Multi-stage waste heat recovery device

Abstract

The invention relates to the technical field of energy recovery and energy conservation, and particularly discloses a multistage preheating recovery device which comprises a mounting platform, a first recovery box is fixedly connected to the top of the mounting platform, and multiple sets of supporting frames are fixedly connected to the position, located on one side of the first recovery box, of the top of the mounting platform; through the arrangement of the mounting platform, the multi-stage recovery box and the filter box, a multi-stage preheating recovery structure from a flue gas inlet to a flue gas outlet is formed, so that heat can be released step by step in the flowing process of flue gas and is effectively absorbed by the recovery box at each stage, and meanwhile, through the synergistic effect of the first connecting pipe, the second connecting pipe and the electromagnetic valve, the heat exchange efficiency is improved. According to the flue gas waste heat recovery device, intelligent adjustment of flue gas flow is achieved, damage to equipment caused by too high flue gas temperature is avoided, in addition, the heat exchange efficiency is enhanced through the rotary design of the turbine and the heat absorption column, the waste heat recovery rate is further increased, and therefore the effects of efficiently recovering flue gas waste heat and improving the energy utilization efficiency are achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy recovery and energy saving, and in particular relates to a multi-stage waste heat recovery device. Background Art

[0002] In the field of energy recovery and energy-saving technology, flue gas waste heat recovery technology has always been one of the research hotspots. With the continuous development of industrial production, a large amount of high-temperature flue gas carries a large amount of heat energy during the emission process. If this heat energy is not effectively utilized, it will not only cause a huge waste of energy, but also have adverse effects on the environment. Therefore, it is particularly important to develop efficient and reliable flue gas waste heat recovery devices.

[0003] At present, there are many flue gas waste heat recovery devices on the market. Most of these devices adopt a heat exchanger structure to transfer the heat in the flue gas to other working fluids through the heat exchanger, thereby realizing heat recovery and utilization. However, the existing technology still has some shortcomings in practical applications. Specifically, many existing flue gas waste heat recovery devices often adopt a single-stage recovery structure. Although this structure is simple, its heat recovery efficiency is limited and it cannot fully realize the cascade utilization of flue gas waste heat. In addition, some devices lack an effective temperature control mechanism when dealing with high-temperature flue gas, which can easily lead to equipment damage or reduced recovery efficiency due to excessively high flue gas temperature. These problems limit the further improvement of existing flue gas waste heat recovery devices in energy utilization efficiency and system stability, and therefore require staff to improve them. Summary of the Invention

[0004] The object of the present invention is to provide a multi-stage waste heat recovery device to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A multi-stage waste heat recovery device, comprising:

[0007] Installation platform;

[0008] The top of the mounting platform is fixedly connected to a first recovery box, the top of the mounting platform is located on one side of the first recovery box and is fixedly connected to a plurality of support frames, and the top of the support frames is fixedly connected to the second recovery box, the third recovery box and the filter box in order from low to high;

[0009] A first connecting tube is fixedly connected to the bottom of the surface of the first recovery box, one end of the first connecting tube is fixedly connected to the smoke inlet pipe, and second connecting tubes are fixedly connected to both sides of the connection between the first connecting tube and the smoke inlet pipe, a first solenoid valve is installed on the inner wall of the second connecting tube, and a first temperature sensor is fixedly connected to the inner wall of the smoke inlet pipe;

[0010] The inner wall of the first recovery box is fixedly connected to a connecting disk, the front ends of the first connecting tube and the second connecting tube are respectively fixedly connected to connecting tubes, and the front ends of the connecting tubes are fixedly connected to the surface of the connecting disk, the inner wall of the connecting disk is rotatably connected to a rotating rod, the surface of the rotating rod is fixedly connected to a turbine, the top of the rotating rod is fixedly connected to a heat absorbing column, and the inner wall of the heat absorbing column is penetrated by a plurality of smoke holes.

