A drying system waste heat recovery device

Abstract

This utility model relates to the field of waste heat recovery technology and discloses a waste heat recovery device for a drying system. The device includes a drying tower, a feed pipe fixedly connected to the top of the drying tower, an air inlet mechanism fixedly connected to the top of the drying tower, a bent pipe fixedly connected to the rear end of the air inlet mechanism, a purification mechanism fixedly connected to the bottom end of the bent pipe, a drive mechanism fixedly connected to the front side of the drying tower, and a reflux mechanism fixedly connected to the left end of the drying tower. The purification mechanism includes a filter cylinder, the top of which is fixedly connected to the bottom end of the bent pipe. A filter assembly is installed inside the filter cylinder, and a dehumidifier is installed at the bottom end of the filter assembly. In this utility model, through the coordinated operation of components such as the cyclone separator, filter assembly, and dehumidifier, impurities are removed, moisture is removed, and heat is recovered from the dried nitrogen, achieving nitrogen recycling, greatly reducing energy consumption, and improving energy utilization efficiency.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery technology, and in particular to a waste heat recovery device for a drying system. Background Technology

[0002] During operation, drying systems typically consume significant amounts of energy to heat air or other media to dry materials. In this process, the exhaust gases or cooling media often carry a substantial amount of heat, which is wasted if not utilized. The purpose of a waste heat recovery device in a drying system is to extract this wasted heat using specific technologies and equipment, and then reuse it in the drying system or other related processes, thereby saving energy, reducing costs, and minimizing environmental pollution.

[0003] When existing waste heat recovery devices in drying systems (such as heat exchangers and heat pumps) are in operation, the 50-150℃ humid waste gas generated during drying is first introduced into the heat exchanger by an induced draft fan, where it exchanges heat with the cold-side fluids such as fresh air, thus initially recovering heat. The unutilized waste heat is then further absorbed by the heat pump system, compressed and heated, and then reused.

[0004] In existing technologies, some waste heat recovery devices in drying systems only recover waste heat through a single heat exchanger during use, which cannot fully utilize the heat in the exhaust gas, resulting in a large amount of low-grade waste heat being wasted. Therefore, in order to address the above shortcomings, a waste heat recovery device for drying systems is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a waste heat recovery device for a drying system, which aims to improve the problem of low waste heat recovery efficiency in some existing waste heat recovery devices for drying systems during use.

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

[0007] A waste heat recovery device for a drying system includes a drying tower. A feed pipe is fixedly connected to the top of the drying tower, and an air inlet mechanism is fixedly connected to the top of the drying tower. A bent pipe is fixedly connected to the rear end of the air inlet mechanism, and a purification mechanism is fixedly connected to the bottom end of the bent pipe. A drive mechanism is fixedly connected to the front side of the drying tower, and a reflux mechanism is fixedly connected to the left end of the drying tower. The purification mechanism includes a filter cartridge, the top of which is fixedly connected to the bottom end of the bent pipe. A filter assembly is disposed inside the filter cartridge, and a dehumidification cartridge is disposed at the bottom end of the filter assembly. A support frame is fixedly connected inside the dehumidification cartridge, and multiple heat exchange modules are fixedly connected to the top side of the support frame. A heat exchange cartridge is fixedly connected to the rear end of the dehumidification cartridge via a U-shaped tube, and a connecting pipe is fixedly connected to the bottom end of the dehumidification cartridge. Multiple fins are fixedly connected inside the heat exchange cartridge.

[0008] The above scheme involves: a feed pipe at the top of the drying tower for material input; a top air intake mechanism that works with a bent pipe to transport gas; a purification mechanism that filters impurities from the gas; a heat exchange module on the support frame in the dehumidification cylinder that dehumidifies the gas and recovers heat; a U-shaped tube connecting the dehumidification cylinder to a finned heat exchange cylinder for further heat exchange; a bottom connecting pipe for media transfer; a reflux mechanism connected to the left end of the drying tower to achieve media reflux; and a drive mechanism that provides power for system operation. The entire device, through the coordinated action of its components, achieves purification, dehumidification, and waste heat recovery and reuse of the gas during the drying process, improving system energy efficiency and reducing heat loss.

