Anti-overtemperature coal feeding device of power generation boiler
By setting up an isolation chamber and impeller rotation isolation at the coal outlet of the coal feeder, combined with baffle vibration and cold air supply, the problem of high-temperature flue gas backflow is solved, and the coal feeder is protected against overheating and provides uniform coal supply.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-19
- Publication Date
- 2026-05-01
AI Technical Summary
The existing coal feeder for power generation boilers lacks a mechanism to prevent high-temperature backflow, which causes high-temperature flue gas from the boiler to flow back into the coal feeder, damaging the equipment.
A coal feed pipe is installed at the coal outlet of the coal feeder, and an impeller in an isolation chamber is installed between its two ends. The rotation of the impeller achieves the isolation of the coal feed pipe. Combined with the vibration of the baffle plate and the supply of cold air, high-temperature hot air is prevented from entering the coal feeder.
It effectively prevents the coal feeder from overheating, ensures uniform coal feeding, avoids equipment damage, and achieves continuous and stable coal supply.
Smart Images
Figure CN121953335A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of power generation equipment technology, specifically referring to a coal feeding device for a power generation boiler that prevents overheating. Background Technology
[0002] The coal feeder for a power plant boiler is a key auxiliary device in the boiler system of a coal-fired power plant. Its main function is to continuously, stably, and controllably transport fuel from the raw coal bunker to the boiler mill or furnace. By precisely adjusting the coal feeding rate, it ensures that the fuel and air are fully mixed and combusted to meet the boiler load requirements and guarantee stable steam production and parameters.
[0003] If the boiler becomes unstable during the use of the coal feeder, a positive pressure will instantly form inside the boiler furnace. Moreover, the current coal feeder lacks a mechanism to prevent high-temperature backflow, which causes high-temperature flue gas from the boiler to flow back into the coal feeder through the coal drop pipe, thereby baking the belt, burning the sensors, and causing serious damage to the equipment. Summary of the Invention
[0004] In view of the above situation and to overcome the defects of the prior art, the purpose of the present invention is to provide a coal feeding device for a power generation boiler that prevents overheating, so as to at least partially solve the problems mentioned in the background art.
[0005] The technical solution adopted by this invention is as follows: This invention proposes a coal feeding device for a power generation boiler that prevents overheating, comprising: The coal feeder is equipped with a coal outlet; A coal feed pipe is located below the coal outlet, and the top end of the coal feed pipe is connected to the coal outlet. The coal feeding pipe is provided with an isolation chamber between its two ends. The isolation chamber is equipped with an impeller whose axis is perpendicular to the coal falling direction, so that the isolation chamber is divided into multiple coal feeding chambers. The two side walls of the isolation chamber are set as arcs with an inner diameter that matches the rotation diameter of the impeller, and the arc length of the side walls of the isolation chamber is greater than the arc length at the opening of the coal feeding chamber, so that the two ends of the coal feeding pipe are not connected to each other. The outer side of the coal feeding pipe is equipped with a motor for driving the impeller to rotate, so that multiple coal feeding chambers are sequentially and cyclically connected to both ends of the coal feeding pipe.
[0006] Furthermore, a baffle plate is connected to the bottom end of the coal feeding pipe, and multiple evenly distributed coal leakage holes are opened on the baffle plate.
[0007] Furthermore, a vibration unit is connected to the bottom of the partition, and the vibration unit is configured to drive the partition to reciprocate along the coal falling direction.
[0008] Furthermore, an adjustment plate is provided on the partition plate, and multiple adjustment holes adapted to the coal leakage hole are opened on the adjustment plate. The coal leakage hole and the adjustment holes form a material discharge channel. A cylinder capable of driving the adjustment plate to slide is provided on the outside of the coal feeding pipe. By sliding the adjustment plate, the overlapping area of the coal leakage hole and the adjustment holes is adjusted, so that the size of the material discharge channel is adjustable.
[0009] Furthermore, elastic strips are provided at both ends of the partition that connect to the coal feeding pipe, and the partition is movably connected to the coal feeding pipe through the elastic strips.
[0010] Furthermore, a cold air inlet pipe is connected to one side of the coal feeder, and the cold air inlet pipe is connected to an external cold air supply device, so that the cold air inlet pipe can deliver cold air into the coal feeder.
[0011] Furthermore, an exhaust pipe is connected to one side of the coal outlet, and the exhaust pipe is connected to an external induced draft fan.
