Aluminum electrolysis cell thermal balance adjustment device and adjustment method

Abstract

An aluminum electrolysis cell thermal balance adjustment device and an adjustment method. The device comprises an aluminum electrolysis cell, a heat flow adjustment device, an air supply pipe, a variable-frequency fan, an air path control system, and a temperature measurement device. The air path control system adjusts the air volume of the variable-frequency fan and the opening degree of a flow valve in the air supply pipe on the basis of measurement data of the temperature measurement device, and controls and adjusts the heat dissipation amount of a side wall of a cell shell of the electrolysis cell in partitions.

Description

Thermal balance adjustment device and adjustment method for aluminum electrolytic cell Technical Field

[0001] This invention relates to the field of aluminum electrolysis technology, specifically to an aluminum electrolysis cell thermal balance adjustment device and adjustment method. Background Technology

[0002] Currently, electricity costs account for about 40% of the production costs in my country's electrolytic aluminum industry. Electricity costs, to a certain extent, determine the competitiveness of electrolytic aluminum enterprises. In order to reduce production costs, relevant researchers have proposed that some new energy power can be connected to the production of electrolytic aluminum, making the aluminum electrolytic cell a "virtual battery" for new energy power generation. Although this measure can significantly reduce the production cost of electrolytic aluminum, it poses an additional challenge to the aluminum electrolytic cell that operates stably 24 hours a day.

[0003] The stable operation of existing aluminum electrolytic cells requires maintaining a relatively narrow "thermal balance" range. If aluminum electrolytic cells are to become "virtual batteries" for new energy power generation, additional adjustment measures are needed to maintain "thermal balance". In particular, the parts such as the side walls of the cell shell, which account for a large proportion of the total heat dissipation, have become the "breakthrough point" for adjustment measures.

[0004] In light of the current form of electrolytic cells and actual production needs, it is essential to develop a heat balance adjustment device for aluminum electrolytic cells that is highly adaptable and has a large adjustment capacity. Previous devices for adjusting heat dissipation from the side wall of the cell shell fall into the following categories: Patent CN111690952A, a flexible production device for aluminum electrolytic cells, which adjusts the temperature of the cell shell through a blowpipe on the side of the shell; and Patent CN117488367A, a flexible production energy control device for aluminum electrolytic cells, which adjusts heat dissipation by installing a heat exchange device on the outer wall of the aluminum electrolytic cell shell.

[0005] In summary, some devices can only increase heat dissipation in aluminum electrolysis cells without providing external insulation, while others have overly simplistic structures, fail to be designed from the theoretical perspective of convective heat transfer, and lack supporting control methods. Summary of the Invention

[0006] In view of the above-mentioned shortcomings and deficiencies, the present invention provides a thermal balance adjustment device and adjustment method for aluminum electrolysis cells, which can adjust the heat dissipation according to the temperature of the side wall of the aluminum electrolysis cell shell, so that the electrolysis cell can maintain stable production even when the green energy power generation power fluctuates.

[0007] Specifically, the present invention provides a thermal balance regulating device for an aluminum electrolytic cell, comprising an aluminum electrolytic cell, multiple heat flow regulating devices, an air supply duct, a variable frequency fan, an air path control system, and a temperature measuring device. The aluminum electrolytic cell's shell sidewall includes multiple control zones. The multiple heat flow regulating devices are disposed outside the shell sidewall of the aluminum electrolytic cell. Each of the multiple heat flow regulating devices is configured to regulate the airflow output to a corresponding control zone among the multiple control zones. The air supply duct includes a main pipe connected to the variable frequency fan, and multiple branch pipes are provided on the main pipe. Each of the multiple branch pipes is connected to the variable frequency fan. One of the multiple heat flow regulating devices is connected, and each branch pipe is equipped with a flow regulating valve. The temperature measuring device is installed on the side wall of the aluminum electrolysis cell shell to acquire temperature measurement data at multiple control areas of the side wall of the aluminum electrolysis cell shell. The temperature measuring device is connected to the gas path control system, which is electrically connected to the variable frequency fan and the flow regulating valve. The gas path control system adjusts the air volume of the variable frequency fan and the flow distribution in the air supply pipe according to the temperature measurement data acquired by the temperature measuring device, so as to control and adjust the heat dissipation of the side wall of the aluminum electrolysis cell shell in zones.

[0008] In one embodiment, the sidewall of the aluminum electrolysis cell is provided with a plurality of stiffening ribs, and the sidewall of the cell is divided into a plurality of control areas by the plurality of stiffening ribs.

[0009] In one embodiment, each heat flow regulating device is located near the corresponding control area.

[0010] In one embodiment, one or more temperature measurement points are provided in each control area.

[0011] In one embodiment, each heat flow regulating device includes a vent plate, a jet tube array, and a housing. The vent plate is arranged parallel to the side wall of the aluminum electrolysis cell housing. The vent plate includes multiple exhaust holes. The jet tube array includes an array of multiple jet tubes. The air outlets of the jet tube array pass through the housing and the vent plate, respectively. Each branch pipe is connected to the jet tube array of the corresponding heat flow regulating device. The air outlets of the jet tube array face the side wall of the aluminum electrolysis cell housing.

