveying components of the newly added coal feeder 400 and the cylinder components of the bidirectional pneumatic slide gate 410 from being affected by moisture, corrosion, and dust accumulation. The stainless steel sealing glass 910 is embedded in the stainless steel sealing cover 900. Operators can observe the sealing status of the coal conveying and connection parts inside the equipment through the stainless steel sealing glass 910 without opening the stainless steel sealing cover, thus completing daily inspections and reducing the number of times the sealing structure needs to be opened. Furthermore, the stainless steel cover and glass are wear-resistant and corrosion-resistant, making them suitable for power plant environments and reducing equipment maintenance frequency and costs.

[0042] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0043] As is known from common technical knowledge, this invention can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this invention or its equivalents are included in this invention.

Claims

1. A coal feeder for raw coal bunker, comprising an A raw coal bunker (100) and a B raw coal bunker (200) arranged adjacently, characterized in that, The discharge end of the A raw coal bunker (100) is fixedly connected to the A raw coal feeder (110), and the discharge end of the B raw coal bunker (200) is fixedly connected to the B raw coal feeder (210). Both the A raw coal bunker (100) and the B raw coal bunker (200) are fixedly welded with small, curved, moisture-proof coal hoppers (300). The small, curved, moisture-proof coal hoppers (300) of the B raw coal bunker (200) extend horizontally toward the A raw coal bunker (100), and the discharge end of the small, curved, moisture-proof coal hoppers (300) of the B raw coal bunker (200) is located directly above the outlet of the A raw coal feeder (110). The small, curved, moisture-proof coal hoppers (300) of the A raw coal bunker (100) extend horizontally toward the B raw coal bunker (200), and the discharge end of the small, curved, moisture-proof coal hoppers (300) of the A raw coal bunker (100) is located directly above the outlet of the B raw coal feeder (210). Each of the above-mentioned shrimp-curve moisture-proof small coal hoppers (300) has a fixed connection at the discharge end to a new coal feeder (400). There are two new coal feeders (400) arranged in a stacked manner. The two new coal feeders (400) are fixedly connected to the original coal bin wall through a bracket. A bidirectional pneumatic gate (410) is fixedly installed at the inlet end of the new coal feeder (400). The bidirectional pneumatic gate (410) is sealed and connected to the discharge port of the shrimp-curve moisture-proof small coal hopper (300). A double-cylinder self-changing track sealing gate (420) is fixedly installed at the outlet end of the new coal feeder (400). The discharge end of the double-cylinder self-changing track sealing gate (420) is fixedly sealed and connected to a self-regulating coal flow device (430). The discharge end of the self-regulating coal flow device (430) is located directly above the outlet of the original coal feeder. The walls of both raw coal bunker A (100) and raw coal bunker B (200) are fixedly equipped with support and reinforcement components (500) that are connected to the shrimp-shaped moisture-proof small coal hopper (300). The outlet of the new coal feeder (400) and the walls of raw coal bunker A (100) and raw coal bunker B (200) are fixedly equipped with unblocking and flow-assisted components (600). A compartment control cabinet (700) is set up on one side of raw coal bunker A (100) and raw coal bunker B (200). The compartment control cabinet (700) is electrically connected to the bidirectional pneumatic slide gate (410), the double-cylinder self-changing rail sealing slide gate (420), the new coal feeder (400) and the unblocking and flow-assisted components (600) through electrical lines.

2. The coal feeding device for a raw coal bunker according to claim 1, characterized in that, The supporting and reinforcing component (500) includes three T-shaped ring beams (510). The three T-shaped ring beams (510) are spaced apart vertically and welded to the walls of raw coal bunker A (100) and raw coal bunker B (200). The inner wall of the T-shaped ring beam (510) is welded and fixed to the outer wall of the shrimp-curved moisture-proof small coal hopper (300). Reinforcing ribs (520) are welded between the T-shaped ring beam (510) and the walls of the raw coal bunker.

3. A coal feeding device for a raw coal bunker according to claim 2, characterized in that, The support and reinforcement assembly (500) also includes a support plate (530) and a support beam (540). One side of the support plate (530) is fixed to the wall of the raw coal bunker by chemical bolts, and the other side of the support plate (530) is welded to the support beam (540). The support beam (540) is arranged along the horizontal direction of the raw coal bunker. Three support plates (530) are spaced apart on a single support beam (540). Vertical stiffeners (550) are also welded between the T-shaped ring beam (510) and the shrimp-curve moisture-proof small coal hopper (300).

