Coal feeding device for boiler of thermal power generation

Abstract

The utility model belongs to coal feeding equipment technical field especially a boiler coal feeder for thermal power generation, in view of the existing coal feeder exists because the coal granularity of transmission is uneven, thereby causes the problem of easy to block the coal feeding equipment body output, present and propose the following scheme, it includes: coal feeding equipment body, screening device is located at the top of coal feeding equipment body for the qualified coal particle carries out screening work, crushing device is located at the top of screening device for the big lump coal carries out the crushing work, synchronous transmission mechanism is located at the front side of crushing device, the utility model not only effectively overcomes many defects of the existing boiler coal feeder for thermal power generation, and through the synchronous crushing screening and automatic dredging backflow's synergistic innovation, provides a kind of efficient, stable, energy-saving coal feeding scheme, it is applicable to the large-scale coal feeding scene of thermal power boiler, has very high practical value and popularization prospect.

Description

Technical Field

[0001] This application relates to the field of coal feeding equipment technology, and in particular to a coal feeding device for a boiler used in thermal power generation. Background Technology

[0002] The boiler coal feeding device is one of the core pieces of equipment in a thermal power generation system, and its performance directly affects boiler combustion efficiency, power generation stability, and environmental performance. Existing boiler coal feeding devices for thermal power generation suffer from the following technical deficiencies in practical applications: Firstly, the uneven particle size of the coal, with large pieces of coal not being fully crushed and directly entering the boiler, easily leads to incomplete combustion, reduces thermal efficiency, and generates a large amount of smoke and dust. Secondly, the screening and crushing are poorly coordinated. The screening and crushing devices often use independent power sources, which can easily lead to asynchronous operation, resulting in unqualified particles being missed or over-crushed, thus increasing energy consumption. Third, coal blockage is frequent. During the feeding process of the hopper, the coal is prone to bridging and blockage due to moisture and caking, which requires manual unblocking and affects the continuity of coal feeding. Fourth, the recycling of substandard coal is inconvenient. Large pieces of coal that have been screened out need to be manually transported to a crushing device for reprocessing, which is cumbersome and labor-intensive. Chinese utility model patent CN215570575U discloses a boiler coal feeding device, including a hopper with a discharge port at the lower end and a screw conveyor at the discharge port. A frame is installed outside the hopper, and a weighing mechanism is installed on the upper end of the frame. A hopper is installed above the weighing mechanism, and a support is installed on the upper end of the weighing mechanism. The left end of the hopper is rotatably connected to the support. A first telescopic mechanism is rotatably installed between the end of the hopper away from the support and the upper surface of the weighing mechanism. The screw conveyor extends above the hopper and is equipped with a discharge pipe corresponding to the upper and lower ends of the hopper. This utility model uses the screw conveyor to transport coal from the hopper to the hopper. The screw conveyor is turned off according to the reading of the weighing mechanism. Then, the first telescopic mechanism is controlled to extend, causing the hopper to rotate around the support. At the same time, the second telescopic mechanism is controlled to extend, pushing the push plate to drop the coal in the hopper, thereby realizing automatic feeding of the boiler.

[0003] Existing coal feeding devices suffer from the problem of clogging the output port of the coal feeding device due to uneven coal particle size. To address this issue, a coal feeding device for a boiler used in thermal power generation is proposed. Utility Model Content

[0004] In order to improve the problem of existing coal feeding devices causing blockage of the coal feeding device's output port due to uneven coal particle size, this application provides a coal feeding device for a boiler used in thermal power generation.

[0005] The technical solution of the coal feeding device for a boiler used in thermal power generation provided in this application is as follows: A coal feeding device for a boiler used in thermal power generation includes: a coal feeding device body; The screening device is located on top of the coal feeding equipment and is used to screen qualified coal particles. The crushing device, located on top of the screening device, is used to crush large pieces of coal. The synchronous transmission mechanism is located at the front of the crushing device and is used to drive the screening device and the crushing device to operate; A storage device, located on top of the crushing device, is used for storing coal. The reflux device, located on the left side of the screening device, is used to guide unqualified coal back into the storage device. A dredging device, located on top of the storage device, is used to expedite the coal feeding process.