[0012] Furthermore, a filter box is installed inside the coal outlet, and the exhaust pipe is connected to the interior of the filter box.
[0013] Furthermore, the filter box includes a gas collecting plate and a filter screen. The gas collecting plate is configured as a rectangular shell with one end open. The filter screen is fixed to the open end of the gas collecting plate, and the suction pipe is connected to the gas collecting plate.
[0014] Furthermore, a temperature sensor is installed at the bottom of the coal feeding pipe, and the detection end of the temperature sensor extends into the interior of the coal feeding pipe.
[0015] Beneficial effects: 1. By setting a coal feeding pipe at the coal outlet and setting an isolation chamber between the two ends of the coal feeding pipe, an impeller is installed in the isolation chamber. The rotation of the impeller enables continuous coal supply. At the same time, the two ends of the coal feeding pipe are always isolated by the impeller. When the boiler combustion is unstable and positive pressure is generated, the high-temperature hot air can be isolated by the isolation chamber to prevent the high-temperature hot air from entering the coal feeder and prevent the coal feeder from overheating.
[0016] 2. By installing a baffle at the bottom of the coal feeding pipe, a buffer zone for coal falling is formed above the baffle. The coal falling from the coal feeding chamber is buffered by the baffle. Through the vibration of the baffle, the coal above the baffle can fall at a uniform speed through the coal leakage hole, avoiding unstable boiler combustion caused by uneven coal feeding. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure of a coal feeding device for a power generation boiler that is designed to prevent overheating, according to an embodiment of the present invention. Figure 2This is a schematic diagram of the internal structure of the coal feeding pipe in a coal feeding device for an overheat-proof power generation boiler according to an embodiment of the present invention. Figure 3 This is a schematic diagram showing the installation position of the filter box in a coal feeding device for an overheat-proof power generation boiler according to an embodiment of the present invention. Figure 4 This is a schematic diagram of the filter box structure in a coal feeding device for an overheat-proof power generation boiler according to an embodiment of the present invention; Figure 5 This is a schematic diagram showing the positions of the baffle and regulating plate in a coal feeding device for an overheat-proof power generation boiler according to an embodiment of the present invention. Figure 6 This is a schematic diagram showing the installation position of the vibration unit in a coal feeding device for an overheat-proof power generation boiler according to an embodiment of the present invention. Figure 7 This is a schematic diagram showing the positions of the coal leakage hole and the regulating hole in a coal feeding device for an overheat-proof power generation boiler according to an embodiment of the present invention.
[0018] Among them, 1. Coal feeder; 11. Coal inlet; 12. Coal outlet; 13. Cold air inlet pipe; 14. Exhaust pipe; 2. Coal feed pipe; 21. Isolation chamber; 22. Impeller; 201. Coal feed chamber; 3. Motor; 4. Partition plate; 41. Elastic strip; 401. Coal leakage hole; 5. Vibration unit; 6. Adjusting plate; 601. Adjusting hole; 7. Cylinder; 8. Filter box; 81. Air collecting plate; 82. Filter screen; 9. Temperature sensor.
[0019] The accompanying drawings are provided to further understand the embodiments and form part of the specification. They are used together with the embodiments for explanation and do not constitute a limitation on the embodiments. Detailed Implementation
[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection.
[0021] In the description of the embodiments, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments 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 the embodiments.
[0022] Combination Figure 1As shown, this embodiment of the invention provides a coal feeding device for a power generation boiler that prevents overheating, including a coal feeder 1 and a coal feeding pipe 2. The coal feeder 1 has a coal inlet 11 and a coal outlet 12 at its two ends, respectively. The coal inlet 11 faces upward and is connected to the coal bunker, while the coal outlet 12 faces downward. The top end of the coal feeding pipe 2 is connected to the coal outlet 12, and the bottom end of the coal feeding pipe 2 is connected to the coal-using equipment.
[0023] The coal feeder 1 is equipped with a conveyor belt. Coal entering through the coal inlet 11 falls onto the conveyor belt and is transported to the coal outlet 12. The coal is then output from the coal outlet 12 into the coal feeding pipe 2 and falls into the coal-using equipment through the coal feeding pipe 2.
