A boiler waste heat extraction device and its usage method

Abstract

The present application relates to a boiler waste heat extraction device and a method for using the same, including a boiler, the boiler is provided with a water tank, a combustion chamber and a heat recovery chamber. The heat recovery chamber includes an inner chamber, an outer chamber and a heating chamber. The heating chamber is provided with a water outlet pipe and a water inlet pipe. The water inlet pipe is communicated with the water tank, and the water outlet pipe is communicated with the boiler. A conveying pipe is provided between the combustion chamber and the inner chamber. The conveying pipe is fixedly provided with a first motor. The output shaft of the first motor is fixedly provided with a screw conveyor. The screw conveyor is rotatably connected in the conveying pipe. The inner chamber is rotatably connected with a rotating pipe. A first gear is fixed on the rotating pipe. The screw conveyor is fixedly provided with a second gear meshing with the first gear. A stirring rod is fixed on the rotating pipe. The stirring rod is fixedly provided with a stirring piece and a third gear. The inner chamber is provided with an annular groove. An annular gear meshing with the third gear is arranged in the annular groove. The inner chamber is provided with a discharge pipe. The discharge pipe is provided with a discharging assembly. The combustion chamber is provided with a heat recovery assembly. The present application has the effect of improving the heat recovery efficiency of the heat in the boiler ash.

Description

Technical Field

[0001] The present invention relates to the technical field of heat recovery equipment, and particularly relates to a boiler waste heat extraction device and a using method thereof. Background Art

[0002] A boiler is a common heating device and is widely used in the heating field. Boilers usually use coal as fuel. When coal burns, flue gas is generated. The flue gas carries a certain amount of heat, and there is also a certain amount of heat in the ash after coal combustion. Boiler equipment usually has a device for recovering residual heat.

[0003] The related technology can refer to the Chinese patent with the publication number CN208735918U, which discloses a boiler heat recovery device, including a boiler. A heat collecting pipe is welded to the upper end of the boiler, a heating furnace is welded to the upper end of the heat collecting pipe, a base is welded to one side of the boiler, a water storage tank is welded to the upper end of the base, a water outlet pipe is welded to one side of the water storage tank, a pipe penetrates between the water storage tank and the heating furnace, and a fuel tank is welded to the lower end of the boiler.

[0004] Regarding the above related technology, by setting a fuel tank to recover the waste heat in the coal ash, the heat in the coal ash radiates along the furnace wall of the built-in heating furnace to the water in the built-in heating furnace. The coal ash is in a static state in the fuel tank, and the heat transfer distance of the coal ash far from the heating furnace is relatively long. Therefore, it takes a long time to recover the heat in the coal ash, resulting in poor heat recovery efficiency of the coal ash. Summary of the Invention

[0005] In order to improve the heat recovery efficiency of the furnace ash, the present application provides a boiler waste heat extraction device and a using method thereof.

[0006] In a first aspect, the present application provides a boiler waste heat extraction device, adopting the following technical solutions:

[0007] A boiler waste heat extraction device, including a boiler, the boiler is connected to a water tank, a water supply pipe is connected between the water tank and the boiler, a combustion chamber is provided in the boiler, a grate for conveying coal is provided in the combustion chamber, the boiler is fixedly provided with a regenerative chamber, the regenerative chamber includes an inner chamber and an outer chamber, a heating cavity is provided between the inner chamber and the outer chamber, a water inlet pipe is connected to the lower end of the heating cavity, the water inlet pipe is connected to the water tank, a water outlet pipe is provided at the upper end of the heating cavity, the water outlet pipe is connected to the boiler, a conveying pipe is connected between the combustion chamber and the inner chamber, one end of the conveying pipe away from the regenerative chamber is fixedly provided with a motor I, the output shaft of the motor I is fixedly connected with a auger, the auger penetrates through the conveying pipe and is rotatably connected thereto, the inner chamber is rotatably connected with a rotating pipe, a gear I is fixedly connected to the upper end of the rotating pipe, the auger is fixedly connected with a gear II meshing with the gear I, a plurality of stirring rods are rotatably connected to the rotating pipe along the circumferential direction, the stirring rods are fixedly connected with stirring pieces, one end of the stirring rod is fixedly connected with a gear III, an annular groove is provided in the inner chamber, and a gear ring meshing with the gear III is fixedly connected to the inner wall of the annular groove, a discharge pipe is provided at the lower end of the inner chamber, a discharging assembly is provided on the discharge pipe, and a heat regeneration assembly for recovering the heat in the flue gas is connected to the combustion chamber.

[0008] By adopting the above technical solutions, the cold water in the water tank enters the boiler along the water supply pipe, the grate drives the coal to move in the combustion chamber, and then heats the cold water. The coal ash falls from the grate into the conveying pipe, the motor I drives the auger to rotate, and the auger sends the coal ash into the inner chamber along the conveying pipe. The cold water in the water tank enters the heating cavity along the water inlet pipe, and the heat in the coal ash in the inner chamber radiates to the cold water along the side wall of the inner chamber. After being heated, the cold water flows into the boiler along the water outlet pipe. When the auger rotates, it drives the gear I to rotate, the gear I drives the gear II to rotate, so that the gear II drives the rotating pipe to rotate, the rotating pipe drives the stirring rod to rotate, and when the stirring rod rotates, it drives the gear III to move. Under the meshing action of the gear ring and the gear III, the gear III drives the stirring rod to rotate around its own axis, so that the stirring rod drives the stirring piece to stir the coal ash, so that the coal ash in each part can contact the inner wall of the inner chamber, which is beneficial to accelerating the heat transfer in the coal ash in each part, shortening the time spent on heat recovery, and improving the heat recovery efficiency.

