Energy-saving waste combustion waste heat recovery system

Abstract

This invention discloses an energy-saving waste combustion waste heat recovery system, belonging to the field of waste heat recovery systems. It includes a solid waste combustion furnace, a waste gas combustion furnace, a waste heat recovery device, an air preheater, an electrostatic precipitator, an induced draft fan, a desulfurization and denitrification device, and a chimney, connected in sequence. The waste heat recovery device includes a water tank, with a first square pipe vertically penetrating its interior. The bottom of the outer side of the first square pipe has an inlet pipe connected to the waste gas combustion furnace, and the top of the outer side of the first square pipe has an outlet pipe connected to the air preheater. A second square pipe is fixedly connected inside the first square pipe, forming a square gap between the outer side of the second square pipe and the inner side of the first square pipe. A protrusion is fixedly connected to the bottom of the second square pipe. This invention can clean the soot adhering to the inner wall of the first square pipe and the outer wall of the second square pipe when flue gas is not flowing, and temporarily store the cleaned soot to prevent it from being blown away and re-adhering to the inner wall of the pipes when flue gas is flowing.

Description

Technical Field

[0001] This invention relates to a waste heat recovery system, specifically an energy-saving waste combustion waste heat recovery system. Background Technology

[0002] With the tightening of energy supply, more and more people are advocating energy conservation and environmental protection. Cities generate a large amount of waste every day. In order to avoid serious pollution to the environment, this waste is usually incinerated. During the combustion process, a large amount of high-temperature flue gas is generated. In order to improve energy utilization efficiency and save unnecessary energy, waste heat recovery devices are usually added to the flue gas treatment process.

[0003] Existing common waste heat recovery devices typically introduce high-temperature flue gas into a boiler or water tank through a pipe, where it exchanges heat with water, thereby raising the water temperature. This not only lowers the temperature of the flue gas for easier subsequent treatment but also enables the production of hot water for surrounding hotels, inns, and other places with high hot water demand without using other energy sources.

[0004] However, prolonged flow of flue gas through pipes leaves soot adhering to the inner walls, which affects the heat exchange between the high-temperature flue gas and water. How to clean this soot and temporarily store it to prevent it from being blown away is a current challenge. Therefore, those skilled in the art have provided an energy-saving waste combustion waste heat recovery system to solve the problems mentioned in the background section. Summary of the Invention

[0005] The purpose of this invention is to provide an energy-saving waste combustion waste heat recovery system that can clean the soot adhering to the inner wall of the pipe when no flue gas is flowing, and temporarily store the cleaned soot to prevent it from being blown away and re-adhering to the inner wall of the pipe when flue gas is flowing, thereby solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An energy-saving waste combustion waste heat recovery system includes a solid waste combustion furnace, a waste gas combustion furnace, a waste heat recovery device, an air preheater, an electrostatic precipitator, an induced draft fan, a desulfurization and denitrification device, and a chimney, connected in sequence. The waste heat recovery device includes a water tank, and a first square tube is vertically installed inside the water tank. The bottom of the outer side of the first square tube is provided with an air inlet pipe connected to the waste gas combustion furnace, and the top of the outer side of the first square tube is provided with an air outlet pipe connected to the air preheater. A second square tube is fixedly connected inside the first square tube, and a square gap is formed between the outer side of the second square tube and the inner side of the first square tube. A protrusion is fixedly connected to the bottom of the second square tube, and a water flow limiting pipe is fixedly connected to both the top and bottom of the outer side of the second square tube and communicates with it. One end of the water flow limiting pipe passes through the first square tube and communicates with the inside of the water tank. An ash scraping component is provided in the square gap between the two water flow limiting pipes. A driving component is provided at the top of the first square tube to drive the ash scraping component to move up and down, and an ash receiving component is provided at the bottom of the inside of the first square tube.

[0008] This application can clean the soot adhering to the inner wall of the first square pipe and the outer wall of the second square pipe when the flue gas is not flowing, and temporarily store the cleaned soot to prevent it from being blown away and adhering to the inner wall of the pipe again when the flue gas is flowing.

