Gangue combustion waste heat recovery device and method based on grate cooler

Abstract

The invention discloses a coal gangue combustion waste heat recovery device and method based on a grate cooler, and belongs to the technical field of waste heat recovery. The coal gangue combustion waste heat recovery device comprises a gas collecting pipe, a conveying pipe and a centralizing pipe, positioning plates are connected to the upper portion of the interior of the centralizing pipe, and a two-way lead screw is rotationally connected between the positioning plates; the outer side of the bidirectional lead screw is in threaded connection with symmetrically-arranged inner threaded sleeves, and the outer sides of the inner threaded sleeves are provided with casing pipes. A water storage box is connected above one end, far away from the concentration pipe, of the sleeve; an L-shaped water outlet pipe is connected to the middle part below one side, far away from the sleeve, of the water storage box; the arc-shaped scraping plate can push dust impurities to the middle of the conveying pipe and collect and clean the dust impurities, the situation that the dust impurities adhere to the inner wall of the conveying pipe and consequently heat exchange of the pipe wall is reduced is avoided, meanwhile, resistance increase of the inner wall of the conveying pipe can be avoided, the dust accumulation problem can be effectively solved, the intercept of a heating surface is increased, and dust accumulation bridging is prevented. And the operation time is prolonged, and the interval of blowing-out and ash removal is reduced.

Description

Technical Field

[0001] This invention belongs to the field of waste heat recovery technology of grate coolers, specifically relating to a waste heat recovery device and method for coal gangue combustion based on a grate cooler. Background Technology

[0002] The waste heat recovery device for coal gangue combustion in the grate cooler uses medium-temperature hot air from the rear section of the grate cooler as the combustion air for the coal gangue combustion furnace. The high-temperature hot air generated by the combustion of coal gangue is sent to the waste heat power generation boiler at the kiln head to generate electricity. At the same time, the low-temperature air generated by the cooling of coal slag is sent to the dust collector, realizing the synergistic effect of coal gangue calorific value utilization and waste heat power generation, reducing cement electricity costs and improving energy utilization efficiency.

[0003] Patent application CN219607734U discloses a high-efficiency cooling grate cooler. A large amount of hot waste gas generated at the tail end of the grate cooler is collected and utilized through a waste heat recovery device, avoiding resource waste. While the aforementioned grate cooler can recover and utilize waste heat, in actual use, the hot waste gas is discharged through an exhaust pipe. During operation, the grate plates pushing the high-temperature clinker generate a large amount of dust and impurities. Because the hot waste gas contains a high amount of water and dust, directly sending it into the exhaust pipe without filtration causes dust and impurities to adhere to the inner wall of the exhaust pipe, reducing heat exchange. Over time, this leads to dust bridging and increased boiler resistance, requiring frequent boiler shutdowns for ash removal, thus reducing work efficiency.

[0004] Patent application CN222279379U discloses a waste heat recovery boiler for a grate cooler. The boiler features a conveying assembly with a conveying pipe connected to the boiler for easy recovery of waste heat gas. A storage frame is installed at the lower end, and a uniform rod inside the frame evenly conveys the gas. A connecting pipe at the lower end filters cement powder from the waste heat gas through a filter plate inside. While this boiler can recover waste heat from the grate cooler and filter the waste heat gas using a first and second filter plate, in practice, the boiler cannot clean the first and second filter plates during operation. Over time, a large amount of dust and impurities accumulate on the first and second filter plates, causing blockage and reducing the waste heat gas throughput, thus affecting the work process. Replacing the first and second filter plates requires shutting down the boiler, reducing efficiency. Summary of the Invention

[0005] One objective of this invention is to solve the problem in the prior art where hot exhaust gas is directly sent into the exhaust pipe without filtration, causing dust and impurities to adhere to the inner wall of the exhaust pipe, requiring frequent boiler shutdowns for cleaning, which reduces work efficiency. Another objective is to solve the problem that after prolonged use, the first and second filter plates accumulate a large amount of dust and impurities, leading to blockage, reduced waste heat gas throughput, and impact on the work process. Furthermore, replacing the first and second filter plates requires shutting down the boiler, further reducing work efficiency. This invention provides a waste heat recovery device and method for coal gangue combustion based on a grate cooler.

[0006] The objective of this invention can be achieved through the following technical solutions: A waste heat recovery device for coal gangue combustion based on a grate cooler includes a gas collecting pipe, a conveying pipe, and a concentrating pipe. Positioning plates are connected to the upper part of the concentrating pipe, and a bidirectional screw is rotatably connected between the positioning plates. Symmetrically arranged internally threaded sleeves are threaded to the outer sides of the bidirectional screws, and sleeves are installed on the outer sides of the internally threaded sleeves. A water storage box is connected to the upper part of the sleeve away from the concentrating pipe. An L-shaped water outlet pipe is connected to the lower center of the water storage box on the side away from the sleeve. A circular pipe is connected to the end of the water outlet pipe away from the water storage box, and multiple atomizing nozzles arranged in a circular array are connected to the outside of the circular pipe. A ring frame is connected to the outer side of the sleeve near the concentrating pipe. An annular rotating plate is rotatably connected inside the annular frame. Four arc-shaped plates arranged in a circular array are set on the outer side of the annular rotating plate. Four sets of third springs arranged in a circular array are connected between the annular rotating plate and the arc-shaped plates, corresponding to the position of the second outer sleeve. Arc-shaped scrapers are connected to the outer side of each arc-shaped plate. Both ends of the bidirectional lead screw pass through the positioning plate and are connected to the first bevel gear. The outer side of the first bevel gear is meshed with the second bevel gear. The middle part of both sides of the second bevel gear is connected to the first reciprocating lead screw and the second reciprocating lead screw respectively. The outer side of the first reciprocating lead screw and the second reciprocating lead screw are threadedly connected to the moving plate. A cleaning scraper is connected to the side of the moving plate near the filter plate.

[0007] Preferably, the outer side of the sleeve near the concentrator is connected to three sets of fixed plates arranged in a circular array. Each set of fixed plates is rotatably connected to a first rotating rod, and each first rotating rod is connected to the sleeve by an arc-shaped spring.

[0008] Preferably, a partition plate is connected to the middle of the water storage box, and a piston is provided above the partition plate inside the water storage box. A pull rod is connected to the middle of the side of the piston away from the round tube. The end of the pull rod away from the piston passes through the water storage box and is connected to the outer shell. A movable block is slidably connected inside the outer shell. A U-shaped plate is connected to the upper end of the movable block, and the U-shaped plate is rotatably connected to the first rotating rod located above.