[0006] Preferably, the screening device includes a crushing chamber, multiple return springs, multiple guide rods, and a screening plate. The crushing chamber is installed at the inlet of the coal feeding equipment body. A liner is fixedly connected to the inner wall of the crushing chamber. The two ends of the multiple return springs and multiple guide rods are respectively fixedly connected to the top of the liner and the bottom of the screening plate. A cam is rotatably connected inside the crushing chamber, and the cam abuts against the bottom of the screening plate.

[0007] Preferably, the pulverizing device includes two rotating gears and an annular internal gear. Two pulverizing rollers are rotatably arranged inside the pulverizing chamber. The two rotating gears are fixedly connected to the rear ends of the two pulverizing rollers respectively. Both rotating gears are arranged inside the annular internal gear, and both rotating gears mesh with the inner gear ring of the annular internal gear. The annular internal gear is connected to the pulverizing chamber. A rotating motor is installed on the front side of the pulverizing chamber. The two pulverizing rollers are symmetrically distributed about the longitudinal central axis of the annular internal gear. The output shaft of the rotating motor is fixedly connected to the front side of the pulverizing roller located on the right.

[0008] Preferably, the synchronous transmission mechanism includes a synchronous toothed belt, a synchronous toothed pulley is fixedly connected to the front end of the crushing roller, another synchronous toothed pulley is connected to the synchronous toothed pulley through the synchronous toothed belt, and the other synchronous toothed pulley is fixedly connected to the front end of the cam.

[0009] Preferably, the storage device includes a hopper and a monitoring module. The output port of the hopper is equipped with a discharge check valve, and the output port of the discharge check valve is fixedly connected to the input port of the crushing chamber. The monitoring module is installed on the front side of the hopper, and the top of the hopper is equipped with a feed check valve.

[0010] Preferably, the reflux device includes a guide trough, a coal suction pump, and a guide pipe. The coal suction pump is installed on the left side of the hopper, a collecting frame is installed on the left side of the discharge port of the crushing chamber, a guide trough is installed at the bottom of the discharge port of the crushing chamber, the two ends of the guide pipe are fixedly connected to the output port of the collecting frame and the input port of the coal suction pump, respectively, the output port of the coal suction pump is fixedly connected to the reflux frame, and the reflux frame is fixedly connected to the top of the hopper.

[0011] Preferably, the unblocking device includes a buffer plate connected to the inner wall of the hopper, and an electromagnetic vibrator is installed at the bottom of the hopper, with the output end of the electromagnetic vibrator fixedly connected to the buffer plate.

[0012] In summary, this application includes at least one of the following beneficial technical effects: 1. Symmetrical gear crushing combined with cam vibration screening ensures uniform and controllable coal particle size: The crushing device drives the right crushing roller through a rotating motor, which in turn drives the left crushing roller to rotate symmetrically in opposite directions via a rotating gear meshing with an inner ring gear, achieving efficient crushing of large pieces of coal; the synchronous transmission mechanism drives the cam to rotate, which, together with the return spring and guide rod, causes the screening plate to vibrate up and down, accurately screening qualified particles; the crushing and screening work together to improve work efficiency. 2. Electromagnetic vibration unblocking + buffer material guiding, with significant anti-clogging effect: The electromagnetic vibrator of the unblocking device drives the buffer plate to vibrate at high frequency, breaking down coal lumps and bridging structures, and accelerating material feeding; the buffer plate can slow down the falling speed of coal and avoid impacting the crushing device.

[0013] 3. Automatic negative pressure reflux recycling and unqualified coal recycling: The unqualified large coal pieces screened out enter the feed pipe through the guide chute and collection frame. The coal suction pump generates negative pressure to transport them to the reflux frame and reintroduce them into the hopper for secondary crushing. The whole process is automated recycling and secondary crushing.