[0009] Preferably, the air intake mechanism includes an air intake pipe, the left end of which is fixedly connected to the top of the drying tower, the right end of which is fixedly connected to a heater, the right end of which is fixedly connected to a straight pipe, the inside of which is fixedly connected to a side pipe, the rear end of which is fixedly connected to a fan, and the rear end of which is fixedly connected to the front end of the bent pipe.

[0010] The above scheme involves an air intake mechanism where the left end of the intake pipe is connected to the top of the drying tower to introduce gas, and the right end is connected to a heater to heat the gas. The heated gas is then transported through a straight pipe, and the side pipes inside the straight pipe can assist in gas diversion or mixing. A fan at the rear provides power to push the gas through the straight pipe to the bent pipe, thereby realizing the function of conveying heated gas into the drying tower. This provides the required hot airflow for the drying process of materials in the drying tower, ensuring the temperature and airflow power requirements of the drying operation.

[0011] Preferably, the driving mechanism includes a protective cylinder, the front side of which is fixedly connected to the front side of the drying tower, a motor is fixedly connected inside the protective cylinder, a rotating shaft is fixedly connected to the driving end of the motor, a fixed cylinder is fixedly connected to the front end of the rotating shaft, multiple blades are fixedly connected to the outside of the fixed cylinder, and two rubber wheels are fixedly connected to the rear end of the rotating shaft.

[0012] The above scheme involves a protective cylinder fixed to the front of the drying tower. An internal motor drives a rotating shaft, causing the fixed cylinder and external blades at the front of the shaft to rotate, thus achieving functions such as stirring the material or propelling airflow within the drying tower. Two rubber wheels at the rear of the shaft may assist in maintaining the stability of the mechanism through friction transmission or positioning. The entire drive mechanism, through the coordinated operation of its components, provides power support and functional operation for the drying tower.

[0013] Preferably, the reflux mechanism includes a first cyclone separator, the right end of which is fixedly connected to the left end of the drying tower via a pipe, and a second cyclone separator is fixedly connected to the left end of the first cyclone separator via a pipe. Both the first and second cyclone separators are fixedly connected to a drain pipe at their bottom ends, and a heating pipe is fixedly connected inside the two drain pipes. A right-angle pipe is fixedly connected to the left end of the second cyclone separator, and a second fan is fixedly connected to the rear end of the right-angle pipe. A connecting pipe is fixedly connected to the rear end of the second fan.

[0014] The above scheme involves cyclone separator one connected to the left end of the drying tower via a pipeline, which performs preliminary separation of the gas-solid mixture discharged from the drying tower. Cyclone separator two is connected in series with cyclone separator one to further separate the remaining solid particles and gas, improving the separation effect. The drain pipes at the bottom of both separators, in conjunction with heating pipes, prevent the separated material from clogging the pipes due to condensation or other reasons, ensuring smooth material discharge. The right-angle pipe at the left end of cyclone separator two connects to fan two, which provides power to transport the separated gas to other parts of the system through connecting pipes, realizing gas recycling and effectively improving the system's resource utilization and operating efficiency.

[0015] Preferably, the right end of the connecting tube is fixedly connected to the left end of the filter cylinder, and the rear end of the heating tube is fixedly connected to the bottom end of the connecting tube.

[0016] The above method involves heating the gas or material flowing through the connecting pipe using a heating tube, so that the heated medium has a suitable temperature when it enters the filter cartridge.

[0017] Preferably, the filter assembly includes a filter plate, the filter plate is fixedly connected to the outside of the filter cylinder, two bottom plates are fixedly connected to the bottom side of the filter plate, a collection frame is slidably connected to the rear end of the filter cylinder, and a lower air pipe is fixedly connected to the bottom end of the filter cylinder.

[0018] The above solution involves installing a filter plate inside the filter cartridge to intercept solid impurities in the gas, achieving gas-solid separation. Two base plates on the bottom support and stabilize the filter plate, while the collection frame at the rear of the filter cartridge can slide to facilitate the collection of impurities intercepted by the filter plate, making cleaning easier.

