Method, device and equipment for controlling cell voltage of electrolytic cell

Abstract

The invention discloses a cell voltage control method, device and equipment of an electrolytic cell, the electrolytic cell comprises a plurality of anodes and a plurality of anode guide rods, each anode is provided with one anode guide rod, and the method comprises the following steps: obtaining the cell voltage of the electrolytic cell; if the deviation between the cell voltage of the electrolytic cell and the preset voltage threshold value is larger than the preset deviation threshold value, the anode equidistant voltage drop of each anode guide rod in the multiple anode guide rods is obtained; based on the anode equidistant voltage drop of each anode guide rod in the plurality of anode guide rods, a plurality of abnormal guide rods are selected from the plurality of anode guide rods, and the anode equidistant voltage drop of each guide rod in the plurality of abnormal guide rods exceeds a preset voltage drop range; and performing current-sharing control on the current of the plurality of abnormal guide rods so as to reduce the cell voltage fluctuation of the electrolytic cell. According to the invention, the technical problem of overlarge cell voltage fluctuation of the electrolytic cell is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of electrolytic cells, and in particular relates to a cell voltage control method, device and equipment for an electrolytic cell. Background Art

[0002] In recent years, aluminum electrolysis technology has been developing toward larger capacity, higher efficiency, and lower energy consumption. In particular, cell types have become increasingly larger. Domestically, ultra-large electrolytic cells with capacities ranging from 500kA to 600kA have been successfully developed, featuring as many as 48 to 56 anode groups. However, as cell capacity increases, the strong currents flowing through the cell conductors and busbar system generate a powerful magnetic field. This can cause dramatic fluctuations in the electrolyte and molten aluminum, leading to cell voltage fluctuations. These voltage fluctuations not only increase power consumption but can also shorten the lifespan of the cell.

[0003] In existing technology, when the cell voltage of an aluminum electrolytic cell fluctuates excessively, the usual production management approach is to lift the anode, which has a high conductivity. This method causes the anode base to be unevenly level, causing voltage fluctuations to reappear during subsequent production. Therefore, this method can only achieve a temporary reduction in fluctuations, but cannot effectively reduce cell voltage fluctuations in the long term. Therefore, excessive cell voltage fluctuations in electrolytic cells are a technical problem that urgently needs to be addressed. Summary of the Invention

[0004] The embodiments of the present invention provide a method, device and equipment for controlling the cell voltage of an electrolytic cell, which solve the technical problem of excessive fluctuation in the cell voltage of the electrolytic cell.

[0005] In a first aspect, an embodiment of the present invention provides a method for controlling the cell voltage of an electrolytic cell, wherein the electrolytic cell comprises a plurality of anodes and a plurality of anode guide rods, and an anode guide rod is provided on each of the anodes. The method comprises: obtaining the cell voltage of the electrolytic cell; if the deviation between the cell voltage of the electrolytic cell and a preset voltage threshold is greater than the preset deviation threshold, obtaining the anode equidistant voltage drop of each anode guide rod among the plurality of anode guide rods; based on the anode equidistant voltage drop of each anode guide rod among the plurality of anode guide rods, selecting a plurality of abnormal guide rods from the plurality of anode guide rods, the anode equidistant voltage drop of each guide rod among the plurality of abnormal guide rods exceeding the preset voltage drop range; and performing current balancing control on the currents of the plurality of abnormal guide rods to reduce the cell voltage fluctuation of the electrolytic cell.

[0006] In combination with the first aspect of the present invention, in some embodiments, the current balancing control of the multiple abnormal conductors includes: dividing the multiple abnormal conductors into multiple groups of abnormal conductors; the number of conductors in each group of abnormal conductors is greater than or equal to 2, and in each group of abnormal conductors, there is at least one conductor whose anode equidistant voltage drop is greater than the upper limit value of the preset voltage drop range and at least one conductor whose anode equidistant voltage drop is less than the lower limit value of the preset voltage drop range; and current balancing control is performed on the current of each group of abnormal conductors.

[0007] In combination with the first aspect of the present invention, in some embodiments, the current balancing control is performed separately for each group of abnormal conductors, including: for each group of abnormal conductors, at least one current balancing component is selected for the group of abnormal conductors from a plurality of current balancing components, and the current balancing control is performed on the current of the group of abnormal conductors through the at least one current balancing component; wherein each of the current balancing components includes a current balancing sheet for conducting current.

[0008] In combination with the first aspect of the present invention, in some embodiments, the group of abnormal guide rods includes a first abnormal guide rod and a second abnormal guide rod, the anode equidistant voltage drop of the first abnormal guide rod is greater than the upper limit value of the preset voltage drop range, and the anode equidistant voltage drop of the second abnormal guide rod is less than the lower limit value of the preset voltage drop range; the selecting of at least one current balancing component for the group of abnormal guide rods from a plurality of current balancing components includes: determining a target current compensation amount from the first abnormal guide rod to the second abnormal guide rod based on a voltage drop deviation between the anode equidistant voltage drop of the first abnormal guide rod and the anode equidistant voltage drop of the second abnormal guide rod; determining a target cross-sectional area based on the target current compensation amount; and using a current balancing component among the plurality of current balancing components whose current balancing sheet cross-sectional area is the target cross-sectional area as a first current balancing component; and the at least one current balancing component includes the first current balancing component.

[0009] In combination with the first aspect of the present invention, in some embodiments, each of the current balancing components further includes a first connector connected to one end of the current balancing plate of the current balancing component and a second connector connected to the other end of the current balancing plate of the current balancing component; the current balancing control of the current of the group of abnormal conductors through the at least one current balancing component includes: connecting the first connector of the first current balancing component to the first abnormal conductor, and connecting the second connector of the first current balancing component to the second abnormal conductor; after completing the connection, monitoring the current anode equidistant voltage drop of the first abnormal conductor and the current anode equidistant voltage drop of the second abnormal conductor; if the current anode equidistant voltage drop of the first abnormal conductor is within the preset voltage drop range, and the current anode equidistant voltage drop of the second abnormal conductor is within the preset voltage drop range, disconnecting the connection between the first current balancing component and the first abnormal conductor and the second abnormal conductor.