[0009] Preferably, the end of the water storage box furthest from the sleeve is connected to an inlet pipe, and the middle of the delivery pipe is provided with a main water pipe corresponding to the inlet pipe. The lower end of the main water pipe is connected to a water filling pipe, and both ends of the water filling pipe are connected to water filling plugs.

[0010] Preferably, a stepped groove block is connected inside the end of the water inlet pipe away from the water storage box, a sealing block is provided inside the water inlet pipe at the position corresponding to the stepped groove block, a second limiting rod is connected to the middle of the side of the sealing block away from the stepped groove block, a limiting plate is connected inside the water inlet pipe at the end corresponding to the second limiting rod away from the sealing block, and a second spring is connected between the sealing block and the limiting plate.

[0011] Preferably, a toothed ring is connected to the middle of the inner side of the annular rotating plate, and a planar gear is meshed inside the toothed ring. A first sprocket is connected to the side of the toothed ring away from the first rotating rod. A second sprocket is threadedly connected to the position of the first sprocket on the bidirectional lead screw. The end of the second sprocket near the internal threaded sleeve is rotatably connected to the internal threaded sleeve through a positioning ring. A chain meshes between the first sprocket and the second sprocket.

[0012] Preferably, a second rotating rod is symmetrically arranged at the position of the filter plate in the central tube. A symmetrically arranged eccentric block is connected to the outer side of each second rotating rod. A positioning sleeve is connected to both ends of the second rotating rod inside the central tube. The second rotating rod is rotatably connected in the positioning sleeve. A torsion spring is connected between the second rotating rod and the positioning sleeve.

[0013] The present invention also provides a method for recovering waste heat from coal gangue combustion based on a grate cooler, comprising the following steps: hot gas is discharged from the waste air outlet of the grate cooler body, the hot gas is concentrated and sent into the conveying pipe through the gas collecting pipe, and the hot gas is conveyed into the recovery pipe through the conveying pipe.

[0014] Specifically, the cleaning operation of the filter plate and the conveying pipe includes the following steps: S10: The motor drives the second reciprocating screw to rotate in conjunction with the bidirectional lead screw, causing the two sets of first and second bevel gears to rotate, which in turn causes the moving plate and the cleaning scraper to move back and forth, scraping away the impurities adhering to the filter plate.

[0015] S11: The moving plate reciprocates and presses the eccentric block. The eccentric block drives the second rotating rod to rotate, so that the torsion spring stores the restoring force. When the moving plate moves past the eccentric block, the eccentric block resets and strikes the filter plate.

[0016] S12: When the bidirectional screw rotates and moves the internal threaded sleeve toward the middle of the conveying pipe, the first rotating rod rotates away from the sleeve, driving the moving block and the outer shell to move toward the middle of the sleeve. The movement of the outer shell will pull the connecting rod to move the piston, squeezing the gas and clean water into the round pipe and spraying it out through the atomizing nozzle.

[0017] S13: Under the action of the third spring, the arc-shaped scraper fits against the inner wall of the conveying pipe. The movement of the sleeve drives the arc-shaped scraper to move, scraping off the dust and impurities adhering to the inner wall of the conveying pipe and pushing the dust and impurities to the middle of the conveying pipe.

[0018] S14: The movement of the sleeve drives the second sprocket to move and rotate. The rotation of the second sprocket, in conjunction with the chain and the first sprocket, causes the planar gear to rotate. The rotation of the planar gear drives the toothed ring to rotate, and the rotation of the toothed ring drives the arc-shaped scraper to rotate, which can more evenly clean the inner wall of the conveying pipe.

[0019] S15: After the sleeve moves to the middle of the conveying pipe, the arc-shaped scraper pushes the dust and impurities to the middle of the conveying pipe. When the double-acting screw stops rotating, the solenoid valve starts and opens the drain pipe. When the double-acting screw continues to rotate, the solenoid valve starts and closes the drain pipe.

[0020] Specifically, the water filling operation of the water storage box includes the following steps: S20: When the sleeve moves to the middle of the delivery pipe, the water plug enters the inlet pipe, the double-acting screw stops rotating, and the main water pipe injects clean water into the water storage box. After the injection is completed, the main water pipe stops discharging water, and the double-acting screw continues to rotate, causing the water storage box to move towards the end of the delivery pipe. After the water storage box moves, the water plug moves out of the inlet pipe, and under the action of the second spring's restoring force, the sealing block seals the inlet pipe.

[0021] S21: When the sleeve moves toward the end of the delivery pipe, the first rotating rod rotates toward a position closer to the sleeve, and drives the moving block and the outer casing to move away from the middle of the sleeve. The movement of the outer casing will push the pull rod, causing the piston to move and increasing the internal volume of the water storage box.

[0022] The beneficial effects of this invention are: As the sleeve moves towards the middle of the conveying pipe, the inner diameter of the conveying pipe gradually increases. Under the action of the third spring, the arc-shaped scraper remains in contact with the inner wall of the conveying pipe. The movement of the sleeve drives the arc-shaped scraper to move, thereby scraping away the dust and impurities adhering to the inner wall of the conveying pipe. At the same time, the arc-shaped scraper can push the dust and impurities towards the middle of the conveying pipe for collection and cleaning. This prevents dust and impurities from adhering to the inner wall of the conveying pipe, which would reduce the heat exchange of the pipe wall. It also prevents the resistance of the inner wall of the conveying pipe from increasing, effectively reducing the problem of ash accumulation, increasing the cross-section of the heated surface, preventing ash bridging, extending the operating time, and reducing the interval of shutdown and ash cleaning.

[0023] As the sleeve moves, it drives the second sprocket to move and rotate. The rotation of the second sprocket, in conjunction with the chain and the first sprocket, causes the planar gear to rotate. The rotation of the planar gear drives the gear ring to rotate, and the rotation of the gear ring drives the arc-shaped scraper to rotate, thereby cleaning the inner wall of the conveying pipe more evenly and improving cleanliness.

[0024] Driven by a motor, a bidirectional lead screw rotates away from the two sets of first and second bevel gears. The rotation of the second reciprocating lead screw drives the rotation of the first reciprocating lead screw, causing the moving plate and cleaning scraper to reciprocate on the outside of the first and second reciprocating lead screws. During the reciprocating movement of the cleaning scraper, impurities adhering to the filter plate are scraped off. During the reciprocating movement, the moving plate squeezes the eccentric block, causing the eccentric block to drive the second rotating rod to rotate. When the moving plate moves past the eccentric block, the eccentric block returns to its original position under the action of the torsion spring and knocks off the impurities adhering to the filter plate, thus achieving the purpose of cleaning the filter plate. This avoids the filter plate from clogging, which would lead to low heat gas passage efficiency, ensuring the cleanliness of the filter plate and the efficiency of heat gas recovery.

