Waste incineration flue gas waste heat recycling device and method

Abstract

The invention relates to the technical field of waste heat recycling, in particular to a waste incineration flue gas waste heat recycling device and method.The waste incineration flue gas waste heat recycling device comprises a recycling box and further comprises a plurality of heat conduction pipes, a plurality of heat exchange pipes and a plurality of heat exchange pipes, the slag scraping pieces are arranged in the upper smoke exhaust cavity and correspond to the heat conduction pipes one to one; and the lifting mechanism is arranged on the recycling box. By arranging the heat conduction pipe, the slag scraping piece and the lifting mechanism, when waste incineration flue gas waste heat is recycled, flue gas penetrates through the heat conduction pipe from bottom to top, and particle impurities in the flue gas are attached to the inner wall of the heat conduction pipe; when the inner wall of the heat conduction pipe needs to be cleaned, the slag scraping piece is driven by the lifting mechanism to move downwards and penetrate through the interior of the heat conduction pipe, so that impurities attached to the inner wall of the heat conduction pipe are scraped off, the heat transfer efficiency is prevented from being affected by the impurities, and the problem that in the prior art, the flue gas waste heat recovery effect is poor is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of waste heat recovery, and in particular to a device and method for recovering waste heat from waste incineration flue gas. Background Art

[0002] The working principle of the waste incineration flue gas waste heat recovery device is mainly based on heat exchange technology. A heat exchanger is installed inside the device. When the high-temperature flue gas passes through the heat exchanger, the waste heat in the flue gas will be absorbed by the medium in the heat exchanger (such as water, air, etc.), thereby increasing the temperature of the medium. Subsequently, these heated media can be used for other heating processes or power generation, thereby realizing the recovery of waste heat.

[0003] Since the flue gas contains particulate impurities, when the flue gas enters the heat exchanger, the particulate impurities will adhere to the tube wall of the heat exchanger and gradually accumulate; as the use time increases, the impurity layer on the tube wall of the heat exchanger will gradually become thicker, which will affect the heat transfer efficiency, resulting in poor flue gas waste heat recovery effect. In order to solve this problem, in traditional technology, workers usually need to disassemble and clean the heat exchanger to remove impurities attached to the tube wall. However, on the one hand, this method will cause the workers' labor intensity to be higher, and on the other hand, disassembly and cleaning will also cause the waste heat recovery device to be temporarily unusable, which may affect the work efficiency of the production workshop. To this end, we propose a waste incineration flue gas waste heat recovery device and method to effectively solve the above-mentioned drawbacks. Summary of the invention

[0004] The object of the present invention is to provide a device and method for recovering waste heat from flue gas from waste incineration, which is used to solve the problem mentioned in the above background technology that particulate impurities accumulate on the tube wall of the heat exchanger, resulting in poor flue gas waste heat recovery effect.

[0005] The present invention is realized by the following technical scheme: a waste incineration flue gas waste heat recovery and utilization device, including a recovery box, and also including: Two sealing baffles, which are fixed in the recovery box at intervals along the vertical direction, and are used to divide the recovery box into an upper smoke exhaust chamber, a middle heat exchange chamber and a lower smoke inlet chamber; A plurality of heat conducting pipes, each of which is parallel and fixed between two sealing partitions at intervals, so that the upper smoke exhaust cavity and the lower smoke inlet cavity are connected; A plurality of scraper pieces, which are arranged in the upper smoke exhaust cavity and correspond to each heat conduction pipe one by one; The lifting mechanism is arranged on the recovery box and is used to drive each scraper to move along the axial direction of the corresponding heat conducting pipe.

[0006] Optionally, a fixing frame is fixed in the upper smoke exhaust cavity, and a supporting frame is fixed in the lower smoke inlet cavity; The lifting mechanism includes a hollow column fixed between the fixing frame and the supporting frame and passing through each heat conducting tube one by one, a screw located in each hollow column is rotatably connected between the fixing frame and the supporting frame, and a driving assembly for driving each screw to rotate synchronously is arranged on the recovery box; A screw sleeve located in the hollow column is threadedly connected to each screw rod, two symmetrical fixing plates are fixed between the outer surface of each screw sleeve and the scraper, and each hollow column is provided with vertical strip holes for the two fixing plates to pass through one by one.

[0007] Optionally, the driving assembly includes a mounting shell fixed on a fixing frame, a driving shaft arranged in a horizontal direction is rotatably connected inside the mounting shell, and a servo motor drivingly connected to the driving shaft is installed outside the recovery box; A driven bevel gear located in a mounting shell is fixed at the upper end of each screw rod, and a driving bevel gear meshing with each driven bevel gear one by one is fixed on the driving shaft.

[0008] Optionally, a first corrugated tube located at the periphery of the hollow column is fixed between the scraper and the fixing frame, and a second corrugated tube located at the periphery of the hollow column is fixed between the scraper and the supporting frame.

