CN116576681A - An aluminum electrolysis waste heat recovery device - Google Patents

Abstract

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

Description

An aluminum electrolysis waste heat recovery device

technical field

The invention relates to the technical field of waste heat recovery, in particular to an aluminum electrolysis waste heat recovery device.

Background technique

The electrolytic aluminum industry is an important basic industry in my country, but it is also a high energy-consuming industry. Under the general trend of increasingly tense energy demand and stricter environmental protection, the energy consumption of electrolytic aluminum directly determines the development of enterprises. Therefore, it is the general trend to improve the energy utilization rate of the electrolytic aluminum industry and reduce energy consumption.

The electrolytic aluminum tank mainly consumes electric energy. It uses the carbon body as the anode and the aluminum liquid as the cathode. After passing through a strong direct current, an electrochemical reaction is carried out in the electrolytic cell at 950°C-970°C to produce aluminum liquid. 50% of the energy input into the electrolyzer is lost to the surrounding environment in the form of heat, which not only wastes energy, but also causes thermal pollution to the environment.

Contents of the invention

The present invention aims to solve the problem of environmental pollution caused by heat loss in the air through the flue gas during electrolysis of aluminum. Aiming at the above problems, the present invention provides an aluminum electrolysis waste heat recovery device, which collects and processes the flue gas generated during electrolysis of aluminum, so that The heat in the flue gas is effectively used to reduce the pollution of the heat to the environment.

The technical scheme adopted in the present invention is:

An aluminum electrolysis waste heat recovery device, comprising:

A flue gas recovery component, the air inlet of which is installed at the flue gas outlet of the electrolyzer;

A heat exchange box, the side wall of the heat exchange box is provided with a flue gas inlet and an exhaust port, and the flue gas inlet is connected to the smoke outlet of the flue gas recovery component;

The rotating shaft is installed in the heat exchange box, and the inside of the rotating shaft is provided with a cavity for accommodating the medium;

A plurality of cooling fins, the cross-section of which is arc-shaped, one end of the cooling fins is connected to the rotating shaft, and a heat exchange chamber communicating with the cavity is provided on the cooling fins. When the cooling fins are installed Finally, the concave surface of the heat sink is set away from the exhaust port, and a heat exchange channel is formed between two adjacent heat sinks;

A medium conveying assembly is installed at one end of the rotating shaft, and the outlet end of the medium conveying pipe communicates with the cavity;

A medium return component is installed on the other end of the rotating shaft, and the inlet end of the medium return component communicates with the heat exchange chamber;

a driving assembly connected to the rotating shaft, and the driving assembly drives the rotating shaft to rotate;

Wherein, the direction of the smoke outlet of the smoke recovery assembly is set towards the concave surface of the heat sink.

Optionally, the flue gas recovery component includes:

The fume collecting hood is installed at the flue gas outlet of the electrolyzer;

A smoke delivery pipe, one end is connected to the smoke collecting hood, and the other end is connected to the smoke inlet;

The induced draft fan is installed on the smoke supply pipe, and its air outlet is set towards the smoke inlet.

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 smoke outlet, and the outlet of the auxiliary cooling channel is located at the smoke inlet, so The outlet of the auxiliary cooling passage communicates with the medium return assembly.

Optionally, the medium return assembly includes:

A medium conveying pipe, one end of which is rotatably connected to the cavity;

a medium storage box, the other end of the medium delivery pipe communicates with the medium storage box;

A fixing piece is installed on the side wall of the heat exchange box, and the fixing piece is fixedly connected with the medium delivery pipe.

Optionally, the medium return assembly includes:

A medium return pipe, each of the cooling fins is provided with the medium return pipe, and one end of the medium return pipe communicates with the heat exchange chamber;

The rotating disk is in the shape of a ring, the middle part of which is used for the passage of the rotating shaft, and the other end of the medium return pipe is connected to the rotating disk;

A collection part is connected with the heat exchange box, the middle part of the collection part is provided with a relief hole for the rotation shaft to pass through, and the top of the collection part is provided with a collection groove for the confluence medium. Rotate and install at the notch of the collection tank;

One end of the medium discharge pipe is connected to the collection tank, and the other end is connected to the external mechanism.