[0019] Preferably, the bottom end of the lower air pipe is fixedly connected to the top end of the dehumidification cylinder, and the rear end of the rotating shaft is rotatably connected to the inside of the filter cylinder.

[0020] The above solution involves a fixed connection between the bottom of the lower air pipe and the top of the dehumidifier cylinder, forming a gas channel that allows the treated gas in the dehumidifier cylinder to be transported to subsequent stages. The filter cylinder also restricts the rotation of the shaft.

[0021] Preferably, the outer side of the rubber wheel is in contact with the bottom side of the base plate, and a recovery pipe is fixedly connected to the bottom end of the heat exchange cylinder.

[0022] The above method involves the rubber wheel contacting the bottom side of the base plate, thereby striking the base plate and transferring nitrogen gas to the recovery pipe through the heat exchange cylinder.

[0023] This utility model has the following beneficial effects:

[0024] 1. In this utility model, through the coordinated work of components such as cyclone separator, filter assembly, and dehumidifier, impurities are removed, moisture is removed, and heat is recovered from the dried nitrogen, thereby realizing the recycling of nitrogen, greatly reducing energy consumption, and improving energy utilization.

[0025] 2. In this utility model, the blades accelerate heat exchange and the rubber wheel automatically cleans the filter plate, which not only improves the drying efficiency but also reduces the cost of manual maintenance, ensuring the long-term stable and efficient operation of the device, and has good economic benefits and practical value. Attached Figure Description

[0026] Figure 1 This is a perspective view of a waste heat recovery device for a drying system proposed in this utility model;

[0027] Figure 2 This is a schematic diagram of the structure of the heat exchange cylinder of a waste heat recovery device for a drying system proposed in this utility model;

[0028] Figure 3 This is a schematic diagram of the structure of the fixed cylinder of the waste heat recovery device for a drying system proposed in this utility model;

[0029] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0030] Figure 5 This is a schematic diagram of the connecting pipe of a waste heat recovery device for a drying system proposed in this utility model.

[0031] Legend:

[0032] 1. Drying tower; 2. Feed pipe; 3. Air inlet mechanism; 31. Air inlet pipe; 32. Heater; 33. Straight pipe; 34. Side pipe; 35. Fan 1; 4. Bending pipe; 5. Purification mechanism; 51. Filter cartridge; 52. Filter assembly; 5201. Filter plate; 5202. Base plate; 5203. Collection frame; 5204. Lower air pipe; 53. Dehumidifier cartridge; 54. Support frame; 55. Heat exchange module; 5 6. Connecting pipe; 57. U-shaped pipe; 58. Heat exchanger cylinder; 59. Fins; 6. Drive mechanism; 61. Protective cylinder; 62. Motor; 63. Rotating shaft; 64. Fixed cylinder; 65. Blades; 66. Rubber wheel; 7. Recirculation mechanism; 71. Cyclone separator one; 72. Cyclone separator two; 73. Drain pipe; 74. Heating pipe; 75. Fan two; 76. Right-angle pipe; 77. Connecting pipe; 8. Recovery pipe. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1 -Appendix Figure 5 This application will be described in further detail below.

[0034] Example: Refer to Figures 2 to 4 This utility model provides an embodiment of a waste heat recovery device for a drying system, including a drying tower 1 for drying materials in the entire system. A feed pipe 2 is fixedly connected to the top of the drying tower 1, through which materials are introduced into the interior of the drying tower 1. An air intake mechanism 3 is fixedly connected to the top of the drying tower 1, and a bent pipe 4 is fixedly connected to the rear end of the air intake mechanism 3. The air intake mechanism 3 includes an air intake pipe 31, the left end of which is fixedly connected to the top of the drying tower 1 by welding, thus providing support for the air intake pipe 31. Simultaneously, the air intake pipe 31 is used to introduce nitrogen gas into the interior of the drying tower 1. A heater 32 is fixedly connected to the right end of 1, which heats the nitrogen gas. A straight tube 33 is fixedly connected to the right end of the heater 32, which heats the nitrogen gas inside the straight tube 33 and introduces it into the interior of the inlet pipe 31. A side pipe 34 is fixedly connected to the interior of the straight tube 33, which introduces the nitrogen gas into the interior of the straight tube 33. A blower 35 is fixedly connected to the rear end of the straight tube 33, which drives the nitrogen gas to blow into the interior of the straight tube 33. The rear end of the blower 35 is fixedly connected to the front end of the bent pipe 4, which introduces the returning nitrogen gas into the interior of the straight tube 33.