[0009] As a further aspect of the present invention: the ash removal assembly specifically includes: an inner frame and an outer frame. The inner frame is fitted onto and contacts the outer side of the second square tube, and the outer frame is fitted onto the outside of the inner frame and contacts the inner side of the first square tube. A U-shaped groove is formed between the inner frame and the outer frame. Multiple evenly distributed connecting rods are provided inside the U-shaped groove, and the two ends of the connecting rods are fixedly connected to the inner frame and the outer frame, respectively.

[0010] The ash scraping component moves up and down under the drive of the drive component, and during the lifting and lowering process, the ash scraping component scrapes off the soot attached to the inner wall of the first square tube and the outer wall of the second square tube.

[0011] As a further embodiment of the present invention: a first spiral shovel block is symmetrically and fixedly connected to the top edge and bottom edge of the outer frame, and the first spiral shovel block contacts the inner side of the first square tube; a second spiral shovel block is symmetrically and fixedly connected to the top edge and bottom edge of the inner frame, and the second spiral shovel block contacts the outer side of the second square tube.

[0012] The first circular shovel block improves the ash removal effect of the ash removal assembly on the inner wall of the first square tube, while the second square tube improves the ash removal effect of the ash removal assembly on the outer wall of the second square tube.

[0013] As a further embodiment of the present invention: the drive assembly specifically includes: a drive box fixed to the top of the first square tube, a drive motor fixedly connected to the top of the drive box, a main drive gear fixedly connected to the bottom output end of the drive motor, auxiliary drive gears rotatably connected to both sides of the main drive gear, and the auxiliary drive gears meshing with the main drive gears; lead screws threadedly connected to the two corners of the top surface of the outer frame, the top of the lead screws passing through the first square tube and the drive box and fixedly connected to the auxiliary drive gears; a U-shaped extension plate fixedly connected to the inner wall of the first square tube near the bottom end, and the bottom end of the lead screws rotatably connected to the top surface of the U-shaped extension plate.

[0014] The drive components are configured to smoothly drive the ash removal component to move up and down to complete the ash removal work.

[0015] As a further embodiment of the present invention: guide optical shafts are provided through the other two corners of the top surface of the outer frame, and the top end of the guide optical shafts is fixed to the top end of the inner wall of the first square tube, and the bottom end of the guide optical shafts is fixed to the top surface of the U-shaped extension plate.

[0016] The setting of the guide optical axis can further ensure the accuracy of the lifting direction of the ash scraping assembly and avoid deviation that may affect the ash cleaning work.

[0017] As a further embodiment of the present invention: the ash receiving assembly specifically includes: a flip plate, the bottom end of the flip plate is hinged to the bottom end of the inner wall of the first square tube, and a triangular limiting block is fixedly connected to one side of the bottom end of the flip plate, and an oblique ash receiving pipe communicating with the first square tube is provided on the other side of the bottom end of the flip plate, and a limiting protrusion is fixedly connected to the inner wall of the first square tube, the limiting protrusion being used to abut against the flip plate when the flip plate flips and approaches the oblique ash receiving pipe.

[0018] The flip plate can expose the inclined ash receiving pipe for ash collection when the first square pipe is not filled with flue gas, and can block the inclined ash receiving pipe when the first square pipe is filled with flue gas to preserve the flue gas inside the inclined ash receiving pipe and prevent it from being blown away and causing secondary pollution.

[0019] As a further embodiment of the present invention: a sealing head is threadedly connected to one end of the oblique ash receiving pipe.

[0020] Simply unscrew the sealing head to clean the ash inside the angled ash inlet pipe.

[0021] As a further embodiment of the present invention, the angle between the flip plate and the horizontal plane is 30°-89°.

[0022] When the first square pipe is not filled with flue gas, the angle between the flip plate and the horizontal plane is 30°; when the first square pipe is filled with flue gas, the angle between the flip plate and the horizontal plane is 89°.

