An aerobic fermentation waste heat recovery system

Abstract

This utility model relates to the field of organic solid waste treatment technology, and in particular to an aerobic fermentation waste heat recovery system. The aerobic fermentation waste heat recovery system includes a feeding device, a fermentation device, and a heat recovery power generation device. The heat recovery power generation device includes a heat collection unit and a thermoelectric generator unit. The heat collection unit is inserted into the chamber and directly contacts the material to collect the heat generated during fermentation and transfer it to the thermoelectric generator unit, which converts the heat into electrical energy. Because the heat collection unit can directly contact the material, it can directly and efficiently capture the heat generated by microbial fermentation inside the pile, reducing heat loss during the transfer process. The aerobic fermentation waste heat recovery system achieves heat collection and electrical energy conversion solely through the cooperation of the heat collection unit and the thermoelectric generator unit, eliminating the need for complex steam collection pipes, plate heat exchangers, and water-vapor separators, resulting in a simpler overall structure and reducing the difficulty and cost of system installation, disassembly, and daily maintenance.

Description

Technical Field

[0001] This utility model relates to the field of organic solid waste treatment technology, and in particular to an aerobic fermentation waste heat recovery system. Background Technology

[0002] With the development of agriculture and animal husbandry, a large amount of organic solid waste, such as livestock and poultry manure and crop straw, is generated. If these solid wastes are not effectively treated, they will not only cause environmental pollution but also waste the biomass energy they contain. Existing heat recovery methods mostly rely on phase change heat exchange systems such as steam collection and plate heat exchangers. Taking an aerobic fermentation system disclosed in Chinese utility model patent CN119754711A as an example, high-temperature steam generated in the chamber is collected through a gas collection pipe, and then undergoes phase change heat exchange with cold water through a plate heat exchanger to generate hot water for heating. At the same time, the gas after water-vapor separation is returned to the aeration system for reuse. Although some heat energy in the fermentation steam can be recovered, it cannot directly and efficiently capture the heat inside the pile, resulting in low recovery and conversion efficiency, and the system is complex and difficult to disassemble and maintain. Utility Model Content

[0003] (a) Technical problems to be solved

[0004] In view of the above-mentioned shortcomings and deficiencies of the prior art, this utility model provides an aerobic fermentation waste heat recovery system, which solves the technical problems of low heat recovery conversion rate and system complexity that makes disassembly and maintenance difficult.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0007] This utility model provides an aerobic fermentation waste heat recovery system, including a feeding device, a fermentation device, and a heat recovery power generation device. The feeding device is located on one side of the fermentation device, and its inlet is connected to the top of the fermentation device for conveying materials to the fermentation device. The fermentation device includes a box and an aeration unit located at the bottom of the box. The box has a space for accommodating materials, and the aeration unit is used to provide the materials in the box with the air required for fermentation. The heat recovery power generation device includes a heat collection unit and a thermoelectric generator unit. The heat collection unit extends laterally, and the thermoelectric generator unit is attached to the first end of the heat collection unit. The second end of the heat collection unit is inserted into the box and directly contacts the materials to collect the heat generated by fermentation and transfer it to the thermoelectric generator unit, which converts the heat into electrical energy.

[0008] Preferably, the heat collection unit includes a heat collection plate and multiple heat collection tubes; one end of the multiple heat collection tubes is connected to one side of the heat collection plate, and the other end of the heat collection tubes can be inserted laterally into the box and contact the material to transfer heat to the heat collection plate; the thermoelectric power generation unit is attached to the other side of the heat collection plate.

[0009] Preferably, the heat collection tube is a hollow tube; the heat collection plate and the heat collection tube are respectively a heat-conducting plate and a heat-conducting tube.

[0010] Preferably, the thermoelectric power generation unit includes a battery, a heat sink, and multiple thermoelectric generators connected in series; the thermoelectric generators are electrically connected to the battery; the hot end of the thermoelectric generator is connected to the heat collection plate, and the cold end of the thermoelectric generator is connected to the heat sink.

[0011] Preferably, multiple thermoelectric generators are arranged in a one-to-one correspondence with multiple heat collection tubes.

[0012] Preferably, it further includes a pushing device; the pushing device includes a pushing plate and a driving mechanism; the pushing plate is vertically oriented inside the box, the bottom end of the pushing plate is slidably connected to the box, and the two sides of the pushing plate are respectively connected to the opposite side walls of the box; the driving mechanism is located inside the box to drive the pushing plate to move along the length of the box to push the material to move.