[0035] Specifically, the drying tower 1 is used for material drying in the entire system. The feed pipe 2, which is fixedly connected to its top, can introduce the material into the tower. The air intake mechanism 3 at the top of the drying tower 1 introduces nitrogen into the drying tower 1 through the air intake pipe 31. The left end of the air intake pipe 31 is welded and fixed to the top of the drying tower 1, and the heater 32 connected to the right end can heat the nitrogen. The heated nitrogen enters the air intake pipe 31 through the straight pipe 33. The side pipe 34 inside the straight pipe 33 is used to introduce nitrogen. The fan 35 at its rear end can drive the nitrogen to blow into the straight pipe 33. The bent pipe 4 connected to the rear end of the fan 35 can introduce the returning nitrogen into the straight pipe 33. Through the synergistic effect of each component, the waste heat of nitrogen in the drying process can be recovered and reused, thereby achieving energy saving and improving drying efficiency.

[0036] A purification mechanism 5 is fixedly connected to the bottom end of the bent tube 4. The purification mechanism 5 includes a filter cylinder 51, the top end of which is fixedly connected to the bottom end of the bent tube 4 by welding. This filter cylinder 51 is used to filter the dried nitrogen. A filter assembly 52 is installed inside the filter cylinder 51. The filter assembly 52 includes a filter plate 5201, which is used to filter the dried nitrogen. The filter plate 5201 is fixedly connected to the inside of the filter cylinder 51 by welding, thus serving as the filter plate 5201. 01 provides support. Two base plates 5202 are fixedly connected to the bottom side of the filter plate 5201 by welding, thereby providing support for the base plates 5202. A collection frame 5203 is slidably connected to the rear end of the filter cylinder 51. The collection frame 5203 is used to collect the filter residue after filtration. A lower air pipe 5204 is fixedly connected to the bottom end of the filter cylinder 51. The nitrogen gas filtered inside the filter cylinder 51 is led out through the lower air pipe 5204. A dehumidification cylinder 53 is provided at the bottom end of the filter assembly 52. ​​The dehumidification cylinder 53 is used to dehumidify the nitrogen gas.

[0037] Specifically, the purification mechanism 5 is fixedly connected to the bottom end of the bent tube 4. The top of the filter cylinder 51 is welded to the bottom end of the bent tube 4. The filter component 52 inside plays a key role. The filter plate 5201 is welded and fixed inside the filter cylinder 51, which can filter the dried nitrogen. The two bottom plates 5202 welded to its bottom side provide support. The collection frame 5203 slidably connected at the rear end can collect the filtered filter residue. The lower gas pipe 5204 at the bottom end of the filter cylinder 51 can lead out the filtered nitrogen. In addition, the dehumidification cylinder 53 set at the bottom end of the filter component 52 can also dehumidify the nitrogen. Through the cooperation of various components, the purification mechanism 5 realizes the filtration, filter residue collection and dehumidification of the dried nitrogen, ensuring the cleanliness and dryness of the returned nitrogen, and providing high-quality gas for waste heat recovery and utilization.

[0038] The bottom end of the lower air pipe 5204 is fixedly connected to the top end of the dehumidification cylinder 53. Nitrogen gas is introduced into the interior of the dehumidification cylinder 53 through the lower air pipe 5204. A support frame 54 is fixedly connected inside the dehumidification cylinder 53 by welding, thus providing support for the support frame 54. Multiple heat exchange modules 55 are fixedly connected to the top side of the support frame 54. The heat exchange modules 55 are used to heat the nitrogen gas, causing it to condense into water droplets that fall into the interior of the dehumidification cylinder 53. The rear end of the dehumidification cylinder 53 is fixedly connected to the top end of the dehumidification cylinder 53 by a U-shaped tube 57. A heat exchange cylinder 58 is connected, and nitrogen gas dehumidified inside the dehumidification cylinder 53 is introduced into the interior of the heat exchange cylinder 58 through a U-shaped tube 57. A connecting pipe 56 is fixedly connected to the bottom end of the dehumidification cylinder 53, and the connecting pipe 56 leads out the water inside the dehumidification cylinder 53. A recovery pipe 8 is fixedly connected to the bottom end of the heat exchange cylinder 58, and nitrogen gas is introduced through the recovery pipe 8 for heating according to different needs. Multiple fins 59 are fixedly connected inside the heat exchange cylinder 58 for heat dissipation. This is existing technology, so it will not be described in detail.

