Heat balance adjusting device for aluminum electrolysis cell

Abstract

The utility model relates to the technical field of aluminum electrolysis, and discloses an aluminum electrolysis cell heat balance adjusting device which comprises an aluminum electrolysis cell, a heat flow adjusting device, an air supply pipeline, a frequency conversion fan, a gas circuit control system and a temperature measuring device. The heat flow adjusting device is connected with the variable-frequency fan through an air supply pipeline; the temperature measuring device is arranged on the side wall of the cell shell of the aluminum electrolysis cell and is connected with the gas path control system; the air path control system adjusts the air volume of the frequency conversion fan and the opening degree of the flow valve in the air supply pipeline according to measured data of the temperature measuring device, and the heat dissipating capacity of the side portion of the electrolytic cell shell is controlled in a zoning mode. According to the utility model, the heat flow adjusting device is arranged in the space between the adjacent cradle rib plates, so that the heat dissipating capacity can be adjusted according to the temperature of the side wall of the bath shell; when the device does not operate, external thermal insulation of the side wall of the tank shell can be realized; when the device runs, the heat dissipating capacity of the side wall of the tank shell can be quantitatively adjusted.

Description

Technical Field

[0001] The utility model relates to the technical field of aluminum electrolysis, in particular to a heat balance adjustment device for an aluminum electrolysis cell. Background Technique

[0002] At present, the electricity price in the domestic aluminum electrolysis industry accounts for about 40% of the production cost. The electricity cost to a certain extent determines the competitiveness of aluminum electrolysis enterprises. To reduce the production cost, relevant researchers have proposed that some new energy power can be connected to produce aluminum electrolysis, making the aluminum electrolysis cell a "virtual battery" for new energy power generation. Although this measure can greatly reduce the production cost of aluminum electrolysis, it poses an additional challenge to the aluminum electrolysis cell that operates stably for 24 hours.

[0003] The stable operation of the existing aluminum electrolysis cell needs to be maintained within a narrow "heat balance" range. If the aluminum electrolysis cell is to become a "virtual battery" for new energy power generation, additional adjustment measures are required to maintain the "heat balance". In particular, parts with a relatively large proportion of the total heat dissipation, such as the side wall of the cell shell, have become the "breakthrough point" of the adjustment measures.

[0004] Combined with the current form of the electrolysis cell and the actual production needs, it is very necessary to develop a heat balance adjustment device for an aluminum electrolysis cell with strong applicability and large adjustment ability. The previous devices for adjusting the heat dissipation of the side wall of the cell shell are as follows: Utility model patent CN111690952A, a flexible production device for an aluminum electrolysis cell, which adjusts the temperature of the cell shell through a blowing pipe on the side of the cell shell; Utility model patent CN117488367A, a flexible production energy regulation device for an aluminum electrolysis cell, which adjusts the heat dissipation by installing a heat exchange device on the outer wall of the cell shell of the aluminum electrolysis cell.

[0005] In summary, some devices can only increase the heat dissipation of the aluminum electrolysis cell and have no external heat preservation effect. Some devices have a too simple structure, fail to design the device from the theoretical perspective of convective heat transfer, and lack supporting control methods. Content of the Utility Model

[0006] In view of the above-mentioned disadvantages and deficiencies, the utility model provides a heat balance adjustment device for an aluminum electrolysis cell, which can adjust the heat dissipation according to the temperature of the side wall of the cell shell of the aluminum electrolysis cell, so that the electrolysis cell can maintain stable production under the condition of power fluctuation of green energy power generation.

[0007] To achieve the above purpose, the main technical solutions adopted by the utility model are:

[0008] A heat balance adjustment device for an aluminum electrolysis cell, comprising an aluminum electrolysis cell, a heat flow adjustment device, a blast air pipeline, a variable frequency fan, a gas pipeline control system and a temperature measurement device. The heat flow adjustment device is arranged outside the side wall of the cell shell of the aluminum electrolysis cell. The heat flow adjustment device is connected to the variable frequency fan through the blast air pipeline. The temperature measurement device is arranged on the side wall of the cell shell of the aluminum electrolysis cell. The temperature measurement device is connected to the gas pipeline control system. The gas pipeline control system adjusts the air volume of the variable frequency fan and the opening degree of the flow valve in the blast air pipeline according to the measurement data of the temperature measurement device, and controls the heat dissipation amount of the side part of the electrolysis cell shell in zones.

