Aluminum electrolytic cell thermal stability regulating device and aluminum electrolytic cell equipment using the device

Abstract

The present invention relates to the technical field of aluminum electrolytic cells, and specifically to an aluminum electrolytic cell thermal stability regulating device and an aluminum electrolytic cell equipment using the device. The regulating device comprises an upper heat exchanger, a side heat exchanger, and a bottom heat exchanger. The upper heat exchanger is provided with an upper inlet and an upper outlet, the side heat exchanger is provided with a side inlet and a side outlet, and the bottom heat exchanger is provided with a bottom inlet and a bottom outlet; the side heat exchanger is provided with two side inlets, and the two side inlets are respectively connected to the upper outlet and the bottom outlet through a connecting pipe. When the electrolytic cell reduces the input of electric energy during the daytime peak, the heat dissipation is reduced by reducing or stopping the input of the heat exchange medium, so as to keep the electrolytic cell warm, so that the electrolytic cell melt maintains energy balance and the thermal stability remains unchanged. When the electrolytic cell increases the input of electric energy during the night trough period, the heat dissipation is increased by increasing the input of the heat exchange medium, so as to keep the electrolytic cell melt energy balance and the thermal stability remains unchanged.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum electrolysis cells, and in particular to a thermal stability regulating device for an aluminum electrolysis cell and aluminum electrolysis cell equipment using the device. Background Art

[0002] At present, the aluminum electrolysis industry has been using the traditional Hall-Heroult method, and the electrolyte used is a cryolite-alumina molten salt system. Figure 1 The figure shows an aluminum electrolytic cell device in the prior art, including a cell bottom wall 1, a cathode carbon block 3, a cell side wall 2, an electrolyte and aluminum melt 4, an anode carbon block 5, an upper covering material 8, an anode steel claw 9, an anode guide rod 7 and a gas collecting cover plate 6. After power is turned on, the current passes through the anode guide rod 7, the anode steel claw 9, the anode carbon block 5, the electrolyte and aluminum melt 4, and the cathode carbon block 3 in sequence, and the aluminum liquid generated by electrolysis is formed on the cathode. During the electrolysis process, the electrolyte dissipates heat through the cell side wall, and the electrolyte close to the cell side wall solidifies to form a cell side crust. The shape of the cell side crust is determined by the electrolyte temperature. If the temperature is high, a part of it will melt, and if the temperature is low, the cell side crust will become thicker.

[0003] At present, the mainstream trough capacity in the aluminum electrolysis industry is above 400kA, with an annual production capacity of 500,000 tons per series and a total annual production capacity of 40 million tons. Therefore, large load and high stability are the special requirements of current aluminum electrolysis enterprises for electricity. According to the social industrial and residential electricity consumption rules, the peak period is from 8:00 to 22:00 every day, and the trough period is from 22:00 to 8:00. The electricity price difference between the peak period and the trough period is 1 times. The electricity consumption of aluminum electrolysis is large. It takes about 13,500 kWh of electricity to produce 1 ton of aluminum. If the electrolytic cell uses the peak and trough electricity price rules, it can reduce the electricity consumption by 10% to 20% during the day and increase the electricity consumption by 10% to 20% at night, which can greatly save electricity costs.

[0004] However, the production of aluminum electrolytic cells requires that the melt maintains a stable electrolysis temperature, that is, the melt energy is balanced. When the power input is reduced during the day, the electrolytic cell will become cold, the electrolytic cell will enter a cold stroke, the electrolyte will crust on the sides, top, and bottom, the fluctuation will intensify, and the cell condition will deteriorate. When the power input is increased at night, the electrolytic cell will become hot, the electrolytic cell will enter a hot stroke, the side and top crusts will melt, the cell temperature will rise, the current efficiency will decrease, the energy consumption will increase, and the cell condition will deteriorate. Therefore, it is urgent to develop a thermal stability regulating device that can maintain the energy balance of the melt in the cell when the power input to the electrolytic cell fluctuates. Summary of the invention

[0005] The object of the present invention is to provide a thermal stability regulating device for an aluminum electrolytic cell which can maintain the energy balance of the melt in the cell when the input electrical energy of the cell fluctuates. The object of the present invention is also to provide an aluminum electrolytic cell equipment using the above device.