Optionally, the drive assembly includes:

A transmission mechanism, one end of which is connected to the rotating shaft;

A deceleration mechanism, the other end of the transmission mechanism is connected to the deceleration mechanism;

The driving motor is connected with the reduction mechanism, and is used to drive the reduction mechanism to drive the transmission mechanism to move, and the transmission mechanism drives the rotation shaft to rotate.

Optionally, the rotating speed of the rotating shaft is 10-20 revolutions per minute.

Optionally, the aluminum electrolysis preheat recovery device includes:

Insulation layer, the insulation layer is wrapped and arranged on the outside of the heat exchange box.

Optionally, several grooves are randomly provided on the outer wall of the heat sink.

Optionally, the cooling fin and the rotating shaft are integrally formed.

Compared with prior art, the beneficial effect of the present invention is:

1. The flue gas enters the heat exchange box through the side wall of the heat exchange box and contacts the heat sink installed in the heat exchange box. The medium enters the heat sink through the rotating shaft to contact the flue gas with temperature to complete the heat exchange After the heat exchange is completed, the flue gas can be discharged through the exhaust port; the flue gas is in 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 to avoid cause heat loss.

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 installed on the rotating shaft to rotate, reducing the energy consumption of the driving mechanism.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present application. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

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

FIG. 2 is a schematic diagram of a partially enlarged structure at point A in FIG. 1 .

Fig. 3 is a three-dimensional structural schematic diagram of an aluminum electrolysis waste heat recovery device.

Fig. 4 is a schematic diagram of a full cross-sectional structure of an aluminum electrolysis waste heat recovery device.

Fig. 5 is a schematic diagram of the enlarged surface structure of the heat sink of the aluminum electrolysis waste heat recovery device.

Reference signs:

1. Smoke recovery components; 11. Smoke collection hood; 12. Smoke delivery pipe; 13. Induced fan;

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

3. Rotating shaft; 31. Cavity;

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

5. Medium conveying components; 51. Medium conveying pipe; 52. Medium storage box; 53. Fixing parts;

6. Medium return pipe; 61. Medium return pipe; 62. Rotating disc; 63. Collection piece; 64. Relief hole; 65. Collection tank; 66. Medium discharge pipe;

7. Drive components; 71. Transmission mechanism; 72. Speed reduction mechanism; 73. Drive motor;

8. Insulation layer.

Detailed ways

In the following, only some exemplary embodiments are briefly described. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and descriptions are to be regarded as illustrative in nature and not restrictive.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial" The orientation or positional relationship indicated by , "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that is usually placed when the product of the present invention is used, or the technical Orientation or positional relationship commonly understood by people is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a reference to the present invention. Invention Limitations.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection or an indirect connection through an intermediary, it can be the internal communication of two components or the interaction relationship between two components . Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "under" a second feature may include direct contact between the first and second features, and may also include the first and second features Not in direct contact but through another characteristic contact between them. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. "Below", "below" and "under" the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the level of the first feature is smaller than that of the second feature.

The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, components and arrangements of specific examples are described below. Of course, they are only examples and are not intended to limit the invention. Furthermore, the present disclosure may repeat reference numerals and/or reference letters in different instances, such repetition is for simplicity and clarity and does not in itself indicate a relationship between the various embodiments and/or arrangements discussed. In addition, various specific process and material examples are provided herein, but one of ordinary skill in the art may recognize the use of other processes and/or the use of other materials.

Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1, Figure 2, Figure 3 and Figure 4, the embodiment of the present 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, and a plurality of cooling fins 4. Medium delivery component 5, medium return component and drive component 7;