[0009] Optionally, a sealing ring is provided in the annular groove, a sliding groove communicating with the annular groove is provided in the inner chamber, the sealing ring is fixedly connected with a limiting block adapted to the sliding groove, and the limiting block is rotatably connected in the sliding groove. The stirring rod penetrates through the sealing ring and is rotatably connected thereto.

[0010] By adopting the above technical solutions, the inner wall of the sliding groove limits the limiting block, so that the sealing ring can rotate along the annular groove. The sealing ring can prevent the coal ash from entering the annular groove and affecting the meshing of the gear III and the gear ring, which is beneficial to improving the meshing stability of the gear III and the gear ring.

[0011] Optionally, the regenerative component includes a plurality of heat dissipation pipes, a smoke passage chamber, a first exhaust pipe, a heat exchanger, and a second exhaust pipe. The smoke passage chamber is fixedly connected to the upper end of the boiler. The smoke passage chamber is provided with a cavity. The heat dissipation pipes are all fixedly connected between the smoke passage chamber and the combustion chamber and communicate the two. The heat exchanger is fixedly connected inside the water tank. The first exhaust pipe is fixedly connected to the boiler. The two ends of the first exhaust pipe are respectively communicated with the smoke passage chamber and the heat exchanger. The second exhaust pipe is fixedly connected to the lower end of the heat exchanger and communicates with the heat exchanger.

[0012] By adopting the above technical solution, the flue gas generated after the coal combustion in the combustion chamber enters the heat dissipation pipes, and the cold water in the boiler is heated through the heat dissipation pipes. The heated flue gas converges into the smoke passage chamber and enters the heat exchanger through the first exhaust pipe, and performs secondary heat exchange with the cold water in the water tank through the heat exchanger, thereby realizing the recovery of the waste heat in the flue gas. The flue gas that has completed heat recovery is discharged through the second exhaust pipe.

[0013] Optionally, the discharging component includes a second motor, a first baffle, a second baffle, a driving wheel, a chain, a first sprocket, and a second sprocket. The second motor is fixedly connected to the discharging pipe. The driving wheel is fixedly connected to the output shaft of the second motor. Both the first baffle and the second baffle are rotatably connected to the inner wall of the discharging pipe. The first baffle is located at the upper end of the second baffle and the two are perpendicular to each other. The first baffle is fixedly connected with a first rotating shaft. The first rotating shaft penetrates the discharging pipe and is rotatably connected to it. The first sprocket is fixedly connected to the first rotating shaft. The second baffle is fixedly connected with a second rotating shaft. The second rotating shaft penetrates the discharging pipe and is rotatably connected to it. The second sprocket is fixedly connected to the second rotating shaft. The chain meshes with the driving wheel, the first sprocket, and the second sprocket.

[0014] By adopting the above technical solution, in the initial state, the first baffle is in a horizontal state and the second baffle is in a vertical state, and the first baffle seals the inner chamber. After the coal ash in the inner chamber completes heat recovery, the second motor drives the driving wheel to rotate. The driving wheel drives the first sprocket and the second sprocket to rotate through the chain, so that the first rotating shaft drives the first baffle to rotate to a vertical state, and the second rotating shaft drives the second baffle to rotate to a horizontal state. The heat-absorbed coal ash falls onto the second baffle. After the space between the second baffle and the first baffle is filled with furnace ash, the second motor drives the first baffle and the second baffle to reset, so that the first baffle seals the inner chamber and discharges the coal ash carried by the first baffle. The coal ash falls in segments, which is beneficial to reducing the probability that the coal ash that has not fully absorbed heat is directly discharged, and is beneficial to improving the heat absorption efficiency of the coal ash.

[0015] Optionally, a waste box is fixedly connected to the lower end of the discharging pipe. The waste box is fixedly provided with a third motor. The output shaft of the third motor penetrates the waste box and is rotatably connected to it. A filter box is slidably connected inside the waste box. An inclined groove is provided on the inner wall of the waste box. The inclined groove is inclined upward from the end of the waste box away from the third motor to the end close to the third motor. The filter box is fixedly connected with a sliding block. The sliding block is slidably connected in the inclined groove and fits with the waste box. The output end of the third motor is fixedly connected with a threaded rod. The threaded rod penetrates the sliding block and is threadedly connected to it.

[0016] By adopting the above technical solution, water is stored in the waste box, and the coal ash falls from the discharge pipe to the filter box and is soaked by water, which is conducive to reducing dust when handling the coal ash. Motor 3 drives the threaded rod to rotate, and under the support of the inclined slot on the slider, the threaded rod drives the filter box to move upward along the inclined slot through the slider, and then the coal ash is taken out of the water through the filter box, which is convenient for the next step of processing the coal ash.

[0017] Optionally, a plurality of rollers are evenly embedded in the inner wall of the sliding groove along the circumferential direction, and the limit block is rollingly connected to the rollers.

[0018] By adopting the above technical solution, the roller is helpful to reduce the friction between the limit block and the inner wall of the sliding groove, reduce wear, and extend the service life of the limit block.