[0010] In combination with the first aspect of the present invention, in some embodiments, the group of abnormal guide rods includes a first abnormal guide rod, a second abnormal guide rod and a third abnormal guide rod, the anode equidistant pressure drop of the first abnormal guide rod is greater than the upper limit of the preset pressure drop range, the anode equidistant pressure drop of the second abnormal guide rod is less than the lower limit of the preset pressure drop range, and the anode equidistant pressure drop of the third abnormal guide rod is less than the lower limit of the preset pressure drop range; the selecting of at least one current balancing component for the group of abnormal guide rods from a plurality of current balancing components includes: based on the pressure drop deviation of the anode equidistant pressure drop of the first abnormal guide rod and the anode equidistant pressure drop of the second abnormal guide rod, and the anode equidistant pressure drop of the first abnormal guide rod and the anode equidistant pressure drop of the third abnormal guide rod. The voltage drop deviation of the anode equidistant voltage drop is used to determine the first target current compensation amount from the first abnormal conductor to the second abnormal conductor, and the second target current compensation amount from the first abnormal conductor to the third abnormal conductor; a first target cross-sectional area is determined based on the first target current compensation amount; a second target cross-sectional area is determined based on the second target current compensation amount; among the multiple current balancing components, the current balancing component with the current balancing sheet cross-sectional area of ​​the first target cross-sectional area is used as the first current balancing component; among the multiple current balancing components, the current balancing component with the current balancing sheet cross-sectional area of ​​the second target cross-sectional area is used as the second current balancing component; the at least one current balancing component includes the first current balancing component and the second current balancing component.

[0011] In combination with the first aspect of the present invention, in some embodiments, each of the current balancing components further includes a first connector connected to one end of the current balancing plate of the current balancing component and a second connector connected to the other end of the current balancing plate of the current balancing component; the current balancing control of the current of the group of abnormal guide rods by using the at least one current balancing component includes: connecting the first connector of the first current balancing component to the first abnormal guide rod, connecting the second connector of the first current balancing component to the second abnormal guide rod; connecting the first connector of the second current balancing component to the first abnormal guide rod, connecting the second connector of the second current balancing component to the third abnormal guide rod; after completing the connection Afterwards, monitor the current anode equidistant pressure drop of the first abnormal guide rod, the current anode equidistant pressure drop of the second abnormal guide rod, and the current anode equidistant pressure drop of the third abnormal guide rod; if the current anode equidistant pressure drop of the first abnormal guide rod is within the preset pressure drop range, the current anode equidistant pressure drop of the second abnormal guide rod is within the preset pressure drop range, and the current anode equidistant pressure drop of the third abnormal guide rod is within the preset pressure drop range, disconnect the first current balancing component from the first abnormal guide rod and the second abnormal guide rod, and disconnect the second current balancing component from the first abnormal guide rod and the third abnormal guide rod.

[0012] In combination with the first aspect of the present invention, in some embodiments, when the current balancing assembly is connected to the abnormal guide rod, the distance between the current balancing assembly and the steel claw used to connect the corresponding anode is 500mm to 1000mm, and the angle between the current balancing assembly and the liquid surface of the electrolyte in the electrolytic cell is 0 degrees to 60 degrees.

[0013] In a second aspect, an embodiment of the present invention provides a cell voltage control device for an electrolytic cell, wherein the electrolytic cell comprises a plurality of anodes and a plurality of anode guide rods, and an anode guide rod is provided on each of the anodes, and the device comprises: a voltage acquisition unit for acquiring the cell voltage of the electrolytic cell; a voltage drop acquisition unit for acquiring the anode equidistant voltage drop of each anode guide rod among the plurality of anode guide rods if the deviation between the cell voltage of the electrolytic cell and a preset voltage threshold is greater than a preset deviation threshold; a selection unit for selecting a plurality of abnormal guide rods from the plurality of anode guide rods based on the anode equidistant voltage drop of each anode guide rod among the plurality of anode guide rods, the anode equidistant voltage drop of each guide rod among the plurality of abnormal guide rods exceeding a preset voltage drop range; and a current sharing control unit for performing current sharing control on the currents of the plurality of abnormal guide rods to reduce the cell voltage fluctuation of the electrolytic cell.

[0014] In a third aspect, an embodiment of the present invention provides an electronic device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements any one of the methods described in the first aspect when executing the computer program.

[0015] The one or more technical solutions provided by the embodiments of the present invention achieve at least the following technical effects or advantages: The embodiment of the present invention obtains the cell voltage of the electrolytic cell; if the deviation between the cell voltage of the electrolytic cell and a preset voltage threshold is greater than the preset deviation threshold, obtains the anode equidistant voltage drop of each anode guide rod among the multiple anode guide rods; based on the anode equidistant voltage drop of each anode guide rod among the multiple anode guide rods, selects multiple abnormal anode guide rods from the multiple anode guide rods, wherein the anode equidistant voltage drop of each of the multiple abnormal anode guide rods exceeds a preset voltage drop range; and performs current balancing control on the multiple abnormal anode guide rods to reduce cell voltage fluctuations of the electrolytic cell. After the currents of the multiple abnormal guide rods are balanced, the current differences between the multiple abnormal guide rods can be reduced, and the currents of the multiple abnormal guide rods can be stabilized within a normal range. That is, the currents of the anodes corresponding to the multiple abnormal guide rods are stabilized within a normal range, thereby reducing the current fluctuations of the anodes of the electrolytic cell, thereby reducing the cell voltage fluctuations of the electrolytic cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 Flowchart of a cell voltage control method for an electrolytic cell according to an embodiment of the present invention; Figure 2 Schematic diagram of the connection between the current balancing component and the abnormal guide rod in an embodiment of the present invention; Figure 3 Schematic diagram of the connection of the current balancing assembly when the number of abnormal guide rods is 2 in an embodiment of the present invention; Figure 4 Schematic diagram of a current balancing component according to an embodiment of the present invention; Figure 5 Schematic diagram of the connection of the current balancing assembly when the number of abnormal guide rods is 3 in an embodiment of the present invention; Figure 6 1. It is a functional module diagram of a cell voltage control device for an electrolytic cell according to an embodiment of the present invention; Figure 7 Schematic diagram of the structure of an electronic device in an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0019] In the present invention, descriptions such as "first" and "second" are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions of various embodiments may be combined with each other, but this must be based on the fact that they can be implemented by a person of ordinary skill in the art. If the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0020] The embodiment of the present invention provides a cell voltage control method for an electrolytic cell, wherein the electrolytic cell comprises a plurality of anodes and a plurality of anode guide rods, and an anode guide rod is provided on each anode. Figure 1 As shown, the method includes the following steps S101 to S104: S101: Obtaining the cell voltage of the electrolytic cell.