[0012] In one embodiment, the plurality of exhaust holes of the vent plate are arranged in a square array, and the ratio of the distance between the centers of two adjacent exhaust holes to the diameter of each exhaust hole is 1.2-1.6.

[0013] The present invention also provides an adjustment method using the above-described aluminum electrolytic cell thermal balance adjustment device, comprising the following steps:

[0014] (S1) Temperature measurement data at the plurality of control areas on the side wall of the aluminum electrolytic cell are obtained through the temperature measuring device;

[0015] (S2) Set the upper temperature limit T of the side wall of the aluminum electrolysis cell shell. max With lower limit T min ;as well as

[0016] (S3) Based on the temperature measurement data obtained by the temperature measuring device, the air volume of the variable frequency fan and the opening degree of the flow regulating valve of the branch pipeline are controlled by the air circuit control system.

[0017] In one embodiment, step (S3) includes:

[0018] (S301) When the temperature measurement data at all control areas of the sidewall of the aluminum electrolysis cell are lower than the lower limit T min When the variable frequency fan is turned off, the heat flow regulating device itself is used to keep the side wall of the aluminum electrolysis cell insulated.

[0019] (S302) When the temperature measurement data at all control areas of the sidewall of the aluminum electrolysis cell are all within the upper temperature limit T max and the lower limit T of the temperature min During this period, the air volume output by each heat flow regulating device is calculated, and the air volume output by the heat flow regulating device is expressed as:

[0020] Among them, V i T represents the air volume output by the i-th heat flow regulating device. i This represents the temperature measurement data of the i-th control zone on the side wall of the aluminum electrolysis cell shell. The temperature design value of the sidewall of the aluminum electrolytic cell shell is represented by a, b, and c, which are solutions to the following system of equations, where n is the number of control zones of the sidewall 110 of the aluminum electrolytic cell shell:

[0021] The specific solution formula is as follows:

[0022] The total air volume output by the variable frequency fan is the sum of the air volumes output by all heat flow regulating devices, and the total air volume output by the variable frequency fan is expressed as:

[0023] Start the variable frequency fan and adjust the power of the variable frequency fan according to the total air volume output by the variable frequency fan;

[0024] Adjust the flow control valves of all branch pipes to their maximum opening;

[0025] (S303) When the temperature measurement data at all control areas of the side wall of the aluminum electrolysis cell are higher than the upper temperature limit, start the variable frequency fan and adjust the variable frequency fan to the maximum power, and adjust the flow regulating valves of all branch pipes to the maximum opening.

[0026] (S304) When the temperature measurement data at one or more control areas of the sidewall of the aluminum electrolysis cell is higher than the upper temperature limit, and the temperature measurement data at the remaining control areas are between the upper temperature limit and the lower temperature limit, the variable frequency fan is started and adjusted to its maximum power. The flow regulating valve of the branch pipe corresponding to the control area where the temperature measurement data is higher than the upper temperature limit is adjusted to its maximum opening. The opening of the flow regulating valve of the remaining branch pipe is adjusted according to the following calculation results, and the opening of the flow regulating valve of the remaining branch pipe is expressed as follows:

[0027] Among them, P i T represents the opening degree of the flow control valve in the i-th branch pipe. i This represents the temperature measurement data of the i-th control zone on the side wall of the aluminum electrolysis cell shell;

[0028] (S305) When the temperature measurement data at one or more control areas of the sidewall of the aluminum electrolysis cell is lower than the lower limit, and the temperature measurement data at the remaining control areas is between the upper limit and the lower limit, the airflow output by the heat flow regulating device corresponding to the control area where the temperature measurement data is between the upper limit and the lower limit is calculated, and the airflow output by the heat flow regulating device is expressed as:

[0029] Among them, V i T represents the air volume output by the i-th heat flow regulating device. i This represents the temperature measurement data of the i-th control zone on the side wall of the aluminum electrolysis cell shell. The temperature design value of the sidewall of the aluminum electrolytic cell shell is represented by a, b, and c, which are solutions to the following system of equations, where n is the number of control zones on the sidewall of the aluminum electrolytic cell shell:

[0030] The specific solution formula is as follows:

[0031] The total air volume output by the variable frequency fan is the sum of the air volume output by the heat flow regulating device corresponding to the control range where the temperature measurement data is between the upper temperature limit and the lower temperature limit. The total air volume output by the variable frequency fan is expressed as:

[0032] Start the variable frequency fan and adjust the power of the variable frequency fan according to the total air volume output by the variable frequency fan;

[0033] The flow control valves of the branch pipes corresponding to the control zone where the temperature measurement data is below the lower limit of the temperature are closed. The opening degree of the flow control valves of the remaining branch pipes is adjusted according to the following calculation results, and the opening degree of the flow control valves of the remaining branch pipes is expressed as follows:

[0034] Among them, P i T represents the opening degree of the flow control valve in the i-th branch pipe. i This represents the temperature measurement data of the i-th control zone on the side wall of the aluminum electrolysis cell shell;

