Aluminum electrolysis waste heat recovery device

Abstract

The application provides an aluminum electrolysis waste heat recovery device, and relates to the field of waste heat recovery, and aims to solve the problem of environmental pollution caused by heat loss in air through smoke during electrolysis of aluminum. The recovery device comprises: a smoke recovery assembly installed at one end of a smoke outlet of an electrolytic cell; a heat exchange box, a side wall of the heat exchange box being provided with a smoke inlet and an exhaust port, the smoke inlet being connected with the other end of the smoke recovery assembly; a rotating shaft installed in the heat exchange box, an inner cavity being arranged in the rotating shaft; a plurality of heat radiating fins, one end of each heat radiating fin being connected with the rotating shaft, a heat exchange chamber being arranged on each heat radiating fin, and a heat exchange channel being formed between adjacent two heat radiating fins; a medium conveying assembly installed at one end of the rotating shaft and communicated with the inner cavity; a medium return assembly installed at the other end of the rotating shaft and communicated with the heat exchange chamber; and a driving assembly connected with the rotating shaft. The application collects and processes the smoke generated during electrolysis of aluminum, so that the heat in the smoke is effectively utilized, and the pollution of heat to the environment is reduced.

Description

Technical Field

[0001] This invention relates to the field of waste heat recovery technology, and in particular to a waste heat recovery device for aluminum electrolysis. Background Technology

[0002] The electrolytic aluminum industry is an important basic industry in my country, but it is also a high-energy-consuming industry. With increasingly tight energy demand and stricter environmental protection measures, the energy consumption of electrolytic aluminum directly determines the development of enterprises. Therefore, improving the energy utilization rate and reducing energy consumption in the electrolytic aluminum industry is an inevitable trend.

[0003] Electrolytic aluminum cells primarily consume electrical energy. They use carbon-based anodes and molten aluminum as cathodes. When a strong direct current is applied, an electrochemical reaction occurs within the cell at 950℃-970℃ to produce molten aluminum. 50% of the energy input into the electrolytic cell is dissipated into the surrounding environment as heat, resulting not only in energy waste but also in thermal pollution. Summary of the Invention

[0004] To address the environmental pollution caused by heat loss through flue gas during aluminum electrolysis, this invention provides an aluminum electrolysis waste heat recovery device that collects and treats the flue gas generated during aluminum electrolysis, thereby effectively utilizing the heat in the flue gas and reducing heat pollution to the environment.

[0005] The technical solution adopted in this invention is:

[0006] An aluminum electrolysis waste heat recovery device includes:

[0007] The flue gas recovery assembly has its inlet end installed at the flue gas outlet of the electrolytic cell;

[0008] A heat exchange box, wherein a flue gas inlet and an exhaust port are provided on the side wall of the heat exchange box, and the flue gas inlet is connected to the exhaust end of the flue gas recovery assembly;

[0009] A rotating shaft is installed inside the heat exchange box, and the interior of the rotating shaft is provided with a cavity for containing the medium;

[0010] Multiple heat sinks with an arc-shaped cross-section are provided. One end of each heat sink is connected to the rotating shaft. Each heat sink has a heat exchange chamber that communicates with the cavity. When the heat sink is installed, the concave surface of the heat sink is positioned away from the exhaust port, and a heat exchange channel is formed between two adjacent heat sinks.

[0011] A media delivery assembly is installed at one end of the rotating shaft, and the outlet end of the media delivery pipe is connected to the cavity;

[0012] A medium reflux assembly is installed at the other end of the rotating shaft, and the inlet end of the medium reflux assembly is connected to the heat exchange chamber;

[0013] A drive assembly is connected to the rotating shaft, and the drive assembly drives the rotating shaft to rotate.

[0014] The flue gas outlet of the flue gas recovery component is oriented toward the concave surface of the heat sink.

[0015] Optionally, the flue gas recovery assembly includes:

[0016] A smoke hood is installed at the flue gas outlet of the electrolytic cell;

[0017] The smoke supply pipe is connected at one end to the smoke collection hood and at the other end to the flue gas inlet;

[0018] An induced draft fan is installed on the flue gas duct, with its outlet facing the flue gas inlet.

[0019] Optionally, an auxiliary cooling channel is provided in the side wall of the heat exchange box. The inlet of the auxiliary cooling channel is located at the flue gas outlet, and the outlet of the auxiliary cooling channel is located at the flue gas inlet. The outlet of the auxiliary cooling channel is connected to the medium return assembly.