[0013] Preferably, the drive mechanism includes two sets of drive components and a driven component; the two sets of drive components are respectively disposed on opposite side walls of the housing, and the driven component includes a drive shaft and two driven wheels sleeved on the drive shaft. The drive shaft is horizontally oriented and its two ends are rotatably connected to opposite side walls of the housing; each drive component includes a motor, a drive wheel, and a transmission chain. The first end of the transmission chain is sleeved on the drive wheel, and the tail ends of the transmission chains in the two sets of drive components are respectively sleeved on the two driven wheels; the output end of the motor is connected to the drive wheel to drive the drive wheel to rotate the transmission chain; the two sides of the upper part of the push plate are respectively connected to the lower chain of the transmission chain in the two sets of drive components; the two sides of the lower part of the push plate are respectively guided and engaged with the two side walls of the housing through guide rails.

[0014] Preferably, it further includes a material buffer device; the material buffer device is disposed inside the box and connected to the inner wall of the box; the buffer device includes a buffer cover and a screen disposed on the top of the buffer cover, the buffer cover is connected to the inner wall of the box through a connector, and the screen is opposite to the feed inlet of the feeding device; the surface of the buffer cover is a continuous and smooth inclined surface, and the width of the buffer cover gradually decreases from the near end to the far end.

[0015] Preferably, the side wall of the housing is provided with multiple through holes for inserting heat collection tubes, and the multiple through holes are arranged one-to-one with the multiple heat collection tubes; each through hole is provided with a baffle plate, which is hinged to the side wall of the housing to block the through hole; a sealing ring is provided inside the through hole.

[0016] Preferably, the aeration unit includes a blower and an air supply pipeline connected together; the diameter of the air supply pipeline gradually decreases from the inlet end to the outlet end; multiple air supply holes are opened on the air supply pipeline, and the multiple air supply holes of the air supply pipeline are set one-to-one with multiple openings on the bottom wall of the box.

[0017] (III) Beneficial Effects

[0018] The beneficial effects of this utility model are:

[0019] This utility model discloses an aerobic fermentation waste heat recovery system, comprising a feeding device, a fermentation device, and a heat recovery power generation device. The feeding device is used to transport materials to the fermentation device. The fermentation device includes a box and an aeration unit. The box has a space for containing materials, and the aeration unit provides the air required for fermentation. The heat recovery power generation device includes a heat collection unit and a thermoelectric generator unit. The heat collection unit extends laterally, and the thermoelectric generator unit is attached to the first end of the heat collection unit. The second end of the heat collection unit is inserted into the box to directly contact the materials to collect the heat generated by fermentation and transfer it to the thermoelectric generator unit, which converts the heat into electrical energy. Because the heat collection unit can directly contact the materials, it overcomes the limitation of existing technologies that rely solely on collecting high-temperature steam generated by fermentation for heat exchange. It can directly and efficiently capture the heat generated by microbial fermentation inside the pile, reducing heat loss during the transfer process and significantly improving the efficiency of waste heat recovery and energy conversion. This aerobic fermentation waste heat recovery system achieves heat collection and power conversion solely through the cooperation of a heat collection unit and a thermoelectric power generation unit. It eliminates the need for complex auxiliary equipment such as steam collection pipes, plate heat exchangers, and water-vapor separation, resulting in a simpler overall structure and reducing the difficulty and cost of system installation, disassembly, and daily maintenance. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the aerobic fermentation waste heat recovery system of this utility model;

[0021] Figure 2 The diagram shows the structure of the feeding device and the top of the box, but not the feeding device itself.

[0022] Figure 3 for Figure 2 A structural diagram from another perspective;

[0023] Figure 4 This is a schematic diagram of the bottom structure of the fermentation device;

[0024] Figure 5 for Figure 3 An enlarged schematic diagram of part A in the middle;

[0025] Figure 6 for Figure 2 Top view;

[0026] Figure 7 This is a schematic diagram of the structure of the solar collector plate and the thermoelectric generator.

[0027] Figure 8 A longitudinal sectional view showing the insertion of the heat collection tube into the opening of the housing.