[0035] (S306) When the temperature measurement data at one or more control areas of the sidewall of the aluminum electrolysis cell is lower than the lower limit, the temperature measurement data at one or more control areas is higher than the upper limit, and the temperature measurement data at the remaining control areas is between the upper and lower limits, the variable frequency fan is started and adjusted to its maximum power. The flow regulating valves of the branch pipes corresponding to the control areas where the temperature measurement data is lower than the lower limit are closed, and the flow regulating valves of the branch pipes corresponding to the control areas where the temperature measurement data is higher than the upper limit are adjusted to their maximum opening. The opening of the flow regulating valves of the remaining branch pipes is adjusted according to the following calculation results, and the opening of the flow regulating valves of the remaining branch pipes is expressed as follows:

[0036] Among them, P i T represents the opening degree of the flow control valve in the i-th branch pipe. i This represents the temperature measurement data of the i-th control zone on the side wall of the aluminum electrolysis cell shell;

[0037] (S307) When the temperature measurement data at one or more control areas of the side wall of the aluminum electrolysis cell is higher than the upper temperature limit, and the temperature measurement data at the other control areas is lower than the lower temperature limit, the variable frequency fan is started and the variable frequency fan is adjusted to the maximum power, the flow regulating valve of the branch pipe corresponding to the control area where the temperature measurement data is higher than the upper temperature limit is adjusted to the maximum opening, and the flow regulating valve of the other branch pipe is closed.

[0038] The present invention has the following beneficial effects and advantages:

[0039] 1. This invention provides a heat flow regulating device within the control area between adjacent cradle stiffeners, which can adjust the heat dissipation based on temperature measurement data of each control area on the sidewall of the cradle shell. When the device is not in operation, it can provide external insulation to the sidewall of the cradle shell. When the device is in operation, it can quantitatively adjust the heat dissipation of the sidewall of the cradle shell.

[0040] 2. The heat flow regulating device of the present invention, in conjunction with the air circuit control system, can realize zoned control of the heat dissipation of the side wall of the tank shell;

[0041] 3. The present invention has a simple structure and the overall device can be customized in terms of adjustment capability and appearance size according to the production situation and design specifications of the electrolytic cell, making it highly applicable. Attached Figure Description

[0042] Figure 1 is a flowchart of the aluminum electrolytic cell thermal balance adjustment device of the present invention;

[0043] Figure 2 is a front view schematic diagram of the device structure of the present invention;

[0044] Figure 3 is a schematic diagram of the heat flow regulating device of the present invention;

[0045] Figure 4 is a schematic diagram of the installation position of the heat flow regulating device of the present invention;

[0046] Figure 5 is a schematic diagram of the process for adjusting the thermal balance of the aluminum electrolytic cell according to the present invention.

[0047] In the diagram: 100, aluminum electrolytic cell; 110, cell shell sidewall; 120, cradle stiffener; 200, heat flow regulating device; 210, jet tube array; 220, ventilated plate; 230, outer shell; 300, air supply duct; 310, main duct; 320, branch duct; 321, flow regulating valve; 400, variable frequency fan; 500, air circuit control system; 600, temperature measuring device. Detailed Implementation

[0048] The present invention will be further described below with reference to the accompanying drawings. As shown in Figures 1-2, the present invention provides a thermal balance adjustment device for an aluminum electrolysis cell, which includes an aluminum electrolysis cell 100, multiple heat flow adjustment devices 200, an air supply duct 300, a variable frequency fan 400, an air path control system 500, and a temperature measuring device 600.

[0049] The tank shell sidewall 110 of the aluminum electrolysis cell 100 may include multiple control areas (i.e., areas where the temperature is controlled). As shown in FIG4, in one embodiment, the tank shell sidewall 110 of the aluminum electrolysis cell 100 may be provided with multiple cradle ribs 120, and the tank shell sidewall 110 is divided into multiple control areas by the cradle ribs 120.

[0050] Multiple heat flow regulating devices 200 are disposed outside the tank shell sidewall 110 of the aluminum electrolysis cell 100. Each of the multiple heat flow regulating devices 200 is configured to regulate the airflow output to a corresponding control zone among multiple control zones. In one embodiment, each heat flow regulating device 200 may be disposed near the corresponding control zone.

[0051] The air supply duct 300 includes a main duct and branch ducts 320. The main duct is connected to the variable frequency fan 400, and the main duct has multiple branch ducts 320 (see Figure 4). Each branch duct 320 is connected to a corresponding heat flow regulating device among multiple heat flow regulating devices 200. Therefore, multiple heat flow regulating devices 200 are connected to the variable frequency fan 400 through the air supply duct 300. Each branch duct 320 is equipped with a flow regulating valve.

[0052] A temperature measuring device 600 is disposed on the side wall 110 of the aluminum electrolysis cell 100, and is used to acquire temperature measurement data at multiple control areas of the side wall 110 of the aluminum electrolysis cell 100. The temperature measuring device 600 is connected to the gas path control system 500. In one embodiment, one or more temperature measuring points may be set in each control area. When only one temperature measuring point is set in a certain control area, the temperature measurement data of the control area is the temperature measurement data at that temperature measuring point. When only multiple temperature measuring points are set in a certain control area, the temperature measurement data of the control area is the average value of the temperature measurement data at the multiple temperature measuring points.