The inlet end of the flue gas recovery component 1 is installed at the flue gas outlet of the electrolyzer, so as to facilitate centralized collection and treatment of the flue gas produced by the electrolysis of the electrolyzer. A flue gas inlet 21 and an exhaust port 22 are provided on the side wall of the heat exchange box 2 , and the flue gas inlet 21 is connected to the flue gas outlet 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, and the heat exchange is completed in the heat exchange box 2. The rotating shaft 3 is installed in the heat exchange box 2, and a cavity 31 for accommodating a medium is provided inside the rotating shaft 3. The cross-section of the cooling fin 4 is arc-shaped, one end of the cooling fin 4 is connected to the rotating shaft 3, and the cooling fin 4 is provided with a heat exchange chamber 41 communicating with the cavity 31. After the heat sink 4 is installed, the concave surface of the heat sink 4 is set away from the exhaust port 22 , and a heat exchange channel 42 is formed between two adjacent heat sinks 4 . The medium delivery assembly 5 is mounted on one end of the rotating shaft 3 , and the outlet end of the medium delivery pipe 51 communicates with the cavity 31 . The medium return assembly is installed on the other end of the rotating shaft 3 , and the inlet end of the medium return assembly communicates with the heat exchange chamber 41 . The driving assembly 7 is connected with the rotating shaft 3 , and the driving assembly 7 drives the rotating shaft 3 to rotate. Wherein, the direction of the gas outlet of the gas recovery assembly 1 is set towards the concave surface of the cooling fin 4 .

During heat exchange, the flue gas recovery component 1 concentrates the flue gas generated by the electrolysis of the electrolytic cell, and then enters the heat exchange box 2 through the flue gas inlet 21 of the heat exchange box 2, and the flue gas enters the heat exchange box 2 and then dissipates heat The fins 4 are in contact, and heat is transferred to the heat sink 4 during the contact process. The medium enters the heat exchange chamber 41 of the heat sink 4 through the cavity 31 of the rotating shaft 3, and then absorbs the heat transferred to the heat sink 4. After the medium absorbs the heat, it is discharged from the heat sink 4 through the medium return assembly, which is convenient for new medium into the heat exchange chamber 41 for heat exchange. During heat exchange, the rotating shaft 3 is driven by the driving assembly 7 to rotate slowly, so that the flue gas enters different heat exchange channels 42 conveniently.

The heat sink 4 is arranged in an arc-shaped structure, and the concave surface of the heat sink 4 is set away from the exhaust port 22 to facilitate the smoke entering the heat exchange box 2 to drive the rotating shaft 3 to rotate and reduce the energy consumption of the driving mechanism. At the same time, setting the cooling fins 4 in an arc-shaped structure can increase the area of the cooling fins 4 , so that the flue gas can complete heat exchange with the medium in the cooling fins 4 during the rotation process of the rotating shaft 3 .

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

In another embodiment, as shown in FIG. 1 , the flue gas recovery assembly 1 includes: a fume collecting hood 11 , a fume supply pipe 12 and an induced draft fan 13 , and the fume collecting hood 11 is installed at the flue gas outlet of the electrolyzer. One end of the smoke delivery pipe 12 is connected to the smoke collecting hood 11 , and the other end is connected to the smoke inlet 21 . The induced draft fan 13 is installed on the smoke supply pipe 12 , and its air outlet is set towards the smoke inlet 21 .

The flue gas produced by the electrolytic cell during the electrolysis process is introduced into the smoke delivery pipe 12 through the induced draft fan 13, and is transported to the heat exchange box 2 through the smoke delivery duct 12, where the flue gas completes heat exchange. The fume collecting hood 11 is arranged at the inlet end of the smoke delivery pipe 12 to facilitate the centralized collection of the flue gas discharged from the electrolytic cell, so as to avoid excessive flue gas from overflowing and causing changes in the temperature environment in the factory area.

In another embodiment, as shown in FIG. 3 , an auxiliary cooling channel 23 is provided in the side wall of the heat exchange box 2, and the inlet of the auxiliary cooling channel 23 is located at the smoke exhaust port. The outlet of the channel 23 is located at the flue gas inlet 21 , and the outlet of the auxiliary cooling channel 23 communicates with the medium return assembly.

The auxiliary cooling channel 23 is provided inside the 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 in the side wall of the heat exchange box 2 enters the medium return assembly for collection and treatment. In order to avoid insufficient heat exchange time of the medium in the auxiliary cooling channel 23, the entrance of the auxiliary cooling channel 23 is set at the smoke outlet, and the auxiliary cooling channel 23 is a serpentine bend to increase the residence time of the medium in the auxiliary cooling channel. At the same time, due to the residual temperature of the flue gas at the exhaust port, it is absorbed by the medium in the auxiliary cooling channel 23, and then the medium flows in the auxiliary cooling channel 23 to absorb the temperature of the flue gas in other directions, and then discharged into the medium return pipe 6 Inside.