[0014] This invention not only effectively overcomes many defects of existing coal feeding devices for thermal power generation boilers, but also provides a highly efficient, stable, and energy-saving coal feeding solution through the synergistic innovation of synchronous crushing and screening and automatic dredging and reflux. It is suitable for large-scale coal feeding scenarios of thermal power generation boilers and has high practical value and promotion prospects. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure in Embodiment 1 of this application; Figure 2 This is a schematic diagram of the internal structure in Embodiment 1 of this application; Figure 3 This is a schematic diagram of the crushing device structure in Embodiment 1 of this application; Figure 4 This is a schematic diagram of the screening device structure in Embodiment 1 of this application.

[0016] Reference numerals: 1. Reflux frame; 2. Feed check valve; 3. Monitoring module; 4. Hopper; 5. Discharge check valve; 6. Crushing chamber; 7. Rotating motor; 8. Synchronous toothed belt; 9. Synchronous toothed pulley; 10. Coal feeding equipment body; 11. Coal suction pump; 12. Guide pipe; 13. Buffer plate; 14. Electromagnetic vibrator; 15. Crushing roller; 16. Collection frame; 17. Rotating gear; 18. Ring internal gear; 19. Guide groove; 20. Screening plate; 21. Cam; 22. Liner; 23. Return spring; 24. Guide rod. Detailed Implementation

[0017] Example 1 The following is in conjunction with the appendix Figures 1-4 The first embodiment of this application will be described in further detail.

[0018] A coal feeding device for a boiler used in thermal power generation includes: a coal feeding device body 10; A screening device is located on top of the coal feeding equipment body 10 and is used to screen qualified coal particles. The crushing device, located on top of the screening device, is used to crush large pieces of coal. The synchronous transmission mechanism is located at the front of the crushing device and is used to drive the screening device and the crushing device to operate; A storage device, located on top of the crushing device, is used for storing coal. The reflux device, located on the left side of the screening device, is used to guide unqualified coal back into the storage device. A dredging device, located on top of the storage device, is used to expedite the coal feeding process.

[0019] In this embodiment, the screening device includes a crushing chamber 6, multiple return springs 23, multiple guide rods 24, and a screening plate 20. The crushing chamber 6 is installed at the input port of the coal feeding equipment body 10. A liner 22 is fixedly connected to the inner wall of the crushing chamber 6. The two ends of the multiple return springs 23 and the multiple guide rods 24 are respectively fixedly connected to the top of the liner 22 and the bottom of the screening plate 20. A cam 21 is rotatably connected inside the crushing chamber 6. The cam 21 abuts and overlaps with the bottom of the screening plate 20. Specifically, the rotation of cam 21 causes the screening plate 20 to vibrate up and down, the reset spring 23 assists in resetting, and the guide rod 24 ensures the smooth movement of the screening plate, thereby realizing the screening of coal particles.

[0020] In this embodiment, the crushing device includes two rotating gears 17 and an annular internal gear 18. Two crushing rollers 15 are rotatably arranged inside the crushing chamber 6. The two rotating gears 17 are fixedly connected to the rear ends of the two crushing rollers 15 respectively. The two rotating gears 17 are arranged inside the annular internal gear 18, and the two rotating gears 17 mesh with the inner gear ring of the annular internal gear 18. The annular internal gear 18 is connected to the crushing chamber 6. A rotating motor 7 is installed on the front side of the crushing chamber 6. The two crushing rollers 15 are symmetrically distributed about the longitudinal central axis of the annular internal gear 18. The output shaft of the rotating motor 7 is fixedly connected to the front side of the crushing roller 15 located on the right side. Specifically, the rotating motor 7 is started, which drives the right crushing roller 15 to rotate. The crushing roller 15 drives the inner ring gear 18 to rotate through the rotating gear 17 located at the rear. The inner ring gear 18 drives another rotating gear 17 and another crushing roller 15 to rotate. The two crushing rollers 15 rotate to crush large pieces of coal.

