Method for optimizing magnetic field of aluminum electrolysis cell without compensation bus

Abstract

The invention discloses a method for optimizing a magnetic field of an aluminum electrolysis cell without a compensation bus, and belongs to the technical field of metal aluminum electrolysis. The method is characterized in that a permanent magnet external compensation system is adopted to replace an external compensation bus system for overall optimization of the magnetic field in the aluminum electrolysis cell. An annular track is arranged around an aluminum electrolysis cell, a permanent magnet external compensation device is erected on the track to form an electrolysis cell permanent magnet compensation system, the magnetic field intensity and direction generated by each compensation device in the permanent magnet compensation system are controlled to form directional magnetic reconnection with a magnetic field in the electrolysis cell, and optimization of the overall magnetic field in the electrolysis cell is achieved. Traditional electromagnetic compensation is completely replaced by permanent magnet compensation, and the design concept of an existing aluminum electrolysis cell compensation bus is changed. The design of the electrolytic cell is simplified, and the magnetic fluid stability investment and operation cost of the aluminum electrolytic cell are greatly reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of metal aluminum electrolysis and discloses a magnetic field optimization method for an aluminum electrolysis cell without a compensation bus. Background Art

[0002] Improving the stability of magnetic fluid in the aluminum electrolysis process is crucial to reducing the cell voltage, improving the current efficiency, and ensuring the long-term stable operation of the electrolytic cell. The busbar structure, cathode structure, and electrolytic cell structure design are currently the main means of optimizing the overall magnetic field in the cell.

[0003] For example, CN201010158476.X discloses a busbar configuration method for an aluminum electrolytic cell, in which the current flows out through the cathode soft busbar at the power-in side busbar, and then flows into the zigzag bottom busbar, the bottom running busbar, and the side busbar after passing through the power-in side cathode busbar; the current also flows out through the cathode soft busbar at the power-out side busbar, and then flows into the four column busbars of the downstream cell after passing through the cathode busbar on the power-out side. This not only achieves the magnetic field compensation effect, but also saves the amount of busbars around the cell. CN200810227123.3 discloses a busbar configuration structure for an aluminum electrolytic cell, in which part of the upstream cathode busbar passes from the bottom of the cell to the downstream side to become the bottom compensation busbar; part of the upstream cathode busbar bypasses from both ends of the cell to the downstream side to become the perimeter compensation busbar; this solves the electromagnetic disturbance problem between each cell and between the cell and the adjacent cell, making it easier to achieve the best magnetic field distribution and stability of the melt in the cell. CN200810227122.9 discloses an aluminum electrolytic cell busbar configuration structure including external compensation, wherein the external compensation method is to respectively set external compensation busbars along the series current direction at both ends of the existing aluminum electrolytic cell, and the current direction in the external compensation busbars is the same as the series current direction; multiple cathode busbars are set at the bottom of the cell along the series current direction, and the external compensation busbars and the bottom compensation busbars jointly correct and compensate the magnetic field disturbance of the aluminum electrolytic cell. The present invention solves the problem that the cathode busbar usage of each cell is extremely large and very complicated, and saves the busbar usage. CN200910013057.4 discloses a dry aluminum electrolytic cell, wherein a dark aluminum groove is provided between the cathode carbon blocks, and several grooves are opened at the same time. The large surface and the end of the electrolytic cell are also opened with grooves, and the grooves and the dark aluminum grooves are interconnected to realize the production without aluminum liquid between the electrodes. The magnetic field stability of the electrolytic cell is improved, the busbar design of the electrolytic cell is greatly simplified, and the busbar material usage is saved. CN201910344363.X discloses an electrolytic plant and electrolytic cell layout structure of an aluminum electrolytic cell series, in which a rectifier is set between or on one side of a rectangular electrolytic plant with a notch, and multiple electrolytic cells are arranged in sections while keeping the total length of the original plant unchanged, so that the vertical magnetic field Bz generated by the electrolytic current parallel to each electrolytic cell does not exceed a given value. However, with the large-scale electrolytic cells, existing methods all require the configuration of compensation busbars, and the magnetic field distribution in the cell is optimized by compensating the magnetic field generated by the busbars, which not only greatly increases the busbar usage, but also significantly increases the overall energy consumption of production due to the current idle consumption in the compensation busbars.