[0039] Specifically, the lower air pipe 5204 introduces filtered nitrogen into the dehumidification cylinder 53. The support frame 54 welded and fixed inside the dehumidification cylinder 53 supports multiple heat exchange modules 55. These heat exchange modules 55 heat the nitrogen, causing the moisture in it to condense and fall into the cylinder. The water in the cylinder is discharged through the connecting pipe 56. The dehumidified nitrogen enters the heat exchange cylinder 58 through the U-shaped pipe 57. The fins 59 inside the heat exchange cylinder 58 assist in heat dissipation. Finally, the nitrogen is led out by the recovery pipe 8 to meet different heating needs. This series of components work together to achieve deep dehumidification, heat exchange and recycling of nitrogen, effectively improving the utilization efficiency of nitrogen and the waste heat recovery effect.

[0040] Reference Figure 1 , Figure 2 and Figure 5A drive mechanism 6 is fixedly connected to the front side of the drying tower 1. The drive mechanism 6 includes a protective cylinder 61, which provides protection. The front side of the protective cylinder 61 is fixedly connected to the front side of the drying tower 1 and is fixed by welding, thereby providing support for the protective cylinder 61. A motor 62 is fixedly connected inside the protective cylinder 61, which provides the drive source. A rotating shaft 63 is fixedly connected to the drive end of the motor 62. The rotating shaft 63 is driven to rotate by starting the motor 62. The rear end of the rotating shaft 63 is rotatably connected to the inside of the filter cylinder 51, through which the rotating shaft 63 is powered. The rotation of shaft 63 provides support. A fixed cylinder 64 is fixedly connected to the front end of shaft 63. The rotational force is transmitted to the fixed cylinder 64 through shaft 63. Multiple blades 65 are fixedly connected to the outside of fixed cylinder 64. The fixed cylinder 64 drives the multiple blades 65 to rotate, which can accelerate the heating efficiency of nitrogen and raw materials. Two rubber wheels 66 are fixedly connected to the rear end of shaft 63. The rotational force is transmitted to the two rubber wheels 66 through shaft 63. The outside of rubber wheels 66 contacts the bottom side of base plate 5202. The base plate 5202 is struck through the gaps between rubber wheels 66.

[0041] Specifically, in the drive mechanism 6 at the front of the drying tower 1, the protective cylinder 61 is welded and fixed to the front of the drying tower 1, which protects the internal motor 62. The motor 62 serves as the drive source, and after starting, it drives the rotating shaft 63 to rotate. The rear end of the rotating shaft 63 rotates inside the filter cylinder 51. The fixed cylinder 64 connected to the front end can transmit the rotational force to multiple external blades 65. The rotation of the blades 65 accelerates the heating efficiency of nitrogen and raw materials in the drying tower 1. At the same time, when the two rubber wheels 66 at the rear end of the rotating shaft 63 rotate, they strike the bottom plate 5202 through the gap, which can effectively prevent the filter plate 5201 from being affected by the accumulation of filter residue. The drive mechanism 6, through the cooperation of various components, ensures the smooth filtration of the purification mechanism 5 while ensuring the drying efficiency.