[0021] It should be noted that the cell voltage of an electrolytic cell refers to the voltage drop between adjacent cathodes and anodes in the electrolytic cell. Specifically, the electrolytic cell may be an aluminum electrolytic cell.

[0022] S102: If the deviation between the cell voltage of the electrolytic cell and the preset voltage threshold is greater than the preset deviation threshold, obtain the anode equidistant voltage drop of each anode guide rod among the multiple anode guide rods.

[0023] It should be noted that if the cell voltage of the electrolytic cell deviates from the preset voltage threshold by more than the preset deviation threshold, it indicates that the cell voltage fluctuates too much. The anode equidistant voltage drop of the anode guide rod refers to the voltage drop measured at a certain distance on the anode guide rod.

[0024] S103: Based on the anode equidistant voltage drop of each anode guide rod among the multiple anode guide rods, a plurality of abnormal guide rods are selected from the multiple anode guide rods, wherein the anode equidistant voltage drop of each guide rod among the multiple abnormal guide rods exceeds a preset voltage drop range.

[0025] It should be noted that the preset voltage drop range indicates that the anode equidistant voltage drop of the anode guide rod is a normal value and has little effect on the cell voltage fluctuation.

[0026] S104: performing current balancing control on the currents of the multiple abnormal guide rods to reduce the cell voltage fluctuation of the electrolytic cell.

[0027] It should be noted that to reduce cell voltage fluctuations in the electrolytic cell, current sharing control can be performed on only the abnormal conductors, or on both normal and abnormal conductors. However, the latter approach requires more objects to be controlled by current sharing, increasing the complexity of selecting current sharing components, which in turn leads to low efficiency of current sharing control. Therefore, the embodiments of the present invention precisely select abnormal conductors, reduce the number of objects to be controlled by current sharing, reduce the complexity of selecting current sharing components, and thus improve the efficiency of current sharing control.

[0028] In some embodiments, current balancing control of multiple abnormal conductors may include: dividing the multiple abnormal conductors into multiple groups of abnormal conductors; the number of conductors in each group of abnormal conductors is greater than or equal to 2, and in each group of abnormal conductors, there is at least one conductor whose anode equidistant voltage drop is greater than the upper limit of a preset voltage drop range and at least one conductor whose anode equidistant voltage drop is less than the lower limit of the preset voltage drop range; and current balancing control is performed on the current of each group of abnormal conductors.

[0029] In some embodiments, dividing multiple abnormal guide rods into multiple groups of abnormal guide rods may include: taking the abnormal guide rods that are not grouped among the multiple abnormal guide rods as the first target guide rod; taking the abnormal guide rod that is less than a preset distance from the first target guide rod as the second target guide rod; if the first target guide rod is greater than the upper limit value of the preset pressure drop range and the second target guide rod is less than the lower limit value of the preset pressure drop range, or the second target guide rod is greater than the upper limit value of the preset pressure drop range and the first target guide rod is less than the lower limit value of the preset pressure drop range, dividing the first target guide rod and the second target guide rod into a group of abnormal guide rods.

[0030] It should be noted that multiple abnormal guide rods can be treated as a single group for current sharing control. However, due to the large number of controlled objects, the current sharing process becomes complex and difficult to ensure the quality of current sharing control. Therefore, the embodiments of the present invention limit the division of multiple abnormal guide rods into multiple groups of abnormal guide rods, and then perform current sharing control on each of them. This reduces the complexity of current sharing control while ensuring the quality of current sharing control.

[0031] In some embodiments, current balancing control is performed separately for the current of each group of abnormal conductors, which may include: for each group of abnormal conductors, selecting at least one current balancing component for the group of abnormal conductors from a plurality of current balancing components, and performing current balancing control on the current of the group of abnormal conductors through the at least one current balancing component; wherein each current balancing component includes a current balancing sheet for conducting current.

[0032] It should be noted that when the number of guide rods in each group of abnormal guide rods is different, the number of selected current sharing components is also different, and the current sharing control method is also different. Figure 2 Schematic diagram of the connection between the current balancing component and the abnormal guide rod in an embodiment of the present invention. Figure 3 This is a schematic diagram of the connection of the current balancing components when the number of abnormal guide rods is 2 in the embodiment of the present invention. Figure 2 and Figure 3 When the group of abnormal guide rods includes a first abnormal guide rod and a second abnormal guide rod, the selection and current sharing control method are specifically described: In some embodiments, the anode equidistant voltage drop of the first abnormal conductor is greater than the upper limit of a preset voltage drop range, and the anode equidistant voltage drop of the second abnormal conductor is less than the lower limit of the preset voltage drop range; selecting at least one current balancing component for the group of abnormal conductors from a plurality of current balancing components may include: determining a target current compensation amount from the first abnormal conductor to the second abnormal conductor based on a voltage drop deviation between the anode equidistant voltage drop of the first abnormal conductor and the anode equidistant voltage drop of the second abnormal conductor; determining a target cross-sectional area based on the target current compensation amount; using a current balancing component whose current balancing sheet cross-sectional area is the target cross-sectional area among the plurality of current balancing components as a first current balancing component; and at least one current balancing component includes the first current balancing component.