[0009] A plurality of cradle stiffeners are arranged on the side wall of the cell shell of the aluminum electrolysis cell. The side wall of the cell shell is divided into a plurality of independent control zones through the cradle stiffeners. One or more heat flow adjustment devices are fixedly arranged in each control zone.

[0010] The heat flow adjustment device comprises a ventilation plate, a jet tube array and an outer shell body. The ventilation plate is arranged parallel to the side wall of the cell shell of the aluminum electrolysis cell. A plurality of exhaust holes are arranged in an array on the ventilation plate. The jet tube array is composed of a plurality of jet tubes arranged in an array. The air outlets of the jet tubes respectively pass through the outer shell body and the ventilation plate, and are fixed in a control zone through the outer shell body. The air outlets of the jet tubes face the side wall of the cell shell of the aluminum electrolysis cell.

[0011] The distance between the air outlet of the jet tube and the side wall of the cell shell of the aluminum electrolysis cell is the same as the distance between the diameter of the air outlet of the jet tube. The diameter distance of the exhaust holes is greater than the distance between two adjacent jet tubes.

[0012] The blast air pipeline comprises a main pipeline and branch pipelines. The main pipeline is connected to the variable frequency fan. A plurality of branch pipelines are arranged on the main pipeline. The branch pipelines are connected to the jet tube array. A flow regulating valve is arranged on each branch pipeline.

[0013] The utility model has the following beneficial effects and advantages:

[0014] 1. By arranging the heat flow adjustment device in the space between adjacent cradle stiffeners, the utility model can adjust the heat dissipation amount according to the temperature of the side wall of the cell shell. When the device does not operate, external heat insulation of the side wall of the cell shell can be realized. When the device operates, the heat dissipation amount of the side wall of the cell shell can be adjusted quantitatively.

[0015] 2. The heat flow adjustment device of the utility model is matched with the gas pipeline control system, and the heat dissipation amount of the side wall of the cell shell can be controlled in zones.

[0016] 3. The structure of the utility model is simple. The adjustment ability and appearance size of the whole device can be customized according to the production situation and design specifications of the electrolysis cell, and the applicability is strong. Description of the Drawings

[0017] Figure 1 is the flow chart of the heat balance adjustment device for the aluminum electrolysis cell of the utility model;

[0018] Figure 2 is the front view schematic diagram of the device structure of the present utility model;

[0019] Figure 3 is the schematic diagram of the structure of the heat flow regulating device of the present utility model;

[0020] Figure 4 is the schematic diagram of the installation position of the heat flow regulating device of the present utility model;

[0021] Figure 5 is the schematic flow diagram of the method for the heat balance regulating device of the aluminum electrolytic cell using the present utility model.

[0022] In the figure: 100, aluminum electrolytic cell; 110, side wall of the cell shell; 120, cradle rib plate; 200, heat flow regulating device; 210, jet tube array; 220, air-permeable plate; 230, outer shell; 300, air supply pipeline; 310, main pipeline; 320, branch pipeline; 321, flow regulating valve; 400, variable frequency fan; 500, gas path control system; 600, temperature measuring device. Specific embodiments

[0023] The present utility model will be further described below in conjunction with the accompanying drawings of the specification. As Figures 1-2 shown, the present utility model is a heat balance regulating device for an aluminum electrolytic cell, including an aluminum electrolytic cell 100, a heat flow regulating device 200, an air supply pipeline 300, a variable frequency fan 400, a gas path control system 500, and a temperature measuring device 600. The heat flow regulating device 200 is arranged outside the side wall 110 of the cell shell of the aluminum electrolytic cell, and the heat flow regulating device 200 is connected to the variable frequency fan 400 through the air supply pipeline 300; the temperature measuring device 600 is arranged on the side wall 110 of the cell shell of the aluminum electrolytic cell, and the temperature measuring device 600 is connected to the gas path control system 500; the gas 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 measurement data of the temperature measuring device 600, and controls the heat dissipation of the side part of the cell shell of the electrolytic cell in zones.

[0024] As Figure 4 shown, a plurality of cradle rib plates 120 are arranged on the side wall of the cell shell of the aluminum electrolytic cell, and the side wall 110 of the cell shell is divided into a plurality of independent control zones through the cradle rib plates 120, and one or more heat flow regulating devices 200 are fixedly arranged in each control zone.