[0009] Optionally, the scraper comprises an annular shell movably sleeved on the periphery of the hollow column and fixed to the corresponding two fixed plates, a plurality of upper connecting rods are arranged in the annular shell at intervals along the circumferential direction, each upper connecting rod movably passes through the outer ring of the annular shell and an upper arc-shaped scraper is fixed on the outer end; A plurality of lower connecting rods are arranged at intervals along the circumferential direction in the annular shell, each lower connecting rod is located below the upper connecting rod, each lower connecting rod movably passes through the outer ring of the annular shell and has a lower arc scraper fixed on the outer end, each lower arc scraper is located below the upper arc scraper; An adjusting assembly is arranged in the annular shell to enable each upper connecting rod and each lower connecting rod to synchronously extend and retract along the radial direction of the annular shell; When the upper connecting rods and the lower connecting rods are fully extended, the upper arc scrapers and the lower arc scrapers can fit with the inner surface of the heat conducting pipe.

[0010] Optionally, two upper arc scrapers are provided, and two lower arc scrapers are provided, the two upper arc scrapers and the two lower arc scrapers are staggered with each other, and the central angle of each upper arc scraper and each lower arc scraper is 100°-120°.

[0011] Optionally, the adjustment assembly includes a rotating ring rotatably connected to the annular shell, and an upper ring and a lower ring are fixed on the outer ring of the rotating ring in sequence from top to bottom; The upper ring is provided with upper arc-shaped adjustment holes corresponding to the upper connecting rods one by one, and the inner end of each upper connecting rod is provided with an upper adjustment groove, and an upper adjustment rod is fixed in each upper adjustment groove and movably passes through the corresponding upper arc-shaped adjustment hole; The lower ring is provided with lower arc-shaped adjustment holes corresponding to the lower connecting rods one by one, the inner end of each lower connecting rod is provided with a lower adjustment groove, and a lower adjustment rod that movably passes through the corresponding lower arc-shaped adjustment hole is fixed in each lower adjustment groove; When the rotating ring rotates, driving the upper ring and the lower ring to rotate synchronously, the upper connecting rod is driven to telescopically move along the radial direction of the annular shell through the cooperation of the upper adjusting rod and the upper arc-shaped adjusting hole; and the lower connecting rod is driven to telescopically move along the radial direction of the annular shell through the cooperation of the lower adjusting rod and the lower arc-shaped adjusting hole.

[0012] Optionally, two slide bars are symmetrically fixed on the inner ring of the rotating ring, long slide holes are opened on the inner ring of the annular shell for each slide bar to pass through, and slide grooves corresponding to each slide bar are opened on the outer surface of the hollow column; When the annular shell moves along the axial direction of the hollow column, the sliding rod is driven to slide in the sliding groove, and the rotating ring is rotated in the annular shell through the cooperation of the sliding rod and the long sliding hole.

[0013] Optionally, the slide groove includes a first vertical groove and a second vertical groove parallel to each other, a first spiral groove is connected between the upper proximal end of the first vertical groove and the upper end of the second vertical groove, and a second spiral groove is connected between the lower end of the first vertical groove and the lower proximal end of the second vertical groove, and the second spiral groove is parallel to the first spiral groove.

[0014] The present invention also proposes a method for recovering waste heat from waste incineration flue gas, which is applicable to the above-mentioned waste incineration flue gas waste heat recovery device, and comprises the following steps: Step 1: First, inject normal temperature water into the middle heat exchange cavity; Step 2: The waste incineration flue gas enters the lower smoke inlet chamber through the pipeline; Step 3: The smoke in the lower smoke inlet cavity passes upward through each heat conducting pipe and is discharged through the upper smoke exhaust cavity; Step 4: When the flue gas passes through each heat transfer pipe, the heat in the flue gas is transferred to the normal temperature water in the middle heat exchange cavity through the heat transfer pipe, so as to realize waste heat recovery; part of the ash in the flue gas adheres to the inner surface of the heat transfer pipe; Step 5: When the inner surface of the heat conducting tube needs to be cleaned, the lifting mechanism drives each scraper to move downward, thereby scraping off the ash and slag attached to the inner surface of each heat conducting tube.

[0015] Compared with the prior art, the present invention provides a device and method for recovering waste heat from waste incineration flue gas, which has the following beneficial effects: 1. The present invention provides a heat-conducting pipe, a scraper and a lifting mechanism. When the waste heat of waste incineration flue gas is recovered, the flue gas passes through the heat-conducting pipe from bottom to top, and the particulate impurities in the flue gas adhere to the inner wall of the heat-conducting pipe; when the inner wall of the heat-conducting pipe needs to be cleaned, the scraper is driven downward by the lifting mechanism to pass through the inside of the heat-conducting pipe, thereby scraping off the impurities attached to the inner wall of the heat-conducting pipe to avoid affecting the heat transfer efficiency, thereby solving the problem of poor waste heat recovery effect of flue gas in the prior art.