[0025] As the sleeve moves toward the middle of the conveying pipe, the first rotating rod rotates away from the sleeve, driving the moving block and the outer casing to move toward the middle of the sleeve. During the movement, the outer casing pulls the connecting rod, causing the piston to move away from the circular pipe inside the water storage box. During the movement, the piston compresses the gas and clean water into the circular pipe and sprays it out through the atomizing nozzle, so that the clean water can be sprayed out evenly. This wets the inner wall of the conveying pipe and the dust and impurities inside the conveying pipe, allowing the dust and impurities to fall down and preventing them from flying around inside the conveying pipe, making it easier to clean the dust and impurities.

[0026] When the sleeve moves to the middle of the delivery pipe, the water plug enters the inlet pipe, the double-acting screw stops rotating, and the main water pipe injects clean water into the storage box. After the clean water is injected, the main water pipe stops discharging water, and the double-acting screw continues to rotate, causing the storage box to move towards the end of the delivery pipe. After the storage box moves, the water plug moves out of the inlet pipe, and under the action of the second spring's restoring force, the sealing block resets to seal the inlet pipe.

[0027] When the sleeve moves toward the end of the delivery pipe, the first rotating rod rotates toward the position closer to the sleeve and drives the moving block to move away from the middle of the sleeve, thereby driving the outer shell to move away from the middle of the sleeve. During the movement, the outer shell pushes the pull rod, causing the piston to move toward the position closer to the round pipe in the water storage box, thereby increasing the internal volume of the water storage box, so as to be able to accommodate the vaporized clean water and avoid excessive internal pressure in the water storage box. Attached Figure Description

[0028] The invention will now be further described with reference to the accompanying drawings.

[0029] Figure 1 This is a flowchart of the waste heat recovery process of the grate cooler body of the present invention; Figure 2 This is a perspective view of the present invention; Figure 3 This is a perspective view of the other side of the invention; Figure 4 yes Figure 3A magnified view of a section at point A in the middle; Figure 5 yes Figure 3 A magnified view of a section at point B in the middle; Figure 6 yes Figure 3 A magnified view of a section at point C; Figure 7 This is a perspective view of the sleeve in this invention; Figure 8 This is a perspective view of the other side of the sleeve in this invention; Figure 9 This is a cross-sectional view of the water inlet pipe in this invention; Figure 10 yes Figure 9 A magnified view of a section at point D; Figure 11 This is an exploded view of the ring frame in this invention; Figure 12 This is a perspective view of the first bevel gear in this invention; Figure 13 This is a perspective view of the cleaning scraper in this invention; Figure 14 This is a cross-sectional view of the positioning sleeve in this invention.

[0030] In the diagram: 1. Grate cooler body; 2. Positioning plate; 21. Fixing plate; 22. Water storage box; 23. Divider plate; 24. Water inlet pipe; 25. Ring frame; 26. Movable groove; 3. First bevel gear; 31. Second rotating rod; 11. Excess air outlet; 12. Air collection pipe; 13. Centralized pipe; 14. Conveying pipe; 15. Sewage discharge pipe; 16. Solenoid valve; 17. Recovery pipe; 18. Filter plate; 201. Double-acting lead screw; 202. Internally threaded sleeve; 203. First fixing block; 204. Sleeve; 205. First limiting rod; 211. First rotating rod; 212. Roller; 213. Arc-shaped spring; 214. Arc-shaped outer sleeve; 215. Arc-shaped positioning rod; 221. Water outlet pipe; 222. Round pipe; 223. Atomizing nozzle; 231. Piston; 232. Tie rod; 233. Housing; 234. Moving block; 235. U-shaped plate; 236. Slide plate; 237. Slide rail; 241. Platform-shaped groove block; 242. Sealing block; 243. Second limiting rod; 244. Limiting plate; 245. Second spring; 246. Main water pipe; 247. Water inlet pipe; 248. Water inlet plug; 251. Annular rotating plate; 252. Second outer sleeve; 253. Second positioning rod; 254. Arc-shaped plate; 255. Third spring; 256. Arc-shaped scraper; 261. Gear ring; 262. Planar gear; 263. Second fixing block; 264. First sprocket; 265. Third fixing block; 266. Second sprocket; 267. Chain; 268. Positioning ring; 301. Second bevel gear; 302. First reciprocating lead screw; 303. Second reciprocating lead screw; 304. Moving plate; 305. Cleaning scraper; 306. Third limit rod; 307. Motor; 311. Eccentric block; 312. Positioning sleeve; 313. Storage slot; 314. Torsion spring. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see Figure 2 - Figure 3 As shown, a waste heat recovery device for coal gangue combustion based on a grate cooler includes a grate cooler body 1, which is integrated with a sintering machine. The grate cooler body 1 is used to rapidly cool the high-temperature coal gangue produced by the sintering machine.

[0033] An L-shaped gas collecting pipe 12 is connected to the upper flange of the exhaust air outlet 11 of the grate cooler body 1. The gas collecting pipe 12 is used to collect the hot air discharged from the grate cooler body 1.

[0034] A conveying pipe 14 is provided at the end of the gas collecting pipe 12 away from the exhaust air outlet 11. The conveying pipe 14 is used to convey hot gas.

[0035] The conveying pipe 14 consists of symmetrically arranged trapezoidal pipes and a straight pipe. The straight pipe is located between the trapezoidal pipes, and the inner diameter of one end of the trapezoidal pipe is smaller than the inner diameter of the other end of the trapezoidal pipe. This arrangement creates an inclination angle inside the conveying pipe 14, ensuring that the ash-water mixture flows to the middle of the conveying pipe 14 when cleaning dust and impurities.

[0036] Both ends of the conveying pipe 14 are connected to a central pipe 13. The end of the central pipe 13 closest to the gas collecting pipe 12 and furthest from the conveying pipe 14 is connected to the flange of the gas collecting pipe 12. The central pipe 13 is used to connect the conveying pipe 14 and fix the conveying pipe 14.

[0037] A drain pipe 15 is connected to the lower middle part of the conveying pipe 14. A solenoid valve 16 is installed at the middle of the upper end of the drain pipe 15. The drain pipe 15 is used to discharge impurities in the conveying pipe 14, and the solenoid valve 16 is used to control the opening and closing of the drain pipe 15.