4. A coal feeding device for a raw coal bunker according to claim 1, characterized in that, The unblocking and flow-aiding component (600) includes multiple bin wall vibrating hammers (610). Some of the bin wall vibrating hammers (610) are installed at the outlet of the new coal feeder (400), and the remaining bin wall vibrating hammers (610) are installed in three layers (upper, middle and lower) on the bin walls of raw coal bin A (100) and raw coal bin B (200). The unblocking and flow-assisted assembly (600) also includes an unblocking air hammer pipeline (620) and a sealing air pipeline (630). One end of the unblocking air hammer pipeline (620) is connected to the plant's compressed air, and the other end of the unblocking air hammer pipeline (620) is connected to the vibrating air hammers (610) of each silo wall through a stainless steel pipe. One end of the sealing air pipeline (630) is connected to a sealing air source, and the other end of the sealing air pipeline (630) is connected to the A original coal feeder (110) and the B original coal feeder (210) through a carbon steel pipe.

5. A coal feeding device for a raw coal bunker according to claim 1, characterized in that, The bidirectional pneumatic slide gate (410) is connected to an air source pipeline (411). The air source pipeline (411) is made of 304 stainless steel and has a specification of DN10. One end of the air source pipeline (411) is connected to the instrument compressed air, and the other end of the air source pipeline (411) is connected to the cylinder of the bidirectional pneumatic slide gate (410). A pressure regulating valve, a quick exhaust valve, a pressure gauge and a filter cup are installed on the air source pipeline (411) in sequence. The air source pipeline of the double cylinder self-changing track sealing slide gate (420) and the air source pipeline of the bidirectional pneumatic slide gate (410) are arranged in the same way.

6. A coal feeding device for a raw coal bunker according to claim 1, characterized in that, An operating platform (800) is also fixedly installed on the outside of the A raw coal bunker (100) and the B raw coal bunker (200). The height of the operating platform (800) is adapted to the installation height of the new coal feeder (400). The platform surface of the operating platform (800) is set directly opposite the new coal feeder (400), the two-way pneumatic slide gate (410) and the double-cylinder self-changing rail sealing slide gate (420).

7. A coal feeding device for a raw coal bunker according to claim 1, characterized in that, The compartment control cabinet (700) is equipped with a terminal block (710). The compartment control cabinet (700) integrates an inlet gate electrical control circuit (720), an outlet gate electrical control circuit (730), and a blockage clearing and flow assisting electrical control circuit (740). The inlet gate electrical control circuit (720) is electrically connected to the bidirectional pneumatic gate (410) through the terminal block (710). The outlet gate electrical control circuit (730) is electrically connected to the dual-cylinder self-changing rail sealing gate (420) through the terminal block (710). The blockage clearing and flow assisting electrical control circuit (740) is electrically connected to the blockage clearing and flow assisting assembly (600) through the terminal block (710).

8. A coal feeding device for a raw coal bunker according to claim 1, characterized in that, The shrimp-curved moisture-proof small coal hopper (300) is made of stainless steel. The inlet of the shrimp-curved moisture-proof small coal hopper (300) is connected to the inside of the raw coal silo. The outlet of the shrimp-curved moisture-proof small coal hopper (300) is coaxially set with the inlet end of the newly added coal feeder (400). The weld between the shrimp-curved moisture-proof small coal hopper (300) and the wall of the raw coal silo is sealed.

9. A coal feeding device for a raw coal bunker according to claim 1, characterized in that, The discharge end of the self-regulating coal flow device (430) is a downwardly inclined arc structure. The lower edge of the discharge end of the self-regulating coal flow device (430) is closely connected to the upper edge of the corresponding original coal feeder outlet. The housing of the self-regulating coal flow device (430) and the housing of the corresponding original coal feeder are fixedly connected by a connecting rod (431). The two ends of the connecting rod (431) are respectively welded and fixed to the self-regulating coal flow device (430) and the original coal feeder.

10. A coal feeding device for a raw coal bunker according to claim 1, characterized in that, The outer side of the newly added coal feeder (400) is equipped with a stainless steel sealing cover (900), and a stainless steel sealing glass (910) is embedded in the stainless steel sealing cover (900). The connection gaps between the stainless steel sealing cover (900) and the raw coal bunker wall and the operating platform (800) are all sealed.

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