[0016] 2. The present invention is provided with an annular shell, an upper connecting rod, an upper arc scraper, a lower connecting rod, a lower arc scraper and an adjustment component. When the annular shell located in the upper smoke exhaust chamber moves downward, the upper connecting rod and the lower connecting rod can be driven by the adjustment component to synchronously extend along the radial direction of the annular shell, so that the upper arc scraper and the lower arc scraper can fit with the inner surface of the heat conducting pipe, thereby being able to scrape off impurities attached to the inner surface of the heat conducting pipe; When the annular shell located in the lower smoke inlet chamber is reset upward, the upper connecting rod and the lower connecting rod smoke annular shell can be driven to shrink radially synchronously through the adjustment component, so that the upper arc scraper and the lower arc scraper are not in contact with the inner surface of the heat conduction pipe, and the inner surface of the heat conduction pipe is no longer scraped; The above structure is conducive to collecting and processing the scraped ash and avoids pushing impurities attached to the inner surface of the heat pipe upward into the upper smoke exhaust chamber or accumulating on the surface of the upper and lower arc scrapers. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure inside the recycling box of the present invention; Figure 2 This is a schematic diagram of the structure inside the installation shell of the present invention; Figure 3 for Figure 2 A local enlarged schematic diagram of the middle A; Figure 4 It is a structural schematic diagram of the screw rod of the present invention; Figure 5 It is a schematic diagram of the structure inside the hollow column of the present invention; Figure 6 It is a structural schematic diagram of the chute of the present invention; Figure 7 It is a structural schematic diagram of the screw sleeve of the present invention; Figure 8 It is a structural schematic diagram of the annular shell of the present invention; Fig. 9 It is a schematic structural diagram of the rotating ring of the present invention.

[0018] In the figure: 1, recovery box; 2, sealing partition; 3, upper smoke exhaust chamber; 4, middle heat exchange chamber; 5, lower smoke inlet chamber; 6, heat conduction pipe; 7, scraper; 701, annular shell; 702, upper connecting rod; 703, upper arc scraper; 704, lower connecting rod; 705, lower arc scraper; 8, lifting mechanism; 801, hollow column; 802, screw; 803, drive assembly; 8031, mounting shell; 8032, drive shaft; 8033, servo motor; 8034, driven bevel gear; 8035, driving bevel gear; 804, screw sleeve; 805, fixed Plate; 806, vertical strip hole; 9, fixing frame; 10, supporting frame; 11, first bellows; 12, second bellows; 13, adjusting assembly; 1301, rotating ring; 1302, upper ring; 1303, lower ring; 1304, upper arc-shaped adjusting hole; 1305, lower arc-shaped adjusting hole; 14, upper adjusting groove; 15, upper adjusting rod; 16, lower adjusting groove; 17, lower adjusting rod; 18, sliding rod; 19, long sliding hole; 20, sliding groove; 2001, first vertical groove; 2002, second vertical groove; 2003, first spiral groove; 2004, second spiral groove. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Example 1: Please refer to Figures 1 to 9 A waste incineration flue gas waste heat recovery device and method includes a recovery box 1, the outer surface of the recovery box 1 is covered with a heat preservation material, so that the heat inside the recovery box 1 is not easily lost.

[0021] This embodiment further includes: two sealing partitions 2 , a plurality of heat conducting pipes 6 , a plurality of scraping members 7 and a lifting mechanism 8 .

[0022] Among them, two sealing partitions 2 are fixed in the recovery box 2 at intervals along the vertical direction, and are used to divide the recovery box 1 into an upper smoke exhaust chamber 3, a middle heat exchange chamber 4 and a lower smoke inlet chamber 5. A smoke exhaust pipe connected to the upper smoke exhaust chamber 3 is fixed on the recovery box 1, which is used to discharge the smoke after heat exchange. A water inlet pipe and a drain pipe connected to the middle heat exchange chamber 4 are fixed on the recovery box 1, which are used to add normal temperature water to the middle heat exchange chamber 4, or to discharge the hot water after heat exchange for use in the factory. A smoke inlet pipe connected to the lower smoke inlet chamber 5 is fixed on the recovery box 1, which is used to input high-temperature smoke after garbage incineration. A slag discharge pipe connected to the lower smoke inlet chamber 5 is fixed at the bottom of the recovery box 1, which can discharge the scraped ash.

[0023] In this embodiment, the heat conducting tubes 6 are parallel and fixed between two sealing partitions 2 at intervals, so that the upper smoke exhaust chamber 3 and the lower smoke inlet chamber 5 are connected, so that the high-temperature smoke can pass through the heat conducting tubes 6 from bottom to top and exchange heat with the water stored in the middle heat exchange chamber 4. In order to improve the heat exchange capacity, a plurality of heat exchange fins can be fixed on the outer surface of each heat conducting tube 6, thereby increasing the heat transfer area and further improving the heat exchange capacity.