[0033] In some embodiments, the greater the voltage drop deviation between the anode equidistant voltage drop of the first abnormal conductor and the anode equidistant voltage drop of the second abnormal conductor, the greater the target current compensation amount; the greater the target current compensation amount, the larger the target cross-sectional area.

[0034] It should be noted that the larger the cross-sectional area of ​​the current balancing sheet, the better the corresponding flow guiding effect. It is also possible to arbitrarily select a current balancing component to perform current balancing control on the abnormal guide rod, which can simplify the program and improve operability. However, there may be the following problems, such as the voltage drop deviation of the anode equidistant voltage drop of the first abnormal guide rod and the anode equidistant voltage drop of the second abnormal guide rod is very large, but the cross-sectional area of ​​the current balancing sheet of the current balancing component is small. At this time, the voltage drop deviation is large and the flow guiding efficiency is low, and the flow balancing control time is greatly extended. Therefore, the embodiment of the present invention limits the determination of the target current compensation amount based on the voltage drop deviation, and then determines the target cross-sectional area based on the target current compensation amount, and then selects a suitable current balancing component to avoid the situation where the voltage drop deviation is large and the flow guiding efficiency is low, thereby achieving the improvement of the flow balancing control efficiency of the abnormal guide rod.

[0035] In some embodiments, each current balancing component further includes a first connector connected to one end of the current balancing plate of the current balancing component and a second connector connected to the other end of the current balancing plate of the current balancing component; current balancing control of the current of the group of abnormal conductors through at least one current balancing component may include: connecting the first connector of the first current balancing component to the first abnormal conductor, and connecting the second connector of the first current balancing component to the second abnormal conductor; after completing the connection, monitoring the current anode equidistant voltage drop of the first abnormal conductor and the current anode equidistant voltage drop of the second abnormal conductor; if the current anode equidistant voltage drop of the first abnormal conductor is within a preset voltage drop range, and the current anode equidistant voltage drop of the second abnormal conductor is within the preset voltage drop range, disconnecting the connection between the first current balancing component and the first abnormal conductor and the second abnormal conductor.

[0036] Figure 4 Schematic diagram of the current balancing component in an embodiment of the present invention. Figure 4 As shown, the first connecting member may include: a first explosive welding block, one end of which is connected to one end of the current equalizing plate; a first clamp, one end of which is connected to the other end of the first explosive welding block, and a first bolt provided on the first clamp, the first bolt being used to secure the first clamp to one abnormal guide rod. The second connecting member may include: a second explosive welding block, one end of which is connected to the other end of the current equalizing plate; a second clamp, one end of which is connected to the other end of the second explosive welding block, and a second bolt provided on the second clamp, the second bolt being used to secure the second clamp to the other abnormal guide rod.

[0037] refer to Figure 5 As shown, Figure 5This is a schematic diagram of the connection of the current balancing assembly when the number of abnormal guide rods is three in an embodiment of the present invention. When the group of abnormal guide rods includes a first abnormal guide rod, a second abnormal guide rod, and a third abnormal guide rod, the selection and current balancing control method are specifically described: In some embodiments, the anode equidistant pressure drop of the first abnormal guide rod is greater than the upper limit of the preset pressure drop range, the anode equidistant pressure drop of the second abnormal guide rod is less than the lower limit of the preset pressure drop range, and the anode equidistant pressure drop of the third abnormal guide rod is less than the lower limit of the preset pressure drop range; selecting at least one current balancing component for the group of abnormal guide rods from a plurality of current balancing components may include: determining the first abnormal guide rod based on the pressure drop deviation between the anode equidistant pressure drop of the first abnormal guide rod and the anode equidistant pressure drop of the second abnormal guide rod, and the pressure drop deviation between the anode equidistant pressure drop of the first abnormal guide rod and the anode equidistant pressure drop of the third abnormal guide rod. A first target current compensation amount from the abnormal conductor to the second abnormal conductor, and a second target current compensation amount from the first abnormal conductor to the third abnormal conductor; determining a first target cross-sectional area based on the first target current compensation amount; determining a second target cross-sectional area based on the second target current compensation amount; using a current balancing component with a current balancing sheet cross-sectional area of ​​the first target cross-sectional area among multiple current balancing components as a first current balancing component; using a current balancing component with a current balancing sheet cross-sectional area of ​​the second target cross-sectional area among multiple current balancing components as a second current balancing component; at least one current balancing component includes a first current balancing component and a second current balancing component.

[0038] In some embodiments, the greater the voltage drop deviation between the anode equidistant voltage drop of the first abnormal guide rod and the anode equidistant voltage drop of the second abnormal guide rod, and the smaller the voltage drop deviation between the anode equidistant voltage drop of the first abnormal guide rod and the anode equidistant voltage drop of the third abnormal guide rod, the greater the first target current compensation amount and the smaller the second target current compensation amount; the greater the first target current compensation amount, the larger the first target cross-sectional area; the greater the second target current compensation amount, the larger the second target cross-sectional area.