[0020] Optionally, the media recirculation assembly includes:

[0021] A medium delivery pipe, one end of which is rotatably connected to the cavity;

[0022] A media storage tank, with the other end of the media delivery pipe connected to the media storage tank;

[0023] A fastener is installed on the side wall of the heat exchange box, and the fastener is fixedly connected to the medium conveying pipe.

[0024] Optionally, the media recirculation assembly includes:

[0025] Medium return pipe, each of the heat sinks is provided with a medium return pipe, one end of the medium return pipe is connected to the heat exchange chamber;

[0026] The rotating disk is circular in shape, with its central part used for the rotating shaft to pass through, and the other end of the medium return pipe is connected to the rotating disk.

[0027] A collection component is connected to the heat exchange box. The middle part of the collection component is provided with a clearance hole for the rotating shaft to pass through. The top of the collection component is provided with a collection groove for the collection medium. The rotating disk is rotatably installed at the opening of the collection groove.

[0028] The medium discharge pipe is connected at one end to the collection tank and at the other end to an external mechanism.

[0029] Optionally, the driving component includes:

[0030] The transmission mechanism has one end connected to the rotating shaft;

[0031] A speed reduction mechanism, wherein the other end of the transmission mechanism is connected to the speed reduction mechanism;

[0032] A drive motor is connected to the reduction mechanism and is used to drive the reduction mechanism to move the transmission mechanism, which in turn drives the rotating shaft to rotate.

[0033] Optionally, the rotational speed of the rotating shaft is 10-20 revolutions per minute.

[0034] Optionally, the aluminum electrolysis preheating and recovery device includes:

[0035] An insulation layer is provided on the outside of the heat exchange box.

[0036] Optionally, the outer wall of the heat sink is provided with several irregular grooves.

[0037] Optionally, the heat sink and the rotating shaft are integrally formed.

[0038] Compared with the prior art, the beneficial effects of the present invention are:

[0039] 1. Flue gas enters the heat exchange box through the side wall and comes into contact with the heat sinks installed inside the heat exchange box. The medium enters the heat sink through the rotating shaft and comes into contact with the heated flue gas to complete the heat exchange. After the heat exchange is completed, the flue gas is discharged through the exhaust port. The flue gas comes into contact with multiple heat sinks and can stay in the heat exchange box for a certain period of time, so that the heat in the flue gas is fully absorbed and heat loss is avoided.

[0040] 2. By setting the orientation of the flue gas inlet, the pressure of the flue gas entering the heat exchange box drives the heat sink mounted on the rotating shaft to rotate, thereby reducing the energy consumption of the drive mechanism. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a schematic diagram of the overall structure of an aluminum electrolysis waste heat recovery device.

[0043] Figure 2 for Figure 1 A magnified schematic diagram of the structure at point A in the middle.

[0044] Figure 3 This is a three-dimensional structural diagram of an aluminum electrolysis waste heat recovery device.

[0045] Figure 4 This is a schematic diagram of the full cross-section structure of an aluminum electrolysis waste heat recovery device.

[0046] Figure 5 This is a magnified schematic diagram of the surface structure of the heat sink in an aluminum electrolysis waste heat recovery device.

[0047] Figure label:

[0048] 1. Flue gas recovery assembly; 11. Smoke hood; 12. Smoke delivery duct; 13. Exhaust fan;

[0049] 2. Heat exchange box; 21. Flue gas inlet; 22. Exhaust port; 23. Auxiliary cooling channel;

[0050] 3. Rotating shaft; 31. Cavity;

[0051] 4. Heat sink; 41. Heat exchange chamber; 42. Heat exchange channel; 43. Groove;

[0052] 5. Media conveying assembly; 51. Media conveying pipe; 52. Media storage tank; 53. Fixtures;

[0053] 6. Medium reflux assembly; 61. Medium reflux pipe; 62. Rotary disc; 63. Collector; 64. Clearance hole; 65. Collection trough; 66. Medium discharge pipe;

[0054] 7. Drive assembly; 71. Transmission mechanism; 72. Reduction mechanism; 73. Drive motor;

[0055] 8. Insulation layer. Detailed Implementation

[0056] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0057] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0058] Furthermore, 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0059] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," 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, an electrical connection, or a communication 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. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0060] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being 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 "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0061] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0062] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0063] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this embodiment of the invention provides an aluminum electrolysis waste heat recovery device, including: a flue gas recovery component 1, a heat exchange box 2, a rotating shaft 3, multiple heat sinks 4, a medium conveying component 5, a medium return component 6, and a drive component 7;