In another embodiment, as shown in FIG. 1 , the medium return assembly includes: a medium delivery pipe 51 , a medium storage tank 52 and a fixing member 53 . One end of the medium delivery pipe 51 is rotatably connected to the cavity 31 . The other end of the medium delivery pipe 51 communicates with the medium storage tank 52 . The fixing piece 53 is installed on the side wall of the heat exchange box 2 , and the fixing piece 53 is fixedly connected with the medium delivery pipe 51 .

During heat exchange, the pump in the medium storage tank 52 supplies the medium to the medium delivery pipe 51, and the medium enters the cavity 31 of the rotating shaft 3 through the medium delivery pipe 51, and then enters the corresponding cooling chamber through the cavity 31 of the rotating shaft 3. In the sheet 4, the heat exchange between the medium and the absorbing heat on the cooling sheet 4 is completed. The fixing part 53 is installed on the heat exchange box 2 and is fixedly connected with 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 .

In another embodiment, as shown in FIG. 1 , FIG. 2 and FIG. 4 , the medium return assembly includes: a medium return pipe 61 , a rotating disk 62 , a collecting piece 63 and a medium discharge pipe 66 . Each of the cooling fins 4 is provided with the medium return pipe 61 , and one end of the medium return pipe 61 communicates with the heat exchange chamber 41 . The rotating disk 62 is in the shape of a ring, the middle part of which is used for passing the rotating shaft 3 , and the other end of the medium return pipe 61 is connected with the rotating disk. The collection piece 63 is connected with the heat exchange box 2, the middle part of the collection piece 63 is provided with a relief hole 64 for the rotation shaft 3 to pass through, and the top of the collection piece 63 is provided with a collection groove for converging medium 65 , the rotating disk 62 is rotatably installed at the notch of the collecting groove 65 . One end of the medium discharge pipe 66 is connected to the collection tank 65, and the other end is connected to the external mechanism.

The heat-exchanged medium enters the collection tank 65 through the medium return pipe 6 , and then is discharged through the medium outlet pipe 66 communicating with the collection 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, and the rotating disk 62 at the other end of the medium return pipe 61 rotates with the rotating shaft 3 in the collecting groove 65 of the collecting piece 63, The medium flows into the collection tank 65 and then is transported to the external mechanism through the medium discharge pipe 66 .

In another embodiment, as shown in Figures 1 and 2, 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 drive the transmission mechanism 71 to move, and the transmission mechanism 71 drives the rotating shaft 3 to rotate. The rotation mechanism and the deceleration mechanism 72 are provided to reduce the rotation speed of the driving motor 73 so that the flue gas stays in the heat exchange box 2 for a sufficient time so that the heat in the flue gas can be completely absorbed.

The transmission mechanism 7 in this embodiment can be a gear transmission mechanism, and can also be a belt transmission mechanism. The reduction mechanism is an existing reduction gearbox.

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

In another embodiment, as shown in FIG. 4 , in order to further reduce heat loss, a layer of insulation layer 8 is wrapped around the outside of the heat exchange box 2 , and the insulation layer 8 is insulation cotton or airgel felt.

In another embodiment, as shown in FIG. 5 , several grooves 43 are processed on the outer sidewall of the heat sink 4 by shot blasting, and the grooves 43 are used to increase the contact area between the flue gas and the heat sink 4 . Moreover, the heat sink 4 subjected to shot blasting has higher structural strength and higher corrosion resistance.

In another embodiment, in order to further improve the structural strength of the recovery device, the cooling fin 4 and the rotating shaft 3 are integrally formed.