[0053] The air circuit control system 500 can be electrically connected to the flow regulating valves of the variable frequency fan 400 and the branch pipes 320 of the air supply duct. The air circuit control system 500 adjusts the air volume of the variable frequency fan 400 and the flow distribution in the air supply duct 300 according to the temperature measurement data obtained by the temperature measuring device 600, so as to control and adjust the heat dissipation of the side wall 110 of the aluminum electrolysis cell 100 in different zones.

[0054] As shown in Figure 3, each heat flow regulating device 200 may include a vent plate 220, a jet tube array 210, and a housing 230. The vent plate 220 is arranged parallel to the side wall 110 of the aluminum electrolysis cell 100. The vent plate 220 includes multiple exhaust holes. The jet tube array 210 includes an array of multiple jet tubes. The air outlets of the jet tube array 210 pass through the housing 230 and the vent plate 220, respectively. Each branch pipe 320 can be connected to the jet tube array 210 of the corresponding heat flow regulating device 200, thereby supplying the air volume output by the variable frequency fan 400 to the heat flow regulating device 200.

[0055] The air outlet of the jet tube array 210 faces the tank shell sidewall 110 of the aluminum electrolysis tank 100. Multiple exhaust holes of the vent plate 220 are distributed above the edge of the jet transition zone. In one embodiment, the multiple exhaust holes of the vent plate 220 can be arranged in a square array, with each exhaust hole having a diameter of d, and the center-to-center distance between two adjacent exhaust holes being 2D, where the ratio of D to d can be 0.6-0.8. The center of the square array formed by the multiple exhaust holes can be the outlet of the jet tube array 210. The outer shell 230 is used to fix the jet tube array 210 and the vent plate 220 within their respective control areas, thereby reducing convective and radiative heat transfer from the tank shell to the outside.

[0056] When the variable frequency fan 400 is at its maximum power, its maximum air volume is V. max When the power of the variable frequency fan 400 is the design power At that time, the air volume of the variable frequency fan 400 is the design air volume. In this scenario, when all the flow control valves of the branch pipes 320 are at their maximum opening (i.e., 100% open), the temperature of the tank shell sidewall 110 is the design temperature value. In other words, the temperature of the tank shell sidewall 110 should reach the design temperature value. The required air volume of the variable frequency fan 400 is the design air volume. At this point, the variable frequency fan 400 should be based on its design power. Working. Design temperature value of 110°C on the side wall of the tank shell. The upper temperature limit T at 110°C on the side wall of the tank shell max With lower limit T min between.

[0057] As shown in Figure 5, the present invention provides an adjustment method using the above-mentioned aluminum electrolysis cell thermal balance adjustment device, which includes the following steps.

[0058] In step S1, temperature measurement data at multiple control areas of the side wall 110 of the aluminum electrolysis cell 100 are acquired by the temperature measuring device 600.

[0059] In step S2, the upper temperature limit T of the side wall 110 of the aluminum electrolysis cell 100 is set. max With lower limit T min ;

[0060] In step S3, based on the temperature measurement data obtained by the temperature measuring device 600, the airflow of the variable frequency fan 400 and the opening degree of the flow regulating valve of the branch pipe 320 are controlled by the air circuit control system 500, so that the temperature of the side wall 110 of the aluminum electrolysis cell 100 is maintained at the upper temperature limit T. max With lower limit T min between.

[0061] Step S2 can be performed before or after step S1.

[0062] Step S3 specifically includes:

[0063] In step S301, when the temperature measurement data at all control areas of the side wall 110 of the aluminum electrolysis cell 100 are lower than the lower limit T... min When the variable frequency fan 400 is turned off, the heat flow regulating device 200 itself will be used to keep the side wall 110 of the aluminum electrolysis cell 100 warm.

[0064] In step S302, when the temperature measurement data at all control areas of the side wall 110 of the aluminum electrolysis cell 100 are all above the upper temperature limit T... max and lower limit T min During this period, the airflow output of each heat flow regulating device 200 is calculated (for example, based on the temperature measurement data of the side wall 110 of the tank shell, a characteristic equation for the airflow output of each heat flow regulating device 200 is established using the principle of multiple linear regression). The airflow output of the heat flow regulating device 200 is expressed as follows:

[0065] Among them, V i T represents the airflow output by the i-th heat flow regulating device 200. i This represents the temperature measurement data of the i-th control zone of the side wall 110 of the aluminum electrolysis cell 100. The temperature design value of the tank shell sidewall 110 of the aluminum electrolysis cell 100 is represented by a, b, and c, which are solutions to the following system of equations, where n is the number of control zones of the tank shell sidewall 110 of the aluminum electrolysis cell 100:

[0066] The specific solution formula is as follows:

[0067] The total air volume output by the variable frequency fan 400 is the sum of the air volumes output by all heat flow regulating devices 200. The total air volume output by the variable frequency fan 400 is expressed as:

[0068] Start the variable frequency fan 400 and adjust the power of the variable frequency fan 400 according to the total air volume output by the variable frequency fan 400;

[0069] Adjust the flow control valves of all branch pipes 320 to the maximum opening (i.e., 100% open);

[0070] In step S303, when the temperature measurement data at all control areas of the side wall 110 of the aluminum electrolysis cell are higher than the upper temperature limit, the variable frequency fan 400 is started and adjusted to the maximum power, and the flow regulating valves of all branch pipes 320 are adjusted to the maximum opening.