[0028] [Explanation of Labels in the Attached Image]

[0029] 1: Feeding device; 2: Fermentation device; 21: Box body; 211: Through hole; 212: Opening; 213: Discharge door; 22: Aeration unit; 221: Blower; 222: Air supply pipeline; 3: Heat recovery and power generation device; 31: Heat collection unit; 311: Heat collection plate; 312: Heat collection tube; 32: Thermoelectric power generation unit; 321: Battery; 322: Heat sink; 323: Thermoelectric power generation plate; 4: Pushing device; 41: Pushing plate; 42: Drive mechanism; 421: Drive component; 4211: Motor; 4212: Transmission chain; 422: Passive component; 423: Guide rail; 5: Buffer device; 51: Buffer cover; 52: Screen; 6: Baffle plate; 7: Sealing ring. Detailed Implementation

[0030] To better explain and facilitate understanding of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] like Figure 1 As shown, this utility model embodiment provides an aerobic fermentation waste heat recovery system, which includes a feeding device 1, a fermentation device 2, and a heat recovery power generation device 3. The feeding device 1 is located on one side of the fermentation device 2, and its inlet is connected to the top of the fermentation device 2 for conveying materials to the fermentation device 2. The feeding device 1 is a screw conveyor.

[0032] like Figure 4 As shown, the fermentation device 2 includes a housing 21 and an aeration unit 22. The aeration unit 22 is located at the bottom of the housing 21. The housing 21 has a space for containing materials, and the aeration unit 22 is used to provide the materials in the housing 21 with the air required for fermentation. Figure 4As shown, in this embodiment, the housing 21 has a rectangular structure, and the aeration unit 22 is located at the bottom of the housing 21. The aeration unit 22 includes a blower 221 and an air supply pipe 222 connected to each other, providing sufficient air for the materials in the fermentation device 2. The diameter of the air supply pipe 222 gradually decreases from the inlet end to the outlet end, which increases the air velocity and pressure within the air supply pipe 222, facilitating more even delivery of air to the bottom of the housing 21. Multiple air supply holes are provided on the air supply pipe 222, through which air enters the material layer, ensuring sufficient oxygen supply during the material fermentation process and promoting efficient aerobic fermentation. The multiple air supply holes of the air supply pipe 222 are corresponding one-to-one with the multiple openings 212 on the bottom wall of the housing 21, ensuring precise and efficient air entry into the material area, avoiding air leakage and waste, optimizing the aeration effect, and improving the fermentation quality. In this embodiment, the gas supply pipe 222 is arranged in an S-shape at the bottom of the housing 21. The outer diameter of the inlet end of the gas supply pipe 222 is 75mm, the inner diameter is 65mm, the outer diameter of the outlet end is 50mm, the inner diameter is 40mm, and the wall thickness is constant at 5mm. This design enhances the Venturi effect, enabling the gas to maintain a high flow rate and stable kinetic energy throughout the pipe, effectively compensating for the flow rate reduction caused by friction resistance.

[0033] The heat recovery power generation device 3 includes a heat collection unit 31 and a thermoelectric power generation unit 32. The heat collection unit 31 extends laterally, and the thermoelectric power generation unit 32 is attached to the first end of the heat collection unit 31. The second end of the heat collection unit 31 is inserted into the housing 21 to directly contact the material, collecting the heat generated during fermentation and transferring it to the thermoelectric power generation unit 32, which then converts the heat into electrical energy. Because the heat collection unit 31 can directly contact the material, it overcomes the limitation of existing technologies that rely solely on collecting high-temperature steam generated during fermentation for heat exchange. It can directly and efficiently capture the heat generated by microbial fermentation inside the pile, reducing heat loss during transfer and significantly improving the efficiency of waste heat recovery and energy conversion. This aerobic fermentation waste heat recovery system achieves heat collection and electrical energy conversion solely through the cooperation of the heat collection unit 31 and the thermoelectric power generation unit 32. It eliminates the need for complex steam collection pipes, plate heat exchangers, and water-vapor separation equipment, resulting in a simpler overall structure and reducing the difficulty and cost of system installation, disassembly, and daily maintenance.

[0034] like Figure 2 and Figure 6As shown, the aerobic fermentation waste heat recovery system also includes a material buffer device 5, which is located inside the housing 21 and connected to the inner wall of the housing 21. The buffer device 5 includes a buffer cover 51 and a screen 52. The screen 52 is located at the top of the buffer cover 51, which is connected to the inner wall of the housing 21 via a connector. The screen 52 faces the inlet of the feeding device 1. The surface of the buffer cover 51 is a continuous, smooth, inclined surface, and the width of the buffer cover 51 gradually decreases from the near end to the far end. When material enters the housing 21 from the feeding device 1, part of the material enters the screen 52, and the other part slides down through the buffer cover 51, thus preventing material accumulation and ensuring that it falls as evenly as possible to the bottom of the housing 21.