[0011] Preferably, the top of the connecting plate is fixedly connected to a thermal insulation tube, the surface of the heat-absorbing column is fixedly connected to a bearing ring, and the surface of the bearing ring is fixedly connected to the inner wall of the thermal insulation tube.

[0012] Preferably, the tops of the first recycling box, the second recycling box and the third recycling box are all fixedly connected to a heating box, the bottom of the heating box is fixedly connected to a heat-absorbing rod, the surface of the heat-absorbing rod is fixedly connected to multiple groups of heat-absorbing tubes, and the surfaces of the heat-absorbing rod and the heat-absorbing tube are both plugged into the inner wall of the heat-absorbing column, the top of the heat-absorbing rod is fixedly connected to a threaded heat dissipation tube, and the surface of the threaded heat dissipation tube is plugged into the inner wall of the heating box.

[0013] Preferably, a protective box is fixedly connected to the surface of the heating box, a driving motor is fixedly connected to the inner wall of the protective box, a driving rod is installed at the output end of the driving motor, a plurality of stirring blades are fixedly connected to the surface of the driving rod, and the surface of the stirring blades is inserted into the inner wall of the heating box.

[0014] Preferably, a feed pipe is fixedly connected to the top of the heating box, a discharge pipe is fixedly connected to the bottom of the heating box, and a valve is rotatably connected to the inner wall of the discharge pipe.

[0015] Preferably, the first recycling box, the second recycling box, the third recycling box and one side of the filter box are all fixedly connected with a second temperature sensor, and the top of the back of the first recycling box, the second recycling box and the third recycling box are all fixedly connected with a plurality of connecting pipes, the inner wall of the connecting pipe is installed with a second solenoid valve, and the top of the connecting pipe on the back of the first recycling box is fixedly connected to the bottom of the second recycling box, the top of the connecting pipe on the back of the second recycling box is fixedly connected to the bottom of the third recycling box, and the top of the connecting pipe on the back of the third recycling box is fixedly connected to the bottom of the filter box.

[0016] Preferably, a filter core is fixedly connected to the inner wall of the filter box, a smoke exhaust pipe is fixedly connected to the top of the back of the filter box, a third solenoid valve is installed on the inner wall of the smoke exhaust pipe, and multiple groups of support rods are fixedly connected to the bottom of the mounting platform.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) By installing the platform, multi-stage recovery box and filter box, a multi-stage waste heat recovery structure is formed from the flue gas inlet to the outlet, so that the flue gas can release heat step by step during the flow process and be effectively absorbed by the recovery boxes at each level. At the same time, through the coordinated action of the first connecting pipe, the second connecting pipe and the solenoid valve, the intelligent adjustment of the flue gas flow rate is realized, avoiding damage to the equipment caused by excessively high flue gas temperature. In addition, the rotating design of the turbine and the heat absorption column enhances the heat exchange efficiency and further improves the waste heat recovery rate, thereby achieving the effect of efficiently recovering flue gas waste heat and improving energy utilization efficiency.

[0019] (2) Through the arrangement of the heating box, heat absorbing rod, heat absorbing tube, threaded heat dissipation tube, driving motor and stirring blade, efficient heat transfer and utilization are achieved. The heat absorbing rod and heat absorbing tube at the bottom of the heating box are directly inserted into the heat absorbing column, effectively absorbing the waste heat of the flue gas and the heat of the heat absorbing column, and transferring the heat to the inside of the heating box through the threaded heat dissipation tube. The driving motor drives the stirring blade to rotate, so that the material in the heating box is heated evenly, avoiding the occurrence of local overheating or agglomeration. It not only improves the heat exchange efficiency, but also ensures the uniformity of material heating, thereby achieving the effect of maximizing the recovery of waste heat from flue gas and using it for material heating, and further improving energy utilization efficiency.