[0024] In addition, a plurality of scraper members 7 are arranged in the upper smoke exhaust chamber 3 and correspond to each heat conducting tube 6 one by one, and are used to scrape off the ash attached to the inner wall of the tube 6. The lifting mechanism 8 is arranged on the recovery box 1, and is used to drive each scraper member 7 to move along the axial direction of the corresponding heat conducting tube 6, so as to scrape off the ash.

[0025] The lifting mechanism 8 is described in detail below: A fixing frame 9 is fixed in the upper smoke exhaust chamber 3, and a supporting frame 10 is fixed in the lower smoke inlet chamber 5, which are used to fix and support other components in the device without affecting the normal circulation of smoke.

[0026] The lifting mechanism 8 includes a hollow column 801 fixed between the fixed frame 9 and the support frame 10 and passing through each heat conducting tube 6 one by one, a screw rod 802 located in each hollow column 801 is rotatably connected between the fixed frame 9 and the support frame 10, and a driving assembly 803 for driving each screw rod 802 to rotate synchronously is provided on the recycling box 1. In this embodiment, the driving assembly 803 includes a mounting shell 8031 ​​fixed on the fixed frame 9, a driving shaft 8032 arranged in a horizontal direction is rotatably connected in the mounting shell 8031, and a servo motor 8033 connected to the driving shaft 8032 is installed outside the recycling box 1 to drive the driving shaft 8032 to rotate forward or reverse. A driven bevel gear 8034 located in the mounting shell 8031 ​​is fixed at the upper end of each screw rod 802, and an active bevel gear 8035 meshing with each driven bevel gear 8034 is fixed on the driving shaft 8032. When the servo motor 8033 is working, it can drive the driving shaft 8032 to rotate forward or reverse, thereby driving the screw 802 to rotate forward or reverse through the cooperation of the driven bevel gear 8034 and the driving bevel gear 8035.

[0027] In another embodiment, multiple rows of heat pipes 5 are arranged along the front-to-back direction of the middle heat exchange cavity 4, and the high-temperature flue gas is dispersed into the multiple rows of heat pipes 5, which can effectively slow down the speed of the high-temperature flue gas and expand the heat transfer area, thereby improving the heat exchange capacity. In addition, each row of heat pipes 5 is provided with a corresponding servo motor 8033 and a corresponding transmission structure, so that a certain row of heat pipes 5 can be cleaned separately. During the cleaning process, the high-temperature flue gas can be recovered through other rows of heat pipes 5 for waste heat recovery, so that the device does not need to be shut down during the cleaning process.

[0028] A screw sleeve 804 located in the hollow column 801 is threadedly connected to each screw rod 802, and two symmetrical fixing plates 805 are fixed between the outer surface of each screw sleeve 804 and the scraper 7, and vertical strip holes 806 are provided on each hollow column 801 for the two fixing plates 805 to pass through one by one. Through the cooperation of the fixing plates 805 and the vertical strip holes 806, the screw sleeve 804 can only move along the axial direction of the screw rod 802, and cannot rotate with the screw rod 802; therefore, when the screw rod 802 rotates forward or reversely, the screw sleeve 804 can be driven to move downward or upward, thereby driving the scraper 7 to move downward along the axis of the hollow column 801 to clean the inner wall of the heat conduction pipe 6, or driving the scraper 7 to reset upward.

[0029] It is worth mentioning that a first bellows 11 located on the periphery of the hollow column 801 is fixed between the scraper 7 and the fixed frame 9, and a second bellows 12 located on the periphery of the hollow column 801 is fixed between the scraper 7 and the support frame 10. The first bellows 11 and the second bellows 12 are both made of high temperature resistant and heat insulating materials, such as aluminum foil, polypropylene, etc. The hollow column 801 can be protected to prevent particulate impurities in the flue gas from adhering to the grooves and holes on the surface of the hollow 801, or adhering to the surface of the screw 802 in the hollow column 801, so as to ensure that all components can be used normally. Moreover, under normal conditions, when the scraper 7 is located in the upper exhaust chamber 3, the high-temperature flue gas can only pass through the annular gap between the second bellows 12 and the heat conducting pipe 6, so that the heat can be better transferred to the water stored in the middle heat exchange chamber 4, effectively improving the heat recovery capacity.

[0030] The scraper 7 is described in detail below: The scraper 7 includes an annular shell 701 movably mounted on the outer periphery of the hollow column 801 and fixed to two corresponding fixed plates 805. When the screw 802 rotates, the annular shell 701 can be driven to move up and down along the hollow column 801. A plurality of upper connecting rods 702 are arranged at intervals along the circumferential direction in the annular shell 701. Each upper connecting rod 702 movably passes through the outer ring of the annular shell 701 and an upper arc-shaped scraper 703 is fixed to the outer end.