[0035] like Figure 3 As shown, the heat collection unit 31 includes a heat collection plate 311 and multiple heat collection tubes 312. One end of each heat collection tube 312 is fixedly connected to one side of the heat collection plate 311 by screws, and the other end of each heat collection tube 312 can be inserted laterally into the housing 21 and contact the material to transfer heat to the heat collection plate 311. The thermoelectric power generation unit 32 is attached to the other side of the heat collection plate 311. The multiple heat collection tubes 312 can collect heat from different locations on the material and then converge it to the heat collection plate 311, ensuring efficient heat transfer, providing sufficient heat for the thermoelectric power generation unit 32, and improving power generation efficiency.

[0036] like Figure 8 As shown, the heat collection tube 312 is a hollow tube, and its internal cavity structure significantly increases the heat exchange area with the stack, thereby improving thermal conductivity. The heat collection plate 311 and the heat collection tube 312 are made of thermally conductive materials, such as copper and aluminum, which greatly improves heat conduction performance, reduces heat loss during transmission, and enables the heat collection unit 31 to transfer the heat from the material to the thermoelectric power generation unit 32 more quickly and efficiently, thus improving the thermal efficiency of the entire waste heat recovery system.

[0037] like Figure 3 and Figure 7 As shown, the thermoelectric power generation unit 32 includes a battery 321, a heat sink 322, and multiple thermoelectric generators 323 connected in series. The thermoelectric generators 323 are electrically connected to the battery 321. Each thermoelectric generator 323 has a hot end and a cold end positioned opposite each other. The hot end of the thermoelectric generator 323 is bonded to the heat collector plate 311, and the cold end is bonded to the heat sink 322. The voltage output terminal of the thermoelectric generator 323 outputs electrical energy to the battery 321. The heat sink 322 actively maintains the low temperature of the cold end of the thermoelectric generator 323, thus creating a large temperature difference with the hot end of the thermoelectric generator 323. The multiple thermoelectric generators 323 connected in series increase the voltage output, improve the power generation capacity, and meet the power needs of more devices.

[0038] The thermoelectric generator 323 has its hot end connected to the heat collector plate 311 and its cold end connected to the heat sink 322, creating a stable temperature difference between the two ends. Based on the Seebeck effect, this temperature difference causes charge carriers (such as electrons) in both materials to move directionally between the hot and cold ends, thereby generating electrical energy in the circuit and achieving a direct conversion from thermal energy to electrical energy. It is understood that the definitions of "cold" and "hot" mentioned above are relative. It should be noted that the specific power generation principle of the thermoelectric generator 323 is existing technology and will not be elaborated upon here.

[0039] In this embodiment, multiple thermoelectric generators 323 are arranged in a one-to-one correspondence with multiple heat collection tubes 312 to avoid heat waste and transmission interference, optimize heat distribution and conversion paths, and further improve the energy conversion efficiency of the waste heat recovery system.

[0040] like Figure 3 As shown, the side wall of the housing 21 is provided with multiple through holes 211 for inserting the heat collection tubes 312, and the multiple through holes 211 are arranged one-to-one with the multiple heat collection tubes 312. Figure 8 As shown, to prevent heat loss within the housing 21, each through-hole 211 is equipped with a baffle plate 6. The baffle plate 6 is hinged to the side wall of the housing 21 via a hinge shaft. To facilitate the repositioning of the baffle plate 6, a return spring is also provided on the hinge shaft. When the heat collection tube 312 is not inserted into the through-hole 211, the baffle plate 6 blocks the through-hole 211, thereby preventing heat loss within the housing 21. Simultaneously, to prevent heat loss when the heat collection tube 312 is inserted, a sealing ring 7 is provided inside the through-hole 211. It should be noted that the technical solution of the baffle plate 6 achieving repositioning via a return spring is within the scope of existing technology, and its specific structural principle and implementation method will not be elaborated here.

[0041] In this embodiment, the box 21 has hinged discharge doors 213 on both sides along its length, forming a sloping structure with material guiding function, ensuring an orderly and smooth discharge process, and effectively preventing material splashing. Figure 2 and 3 As shown, the aerobic fermentation waste heat recovery system also includes a pushing device 4, which includes a pushing plate 41 and a driving mechanism 42. The pushing plate 41 is vertically oriented inside the box 21, and the bottom end of the pushing plate 41 is slidably connected to the box 21. The two sides of the pushing plate 41 are respectively connected to the opposite side walls of the box 21. The driving mechanism 42 is located inside the box 21 to drive the pushing plate 41 to move along the length of the box 21 to push the material to move. It can effectively push the material to move along the length of the box 21, so as to realize the discharge and conveying of the material in the fermentation device 2 after the fermentation is completed.