[0020] (3) Through the setting of the second temperature sensor, connecting pipe, solenoid valve, smoke exhaust pipe and support rod, the precise control of flue gas temperature and the safe and stable operation of the system are achieved. The second temperature sensor monitors the flue gas temperature in the recovery boxes at each level in real time and feeds the data back to the control system, providing a basis for the intelligent adjustment of the solenoid valve. The connecting pipe connects the recovery boxes at each level to form a flue gas flow channel. The solenoid valve intelligently adjusts the flue gas flow according to the temperature data to ensure the balanced recovery of heat. The solenoid valve in the smoke exhaust pipe controls the emission rate to avoid system pressure fluctuations. The support rod provides a solid support for the installation platform to ensure the stability of the overall operation of the device, thereby achieving the effects of precise control of flue gas temperature, efficient multi-stage heat recovery and safe and stable operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A perspective view of the present invention;

[0022] Figure 2 is a three-dimensional diagram of the first recycling box of the present invention;

[0023] Figure 3 A perspective view of the thermal insulation pipe of the present invention;

[0024] Figure 4 A three-dimensional diagram of a heat-absorbing column according to the present invention;

[0025] Figure 5 is a perspective view of the turbine of the present invention;

[0026] Figure 6 A three-dimensional diagram of a threaded heat dissipation pipe according to the present invention;

[0027] Figure 7 A three-dimensional diagram of a stirring blade according to the present invention;

[0028] In the figure: 1. Installation platform; 2. First recycling box; 3. Support frame; 4. Second recycling box; 5. Third recycling box; 6. Filter box; 7. First connecting pipe; 8. Smoke inlet pipe; 9. Second connecting pipe; 10. First solenoid valve; 11. First temperature sensor; 12. Connecting plate; 13. Connecting pipe; 14. Rotating rod; 15. Turbine; 16. Heat absorbing column; 17. Smoke vent; 18. Insulation pipe; 19. Bearing ring; 20. Heating box; 21. Heat absorbing rod; 22. Heat absorbing pipe; 23. Threaded heat dissipation pipe; 24. Protective box; 25. Drive motor; 26. Drive rod; 27. Stirring blade; 28. Feed pipe; 29. ​​Discharge pipe; 30. Valve; 31. Second temperature sensor; 32. Connecting pipe; 33. Second solenoid valve; 34. Smoke exhaust pipe; 35. Third solenoid valve; 36. Support rod. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0030] Example 1:

[0031] See also Figures 1 to 7 A multi-stage waste heat recovery device is shown, comprising: a mounting platform 1;

[0032] The top of the mounting platform 1 is fixedly connected to a first recovery box 2. The top of the mounting platform 1 is located on one side of the first recovery box 2 and is fixedly connected to multiple sets of support frames 3. The tops of the support frames 3 are fixedly connected to the second recovery box 4, the third recovery box 5 and the filter box 6 in order from low to high.

[0033] A first connecting pipe 7 is fixedly connected to the bottom of the surface of the first recovery box 2, one end of the first connecting pipe 7 is fixedly connected to the smoke inlet pipe 8, and second connecting pipes 9 are fixedly connected on both sides of the connection between the first connecting pipe 7 and the smoke inlet pipe 8. A first solenoid valve 10 is installed on the inner wall of the second connecting pipe 9, and a first temperature sensor 11 is fixedly connected to the inner wall of the smoke inlet pipe 8;

[0034] The inner wall of the first recovery box 2 is fixedly connected to a connecting disk 12, and the front ends of the first connecting tube 7 and the second connecting tube 9 are respectively fixedly connected to a connecting tube 13, and the front end of the connecting tube 13 is fixedly connected to the surface of the connecting disk 12, and the inner wall of the connecting disk 12 is rotatably connected to a rotating rod 14, and the surface of the rotating rod 14 is fixedly connected to a turbine 15, and the top of the rotating rod 14 is fixedly connected to a heat-absorbing column 16, and the inner wall of the heat-absorbing column 16 is penetrated by a plurality of groups of smoke holes 17, and the top of the connecting disk 12 is fixedly connected to an insulation tube 18, and the surface of the heat-absorbing column 16 is fixedly connected to a bearing ring 19, and the surface of the bearing ring 19 is fixedly connected to the inner wall of the insulation tube 18.