[0031] A plurality of lower connecting rods 704 are arranged at intervals along the circumferential direction in the annular shell 701 , each lower connecting rod 704 is located below the upper connecting rod 702 , each lower connecting rod 704 moves through the outer ring of the annular shell 701 and has a lower arc scraper 705 fixed on the outer end, and each lower arc scraper 705 is located below the upper arc scraper 703 .

[0032] An adjusting assembly 13 is provided in the annular shell 701 to enable each upper connecting rod 702 and each lower connecting rod 704 to synchronously extend and retract along the radial direction of the annular shell 701. When each upper connecting rod 702 and each lower connecting rod 704 are fully extended, each upper arc scraper 703 and each lower arc scraper 705 can fit with the inner surface of the heat pipe 6.

[0033] With the above structure, under normal conditions, the annular shell 701 is located in the upper smoke exhaust chamber 3, which does not affect the normal passage of smoke through the heat conducting pipe 6. When the inner wall of the heat conducting pipe 6 needs to be cleaned, the upper connecting rods 702 and the lower connecting rods 704 are fully extended through the adjustment component 13, so that the upper arc scrapers 703 and the lower arc scrapers 705 are unfolded and can fit with the inner surface of the heat conducting pipe 6; at this time, when the annular shell 701 moves downward along the hollow column 801 under the drive of the screw 802, the ash residue attached to the inner surface of the heat conducting pipe 6 can be scraped off by the upper arc scrapers 703 and the lower arc scrapers 70, and the scraped ash residue falls into the lower smoke inlet chamber 5, which is convenient for subsequent centralized discharge.

[0034] When the annular shell 701 completely passes through the heat-conducting tube 6 downward, the upper connecting rods 702 and the lower connecting rods 704 are driven to completely retract through the adjustment component 13, so that the upper arc scrapers 703 and the lower arc scrapers 705 are retracted and no longer fit the inner surface of the heat-conducting tube 6; at this time, when the annular shell 701 is driven by the screw 802 to move upward along the hollow column 801, the upper arc scrapers 703 and the lower arc scrapers 705 are no longer in contact with the inner surface of the heat-conducting tube 6, and therefore, the inner surface of the heat-conducting tube 6 is no longer scraped, thereby avoiding pushing impurities attached to the inner surface of the heat-conducting tube 6 upward into the upper smoke exhaust chamber 3, or accumulating on the surfaces of the upper arc scrapers 703 and the lower arc scrapers 705, which is not conducive to centralized treatment of the scraped ash.

[0035] It is worth mentioning that in this embodiment, two upper arc scrapers 703 are provided, and two lower arc scrapers 705 are provided. The two upper arc scrapers 703 and the two lower arc scrapers 705 are staggered and distributed with each other, and the central angles of each upper arc scraper 703 and each lower arc scraper 705 are 100°-120°, so that each upper arc scraper 703 and each lower arc scraper 705 cooperate with each other to form an annular scraping structure adapted to the inner surface of the heat pipe 6. This design can minimize the number of parts and ensure that when the annular shell 701 moves downward, the unfolded upper arc scraper 703 and the lower arc scraper 705 can fully clean the inner surface of the heat pipe 6 to avoid the existence of cleaning dead corners.

[0036] In this embodiment, the adjustment assembly 13 includes a rotating ring 1301 rotatably connected to the annular shell 701. The rotating ring 1301 is rotatably connected to the annular shell 701 through a damping bearing. With this connection method, the rotating ring 1301 is not easy to rotate in the annular shell 701 under normal conditions, thereby ensuring stability. An upper ring 1302 and a lower ring 1303 are fixed in sequence from top to bottom on the outer ring of the rotating ring 1301. When the rotating ring 1301 rotates, it can drive the upper ring 1302 and the lower ring 1303 to rotate synchronously. An upper arc-shaped adjustment hole 1304 corresponding to each upper connecting rod 702 is provided on the upper ring 1302, and an upper adjustment groove 14 is provided at the inner end of each upper connecting rod 702. An upper adjustment rod 15 that movably passes through the corresponding upper arc-shaped adjustment hole 1304 is fixed in each upper adjustment groove 14. When the upper ring 1302 rotates, it can drive the upper adjustment rod 15 to slide in the upper arc-shaped adjustment hole 1304, thereby driving the upper connecting rod 702 to extend or contract.

[0037] The lower ring 1303 is provided with lower arc-shaped adjustment holes 1305 corresponding to the lower connecting rods 704, and the inner end of each lower connecting rod 704 is provided with a lower adjustment groove 16. A lower adjustment rod 17 that movably passes through the corresponding lower arc-shaped adjustment hole 1305 is fixed in each lower adjustment groove 16. When the lower ring 1303 rotates, the lower adjustment rod 17 can be driven to slide in the lower arc-shaped adjustment hole 1305, thereby driving the lower connecting rod 704 to extend or contract.