[0038] A filter plate 18 is installed on the central pipe 13 near the gas collection pipe 12. The filter plate 18 is used to filter dust and impurities.

[0039] The end of the central pipe 13, which is away from the gas collecting pipe 12 and away from the delivery pipe 14, is connected to the recovery pipe 17, which is used to discharge hot steam.

[0040] In practical use, the waste air outlet 11 of the grate cooler body 1 discharges hot air, and the gas collecting pipe 12 concentrates the hot air into the conveying pipe 14. The hot air conveyed through the conveying pipe 14 enters the recovery pipe 17, allowing the hot air to pass sequentially through the superheater, three evaporators, economizer, and low-pressure evaporator, thereby enabling the recovery and utilization of waste heat. See [link to relevant documentation]. Figure 1 ; After the sleeve 204 moves to the middle of the conveying pipe 14, the arc-shaped scraper 256 pushes the dust and impurities to the middle of the conveying pipe 14. When the double-acting screw 201 stops rotating, the solenoid valve 16 starts and opens the drain pipe 15 to discharge the dust and impurities. When the double-acting screw 201 continues to rotate, the solenoid valve 16 starts and closes the drain pipe 15 to prevent excessive discharge of hot air.

[0041] Please see Figure 3 - Figure 5 , Figure 7 and Figure 8 As shown, each of the central tubes 13 has a positioning plate 2 connected to its upper part. The positioning plate 2 is used to support and fix the bidirectional lead screw 201.

[0042] A two-way lead screw 201 is rotatably connected between the positioning plates 2. The two-way lead screw 201 is used to drive the internal threaded sleeve 202 to move.

[0043] The double-ended lead screw 201 has symmetrically arranged internally threaded sleeves 202 connected to its outer thread. The internally threaded sleeves 202 are used to drive the sleeve 204 to move.

[0044] A sleeve 204 is provided on the outside of the internal threaded sleeve 202. Multiple evenly arranged first fixing blocks 203 are connected between the two ends of the internal threaded sleeve 202 and the sleeve 204. The first fixing blocks 203 are used to support and fix the sleeve 204 on the outside of the internal threaded sleeve 202.

[0045] A first limiting rod 205 is connected between the positioning plates 2. The first fixing block 203 located below is slidably connected to the first limiting rod 205. Through the cooperation of the bidirectional screw 201 and the first limiting rod 205, the internal threaded sleeve 202 can move.

[0046] Three sets of circumferentially arranged fixing plates 21 are connected to the outer side of the sleeve 204 near the end of the central tube 13. The fixing plates 21 are used to determine the rotation position of the first rotating rod 211.

[0047] Each set of fixed plates 21 is rotatably connected to a first rotating rod 211, which is used to drive the outer shell 233 to move.

[0048] The end of the first rotating rod 211 away from the fixed plate 21 is rotatably connected to a roller 212, and the roller 212 is in contact with the inner wall of the conveying pipe 14. The roller 212 is used to reduce the friction between the first rotating rod 211 and the inner wall of the conveying pipe 14, so that the sleeve 204 can move smoothly.

[0049] An arc spring 213 is connected between the first rotating rod 211 and the sleeve 204. The arc spring 213 is used to reset the first rotating rod 211 so that the roller 212 can always be in contact with the inner wall of the conveying pipe 14.

[0050] An arc-shaped outer sleeve 214 is connected to the outer side of the sleeve 204 at the position corresponding to the arc-shaped spring 213, and the arc-shaped outer sleeve 214 is located inside the arc-shaped spring 213. An arc-shaped positioning rod 215 is connected to the first rotating rod 211 at the position corresponding to the arc-shaped outer sleeve 214. The arc-shaped positioning rod 215 is slidably connected inside the arc-shaped outer sleeve 214. Through the cooperation of the arc-shaped outer sleeve 214 and the arc-shaped positioning rod 215, the arc-shaped spring 213 can be prevented from bending. The arc-shaped spring 213, the arc-shaped outer sleeve 214, and the arc-shaped positioning rod 215 are all set around the rotation center of the first rotating rod 211. This arrangement ensures that the first rotating rod 211 can rotate stably.

[0051] In practical use, the rotation of the bidirectional lead screw 201, in conjunction with the first limiting rod 205, enables the internal threaded sleeve 202 to move. The movement of the internal threaded sleeve 202 drives the sleeve 204, the fixing plate 21, and the first rotating rod 211 to move. When the internal threaded sleeve 202 moves towards the middle of the conveying pipe 14, the inner diameter of the conveying pipe 14 gradually increases. Under the action of the restoring force of the arc spring 213, the first rotating rod 211 rotates away from the sleeve 204, so that the roller 212 always fits against the inner wall of the conveying pipe 14. When the internal threaded sleeve 202 moves towards the end of the conveying pipe 14, the inner diameter of the conveying pipe 14 gradually decreases, causing the first rotating rod 211 to rotate closer to the sleeve 204. During the approach process, the first rotating rod 211 will squeeze the arc spring 213. After being squeezed, the arc spring 213 will contract and store the restoring force, preparing for the subsequent reset of the first rotating rod 211.

[0052] Please see Figure 4 , Figure 6 , Figure 10 and Figure 11 As shown, a water storage box 22 is connected above the end of the sleeve 204 away from the central pipe 13. The water storage box 22 is used to store clean water.

[0053] An L-shaped water outlet pipe 221 is connected to the lower center of the water storage box 22 on the side away from the sleeve 204. The water outlet pipe 221 is used to discharge the clean water in the water storage box 22.

[0054] The end of the water outlet pipe 221 away from the water storage box 22 is connected to a round pipe 222. Multiple atomizing nozzles 223 arranged in a circular array are connected to the outside of the round pipe 222. Through the cooperation of the round pipe 222 and the atomizing nozzles 223, the clean water can be sprayed evenly in the delivery pipe 14.

[0055] A partition plate 23 is connected to the middle of the water storage box 22. The partition plate 23 is used to divide the interior of the water storage box 22 into upper and lower layers.

[0056] A piston 231 is provided above the partition plate 23 inside the water storage box 22. The piston 231 is used to squeeze the gas and liquid inside the water storage box 22 so that the gas and liquid inside the water storage box 22 can be sprayed out through the atomizing nozzle 223.

[0057] A pull rod 232 is connected to the middle of the piston 231 on the side away from the circular tube 222. The pull rod 232 is used to pull the piston 231.