[0024] Combination Figure 2 As shown, an isolation chamber 21 is provided between the two ends of the coal feeding pipe 2. An impeller 22 with its axis perpendicular to the coal falling direction is provided inside the isolation chamber 21, so that the isolation chamber 21 is divided into multiple independent coal feeding chambers 201. A motor 3 is provided on the outside of the coal feeding pipe 2. The output shaft of the motor 3 extends into the inside of the coal feeding pipe 2 and is connected to the drive impeller 22. The motor 3 drives the impeller 22 to rotate, so that the multiple coal feeding chambers 201 can be connected to the two ends of the coal feeding pipe 2 in sequence.
[0025] Thus, when the coal feeding chamber 201 rotates to connect with the top end of the coal feeding pipe 2, the coal conveyed by the coal feeder 1 can fall into the coal feeding chamber 201. As the coal feeding chamber 201 rotates, when the coal feeding chamber 201 rotates to connect with the bottom end of the coal feeding pipe 2, the coal in the coal feeding chamber 201 can fall into the coal-using equipment. By setting multiple circulating rotating coal feeding chambers 201, continuous coal supply to the coal-using equipment can be achieved.
[0026] Furthermore, the two side walls of the isolation chamber 21 are set as arcs with inner diameters that match the rotation diameter of the impeller 22, and the arc length of the side wall of the isolation chamber 21 is greater than the arc length at the opening of the coal feeding chamber 201. When the coal feeding chamber 201 rotates to the side wall of the isolation chamber 21, it can be closed by the side wall of the isolation chamber 21. Therefore, when the impeller 22 rotates, the two ends of the coal feeding pipe 2 will not be connected through the coal feeding chamber 201, so that the two ends of the coal feeding pipe 2 are always in a state of mutual isolation.
[0027] Thus, during coal feeding, the impeller 22 is driven to rotate by the motor 3. When the coal feeding chamber 201 rotates to connect with the top of the coal feeding pipe 2, the coal conveyed by the coal feeder 1 can fall into the coal feeding chamber 201. As the coal feeding chamber 201 rotates, when the coal feeding chamber 201 rotates to connect with the bottom of the coal feeding pipe 2, the coal in the coal feeding chamber 201 can fall into the coal-using equipment. Through multiple rotating coal feeding chambers 201, continuous coal supply to the coal-using equipment is achieved. At the same time, the two ends of the coal feeding pipe 2 are always in a state of mutual isolation. When the boiler combustion is unstable and positive pressure is generated, the high-temperature hot air can be isolated by the isolation chamber 21 to prevent the high-temperature hot air from entering the coal feeder 1 and prevent the coal feeder 1 from overheating.
[0028] Combination Figure 2 and Figure 6 As shown, a baffle 4 is connected to the bottom end of the coal feeding pipe 2. Multiple evenly distributed coal leakage holes 401 are opened on the baffle 4. Under the obstruction of the baffle 4, a buffer zone for coal falling is formed above the baffle 4. The coal falling from the coal feeding chamber 201 is blocked and buffered by the baffle 4. A vibration unit 5 is connected to the bottom of the baffle 4. The vibration unit 5 is configured to drive the baffle 4 to vibrate back and forth along the coal falling direction. With the vibration of the baffle 4, the coal above the baffle 4 can fall at a uniform speed through the coal leakage holes 401, avoiding unstable boiler combustion caused by uneven coal feeding.
[0029] In a specific embodiment, the vibration unit 5 includes two horizontally arranged vibration motors with parallel rotating shafts. The two vibration motors rotate in opposite directions. When the two vibration motors rotate synchronously, the horizontal forces can cancel each other out, and the vertical forces can be combined, thereby enabling the vibration unit 5 to reciprocate along the coal falling direction (the vertical direction of the agent) with the drive partition 4.
[0030] Furthermore, by controlling the vibration frequency of the vibration unit 5 to drive the partition 4, when the vibration frequency of the partition 4 increases, the amount of coal falling through the coal leakage hole 401 increases, and when the vibration frequency of the partition 4 decreases, the amount of coal falling through the coal leakage hole 401 decreases.