[0042] like Figure 6As shown, the drive mechanism 42 includes two sets of drive components 421 and driven components 422. The two sets of drive components 421 are respectively disposed on opposite side walls of the housing 21. The driven component 422 includes a drive shaft and two driven wheels sleeved on the drive shaft. The drive shaft is horizontally oriented and its two ends are rotatably connected to opposite side walls of the housing 21. Figure 3 and Figure 6 As shown, each drive assembly 421 includes a motor 4211, a drive wheel (not shown), and a transmission chain 4212. The first end of the transmission chain 4212 is sleeved on the drive wheel, and the tail ends of the transmission chains 4212 in both drive assemblies 421 are respectively sleeved on the two driven wheels of the drive shaft. The output end of the motor 4211 is connected to the drive wheel to drive the drive wheel to rotate the transmission chain 4212. Figure 5 As shown, the upper two sides of the pusher plate 41 are connected to the lower chains of the transmission chains 4212 in the two sets of drive assemblies 421, and the lower two sides of the pusher plate 41 are guided and engaged with the side walls of the housing 21 via guide rails 423. The upper part of the pusher plate 41 is connected to the transmission chain, and the lower part of the pusher plate 41 is guided and engaged with the side walls of the housing 21 via guide rails 423 to ensure the stability and accuracy of the pusher plate 41 during movement.

[0043] The aerobic fermentation waste heat recovery system operates as follows: Driven by motor 4211, the pusher plate 41 is moved to one side of the chamber 21, providing space for subsequent feeding and fermentation. After mixing, the materials are transported to the chamber 21 through the feeding device 1. Some materials fall through the screen 52, while the rest slide down the inclined surface of the buffer cover 51, ensuring a relatively even distribution of materials within the chamber 21 and providing a buffer to prevent excessive impact on the bottom of the chamber 21. After feeding, the connection between the chamber 21 and the feeding device 1 is sealed, providing a closed environment for fermentation. The blower 221 automatically aerates the air according to the set ventilation intensity. Air is evenly delivered to the fermentation pile through the gradually narrowing air supply pipe 222 and the air supply holes, achieving efficient oxygen supply. During fermentation, the temperature of the pile is monitored in real time by temperature sensors deployed inside the chamber 21. When the temperature of the fermentation pile reaches the preset value, the heat collection pipe 312 of the heat recovery power generation device 3 is inserted into the box 21. The heat collection pipe 312 pushes open the baffle plate 6 and inserts into the pile, with its hot end directly contacting the high-temperature pile, conducting heat to the heat collection plate 311. The thermoelectric generator 323 fixed to the outside of the heat collection plate 311 converts heat energy into electrical energy based on the Seebeck effect, charging the battery 321 through a series circuit. When the pile temperature drops to the preset value, the heat recovery power generation device 3 is disassembled and removed from the side wall of the box 21. After fermentation, the discharge doors 213 on both sides of the box 21 tilt downwards and open, forming a slope structure with material guiding function with the ground. Subsequently, the motor 4211 drives the pusher plate 41 to move back and forth along the length of the box 21, pushing the fermentation products out of the box 21 from the discharge ports on both sides.

[0044] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0045] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0046] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0047] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0048] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An aerobic fermentation waste heat recovery system, characterized in that, It includes a feeding device (1), a fermentation device (2), and a heat recovery power generation device (3); The feeding device (1) is located on one side of the fermentation device (2), and the feed inlet of the feeding device (1) is connected to the top of the fermentation device (2) for feeding materials into the fermentation device (2). The fermentation device (2) includes a box (21) and an aeration unit (22) located at the bottom of the box (21). The box (21) has a space for accommodating materials, and the aeration unit (22) is used to provide the materials in the box (21) with the air required for fermentation. The heat recovery power generation device (3) includes a heat collection unit (31) and a thermoelectric power generation unit (32). The heat collection unit (31) extends laterally, and the thermoelectric power generation unit (32) is attached to the first end of the heat collection unit (31). The second end of the heat collection unit (31) is inserted into the box (21) and directly contacts the material to collect the heat generated by fermentation and transfer it to the thermoelectric power generation unit (32). The thermoelectric power generation unit (32) converts the heat into electrical energy.