[0035] When in use, the installation platform 1 is used as the basic support, the top is fixedly connected to the first recovery box 2, and the second recovery box 4, the third recovery box 5 and the filter box 6 are supported in sequence by the support frame 3 to form a multi-level structure. The first recovery box 2 is connected to the smoke inlet pipe 8 through the first connecting pipe 7. The first temperature sensor 11 is set in the smoke inlet pipe 8 to monitor the smoke temperature. If the temperature is moderate, the first solenoid valve 10 controls the smoke to be transported simultaneously through the first connecting pipe 7 and the second connecting pipes 9 on both sides; if the temperature is too high, part of the second connecting pipe 9 is closed, and the smoke is transported only through the first connecting pipe 7 or an additional second connecting pipe 9 to adjust the flow to avoid Overheating damage, the flue gas enters the connecting disk 12 through the connecting pipe 13, impacts the turbine 15 to make it rotate, and the turbine 15 drives the rotating rod 14 and the heat-absorbing column 16 to rotate. The heat-absorbing column 16 is provided with multiple groups of smoke holes 17 to enhance the heat exchange efficiency. The heat-absorbing column 16 is connected to the insulation pipe 18 through the bearing ring 19 to reduce heat loss. The first recovery box 2, the second recovery box 4 and the third recovery box 5 have the same internal structure, and all realize multi-stage recovery of flue gas waste heat through the heat-absorbing column 16 and the smoke holes 17. Finally, the flue gas is discharged after purification through the filter box 6. The overall device recovers flue gas waste heat efficiently and improves energy utilization through multi-stage recovery and temperature control.

[0036] Example 2:

[0037] See also Figures 1 to 7As shown, the tops of the first recycling box 2, the second recycling box 4 and the third recycling box 5 are all fixedly connected to the heating box 20, the bottom of the heating box 20 is fixedly connected to a heat absorbing rod 21, the surface of the heat absorbing rod 21 is fixedly connected to multiple groups of heat absorbing tubes 22, and the surfaces of the heat absorbing rod 21 and the heat absorbing tubes 22 are both plugged into the inner wall of the heat absorbing column 16, the top of the heat absorbing rod 21 is fixedly connected to a threaded heat dissipation tube 23, and the surface of the threaded heat dissipation tube 23 is plugged into the inner wall of the heating box 20, the surface of the heating box 20 is fixedly connected to a protective box 24, the inner wall of the protective box 24 is fixedly connected to a driving motor 25, the output end of the driving motor 25 is equipped with a driving rod 26, the surface of the driving rod 26 is fixedly connected to multiple groups of stirring blades 27, and the surface of the stirring blades 27 is plugged into the inner wall of the heating box 20, the top of the heating box 20 is fixedly connected to a feeding pipe 28, the bottom of the heating box 20 is fixedly connected to a discharging pipe 29, and the inner wall of the discharging pipe 29 is rotatably connected to a valve 30.

[0038] During use, efficient heat transfer and utilization are achieved through the setting of the heating box 20. The bottom of the heating box 20 is connected to a heat-absorbing rod 21, and a plurality of heat-absorbing tubes 22 are distributed on the surface of the heat-absorbing rod 21. Both are inserted into the interior of the heat-absorbing column 16 to directly absorb the waste heat of the flue gas and the heat of the heat-absorbing column 16. The top of the heat-absorbing rod 21 is connected to a threaded heat dissipation tube 23. Its spiral structure increases the heat dissipation area and efficiently conducts heat to the interior of the heating box 20. A driving motor 25 is installed in the protective box 24, and the stirring blade 27 is driven to rotate by the driving rod 26 to heat the material in the heating box 20 evenly, avoiding local overheating or agglomeration. The material is added to the heating box 20 through the feed pipe 28 and discharged through the discharge pipe 29 after heating is completed. The valve 30 controls the discharge switch. The overall structure maximizes the recovery of waste heat from flue gas and uses it for material heating through the synergistic effect of heat absorption, heat transfer, and stirring, thereby improving energy utilization efficiency.