[0025] As Figure 3As shown in the figure, the heat flow regulating device 200 includes a ventilation plate 220, a jet tube array 210, and a housing 230. The ventilation plate 220 is arranged parallel to the side wall 110 of the cell shell of the aluminum electrolytic cell. A plurality of exhaust holes are arranged in an array on the ventilation plate 220. The jet tube array 210 is composed of a plurality of jet tubes arranged in an array. The air outlets of the jet tubes pass through the housing 230 and the ventilation plate 220 respectively, and are fixed in a control area through the housing 230, which can reduce the convective and radiative heat transfer of the cell shell to the outside.

[0026] The air outlets of the jet tubes face the side wall 110 of the cell shell of the aluminum electrolytic cell. The exhaust holes are distributed above the edge of the jet transition area. The exhaust holes are arranged in a square array. The diameter of the exhaust holes is d. The center distance between the two exhaust pipes is 2D. The center of the square array of the exhaust holes is the outlet of the jet tube. The ratio of D to d is 0.6 - 0.8. The housing 230 is used to fix the jet tube array 210 and the ventilation plate 220 in the control area, which can reduce the convective and radiative heat transfer of the cell shell to the outside.

[0027] The air supply pipeline 300 includes a main pipeline 310 and branch pipelines 320. The main pipeline 310 is connected to a variable frequency fan 400. A plurality of branch pipelines 320 are provided on the main pipeline 320. The branch pipelines 320 are connected to the jet tube array 210. A flow regulating valve is provided on each branch pipeline 320.

[0028] The temperature measuring device 600 is arranged on the side wall 110 of the electrolytic cell shell for measuring the temperature of the side wall 110 of the electrolytic cell shell.

[0029] The gas path control system 500 is electrically connected to the variable frequency fan 400 and the flow regulating valves of the branch pipelines of the air supply pipeline. The gas path control system 500 adjusts the power of the variable frequency fan 400 and the flow distribution in the air supply pipeline 300 according to the temperature data output by the temperature measuring device 600, and adjusts the heat dissipation of the side wall 110 of the electrolytic cell shell in zones.

[0030] As Figure 5 shown, specifically, the adjustment method of the aluminum electrolytic cell heat balance regulating device of the present invention can be adopted, which is characterized by including the following steps:

[0031] S1. Obtain the temperature of the side wall 110 of the aluminum electrolytic cell shell through the temperature measuring device;

[0032] S2. Set the upper temperature limit and the lower temperature limit of the side wall 110 of the aluminum electrolytic cell shell as constraint conditions;

[0033] S3. According to the data obtained by the temperature measuring device 600, the gas path control system 500 controls the air volume of the variable frequency fan 400 and the opening degree of the flow regulating valves of the branch pipelines 320 respectively.

[0034] The specific content of S3 is:

[0035] S301. When the temperature of the side wall 110 of the aluminum electrolysis cell shell is lower than the lower reference limit, turn off the variable-frequency fan 400, and the structure of the heat flow regulating device 200 itself realizes the heat preservation of the side wall 110 of the aluminum electrolysis cell shell;

[0036] S302. When the temperature of the side wall 110 of the aluminum electrolysis cell shell is between the upper and lower reference limits, start the variable-frequency fan 400 and adjust the air volume. According to the temperature data of the side wall 110 of the cell shell, use the principle of multiple linear regression to establish the characteristic equation of the air volume output by each heat flow regulating device 200. The air volume output by the single heat flow regulating device is expressed as:

[0037]

[0038] Where, V i represents the air volume output by the i-th heat flow regulating device, and T i represents the temperature of the side wall of the aluminum electrolysis cell shell in the i-th control interval, represents the designed temperature value of the side wall of the aluminum electrolysis cell shell, and a, b, and c are the undetermined coefficients of Vi, Ti, respectively;

[0039] 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:

[0040]

[0041] The power of the variable-frequency fan is adjusted accordingly according to the total air volume output by the fan;

[0042] S303. When the temperatures of the side walls 110 of the aluminum electrolysis cell shell are all higher than the upper reference limit, start the variable-frequency fan and adjust it to the maximum power, and adjust the flow regulating valve of the branch pipeline to the maximum opening;

[0043] S304. When the temperature of one or several places of the side wall 110 of the aluminum electrolysis cell shell is higher than the upper reference limit, and the temperatures of the other temperature measurement points are between the upper and lower limits, start the variable-frequency fan and adjust the power. Adjust the flow regulating valve of the branch pipeline corresponding to the point higher than the upper reference limit to the maximum opening, and adjust the opening of the other branch pipeline flow regulating valves according to the calculation results. The opening of the other branch pipeline flow regulating valves is expressed as:

[0044]

[0045] Where, P y represents the opening of the y-th branch pipeline flow regulating valve, and T i represents the temperature of the side wall of the aluminum electrolysis cell shell in the i-th control area, represents the designed temperature value of the side wall of the aluminum electrolysis cell shell, and T max represents the highest temperature of the side wall of the aluminum electrolysis cell shell, and h is a correction coefficient;

[0046] S305. When the temperature of the side wall of the aluminum electrolysis cell shell is lower than the reference lower limit at only one or several places, start the variable-frequency fan and adjust the power, close the flow regulating valve of the branch pipeline corresponding to the point lower than the reference upper limit, and adjust the opening degrees of the flow regulating valves of the remaining branch pipelines according to the calculation results.

[0047] By arranging a heat flow regulating device in the space between adjacent cradle stiffeners, the present utility model can adjust the heat dissipation amount according to the temperature of the side wall of the cell shell; when the device is not operating, external heat insulation of the side wall of the cell shell can be achieved; when the device is operating, the heat dissipation amount of the side wall of the cell shell can be adjusted quantitatively; by cooperating with the gas circuit control system, the heat dissipation amount of the side wall of the cell shell can be controlled in zones.

[0048] The structure of the present utility model is simple, and the adjustment ability and appearance size of the overall device can be customized according to the production situation and design specifications of the electrolysis cell, with strong applicability.

[0049] Although the preferred embodiments of the present utility model have been described, those skilled in the art can make additional changes and modifications to these embodiments after learning the basic creative concepts. Therefore, the claims should be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the present utility model.

[0050] Obviously, those skilled in the art can make various modifications and variations to the present utility model without departing from the spirit and scope of the present utility model; thus, if these modifications and variations of the present utility model fall within the scope of the claims of the present utility model and their equivalent technologies.

Claims

1. A thermal balance adjustment device for an aluminum electrolysis cell, characterized in that: It includes an aluminum electrolysis cell, a heat flux regulating device, a blast air pipeline, a variable-frequency blower, a gas pipeline control system, and a temperature measuring device. The heat flux regulating device is arranged outside the side wall of the cell shell of the aluminum electrolysis cell. The heat flux regulating device is connected to the variable-frequency blower through the blast air pipeline. The temperature measuring device is arranged on the side wall of the cell shell of the aluminum electrolysis cell. The temperature measuring device is connected to the gas pipeline control system. The gas pipeline control system adjusts the air volume of the variable-frequency blower and the opening degree of the flow valve in the blast air pipeline according to the measurement data of the temperature measuring device, and controls the heat dissipation amount of the side part of the electrolysis cell shell in a zoning manner.

2. The thermal balance adjustment device for an aluminum electrolytic cell according to claim 1, characterized in that: A plurality of cradle stiffeners are arranged on the side wall of the cell shell of the aluminum electrolysis cell. The side wall of the cell shell is divided into a plurality of independent control zones through the cradle stiffeners. One or more heat flux regulating devices are fixedly arranged in each control zone.

3. The thermal balance adjustment device for an aluminum electrolytic cell according to claim 1 or 2, characterized in that: The heat flux regulating device includes a breathable plate, a jet tube array, and an outer shell. The breathable plate is arranged parallel to the side wall of the cell shell of the aluminum electrolysis cell. A plurality of exhaust holes are arranged in an array on the breathable plate. The jet tube array is composed of a plurality of jet tubes arranged in an array. The air outlets of the jet tubes pass through the outer shell and the breathable plate respectively, and are fixed in a control zone through the outer shell. The air outlets of the jet tubes face the side wall of the cell shell of the aluminum electrolysis cell.

4. The thermal balance adjustment device for an aluminum electrolytic cell according to claim 3, characterized in that: The distance between the air outlet of the jet tube and the side wall of the cell shell of the aluminum electrolysis cell is the same as the diameter distance of the air outlet of the jet tube. The diameter distance of the exhaust hole is greater than the distance between two adjacent jet tubes.

5. The thermal balance adjustment device for an aluminum electrolytic cell according to claim 3, wherein: The blast air pipeline includes a main pipeline and branch pipelines. The main pipeline is connected to the variable-frequency blower. A plurality of branch pipelines are arranged on the main pipeline. The branch pipelines are connected to the jet tube array. A flow regulating valve is arranged on each branch pipeline.

Images