[0071] In step S304, when the temperature measurement data at one or more control areas of the side wall 110 of the aluminum electrolysis cell 100 is higher than the upper temperature limit, and the temperature measurement data at the remaining control areas is between the upper and lower temperature limits, the variable frequency fan 400 is started and adjusted to its maximum power. The flow regulating valve of the branch pipe 320 corresponding to the control area where the temperature measurement data is higher than the upper temperature limit is adjusted to its maximum opening. The opening of the flow regulating valve of the remaining branch pipe 320 is adjusted according to the following calculation results, wherein the opening of the flow regulating valve of the remaining branch pipe 320 is expressed as:

[0072] Among them, P i T represents the opening degree of the flow control valve in the i-th branch pipe 320. i This represents the temperature measurement data of the i-th control zone of the tank shell sidewall 110 of the aluminum electrolysis cell 100;

[0073] In step S305, when the temperature measurement data at one or more control areas of the side wall 110 of the aluminum electrolysis cell 100 is lower than the lower limit, and the temperature measurement data at the remaining control areas is between the upper and lower limits, the airflow output by the heat flow regulating device 200 corresponding to the control area where the temperature measurement data is between the upper and lower limits is calculated. The airflow output by the heat flow regulating device 200 is expressed as:

[0074] Among them, V i T represents the airflow output by the i-th heat flow regulating device 200. i This represents the temperature measurement data of the i-th control zone of the side wall 110 of the aluminum electrolysis cell 100. The temperature design value of the tank shell sidewall 110 of the aluminum electrolysis cell 100 is represented by a, b, and c, which are solutions to the following system of equations, where n is the number of control zones of the tank shell sidewall 110 of the aluminum electrolysis cell 100:

[0075] The specific solution formula is as follows:

[0076] The total air volume output by the variable frequency fan 400 is the sum of the air volumes output by the heat flow regulating device 200 corresponding to the control zone where the temperature measurement data is between the upper and lower temperature limits. The total air volume output by the variable frequency fan 400 is expressed as:

[0077] Start the variable frequency fan 400 and adjust the power of the variable frequency fan 400 according to the total air volume output by the variable frequency fan 400;

[0078] The flow control valves of branch pipes 320 corresponding to the control zone where the temperature measurement data is below the lower limit are closed. The opening degrees of the flow control valves of the remaining branch pipes 320 are adjusted according to the following calculation results, whereby the opening degrees of the flow control valves of the remaining branch pipes 320 are expressed as follows:

[0079] Among them, P i T represents the opening degree of the flow control valve in the i-th branch pipe 320. i This represents the temperature measurement data of the i-th control zone of the tank shell sidewall 110 of the aluminum electrolysis cell 100;

[0080] In step S306, when the temperature measurement data at one or more control areas of the side wall 110 of the aluminum electrolysis cell 100 is lower than the lower limit, the temperature measurement data at one or more control areas is higher than the upper limit, and the temperature measurement data at the remaining control areas is between the upper and lower limits, the variable frequency fan 400 is started and adjusted to its maximum power. The flow regulating valve of the branch pipe 320 corresponding to the control area where the temperature measurement data is lower than the lower limit is closed, and the flow regulating valve of the branch pipe 320 corresponding to the control area where the temperature measurement data is higher than the upper limit is adjusted to its maximum opening. The opening of the flow regulating valves of the remaining branch pipes 320 is adjusted according to the following calculation results, whereby the opening of the flow regulating valves of the remaining branch pipes 320 is expressed as follows:

[0081] Among them, P i T represents the opening degree of the flow control valve in the i-th branch pipe 320. i This represents the temperature measurement data of the i-th control zone of the tank shell sidewall 110 of the aluminum electrolysis cell 100;

[0082] In step S307, when the temperature measurement data at one or more control areas of the side wall 110 of the aluminum electrolysis cell 100 is higher than the upper temperature limit, and the temperature measurement data at the other control areas is lower than the lower temperature limit, the variable frequency fan 400 is started and adjusted to the maximum power, the flow regulating valve of the branch pipe 320 corresponding to the control area where the temperature measurement data is higher than the upper temperature limit is adjusted to the maximum opening, and the flow regulating valve of the other branch pipe 320 is closed.

[0083] The present invention also provides the following technical solutions.

[0084] Technical Solution 1. A thermal balance adjustment device for an aluminum electrolytic cell, characterized in that it comprises an aluminum electrolytic cell, a heat flow adjustment device, an air supply duct, a variable frequency fan, an air path control system, and a temperature measuring device. The heat flow adjustment device is disposed outside the side wall of the aluminum electrolytic cell shell and is connected to the variable frequency fan through the air supply duct. The temperature measuring device is disposed on the side wall of the aluminum electrolytic cell shell and is connected to the air path control system. The air path control system adjusts the air volume of the variable frequency fan and the opening degree of the flow valve in the air supply duct according to the measurement data of the temperature measuring device, thereby controlling the heat dissipation of the side of the electrolytic cell shell in different zones.