[0058] The end of the lever 232 away from the piston 231 passes through the water storage box 22 and is connected to the outer casing 233. The outer casing 233 is used to pull the lever 232 and at the same time to store the moving block 234.

[0059] A movable block 234 is slidably connected inside the outer casing 233, and the movable block 234 is used to drive the outer casing 233 to move.

[0060] The upper end of the movable block 234 is connected to a U-shaped plate 235, and the U-shaped plate 235 is rotatably connected to the first rotating rod 211 located above. The U-shaped plate 235 is used to connect the first rotating rod 211 and the movable block 234, so that the first rotating rod 211 can drive the movable block 234 to move.

[0061] A symmetrically arranged sliding plate 236 is connected to the lower outer side of the outer shell 233. A symmetrically arranged slide rail 237 is connected to the outer side of the sleeve 204 at the position corresponding to the sliding plate 236. The sliding plate 236 is slidably connected in the slide rail 237. Through the cooperation of the sliding plate 236 and the slide rail 237, the position of the outer shell 233 can be limited, so that the outer shell 233 can only move horizontally.

[0062] The end of the water storage box 22 away from the sleeve 204 and away from the outlet pipe 221 is connected to the inlet pipe 24, which is used to add clean water into the water storage box 22.

[0063] The end of the water inlet pipe 24 away from the water storage box 22 is connected to a stepped groove block 241. A sealing block 242 is provided inside the water inlet pipe 24 at the position corresponding to the stepped groove block 241. The sealing block 242 fits into the stepped groove block 241. Through the cooperation of the stepped groove block 241 and the sealing block 242, the water inlet pipe 24 can be sealed.

[0064] A second limiting rod 243 is connected to the middle of the side of the sealing block 242 away from the platform-shaped groove block 241. A limiting plate 244 is connected to the end of the water inlet pipe 24 corresponding to the second limiting rod 243 away from the sealing block 242. The second limiting rod 243 is slidably connected to the middle of the limiting plate 244. Through the cooperation of the second limiting rod 243 and the limiting plate 244, the position of the sealing block 242 can be limited to prevent the sealing block 242 from shifting when moving.

[0065] A second spring 245 is connected between the sealing block 242 and the limiting plate 244, and the second limiting rod 243 is located inside the second spring 245. The second spring 245 is used to reset the sealing block 242 and the second limiting rod 243.

[0066] A main water pipe 246 is provided in the middle of the delivery pipe 14 at the position corresponding to the water inlet pipe 24. The main water pipe 246 passes through the delivery pipe 14 and is used to add clean water into the water storage box 22.

[0067] The lower end of the main water pipe 246 is connected to a water inlet pipe 247. Both ends of the water inlet pipe 247 are connected to water inlet plugs 248. Through the cooperation of the water inlet pipe 247 and the water inlet plugs 248, when the water inlet plugs 248 enter the interior of the water inlet pipe 24, clean water can be added into the water storage box 22.

[0068] In practical use, the clean water in the water storage box 22 is located inside the delivery pipe 14. Because the temperature inside the delivery pipe 14 is high, some of the clean water will vaporize. When the sleeve 204 moves towards the middle of the delivery pipe 14, the first rotating rod 211 rotates away from the sleeve 204, driving the moving block 234 to move towards the middle of the sleeve 204, thereby driving the outer shell 233 to move towards the middle of the sleeve 204. The outer shell 233 moves horizontally with the cooperation of the sliding plate 236 and the slide rail 237. 3. During the movement, pull the lever 232 to move the piston 231 away from the round tube 222 in the water storage box 22. During the movement, the piston 231 squeezes the gas and cleaning water into the round tube 222 and sprays it out through the atomizing nozzle 223, so that the cleaning water can be sprayed out evenly. This wets the inner wall of the conveying pipe 14 and the dust and impurities in the conveying pipe 14, so that the dust and impurities can fall down and prevent the dust and impurities from flying in the conveying pipe 14, making it easier to clean the dust and impurities. When the sleeve 204 moves to the middle of the delivery pipe 14, the water storage box 22 aligns with the water inlet pipe 247. After the water inlet plug 248 is fully inserted into the inlet pipe 24, the double-acting screw 201 will stop rotating. During the process of the water inlet plug 248 entering the inlet pipe 24, the water inlet plug 248 will squeeze the sealing block 242, causing the sealing block 242 to move away from the stepped groove block 241. When the sealing block 242 moves, it will squeeze the second spring 245. The second spring 245 will contract and store restoring force when squeezed. After the sealing block 242 moves, it will no longer seal the inlet pipe 24. After the water inlet plug 248 is fully inserted into the inlet pipe 24, water will flow out of the main water pipe 246 and pass through the water inlet pipe 247 and the water inlet plug. With the cooperation of 248, cleaning water is injected into the water storage box 22 (the water volume in the water storage box 22 is half of the volume of the water storage box 22. The cleaning water in the delivery pipe 14 will cause some of the cleaning water to vaporize. In order to avoid excessive pressure in the water storage box 22, space needs to be reserved to accommodate the gas). After the cleaning water is injected, the main water pipe 246 stops discharging water, and the double-acting screw 201 continues to rotate, causing the water storage box 22 to move towards the end of the delivery pipe 14. After the water storage box 22 moves, the water plug 248 gradually moves out of the water inlet pipe 24. Under the action of the restoring force of the second spring 245, the sealing block 242 gradually resets. With the cooperation of the platform-shaped groove block 241, the water inlet pipe 24 is sealed again. When the sleeve 204 moves toward the end of the delivery pipe 14, the first rotating rod 211 rotates toward a position closer to the sleeve 204, and drives the moving block 234 to move away from the middle of the sleeve 204, thereby driving the outer shell 233 to move away from the middle of the sleeve 204. During the movement, the outer shell 233 pushes the pull rod 232, causing the piston 231 to move toward a position closer to the round pipe 222 inside the water storage box 22, thereby increasing the internal volume of the water storage box 22, so as to be able to accommodate the vaporized clean water and avoid excessive internal pressure in the water storage box 22.

[0069] Please see Figure 4 , Figure 7 , Figure 8 as well as Figure 11 As shown, an annular frame 25 is connected to the outer side of the sleeve 204 near the end of the central pipe 13. The annular frame 25 is used to determine the position of the annular rotating plate 251.

[0070] The ring frame 25 has an internally rotatable ring plate 251, which is used to drive the arc-shaped scraper 256 to move.