[0019] Optionally, one end of the second smoke exhaust pipe away from the heat exchanger is fixedly connected to a spray box, a spray mechanism for spraying water mist on the smoke is fixedly provided in the spray box, and a drain pipe and an exhaust pipe are fixedly provided in the spray box.

[0020] By adopting the above technical solution, the flue gas that has completed heat recovery enters the spray box, and the spray mechanism sprays water mist to remove dust in the flue gas. The water collected in the spray box and the flue gas that has completed spraying are discharged from the drain port and the exhaust pipe respectively.

[0021] Optionally, the exhaust pipe is provided with an annular cavity, a filter screen is slidably connected to the inner wall of the annular cavity, one end of the exhaust pipe away from the spray box abuts against a limit plate, the limit plate is provided with a plurality of bolts, and the bolts are all passed through the limit plate and threadedly connected to the exhaust pipe.

[0022] By adopting the above technical solution, the filter screen performs secondary filtration on the flue gas, which is beneficial to reducing the content of harmful substances in the flue gas. The limit plate and the inner wall of the annular cavity position the filter screen. After removing the bolts, the limit plate can be removed, which facilitates the replacement of the filter screen.

[0023] In a second aspect, the present application provides a method for using a boiler waste heat extraction device, which adopts the following technical solution:

[0024] The coal burns in the combustion bin, thereby heating the cold water in the boiler. The coal ash after the coal is burned falls from the grate into the conveying pipe, and the motor one drives the auger to send the coal ash into the inner bin. The heat in the coal ash heats the cold water in the heating chamber along the inner wall of the inner bin. The cold water in the heating chamber continuously flows along the water inlet pipe and the water outlet pipe, thereby continuously recovering the heat in the coal ash. The auger drives the gear one to rotate through the gear two, and the gear one drives the toggle rod to rotate through the rotating tube. Under the meshing action of the gear ring and the gear three, the gear three drives the toggle rod to rotate around its own axis, thereby driving the toggle plate to toggle the coal ash, so that the coal ash in various parts of the inner bin can contact the inner wall of the inner bin.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] The cold water in the water tank enters the boiler along the water delivery pipe, and the grate drives the coal to move in the combustion chamber, thereby heating the cold water. The coal ash falls into the delivery pipe from the grate, and the motor drives the auger to rotate. The auger delivers the coal ash into the inner chamber along the delivery pipe. The cold water in the water tank enters the heating chamber along the water inlet pipe, and the heat in the coal ash in the inner chamber radiates into the cold water along the side wall of the inner chamber. After being heated, the cold water flows into the boiler along the outlet pipe. When the auger rotates, it drives gear one to rotate, and gear one drives gear two to rotate, so that gear two drives the rotating tube to rotate, and the rotating tube drives the toggle lever to rotate. When the toggle lever rotates, it drives gear three to move. Under the meshing action of the gear ring and gear three, gear three drives the toggle lever to rotate around its own axis, and then the toggle lever drives the toggle plate to toggle the coal ash, so that the coal ash in various parts can contact the inner wall of the inner chamber, which is conducive to accelerating the transfer of heat in various parts of the coal ash, shortening the time spent on heat recovery, and improving the heat recovery efficiency.

[0027] The inner wall of the sliding groove over-limits the limit block, so that the sealing ring can rotate along the annular groove. The sealing ring can prevent coal ash from entering the annular groove and affecting the meshing of the gear three and the gear ring, which is beneficial to improving the stability of the meshing of the gear three and the gear ring.

[0028] In the initial state, baffle 1 is in a horizontal state, baffle 2 is in a vertical state, and baffle 1 seals the inner bin. After the heat recovery of the coal ash in the inner bin is completed, the motor 2 drives the driving wheel to rotate, and the driving wheel drives the sprocket 1 and sprocket 2 to rotate through the chain, so that the rotating shaft 1 drives the baffle 1 to rotate to a vertical state, and the rotating shaft 2 drives the baffle 2 to rotate to a horizontal state, and the coal ash after absorbing heat falls onto the baffle 2. After the space between baffle 2 and baffle 1 is filled with furnace ash, the motor 2 drives baffle 1 and baffle 2 to reset, so that baffle 1 seals the inner bin and discharges the coal ash carried by baffle 1. The coal ash falls in sections, which is conducive to reducing the probability of coal ash that has not fully absorbed heat being directly discharged, and is conducive to improving the efficiency of absorbing the heat of the coal ash. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of a boiler waste heat extraction device of the present application.

[0030] Figure 2 This is a schematic diagram intended to highlight the internal structure of a boiler.

[0031] Figure 3 It is a schematic diagram intended to highlight the connection between the water tank and the spray box.

[0032] Figure 4 This is a schematic diagram intended to highlight the structure of the reheat chamber.

[0033] Figure 5 is Figure 4 an enlarged schematic view of part A in

[0034] Figure 6 a schematic view designed to highlight the connection between gear three and the gear ring.

[0035] Figure 7 a schematic view designed to highlight the structure of the waste bin.

[0036] Figure 8 a schematic view designed to highlight the structure of the filter box.

[0037] Figure 9 a schematic view designed to highlight the structure of the exhaust pipe.