[0006] In order to achieve the above-mentioned purpose, the thermal stability regulating device of the aluminum electrolytic cell in the present invention adopts the following technical scheme:

[0007] A thermal stability regulating device for an aluminum electrolytic cell comprises an upper heat exchanger for being arranged on the upper covering material surface of the aluminum electrolytic cell, a side heat exchanger for being arranged at the side wall position of the aluminum electrolytic cell, and a bottom heat exchanger for being arranged at the bottom wall position of the aluminum electrolytic cell, wherein the upper heat exchanger is provided with an upper inlet and an upper outlet for heat exchange medium to enter and flow out respectively, the side heat exchanger is provided with a side inlet and a side outlet for heat exchange medium to enter and flow out respectively, and the bottom heat exchanger is provided with a bottom inlet and a bottom outlet for heat exchange medium to enter and flow out respectively; the side heat exchanger is provided with one side inlet, and the side inlet is connected to the upper outlet or / and the bottom outlet through a connecting pipeline, or the side heat exchanger is provided with two side inlets, and the two side inlets are connected to the upper outlet and the bottom outlet respectively through connecting pipelines.

[0008] The beneficial effect of the above technical solution is that the regulating device includes an upper heat exchanger, a side heat exchanger and a bottom heat exchanger. The upper heat exchanger is used to be arranged on the upper covering material surface of the aluminum electrolytic cell, and can adjust the upper temperature of the aluminum electrolytic cell. The side heat exchanger is used to be arranged at the side wall position of the aluminum electrolytic cell, and can adjust the temperature of the side wall of the cell. The bottom heat exchanger is used to be arranged at the bottom wall position of the aluminum electrolytic cell, and can adjust the temperature of the bottom wall of the cell, thereby realizing all-round regulation of the temperature of the aluminum electrolytic cell. For example, when the electrolytic cell reduces the input of electric energy during the daytime peak, by reducing or stopping the input of the heat exchange medium, the heat dissipation is reduced, and the electrolytic cell is insulated, so that the electrolytic cell melt maintains energy balance and thermal stability. When the electrolytic cell increases the input of electric energy during the trough period at night, by increasing the input of the heat exchange medium, the heat dissipation is increased, so that the electrolytic cell melt maintains energy balance and thermal stability.

[0009] Furthermore, there may be one or two side inlets on the side heat exchanger, and the side inlet is connected to the upper outlet and / or the bottom outlet through a connecting pipe, that is, the heat exchange medium flows through the upper heat exchanger and / or the bottom heat exchanger and then enters the side heat exchanger. This not only simplifies the structure and facilitates the arrangement and connection of the pipelines, but also the heat exchange medium that first passes through the upper heat exchanger and / or the bottom heat exchanger is equivalent to being preheated, and the heat carried by the heat exchange medium can be further increased when passing through the side heat exchanger, which is convenient for heat recovery and utilization.

[0010] Furthermore, the upper inlet is connected to a first inlet pipeline, and a first inlet valve is installed on the first inlet pipeline.

[0011] The beneficial effect of the above technical solution is that it is convenient to control the input of the heat exchange medium.

[0012] Furthermore, a first connecting pipeline is connected between the upper outlet and the side inlet, a first bypass is connected between the first connecting pipeline and the first inlet pipeline, a first bypass valve is installed on the first bypass, and the first inlet valve is located downstream of the connection position between the first inlet pipeline and the first bypass.

[0013] The beneficial effect of the above technical solution is that through the first inlet valve, the first bypass and the first bypass valve, the heat exchange medium can be controlled to pass through the upper heat exchanger first and then through the side heat exchanger, or not pass through the upper heat exchanger and directly pass through the side heat exchanger. Adjustments can be made according to actual conditions, and the use is more flexible.