[0085] Technical Solution 2. A thermal balance adjustment device for an aluminum electrolytic cell according to Technical Solution 1, characterized in that: a plurality of cradle ribs are provided on the side wall of the aluminum electrolytic cell shell, and the side wall of the cell shell is divided into a plurality of independent control zones by the cradle ribs, and one or more heat flow adjustment devices are fixedly installed in each control zone.

[0086] Technical Solution 3. A heat balance regulating device for an aluminum electrolytic cell according to Technical Solution 1 or 2, characterized in that: the heat flow regulating device includes a vent plate, a jet tube array, and an outer shell; the vent plate is arranged parallel to the side wall of the aluminum electrolytic cell shell; multiple exhaust holes are arrayed on the vent plate; the jet tube array consists of multiple jet tube arrays; the air outlets of the jet tubes pass through the outer shell and the vent plate respectively, and are fixed within a control zone by the outer shell; the air outlets of the jet tubes face the side wall of the aluminum electrolytic cell shell.

[0087] Technical Solution 4. A thermal balance adjustment device for an aluminum electrolysis cell according to Technical Solution 3, characterized in that: the distance between the air outlet of the jet pipe and the side wall of the aluminum electrolysis cell shell is the same as the diameter distance of the air outlet of the jet pipe; the diameter distance of the exhaust hole is greater than the distance between two adjacent jet pipes.

[0088] Technical Solution 5. A thermal balance regulating device for an aluminum electrolytic cell according to Technical Solution 3, characterized in that: the air supply pipeline includes a main pipeline and branch pipelines, the main pipeline is connected to a variable frequency fan, the main pipeline is provided with multiple branch pipelines, the branch pipelines are connected to a jet tube array, and each branch pipeline is provided with a flow regulating valve.

[0089] Technical Solution 6. The adjustment method of the aluminum electrolytic cell heat balance adjustment device according to any one of Technical Solutions 1-5, characterized by comprising the following steps:

[0090] S1. Obtain the temperature of the side wall of the aluminum electrolysis cell shell through a temperature measuring device;

[0091] S2. Set the upper and lower limits of the sidewall temperature of the aluminum electrolysis cell shell as constraints.

[0092] S3. Based on the data obtained from the temperature measuring device, the air circuit control system controls the air volume of the variable frequency fan and the opening degree of the branch pipe flow regulating valve respectively.

[0093] Technical Solution 7. The adjustment method of the aluminum electrolytic cell heat balance adjustment device according to Technical Solution 6, characterized in that, step S3 specifically comprises:

[0094] S301. When all temperature measuring points on the side wall of the aluminum electrolysis cell are below the lower limit of the reference, the variable frequency fan is turned off, and the heat flow regulating device itself is used to achieve the heat preservation of the side wall of the aluminum electrolysis cell.

[0095] S302. When all temperature measuring points on the side wall of the aluminum electrolysis cell are between the upper and lower limits of the reference, start the variable frequency fan and adjust the air volume. Based on the temperature data of the side wall of the cell, establish the characteristic equation of the output air volume of each heat flow regulating device using the principle of multiple linear regression. The output air volume of a single heat flow regulating device is expressed as:

[0096] Among them, V i T represents the air volume output by the i-th heat flow regulating device. i This represents the temperature of the side wall of the aluminum electrolysis cell shell in the i-th control zone. This represents the design temperature value of the sidewall of the aluminum electrolysis cell shell, where a, b, and c are respectively V i T i , The undetermined coefficients;

[0097] The total air volume output by the variable frequency fan is the sum of the air volumes output by each heat flow regulating device. The total air volume output by the fan is expressed as:

[0098] The power of the variable frequency fan is adjusted accordingly based on the total air volume output by the fan;

[0099] S303. When all temperature measuring points on the side wall of the aluminum electrolysis cell are higher than the upper limit of the reference, start the variable frequency fan and adjust it to the maximum power, and adjust the branch pipeline flow regulating valve to the maximum opening.

[0100] S304. When the temperature at one or more measuring points on the side wall of the aluminum electrolysis cell exceeds the upper limit of the reference range, while the temperatures at the remaining measuring points are between the upper and lower limits, start the variable frequency fan and adjust its power. Adjust the flow control valve of the branch pipe corresponding to the measuring point exceeding the upper limit of the reference range to its maximum opening. The opening of the flow control valves of the remaining branch pipes is adjusted according to the calculation results. The opening of the flow control valves of the remaining branch pipes is expressed as follows:

[0101] Among them, P y T represents the opening degree of the flow regulating valve in the y-th branch pipe. iThis represents the temperature of the side wall of the i-th control zone of the aluminum electrolysis cell. T represents the design temperature value of the side wall of the aluminum electrolysis cell shell. max This represents the highest temperature on the side wall of the aluminum electrolysis cell shell, where h is a correction factor.

[0102] S305. When the temperature of only one or a few temperature measuring points on the side wall of the aluminum electrolysis cell is lower than the lower limit of the benchmark, start the variable frequency fan and adjust its power, close the flow regulating valve of the branch pipe corresponding to the temperature measuring point that is lower than the upper limit of the benchmark, and adjust the opening of the flow regulating valve of the remaining branch pipes according to the calculation results.