[0039] In some embodiments, each current balancing component further includes a first connector connected to one end of the current balancing plate of the current balancing component and a second connector connected to the other end of the current balancing plate of the current balancing component; controlling the current balancing of the group of abnormal guide rods by at least one current balancing component may include: connecting the first connector of the first current balancing component to the first abnormal guide rod, connecting the second connector of the first current balancing component to the second abnormal guide rod; connecting the first connector of the second current balancing component to the first abnormal guide rod, connecting the second connector of the second current balancing component to the third abnormal guide rod; after completing the connection Then, monitor the current anode equidistant voltage drop of the first abnormal guide rod, the current anode equidistant voltage drop of the second abnormal guide rod, and the current anode equidistant voltage drop of the third abnormal guide rod; if the current anode equidistant voltage drop of the first abnormal guide rod is within the preset voltage drop range, the current anode equidistant voltage drop of the second abnormal guide rod is within the preset voltage drop range, and the current anode equidistant voltage drop of the third abnormal guide rod is within the preset voltage drop range, disconnect the first current balancing component from the first abnormal guide rod and the second abnormal guide rod, and disconnect the second current balancing component from the first abnormal guide rod and the third abnormal guide rod.

[0040] It should be noted that the above examples only illustrate the cases where the group of abnormal guide rods includes 2 and 3 abnormal guide rods. Each group of abnormal guide rods can also be 4, 5 or 6, etc. The selection is similar to the current sharing control method, and they are not listed here one by one.

[0041] In some embodiments, when the current balancing assembly is connected to the abnormal guide rod, the distance between the current balancing assembly and the steel claw used to connect to the corresponding anode is 500 mm to 1000 mm, and the angle between the current balancing assembly and the liquid surface of the electrolyte in the electrolytic cell is 0 degrees to 60 degrees.

[0042] It should be noted that when the angle between the current balancing component and the liquid surface of the electrolyte in the electrolytic cell is 0 to 60 degrees, the flow guiding efficiency of the current balancing sheet can be improved.

[0043] It should be noted that the greater the current intensity of the electrolytic cell and the more anode groups there are, the more likely the cell voltage is to fluctuate. Therefore, the embodiment of the present invention is particularly suitable for electrolytic cells with a current intensity greater than 300kA and a number of anode groups greater than 10. Specifically, the current intensity can be an ultra-large electrolytic cell of the 500kA to 600kA level, and the number of anode groups is 48 to 56 groups.

[0044] It should be noted that after connecting the current-sharing assembly to the abnormal conductor, the anode voltage drop at equal intervals can be measured after 4-16 hours of operation to determine whether it has returned to the normal range, or the cell voltage fluctuation can be observed to determine whether it has returned to normal. The current-sharing assembly can be disconnected after the anode voltage drop at equal intervals or the cell voltage fluctuation has returned to normal. Excessive cell voltage fluctuation can be determined by measuring the deviation between the cell voltage and a preset voltage threshold, or by other methods, such as determining whether the cell voltage fluctuation exceeds 30%-60% of the normal range. If so, the cell voltage fluctuation is considered excessive. Furthermore, the above method selects the abnormal conductor based on whether its anode voltage drop at equal intervals exceeds the preset voltage drop range. Other methods can also be used, such as determining whether its anode voltage drop at equal intervals deviates from the normal range by 20%-70%. The current-sharing sheet can be made of aluminum, steel, or copper, and multiple sheets can be stacked. The explosive welding block can be an aluminum-steel explosive welding block, and the fixture can be a steel frame structure.

[0045] To enhance the understanding of the embodiments of the present invention, the following examples are given:

[0046] Example 1: A 500kA electrolytic cell series 509# cell issued a voltage fluctuation warning signal. After determining that the cell voltage fluctuation was too large, the anode equidistant voltage drop of 48 groups of anode guide rods was measured. The preset voltage drop range was 2.2mV to 2.5mV. The anode equidistant voltage drop corresponding to anode A10 was 4.2mV, and the anode equidistant voltage drops corresponding to adjacent anodes A9 and A11 were 1.7mV and 1.9mV respectively. After selecting the first and second current balancing components, the anode guide rods corresponding to A9 and A10 were connected through the first current balancing component, and the anode guide rods corresponding to A11 and A10 were connected through the second current balancing component. The specific connection method is shown in Figure 5 After 6 hours of operation, the corresponding anode equidistant voltage drops of anodes A9, A10, and A11 were 2.2mV, 2.5mV, and 2.3mV, respectively, reaching the normal range. At this time, the cell noise value had dropped to 21mV. The two current-sharing components were removed, and the electrolytic cell resumed normal production.

[0047] Example 2: A 400kA electrolytic cell series, cell 116#, issued a voltage fluctuation warning signal. After determining that the cell voltage fluctuation was too large, the anode equidistant voltage drop of 40 anode guide rods was measured. The preset voltage drop range was 2.0-2.3mV. The anode equidistant voltage drop corresponding to anode B6 was 3.9mV, and the anode equidistant voltage drop corresponding to anode A6 was 1.2mV. The anode guide rods corresponding to B6 and A6 were connected using the first current balancing component. The specific connection method is shown in Figure 3After 10 hours of operation using the current equalizer, the measured anode equidistant voltage drops corresponding to B6 and A6 were 2.3mV and 2.1mV, respectively, which were within the normal value range. At this time, the cell noise value had dropped to 19mV. The first current equalizer component was removed and the electrolytic cell resumed normal production.

[0048] In actual production, the method of the embodiment of the present invention is superior to the prior art, and the following data is used for comparison: Comparative Example 1 takes Example 1 as a reference. The difference between Comparative Example 1 and Example 1 is that the anode A10 with the largest deviation from the equidistant voltage drop of the anode is lifted by a crane by 1 cm. After lifting and running for 6 hours, the noise value of the cell drops to 22mV. After lifting and running for 12 hours, the noise value of the cell reaches 31mV. This method fails to fundamentally solve the voltage fluctuation problem of the electrolytic cell. Comparative Example 2 takes Example 2 as a reference. The difference between Comparative Example 2 and Example 2 is that the method of raising the working voltage by 100mV is adopted. After running for 12 hours using this method, the noise value of the cell has dropped to 20mV, reaching the normal range, but the consumption of electricity is increased by 400kWh during the high noise processing. It should be noted that the embodiment of the present invention solves the voltage fluctuation problem by re-adjusting the anode current distribution of the aluminum electrolytic cell by a current equalizing component. This method reduces power consumption, saves production costs, and is simple, convenient and effective to operate.