[0038] Description of reference numerals: 1. Boiler; 2. Water tank; 21. Water supply pipe; 11. Combustion chamber; 111. Grate; 112. Fan; 113. Feeding port; 114. Hopper; 3. Regeneration chamber; 5. Spraying box; 51. Drain pipe; 52. Exhaust pipe; 511. Annular cavity; 512. Filter screen; 513. Limiting disc; 514. Bolt; 53. Spraying mechanism; 31. Inner chamber; 311. Rotating pipe; 312. Gear one; 313. Poking rod; 314. Poking piece; 315. Gear three; 316. Annular groove; 317. Gear ring; 34. Discharge pipe; 35. Discharging assembly; 351. Motor two; 352. Baffle one; 353. Baffle two; 354. Driving wheel; 355. Chain; 356. Sprocket one; 357. Sprocket two; 358. Shaft one; 359. Shaft two; 32. Outer chamber; 321. Heating cavity; 322. Water inlet pipe; 323. Water outlet pipe; 33. Delivery pipe; 331. Motor one; 332. Auger; 333. Gear two; 36. Sealing ring; 361. Limiting block; 318. Sliding groove; 319. Roller; 41. Heat dissipation pipe; 42. Smoke passage cavity; 43. Exhaust pipe one; 44. Heat exchange element; 45. Exhaust pipe two; 6. Waste bin; 61. Motor three; 62. Filter box; 63. Inclined chute; 621. Slide block; 622. Slide rod; 611. Threaded rod. Detailed implementation manners

[0039] The following further elaborates on the present application in conjunction with all the attached drawings.

[0040] The embodiment of the present application discloses a boiler waste heat extraction device.

[0041] Refer to Figure 1 and Figure 2, A boiler waste heat extraction device, including a boiler 1, the boiler 1 is provided with a water tank 2, a combustion chamber 11 and a regenerative chamber 3. The boiler 1 and the water tank 2 are connected through a water supply pipe 21, and both the boiler 1 and the water tank 2 are provided with heat insulation layers. Cold water is stored in the water tank 2, and the cold water flows into the boiler 1 along the water supply pipe 21. A grate 111 is installed in the combustion chamber 11, and the grate 111 is arranged along the length direction of the boiler 1.

[0042] Refer to Figure 1 and Figure 2 , The boiler 1 is equipped with a hopper 114 adapted to the grate 111. The operator transports coal to the grate 111 through the hopper 114. The coal burns while moving on the grate 111, and the heat generated by the combustion heats the cold water in the boiler 1. A blower 112 is provided at the lower end of the grate 111, so that the coal burns more fully. A discharge port 113 is fixed at one end of the boiler 1 away from the hopper 114. When the coal ash generated after the coal combustion moves to the end of the grate 111, it falls into the discharge port 113.

[0043] Refer to Figure 2 and Figure 3 , The combustion chamber 11 is connected with a regenerative component. The regenerative component includes a number of heat dissipation pipes 41, a smoke chamber 42, a first exhaust pipe 43, a heat exchanger 44 and a second exhaust pipe 45. The heat exchanger 44 is installed in the water tank 2, the smoke chamber 42 is located in the boiler 1, and both ends of the heat dissipation pipe 41 are fixedly connected to the smoke chamber 42 and the combustion chamber 11 respectively, thereby connecting the two. The coal combustion generates high-temperature flue gas. The flue gas enters the heat dissipation pipe 41 from the combustion chamber 11. The heat dissipation pipe 41 has a heat transfer effect, and the heat in the flue gas is transferred from the heat dissipation pipe 41 to the cold water in the boiler 1 (refer to Figure 1 ) to heat the cold water.

[0044] Refer to Figure 2 and Figure 3 , One end of the first exhaust pipe 43 is connected to the smoke chamber 42, and the other end is connected to the upper end of the heat exchanger 44. The flue gas that has completed the preliminary heat exchange enters the smoke chamber 42, and then enters the heat exchanger 44 along the first exhaust pipe 43, and exchanges heat with the cold water in the water tank 2 through the heat exchanger 44 to recover the waste heat in the flue gas. The second exhaust pipe 45 is fixed to the lower end of the heat exchanger 44, and the flue gas that has completed the secondary heat exchange is discharged from the second exhaust pipe 45.

[0045] Refer to Figure 1 and Figure 4The reheat bin 3 includes an inner bin 31 and an outer bin 32, the inner bins 31 are fixedly connected to each other, and the outer bin 32 is provided with a heat insulation layer. A heating chamber 321 is provided between the inner bin 31 and the outer bin 32, and a conveying pipe 33 is provided between the combustion bin 11 and the inner bin 31. The conveying pipe 33 is fixedly connected to the boiler 1 and communicated with the discharge port 113. One end of the conveying pipe 33 away from the discharge port 113 is communicated with the inner bin 31, and the coal ash falls into the conveying pipe 33 through the discharge port 113.

[0046] Reference Figure 2 and Figure 4 The end of the conveying pipe 33 away from the heat recovery bin 3 is equipped with a motor 331, and an auger 332 is fixed to the output shaft of the motor 331. One end of the auger 332 is passed through the conveying pipe 33 and is rotatably connected to the conveying pipe 33. The operator operates the motor 331 to drive the auger 332 to rotate, and the auger 332 transports the coal ash in the conveying pipe 33 to the inner bin 31. The upper end of the heat recovery bin 3 is equipped with a water inlet pipe 322, and the lower end is equipped with a water outlet pipe 323. The water inlet pipe 322 and the water outlet pipe 323 are both connected to the heating chamber 321. The water inlet pipe 322 is connected to the water tank 2 (refer to Figure 1 ) connected, water tank 2 (refer to Figure 1 ) enters the heating chamber 321 through the water inlet pipe 322.