[0004] Developing a magnetic field optimization method for aluminum electrolysis cells without compensation busbars is crucial to the stable operation, cost reduction and energy saving of existing aluminum electrolysis cells and future large-scale aluminum electrolysis cells. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention provides a method for optimizing the magnetic field of an aluminum electrolytic cell without a compensation busbar. A circular track is arranged around the aluminum electrolytic cell, and a permanent magnetic external compensation device is set up on the track to form an electrolytic cell permanent magnetic compensation system. The magnetic field strength and direction generated by each compensation device in the permanent magnetic compensation system are controlled so that it forms a directional magnetic reconnection with the magnetic field in the electrolytic cell at different positions, thereby optimizing the overall magnetic field in the electrolytic cell.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A method for optimizing the magnetic field of an aluminum electrolytic cell without a compensation busbar is disclosed. A circular track is arranged around the aluminum electrolytic cell, and a permanent magnetic external compensation device is installed on the track to form a permanent magnetic compensation system for the electrolytic cell. The magnetic field strength and direction generated by each compensation device in the permanent magnetic compensation system are controlled so that the magnetic field is directional reconnected with the magnetic field in the electrolytic cell at different positions to correct and compensate for the magnetic field fluctuation in the aluminum electrolytic cell, thereby optimizing the overall magnetic field in the electrolytic cell and stabilizing the magnetic fluid.

[0008] Furthermore, the number of the permanent magnet external compensation devices constituting the system includes 1 or more;

[0009] Furthermore, the height adjustment range of the permanent magnetic external compensation device constituting the system is 10-1500mm;

[0010] Furthermore, the permanent magnetic external compensation device constituting the system is 10-400 mm away from the slot side wall;

[0011] Furthermore, the magnetic field strength of the permanent magnet in the permanent magnet external compensation device constituting the system is 100-50000Gs

[0012] Furthermore, the permanent magnetic external compensation device constituting the system can be moved freely on the entire circular track;

[0013] Furthermore, the permanent magnetic external compensation system generates a strong magnetic field through a series of permanent magnetic external compensation devices installed on the circular track, so that it forms directional magnetic reconnection with the magnetic field in the electrolytic cell at different positions, corrects and compensates for the magnetic field fluctuation in the aluminum electrolytic cell, optimizes the overall magnetic field in the electrolytic cell, meets the requirements of the aluminum electrolytic cell, especially the large aluminum electrolytic cell, for magnetic field stability, and changes the existing aluminum electrolytic cell compensation busbar design concept. It greatly reduces the investment and operation cost of the aluminum electrolytic cell magnetic fluid stability.

[0014] The method for optimizing the magnetic field of an aluminum electrolytic cell without a compensation busbar of the present invention has the following advantages:

[0015] 1. The present invention is a method for optimizing the magnetic field of an aluminum electrolysis cell without a compensation busbar. The external compensation method of the present invention is permanent magnet compensation. A permanent magnet external compensation system is used to replace the external compensation busbar system to optimize the overall magnetic field in the aluminum electrolysis cell, thereby greatly reducing the investment in magnetic fluid stability and operating costs of the aluminum electrolysis cell.

[0016] 2. The present invention is a method for optimizing the magnetic field of an aluminum electrolytic cell without a compensation busbar. A circular track is arranged around the aluminum electrolytic cell, and a permanent magnetic external compensation device is installed on the track to form a permanent magnetic compensation system for the electrolytic cell. The magnetic field strength and direction generated by each compensation device in the permanent magnetic compensation system are controlled so that they form directional magnetic reconnection with the magnetic field in the electrolytic cell at different positions, thereby realizing the optimization of the overall magnetic field in the electrolytic cell.

[0017] 3. The present invention is a method for optimizing the magnetic field of an aluminum electrolytic cell without a compensation busbar. The number, position, and magnetic field strength of permanent magnetic external compensation devices in the permanent magnetic external compensation system are dynamically adjustable, and dynamic optimization can be achieved according to changes in the magnetic field in the cell.