[0049] The embodiment of the present invention obtains the cell voltage of the electrolytic cell; if the deviation between the cell voltage of the electrolytic cell and a preset voltage threshold is greater than the preset deviation threshold, obtains the anode equidistant voltage drop of each anode guide rod among the multiple anode guide rods; based on the anode equidistant voltage drop of each anode guide rod among the multiple anode guide rods, selects multiple abnormal anode guide rods from the multiple anode guide rods, wherein the anode equidistant voltage drop of each of the multiple abnormal anode guide rods exceeds a preset voltage drop range; and performs current balancing control on the multiple abnormal anode guide rods to reduce cell voltage fluctuations of the electrolytic cell. After the currents of the multiple abnormal guide rods are balanced, the current differences between the multiple abnormal guide rods can be reduced, and the currents of the multiple abnormal guide rods can be stabilized within a normal range. That is, the currents of the anodes corresponding to the multiple abnormal guide rods are stabilized within a normal range, thereby reducing the current fluctuations of the anodes of the electrolytic cell, thereby reducing the cell voltage fluctuations of the electrolytic cell.

[0050] Based on the same invention concept, Figure 6As shown, an embodiment of the present invention provides a cell voltage control device 10 for an electrolytic cell, wherein the electrolytic cell includes multiple anodes and multiple anode guide rods, and an anode guide rod is provided on each anode. The device includes: a voltage acquisition unit 110, for acquiring the cell voltage of the electrolytic cell; a voltage drop acquisition unit 120, for acquiring the anode equidistant voltage drop of each anode guide rod in the multiple anode guide rods if the deviation between the cell voltage of the electrolytic cell and a preset voltage threshold is greater than the preset deviation threshold; a selection unit 130, for selecting a plurality of abnormal guide rods from the multiple anode guide rods based on the anode equidistant voltage drop of each anode guide rod in the multiple anode guide rods, wherein the anode equidistant voltage drop of each guide rod in the multiple abnormal guide rods exceeds the preset voltage drop range; and a current sharing control unit 140, for performing current sharing control on the currents of the multiple abnormal guide rods to reduce the cell voltage fluctuation of the electrolytic cell.

[0051] It can be understood that the current balancing control unit 140 includes: a division sub-unit, used to divide multiple abnormal guide rods into multiple groups of abnormal guide rods; the number of guide rods in each group of abnormal guide rods is greater than or equal to 2, and in each group of abnormal guide rods, there is at least one guide rod whose anode equidistant voltage drop is greater than the upper limit value of the preset voltage drop range and at least one guide rod whose anode equidistant voltage drop is less than the lower limit value of the preset voltage drop range; a current balancing sub-unit, used to perform current balancing control on the current of each group of abnormal guide rods respectively.

[0052] It can be understood that the current balancing sub-unit includes: a selection module for selecting at least one current balancing component for each group of abnormal guide rods from multiple current balancing components; a current balancing module for controlling the current balancing of the group of abnormal guide rods through at least one current balancing component; wherein each current balancing component includes a current balancing sheet for guiding current.

[0053] In some embodiments, the group of abnormal guide rods includes a first abnormal guide rod and a second abnormal guide rod, the anode equidistant voltage drop of the first abnormal guide rod is greater than the upper limit of a preset voltage drop range, and the anode equidistant voltage drop of the second abnormal guide rod is less than the lower limit of the preset voltage drop range; the selection module is specifically used to: determine the target current compensation amount from the first abnormal guide rod to the second abnormal guide rod based on the voltage drop deviation between the anode equidistant voltage drop of the first abnormal guide rod and the anode equidistant voltage drop of the second abnormal guide rod; determine the target cross-sectional area based on the target current compensation amount; use the current balancing component with the target cross-sectional area of ​​the current balancing sheet among multiple current balancing components as the first current balancing component; at least one current balancing component includes the first current balancing component.

[0054] In some embodiments, each current balancing component also includes a first connector connected to one end of the current balancing plate of the current balancing component and a second connector connected to the other end of the current balancing plate of the current balancing component; the current balancing module is specifically used to: connect the first connector of the first current balancing component to the first abnormal guide rod, and connect the second connector of the first current balancing component to the second abnormal guide rod; after completing the connection, monitor the current anode equidistant voltage drop of the first abnormal guide rod and the current anode equidistant voltage drop of the second abnormal guide rod; if the current anode equidistant voltage drop of the first abnormal guide rod is within the preset voltage drop range, and the current anode equidistant voltage drop of the second abnormal guide rod is within the preset voltage drop range, disconnect the connection between the first current balancing component and the first abnormal guide rod and the second abnormal guide rod.

[0055] In other embodiments, the group of abnormal guide rods includes a first abnormal guide rod, a second abnormal guide rod, and a third abnormal guide rod, the anode equidistant pressure drop of the first abnormal guide rod is greater than the upper limit of the preset pressure drop range, the anode equidistant pressure drop of the second abnormal guide rod is less than the lower limit of the preset pressure drop range, and the anode equidistant pressure drop of the third abnormal guide rod is less than the lower limit of the preset pressure drop range; the selection module is specifically used to: based on the pressure drop deviation of the anode equidistant pressure drop of the first abnormal guide rod and the anode equidistant pressure drop of the second abnormal guide rod, and the pressure drop deviation of the anode equidistant pressure drop of the first abnormal guide rod and the anode equidistant pressure drop of the third abnormal guide rod, Determine a first target current compensation amount from the first abnormal conductor to the second abnormal conductor, and a second target current compensation amount from the first abnormal conductor to the third abnormal conductor; determine a first target cross-sectional area based on the first target current compensation amount; determine a second target cross-sectional area based on the second target current compensation amount; among multiple current balancing components, a current balancing component whose current balancing sheet cross-sectional area is the first target cross-sectional area is used as a first current balancing component; among multiple current balancing components, a current balancing component whose current balancing sheet cross-sectional area is the second target cross-sectional area is used as a second current balancing component; at least one current balancing component includes a first current balancing component and a second current balancing component.