[0014] Furthermore, a second inlet pipeline is connected to the bottom inlet, and a second inlet valve is installed on the second inlet pipeline; there are two side inlets, one of which is connected to the upper outlet, and the other side inlet is connected to the bottom outlet through a second connecting pipeline, a second bypass is connected between the second connecting pipeline and the second inlet pipeline, and a second bypass valve is installed on the second bypass, and the second inlet valve is located downstream of the connection position between the second inlet pipeline and the second bypass.

[0015] The beneficial effect of the above technical solution is that the second inlet pipeline and the second inlet valve installed thereon can conveniently control the input of the heat exchange medium. At the same time, through the second inlet valve, the second bypass and the second bypass valve, the heat exchange medium can be controlled to pass through the bottom heat exchanger first and then through the side heat exchanger, or not through the bottom heat exchanger but directly through the side heat exchanger. Adjustments can be made according to actual conditions, and the use is more flexible.

[0016] Furthermore, a second inlet pipeline is connected to the bottom inlet, and a second inlet valve is installed on the second inlet pipeline.

[0017] The beneficial effect of the above technical solution is that the second inlet pipeline and the second inlet valve installed thereon can conveniently control the input of the heat exchange medium.

[0018] Furthermore, a second connecting pipeline is connected between the bottom outlet and the side inlet, a second bypass is connected between the second connecting pipeline and the second inlet pipeline, a second bypass valve is installed on the second bypass, and the second inlet valve is located downstream of the connection position between the second inlet pipeline and the second bypass.

[0019] The beneficial effect of the above technical solution is that through the second inlet valve, the second bypass and the second bypass valve, the heat exchange medium can be controlled to pass through the bottom heat exchanger first and then through the side heat exchanger, or not through the bottom heat exchanger but directly through the side heat exchanger. Adjustments can be made according to actual conditions, making it more flexible to use.

[0020] Furthermore, there are two side heat exchangers which are respectively arranged at the left and right side walls of the aluminum electrolysis cell. The side outlets of the two side heat exchangers are respectively connected with outlet pipelines, and the two outlet pipelines are intersected and connected.

[0021] The beneficial effects of the above technical solution are: the regulation effect of the two side heat exchangers is better, and at the same time the outlet pipes of the two side heat exchangers are intersected and connected, which is convenient for the heat exchange medium to be discharged to the next process together, and the structure is simple.

[0022] Furthermore, two upper heat exchangers are symmetrically arranged on the left and right, the upper outlet of the left upper heat exchanger is connected to the side inlet of the left side heat exchanger, and the upper outlet of the right upper heat exchanger is connected to the side inlet of the right side heat exchanger.

[0023] The beneficial effects of the above technical solution are: the two upper heat exchangers have better regulation effect, and at the same time, the upper outlets of the two upper heat exchangers are respectively connected to the side inlets of the side heat exchangers, the structure is more reasonable, the distribution of heat exchange medium is more uniform, and the use effect is better.

[0024] Furthermore, two bottom heat exchangers are symmetrically arranged on the left and right, the bottom outlet of the left bottom heat exchanger is connected to the side inlet of the left side heat exchanger, and the bottom outlet of the right bottom heat exchanger is connected to the side inlet of the right side heat exchanger.

[0025] The beneficial effects of the above technical solution are: the two bottom heat exchangers have better regulation effects, and at the same time, the bottom outlets of the two bottom heat exchangers are respectively connected to the side inlets of the side heat exchangers, the structure is more reasonable, the distribution of the heat exchange medium is more uniform, and the use effect is better.

[0026] In order to achieve the above-mentioned purpose, the aluminum electrolysis cell equipment in the present invention adopts the following technical scheme:

[0027] The aluminum electrolytic cell equipment comprises a cell bottom wall, a cell side wall, a cathode carbon block, an anode carbon block, and an upper covering material. The aluminum electrolytic cell equipment also comprises an aluminum electrolytic cell thermal stability regulating device, which comprises an upper heat exchanger arranged on the surface of the upper covering material, a side heat exchanger arranged on the cell side wall, and a bottom heat exchanger arranged on the cell bottom wall. The upper heat exchanger is provided with an upper inlet and an upper outlet for heat exchange medium to enter and flow out, respectively, the side heat exchanger is provided with a side inlet and a side outlet for heat exchange medium to enter and flow out, respectively, and the bottom heat exchanger is provided with a bottom inlet and a bottom outlet for heat exchange medium to enter and flow out, respectively; the side heat exchanger is provided with one side inlet, and the side inlet is connected to the upper outlet or / and the bottom outlet through a connecting pipeline, or the side heat exchanger is provided with two side inlets, and the two side inlets are connected to the upper outlet and the bottom outlet respectively through connecting pipelines.