[0031] Thus, during coal feeding, the impeller 22 is driven to rotate by the motor 3. When the coal feeding chamber 201 rotates to connect with the top of the coal feeding pipe 2, the coal conveyed by the coal feeder 1 can fall into the coal feeding chamber 201. As the coal feeding chamber 201 rotates, when it rotates to connect with the bottom of the coal feeding pipe 2, the coal in the coal feeding chamber 201 can fall into the buffer zone formed on the baffle 4. Multiple rotating coal feeding chambers 201 continuously supply coal and the coal falls into the buffer zone for temporary storage. The vibration unit 5 drives the baffle 4 to vibrate continuously. As the baffle 4 vibrates, the coal above the baffle 4 can fall at a constant speed through the coal leakage hole 401, avoiding uneven coal feeding and unstable boiler combustion, and realizing continuous coal supply to the coal-using equipment. At the same time, the two ends of the coal feeding pipe 2 are always isolated from each other. When the boiler combustion is unstable and positive pressure is generated, the high-temperature hot air can be isolated by the isolation chamber 21 to prevent the high-temperature hot air from entering the coal feeder 1 and preventing the coal feeder 1 from overheating.
[0032] Combination Figure 1As shown, a temperature sensor 9 is installed at the bottom of the coal feed pipe 2. The detection end of the temperature sensor 9 extends into the interior of the coal feed pipe 2. The temperature sensor 9 monitors the temperature at the bottom of the coal feed pipe 2 in real time. When the boiler combustion is stable, the temperature monitored by the temperature sensor 9 at different times tends to be consistent. However, when the boiler combustion is unstable, the temperature monitored by the temperature sensor 9 at different times fluctuates greatly. Specifically, when the coal feed is too large, the temperature rises and when the coal feed is too small, the temperature decreases.
[0033] Thus, when the temperature sensor 9 detects that the temperature at different times tends to be consistent, the vibration frequency of the vibration unit 5 driving the baffle 4 is kept constant, thereby keeping the coal feed rate consistent. When the temperature sensor 9 detects that the temperature is decreasing, the vibration frequency of the vibration unit 5 driving the baffle 4 is increased, thereby increasing the coal feed rate. When the temperature sensor 9 detects that the temperature is too high, the vibration frequency of the vibration unit 5 driving the baffle 4 is decreased, thereby decreasing the coal feed rate and maintaining the combustion power of the boiler.
[0034] It should be noted that when the vibration frequency of the baffle 4 increases and the coal feed rate is increased, the coal feeder speed of the coal feeder 1 and the rotation speed of the impeller 22 are increased accordingly to maintain the coal feed demand; when the vibration frequency of the baffle 4 decreases and the coal feed rate is reduced, the coal feeder speed of the coal feeder 1 and the rotation speed of the impeller 22 are decreased accordingly to avoid coal blockage.
[0035] Combination Figure 5 and Figure 6 As shown, elastic strips 41 are provided at both ends where the partition 4 is connected to the coal feeding pipe 2. The partition 4 is movably connected to the coal feeding pipe 2 through the elastic strips 41. The setting of the elastic strips 41 allows the partition 4 to move and thus be driven to vibrate by the vibration unit 5. At the same time, the elastic strips 41 play a buffering role, reducing the further transmission of vibration.
[0036] Combination Figure 5 , Figure 6 and Figure 7 As shown, an adjusting plate 6 is provided on the partition plate 4. The adjusting plate 6 has multiple adjusting holes 601 that are adapted to the coal leakage hole 401. The coal leakage hole 401 and the adjusting holes 601 form a material dropping channel. A cylinder 7 that can drive the adjusting plate 6 to slide is provided on the outside of the coal feeding pipe 2. By sliding the adjusting plate 6, the overlapping area of the coal leakage hole 401 and the adjusting holes 601 is adjusted, so that the size of the material dropping channel can be adjusted, thereby controlling the coal dropping speed.
[0037] Thus, when the vibration unit 5 is adjusted to its minimum power and the coal feed rate is still high, the coal feed rate can be further reduced by adjusting the material drop channel, thereby increasing the adjustable range of the coal feed rate.
[0038] It should be noted that under normal conditions, the coal leakage hole 401 and the regulating hole 601 completely overlap, the material feeding channel is in its maximum state, and the coal feed rate is adjusted only by the vibration unit 5.
[0039] Combination Figure 1 As shown, a cold air inlet pipe 13 is connected to one side of the coal inlet 11. The cold air inlet pipe 13 is connected to an external cold air supply device, so that the cold air inlet pipe 13 can deliver cold air into the coal feeder 1 to cool the inside of the coal feeder 1.
[0040] Furthermore, an exhaust pipe 14 is connected to one side of the coal outlet 12. The exhaust pipe 14 is connected to an external induced draft fan. The external induced draft fan extracts heat from the coal outlet 12 through the exhaust pipe 14, preventing heat conducted by the boiler from further penetrating into the coal feeder 1.