[0056] In other embodiments, each current balancing component further includes a first connector connected to one end of the current balancing plate of the current balancing component and a second connector connected to the other end of the current balancing plate of the current balancing component; the current balancing module is specifically used to: connect the first connector of the first current balancing component to the first abnormal guide rod, and connect the second connector of the first current balancing component to the second abnormal guide rod; connect the first connector of the second current balancing component to the first abnormal guide rod, and connect the second connector of the second current balancing component to the third abnormal guide rod; after completing the connection, monitor the current anode equidistant voltage drop of the first abnormal guide rod, the current anode equidistant voltage drop of the second abnormal guide rod, and the current anode equidistant voltage drop of the third abnormal guide rod; if the current anode equidistant voltage drop of the first abnormal guide rod is within the preset voltage drop range, the current anode equidistant voltage drop of the second abnormal guide rod is within the preset voltage drop range, and the current anode equidistant voltage drop of the third abnormal guide rod is within the preset voltage drop range, disconnect the first current balancing component from the first abnormal guide rod and the second abnormal guide rod, and disconnect the second current balancing component from the first abnormal guide rod and the third abnormal guide rod.

[0057] Among them, when the current balancing component is connected to the abnormal guide rod, the distance between the current balancing component and the steel claw used to connect the corresponding positive stage is 500mm to 1000mm, and the angle between the current balancing component and the liquid surface of the electrolyte in the electrolytic cell is 0 degrees to 60 degrees.

[0058] It should be understood that more implementation details of the cell voltage control device 10 for the electrolytic cell in the embodiment of the present invention can be found in the aforementioned cell voltage control method for the electrolytic cell, and will not be repeated here for the sake of brevity.

[0059] Based on the same inventive concept, an embodiment of the present invention further provides an electronic device, such as Figure 7 As shown, it includes a memory 704, a processor 702 and a computer program stored in the memory 704 and executable on the processor 702. The processor 702 executes the program to implement the steps described in any embodiment of the method for controlling the cell voltage of the electrolytic cell.

[0060] Among them, Figure 7In the present invention, a bus architecture (represented by bus 700) is shown. Bus 700 may include any number of interconnected buses and bridges. Bus 700 links various circuits, including one or more processors represented by processor 702 and memory represented by memory 704. Bus 700 may also link various other circuits, such as peripherals, voltage regulators, and power management circuits, all of which are well known in the art and, therefore, will not be described further herein. Bus interface 705 provides an interface between bus 700 and receiver 701 and transmitter 703. Receiver 701 and transmitter 703 may be the same component, namely a transceiver, which provides a means for communicating with various other devices over a transmission medium. Processor 702 is responsible for managing bus 700 and general processing, while memory 704 may be used to store data used by processor 702 when performing operations.

[0061] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored as one or more instructions or codes on or transmitted via a computer-readable medium. Other examples and implementations are within the scope and spirit of the present invention and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwiring, or a combination of any of these. Furthermore, each functional unit may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit.

[0062] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only exemplary. For example, the division of the units can be a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0063] The units described as separate components may or may not be physically separate, and the components of the control device may or may not be physical units, that is, they may be located in one place or distributed across multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0064] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk, etc. Various media that can store program codes.

[0065] The foregoing description is merely an embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be included within the scope of the claims.

Claims

1. A method for controlling the cell voltage of an electrolytic cell, characterized in that: The electrolytic cell comprises a plurality of anodes and a plurality of anode guide rods, wherein one anode guide rod is provided on each anode, and the method comprises: obtaining a cell voltage of the electrolytic cell; If the deviation between the cell voltage of the electrolytic cell and the preset voltage threshold is greater than the preset deviation threshold, obtaining the anode equidistant voltage drop of each anode guide rod of the plurality of anode guide rods; Based on the anode equidistant voltage drop of each anode guide rod among the plurality of anode guide rods, a plurality of abnormal guide rods are selected from the plurality of anode guide rods, wherein the anode equidistant voltage drop of each anode guide rod among the plurality of abnormal guide rods exceeds a preset voltage drop range; The currents of the plurality of abnormal guide rods are controlled to be equalized to reduce the cell voltage fluctuation of the electrolytic cell.

2. The cell voltage control method of the electrolytic cell according to claim 1, characterized in that: The current balancing control of the multiple abnormal guide rods includes: Dividing the plurality of abnormal guide rods into a plurality of groups of abnormal guide rods; the number of guide rods in each group of abnormal guide rods is greater than or equal to 2, and in each group of abnormal guide rods, there is at least one guide rod whose anode equidistant pressure drop is greater than an upper limit of the preset pressure drop range and at least one guide rod whose anode equidistant pressure drop is less than a lower limit of the preset pressure drop range; Current balancing control is performed on the current of each group of abnormal guide rods.

3. The cell voltage control method of the electrolytic cell according to claim 2, characterized in that: The current equalization control is performed on each group of abnormal guide rods, including: For each group of abnormal guide rods, at least one current balancing component is selected from a plurality of current balancing components for the group of abnormal guide rods, and current balancing control is performed on the current of the group of abnormal guide rods by using the at least one current balancing component; Wherein, each of the current balancing components includes a current balancing sheet for guiding the flow.