[0028] The beneficial effect of the above technical solution is that the regulating device includes an upper heat exchanger, a side heat exchanger and a bottom heat exchanger. The upper heat exchanger is arranged on the upper covering material surface of the aluminum electrolytic cell, and can adjust the upper temperature of the aluminum electrolytic cell. The side heat exchanger is arranged on the side wall of the aluminum electrolytic cell, and can adjust the temperature of the side wall. The bottom heat exchanger is arranged on the bottom wall of the aluminum electrolytic cell, and can adjust the temperature of the bottom wall, thereby realizing all-round regulation of the temperature of the aluminum electrolytic cell. For example, when the electrolytic cell reduces the input of electric energy during the daytime peak, by reducing or stopping the input of the heat exchange medium, the heat dissipation is reduced, and the electrolytic cell is insulated, so that the electrolytic cell melt maintains energy balance and thermal stability. When the electrolytic cell increases the input of electric energy during the trough period at night, by increasing the input of the heat exchange medium, the heat dissipation is increased, so that the electrolytic cell melt maintains energy balance and thermal stability.

[0029] Furthermore, there may be one or two side inlets on the side heat exchanger, and the side inlet is connected to the upper outlet and / or the bottom outlet through a connecting pipe, that is, the heat exchange medium flows through the upper heat exchanger and / or the bottom heat exchanger and then enters the side heat exchanger. This not only simplifies the structure and facilitates the arrangement and connection of the pipelines, but also the heat exchange medium that first passes through the upper heat exchanger and / or the bottom heat exchanger is equivalent to being preheated, and the heat carried by the heat exchange medium can be further increased when passing through the side heat exchanger, which is convenient for heat recovery and utilization.

[0030] Furthermore, the upper inlet is connected to a first inlet pipeline, and a first inlet valve is installed on the first inlet pipeline.

[0031] The beneficial effect of the above technical solution is that it is convenient to control the input of the heat exchange medium.

[0032] Furthermore, a first connecting pipeline is connected between the upper outlet and the side inlet, a first bypass is connected between the first connecting pipeline and the first inlet pipeline, a first bypass valve is installed on the first bypass, and the first inlet valve is located downstream of the connection position between the first inlet pipeline and the first bypass.

[0033] The beneficial effect of the above technical solution is that through the first inlet valve, the first bypass and the first bypass valve, the heat exchange medium can be controlled to pass through the upper heat exchanger first and then through the side heat exchanger, or not pass through the upper heat exchanger and directly pass through the side heat exchanger. Adjustments can be made according to actual conditions, and the use is more flexible.

[0034] Furthermore, a second inlet pipeline is connected to the bottom inlet, and a second inlet valve is installed on the second inlet pipeline; there are two side inlets, one of which is connected to the upper outlet, and the other side inlet is connected to the bottom outlet through a second connecting pipeline, a second bypass is connected between the second connecting pipeline and the second inlet pipeline, and a second bypass valve is installed on the second bypass, and the second inlet valve is located downstream of the connection position between the second inlet pipeline and the second bypass.

[0035] The beneficial effect of the above technical solution is that the second inlet pipeline and the second inlet valve installed thereon can conveniently control the input of the heat exchange medium. At the same time, through the second inlet valve, the second bypass and the second bypass valve, the heat exchange medium can be controlled to pass through the bottom heat exchanger first and then through the side heat exchanger, or not through the bottom heat exchanger but directly through the side heat exchanger. Adjustments can be made according to actual conditions, and the use is more flexible.

[0036] Furthermore, a second inlet pipeline is connected to the bottom inlet, and a second inlet valve is installed on the second inlet pipeline.