[0038] When the rotating ring 1301 rotates to drive the upper ring 1302 and the lower ring 1303 to rotate synchronously, the upper connecting rod 702 is driven to telescopically move along the radial direction of the annular shell 701 through the cooperation of the upper adjusting rod 15 and the upper arc-shaped adjusting hole 1304; and the lower connecting rod 704 is driven to telescopically move along the radial direction of the annular shell 701 through the cooperation of the lower adjusting rod 17 and the lower arc-shaped adjusting hole 1305, so that the upper arc-shaped scraper 703 and the lower arc-shaped scraper 705 can be synchronously expanded or retracted, and can then be in contact with or not in contact with the inner surface of the heat pipe 6.

[0039] It should be noted that two slide bars 18 are symmetrically fixed on the inner ring of the rotating ring 1301, long slide holes 19 are provided on the inner ring of the annular shell 701 for each slide bar 18 to pass through, and slide grooves 20 corresponding to each slide bar 18 are provided on the outer surface of the hollow column 801. When the annular shell 701 moves along the axial direction of the hollow column 801, the slide bars 18 are driven to slide in the slide grooves 20, and the rotating ring 1301 is rotated in the annular shell 701 through the cooperation of the slide bars 18 and the long slide holes 19. With this structure, the rotating ring 1301 can be automatically driven to rotate without the need to set up an additional power structure.

[0040] It should be supplemented that the slide groove 20 includes a first vertical groove 2001 and a second vertical groove 2002 which are parallel to each other, a first spiral groove 2003 is connected between the upper proximal end of the first vertical groove 2001 and the upper end of the second vertical groove 2002, a second spiral groove 2004 is connected between the lower end of the first vertical groove 2001 and the lower proximal end of the second vertical groove 2002, and the second spiral groove 2004 is parallel to the first spiral groove 2003. The first spiral groove 2003 is located in the upper smoke exhaust cavity 3, and the second spiral groove 2004 is located in the lower smoke inlet cavity 5. Both the second spiral groove 2004 and the first spiral groove 2003 are large-pitch spirals, so when the slide bar 18 slides in the spiral groove, it can drive the slide bar 18 to rotate along the long slide hole 19, thereby driving the rotating ring 1301 to rotate in the annular shell 701.

[0041] With the above structure, when the annular shell 701 is located at the initial position in the upper smoke exhaust chamber 3, the slide rod 18 is located at the top of the first vertical groove 2001, the upper adjustment rod 15 is located at the outer edge of the upper ring 1302, and the lower adjustment rod 17 is located at the edge of the lower ring 1303; at this time, the upper arc scraper 703 and the lower arc scraper 705 are in the expanded state.

[0042] When the annular shell 701 moves downward along the hollow column 801 , it drives the slide bar 18 to slide in the first vertical groove 2001 , so that the upper arc scraper 703 and the lower arc scraper 705 are always in the expanded state, thereby scraping off the ash attached to the inner surface of the heat pipe 6 .

[0043] When the annular shell 701 passes through the heat conducting tube 6 and continues to move downward in the lower smoke inlet chamber 5, the slide bar 18 can be driven to slide in the first spiral groove 2004, thereby driving the rotating ring 1301 to rotate in the annular shell 701 through the cooperation of the slide bar 18 and the long slide hole 19; and then driving the upper ring 1302 and the lower ring 1303 to rotate synchronously, so that the adjustment rod slides in the corresponding adjustment hole, so that the upper adjustment rod 15 moves to the inner edge of the upper ring 1302, and the lower adjustment rod 17 moves to the inner edge of the lower ring 1303, and then the upper arc scraper 703 and the lower arc scraper 705 are retracted. At this time, the slide bar 18 moves into the second vertical groove 2002.

[0044] When the annular shell 701 moves upward, it drives the slide bar 18 to slide in the second vertical groove 2002 , so that the upper arc scraper 703 and the lower arc scraper 705 are always in a retracted state and no longer contact the inner surface of the heat pipe 6 .