[0041] At the same time, under the action of the exhaust pipe 14, the cold air transported through the cold air inlet pipe 13 can flow to the coal outlet 12, so that the cold air can flow in the coal feeder 1 and be fully cooled.
[0042] Combination Figure 3 As shown, a filter box 8 is installed inside the coal outlet 12, and an exhaust pipe 14 is connected to the inside of the filter box 8. When the exhaust pipe 14 is under negative pressure, the coal dust generated inside the coal feeder 1 can flow to the exhaust pipe 14. After being filtered by the filter box 8, the coal can adhere to the outside of the filter box 8, thereby reducing dust emissions.
[0043] It should be noted that the extraction pipe 14 is connected to the pulse jet device through a three-way valve. After a certain period of time, the extraction pipe 14 is connected to the pulse jet device through the three-way valve, and the pulse jet is used to backflush the filter box 8, so that the attached coal powder is removed and falls into the coal feeding chamber 201.
[0044] In a specific embodiment, the filter box 8 includes a gas collecting plate 81 and a filter screen 82. The gas collecting plate 81 is a rectangular shell with one end open. The filter screen 82 is fixed to the open end of the gas collecting plate 81. The suction pipe 14 is connected to the gas collecting plate 81. During filtration, the suction pipe 14 is in a negative pressure suction state, and the coal powder is filtered to the outside of the filter screen 82. During pulse backflushing, the suction pipe 14 is in a positive pressure state, and the coal powder attached to the filter screen 82 falls off under the action of positive pressure.
[0045] The working principle of this invention: Coal entering through the coal inlet 11 falls onto the conveyor belt inside the coal feeder 1, and is transported to the coal outlet 12 by the conveyor belt, and then output from the coal outlet 12 into the coal feeding pipe 2. During coal feeding, the impeller 22 is driven to rotate by the motor 3. When the coal feeding chamber 201 rotates to connect with the top end of the coal feeding pipe 2, the coal transported by the coal feeder 1 can fall into the coal feeding chamber 201. As the coal feeding chamber 201 rotates, when the coal feeding chamber 201 rotates to connect with the bottom end of the coal feeding pipe 2, the coal in the coal feeding chamber 201 can fall onto the buffer formed by the partition 4. Within the zone, multiple rotating coal feeding chambers 201 continuously supply coal, which falls into the buffer zone for temporary storage. The vibration unit 5 drives the partition 4 to vibrate continuously. As the partition 4 vibrates, the coal above the partition 4 can fall uniformly through the coal leakage hole 401, avoiding unstable boiler combustion caused by uneven coal feeding and achieving continuous coal supply to the coal-using equipment. At the same time, the two ends of the coal feeding pipe 2 are always in a state of mutual isolation. When the boiler combustion is unstable and positive pressure is generated, the high-temperature hot air can be isolated by the isolation chamber 21 to prevent the high-temperature hot air from entering the coal feeder 1 and prevent the coal feeder 1 from overheating.
[0046] When the temperature sensor 9 detects that the temperature at different times tends to be consistent, the vibration frequency of the vibration unit 5 driving the baffle 4 is kept constant, thereby keeping the coal feed rate consistent. When the temperature sensor 9 detects that the temperature is decreasing, the vibration frequency of the vibration unit 5 driving the baffle 4 is increased, thereby increasing the coal feed rate. When the temperature sensor 9 detects that the temperature is too high, the vibration frequency of the vibration unit 5 driving the baffle 4 is decreased, thereby decreasing the coal feed rate and maintaining the combustion power of the boiler.
[0047] The external induced draft fan extracts heat from the coal outlet 12 through the exhaust pipe 14, preventing the heat conducted by the boiler from further penetrating into the coal feeder 1. At the same time, under the action of the exhaust pipe 14, the cold air transported through the cold air inlet pipe 13 can flow towards the coal outlet 12, allowing the cold air to flow inside the coal feeder 1 and fully cool down.
[0048] In summary, by setting a coal feeding pipe 2 at the coal outlet 12 and setting an isolation chamber 21 between the two ends of the coal feeding pipe 2, an impeller 22 is installed in the isolation chamber 21. Through the rotation of the impeller 22, continuous coal supply is achieved. At the same time, the two ends of the coal feeding pipe 2 are always isolated by the impeller 22. When the boiler combustion is unstable and positive pressure is generated, the high-temperature hot air can be isolated by the isolation chamber 21 to prevent the high-temperature hot air from entering the coal feeder 1 and prevent the coal feeder 1 from overheating.