[0042] A reflux mechanism 7 is fixedly connected to the left end of the drying tower 1. The reflux mechanism 7 is used for nitrogen recovery and utilization. The reflux mechanism 7 includes a cyclone separator 71, which provides blowing force. The right end of the cyclone separator 71 is fixedly connected to the left end of the drying tower 1 through a pipe. The nitrogen inside the drying tower 1 is drawn out through the cyclone separator 71. A cyclone separator 72 is fixedly connected to the left end of the cyclone separator 71 through a pipe. The cyclone separators 71 and 72 are used to remove smaller particles of impurities and some moisture, improving the purity of the gas. A drain pipe 73 is fixedly connected to the bottom of both the cyclone separators 71 and 72. The drain pipe 73 is used to drain the nitrogen inside the cyclone separators 71 and 72. The water is drawn out from the bottom of the filter cylinder 51. A heating pipe 74 is fixedly connected inside the two drain pipes 73 to heat the nitrogen. A right-angle pipe 76 is fixedly connected to the left end of the cyclone separator 72 to draw out the nitrogen from inside the cyclone separator 72. A blower 75 is fixedly connected to the rear end of the right-angle pipe 76 to provide the force for drawing nitrogen. A connecting pipe 77 is fixedly connected to the rear end of the blower 75 to transfer nitrogen to the connecting pipe 77. The right end of the connecting pipe 77 is fixedly connected to the left end of the filter cylinder 51 to transfer nitrogen to the filter cylinder 51. The rear end of the heating pipe 74 is fixedly connected to the bottom end of the connecting pipe 77 and fixed by welding to facilitate the transfer of nitrogen.

[0043] Specifically, the reflux mechanism 7 at the left end of the drying tower 1 is used for nitrogen recovery and utilization. Cyclone separator 1 71 is connected to the left end of the drying tower 1 via a pipe, allowing nitrogen to be drawn out of the tower. Cyclone separator 2 72, connected to its left end, works together to remove smaller particulate impurities and some moisture from the nitrogen, improving gas purity. The drain pipes 73 at the bottom of cyclone separator 1 71 and cyclone separator 2 72 are used for drainage. The internal heating pipe 74 heats the nitrogen. The right-angle pipe 76 at the left end of cyclone separator 2 72 draws out nitrogen. The fan 2 75 connected to the rear end provides suction, transferring the nitrogen through the connecting pipe 77 to the filter cartridge 51. The heating pipe 74 welded inside the bottom of the connecting pipe 77 also facilitates nitrogen transfer. All components of the reflux mechanism 7 operate collaboratively, achieving the separation, purification, heating, and recovery of nitrogen discharged from the drying tower 1, improving nitrogen recycling efficiency.

[0044] Working principle: The material enters the drying tower 1 through the feed pipe 2, while nitrogen is injected through the air inlet pipe 31. After being heated by the heater 32, the material enters the drying tower 1 through the straight pipe 33 and the bent pipe 4 under the drive of the blower 35 to dry the material. The dried nitrogen, carrying residual heat and impurities, enters the interior of the cyclone separator 1 71 and the cyclone separator 2 72. First, the cyclone separator 1 71 separates large particles of impurities, and then the cyclone separator 2 72 performs fine separation. Wastewater is discharged through the drain pipe 73, with the heating pipe 74 inside to prevent freezing. The separated nitrogen enters the filter cylinder 51 through the right-angle pipe 76, the blower 2 75, and the connecting pipe 77. In the filter cylinder 51, it is filtered by the filter plate 5201, and the filter residue falls into the collection frame 52. 03. After filtration, the nitrogen enters the dehumidification cylinder 53 through the lower air pipe 5204. Inside the dehumidification cylinder 53, the heat exchange module 55 cools the nitrogen, causing the water vapor to condense. The moisture is discharged through the connecting pipe 56. The dehumidified nitrogen enters the heat exchange cylinder 58 through the U-shaped pipe 57, where the heat is further recovered through the fins 59. Finally, it is output for reuse through the recovery pipe 8. The nitrogen will re-enter the fan 35 through the bent pipe 4 for reuse. During operation, the starter motor 62 drives the rotating shaft 63 to rotate, which in turn drives the fixed cylinder 64 to rotate, and then drives the blades 65 to rotate. The blades 65 accelerate the heat exchange inside the tower. The rubber wheel 66 periodically taps the bottom plate 5202 to clean the filter plate 5201, ensuring the efficient operation of the device.