[0064] The inlet of the flue gas recovery assembly 1 is installed at the flue gas outlet of the electrolytic cell, facilitating the centralized collection and treatment of the flue gas generated during electrolysis. A flue gas inlet 21 and an exhaust port 22 are provided on the side wall of the heat exchange box 2, with the flue gas inlet 21 connected to the exhaust end of the flue gas recovery assembly 1. The flue gas entering the flue gas recovery assembly 1 is discharged into the heat exchange box 2, where heat exchange is completed. A rotating shaft 3 is installed inside the heat exchange box 2, and the interior of the rotating shaft 3 has a cavity 31 for accommodating the medium. The heat sink 4 has an arc-shaped cross-section, with one end connected to the rotating shaft 3. The heat sink 4 has a heat exchange chamber 41 communicating with the cavity 31. When the heat sink 4 is installed, its concave surface faces away from the exhaust port 22, forming a heat exchange channel 42 between adjacent heat sinks 4. A medium conveying assembly 5 is installed at one end of the rotating shaft 3, and the outlet end of the medium conveying pipe 51 communicates with the cavity 31. A medium reflux assembly 6 is installed at the other end of the rotating shaft 3, and the inlet end of the medium reflux assembly 6 is connected to the heat exchange chamber 41. A drive assembly 7 is connected to the rotating shaft 3, and the drive assembly 7 drives the rotating shaft 3 to rotate. The flue gas outlet of the flue gas recovery assembly 1 is oriented towards the concave surface of the heat sink 4.

[0065] During heat exchange, the flue gas recovery assembly 1 concentrates the flue gas generated by electrolysis in the electrolytic cell, and then enters the heat exchange box 2 through the flue gas inlet 21. Once inside the heat exchange box 2, the flue gas comes into contact with the heat sink 4, transferring heat to the heat sink 4 during this contact process. The medium enters the heat exchange chamber 41 of the heat sink 4 through the cavity 31 of the rotating shaft 3, absorbing the heat transferred to the heat sink 4. After absorbing heat, the medium is discharged from the heat sink 4 through the medium return assembly 6, facilitating the entry of new medium into the heat exchange chamber 41 for heat exchange. During heat exchange, the rotating shaft 3 is driven to rotate slowly by the drive assembly 7, facilitating the entry of flue gas into different heat exchange channels 42.

[0066] The heat sink 4 is designed with an arc shape, and the concave surface of the heat sink 4 is positioned away from the exhaust port 22 to facilitate the rotation of the rotating shaft 3 by the flue gas entering the heat exchange box 2, thereby reducing the energy consumption of the drive mechanism. At the same time, designing the heat sink 4 with an arc shape increases the area of ​​the heat sink 4, allowing the flue gas to exchange heat with the medium in the heat sink 4 during the rotation of the rotating shaft 3.

[0067] It should be noted that the heat sink 4 in this embodiment is made of aluminum, copper or silver.

[0068] In another embodiment, such as Figure 1 As shown, the flue gas recovery assembly 1 includes a fume hood 11, a flue gas supply duct 12, and an induced draft fan 13. The fume hood 11 is installed at the flue gas outlet of the electrolytic cell. One end of the flue gas supply duct 12 is connected to the fume hood 11, and the other end is connected to the flue gas inlet 21. The induced draft fan 13 is installed on the flue gas supply duct 12, and its outlet is oriented towards the flue gas inlet 21.

[0069] The flue gas generated during the electrolysis process is introduced into the flue gas supply duct 12 by the induced draft fan 13, and then transported to the heat exchange box 2 through the flue gas supply duct 12, where the flue gas completes heat exchange. A fume hood 11 is installed at one end of the inlet of the flue gas supply duct 12 to facilitate the centralized collection of the flue gas discharged from the electrolysis cell, and to prevent excessive flue gas from overflowing and causing changes in the temperature environment within the plant area.

[0070] In another embodiment, such as Figure 3 As shown, the heat exchange box 2 is provided with an auxiliary cooling channel 23 in the side wall. The inlet of the auxiliary cooling channel 23 is located at the flue gas outlet, and the outlet of the auxiliary cooling channel 23 is located at the flue gas inlet 21. The outlet of the auxiliary cooling channel 23 is connected to the medium return assembly 6.