4. The method for controlling the cell voltage of an electrolytic cell according to claim 3, wherein: The group of abnormal guide rods includes a first abnormal guide rod and a second abnormal guide rod, wherein the anode equidistant pressure drop of the first abnormal guide rod is greater than the upper limit of the preset pressure drop range, and the anode equidistant pressure drop of the second abnormal guide rod is less than the lower limit of the preset pressure drop range; The step of selecting at least one current balancing component for the group of abnormal guide rods from a plurality of current balancing components comprises: determining a target current compensation amount from the first abnormal conductor to the second abnormal conductor based on a voltage drop deviation between the anode equidistant voltage drop of the first abnormal conductor and the anode equidistant voltage drop of the second abnormal conductor; determining a target cross-sectional area based on the target current compensation amount; Among the multiple current balancing components, the current balancing component whose current balancing sheet cross-sectional area is the target cross-sectional area is used as the first current balancing component; and the at least one current balancing component includes the first current balancing component.

5. The method for controlling the cell voltage of an electrolytic cell according to claim 4, wherein: Each of the current balancing components further includes a first connector connected to one end of the current balancing sheet of the current balancing component and a second connector connected to the other end of the current balancing sheet of the current balancing component; and the current balancing control of the current of the group of abnormal guide rods by using the at least one current balancing component includes: Connecting the first connector of the first current balancing component to the first abnormal guide rod, and connecting the second connector of the first current balancing component to the second abnormal guide rod; After the connection is completed, monitoring the current anode equidistant pressure drop of the first abnormal conductor and the current anode equidistant pressure drop of the second abnormal conductor; If the current anode equidistant pressure drop of the first abnormal guide rod is within the preset pressure drop range, and the current anode equidistant pressure drop of the second abnormal guide rod is within the preset pressure drop range, disconnect the first current balancing component from the first abnormal guide rod and the second abnormal guide rod.

6. The cell voltage control method of an electrolytic cell according to claim 3, characterized in that: The group of abnormal guide rods includes a first abnormal guide rod, a second abnormal guide rod, and a third abnormal guide rod, wherein the anode equidistant pressure drop of the first abnormal guide rod is greater than the upper limit of the preset pressure drop range, the anode equidistant pressure drop of the second abnormal guide rod is less than the lower limit of the preset pressure drop range, and the anode equidistant pressure drop of the third abnormal guide rod is less than the lower limit of the preset pressure drop range; The step of selecting at least one current balancing component for the group of abnormal guide rods from a plurality of current balancing components comprises: Determining a first target current compensation amount from the first abnormal conductor to the second abnormal conductor, and a second target current compensation amount from the first abnormal conductor to the third abnormal conductor, based on a voltage drop deviation between the anode equidistant voltage drop of the first abnormal conductor and the anode equidistant voltage drop of the second abnormal conductor, and a voltage drop deviation between the anode equidistant voltage drop of the first abnormal conductor and the anode equidistant voltage drop of the third abnormal conductor; determining a first target cross-sectional area based on the first target current compensation amount; determining a second target cross-sectional area based on the second target current compensation amount; Among the multiple current balancing components, the current balancing component whose current balancing sheet cross-sectional area is the first target cross-sectional area is used as the first current balancing component; among the multiple current balancing components, the current balancing component whose current balancing sheet cross-sectional area is the second target cross-sectional area is used as the second current balancing component; the at least one current balancing component includes the first current balancing component and the second current balancing component.

7. The cell voltage control method of an electrolytic cell according to claim 6, characterized in that: Each of the current balancing components further includes a first connector connected to one end of the current balancing sheet of the current balancing component and a second connector connected to the other end of the current balancing sheet of the current balancing component; and the current balancing control of the current of the group of abnormal guide rods by using the at least one current balancing component includes: Connect the first connector of the first current balancing assembly to the first abnormal guide rod, and connect the second connector of the first current balancing assembly to the second abnormal guide rod; connect the first connector of the second current balancing assembly to the first abnormal guide rod, and connect the second connector of the second current balancing assembly to the third abnormal guide rod; After the connection is completed, monitoring the current anode equidistant pressure drop of the first abnormal conductor, the current anode equidistant pressure drop of the second abnormal conductor, and the current anode equidistant pressure drop of the third abnormal conductor; If the current anode equidistant pressure drop of the first abnormal guide rod is within the preset pressure drop range, the current anode equidistant pressure drop of the second abnormal guide rod is within the preset pressure drop range, and the current anode equidistant pressure drop of the third abnormal guide rod is within the preset pressure drop range, disconnect the first current balancing component from the first abnormal guide rod and the second abnormal guide rod, and disconnect the second current balancing component from the first abnormal guide rod and the third abnormal guide rod.

8. The method for controlling the cell voltage of an electrolytic cell according to any one of claims 3 to 7, characterized in that: When the current balancing component is connected to the abnormal guide rod, the distance between the current balancing component and the steel claw used to connect the corresponding anode is 500mm to 1000mm, and the angle between the current balancing component and the liquid surface of the electrolyte in the electrolytic cell is 0 degrees to 60 degrees.

9. A cell voltage control device for an electrolytic cell, characterized in that: The electrolytic cell comprises a plurality of anodes and a plurality of anode guide rods, wherein each anode is provided with an anode guide rod, and the device comprises: A voltage acquisition unit, used to acquire the cell voltage of the electrolytic cell; a voltage drop obtaining unit, configured to obtain an anode equidistant voltage drop of each anode guide rod of the plurality of anode guide rods if a deviation between a cell voltage of the electrolytic cell and a preset voltage threshold is greater than a preset deviation threshold; a selection unit configured to select a plurality of abnormal anode guide rods from the plurality of anode guide rods based on the anode equidistant pressure drop of each anode guide rod among the plurality of anode guide rods, wherein the anode equidistant pressure drop of each anode guide rod among the plurality of abnormal anode guide rods exceeds a preset pressure drop range; A current balancing control unit is used to perform current balancing control on the currents of the multiple abnormal guide rods to reduce the cell voltage fluctuation of the electrolytic cell.

10. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method according to any one of claims 1 to 8 when executing the computer program.

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