[0103] This invention, by setting a heat flow regulating device in the control area between adjacent cradle ribs, can adjust the heat dissipation based on the temperature measurement data of each control area of ​​the cradle shell sidewall; when the device is not in operation, it can achieve external heat insulation of the cradle shell sidewall; when the device is in operation, it can quantitatively adjust the heat dissipation of the cradle shell sidewall; the heat flow regulating device, in conjunction with the air circuit control system, can achieve zoned control of the heat dissipation of the cradle shell sidewall.

[0104] The present invention has a simple structure and the overall device can be customized in terms of adjustment capability and appearance size according to the production conditions and design specifications of the electrolytic cell, making it highly applicable.

[0105] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning of the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the claims should be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the invention.

[0106] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from the spirit and scope of this invention; thus, if these modifications and variations of this invention fall within the scope of the claims of this invention and their equivalents.

Claims

1. A thermal balance adjusting device for an aluminum electrolytic cell, comprising an aluminum electrolytic cell (100), a plurality of heat flow adjusting devices (200), an air supply pipeline (300), a variable frequency fan (400), an air path control system (500), and a temperature measuring device (600), wherein, The side wall (110) of the cell shell of the aluminum electrolysis cell (100) comprises a plurality of control areas, a plurality of heat flow adjusting devices (200) are arranged outside the side wall (110) of the cell shell of the aluminum electrolysis cell (100), each heat flow adjusting device (200) of the plurality of heat flow adjusting devices (200) is configured to adjust the air volume output to a corresponding control area of the plurality of control areas, the air supply pipeline (300) comprises a main pipeline connected with the variable frequency fan (400), a plurality of branch pipelines (320) are arranged on the main pipeline, each branch pipeline of the plurality of branch pipelines (320) is connected with a corresponding heat flow adjusting device of the plurality of heat flow adjusting devices (200), a flow regulating valve is arranged on each branch pipeline (320), the temperature measuring device (600) is arranged on the side wall (110) of the cell shell of the aluminum electrolysis cell (100) to obtain temperature measurement data of the plurality of control areas of the side wall (110) of the cell shell of the aluminum electrolysis cell (100), the temperature measuring device (600) is connected with the air path control system (500), the air path control system (500) is electrically connected with the variable frequency fan (400) and the flow regulating valve, the air path control system (500) adjusts the air volume of the variable frequency fan (400) and the flow distribution in the air supply pipeline (300) according to the temperature measurement data obtained by the temperature measuring device (600), so as to control and adjust the heat dissipation of the side wall (110) of the cell shell of the aluminum electrolysis cell (100) in a partitioned manner.

2. The aluminium electrolytic cell heat balance regulating device according to claim 1, wherein, The side wall (110) of the cell shell of the aluminum electrolysis cell (100) is provided with a plurality of rib plates (120), and the side wall (110) of the cell shell is divided into a plurality of control areas by the plurality of rib plates (120).

3. The aluminum electrolytic cell heat balance adjustment apparatus of claim 1 wherein, Each heat flow adjusting device (200) is arranged near a corresponding control area.

4. The aluminum electrolytic cell heat balance adjustment apparatus of claim 1 wherein, One or more temperature measuring points are arranged in each control area.

5. The aluminum electrolytic cell heat balance adjustment apparatus of claim 1 wherein, Each heat flow adjusting device (200) comprises a gas permeable plate (220), a jet pipe array (210) and an outer shell (230), the gas permeable plate (220) is arranged in parallel with the side wall (110) of the cell shell of the aluminum electrolysis cell (100), the gas permeable plate (220) comprises a plurality of exhaust holes, the jet pipe array (210) comprises an array composed of a plurality of jet pipes, the air outlets of the jet pipe array (210) respectively pass through the outer shell (230) and the gas permeable plate (220), each branch pipeline (320) is connected with the jet pipe array (210) of the corresponding heat flow adjusting device (200), and the air outlets of the jet pipe array (210) are directed towards the side wall (110) of the cell shell of the aluminum electrolysis cell (100).

6. The aluminium electrolytic cell heat balance regulating device according to claim 5, wherein, The plurality of exhaust holes of the gas permeable plate (220) are arranged in a square array, and the ratio of the distance between the centers of two adjacent exhaust holes to the diameter of each exhaust hole is 1.2-1.

6.

7. A regulating method using the aluminum electrolysis cell heat balance adjusting device according to any one of claims 1-6, comprising the following steps: (S1) obtaining temperature measurement data at the plurality of control regions of the side wall of the pot shell of the aluminum electrolysis cell by the temperature measurement device; (S2) setting an upper temperature limit T of the sidewall of the cell housing of the aluminium electrolytic cell max with a lower temperature limit T min ; and (S3) controlling the air volume of the variable frequency fan and the opening of the flow regulating valve of the branch pipe by the air path control system according to the temperature measurement data obtained by the temperature measurement device.