[0037] The beneficial effect of the above technical solution is that the second inlet pipeline and the second inlet valve installed thereon can conveniently control the input of the heat exchange medium.

[0038] Furthermore, a second connecting pipeline is connected between the bottom outlet and the side inlet, a second bypass is connected between the second connecting pipeline and the second inlet pipeline, a second bypass valve is installed on the second bypass, and the second inlet valve is located downstream of the connection position between the second inlet pipeline and the second bypass.

[0039] The beneficial effect of the above technical solution is that through the second inlet valve, the second bypass and the second bypass valve, the heat exchange medium can be controlled to pass through the bottom heat exchanger first and then through the side heat exchanger, or not through the bottom heat exchanger but directly through the side heat exchanger. Adjustments can be made according to actual conditions, making it more flexible to use.

[0040] Furthermore, there are two side heat exchangers which are respectively arranged at the left and right side walls of the aluminum electrolysis cell. The side outlets of the two side heat exchangers are respectively connected with outlet pipelines, and the two outlet pipelines are intersected and connected.

[0041] The beneficial effects of the above technical solution are: the regulation effect of the two side heat exchangers is better, and at the same time the outlet pipes of the two side heat exchangers are intersected and connected, which is convenient for the heat exchange medium to be discharged to the next process together, and the structure is simple.

[0042] Furthermore, two upper heat exchangers are symmetrically arranged on the left and right, the upper outlet of the left upper heat exchanger is connected to the side inlet of the left side heat exchanger, and the upper outlet of the right upper heat exchanger is connected to the side inlet of the right side heat exchanger.

[0043] The beneficial effects of the above technical solution are: the two upper heat exchangers have better regulation effect, and at the same time, the upper outlets of the two upper heat exchangers are respectively connected to the side inlets of the side heat exchangers, the structure is more reasonable, the distribution of heat exchange medium is more uniform, and the use effect is better.

[0044] Furthermore, two bottom heat exchangers are symmetrically arranged on the left and right, the bottom outlet of the left bottom heat exchanger is connected to the side inlet of the left side heat exchanger, and the bottom outlet of the right bottom heat exchanger is connected to the side inlet of the right side heat exchanger.

[0045] The beneficial effects of the above technical solution are: the two bottom heat exchangers have better regulation effects, and at the same time, the bottom outlets of the two bottom heat exchangers are respectively connected to the side inlets of the side heat exchangers, the structure is more reasonable, the distribution of the heat exchange medium is more uniform, and the use effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a structural schematic diagram of aluminum electrolytic cell equipment in the prior art;

[0047] Figure 2 It is a schematic structural diagram of the aluminum electrolytic cell equipment in the present invention.

[0048] In the figure: 1. bottom wall of the tank; 2. side wall of the tank; 3. cathode carbon block; 4. electrolyte and aluminum melt; 5. anode carbon block; 6. gas collecting cover plate; 7. anode guide rod; 8. upper covering material; 9. anode steel claw; 10. upper heat exchanger; 11. side heat exchanger; 12. bottom heat exchanger; 13. first inlet pipeline; 14. first inlet valve; 15. first connecting pipeline; 16. first bypass; 17. first bypass valve; 18. outlet pipeline; 19. second inlet pipeline; 20. second inlet valve; 21. second connecting pipeline; 22. second bypass; 23. second bypass valve. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0050] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0051] It should be noted that relational terms such as "first" and "second" that may appear are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, terms such as "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by a sentence such as "comprises a..." does not exclude the existence of other identical elements in the process, method, article or device that includes the element.

[0052] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0053] The preferred embodiment of the aluminum electrolysis cell equipment of the present invention is as follows Figure 2 As shown, it includes a tank bottom wall 1, a cathode carbon block 3, a tank side wall 2, an electrolyte and aluminum melt 4, an anode carbon block 5, an upper covering material 8, an anode steel claw 9, an anode guide rod 7 and a gas collecting cover plate 6. The structure and working principle of this part are the same as those of the prior art.