[0071] Four arc-shaped plates 254 arranged in a circular array are provided on the outer side of the annular rotating plate 251. Four sets of second outer sleeves 252 arranged in a circular array are connected to the outer side of the annular rotating plate 251 corresponding to the positions of the arc-shaped plates 254. A second positioning rod 253 is slidably connected inside each of the second outer sleeves 252. The end of the second positioning rod 253 away from the second outer sleeve 252 is connected to the arc-shaped plate 254. Through the cooperation of the second outer sleeve 252 and the second positioning rod 253, the position of the arc-shaped plate 254 can be defined.

[0072] Four sets of third springs 255 arranged in a circular array are connected between the annular rotating plate 251 and the arc plate 254 at the position corresponding to the second outer sleeve 252. The second outer sleeve 252 is located inside the third springs 255. The third springs 255 are used to reset the arc plate 254 so that the arc scraper 256 is always in contact with the inner wall of the conveying pipe 14.

[0073] Arc-shaped scrapers 256 are connected to the outer side of the arc-shaped plate 254. The arc-shaped scrapers 256 are used to scrape off impurities that adhere to the inner wall of the conveying pipe 14.

[0074] A toothed ring 261 is connected to the middle of the inner side of the annular rotating plate 251. A movable groove 26 is provided in the middle of the annular frame 25 corresponding to the position of the toothed ring 261. The toothed ring 261 is movably connected in the movable groove 26, which provides the necessary space for the toothed ring 261 to move.

[0075] A planar gear 262 is meshed inside the upper part of the gear ring 261, and the planar gear 262 is used to drive the gear ring 261 to rotate.

[0076] A first sprocket 264 is connected to the side of the toothed ring 261 away from the first rotating rod 211. A second sprocket 266 is threadedly connected to the bidirectional lead screw 201 at the position corresponding to the first sprocket 264. The end of the second sprocket 266 near the internal threaded sleeve 202 is rotatably connected to the internal threaded sleeve 202 through a positioning ring 268. Through the cooperation of the positioning ring 268, the second sprocket 266 can be connected to the internal threaded sleeve 202.

[0077] A chain 267 meshes between the first sprocket 264 and the second sprocket 266. Through the cooperation of the first sprocket 264, the second sprocket 266, the chain 267 and the positioning ring 268, the planar gear 262 can be driven to rotate when the bidirectional lead screw 201 rotates.

[0078] The ring frame 25 has a second fixing block 263 and a third fixing block 265 connected to the positions of the planar gear 262 and the first sprocket 264 on both sides respectively. The planar gear 262 and the first sprocket 264 are located between the second fixing block 263 and the third fixing block 265, and the planar gear 262 and the first sprocket 264 are rotatably engaged with the second fixing block 263 and the third fixing block 265. The second fixing block 263 and the third fixing block 265 are used to support and fix the planar gear 262 and the first sprocket 264.

[0079] In practical use, as the sleeve 204 moves towards the middle of the conveying pipe 14, the inner diameter of the conveying pipe 14 gradually increases. Under the action of the third spring 255, the arc-shaped scraper 256 is always in contact with the inner wall of the conveying pipe 14. The movement of the sleeve 204 drives the arc-shaped scraper 256 to move, thereby scraping away the dust and impurities adhering to the inner wall of the conveying pipe 14. Because the inner diameter of the conveying pipe 14 gradually increases, the conveying pipe 14 will be inclined. Under its own gravity, the dust and impurities can roll towards the middle of the conveying pipe 14. At the same time, the arc-shaped scraper 256 can push the dust and impurities towards the middle of the conveying pipe 14, collect and clean the dust and impurities, and prevent the dust and impurities from adhering to the inner wall of the conveying pipe 14, which would reduce the heat exchange of the pipe wall. At the same time, it can prevent the resistance of the inner wall of the conveying pipe 14 from increasing, effectively reduce the problem of ash accumulation, increase the cross-section of the heated surface, prevent ash bridging, extend the running time, and reduce the interval of shutdown and ash cleaning. As the sleeve 204 moves, it drives the second sprocket 266 to move. Because the second sprocket 266 is threadedly connected to the double-acting screw 201 and rotatably connected to the internally threaded sleeve 202, the movement of the sleeve 204 causes the second sprocket 266 to rotate. The rotation of the second sprocket 266, in conjunction with the chain 267 and the first sprocket 264, causes the planar gear 262 to rotate. The rotation of the planar gear 262 drives the gear ring 261 to rotate, and the rotation of the gear ring 261 drives the arc-shaped scraper 256 to rotate, thereby cleaning the inner wall of the conveying pipe 14 more evenly and improving the cleanliness.

[0080] Please see Figure 5 , Figure 12 - Figure 14 As shown, both ends of the bidirectional lead screw 201 pass through the positioning plate 2 and are connected to the first bevel gear 3. The outer sides of the first bevel gear 3 are meshed with the second bevel gear 301. The middle parts of the two sides of the second bevel gear 301 are respectively connected to the first reciprocating lead screw 302 and the second reciprocating lead screw 303. Through the cooperation of the first bevel gear 3 and the second bevel gear 301, the bidirectional lead screw 201 can be driven to rotate synchronously when the first reciprocating lead screw 302 and the second reciprocating lead screw 303 rotate.

[0081] The end of the second reciprocating screw 303, which is away from the grate cooler body 1, that is away from the second bevel gear 301 passes through the central tube 13 and is connected to the motor 307, which is fixed on the central tube 13. The motor 307 is used to drive the second reciprocating screw, which is away from the grate cooler body 1, to rotate.

[0082] Both the first reciprocating lead screw 302 and the second reciprocating lead screw 303 are threadedly connected to a movable plate 304. A cleaning scraper 305 is connected to the side of the movable plate 304 near the filter plate 18. The cleaning scraper 305 is in contact with the filter plate 18. The movable plate 304 is used to drive the cleaning scraper 305 to reciprocate. The cleaning scraper 305 is used to scrape off impurities adhering to the filter plate 18.

[0083] The central tube 13 is connected to the position of the moving plate 304 by a third limiting rod 306. The moving plate 304 is slidably connected to the third limiting rod 306. The third limiting rod 306 is used to limit the position of the moving plate 304 and prevent the moving plate 304 from deflecting during the movement.

[0084] The central pipe 13 is provided with symmetrically arranged second rotating rods 31 at the position corresponding to the filter plate 18. The outer side of each second rotating rod 31 is connected to symmetrically arranged eccentric blocks 311. The eccentric blocks 311 are used to strike the filter plate 18, thereby ensuring the cleanliness of the filter plate 18.

[0085] The two ends of the central tube 13 corresponding to the second rotating rod 31 are connected to positioning sleeves 312. The second rotating rod 31 is rotatably connected inside the positioning sleeves 312, which are used to support and fix the second rotating rod 31.