[0047] Reference Figure 2 and Figure 4 The inner bin 31 is made of stainless steel and has the performance of transferring heat. The heat of the coal ash in the inner bin 31 is transferred from the inner wall of the inner bin 31 to the cold water in the heating chamber 321. The outer bin 32 extends in the direction close to the boiler 1 and wraps the delivery pipe 33, so that the cold water in the heating chamber 321 contacts the delivery pipe 33, and then the heat recovery starts when the coal ash is transported in the delivery pipe 33. The outer bin 32 is fixed with a water outlet pipe 323, one end of which is connected to the heating chamber 321, and the other end is connected to the boiler 1. After the water in the heating chamber 321 absorbs heat, it flows into the boiler 1 along the water outlet pipe 323.

[0048] Reference Figure 4 and Figure 5 The upper end of the inner bin 31 is rotatably connected to a rotating tube 311, a gear 1 312 is fixed to the rotating tube 311, a gear 2 333 is fixed to a point of the auger 332 close to the rotating tube 311, the gear 1 312 is meshed with the gear 2 333, when the operator operates the auger 332 to rotate, the gear 1 312 can be driven to rotate through the gear 2 333, and then the rotating tube 311 is driven to rotate. The rotating tube 311 is rotatably connected to a toggle rod 313 along the circumferential direction, when the rotating tube 311 rotates, the toggle rod 313 is driven to rotate with the rotating tube 311 as the axis, and when the toggle rod 313 rotates, the coal ash in the inner bin 31 is turned over, so that the coal ash in various parts of the inner bin 31 can contact the inner wall of the inner bin 31, which is conducive to accelerating the transfer of heat in the overall coal ash.

[0049] Reference Figure 5 and Figure 6 As shown in Figure 6 , at one end of the shifting rod 313 away from the rotating pipe 311, a third gear 315 is fixedly connected. An annular groove 316 is formed in the inner wall of the inner bin 31. The third gear 315 is located in the annular groove 316. When the shifting rod 313 rotates, it drives the third gear 315 to move along the annular groove 316. A gear ring 317 meshing with the third gear 315 is fixedly connected to the inner wall of the annular groove 316. When the third gear 315 moves along the annular groove 316, it drives the shifting rod 313 to rotate around its own axis through the meshing with the gear ring 317.

[0050] Reference Figure 4 and Figure 6 As shown in Figure 6 , the shifting rod 313 is axially fixedly connected with a shifting piece 314. When the shifting rod 313 rotates, it drives the shifting piece 314 to further stir the coal ash in the inner bin 31, which is beneficial to improving the stirring effect of the coal ash, accelerating the heat transfer in the coal ash, shortening the time spent on recovering the heat of the coal ash, and improving the heat recovery efficiency.

[0051] Reference Figure 4 and Figure 5 As shown in Figure 5 , a sealing ring 36 is provided in the annular groove 316. The shifting rod 313 passes through the sealing ring 36 and is rotatably connected thereto. A sliding groove 318 is formed in the inner wall of the inner bin 31 (refer to the figure). The sliding groove 318 communicates with the annular groove 316. The sealing ring 36 is fixed with a limiting block 361, and the limiting block 361 is slidably connected in the sliding groove 318. When the shifting rod 313 rotates around the rotating pipe 311, it drives the sealing ring 36 to rotate around the rotating pipe 311. The sealing ring 36 is beneficial to reducing the probability that the coal ash affects the meshing stability between the third gear 315 and the gear ring 317.

[0052] Reference Figure 4 and Figure 5 As shown in Figure 5 , a plurality of rollers 319 are embedded in the inner wall of the sliding groove 318 along the circumferential direction. The rollers 319 are all rotatably connected to the inner bin 31. The limiting block 361 abuts against the rollers 319 and is in rolling connection with the rollers 319. The rollers 319 are beneficial to reducing the friction between the limiting block 361 and the inner wall of the sliding groove 318, thereby reducing the wear of the limiting block 361 and improving the service life of the limiting block 361.

[0053] Reference Figure 4The lower end of the inner bin 31 is provided with a discharge pipe 34, and the discharge pipe 34 is provided with a discharge assembly 35, and the discharge assembly 35 includes a motor 2 351, a baffle 1 352, a baffle 2 353, a driving wheel 354, a chain 355, a sprocket 1 356 and a sprocket 2 357. The baffle 1 352 and the baffle 2 353 are both rotatably connected to the inner wall of the discharge pipe 34, and the light shielding plate 1 and the baffle 2 353 are both adapted to the inner diameter of the discharge pipe 34. The baffle 1 352 is located directly above the baffle 2 353, the baffle 1 352 is horizontally arranged, and the side of the baffle 1 352 is in contact with the discharge pipe 34. The coal ash in the inner bin 31 conflicts with the baffle 1 352, the baffle 1 352 carries the coal ash, and the baffle 1 352 seals the inner bin 31, which is conducive to reducing the loss of heat in the inner bin 31.

[0054] Reference Figure 4 The baffle plate 353 is vertically arranged, and the baffle plate 353 is fixed with a rotating shaft 359, and the rotating shaft 359 is provided with a material discharge pipe and is rotatably connected thereto. The sprocket 357 is located at one end of the rotating shaft 359 away from the baffle plate 353, and the sprocket 357 is coaxially fixed with the rotating shaft 359. When the sprocket 357 rotates, the baffle plate 353 is driven to rotate. The baffle plate 1 352 is fixed with a rotating shaft 1 358, and the rotating shaft 1 358 is provided with a material discharge pipe and is rotatably connected thereto. The sprocket 1 356 and the sprocket 2 357 are in the same plane, and the sprocket 1 356 is coaxially fixed with the rotating shaft 359. When the sprocket 1 356 rotates, the baffle plate 353 is driven to rotate.