[0039] Example 3:

[0040] See also Figures 1 to 7 As shown, one side of the first recycling box 2, the second recycling box 4, the third recycling box 5 and the filter box 6 are all fixedly connected with a second temperature sensor 31, and the top of the back of the first recycling box 2, the second recycling box 4 and the third recycling box 5 are all fixedly connected with a plurality of connecting pipes 32, and the inner wall of the connecting pipe 32 is installed with a second solenoid valve 33, and the top of the connecting pipe 32 on the back of the first recycling box 2 is fixedly connected to the bottom of the second recycling box 4, the top of the connecting pipe 32 on the back of the second recycling box 4 is fixedly connected to the bottom of the third recycling box 5, and the top of the connecting pipe 32 on the back of the third recycling box 5 is fixedly connected to the bottom of the filter box 6, the inner wall of the filter box 6 is fixedly connected with a filter core, the top of the back of the filter box 6 is fixedly connected with a smoke exhaust pipe 34, the inner wall of the smoke exhaust pipe 34 is installed with a third solenoid valve 35, and the bottom of the mounting platform 1 is fixedly connected with multiple groups of support rods 36.

[0041] During use, the second temperature sensor 31 is used to monitor the flue gas temperature in the first recovery box 2, the second recovery box 4, the third recovery box 5 and the filter box 6 in real time, and the data is fed back to the control system. The connecting pipe 32 connects the recovery boxes at each level to form a flue gas flow channel. The second solenoid valve 33 intelligently adjusts the flue gas flow according to the temperature data: when the temperature of a recovery box at a certain level is too high, the flue gas input of the connecting pipe 32 at that level is reduced; when the temperature is low, the flow is increased to ensure balanced heat recovery. After the filter box 6 completes the final purification, the flue gas is discharged through the exhaust pipe 34. The third solenoid valve 35 controls the emission rate to avoid system pressure fluctuations. The support rod 36 provides stable support for the installation platform 1 to ensure the stability of the overall operation of the device, thereby realizing precise control of flue gas temperature, efficient multi-stage heat recovery and safe and stable operation of the system.

[0042] Example 4:

[0043] See also Figures 1 to 7 It is shown that in the chemical or food processing industries, high-temperature flue gas emitted by industrial boilers is usually discharged directly into the atmosphere, resulting in a large amount of heat energy waste. A chemical plant needs to deal with the 400-600℃ high-temperature flue gas generated by the boiler. At the same time, its production process requires continuous heating of chemical raw materials (such as liquid reactants) in the reactor. The traditional method uses electric heating or steam heating, which has high energy consumption and high cost. In order to improve energy utilization, the plant uses this multi-stage waste heat recovery device to directly use the waste heat of the flue gas for the waste heat of the raw materials, thereby achieving energy saving and consumption reduction.

[0044] High-temperature flue gas enters the device from the boiler through the flue gas inlet pipe 8, and the first temperature sensor 11 monitors the temperature in real time.

[0045] If the flue gas temperature is 500°C (moderate state), the first solenoid valve 10 controls the flue gas to be diverted and transported through the first connecting pipe 7 and the second connecting pipes 9 on both sides at the same time; if the temperature rises to 650°C (too high), one of the second connecting pipes 9 is closed and the flue gas is only transported through the first connecting pipe 7 and the single second connecting pipe 9 to avoid overheating and damage to the equipment.

[0046] The flue gas enters the first recovery box 2 through the connecting pipe 13, and the impact turbine 15 drives the heat absorbing column 16 to rotate, and the smoke hole 17 enhances heat exchange. The heat of the heat absorbing column 16 is transferred to the threaded heat dissipation pipe 23 in the heating box 20 through the heat absorbing rod 21 and the heat absorbing pipe 22, thereby heating the chemical raw materials.