[0054] The present invention is different from the prior art in that the aluminum electrolysis cell equipment also includes an aluminum electrolysis cell thermal stability regulating device, which includes an upper heat exchanger 10 arranged on the surface of the upper covering material 8, a side heat exchanger 11 arranged at the position of the cell side wall 2, and a bottom heat exchanger 12 arranged at the position of the cell bottom wall 1.

[0055] There are two upper heat exchangers 10, which are arranged symmetrically with respect to the center of the electrolytic cell. A heat preservation plate is provided on the outside of each upper heat exchanger 10, and is in close contact with the surface of the upper covering material 8. Each upper heat exchanger 10 is provided with an upper inlet and an upper outlet for the heat exchange medium to enter and flow out, respectively. The heat exchange medium can be air, water or heat transfer oil. The upper inlet is connected to a first inlet pipeline 13, and a first inlet valve 14 is installed on the first inlet pipeline 13 to facilitate the control of the entry of low-temperature heat exchange medium.

[0056] There are two side heat exchangers 11, which are respectively arranged at the left and right side walls of the aluminum electrolytic cell. A heat preservation plate is arranged on the outside of each side heat exchanger 11, and is close to the surface of the side wall 2 of the cell. Each side heat exchanger 11 is provided with a side inlet and a side outlet for the heat exchange medium to enter and flow out, respectively, and each side heat exchanger 11 has two side inlets, one of which is connected to the upper outlet of the upper heat exchanger 10 through the first connecting pipe 15. Due to the left-right symmetry in structure, the upper outlet of the left upper heat exchanger is connected to one of the side inlets of the left side heat exchanger, and the upper outlet of the right upper heat exchanger is connected to one of the side inlets of the right side heat exchanger.

[0057] There are also two bottom heat exchangers 12, which are also arranged symmetrically with respect to the center of the electrolytic cell. Each bottom heat exchanger 12 is provided with a heat preservation plate on the outside, and is close to the surface of the bottom wall 1 of the cell. Each bottom heat exchanger 12 is provided with a bottom inlet and a bottom outlet for the heat exchange medium to enter and flow out, respectively. The bottom inlet is connected to a second inlet pipeline 19, and a second inlet valve 20 is installed on the second inlet pipeline 19 to facilitate the control of the entry of low-temperature heat exchange medium. The other side inlet of the side heat exchanger 11 is connected to the bottom outlet of the bottom heat exchanger 12 through a second connecting pipeline 21. Due to the left-right symmetry in structure, the bottom outlet of the left bottom heat exchanger is connected to the other side inlet of the left side heat exchanger, and the bottom outlet of the right bottom heat exchanger is connected to the other side inlet of the right side heat exchanger.

[0058] In this way, the heat exchange medium can first pass through the upper heat exchanger 10 and the bottom heat exchanger 12, and then pass through the side heat exchanger 11, which can not only simplify the structure and facilitate the arrangement and connection of the pipelines, but also the heat exchange medium that first passes through the upper heat exchanger 10 and the bottom heat exchanger 12 is equivalent to being preheated. When passing through the side heat exchanger 11, the heat carried by the heat exchange medium can be further increased, which is convenient for heat recovery and utilization.

[0059] like Figure 2 As shown, a first bypass 16 is connected between the first connecting pipeline 15 and the first inlet pipeline 13, a first bypass valve 17 is installed on the first bypass 16, and the first inlet valve 14 is located downstream of the connection position between the first inlet pipeline 13 and the first bypass 16. In this way, through the control of the first inlet valve 14 and the first bypass valve 17, the heat exchange medium can first pass through the upper heat exchanger 10 and then pass through the side heat exchanger 11, or directly pass through the side heat exchanger 11 without passing through the upper heat exchanger 10, which can be adjusted according to actual conditions, and the use is more flexible.

[0060] In addition, a second bypass 22 is connected between the second connecting pipeline 21 and the second inlet pipeline 19, a second bypass valve 23 is installed on the second bypass 22, and the second inlet valve 20 is located downstream of the connection position between the second inlet pipeline 19 and the second bypass 22. In this way, through the control of the second inlet valve 20 and the second bypass valve 23, the heat exchange medium can first pass through the bottom heat exchanger 12 and then pass through the side heat exchanger 11, or directly pass through the side heat exchanger 11 without passing through the bottom heat exchanger 12. Adjustments can be made according to actual conditions, and the use is more flexible.