[0055] Reference Figure 4 and Figure 5 The motor 2 351 is fixedly connected to the discharge pipe 34, the driving wheel 354 is coaxially fixed with the motor 2 351, and the operator operates the motor 2 351 to drive the driving wheel 354 to rotate. The chain 355 is meshed and connected between the driving wheel 354 and the sprocket 1 356 and the sprocket 2 357, so that when the driving wheel 354 rotates, the sprocket 1 356 and the sprocket 2 357 are driven to rotate. The ash is continuously transported to the inner bin 31 along the conveying pipe 33 and accumulated in the inner bin 31. The heat recovery of the coal ash at the lower end of the inner bin 31 is relatively sufficient.

[0056] Reference Figure 4 When the ash in the inner bin 31 needs to be discharged, the motor 2 351 is operated to drive the baffle 1 352 and the baffle 2 353 to rotate synchronously through the chain 355, the baffle 1 352 rotates to a vertical state, and the baffle 2 353 rotates to a horizontal state, so that the ash at the lower end of the inner bin 31 falls onto the baffle 2 353. There is a certain gap between the baffle 1 352 and the baffle 2 353. After the ash is filled in the gap, it stops falling. At this time, the ash in the inner bin 31 is mainly the ash that has not been heat recovered.

[0057] Reference Figure 4Then, the operator continues to operate the second motor 351 to rotate, thereby turning the first baffle 352 and the second baffle 353 back to their initial states. At this time, the furnace ash on the second baffle 353 falls, and then is discharged through the discharge pipe 34. The segmented falling of the coal ash is conducive to keeping the inner bin 31 sealed, which is beneficial to slowing down the heat dissipation in the inner bin 31, improving the absorption efficiency of the heat of the coal ash, and at the same time reducing the probability that the coal ash that has not undergone heat recovery is directly discharged along the discharge pipe 34.

[0058] Refer to Figure 4 and Figure 7 , a waste box 6 is installed at the lower end of the discharge pipe 34, and the waste box 6 is communicated with the discharge pipe 34. A filter box 62 is provided in the waste box 6, and the filter box 62 is located directly below the discharge pipe 34. The coal ash falls from the discharge pipe 34 into the filter box 62. Water is stored in the waste box 6, and the coal ash falls into the water and gets wet, which is beneficial to reducing the dust emitted by the coal ash when dealing with the coal ash. A third motor 61 is installed outside the waste box 6. The third motor 61 is inclined, and the output shaft of the third motor 61 passes through the waste box 6 and is rotatably connected thereto.

[0059] Refer to Figure 7 and Figure 8 , inclined grooves 63 are provided on both sides of the inner wall of the waste box 6 along the width direction. The inclined grooves 63 are arranged along the length direction of the waste box 6. The end of the inclined groove 63 far from the third motor 61 is located at the lower end of the waste box 6, and the end close to the third motor 61 is located at the upper end of the waste box 6. Sliders 621 adapted to the inclined grooves 63 are fixed on both sides of the filter box 62. The sliders 621 are slidably connected to the inclined grooves 63 and are in contact with the waste box 6. Under the limiting action of the inclined grooves 63 on the sliders 621, the sliders 621 drive the filter box 62 to move along the inclined grooves 63.

[0060] Refer to Figure 7 and Figure 8 , a threaded rod 611 is coaxially fixed to the output end of the third motor 61. The threaded rod 611 is arranged along the length direction of the inclined groove 63. The threaded rod 611 passes through any slider 621 and is threadedly connected thereto. A slide rod 622 is provided in the inclined groove 63 where the other slider 621 is located. The slide rod 622 passes through the corresponding slider 621 and is slidably connected thereto. The operator operates the third motor 61 to drive the threaded rod 611 to rotate, and then drives the slider 621 to move along the inclined groove 63 through the threaded rod 611, so that the slider 621 drives the filter box 62 to move towards the third motor 61, so that the filter box 62 takes the coal ash out of the water, which is convenient for the operator to deal with the coal ash.

[0061] Refer to Figure 3 and Figure 7, one end of the second exhaust pipe 45 far away from the heat exchanger 44 is provided with a spray box 5. The interior of the spray box 5 is hollow, and the flue gas enters the spray box 5 through the second exhaust pipe 45. The spray box 5 is provided with a spraying mechanism 53. There is dust in the flue gas, and the operator sprays through the spraying mechanism 53, which is beneficial to reducing the dust content in the flue gas in the spray box 5.

[0062] Refer to Figure 3 and Figure 7 , a drain pipe 51 is provided at the lower end of the spray box 5, and the sewage mixed with dust in the spray box 5 is discharged along the drain pipe 51. An exhaust pipe 52 is installed at the upper end of the spray box 5, and the soot is discharged through the exhaust pipe 52. An annular cavity 511 is opened at one end of the exhaust pipe 52 far away from the spray box 5. A filter net 512 is slidably connected in the annular cavity 511. The filter net 512 contains activated carbon, and the activated carbon can adsorb harmful substances in the flue gas when the flue gas passes through the filter net 512, which is beneficial to reducing the content of harmful substances in the flue gas.