[0023] As a further embodiment of the present invention: the top of the outer side of the water tank is fixedly connected to an inlet communicating with it, and the bottom of the outer side of the water tank is fixedly connected to an outlet communicating with it.

[0024] The inlet is used to fill the water tank with water, and the outlet is used to drain the water from the tank.

[0025] As a further aspect of the present invention: a temperature sensor is fixedly connected to the inner wall of the water tank near the bottom.

[0026] The temperature sensor can detect the water temperature in the tank.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] 1. This application can clean the soot adhering to the inner wall of the first square pipe and the outer wall of the second square pipe when the flue gas is not flowing, and temporarily store the cleaned soot to prevent it from being blown away and adhering to the inner wall of the pipe again when the flue gas is flowing, thus causing secondary pollution.

[0029] 2. The high-temperature flue gas in this application can not only extend the flue gas passage time and give the flue gas a longer heat exchange time, but also allow the flue gas to contact the first square tube and the second square tube at the same time for heat exchange, thereby increasing the contact area and making the heat exchange efficiency of the flue gas higher. The protrusion can buffer the impact when the flue gas enters the gap and can disperse the flue gas into the surrounding gap.

[0030] 3. During the descent of the ash removal component of this application, the ash removed falls onto the tilting plate under the action of gravity and is guided by the tilting plate to the ash receiving pipe at an angle. During the ascent of the ash removal component, the ash removal component removes ash again, and the ash removed falls from the U-shaped groove into the ash receiving component below. The ash removal work can be completed in both the upper and lower directions, which improves the ash removal effect.

[0031] 4. The limiting protrusion of this application can limit the flipping angle of the flipping plate, ensuring that the flipping plate is always tilted to one side. This prevents the first square pipe from being filled with smoke. After the airflow disappears, the flipping plate can flip and fall smoothly under its own gravity to return to its original position and be supported by the triangular limiting block. Thus, it can guide the smoke ash while also sealing the air inlet pipe to prevent smoke ash from entering the air inlet pipe. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of an energy-saving waste incineration waste heat recovery system.

[0033] Figure 2 A schematic diagram of the structure of the flue gas passage for the waste heat recovery device in an energy-saving waste incineration waste heat recovery system;

[0034] Figure 3This is a schematic diagram of the structure of a waste heat recovery device in an energy-saving waste incineration waste heat recovery system without flue gas flow.

[0035] Figure 4 For energy-saving waste incineration waste heat recovery system Figure 2 Enlarged view of A in the middle;

[0036] Figure 5 For energy-saving waste incineration waste heat recovery system Figure 3 Enlarged view of B in the middle;

[0037] Figure 6 This is a combined view of the ash removal component and the loop-shaped extension plate in an energy-saving waste incineration waste heat recovery system.

[0038] Figure 7 This is a schematic diagram of the ash removal component in an energy-saving waste incineration waste heat recovery system.

[0039] Figure 8 This is an internal view of the drive box in an energy-saving waste incineration waste heat recovery system.

[0040] In the diagram: 1. Solid waste incinerator; 2. Waste gas incinerator; 3. Waste heat recovery device; 4. Air preheater; 5. Electrostatic precipitator / bag filter; 6. Exhaust fan; 7. Desulfurization and denitrification device; 8. Chimney; 9. Water tank; 10. First square tube; 11. Inlet pipe; 12. Outlet pipe; 13. Second square tube; 14. Protruding head; 15. Water flow limit pipe; 16. Drive box; 17. Lead screw; 18. Tilting plate; 19. Triangular limit block; 20. Recurved extension plate; 21. Ash receiving pipe; 22. Sealing head; 23. Guide optical axis; 24. Ash scraping assembly; 25. Outer frame; 26. Inner frame; 27. First recurved shovel block; 28. Second recurved shovel block; 29. ​​Recurved groove; 30. Connecting rod; 31. Drive motor; 32. Main transmission gear; 33. Secondary transmission gear; 34. Water inlet; 35. Water outlet; 36. Limiting protrusion; 37. Temperature sensor. Detailed Implementation