[0071] An auxiliary cooling channel 23 is provided on the inner side wall of the heat exchange box 2 to improve the cooling efficiency of the flue gas. The medium passing through the auxiliary cooling channel 23 enters the medium return assembly 6 for collection and treatment. To avoid insufficient heat exchange time for the medium in the auxiliary cooling channel 23, the inlet of the auxiliary cooling channel 23 is located at the flue gas outlet. The auxiliary cooling channel 23 is a serpentine bend, increasing the residence time of the medium in the auxiliary cooling pipe. At the same time, since the flue gas at the flue gas outlet has a certain residual temperature, it is absorbed by the medium in the auxiliary cooling channel 23. Then, the medium flows in the auxiliary cooling channel 23, absorbing the temperature of the flue gas in other directions, and then is discharged into the medium return assembly 6.

[0072] In another embodiment, such as Figure 1 As shown, the media reflux assembly 6 includes: a media delivery pipe 51, a media storage tank 52, and a fixing member 53. One end of the media delivery pipe 51 is rotatably connected to the cavity 31. The other end of the media delivery pipe 51 communicates with the media storage tank 52. The fixing member 53 is installed on the side wall of the heat exchange box 2, and the fixing member 53 is fixedly connected to the media delivery pipe 51.

[0073] During heat exchange, the pump in the medium storage tank 52 supplies medium to the medium delivery pipe 51. The medium enters the cavity 31 of the rotating shaft 3 through the medium delivery pipe 51, and then enters the corresponding heat sink 4 through the cavity 31 of the rotating shaft 3. The medium exchanges heat with the heat sink 4. The fixing member 53 is installed on the heat exchange box 2 and is fixedly connected to the medium delivery pipe 51 to prevent the medium delivery pipe 51 from being driven to rotate during the rotation of the rotating shaft 3.

[0074] In another embodiment, such as Figure 1 , Figure 2 and Figure 4 As shown, the medium return assembly 6 includes: a medium return pipe 61, a rotating disk 62, a collector 63, and a medium discharge pipe 66. Each heat sink 4 is provided with a medium return pipe 61, one end of which is connected to the heat exchange chamber 41. The rotating disk 62 is annular, with its central portion for the rotating shaft 3 to pass through, and the other end of the medium return pipe 61 connected to the rotating disk. The collector 63 is connected to the heat exchange box 2, with a clearance hole 64 in its central portion for the rotating shaft 3 to pass through, and a collection groove 65 at its top for collecting the medium. The rotating disk 62 is rotatably mounted at the opening of the collection groove 65. One end of the medium discharge pipe 66 is connected to the collection groove 65, and the other end is connected to an external mechanism.

[0075] After heat exchange, the medium enters the collecting tank 65 through the medium return assembly 6, and then is discharged through the medium discharge pipe 66 connected to the collecting tank 65. When the rotating shaft 3 drives the heat sink 4 to rotate, the medium return pipe 61 connected to the heat sink 4 is driven to rotate. The rotating disk 62 at the other end of the medium return pipe 61 rotates with the rotating shaft 3 in the collecting tank 65 of the collecting component 63. The medium flows into the collecting tank 65 and is then transported to the external mechanism through the medium discharge pipe 66.

[0076] In another embodiment, such as Figure 1 and Figure 2 As shown, the drive assembly 7 includes a transmission mechanism 71, a reduction mechanism 72, and a drive motor 73. One end of the transmission mechanism 71 is connected to the rotating shaft 3; the other end of the transmission mechanism 71 is connected to the reduction mechanism 72; the drive motor 73 is connected to the reduction mechanism 72 and is used to drive the reduction mechanism 72 to move the transmission mechanism 71, and the transmission mechanism 71 drives the rotating shaft 3 to rotate. The rotation mechanism and the reduction mechanism 72 are provided to reduce the rotational speed of the drive motor 73, so that the flue gas stays in the heat exchange box 2 for a sufficient time, allowing the heat in the flue gas to be completely absorbed.

[0077] In this embodiment, the transmission mechanism 7 can be a gear transmission mechanism or a belt transmission mechanism. The reduction mechanism is an existing reduction gearbox.

[0078] In another embodiment, in order to facilitate complete heat exchange of flue gas in the heat exchange box 2, the rotation speed of the rotating shaft 3 is 10-20 revolutions per minute.

[0079] In another embodiment, such as Figure 4 As shown, in order to further reduce heat loss, an insulation layer 8 is wrapped around the outside of the heat exchange box 2. The insulation layer 8 is made of insulation cotton and aerogel felt.