[0021] In this embodiment, the synchronous transmission mechanism includes a synchronous toothed belt 8, a synchronous toothed pulley 9 is fixedly connected to the front end of the crushing roller 15, another synchronous toothed pulley 9 is connected to the synchronous toothed pulley 8 through the synchronous toothed belt 8, and the other synchronous toothed pulley 9 is fixedly connected to the front end of the cam 21. Specifically, when the crushing roller 15 on the left rotates, it drives the synchronous toothed pulley 9 to rotate. The synchronous toothed pulley 9 drives another synchronous toothed pulley 9 and the cam 21 to rotate synchronously through the synchronous toothed belt 8. A tensioning pulley can be set on the slack side of the synchronous toothed belt 8.

[0022] In this embodiment, the storage device includes a hopper 4 and a monitoring module 3. A discharge check valve 5 is installed at the output port of the hopper 4. The output port of the discharge check valve 5 is fixedly connected to the input port of the crushing chamber 6. The monitoring module 3 is installed on the front side of the hopper 4. A feed check valve 2 is installed on the top of the hopper 4. Specifically, hopper 4 stores coal, monitoring module 3 monitors the storage capacity, and a one-way valve controls the coal feeding and discharging.

[0023] In this embodiment, the reflux device includes a guide trough 19, a coal suction pump 11, and a guide pipe 12. The coal suction pump 11 is installed on the left side of the hopper 4. A collection frame 16 is installed on the left side of the discharge port of the crushing chamber 6. A guide trough 19 is installed at the bottom of the discharge port of the crushing chamber 6. The two ends of the guide pipe 12 are fixedly connected to the output port of the collection frame 16 and the input port of the coal suction pump 11, respectively. A reflux frame 1 is fixedly connected to the output port of the coal suction pump 11. The reflux frame 1 is fixedly connected to the top of the hopper 4. Specifically, substandard coal enters the collection frame 16 through the guide chute 19. Then, the coal suction pump 11 is started, which transports the coal to the return frame 1 through the guide pipe 12, and then returns it to the hopper 4 through the return frame 1.

[0024] In this embodiment, the unblocking device includes a buffer plate 13, which is connected to the inner wall of the hopper 4. An electromagnetic vibrator 14 is installed at the bottom of the hopper 4, and the output end of the electromagnetic vibrator 14 is fixedly connected to the buffer plate 13. Specifically, the electromagnetic vibrator 14 is activated, which causes the buffer plate 13 to vibrate, accelerating the coal feeding and preventing blockage.

[0025] The implementation principle of a coal feeding device for a boiler used in thermal power generation according to an embodiment of this application is as follows: 1. Equipment initialization and feeding: Open the feed one-way valve 2, add coal into the hopper 4, and the monitoring module 3 displays the coal storage in real time; when the hopper 4 is full, close the feed one-way valve 2, open the discharge one-way valve 5, and control the coal to enter the crushing chamber 6.

[0026] 2. Synchronous operation of crushing and screening: Start the rotating motor 7 to drive the two crushing rollers 15 to rotate in opposite directions to crush the coal; the synchronous transmission mechanism drives the cam 21 to rotate, and the screening plate 20 vibrates up and down, screening out qualified particles into the coal feeding equipment body 10, and unqualified particles fall into the guide chute 19.

[0027] 3. Unblocking and reflux treatment: Start the electromagnetic vibrator 14, and the buffer plate 13 vibrates to prevent the hopper from being blocked; start the coal suction pump 11, and unqualified coal is collected through the collection frame 16, the guide pipe 12 and the reflux frame 1, and then returned to the hopper 4 for secondary crushing.

[0028] 4. Coal feeding completion and maintenance: After the boiler coal feeding is completed, turn off the rotating motor 7, electromagnetic vibrator 14 and coal suction pump 11; clean the residual coal in the crushing chamber 6 and screening plate 20, check the wear of the crushing roller 15, replace the vulnerable parts, and restore the equipment to the standby state.

[0029] Example 2 The difference between this embodiment and Embodiment 1 is that a heating module is installed on the coal feeding equipment body 10, which can remove moisture from the coal and improve the combustion effect.