[0041] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0042] Please see Figures 1-8In this embodiment of the invention, the energy-saving waste combustion waste heat recovery system includes a solid waste incinerator 1, a waste gas incinerator 2, a waste heat recovery device 3, an air preheater 4, an electrostatic precipitator 5, an induced draft fan 6, a desulfurization and denitrification device 7, and a chimney 8 connected in sequence. The waste heat recovery device 3 includes a water tank 9, and a first square pipe 10 is vertically installed inside the water tank 9. The bottom end of the outer side of the first square pipe 10 is provided with an air inlet pipe 11 connected to the waste gas incinerator 2, and the top end of the outer side of the first square pipe 10 is provided with an air outlet pipe 12 connected to the air preheater 4. A second square pipe is fixedly connected inside the first square pipe 10. The first square pipe 10 has a square gap between its outer surface and the inner surface of the second square pipe 13. A protrusion 14 is fixedly connected to the bottom end of the second square pipe 13, and a water-passing limiting pipe 15 is fixedly connected to both the top and bottom ends of its outer surface. One end of the water-passing limiting pipe 15 passes through the first square pipe 10 and communicates with the inside of the water tank 9. A ash-removing component 24 is provided in the square gap between the two water-passing limiting pipes 15. A driving component is provided at the top of the first square pipe 10 to drive the ash-removing component 24 to move up and down, and an ash-receiving component is provided at the bottom end of the inside of the first square pipe 10. This application can clean the soot adhering to the inner wall of the first square pipe 10 and the outer wall of the second square pipe 13 when flue gas is not flowing, and temporarily store the cleaned soot to prevent it from being blown away and re-adhering to the inner wall of the pipe when flue gas is flowing.

[0043] In this embodiment, the ash-scraping assembly 24 specifically includes an inner frame 26 and an outer frame 25. The inner frame 26 is fitted onto and contacts the outer side of the second square tube 13, while the outer frame 25 is fitted onto the outside of the inner frame 26 and contacts the inner side of the first square tube 10. A U-shaped groove 29 is formed between the inner frame 26 and the outer frame 25. Multiple evenly distributed connecting rods 30 are provided inside the U-shaped groove 29, and both ends of the connecting rods 30 are fixedly connected to the inner frame 26 and the outer frame 25, respectively. The ash-scraping assembly 24 moves up and down under the driving action of the driving assembly, and during this process, it scrapes off the ash adhering to the inner wall of the first square tube 10 and the outer wall of the second square tube 13.

[0044] In this embodiment: A first spiral-shaped shovel block 27 is symmetrically and fixedly connected to the top and bottom edges of the outer frame 25, and the first spiral-shaped shovel block 27 contacts the inner side of the first square tube 10. A second spiral-shaped shovel block 28 is symmetrically and fixedly connected to the top and bottom edges of the inner frame 26, and the second spiral-shaped shovel block 28 contacts the outer side of the second square tube 13. The first spiral-shaped shovel block 27 improves the ash removal effect of the ash removal assembly 24 on the inner wall of the first square tube 10, and the second square tube 13 improves the ash removal effect of the ash removal assembly 24 on the outer wall of the second square tube 13.

[0045] In this embodiment, the drive assembly specifically includes: a drive box 16 fixed to the top of the first square tube 10; a drive motor 31 fixedly connected to the top of the drive box 16; a main drive gear 32 fixedly connected to the bottom output end of the drive motor 31; secondary drive gears 33 rotatably connected to both sides of the main drive gear 32; the secondary drive gears 33 meshing with the main drive gear 32; lead screws 17 threadedly connected to the two corners of the top surface of the outer frame 25; the top of the lead screws 17 passing through the first square tube 10 and the drive box 16 and fixedly connected to the secondary drive gears 33; a U-shaped extension plate 20 fixedly connected to the inner wall of the first square tube 10 near the bottom; and the bottom end of the lead screws 17 rotatably connected to the top surface of the U-shaped extension plate 20. The drive assembly enables the ash-scraping assembly 24 to smoothly move up and down to complete the ash-cleaning work.