8. The method of claim 7, wherein, The step (S3) comprises: (S301) when the temperature measurement data at all control areas of the cell shell sidewall of the aluminum electrolysis cell are lower than the temperature lower limit T min , the frequency conversion fan is turned off, and the heat preservation of the cell shell sidewall of the aluminum electrolysis cell is realized by the structure of the hot air flow adjusting device itself. (S302) when the temperature measurement data at all control regions of the cell shell sidewall of the aluminum electrolytic cell are between the temperature upper limit T max and the temperature lower limit T min , the air volume output by each heat flow adjusting device is calculated, which is expressed as: wherein V i represents the air volume outputted by the i-th heat flow regulating device, T i represents the temperature measurement data of the i-th control area of the sidewall of the cell shell of the aluminum reduction cell, represents a temperature design value of the cell shell sidewall of the aluminum electrolytic cell, a, b, and c are solutions of the following equation group, where n is the number of control regions of the cell shell sidewall 110 of the aluminum electrolytic cell 100: The specific solution formula is as follows: The total air volume outputted by the variable frequency fan is the sum of the air volume outputted by all the thermal flow adjusting devices, and the total air volume outputted by the variable frequency fan is represented as: starting the variable frequency fan and adjusting the power of the variable frequency fan according to the total air volume output by the variable frequency fan; adjusting the flow regulating valves of all branch pipes to the maximum opening; (S303) when the temperature measurement data at all control regions of the side wall of the pot shell of the aluminum electrolysis cell are higher than the upper temperature limit, starting the variable frequency fan and adjusting the variable frequency fan to the maximum power, and adjusting the flow regulating valves of all branch pipes to the maximum opening; (S304) When the temperature measurement data at one or more control areas of the sidewall of the cell shell of the aluminum electrolysis cell is higher than the upper temperature limit, and the temperature measurement data at the remaining control areas is between the upper temperature limit and the lower temperature limit, the variable frequency fan is started and adjusted to maximum power, the flow regulating valve of the branch corresponding to the control area with temperature measurement data higher than the upper temperature limit is adjusted to maximum opening, and the opening of the flow regulating valve of the remaining branches is adjusted according to the following calculation result, and the opening of the flow regulating valve of the remaining branches is represented as: wherein P i represents the opening degree of the flow regulating valve of the i-th branch pipe, T i represents the temperature measurement data of the i-th control region of the side wall of the cell shell of the aluminum electrolysis cell; (S305) When the temperature measurement data at one or more control regions of the cell shell sidewall of the aluminum electrolytic cell is lower than the lower temperature limit, and the temperature measurement data at the remaining control regions is between the upper temperature limit and the lower temperature limit, the air volume output by the heat flow adjusting device corresponding to the control region with the temperature measurement data between the upper temperature limit and the lower temperature limit is calculated, and the air volume output by the heat flow adjusting device is represented as: wherein V i represents the air volume outputted by the i-th heat flow regulating device, T i represents the temperature measurement data of the i-th control area of the sidewall of the cell shell of the aluminum reduction cell, represents a temperature design value of the cell shell sidewall of the aluminum electrolytic cell, a, b, and c are solutions of the following equation set, where n is a number of control regions of the cell shell sidewall of the aluminum electrolytic cell: The specific solution formula is as follows: The total air volume output by the variable frequency fan is the sum of the air volume output by the heat flow regulating device corresponding to the control region in which the temperature measurement data is between the upper temperature limit and the lower temperature limit, and the total air volume output by the variable frequency fan is expressed as: starting the variable frequency fan and adjusting the power of the variable frequency fan according to the total air volume output by the variable frequency fan; The flow regulating valve of the branch corresponding to the control region in which the temperature measurement data is below the lower temperature limit is closed, and the opening of the flow regulating valves of the remaining branches is adjusted according to the following calculation result, which is expressed as: wherein P i represents the opening degree of the flow regulating valve of the i-th branch pipe, T i represents the temperature measurement data of the i-th control region of the side wall of the cell shell of the aluminum electrolysis cell; (S306) When the temperature measurement data at one or more control regions of the cell shell sidewall of the aluminum electrolysis cell is lower than the lower temperature limit, the temperature measurement data at one or more control regions is higher than the upper temperature limit, and the temperature measurement data at the remaining control regions is between the upper temperature limit and the lower temperature limit, start the variable frequency fan and adjust the variable frequency fan to maximum power, close the flow regulating valve of the branch pipe corresponding to the control region whose temperature measurement data is lower than the lower temperature limit, adjust the flow regulating valve of the branch pipe corresponding to the control region whose temperature measurement data is higher than the upper temperature limit to maximum opening, and adjust the opening of the flow regulating valve of the remaining branch pipes according to the following calculation results, the opening of the flow regulating valve of the remaining branch pipes is expressed as: wherein P i represents the opening degree of the flow regulating valve of the i-th branch pipe, T i represents the temperature measurement data of the i-th control region of the side wall of the cell shell of the aluminum electrolysis cell; (S307) when the temperature measurement data at one or more control regions of the side wall of the pot shell of the aluminum electrolysis cell are higher than the upper temperature limit, and the temperature measurement data at the remaining control regions are lower than the lower temperature limit, starting the variable frequency fan and adjusting the variable frequency fan to the maximum power, adjusting the flow regulating valve of the branch pipe corresponding to the control region with the temperature measurement data higher than the upper temperature limit to the maximum opening, and closing the flow regulating valves of the remaining branch pipes.

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