2. The aerobic fermentation waste heat recovery system as described in claim 1, characterized in that: The heat collection unit (31) includes a heat collection plate (311) and multiple heat collection tubes (312); One end of each of the multiple heat collection tubes (312) is connected to one side of the heat collection plate (311), and the other end of the heat collection tubes (312) can be inserted laterally into the box (21) and come into contact with the material to transfer heat to the heat collection plate (311). The thermoelectric power generation unit (32) is attached to the other side of the heat collection plate (311).

3. The aerobic fermentation waste heat recovery system as described in claim 2, characterized in that: The heat collection tube (312) is a hollow tube; The heat collecting plate (311) and the heat collecting tube (312) are respectively a heat-conducting plate and a heat-conducting tube.

4. The aerobic fermentation waste heat recovery system as described in claim 2, characterized in that: The thermoelectric power generation unit (32) includes a battery (321), a heat sink (322), and multiple thermoelectric power generation elements (323) connected in series; The thermoelectric generator (323) is electrically connected to the storage battery (321); The hot end of the thermoelectric generator (323) is connected to the heat collection plate (311), and the cold end of the thermoelectric generator (323) is connected to the heat sink (322).

5. The aerobic fermentation waste heat recovery system as described in claim 4, characterized in that: Multiple thermoelectric generators (323) are arranged in a one-to-one correspondence with multiple heat collection tubes (312).

6. The aerobic fermentation waste heat recovery system as described in claim 1, characterized in that: It also includes a feeding device (4); The pushing device (4) includes a pushing plate (41) and a driving mechanism (42); The pusher plate (41) is vertically oriented inside the box (21), the bottom end of the pusher plate (41) is slidably connected to the box (21), and the two sides of the pusher plate (41) are respectively connected to the opposite side walls of the box (21). The drive mechanism (42) is disposed inside the housing (21) to drive the pusher plate (41) to move along the length direction of the housing (21) to push the material to move.

7. The aerobic fermentation waste heat recovery system as described in claim 6, characterized in that: The drive mechanism (42) includes two sets of drive components (421) and passive components (422); The two sets of drive components (421) are respectively disposed on the opposite side walls of the housing (21); the passive component (422) includes a drive shaft and two driven wheels sleeved on the drive shaft, the drive shaft is horizontally oriented and its two ends are respectively rotatably connected to the opposite side walls of the housing (21); Each drive assembly (421) includes a motor (4211), a drive wheel, and a transmission chain (4212). The first end of the transmission chain (4212) is sleeved on the drive wheel, and the tail ends of the transmission chains (4212) in the two sets of drive assemblies (421) are respectively sleeved on the two driven wheels. The output end of the motor (4211) is connected to the drive wheel to drive the drive wheel to rotate the transmission chain (4212); The upper sides of the pusher plate (41) are respectively connected to the lower chains of the transmission chains (4212) in the two sets of drive assemblies (421); The two sides of the lower part of the pusher plate (41) are guided and engaged with the two side walls of the box body (21) by guide rails (423).

8. The aerobic fermentation waste heat recovery system as described in claim 1, characterized in that: It also includes a material buffer device (5); The material buffer device (5) is disposed inside the box (21) and is connected to the inner wall of the box (21); The buffer device (5) includes a buffer cover (51) and a screen (52) disposed on the top of the buffer cover (51). The buffer cover (51) is connected to the inner wall of the box (21) by a connector. The screen (52) is opposite to the feed port of the feeding device (1). The surface of the buffer cover (51) is a continuous and smooth inclined surface, and the width of the buffer cover (51) gradually decreases from the near end to the far end.

9. The aerobic fermentation waste heat recovery system as described in claim 2, characterized in that: The side wall of the housing (21) is provided with a plurality of through holes (211) for inserting the heat collection tube (312), and the plurality of through holes (211) are provided one-to-one with the plurality of heat collection tubes (312); Each of the through holes (211) is provided with a corresponding shielding plate (6), and the shielding plate (6) is hinged to the side wall of the box (21) to shield the through hole (211); A sealing ring (7) is provided inside the through hole (211).

10. The aerobic fermentation waste heat recovery system as described in claim 1, characterized in that: The aeration unit (22) includes a blower (221) and an air supply pipeline (222) connected together; The diameter of the gas supply pipeline (222) gradually decreases from the inlet end to the outlet end; Multiple air supply holes are provided on the air supply pipeline (222), and the multiple air supply holes of the air supply pipeline (222) are provided in a one-to-one correspondence with the multiple openings (212) on the bottom wall of the box body (21).

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