[0018] The present invention is a method for optimizing the magnetic field of an aluminum electrolysis cell without a compensation busbar. Compared with the existing aluminum electrolysis cell magnetic field optimization technology, the present invention has the following beneficial effects:

[0019] The present invention is a method for optimizing the magnetic field of an aluminum electrolytic cell without a compensation busbar, and uses a permanent magnetic external compensation system to replace the external compensation busbar system to optimize the overall magnetic field in the aluminum electrolytic cell. A circular track is arranged around the aluminum electrolytic cell, and a permanent magnetic external compensation device is installed on the track to form a permanent magnetic compensation system for the electrolytic cell. The magnetic field intensity and direction generated by each compensation device in the permanent magnetic compensation system are controlled to form a directional magnetic reconnection with the magnetic field in the electrolytic cell, thereby optimizing the overall magnetic field in the electrolytic cell and meeting the requirements of the aluminum electrolytic cell, especially the large aluminum electrolytic cell, for magnetic field stability. The present invention completely replaces traditional electromagnetic compensation with permanent magnetic compensation, which changes the existing design concept of the compensation busbar of the aluminum electrolytic cell, not only simplifies the busbar design of the electrolytic cell, but also greatly reduces the investment and operating costs of the magnetic fluid stability of the aluminum electrolytic cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of an aluminum electrolysis cell without a compensation busbar according to the present invention.

[0021] Figure 2 The present invention is a schematic diagram of the local structure of a permanent magnetic external compensation system involved in a method for optimizing the magnetic field of an aluminum electrolysis cell without a compensation busbar.

[0022] Figure 3 This is a schematic diagram of the position of an external compensation device in the permanent magnet external compensation system described in the present invention, wherein the external compensation device is 20 mm horizontally away from the slot side wall and 1500 mm vertically away from the bottom of the slot shell.

[0023] Figure 4 This is a schematic diagram of the position of an external compensation device in the permanent magnet external compensation system described in the present invention, wherein the external compensation device is 400 mm horizontally away from the slot side wall and 10 mm vertically away from the bottom of the slot shell.

[0024] Figure 5 The figure is a schematic diagram of the position of an external compensation device in the permanent magnet external compensation system described in the present invention, wherein the external compensation device is 200 mm horizontally away from the slot side wall and 400 mm vertically away from the bottom of the slot shell.

[0025] Description of reference numerals:

[0026] 1. Upper permanent magnet structure; 2. Lower permanent magnet structure; 3. Adjustable telescopic rod; 4. Structural support rod; 5. Horizontal distance adjustment track; 6. Vertical distance adjustment track; 7. External compensation device moving track. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but the present invention is not limited to the following embodiments.

[0028] Example 1

[0029] The present invention provides a method for optimizing the magnetic field of an aluminum electrolysis cell without a compensation busbar, by arranging a circular track around the aluminum electrolysis cell and setting up a magnetic field on the track. Figure 2 The permanent magnet external compensation device shown in FIG. Figure 1 The electrolytic cell permanent magnet compensation system shown in FIG. 1; in this embodiment, the number of external compensation devices mounted on the circular track is 2; the number one external compensation device is as follows Figure 3 As shown, the vertical height from the bottom of the tank is 10mm, the horizontal distance from the side wall of the tank is 400mm, and the magnetic field strength is 50000Gs; the No. 2 external compensation device is 60mm vertically from the bottom of the tank, 320mm horizontally from the side wall of the tank, and the magnetic field strength is 46000Gs. The No. 1 device is placed in the middle of the length direction of the electrolytic cell, and the No. 2 device is placed in the middle of the width direction.

[0030] In this embodiment, the magnetic field optimization target is a 500kA aluminum electrolytic cell of a certain enterprise without a compensation busbar. z The average value is 11.43Gs, and after optimization it is 11.10Gs.

[0031] Example 2

[0032] The present invention provides a method for optimizing the magnetic field of an aluminum electrolysis cell without a compensation busbar, by arranging a circular track around the aluminum electrolysis cell and setting up a magnetic field on the track. Figure 2The permanent magnet external compensation device shown in FIG. Figure 1 The electrolytic cell permanent magnet compensation system shown in FIG. 1; in this embodiment, the number of external compensation devices mounted on the circular track is 4, and the number one external compensation device is as follows Figure 4 As shown, it is 10mm vertically from the bottom of the tank, 400mm horizontally from the side wall, and has a magnetic field strength of 50000Gs; the No. 2 external compensation device is 60mm vertically from the bottom of the tank, 320mm horizontally from the side wall, and has a magnetic field strength of 46000Gs; the No. 3 external compensation device is 90mm vertically from the bottom of the tank, 250mm horizontally from the side wall, and has a magnetic field strength of 32000Gs; the No. 4 external compensation device is 200mm vertically from the bottom of the tank, 120mm horizontally from the side wall, and has a magnetic field strength of 26000Gs. Devices No. 1 and No. 2 are placed in the middle of the length direction of the electrolytic cell, and devices No. 3 and No. 4 are placed in the middle of the width direction.