[0061] The working principle of the thermal stability regulating device of the aluminum electrolytic cell in the present invention is:

[0062] The low-temperature heat exchange medium enters the upper heat exchanger 10 and the bottom heat exchanger 12 through the first inlet pipeline 13 and the second inlet pipeline 19 for heat exchange respectively. The medium after heat exchange enters the side heat exchanger 11 for secondary heat exchange. The final high-temperature medium is used for waste heat utilization through the outlet pipeline 18.

[0063] The functions of the upper heat exchanger 10, the side heat exchanger 11, and the bottom heat exchanger 12 are, first, when the electric energy input of the electrolytic cell is reduced during the daytime, by reducing or stopping the input of the heat exchange medium, the heat dissipation is reduced, and the electrolytic cell is kept warm, so that the electrolytic cell melt maintains energy balance and thermal stability. That is, the upward heat dissipation of the electrolyte and the aluminum melt 4 in the electrolytic cell through the anode carbon block 5 and the upper covering material 8 is reduced, the heat dissipation to the side through the tank side wall 2 is reduced, and the downward heat dissipation through the cathode carbon block 3 and the tank bottom wall 1 is reduced. Second, when the electric energy input of the electrolytic cell is increased during the night trough period, the heat dissipation is increased by increasing the input of the heat exchange medium, so that the electrolytic cell melt maintains energy balance and thermal stability. That is, the upward heat dissipation of the electrolyte and the aluminum melt 4 through the anode carbon block 5 and the upper covering material 8 is increased, the heat dissipation to the side through the tank side wall 2 is increased, and the downward heat dissipation through the cathode carbon block 3 and the tank bottom wall 1 is increased.

[0064] Among them, the adjustment amount of the heat exchange medium can be considered based on the fact that the initial crystallization temperature of the electrolyte remains unchanged and the superheat is maintained at 8-15°C, while observing the changes in the anode center seam, bottom legs, and side furnace walls.

[0065] In other embodiments of the aluminum electrolysis cell equipment, only one of the bottom heat exchanger, the upper heat exchanger and the side heat exchanger may be provided.

[0066] In other embodiments of the aluminum electrolysis cell equipment: the first bypass and the second bypass may not be provided, and the heat exchange medium first passes through the upper heat exchanger and the bottom heat exchanger, and then passes through the side heat exchanger.

[0067] In other embodiments of the aluminum electrolysis cell equipment: the first inlet valve is not installed on the first inlet pipeline, and the second inlet valve is not installed on the second inlet pipeline, and the input control of the heat exchange medium is set in the pipeline further upstream.

[0068] In other embodiments of the aluminum electrolysis cell equipment: only one side inlet is provided on the side heat exchanger, in which case the side inlet is connected to the upper outlet through a connecting pipe, or the side inlet is connected to the bottom outlet through a connecting pipe, or the side inlet is connected to both the upper outlet and the bottom outlet through a Y-shaped pipe.

[0069] In other embodiments of the aluminum electrolysis cell apparatus: the side heat exchangers may be embedded in the cell side walls, while the bottom heat exchangers may be embedded in the cell bottom wall.