[0063] Refer to Figure 3 and Figure 7 , the exhaust pipe 52 is provided with a limit disk 513. The limit disk 513 abuts against the exhaust pipe 52, and a plurality of bolts 514 are provided on the side away from the exhaust pipe 52. The operator passes the bolts 514 through the limit disk 513 and threads them with the exhaust pipe 52. The filter net 512 fits with the limit disk 513, and the inner wall of the annular cavity 511 and the limit disk 513 clamp and position the filter net 512. After the operator removes all the bolts 514, the limit disk 513 can be removed, and then it is convenient to replace the filter net 512.

[0064] The implementation principle of the boiler waste heat extraction device in the embodiment of the present application is as follows: The cold water in the water tank 2 is sent into the boiler 1, and the coal burning in the combustion chamber 11 heats the cold water. The grate 111 drives the coal ash to fall into the conveying pipe 33. The first motor 331 drives the auger 332 to rotate, and sends the coal ash in the conveying pipe 33 into the inner chamber 31. The heat in the coal ash diffuses along the inner wall of the inner chamber 31 to heat the cold water in the heating chamber 321. The cold water that has completed heat transfer enters the boiler 1 along the water outlet pipe 323, and the water inlet pipe 322 continuously sends the cold water in the water tank 2 into the heating chamber 321, which is beneficial to ensuring the heat exchange efficiency. The auger 332 drives the rotating pipe 311 to rotate through the meshing transmission of the first gear 312 and the second gear 333. The rotating pipe 311 drives the stirring rod 313 to rotate. Under the meshing action of the gear ring 317 and the third gear 315, the third gear 315 drives the stirring rod 313 to rotate around its own axis, and the stirring piece 314 turns over the coal ash, so that the coal ash at each position in the inner chamber 31 contacts the inner wall of the inner chamber 31, which is beneficial to accelerating the heat transfer efficiency of the coal ash at each part and improving the heat recovery efficiency.

[0065] The embodiments of the present application also disclose a method for using a boiler waste heat extraction device, including: coal is burned in the combustion chamber 11, thereby heating the cold water in the boiler 1. The coal ash after coal combustion falls from the grate 111 into the conveying pipe 33, and the first motor 331 drives the auger 332 to send the coal ash into the inner chamber 31. The heat in the coal ash heats the cold water in the heating chamber 321 along the inner wall of the inner chamber 31. The cold water in the heating chamber 321 continuously flows along the water inlet pipe 322 and the water outlet pipe 323, thereby continuously recovering the heat in the coal ash. The auger 332 drives the second gear 333 to rotate through the first gear 312, and the second gear 333 drives the dial rod 313 to rotate around through the rotating pipe 311. Under the meshing action of the gear ring 317 and the third gear 315, the second gear 333 drives the dial rod 313 to rotate around its own axis, thereby driving the dial piece 314 to stir the coal ash, so that the coal ash in each part of the inner chamber 31 can contact the inner wall of the inner chamber 31, which is beneficial to accelerating the heat transfer in the coal ash in each part and improving the heat recovery efficiency.

[0066] The above are all the preferred embodiments of the present application. Without limiting the protection scope of the present application accordingly, therefore: all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A boiler waste heat extraction device, characterized in that: The invention comprises a boiler (1), the boiler (1) is connected to a water tank (2), a water supply pipe (21) is connected between the water tank (2) and the boiler (1), a combustion chamber (11) is provided in the boiler (1), a grate (111) for conveying coal is provided in the combustion chamber (11), the boiler (1) is fixedly provided with a heat recovery chamber (3), the heat recovery chamber (3) comprises an inner chamber (31) and an outer chamber (32), a heating chamber (321) is provided between the inner chamber (31) and the outer chamber (32) The lower end of the heating chamber (321) is connected to a water inlet pipe (322), which is connected to the water tank (2). The upper end of the heating chamber (321) is provided with a water outlet pipe (323), which is connected to the boiler (1). A delivery pipe (33) is connected between the combustion chamber (11) and the inner chamber (31). A motor (331) is fixedly provided at one end of the delivery pipe (33) away from the heat recovery chamber (3). The output shaft of the motor (331) is fixedly connected to the combustion chamber (11). The inner chamber (31) is connected to a screw conveyor (332), the screw conveyor (332) is provided with a conveying pipe (33) and is rotatably connected thereto, the inner chamber (31) is rotatably connected to a rotating pipe (311), the upper end of the rotating pipe (311) is fixedly connected to a gear 1 (312), the screw conveyor (332) is fixedly connected to a gear 2 (333) meshing with the gear 1 (312), the rotating pipe (311) is rotatably connected to a plurality of toggle rods (313) along a circumferential direction, the toggle rods (313) are fixedly connected to the rotating pipe (311) A toggle plate (314) is provided, one end of the toggle rod (313) is fixedly connected to a gear three (315), an annular groove (316) is provided in the inner bin (31), a gear ring (317) meshing with the gear three (315) is fixedly connected to the inner wall of the annular groove (316), a discharge pipe (34) is provided at the lower end of the inner bin (31), the discharge pipe (34) is provided with a discharge assembly (35), and the combustion bin (11) is connected to a heat recovery assembly for recovering heat in the flue gas.