[0033] In this embodiment, the magnetic field optimization target is a 500kA aluminum electrolytic cell of a certain enterprise without a compensation busbar. z The average value is 12.19Gs, and after optimization it is 10.68Gs.

[0034] Example 3

[0035] The present invention provides a method for optimizing the magnetic field of an aluminum electrolysis cell without a compensation busbar, by arranging a circular track around the aluminum electrolysis cell and setting up a magnetic field on the track. Figure 3 The permanent magnet external compensation device shown in FIG. Figure 1 The electrolytic cell permanent magnet compensation system shown in the figure; in this embodiment, the number of external compensation devices mounted on the circular track is 8, the No. 1 and No. 2 external compensation devices are 600mm vertically from the bottom of the tank, 100mm horizontally from the side wall, and the magnetic field strength is 100Gs; the No. 3 and No. 4 external compensation devices are 460mm vertically from the bottom of the tank, 130mm horizontally from the side wall, and the magnetic field strength is 500Gs; the No. 5 external compensation device is 920mm vertically from the bottom of the tank, 200mm horizontally from the side wall, and the magnetic field strength is 14000Gs; the No. 6 external compensation device is 600mm vertically from the bottom of the tank, 100mm horizontally from the side wall, and the magnetic field strength is 100Gs; The vertical height is 1000mm, the horizontal distance from the side wall is 140mm, and the magnetic field strength is 2500Gs; the No. 7 external compensation device is 820mm vertically from the bottom of the tank, 120mm horizontally from the side wall, and the magnetic field strength is 3600Gs; the No. 8 external compensation device is 630mm vertically from the bottom of the tank, 50mm horizontally from the side wall, and the magnetic field strength is 13000Gs; No. 1 and No. 2 devices are placed in the middle of the length direction of the electrolytic cell, No. 3 and No. 4 devices are placed in the middle of the width direction, and No. 5, No. 6, No. 7 and No. 8 devices are placed at the four corners respectively.

[0036] In this embodiment, the magnetic field optimization target is a 500kA aluminum electrolytic cell of a certain enterprise without a compensation busbar.z The average value is 11.67Gs, and after optimization it is 3.20Gs.

[0037] Example 4

[0038] The present invention provides a method for optimizing the magnetic field of an aluminum electrolysis cell without a compensation busbar, by arranging a circular track around the aluminum electrolysis cell and setting up a magnetic field on the track. Figure 2 The permanent magnet external compensation device shown in FIG. Figure 1 The electrolytic cell permanent magnet compensation system shown in FIG. 1; in this embodiment, the number of external compensation devices installed on the circular track is 16, and all devices are as follows Figure 3 As shown, the vertical height from the bottom of the cell is 1500mm, the horizontal distance from the side wall is 20mm, and the magnetic field strength is 500Gs; 6 are placed in the length direction of the electrolytic cell, 6 are placed in the width direction, and 1 is placed at each of the four corners.

[0039] In this embodiment, the magnetic field optimization target is a 500kA aluminum electrolytic cell of a certain enterprise without a compensation busbar. z The average value is 11.88Gs, and after optimization it is 7.34Gs.

[0040] Example 5

[0041] The present invention provides a method for optimizing the magnetic field of an aluminum electrolysis cell without a compensation busbar, by arranging a circular track around the aluminum electrolysis cell and setting up a magnetic field on the track. Figure 2 The permanent magnet external compensation device shown in FIG. Figure 1 The electrolytic cell permanent magnet compensation system shown in FIG. 1; in this embodiment, the number of external compensation devices installed on the circular track is 20, and all devices are as follows Figure 5 As shown, the vertical height from the bottom of the cell is 400mm, the horizontal distance from the side wall is 200mm, and the magnetic field strength is 10000Gs; 10 are placed in the length direction of the electrolytic cell, 2 in the width direction, and 2 at each of the four corners.