Finally, it should be noted that: the above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still The technical solutions recorded in the foregoing embodiments may be modified, or some technical features thereof may be equivalently replaced. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. An aluminum electrolysis waste heat recovery device, characterized by comprising:

the gas inlet end of the flue gas recovery assembly is arranged at a flue gas outlet of the electrolytic cell;

the side wall of the heat exchange box is provided with a smoke inlet and an exhaust port, and the smoke inlet is connected with a smoke outlet end of the smoke recovery assembly;

the rotating shaft is arranged in the heat exchange box, and a cavity for accommodating a medium is formed in the rotating shaft;

the heat exchange device comprises a plurality of heat dissipation fins, wherein the cross sections of the heat dissipation fins are of arc structures, one ends of the heat dissipation fins are connected with the rotating shaft, heat exchange cavities communicated with the cavities are formed in the heat dissipation fins, and after the heat dissipation fins are installed, concave surfaces of the heat dissipation fins are arranged away from the exhaust port, and a heat exchange channel is formed between two adjacent heat dissipation fins;

the medium conveying component is arranged at one end of the rotating shaft, and the outlet end of the medium conveying pipe is communicated with the cavity;

the medium reflux assembly is arranged at the other end of the rotating shaft, and the inlet end of the medium reflux assembly is communicated with the heat exchange cavity;

the driving assembly is connected with the rotating shaft and drives the rotating shaft to rotate;

the flue gas outlet direction of the flue gas recovery assembly is arranged towards the concave surface of the radiating fin.

2. The aluminum electrolysis waste heat recovery device of claim 1, wherein the flue gas recovery assembly comprises:

the fume collecting hood is arranged at the fume outlet of the electrolytic tank;

one end of the smoke delivery pipeline is connected with the smoke collecting hood, and the other end of the smoke delivery pipeline is connected with the smoke inlet;

and the induced draft fan is arranged on the smoke delivery pipeline, and an air outlet of the induced draft fan faces the smoke inlet.

3. The aluminum electrolysis waste heat recovery device according to claim 1, wherein an auxiliary cooling channel is arranged in the side wall of the heat exchange box, an inlet of the auxiliary cooling channel is positioned at the smoke outlet, an outlet of the auxiliary cooling channel is positioned at the smoke inlet, and the outlet of the auxiliary cooling channel is communicated with the medium backflow component.

4. The aluminum electrolysis waste heat recovery device of claim 1, wherein the medium return assembly comprises:

one end of the medium conveying pipe is rotatably connected into the cavity;

the other end of the medium conveying pipe is communicated with the medium storage box;

and the fixing piece is arranged on the side wall of the heat exchange box and is fixedly connected with the medium conveying pipe.

5. The aluminum electrolysis waste heat recovery device of claim 1, wherein the medium return assembly comprises:

the medium return pipes are arranged on each radiating fin, and one end of each medium return pipe is communicated with the heat exchange cavity;

the rotating disc is in a circular ring shape, the middle part of the rotating disc is used for the rotating shaft to pass through, and the other end of the medium return pipe is connected with the moving disc;

the collecting piece is connected with the heat exchange box, a yielding hole for the rotating shaft to pass through is formed in the middle of the collecting piece, a collecting groove for collecting medium is formed in the top of the collecting piece, and the rotating disc is rotatably arranged at a notch of the collecting groove;

and one end of the medium discharge pipe is connected into the collecting groove, and the other end of the medium discharge pipe is connected into an external mechanism.

6. The aluminum electrolysis waste heat recovery apparatus of claim 1, wherein the drive assembly comprises:

one end of the transmission mechanism is connected with the rotating shaft;

the other end of the transmission mechanism is connected with the speed reducing mechanism;

and the driving motor is connected with the speed reducing mechanism and used for driving the speed reducing mechanism to drive the transmission mechanism to move, and the transmission mechanism drives the rotating shaft to rotate.

7. The apparatus according to claim 6, wherein the rotation speed of the rotation shaft is 10 to 20 rotations per minute.

8. The aluminum electrolysis waste heat recovery apparatus according to claim 1, wherein the aluminum electrolysis preheating recovery apparatus comprises:

the heat preservation layer is wrapped and arranged on the outer side of the heat exchange box.

9. The aluminum electrolysis waste heat recovery device according to claim 1, wherein a plurality of grooves are irregularly arranged on the outer side wall of the radiating fin.

10. The aluminum electrolysis waste heat recovery device according to claim 1, wherein the heat radiating fin and the rotating shaft are of an integrally formed structure.