[0047] The driving motor 25 heats the raw materials evenly through the stirring blades 27. The heated raw materials are transported to the reactor through the discharge pipe 29 (controlled by the valve 30). The residual heat temperature can reach 80-120°C, which significantly reduces the subsequent heating energy consumption.

[0048] The second temperature sensor 31 monitors the temperature of each level of the recovery box. If the temperature of the second recovery box 4 is too low, the second solenoid valve 33 increases the flue gas flow of the connecting pipe 32 to ensure balanced heat utilization.

[0049] Finally, the low-temperature flue gas is purified by the filter box 6 and safely discharged through the exhaust pipe 34 (regulated by the third solenoid valve 35), and the temperature drops to below 120° C., which meets environmental protection standards.

[0050] Working Principle: The device is based on a mounting platform, with a first recovery box fixedly connected to the top. A support frame sequentially supports the second, third, and filter boxes, forming a multi-stage waste heat recovery structure. During operation, high-temperature flue gas first enters the first recovery box through the flue gas inlet pipe. A first temperature sensor is installed in the flue gas inlet pipe to monitor the flue gas temperature in real time. If the flue gas temperature is moderate, the first solenoid valve controls the flue gas flow, diverting it simultaneously through the first connecting pipe and the second connecting pipes on both sides into the first recovery box. If the flue gas temperature is too high, the flue gas flow is adjusted by closing some of the second connecting pipes to prevent overheating and damage to the equipment.

[0051] The flue gas entering the first recovery box impacts the turbine, driving the turbine to rotate, and then driving the rotating rod and the heat-absorbing column to rotate. The heat-absorbing column is equipped with multiple sets of smoke holes, which enhance the heat exchange efficiency and effectively absorb the waste heat in the flue gas. The heat-absorbing column is connected to the insulation pipe through a bearing ring, which reduces heat loss. At the same time, the top of the first recovery box, the second recovery box and the third recovery box are all equipped with a heating box. The heat-absorbing rod and heat-absorbing tube connected to the bottom of the heating box are inserted into the heat-absorbing column to directly absorb the waste heat of the flue gas and the heat of the heat-absorbing column. The threaded heat dissipation pipe at the top of the heat-absorbing rod efficiently transfers the heat to the inside of the heating box, dissipating the waste heat of the material in the heating box.

[0052] To further enhance heat exchange efficiency, the heating box is equipped with a drive motor and stirring blades. The drive motor rotates the stirring blades via a drive rod, ensuring uniform heating of the material within the box, preventing local overheating and agglomeration. Material is introduced into the heating box through a feed pipe and discharged through a discharge pipe after heating is complete. A valve within the discharge pipe controls the opening and closing of the discharge.

[0053] In addition, a second temperature sensor is installed on one side of each level of recovery box to monitor the flue gas temperature in real time and feed the data back to the control system. The recovery boxes at each level are connected by a connecting pipe to form a flue gas flow channel. A solenoid valve is installed on the inner wall of the connecting pipe to intelligently adjust the flue gas flow according to the temperature data to ensure balanced heat recovery. Finally, the low-temperature flue gas after multi-stage waste heat recovery enters the filter box for purification and is then safely discharged through the exhaust pipe. The solenoid valve in the exhaust pipe controls the emission rate to avoid system pressure fluctuations. Through multi-stage recovery and precise temperature control, the entire device achieves efficient recovery and utilization of flue gas waste heat, significantly improving energy utilization efficiency.