[0045] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A waste heat recovery device for a drying system, comprising a drying tower (1), characterized in that: The top of the drying tower (1) is fixedly connected to a feed pipe (2), the top of the drying tower (1) is fixedly connected to an air intake mechanism (3), the rear end of the air intake mechanism (3) is fixedly connected to a bending pipe (4), the bottom end of the bending pipe (4) is fixedly connected to a purification mechanism (5), the front side of the drying tower (1) is fixedly connected to a drive mechanism (6), and the left end of the drying tower (1) is fixedly connected to a reflux mechanism (7). The purification mechanism (5) includes a filter cylinder (51), the top end of which is fixedly connected to the bottom end of the bent tube (4). A filter assembly (52) is provided inside the filter cylinder (51), and a dehumidification cylinder (53) is provided at the bottom end of the filter assembly (52). A support frame (54) is fixedly connected inside the dehumidification cylinder (53), and multiple heat exchange modules (55) are fixedly connected to the top side of the support frame (54). A heat exchange cylinder (58) is fixedly connected to the rear end of the dehumidification cylinder (53) through a U-shaped tube (57). A connecting pipe (56) is fixedly connected to the bottom end of the dehumidification cylinder (53), and multiple fins (59) are fixedly connected inside the heat exchange cylinder (58).

2. The waste heat recovery device for a drying system according to claim 1, characterized in that: The air intake mechanism (3) includes an air intake pipe (31), the left end of which is fixedly connected to the top of the drying tower (1), the right end of which is fixedly connected to a heater (32), the right end of which is fixedly connected to a straight pipe (33), the inside of which is fixedly connected to a side pipe (34), the rear end of which is fixedly connected to a fan (35), and the rear end of which is fixedly connected to the front end of the bent pipe (4).

3. The waste heat recovery device for a drying system according to claim 2, characterized in that: The drive mechanism (6) includes a protective cylinder (61), the front side of which is fixedly connected to the front side of the drying tower (1). A motor (62) is fixedly connected inside the protective cylinder (61), and a rotating shaft (63) is fixedly connected to the drive end of the motor (62). A fixed cylinder (64) is fixedly connected to the front end of the rotating shaft (63), and multiple blades (65) are fixedly connected to the outside of the fixed cylinder (64). Two rubber wheels (66) are fixedly connected to the rear end of the rotating shaft (63).

4. The waste heat recovery device for a drying system according to claim 1, characterized in that: The reflux mechanism (7) includes a cyclone separator one (71), the right end of which is fixedly connected to the left end of the drying tower (1) via a pipe, and a cyclone separator two (72) is fixedly connected to the left end of which via a pipe. Both the bottom ends of the cyclone separator one (71) and the cyclone separator two (72) are fixedly connected to a drain pipe (73), and a heating pipe (74) is fixedly connected inside the two drain pipes (73). A right-angle pipe (76) is fixedly connected to the left end of the cyclone separator two (72), and a fan two (75) is fixedly connected to the rear end of the right-angle pipe (76). A connecting pipe (77) is fixedly connected to the rear end of the fan two (75).

5. A waste heat recovery device for a drying system according to claim 4, characterized in that: The right end of the connecting tube (77) is fixedly connected to the left end of the filter cylinder (51), and the rear end of the heating tube (74) is fixedly connected to the bottom end of the connecting tube (77).

6. A waste heat recovery device for a drying system according to claim 3, characterized in that: The filter assembly (52) includes a filter plate (5201), the filter plate (5201) is fixedly connected to the outside of the filter cylinder (51), two bottom plates (5202) are fixedly connected to the bottom side of the filter plate (5201), a collection frame (5203) is slidably connected to the rear end of the filter cylinder (51), and a lower air pipe (5204) is fixedly connected to the bottom end of the filter cylinder (51).

7. A waste heat recovery device for a drying system according to claim 6, characterized in that: The bottom end of the lower air pipe (5204) is fixedly connected to the top end of the dehumidifier cylinder (53), and the rear end of the rotating shaft (63) is rotatably connected to the inside of the filter cylinder (51).

8. A waste heat recovery device for a drying system according to claim 6, characterized in that: The outside of the rubber wheel (66) is in contact with the bottom side of the base plate (5202), and the bottom end of the heat exchange cylinder (58) is fixedly connected to the recovery pipe (8).

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