[0030] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A coal feeding device for a boiler used in thermal power generation, comprising: The main body of the coal feeding equipment (10) is characterized by: A screening device is located on the top of the coal feeding equipment body (10) and is used to screen qualified coal particles. The crushing device, located on top of the screening device, is used to crush large pieces of coal. The synchronous transmission mechanism is located at the front of the crushing device and is used to drive the screening device and the crushing device to operate; A storage device, located on top of the crushing device, is used for storing coal. The reflux device, located on the left side of the screening device, is used to guide unqualified coal back into the storage device. A dredging device, located on top of the storage device, is used to expedite the coal feeding process.

2. The coal feeding device for a boiler used in thermal power generation according to claim 1, characterized in that: The screening device includes a crushing chamber (6), multiple return springs (23), multiple guide rods (24), and a screening plate (20). The crushing chamber (6) is installed at the inlet of the coal feeding equipment body (10). A liner (22) is fixedly connected to the inner wall of the crushing chamber (6). The two ends of the multiple return springs (23) and the multiple guide rods (24) are fixedly connected to the top of the liner (22) and the bottom of the screening plate (20), respectively. A cam (21) is rotatably connected inside the crushing chamber (6). The cam (21) abuts against the bottom of the screening plate (20).

3. A coal feeding device for a boiler used in thermal power generation according to claim 2, characterized in that: The crushing device includes two rotating gears (17) and an annular internal gear (18). The crushing chamber (6) is equipped with two crushing rollers (15) that rotate inside. The two rotating gears (17) are fixedly connected to the rear ends of the two crushing rollers (15) respectively. The two rotating gears (17) are arranged inside the annular internal gear (18), and the two rotating gears (17) mesh with the inner gear ring of the annular internal gear (18). The annular internal gear (18) is connected to the crushing chamber (6). A rotating motor (7) is installed on the front side of the crushing chamber (6). The two crushing rollers (15) are symmetrically distributed about the longitudinal central axis of the annular internal gear (18). The output shaft of the rotating motor (7) is fixedly connected to the front side of the crushing roller (15) located on the right side.

4. A coal feeding device for a boiler used in thermal power generation according to claim 3, characterized in that: The synchronous transmission mechanism includes a synchronous toothed belt (8), and a synchronous toothed pulley (9) is fixedly connected to the front end of the crushing roller (15). The synchronous toothed pulley (9) is connected to another synchronous toothed pulley (9) through the synchronous toothed belt (8). The other synchronous toothed pulley (9) is fixedly connected to the front end of the cam (21).

5. A coal feeding device for a boiler used in thermal power generation according to claim 4, characterized in that: The storage device includes a hopper (4) and a monitoring module (3). The output port of the hopper (4) is equipped with a discharge check valve (5). The output port of the discharge check valve (5) is fixedly connected to the input port of the crushing chamber (6). The monitoring module (3) is installed on the front side of the hopper (4). The top of the hopper (4) is equipped with a feed check valve (2).

6. A coal feeding device for a boiler used in thermal power generation according to claim 5, characterized in that: The reflux device includes a guide trough (19), a coal suction pump (11), and a guide pipe (12). The coal suction pump (11) is installed on the left side of the hopper (4). A collection frame (16) is installed on the left side of the discharge port of the crushing chamber (6). A guide trough (19) is installed at the bottom of the discharge port of the crushing chamber (6). The two ends of the guide pipe (12) are fixedly connected to the output port of the collection frame (16) and the input port of the coal suction pump (11), respectively. A reflux frame (1) is fixedly connected to the output port of the coal suction pump (11). The reflux frame (1) is fixedly connected to the top of the hopper (4).

7. A coal feeding device for a boiler used in thermal power generation according to claim 6, characterized in that: The unblocking device includes a buffer plate (13), which is connected to the inner wall of the hopper (4). An electromagnetic vibrator (14) is installed at the bottom of the hopper (4), and the output end of the electromagnetic vibrator (14) is fixedly connected to the buffer plate (13).

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