[0054] While 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 these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A multi-stage waste heat recovery device, characterized in that: include: Mounting platform (1); The top of the installation platform (1) is fixedly connected to a first recovery box (2); the top of the installation platform (1) is located on one side of the first recovery box (2) and is fixedly connected to a plurality of support frames (3); the top of the support frames (3) is fixedly connected to a second recovery box (4), a third recovery box (5) and a filter box (6) in order from the lowest to the highest; A first connecting tube (7) is fixedly connected to the bottom of the surface of the first recovery box (2), one end of the first connecting tube (7) is fixedly connected to a smoke inlet pipe (8), and second connecting tubes (9) are fixedly connected to both sides of the connection between the first connecting tube (7) and the smoke inlet pipe (8), a first solenoid valve (10) is installed on the inner wall of the second connecting tube (9), and a first temperature sensor (11) is fixedly connected to the inner wall of the smoke inlet pipe (8); The inner wall of the first recovery box (2) is fixedly connected to a connecting disk (12); the front ends of the first connecting tube (7) and the second connecting tube (9) are respectively fixedly connected to connecting tubes (13), and the front ends of the connecting tubes (13) are fixedly connected to the surface of the connecting disk (12); the inner wall of the connecting disk (12) is rotatably connected to a rotating rod (14); the surface of the rotating rod (14) is fixedly connected to a turbine (15); the top end of the rotating rod (14) is fixedly connected to a heat absorbing column (16); and the inner wall of the heat absorbing column (16) is penetrated by a plurality of smoke holes (17).

2. The multi-stage waste heat recovery device according to claim 1, characterized in that: The top of the connecting plate (12) is fixedly connected to a heat preservation tube (18), the surface of the heat absorption column (16) is fixedly connected to a bearing ring (19), and the surface of the bearing ring (19) is fixedly connected to the inner wall of the heat preservation tube (18).

3. The multi-stage waste heat recovery device according to claim 1, characterized in that: The tops of the first recycling box (2), the second recycling box (4) and the third recycling box (5) are all fixedly connected to a heating box (20); the bottom of the heating box (20) is fixedly connected to a heat absorbing rod (21); the surface of the heat absorbing rod (21) is fixedly connected to a plurality of groups of heat absorbing tubes (22); and the surfaces of the heat absorbing rod (21) and the heat absorbing tubes (22) are both plugged into the inner wall of the heat absorbing column (16); the top of the heat absorbing rod (21) is fixedly connected to a threaded heat dissipation tube (23), and the surface of the threaded heat dissipation tube (23) is plugged into the inner wall of the heating box (20).

4. The multi-stage waste heat recovery device according to claim 3, characterized in that: The surface of the heating box (20) is fixedly connected to a protective box (24), the inner wall of the protective box (24) is fixedly connected to a driving motor (25), the output end of the driving motor (25) is installed with a driving rod (26), the surface of the driving rod (26) is fixedly connected to a plurality of stirring blades (27), and the surfaces of the stirring blades (27) are plugged into the inner wall of the heating box (20).

5. The multi-stage waste heat recovery device according to claim 3, characterized in that: The top of the heating box (20) is fixedly connected to a feed pipe (28), the bottom of the heating box (20) is fixedly connected to a discharge pipe (29), and the inner wall of the discharge pipe (29) is rotatably connected to a valve (30).

6. The multi-stage waste heat recovery device according to claim 1, characterized in that: One side of the first recovery box (2), the second recovery box (4), the third recovery box (5) and the filter box (6) is fixedly connected with a second temperature sensor (31); the top of the back of the first recovery box (2), the second recovery box (4) and the third recovery box (5) is fixedly connected with a plurality of connecting pipes (32); the inner wall of the connecting pipe (32) is installed with a second solenoid valve (33); the top of the connecting pipe (32) on the back of the first recovery box (2) is fixedly connected to the bottom of the second recovery box (4); the top of the connecting pipe (32) on the back of the second recovery box (4) is fixedly connected to the bottom of the third recovery box (5); and the top of the connecting pipe (32) on the back of the third recovery box (5) is fixedly connected to the bottom of the filter box (6).

7. The multi-stage waste heat recovery device according to claim 1, characterized in that: A filter core is fixedly connected to the inner wall of the filter box (6), a smoke exhaust pipe (34) is fixedly connected to the top of the back of the filter box (6), a third solenoid valve (35) is installed on the inner wall of the smoke exhaust pipe (34), and a plurality of support rods (36) are fixedly connected to the bottom of the mounting platform (1).

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