[0049] By setting a baffle 4 at the bottom of the coal feeding pipe 2, a buffer zone for coal falling is formed above the baffle 4 under the obstruction of the baffle 4. The coal falling from the coal feeding chamber 201 is blocked and buffered by the baffle 4. Through the vibration of the baffle 4, the coal above the baffle 4 can fall uniformly through the coal leakage hole 401, avoiding unstable boiler combustion caused by uneven coal feeding.
[0050] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0051] The embodiments have been described above, and such description is not restrictive. The figures shown are only one embodiment, and the actual structure is not limited to this. In short, if a person skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the inventive spirit, such design should fall within the scope of protection.
Claims
1. A coal feeding device for a power generation boiler with overheat protection, characterized in that, include: The coal feeder (1) is equipped with a coal outlet (12); The coal feed pipe (2) is located below the coal outlet (12), and the top end of the coal feed pipe (2) is connected to the coal outlet (12); Among them, an isolation chamber (21) is provided between the two ends of the coal feeding pipe (2), and an impeller (22) with its axis perpendicular to the coal falling direction is provided in the isolation chamber (21), so that the isolation chamber (21) is divided into multiple coal feeding chambers (201). The two side walls of the isolation chamber (21) are set as arcs with an inner diameter that matches the rotation diameter of the impeller (22), and the arc length of the side wall of the isolation chamber (21) is greater than the arc length at the opening of the coal feeding chamber (201), so that the two ends of the coal feeding pipe (2) are not connected to each other. The outer side of the coal feeding pipe (2) is provided with a motor (3) for driving the impeller (22) to rotate, so that multiple coal feeding chambers (201) are sequentially and cyclically connected to both ends of the coal feeding pipe (2).
2. The overheat protection coal feeding device for power generation boilers according to claim 1, characterized in that: The bottom end of the coal feeding pipe (2) is connected to a partition (4), and the partition (4) has a plurality of evenly distributed coal leakage holes (401).
3. The overheat protection coal feeding device for power generation boilers according to claim 2, characterized in that: The bottom of the partition (4) is connected to a vibration unit (5), which is configured to drive the partition (4) to reciprocate along the coal falling direction.
4. The overheat protection coal feeding device for power generation boilers according to claim 2, characterized in that: An adjusting plate (6) is provided on the partition (4). The adjusting plate (6) has multiple adjusting holes (601) that are adapted to the coal leakage hole (401). The coal leakage hole (401) and the adjusting holes (601) form a material discharge channel. A cylinder (7) that can drive the adjusting plate (6) to slide is provided on the outside of the coal feeding pipe (2). By sliding the adjusting plate (6), the overlapping area of the coal leakage hole (401) and the adjusting holes (601) is adjusted, so that the size of the material discharge channel is adjustable.
5. The overheat protection coal feeding device for power generation boilers according to claim 2, characterized in that: The two ends of the partition (4) connected to the coal feeding pipe (2) are provided with elastic strips (41), and the partition (4) is movably connected to the coal feeding pipe (2) through the elastic strips (41).
6. The overheat protection coal feeding device for power generation boilers according to claim 1, characterized in that: A cold air inlet pipe (13) is connected to one side of the coal feeder (1). The cold air inlet pipe (13) is connected to an external cold air supply device, so that the cold air inlet pipe (13) can deliver cold air into the coal feeder (1).
7. The overheat protection coal feeding device for power generation boilers according to claim 1, characterized in that: A suction pipe (14) is connected to one side of the coal outlet (12), and the suction pipe (14) is connected to an external induced draft fan.
8. The overheat protection coal feeding device for power generation boilers according to claim 7, characterized in that: A filter box (8) is installed inside the coal outlet (12), and the exhaust pipe (14) is connected to the inside of the filter box (8).
9. The overheat protection coal feeding device for power generation boilers according to claim 8, characterized in that: The filter box (8) includes an air collecting plate (81) and a filter screen (82). The air collecting plate (81) is a rectangular shell with one end open. The filter screen (82) is fixed to the open end of the air collecting plate (81). The suction pipe (14) is connected to the air collecting plate (81).
10. The overheat protection coal feeding device for power generation boilers according to claim 1, characterized in that: A temperature sensor (9) is installed at the bottom of the coal feed pipe (2), and the detection end of the temperature sensor (9) extends into the interior of the coal feed pipe (2).