[0042] In this embodiment, the magnetic field optimization target is a 500kA aluminum electrolytic cell of a certain enterprise without a compensation busbar. z The average value is 12.15Gs, and after optimization it is 9.12Gs.

[0043] Example 6

[0044] The present invention provides a method for optimizing the magnetic field of an aluminum electrolysis cell without a compensation busbar, by arranging a circular track around the aluminum electrolysis cell and setting up a magnetic field on the track. Figure 2 The permanent magnet external compensation device shown in FIG. Figure 1The permanent magnet compensation system of the electrolytic cell shown in the figure; in this embodiment, the number of external compensation devices mounted on the circular track is 8, all of which are 300mm vertically from the bottom of the cell, 350mm horizontally from the side wall, and have a magnetic field strength of 6500Gs; 2 at each of the four corner positions.

[0045] In this embodiment, the magnetic field optimization target is a 500kA aluminum electrolytic cell of a certain enterprise without a compensation busbar. z The average value is 11.67Gs, and after optimization it is 8.93Gs.

[0046] In the description of this specification, the description of reference terms such as "one embodiment", "some embodiments", "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. The orientation or position relationship indicated by the terms "upper" and "lower" is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. The terms "number one", "number two", etc. do not mean that the device has a specific number, but are only for the convenience of distinguishing each device; unless otherwise clearly specified and limited, the term "placement" should be understood in a broad sense, for example, it can be fixed placement or detachable placement. For ordinary technicians in this field, the specific meaning of the above terms in this application can be understood according to the specific circumstances. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0047] The above contents are further detailed descriptions of the present invention in combination with specific implementation methods, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention.

Claims

1. A method for optimizing the magnetic field of an aluminum electrolysis cell without a compensation busbar, wherein the aluminum electrolysis cell does not need to be surrounded by a compensation busbar to optimize the magnetic field in the cell. The method is characterized in that: A circular track is arranged around the aluminum electrolysis cell, and a plurality of permanent magnetic external compensation devices are set up on the track to form a permanent magnetic external compensation system; the number of permanent magnetic external compensation devices constituting the system is adjustable; the height of the permanent magnetic external compensation devices constituting the system is adjustable; the distance between the permanent magnetic external compensation devices constituting the system and the side wall of the cell is adjustable; the magnetic field strength of the permanent magnetic external compensation devices constituting the system is adjustable; the position of the permanent magnetic external compensation devices constituting the system is adjustable; each compensation device in the permanent magnetic external compensation system generates a magnetic field with adjustable strength and direction, which optimizes the overall magnetic field distribution in the aluminum electrolysis cell through directional magnetic reconnection with the magnetic field in the cell.

2. The method for optimizing the magnetic field of an aluminum electrolysis cell without a compensation bus according to claim 1, characterized in that: The number of permanent magnet external compensation devices installed on the circular track includes 1 or more.

3. The method for optimizing the magnetic field of an aluminum electrolysis cell without a compensation bus according to claim 1 or 2, characterized in that: Taking the bottom of the electrolytic cell as the reference plane, the height adjustment range of the permanent magnetic external compensation device constituting the system is 10-1500mm.

4. A method for optimizing the magnetic field of an aluminum electrolysis cell without a compensation bus according to claims 1-3, characterized in that: The permanent magnet external compensation device is 10-400mm away from the slot side wall.

5. A method for optimizing the magnetic field of an aluminum electrolysis cell without a compensation bus according to any one of claims 1 to 4, characterized in that: The magnetic field strength of the permanent magnet external compensation device installed on the annular track around the slot is 100-50000Gs.

6. A method for optimizing the magnetic field of an aluminum electrolysis cell without a compensation bus according to any one of claims 1 to 5, characterized in that: The permanent magnet external compensation device can be moved freely on the entire circular track.

7. A method for optimizing the magnetic field of an aluminum electrolysis cell without a compensation bus according to any one of claims 1 to 6, characterized in that: The strong magnetic field generated by a series of permanent magnetic external compensation devices installed on the circular track corrects and compensates the overall magnetic field fluctuations in the aluminum electrolytic cell through directional magnetic reconnection with the magnetic field in the cell.

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