[0045] When the annular shell 701 passes through the heat-conducting tube 6 and continues to move upward in the upper smoke inlet chamber 3, it can drive the slide rod 18 to slide in the first spiral groove 2003, thereby driving the rotating ring 1301 to rotate in the annular shell 701, and then the upper adjustment rod 15 moves to the outer edge of the upper ring 1302, and the lower adjustment rod 17 moves to the outer edge of the lower ring 1303, so that the upper arc scraper 703 and the lower arc scraper 705 are in an expanded state until the slide rod 18 moves into the first vertical groove 2001. Embodiment 2: The present invention also proposes a method for recovering waste heat from waste incineration flue gas, which is applicable to the waste incineration flue gas waste heat recovery device in Embodiment 1, and comprises the following steps: Step 1: first inject room temperature water into the middle heat exchange chamber 4; Step 2: The waste incineration flue gas enters the lower smoke inlet chamber 5 through the pipeline; Step 3: The smoke in the lower smoke inlet chamber 5 passes upward through the heat conducting pipes 6 and is discharged through the upper smoke exhaust chamber 3; Step 4: When the flue gas passes through each heat conducting pipe 6, the heat in the flue gas is transferred to the normal temperature water in the middle heat exchange chamber 4 through the heat conducting pipe 6, so as to realize waste heat recovery; part of the ash in the flue gas adheres to the inner surface of the heat conducting pipe 6; Step 5: When the inner surface of the heat conducting tube 6 needs to be cleaned, the lifting mechanism 8 drives each scraper 7 to move downward, thereby scraping off the ash and slag attached to the inner surface of each heat conducting tube 6.

[0046] When the scraper 7 moves downward, the upper arc scraper 703 and the lower arc scraper 705 are always in an extended state, so that they can contact the inner surface of the heat pipe 6, and then can completely scrape off the ash attached to the inner surface of the heat pipe 6. When the scraper 7 moves upward, the upper arc scraper 703 and the lower arc scraper 705 are always in a retracted state, and do not contact the inner surface of the heat pipe 6, so as to avoid pushing the impurities attached to the inner surface of the heat pipe 6 upward into the upper smoke exhaust cavity, or accumulating on the upper surface of the upper arc scraper 703 and the lower arc scraper 705.

[0047] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A waste incineration flue gas waste heat recovery device, comprising a recovery box (1), characterized in that: Also includes: Two sealing baffles (2), the two sealing baffles (2) are fixed in the recovery box (2) at intervals in the vertical direction, and are used to divide the recovery box (1) into an upper smoke exhaust chamber (3), a middle heat exchange chamber (4) and a lower smoke inlet chamber (5); A plurality of heat conducting pipes (6), each heat conducting pipe (6) being fixed in parallel and at intervals between two sealing partitions (2) so as to allow the upper smoke exhaust chamber (3) and the lower smoke inlet chamber (5) to communicate with each other; A plurality of scraper pieces (7), wherein the plurality of scraper pieces (7) are arranged in the upper smoke exhaust cavity (3) and correspond one to one to each of the heat conduction pipes (6); A lifting mechanism (8) is arranged on the recovery box (1) and is used to drive each scraper (7) to move along the axial direction of the corresponding heat conducting pipe (6).

2. The waste incineration flue gas waste heat recovery and utilization device according to claim 1 is characterized in that: A fixing frame (9) is fixed in the upper smoke exhaust chamber (3), and a supporting frame (10) is fixed in the lower smoke inlet chamber (5); The lifting mechanism (8) comprises a hollow column (801) fixed between the fixing frame (9) and the supporting frame (10) and passing through each heat conducting tube (6) one by one, a screw rod (802) located in each hollow column (801) is rotatably connected between the fixing frame (9) and the supporting frame (10), and a driving assembly (803) for driving each screw rod (802) to rotate synchronously is provided on the recovery box (1); A screw sleeve (804) located in the hollow column (801) is threadedly connected to each screw rod (802), two symmetrical fixing plates (805) are fixed between the outer surface of each screw sleeve (804) and the scraper (7), and each hollow column (801) is provided with vertical strip holes (806) for the two fixing plates (805) to pass through one by one.

3. The waste incineration flue gas waste heat recovery and utilization device according to claim 2 is characterized in that: The driving assembly (803) comprises a mounting shell (8031) fixed on a fixing frame (9), a driving shaft (8032) arranged in a horizontal direction being rotatably connected inside the mounting shell (8031), and a servo motor (8033) drivingly connected to the driving shaft (8032) being mounted outside the recovery box (1); A driven bevel gear (8034) located in a mounting shell (8031) is fixed at the upper end of each screw rod (802), and a driving bevel gear (8035) meshing with each driven bevel gear (8034) is fixed on the driving shaft (8032).

4. The waste incineration flue gas waste heat recovery and utilization device according to claim 2 is characterized in that: A first corrugated tube (11) located outside the hollow column (801) is fixed between the scraper (7) and the fixing frame (9), and a second corrugated tube (12) located outside the hollow column (801) is fixed between the scraper (7) and the supporting frame (10).