[0070] An embodiment of the thermal stability regulating device for an aluminum electrolytic cell in the present invention is as follows: The specific structure of the thermal stability regulating device for an aluminum electrolytic cell is the same as the thermal stability regulating device for an aluminum electrolytic cell in the above-mentioned aluminum electrolytic cell equipment embodiment, and will not be repeated here.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A thermal stability regulating device for an aluminum electrolytic cell, characterized in that: The invention comprises an upper heat exchanger (10) for being arranged on the surface of the upper covering material (8) of the aluminum electrolytic cell, a side heat exchanger (11) for being arranged at the position of the side wall (2) of the aluminum electrolytic cell, and a bottom heat exchanger (12) for being arranged at the position of the bottom wall (1) of the aluminum electrolytic cell. The upper heat exchanger (10) is provided with an upper inlet and an upper outlet for heat exchange medium to enter and flow out respectively, the side heat exchanger (11) is provided with a side inlet and a side outlet for heat exchange medium to enter and flow out respectively, and the bottom heat exchanger (12) is provided with a bottom inlet and a bottom outlet for heat exchange medium to enter and flow out respectively; the side heat exchanger (11) is provided with one side inlet, and the side inlet is connected to the upper outlet or / and the bottom outlet through a connecting pipeline, or the side heat exchanger (11) is provided with two side inlets, and the two side inlets are connected to the upper outlet and the bottom outlet respectively through connecting pipelines.

2. The thermal stability regulating device for an aluminum electrolytic cell according to claim 1, characterized in that: The upper inlet is connected to a first inlet pipeline (13), and a first inlet valve (14) is installed on the first inlet pipeline (13).

3. The thermal stability regulating device for an aluminum electrolytic cell according to claim 2, characterized in that: A first connecting pipeline (15) is connected between the upper outlet and the side inlet, a first bypass (16) is connected between the first connecting pipeline (15) and the first inlet pipeline (13), a first bypass valve (17) is installed on the first bypass (16), and the first inlet valve (14) is located downstream of the connection position between the first inlet pipeline (13) and the first bypass (16).

4. The thermal stability regulating device for an aluminum electrolytic cell according to claim 3, characterized in that: The bottom inlet is connected to a second inlet pipeline (19), and a second inlet valve (20) is installed on the second inlet pipeline (19); there are two side inlets, one of which is connected to the upper outlet, and the other side inlet is connected to the bottom outlet via a second connecting pipeline (21); a second bypass (22) is connected between the second connecting pipeline (21) and the second inlet pipeline (19), and a second bypass valve (23) is installed on the second bypass (22); the second inlet valve (20) is located downstream of the connection position between the second inlet pipeline (19) and the second bypass (22).

5. The thermal stability regulating device for an aluminum electrolytic cell according to claim 1 or 2, characterized in that: The bottom inlet is connected to a second inlet pipeline (19), and a second inlet valve (20) is installed on the second inlet pipeline (19).

6. The thermal stability regulating device for an aluminum electrolytic cell according to claim 5, characterized in that: A second connecting pipeline (21) is connected between the bottom outlet and the side inlet, a second bypass (22) is connected between the second connecting pipeline (21) and the second inlet pipeline (19), a second bypass valve (23) is installed on the second bypass (22), and the second inlet valve (20) is located downstream of the connection position between the second inlet pipeline (19) and the second bypass (22).

7. The thermal stability regulating device for an aluminum electrolytic cell according to any one of claims 1 to 4, characterized in that: There are two side heat exchangers (11) and they are used to be respectively arranged at the left and right side walls (2) of the aluminum electrolysis cell. The side outlets of the two side heat exchangers (11) are respectively connected to outlet pipelines (18), and the two outlet pipelines (18) are intersected and connected.

8. The thermal stability regulating device for an aluminum electrolytic cell according to claim 7, characterized in that: Two upper heat exchangers (10) are symmetrically arranged on the left and right. The upper outlet of the left upper heat exchanger is connected to the side inlet of the left side heat exchanger, and the upper outlet of the right upper heat exchanger is connected to the side inlet of the right side heat exchanger.

9. The thermal stability regulating device for an aluminum electrolytic cell according to claim 7, characterized in that: Two bottom heat exchangers (12) are symmetrically arranged on the left and right. The bottom outlet of the left bottom heat exchanger is connected to the side inlet of the left side heat exchanger, and the bottom outlet of the right bottom heat exchanger is connected to the side inlet of the right side heat exchanger.

10. Aluminum electrolytic cell equipment, comprising a cell bottom wall, a cell side wall, a cathode carbon block, an anode carbon block, and an upper covering material, characterized in that: The aluminum electrolysis cell equipment also includes the aluminum electrolysis cell thermal stability regulating device as described in any one of claims 1 to 9.

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