[0086] The second rotating rod 31 has storage slots 313 at both ends, which are used to store the torsion spring 314.

[0087] A torsion spring 314 is connected between the second rotating rod 31 and the positioning sleeve 312, and the torsion spring 314 is located in the receiving groove 313. The torsion spring 314 is used to reset the second rotating rod 31.

[0088] This invention also provides a method for recovering waste heat from coal gangue combustion based on a grate cooler, comprising the following steps: See Figure 1 The exhaust air outlet 11 of the grate cooler body 1 discharges hot air, and the air collection pipe 12 concentrates the hot air into the conveying pipe 14.

[0089] S10: The motor 307 drives the second reciprocating screw to rotate in conjunction with the bidirectional screw 201, causing the two sets of first bevel gears 3 and second bevel gears 301 to rotate, causing the moving plate 304 and the cleaning scraper 305 to move back and forth, scraping off the impurities adhering to the filter plate 18.

[0090] S11: The moving plate 304 reciprocates and presses the eccentric block 311. The eccentric block 311 drives the second rotating rod 31 to rotate, so that the torsion spring 314 stores the restoring force. When the moving plate 304 moves past the eccentric block 311, the eccentric block 311 resets and strikes the filter plate 18.

[0091] S12: When the bidirectional lead screw 201 rotates and moves the internal threaded sleeve 202 toward the middle of the conveying pipe 14, the first rotating rod 211 rotates away from the sleeve 204, driving the moving block 234 and the outer shell 233 to move toward the middle of the sleeve 204. The movement of the outer shell 233 will pull the pull rod 232 to move the piston 231, squeezing the gas and clean water into the round pipe 222 and spraying it out through the atomizing nozzle 223.

[0092] S13: Under the action of the third spring 255, the arc-shaped scraper 256 is in contact with the inner wall of the conveying pipe 14. The movement of the sleeve 204 drives the arc-shaped scraper 256 to move, scraping off the dust and impurities adhering to the inner wall of the conveying pipe 14 and pushing the dust and impurities to the middle of the conveying pipe 14.

[0093] S14: The movement of the sleeve 204 drives the second sprocket 266 to move and rotate. The rotation of the second sprocket 266, in conjunction with the chain 267 and the first sprocket 264, causes the planar gear 262 to rotate. The rotation of the planar gear 262 drives the toothed ring 261 to rotate. The rotation of the toothed ring 261 drives the arc-shaped scraper 256 to rotate, which can more evenly clean the inner wall of the conveying pipe 14.

[0094] S15: After the sleeve 204 moves to the middle of the conveying pipe 14, the arc-shaped scraper 256 pushes the dust and impurities to the middle of the conveying pipe 14. When the double-acting screw 201 stops rotating, the solenoid valve 16 starts and opens the drain pipe 15. When the double-acting screw 201 continues to rotate, the solenoid valve 16 starts and closes the drain pipe 15.

[0095] S20: When the sleeve 204 moves to the middle of the delivery pipe 14, the water plug 248 enters the water inlet pipe 24, the double-acting screw 201 stops rotating, and the main water pipe 246 injects clean water into the water storage box 22. After the injection is completed, the main water pipe 246 stops discharging water, and the double-acting screw 201 continues to rotate, causing the water storage box 22 to move towards the end of the delivery pipe 14. After the water storage box 22 moves, the water plug 248 moves out of the water inlet pipe 24, and under the action of the restoring force of the second spring 245, the sealing block 242 seals the water inlet pipe 24.

[0096] S21: When the sleeve 204 moves toward the end of the delivery pipe 14, the first rotating rod 211 rotates toward a position closer to the sleeve 204, and drives the moving block 234 and the outer shell 233 to move away from the middle of the sleeve 204. The movement of the outer shell 233 will push the pull rod 232, causing the piston 231 to move, thereby increasing the internal volume of the water storage box 22.

[0097] It should be noted that, in this document, terms such as “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.

[0098] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A waste heat recovery device for coal gangue combustion based on a grate cooler, comprising a gas collecting pipe (12), a conveying pipe (14), and a concentrating pipe (13), characterized in that: The central tube (13) is connected to a positioning plate (2) at the top inside. A two-way screw (201) is rotatably connected between the positioning plates (2). A symmetrically arranged internal thread sleeve (202) is threaded to the outside of the two-way screw (201). A sleeve (204) is provided on the outside of the internal thread sleeve (202). A water storage box (22) is connected above the end of the sleeve (204) away from the central pipe (13). An L-shaped water outlet pipe (221) is connected to the lower middle part of the side of the water storage box (22) away from the sleeve (204). A round pipe (222) is connected to the end of the water outlet pipe (221) away from the water storage box (22). A plurality of atomizing nozzles (223) arranged in a circular array are connected to the outside of the round pipe (222). The sleeve (204) is connected to an annular frame (25) on the outer side near the central tube (13). An annular rotating plate (251) is rotatably connected inside the annular frame (25). Four arc-shaped plates (254) arranged in a circular array are provided on the outer side of the annular rotating plate (251). Four sets of third springs (255) arranged in a circular array are connected between the annular rotating plate (251) and the arc-shaped plate (254) at the position corresponding to the second outer sleeve (252). Arc-shaped scrapers (256) are connected to the outer side of the arc-shaped plate (254). Both ends of the bidirectional lead screw (201) pass through the positioning plate (2) and are connected to the first bevel gear (3). The outer sides of the first bevel gear (3) are meshed with the second bevel gear (301). The middle parts of the two sides of the second bevel gear (301) are respectively connected to the first reciprocating lead screw (302) and the second reciprocating lead screw (303). The outer sides of the first reciprocating lead screw (302) and the second reciprocating lead screw (303) are threaded with the moving plate (304). The side of the moving plate (304) close to the filter plate (18) is connected to the cleaning scraper (305).

2. The waste heat recovery device for coal gangue combustion based on a grate cooler according to claim 1, characterized in that: The sleeve (204) is connected to the outer side of the end near the central tube (13) by three sets of fixed plates (21) arranged in a circular array. Each set of fixed plates (21) is rotatably connected to a first rotating rod (211), and an arc spring (213) is connected between the first rotating rod (211) and the sleeve (204).