2. The boiler waste heat extraction device according to claim 1, characterized in that: The annular groove (316) is provided with a sealing ring (36); the inner chamber (31) is provided with a sliding groove (318) connected to the annular groove (316); the sealing ring (36) is fixedly connected to a limit block (361) adapted to the sliding groove (318); the limit block (361) is rotatably connected to the sliding groove (318); and the toggle rod (313) passes through the sealing ring (36) and is rotatably connected to the sealing ring (36).

3. A boiler waste heat extraction device according to claim 1, characterized in that: The heat recovery component comprises a plurality of heat dissipation pipes (41), a smoke passage cavity (42), a smoke exhaust pipe 1 (43), a heat exchanger (44) and a smoke exhaust pipe 2 (45). The smoke passage cavity (42) is fixedly connected to the upper end of the boiler (1). The smoke passage cavity (42) is provided with a cavity. The heat dissipation pipes (41) are fixedly connected between the smoke passage cavity (42) and the combustion chamber (11) and connect the two. The heat exchanger (44) is fixedly connected to the water tank (2). The smoke exhaust pipe 1 (43) is fixedly connected to the boiler (1). The two ends of the smoke exhaust pipe 1 (43) are respectively connected to the smoke passage cavity (42) and the heat exchanger (44). The smoke exhaust pipe 2 (45) is fixedly connected to the lower end of the heat exchanger (44) and connects to the heat exchanger (44).

4. A boiler waste heat extraction device according to claim 1, characterized in that: The feeding component (35) includes a second motor (351), a first baffle (352), a second baffle (353), a driving wheel (354), a chain (355), a first sprocket (356) and a second sprocket (357). The second motor (351) is fixedly connected to the discharge pipe (34). The driving wheel (354) is fixedly connected to the output shaft of the second motor (351). Both the first baffle (352) and the second baffle (353) are rotatably connected to the inner wall of the discharge pipe (34). The first baffle (352) is located at the upper end of the second baffle (353) and the two are perpendicular to each other. The first baffle (352) is fixedly connected to a first rotating shaft (358). The first rotating shaft (358) penetrates through the discharge pipe (34) and is rotatably connected thereto. The first sprocket (356) is fixedly connected to the first rotating shaft (358). The second baffle (353) is fixedly connected to a second rotating shaft (359). The second rotating shaft (359) penetrates through the discharge pipe (34) and is rotatably connected thereto. The second sprocket (357) is fixedly connected to the second rotating shaft (359). The chain (355) is meshed with the driving wheel (354), the first sprocket (356) and the second sprocket (357).

5. A boiler waste heat extraction device according to claim 1, characterized in that: A waste box (6) is fixedly connected to the lower end of the discharge pipe (34). A third motor (61) is fixedly provided on the waste box (6). The output shaft of the third motor (61) penetrates through the waste box (6) and is rotatably connected thereto. A filter box (62) is slidably connected in the waste box (6). An inclined groove (63) is formed on the inner wall of the waste box (6). The inclined groove (63) is inclined upward from one end of the waste box (6) away from the third motor (61) to one end close to the third motor (61). The filter box (62) is fixedly connected with a slider (621). The slider (621) is slidably connected in the inclined groove (63) and is in contact with the waste box (6). The output end of the third motor (61) is fixedly connected with a threaded rod (611). The threaded rod (611) penetrates through the slider (621) and is threadedly connected thereto.

6. The boiler waste heat extraction device according to claim 2, characterized in that: A plurality of rollers (319) are evenly embedded in the inner wall of the sliding groove (318) along the circumferential direction. The limiting block (361) is in rolling connection with the rollers (319).

7. An apparatus for extracting waste heat from a boiler according to claim 3, characterized in that: One end of the second smoke exhaust pipe (45) far away from the heat exchange element (44) is fixedly connected with a spray box (5). A spray mechanism (53) for spraying water mist on the flue gas is fixedly provided in the spray box (5). The spray box (5) is fixedly provided with a drain pipe (51) and an exhaust pipe (52).

8. A boiler waste heat extraction device according to claim 7, characterized in that: An annular cavity (511) is formed in the exhaust pipe (52). A filter net (512) is slidably connected to the inner wall of the annular cavity (511). One end of the exhaust pipe (52) far away from the spray box (5) abuts against a limiting disc (513). A plurality of bolts (514) are provided on the limiting disc (513). The bolts (514) all penetrate through the limiting disc (513) and are threadedly connected to the exhaust pipe (52).

9. A method for using a boiler waste heat extraction device, which is applied to a boiler waste heat extraction device as described in any one of claims 1-8, and is characterized in that: The coal burns in the combustion chamber (11), thereby heating the cold water in the boiler (1). The coal ash after coal combustion falls from the grate (111) into the conveying pipe (33). The first motor (331) drives the auger (332) to send the coal ash into the inner chamber (31). The heat in the coal ash heats the cold water in the heating chamber (321) along the inner wall of the inner chamber (31). The cold water in the heating chamber (321) continuously flows along the water inlet pipe (322) and the water outlet pipe (323), thereby continuously recovering the heat in the coal ash. The auger (332) drives the first gear (312) to rotate through the second gear (333). The first gear (312) drives the stirring rod (313) to rotate around through the rotating pipe (311). Under the meshing action of the gear ring (317) and the third gear (315), the third gear (315) drives the stirring rod (313) to rotate around its own axis, thereby driving the stirring piece (314) to stir the coal ash, so that the coal ash in each part of the inner chamber (31) can contact the inner wall of the inner chamber (31).

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