[0080] In another embodiment, such as Figure 5 As shown, several grooves 43 are machined on the outer wall of the heat sink 4 by shot peening. These grooves 43 are used to increase the contact area between the flue gas and the heat sink 4, and the heat sink 4 treated by shot peening has higher structural strength and corrosion resistance.

[0081] In another embodiment, to further improve the structural strength of the recycling device, the heat sink 4 and the rotating shaft 3 are integrally formed.

[0082] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A waste heat recovery device for aluminum electrolysis, characterized in that, include: The flue gas recovery assembly has its inlet end installed at the flue gas outlet of the electrolytic cell; A heat exchange box, wherein a flue gas inlet and an exhaust port are provided on the side wall of the heat exchange box, and the flue gas inlet is connected to the exhaust end of the flue gas recovery component; A rotating shaft is installed inside the heat exchange box, and the interior of the rotating shaft is provided with a cavity for containing the medium; Multiple heat sinks with an arc-shaped cross-section are provided. One end of each heat sink is connected to the rotating shaft. Each heat sink has a heat exchange chamber that communicates with the cavity. When the heat sink is installed, the concave surface of the heat sink is positioned away from the exhaust port. A heat exchange channel is formed between two adjacent heat sinks. Several grooves are machined on the outer wall of the heat sink. A media conveying assembly is installed at one end of the rotating shaft, and the outlet end of the media conveying assembly is connected to the cavity; A medium reflux assembly is installed at the other end of the rotating shaft, and the inlet end of the medium reflux assembly is connected to the heat exchange chamber; A drive assembly is connected to the rotating shaft, and the drive assembly drives the rotating shaft to rotate. The flue gas outlet of the flue gas recovery assembly is oriented toward the concave surface of the heat sink. The heat exchange box has an auxiliary cooling channel inside its side wall. The inlet of the auxiliary cooling channel is located at the exhaust port, and the outlet of the auxiliary cooling channel is located at the flue gas inlet. The outlet of the auxiliary cooling channel is connected to the medium reflux assembly.

2. The aluminum electrolysis waste heat recovery device according to claim 1, characterized in that, The flue gas recovery assembly includes: A smoke hood is installed at the flue gas outlet of the electrolytic cell; The smoke supply pipe is connected at one end to the smoke collection hood and at the other end to the flue gas inlet; An induced draft fan is installed on the flue gas duct, with its outlet facing the flue gas inlet.

3. The aluminum electrolysis waste heat recovery device according to claim 1, characterized in that, The medium delivery assembly includes: A medium delivery pipe, one end of which is rotatably connected to the cavity; A media storage tank, with the other end of the media delivery pipe connected to the media storage tank; A fastener is installed on the side wall of the heat exchange box, and the fastener is fixedly connected to the medium conveying pipe.

4. The aluminum electrolysis waste heat recovery device according to claim 1, characterized in that, The medium recirculation assembly includes: Medium return pipe, each of the heat sinks is provided with a medium return pipe, one end of the medium return pipe is connected to the heat exchange chamber; The rotating disk is circular in shape, with its central part used for the rotating shaft to pass through, and the other end of the medium return pipe is connected to the rotating disk. A collection component is connected to the heat exchange box. The middle part of the collection component is provided with a clearance hole for the rotating shaft to pass through. The top of the collection component is provided with a collection groove for the collection medium. The rotating disk is rotatably installed at the opening of the collection groove. The medium discharge pipe is connected at one end to the collection tank and at the other end to an external mechanism.

5. The aluminum electrolysis waste heat recovery device according to claim 1, characterized in that, The driving component includes: The transmission mechanism has one end connected to the rotating shaft; A speed reduction mechanism, wherein the other end of the transmission mechanism is connected to the speed reduction mechanism; A drive motor is connected to the reduction mechanism and is used to drive the reduction mechanism to move the transmission mechanism, which in turn drives the rotating shaft to rotate.

6. The aluminum electrolysis waste heat recovery device according to claim 5, characterized in that, The rotational speed of the rotating shaft is 10-20 revolutions per minute.

7. The aluminum electrolysis waste heat recovery device according to claim 1, characterized in that, The aluminum electrolysis waste heat recovery device includes: An insulation layer is provided on the outside of the heat exchange box.

8. The aluminum electrolysis waste heat recovery device according to claim 1, characterized in that, The outer wall of the heat sink has several irregularly arranged grooves.

9. The aluminum electrolysis waste heat recovery device according to claim 1, characterized in that, The heat sink and the rotating shaft are integrally formed.

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