[0046] In this embodiment, guide optical shafts 23 are provided through the other two corners of the top surface of the outer frame 25. The top end of the guide optical shaft 23 is fixed to the top end of the inner wall of the first square tube 10, and the bottom end of the guide optical shaft 23 is fixed to the top surface of the U-shaped extension plate 20. The setting of the guide optical shaft 23 can further ensure the accuracy of the lifting direction of the ash removal assembly 24 and avoid deviation that would affect the ash removal work.

[0047] In this embodiment, the ash-collecting assembly specifically includes: a flip plate 18, the bottom end of which is hinged to the bottom end of the inner wall of the first square tube 10, and a triangular limiting block 19 is fixedly connected to one side of the bottom end of the flip plate 18. The other side of the bottom end of the flip plate 18 is provided with an inclined ash-collecting pipe 21 communicating with the first square tube 10, and a limiting protrusion 36 is fixedly connected to the inner wall of the first square tube 10. The limiting protrusion 36 is used to abut against the flip plate 18 when it flips towards the inclined ash-collecting pipe 21. The flip plate 18 can expose the inclined ash-collecting pipe 21 for ash collection when the first square tube 10 is not filled with flue gas, and can block the inclined ash-collecting pipe 21 to preserve the ash inside the pipe and prevent it from being blown away and causing secondary pollution when the first square tube 10 is filled with flue gas.

[0048] In this embodiment, a sealing head 22 is threaded to one end of the inclined ash receiving pipe 21. The ash inside the inclined ash receiving pipe 21 can be cleaned by unscrewing the sealing head 22.

[0049] In this embodiment, the angle between the flip plate 18 and the horizontal plane is 30°-89°. When the first square pipe 10 is not filled with flue gas, the angle between the flip plate 18 and the horizontal plane is 30°; when the first square pipe 10 is filled with flue gas, the angle between the flip plate 18 and the horizontal plane is 89°.

[0050] In this embodiment: a water inlet 34 is fixedly connected to the top of the outer side of the water tank 9 and communicates with it, and a water outlet 35 is fixedly connected to the bottom of the outer side of the water tank 9 and communicates with it. The water inlet 34 is used to introduce water into the water tank 9, and the water outlet 35 is used to discharge water from the water tank 9.

[0051] In this embodiment, a temperature sensor 37 is fixedly connected to the inner wall of the water tank 9 near the bottom. The temperature sensor 37 can detect the water temperature in the water tank 9.

[0052] The working principle of this invention is as follows: In use, combustible solid waste is crushed, screened, mixed, and formulated into fuel before being fed into the solid waste combustion furnace 1 for combustion. The resulting high-temperature flue gas enters the waste gas combustion furnace 2, where it is mixed with other waste gases introduced into the furnace and ignited for complete combustion. The high-temperature flue gas leaves the furnace and enters the waste heat recovery device 3 for waste heat recovery. After waste heat recovery, the flue gas is cooled to 200°C and enters the air preheater 4 to further heat the introduced air. The flue gas, with its temperature dropping below 150°C, is then filtered by the electrostatic precipitator 5. After filtration, the flue gas is pressurized by the induced draft fan 6 and sent to the desulfurization and denitrification device 7 to remove sulfur dioxide and nitrogen oxides. The clean flue gas is then discharged through the chimney 8 in compliance with emission standards (dust < 20 mg / m3, sulfur dioxide < 50 mg / m3, nitrogen oxides < 100 mg / m3).