3. A waste heat recovery device for coal gangue combustion based on a grate cooler according to claim 2, characterized in that: A partition plate (23) is connected to the middle of the water storage box (22). A piston (231) is provided above the partition plate (23) inside the water storage box (22). A pull rod (232) is connected to the middle of the side of the piston (231) away from the round tube (222). The end of the pull rod (232) away from the piston (231) passes through the water storage box (22) and is connected to the outer shell (233). A moving block (234) is slidably connected inside the outer shell (233). A U-shaped plate (235) is connected to the upper end of the moving block (234), and the U-shaped plate (235) is rotatably connected to the first rotating rod (211) located above.

4. A waste heat recovery device for coal gangue combustion based on a grate cooler according to claim 3, characterized in that: The water storage box (22) is connected to an inlet pipe (24) at the end away from the sleeve (204) and away from the outlet pipe (221). A main water pipe (246) is set in the middle of the delivery pipe (14) at the position corresponding to the inlet pipe (24). A water filling pipe (247) is connected to the lower end of the main water pipe (246). Both ends of the water filling pipe (247) are connected to water filling plugs (248).

5. A waste heat recovery device for coal gangue combustion based on a grate cooler according to claim 4, characterized in that: The water inlet pipe (24) is connected to a platform-shaped groove block (241) at one end away from the water storage box (22). A sealing block (242) is provided inside the water inlet pipe (24) at the position corresponding to the platform-shaped groove block (241). A second limiting rod (243) is connected to the middle of the side of the sealing block (242) away from the platform-shaped groove block (241). A limiting plate (244) is connected to the end of the water inlet pipe (24) corresponding to the second limiting rod (243) away from the sealing block (242). A second spring (245) is connected between the sealing block (242) and the limiting plate (244).

6. A waste heat recovery device for coal gangue combustion based on a grate cooler according to claim 5, characterized in that: A toothed ring (261) is connected to the middle of the inner side of the annular rotating plate (251). A planar gear (262) meshes inside the toothed ring (261). A first sprocket (264) is connected to the side of the toothed ring (261) away from the first rotating rod (211). A second sprocket (266) is threadedly connected to the position of the double-acting screw (201) corresponding to the position of the first sprocket (264). The end of the second sprocket (266) near the internal threaded sleeve (202) is rotatably connected to the internal threaded sleeve (202) through a positioning ring (268). A chain (267) meshes between the first sprocket (264) and the second sprocket (266).

7. A waste heat recovery device for coal gangue combustion based on a grate cooler according to claim 6, characterized in that: The central tube (13) is provided with a symmetrically arranged second rotating rod (31) at the position corresponding to the filter plate (18). The outer side of the second rotating rod (31) is connected with a symmetrically arranged eccentric block (311). The two ends of the central tube (13) corresponding to the second rotating rod (31) are connected with positioning sleeves (312). The second rotating rod (31) is rotatably connected in the positioning sleeve (312). A torsion spring (314) is connected between the second rotating rod (31) and the positioning sleeve (312).

8. A method for recovering waste heat from coal gangue combustion based on a grate cooler, applicable to the waste heat recovery device for coal gangue combustion based on a grate cooler as described in any one of claims 1-7, characterized in that, Includes the following steps: The residual air outlet (11) of the grate cooler body (1) discharges hot air, and the gas collection pipe (12) concentrates the hot air into the conveying pipe (14). The hot air conveyed through the conveying pipe (14) enters the recovery pipe (17).

9. A method for recovering waste heat from coal gangue combustion based on a grate cooler according to claim 8, characterized in that: Cleaning of the filter plate (18) and the delivery pipe (14) includes the following steps: S10: The motor (307) drives the second reciprocating screw to rotate in conjunction with the bidirectional screw (201), causing the two sets of first bevel gears (3) and second bevel gears (301) to rotate, causing the moving plate (304) and cleaning scraper (305) to move back and forth, scraping off the impurities adhering to the filter plate (18); S11: The moving plate (304) moves back and forth to press the eccentric block (311). The eccentric block (311) drives the second rotating rod (31) to rotate, so that the torsion spring (314) stores the restoring force. When the moving plate (304) moves past the eccentric block (311), the eccentric block (311) resets and strikes the filter plate (18). S12: When the bidirectional screw (201) rotates to move the internal threaded sleeve (202) toward the middle of the delivery pipe (14), the first rotating rod (211) rotates away from the sleeve (204), driving the moving block (234) and the outer shell (233) to move toward the middle of the sleeve (204). The movement of the outer shell (233) will pull the pull rod (232) to move the piston (231), squeezing the gas and clean water into the round pipe (222) and spraying it out through the atomizing nozzle (223); S13: Under the action of the third spring (255), the arc-shaped scraper (256) is attached to the inner wall of the conveying pipe (14). The sleeve (204) moves and drives the arc-shaped scraper (256) to move, scraping off the dust and impurities adhering to the inner wall of the conveying pipe (14) and pushing the dust and impurities to the middle of the conveying pipe (14). S14: The movement of the sleeve (204) drives the second sprocket (266) to move and rotate. The rotation of the second sprocket (266) cooperates with the chain (267) and the first sprocket (264) to make the planar gear (262) rotate. The rotation of the planar gear (262) drives the toothed ring (261) to rotate. The rotation of the toothed ring (261) drives the arc-shaped scraper (256) to rotate, which can clean the inner wall of the conveying pipe (14). S15: After the sleeve (204) moves to the middle of the conveying pipe (14), the arc scraper (256) pushes the dust and impurities to the middle of the conveying pipe (14). When the double screw (201) stops rotating, the solenoid valve (16) starts and opens the drain pipe (15). When the double screw (201) continues to rotate, the solenoid valve (16) starts and closes the drain pipe (15).

10. A method for recovering waste heat from coal gangue combustion based on a grate cooler according to claim 8, characterized in that: The steps for filling the water storage box (22) are as follows: S20: When the sleeve (204) moves to the middle of the delivery pipe (14), the water plug (248) enters the water inlet pipe (24), the double screw (201) stops rotating, and the main water pipe (246) injects clean water into the water storage box (22). After the injection is completed, the main water pipe (246) stops discharging water, and the double screw (201) continues to rotate, causing the water storage box (22) to move towards the end of the delivery pipe (14). After the water storage box (22) moves, the water plug (248) moves out of the water inlet pipe (24), and under the action of the restoring force of the second spring (245), the sealing block (242) seals the water inlet pipe (24). S21: When the sleeve (204) moves toward the end of the delivery pipe (14), the first rotating rod (211) rotates toward the position closer to the sleeve (204) and drives the moving block (234) and the outer shell (233) to move away from the middle of the sleeve (204). The movement of the outer shell (233) will push the pull rod (232), causing the piston (231) to move and increasing the internal volume of the water storage box (22).

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