5. The waste incineration flue gas waste heat recovery and utilization device according to claim 2 is characterized in that: The scraper (7) comprises an annular shell (701) movably sleeved on the periphery of the hollow column (801) and fixed to two corresponding fixed plates (805), a plurality of upper connecting rods (702) are arranged in the annular shell (701) at intervals along the circumferential direction, each upper connecting rod (702) movably passes through the outer ring of the annular shell (701) and has an upper arc-shaped scraper (703) fixed to its outer end; A plurality of lower connecting rods (704) are arranged at intervals along the circumferential direction in the annular shell (701), each lower connecting rod (704) is located below the upper connecting rod (702), each lower connecting rod (704) movably passes through the outer ring of the annular shell (701) and has a lower arc-shaped scraper (705) fixed on the outer end, each lower arc-shaped scraper (705) is located below the upper arc-shaped scraper (703); An adjustment assembly (13) is provided in the annular shell (701) to enable each upper connecting rod (702) and each lower connecting rod (704) to synchronously extend and retract along the radial direction of the annular shell (701); When the upper connecting rods (702) and the lower connecting rods (704) are fully extended, the upper arc-shaped scrapers (703) and the lower arc-shaped scrapers (705) can fit with the inner surface of the heat-conducting pipe (6).

6. The waste incineration flue gas waste heat recovery and utilization device according to claim 5 is characterized in that: Two upper arc-shaped scrapers (703) are provided, and two lower arc-shaped scrapers (705) are provided. The two upper arc-shaped scrapers (703) and the two lower arc-shaped scrapers (705) are arranged in an interlaced manner, and the central angle of each upper arc-shaped scraper (703) and each lower arc-shaped scraper (705) is 100°-120°.

7. The waste incineration flue gas waste heat recovery and utilization device according to claim 5 is characterized in that: The adjustment assembly (13) comprises a rotating ring (1301) rotatably connected to the annular shell (701), and an upper ring (1302) and a lower ring (1303) are fixed on the outer ring of the rotating ring (1301) in order from top to bottom; An upper arc-shaped adjustment hole (1304) corresponding to each upper connecting rod (702) is formed on the upper ring (1302), an upper adjustment groove (14) is formed at the inner end of each upper connecting rod (702), and an upper adjustment rod (15) is fixed in each upper adjustment groove (14) and movably passes through the corresponding upper arc-shaped adjustment hole (1304); The lower ring (1303) is provided with lower arc-shaped adjustment holes (1305) corresponding to the lower connecting rods (704) one by one, the inner end of each lower connecting rod (704) is provided with a lower adjustment groove (16), and a lower adjustment rod (17) is fixed in each lower adjustment groove (16) and movably passes through the corresponding lower arc-shaped adjustment hole (1305); When the rotating ring (1301) rotates to drive the upper ring (1302) and the lower ring (1303) to rotate synchronously, the upper adjusting rod (15) and the upper arc-shaped adjusting hole (1304) cooperate to drive the upper connecting rod (702) to move telescopically in the radial direction of the annular shell (701); and the lower adjusting rod (17) and the lower arc-shaped adjusting hole (1305) cooperate to drive the lower connecting rod (704) to move telescopically in the radial direction of the annular shell (701).

8. The waste incineration flue gas waste heat recovery and utilization device according to claim 7 is characterized in that: Two slide bars (18) are symmetrically fixed on the inner ring of the rotating ring (1301), long slide holes (19) are provided on the inner ring of the annular shell (701) for the slide bars (18) to pass through one by one, and slide grooves (20) corresponding to the slide bars (18) are provided on the outer surface of the hollow column (801); When the annular shell (701) moves along the axial direction of the hollow column (801), the sliding rod (18) is driven to slide in the sliding groove (20), and the rotating ring (1301) is rotated in the annular shell (701) through the cooperation between the sliding rod (18) and the long sliding hole (19).

9. The waste incineration flue gas waste heat recovery and utilization device according to claim 8, characterized in that: The slide groove (20) comprises a first vertical groove (2001) and a second vertical groove (2002) which are parallel to each other, a first spiral groove (2003) is connected between the upper proximal end of the first vertical groove (2001) and the upper end of the second vertical groove (2002), a second spiral groove (2004) is connected between the lower end of the first vertical groove (2001) and the lower proximal end of the second vertical groove (2002), and the second spiral groove (2004) is parallel to the first spiral groove (2003).

10. A method for recovering waste heat from flue gas from garbage incineration, applicable to the waste heat recovery device for flue gas from garbage incineration as claimed in any one of claims 1 to 9, characterized in that: The steps include: Step 1: first inject room temperature water into the middle heat exchange chamber (4); Step 2: The waste incineration flue gas enters the lower smoke inlet chamber (5) through the pipeline; Step 3: The smoke in the lower smoke inlet chamber (5) passes upward through the heat conducting pipes (6) and is discharged through the upper smoke exhaust chamber (3); Step 4: When the flue gas passes through each heat conducting pipe (6), the heat in the flue gas is transferred to the normal temperature water in the middle heat exchange chamber (4) via the heat conducting pipe (6), thereby realizing waste heat recovery; part of the ash in the flue gas adheres to the inner surface of the heat conducting pipe (6); Step 5: When it is necessary to clean the inner surface of the heat conducting tube (6), the lifting mechanism (8) drives each scraper (7) to move downward, thereby scraping off the ash and slag attached to the inner surface of each heat conducting tube (6).

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