[0053] It should be noted that the specific process of waste heat recovery is as follows: High-temperature flue gas is introduced into the first square tube 10 from the inlet pipe 11. The flue gas has a huge airflow, which flips the flip plate 18 to contact the limiting protrusion 36. At this time, the angle between the flip plate 18 and the horizontal plane is 89°. Then, the flue gas passes through the gap between the first square tube 10 and the second square tube 13 and is discharged from the outlet pipe 12 into the air preheater 4. The flue gas passing through the gap can not only prolong the flue gas passage time and give the flue gas a longer heat exchange time, but also allow the flue gas to contact the first square tube 10 and the second square tube 13 at the same time for heat exchange, increasing the contact area and thus making the heat exchange efficiency of the flue gas higher. The protrusion 14 can buffer the impact when the flue gas enters the gap and can disperse the flue gas into the surrounding gaps. During the whole process, the first square tube 10 exchanges heat with the water in the water tank 9, while the second square tube 13 exchanges heat with the water inside it. The water inside the second square tube 13 flows into it through the water limiting pipe 15. When the first square tube 10 is no longer vented with flue gas, the tilting plate 18 flips and falls back to its original position under its own weight, supported by the triangular limiting block 19. The tilting plate 18 forms a 30° angle with the horizontal plane. At this time, the drive motor 31 in the drive box 16 drives the main transmission gear 32 to rotate clockwise, which in turn drives the auxiliary transmission gear 33 and the lead screw 17 to rotate counterclockwise. The rotating lead screw 17 drives the entire ash scraping assembly 24 to slowly descend. During the descent, the outer frame 25, the lead screw 17, and the guide shaft 23 undergo relative displacement. Meanwhile, the first spiral shovel block 27 and the second spiral shovel block 28 respectively impact the inner wall of the first square tube 10 and the second square tube 10. The soot on the outer wall of the square tube 13 is removed. The removed soot falls onto the tilting plate 18 under gravity and is guided by the tilting plate 18 to the inclined ash receiving pipe 21. The ash removal assembly 24 descends to a certain height and is blocked by the water flow limiting pipe 15 below, preventing it from descending further. At this time, the drive motor 31 runs in reverse, driving the main drive gear 32 to rotate counterclockwise, slowly raising the entire ash removal assembly 24 until it touches the water flow limiting pipe 15 above. During the rising process, the first loop-shaped shovel block 27 and the second loop-shaped shovel block 28 on the ash removal assembly 24 remove ash again, and the removed ash falls from the loop groove 29 into the ash receiving assembly below. When the first square tube 10 is vented with flue gas again, the flue gas flow will flip the tilting plate 18 to a position with an angle of 89° with the horizontal plane. At this time, the tilting plate 18 blocks the inlet of the inclined ash receiving pipe 21, preventing the airflow from blowing up the soot in the inclined ash receiving pipe 21 and causing secondary pollution.

[0054] During the waste heat recovery process, the water temperature in the water tank 9 continues to rise. The temperature sensor 37 is connected to the external control terminal. When the temperature sensor 37 detects that the water temperature in the water tank 9 reaches the preset temperature of the control terminal, the water in the water tank 9 is discharged from the outlet 35 and sent to various water-using places. During the process, the water inside the second square pipe 13 flows out from the lower water flow limit pipe 15.

[0055] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

[0056] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An energy-saving waste combustion waste heat recovery system, comprising a solid waste combustion furnace (1), a waste gas combustion furnace (2), a waste heat recovery device (3), an air preheater (4), an electrostatic precipitator (5), an induced draft fan (6), a desulfurization and denitrification device (7), and a chimney (8) connected in sequence, characterized in that, The waste heat recovery device (3) includes a water tank (9), and a first square tube (10) is vertically installed inside the water tank (9). The bottom of the outer side of the first square tube (10) is provided with an air inlet pipe (11) connected to the waste gas combustion furnace (2), and the top of the outer side of the first square tube (10) is provided with an air outlet pipe (12) connected to the air preheater (4). The first square tube (10) is fixedly connected to the inside of the second square tube (13), and a square gap is formed between the outer side of the second square tube (13) and the inner side of the first square tube (10). The bottom end of the second square tube (13) is fixedly connected to the protrusion (14), and the top and bottom ends of the outer side of the second square tube (13) are fixedly connected to the water flow limiting tube (15) communicating with it. One end of the water flow limiting tube (15) passes through the first square tube (10) and communicates with the inside of the water tank (9). A shovel assembly (24) is provided in the square gap between the two water flow limiting tubes (15). The top end of the first square tube (10) is provided with a driving assembly to drive the shovel assembly (24) to move up and down. The bottom end of the inside of the first square tube (10) is provided with a ash receiving assembly. The ash removal assembly (24) specifically includes an inner frame (26) and an outer frame (25). The inner frame (26) is fitted onto the outer side of the second square tube (13) and contacts it. The outer frame (25) is fitted onto the outside of the inner frame (26) and contacts the inner side of the first square tube (10). A loop groove (29) is formed between the inner frame (26) and the outer frame (25). The loop groove (29) is provided with multiple evenly distributed connecting rods (30), and the two ends of the connecting rods (30) are fixedly connected to the inner frame (26) and the outer frame (25) respectively.

2. The energy-saving waste combustion waste heat recovery system according to claim 1, characterized in that, The top and bottom edges of the outer frame (25) are symmetrically and fixedly connected with a first spiral shovel block (27), and the first spiral shovel block (27) contacts the inner side of the first square tube (10). The top and bottom edges of the inner frame (26) are symmetrically and fixedly connected with a second spiral shovel block (28), and the second spiral shovel block (28) contacts the outer side of the second square tube (13).

3. The energy-saving waste combustion waste heat recovery system according to claim 2, characterized in that, The drive assembly specifically includes: a drive box (16) fixed to the top of the first square tube (10), a drive motor (31) fixedly connected to the top of the drive box (16), and a main drive gear (32) fixedly connected to the bottom output end of the drive motor (31). A secondary drive gear (33) is rotatably connected to both sides of the main drive gear (32), and the secondary drive gear (33) meshes with the main drive gear (32). A lead screw (17) is threaded through and threaded to the two corners of the top surface of the outer frame (25), and the top of the lead screw (17) passes through the first square tube (10) and the drive box (16) and is fixedly connected to the secondary drive gear (33). A loop extension plate (20) is fixedly connected to the inner wall of the first square tube (10) near the bottom end, and the bottom end of the lead screw (17) is rotatably connected to the top surface of the loop extension plate (20).

4. The energy-saving waste combustion waste heat recovery system according to claim 3, characterized in that, The other two corners of the top surface of the outer frame (25) are provided with guide optical shafts (23), and the top end of the guide optical shafts (23) is fixed to the top end of the inner wall of the first square tube (10), and the bottom end of the guide optical shafts (23) is fixed to the top surface of the spiral extension plate (20).

5. The energy-saving waste combustion waste heat recovery system according to claim 1, characterized in that, The ash receiving assembly specifically includes: a flip plate (18), the bottom end of the flip plate (18) is hinged to the bottom end of the inner wall of the first square tube (10), and a triangular limiting block (19) is fixedly connected to one side of the bottom end of the flip plate (18). An oblique ash receiving pipe (21) communicating with the first square tube (10) is provided on the other side of the bottom end of the flip plate (18), and a limiting protrusion (36) is fixedly connected to the inner wall of the first square tube (10). The limiting protrusion (36) is used to abut the flip plate (18) when the flip plate (18) flips and approaches the oblique ash receiving pipe (21).

6. The energy-saving waste combustion waste heat recovery system according to claim 5, characterized in that, One end of the oblique ash inlet pipe (21) is threaded with a sealing head (22).

7. The energy-saving waste combustion waste heat recovery system according to claim 6, characterized in that, The angle between the flip plate (18) and the horizontal plane is 30°-89°.

8. The energy-saving waste combustion waste heat recovery system according to claim 1, characterized in that, The top of the outer side of the water tank (9) is fixedly connected to an inlet (34) communicating with it, and the bottom of the outer side of the water tank (9) is fixedly connected to an outlet (35) communicating with it.

9. The energy-saving waste combustion waste heat recovery system according to claim 1, characterized in that, A temperature sensor (37) is fixedly connected to the inner wall of the water tank (9) near the bottom.

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