Electrolytic bath cathode conductive opening and closing control method, opening and closing device and electrolytic bath equipment

Abstract

The invention relates to the technical field of electrolysis equipment, in particular to an electrolytic bath cathode conductive opening and closing control method, an opening and closing device and electrolytic bath equipment. The electrolytic bath cathode conductive opening and closing control method comprises the steps that in the anode carbon block set replacement process, a circuit between a corresponding cathode carbon block set and a cathode bus is disconnected, so that no current flows to the cathode carbon block set corresponding to the anode carbon block set needing to be replaced, and after the anode carbon block set is replaced, the cathode bus is connected with the cathode carbon block set. A circuit between the corresponding cathode carbon block group and the cathode bus is closed, and normal through-flow is ensured; therefore, local voltage fluctuation caused by replacement of the anode carbon block group can be avoided, and power consumption can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of electrolytic equipment, and in particular to an electrolytic cell cathode conductive opening and closing control method, an opening and closing device and electrolytic cell equipment. Background Art

[0002] The electricity cost of electrolytic aluminum accounts for a large proportion, accounting for about 40% of the total cost of electrolytic aluminum. As the requirements for energy conservation and emission reduction become more and more stringent, electrolytic aluminum enterprises pay more and more attention to reducing the energy consumption of aluminum electrolytic cells. The conductive parts of aluminum electrolytic cell equipment are mainly composed of anode conductive structure and cathode conductive structure. The anode conductive structure includes anode busbar and anode carbon block group. The anode carbon block group includes aluminum guide rod, anode steel claw and anode carbon block. The cathode conductive structure includes cathode carbon block group, steel aluminum explosion block, cathode aluminum soft belt and cathode busbar. The cathode carbon block group is one of the core components of prebaked aluminum electrolytic cell. The mainstream electrolytic cell type is that each electrolytic cell contains 20-30 groups of cathode carbon block groups. Usually, each group of cathode carbon block groups corresponds to one group of anode carbon block groups, and the anode carbon block group is located above the corresponding cathode carbon block group. The traditional cathode carbon block group is mainly composed of cathode carbon block, cathode conductive rod and ramming paste / phosphorus pig iron. The cathode conductive rod is combined with the cathode carbon block by ramming paste or casting of phosphorus pig iron, and one end of the cathode conductive rod protrudes from the cathode carbon block. In the overall structure of the electrolytic cell, the upper surface of the cathode carbon block supports the molten aluminum liquid, the cathode conductive rod protruding from one end of the cathode carbon block is welded to the steel end of the steel-aluminum explosion block, the aluminum end of the steel-aluminum explosion block is welded to the cathode aluminum soft belt, and the cathode aluminum soft belt is connected to the cathode busbar. During the electrolytic aluminum production process, the current passes through the anode, electrolyte, aluminum liquid, cathode carbon block, cathode conductive rod, steel-aluminum explosion block, cathode aluminum soft belt, cathode aluminum busbar, and then flows into the anode of the next electrolytic cell.

[0003] During the electrolytic aluminum production process, the anode carbon blocks that sink into the electrolyte will be worn out. Therefore, after a period of operation, the anode carbon block group needs to be replaced, which is also called pole replacement operation. During the pole replacement, the old anode carbon block group is lifted out of the electrolytic cell, and then the new anode carbon block group is lifted and placed in the electrolytic cell. Figure 1, define the old anode carbon block group as the anode carbon block group to be replaced 100, its corresponding cathode carbon block group is defined as the corresponding cathode carbon block group 200, and the anode carbon block group adjacent to the anode carbon block group 100 to be replaced is the adjacent anode carbon block group 101. After the anode carbon block group 100 to be replaced is lifted off the cell shell 1 of the electrolytic cell, the corresponding cathode carbon block group 200 loses the anode carbon block group corresponding to it above and below. At this time, there is no vertical current between the corresponding cathode carbon block group 200 and its corresponding anode carbon block group, but the corresponding cathode carbon block group 200 and its corresponding A deflection current is generated between another adjacent anode carbon block group 101 of the anode carbon block group, that is, the original vertical current between the anode carbon block group 100 to be replaced and the corresponding cathode carbon block group 200 is changed into a deflection current between the adjacent anode carbon block group 101 and the corresponding cathode carbon block group 200, and the current path is changed from vertical to inclined, and the current path changes, causing voltage fluctuations, and under the influence of the magnetic field generated by the current, local aluminum liquid and electrolyte will surge, causing local voltage fluctuations and a larger voltage drop, thereby resulting in an increase in power consumption. Summary of the invention

[0004] The object of the present invention is to provide a method for controlling the opening and closing of the cathode conductivity of an electrolytic cell, so as to solve the problem of increased power consumption due to voltage fluctuations when changing poles in the current electrolytic cell; the object of the present invention is also to provide an electrolytic cell cathode conductive opening and closing device and electrolytic cell equipment, so as to solve the above-mentioned problem.

[0005] The technical solution of the electrolytic cell cathode conductive opening and closing control method of the present invention is: The method for controlling the opening and closing of the cathode conductivity of an electrolytic cell comprises: disconnecting the circuit between the corresponding cathode carbon block group and the cathode busbar during the replacement of the anode carbon block group, and closing the circuit between the corresponding cathode carbon block group and the cathode busbar after the replacement of the anode carbon block group is completed.

[0006] Beneficial effects: The present invention pioneers a method for controlling the cathode conductivity opening and closing of an electrolytic cell to prevent increased power consumption during pole change. During replacement of the anode carbon block group, the circuit between the corresponding cathode carbon block group and the cathode busbar is disconnected, so that no current flows to the cathode carbon block group corresponding to the anode carbon block group that needs to be replaced. After the replacement of the anode carbon block group is completed, the circuit between the corresponding cathode carbon block group and the cathode busbar is closed to ensure normal current flow. This can avoid local voltage fluctuations caused by replacement of the anode carbon block group, which is beneficial to reducing power consumption.

[0007] Furthermore, after the anode carbon block group is replaced, a set time is waited, and then the circuit between the corresponding cathode carbon block group and the cathode busbar is closed.

[0008] Furthermore, after the circuit between the corresponding cathode carbon block group and the cathode busbar is closed, the voltage between the replaced anode carbon block group and the corresponding cathode carbon block group is detected. When the voltage fluctuation exceeds the set range, the circuit between the corresponding cathode carbon block group and the cathode busbar continues to be disconnected. Otherwise, the circuit is kept closed.

[0009] Furthermore, during the replacement of the anode carbon block group, the voltage between the anode carbon block group to be replaced and the corresponding cathode carbon block group is detected, and when the voltage exceeds a set value, the circuit is disconnected.

[0010] Furthermore, the voltage signal between the anode carbon block group to be replaced and the corresponding cathode carbon block group is transmitted to the corresponding control device. When the control device determines that the voltage exceeds the set value, the opening and closing mechanism on the circuit is controlled to disconnect the circuit.

[0011] Furthermore, the circuit is disconnected by disconnecting the conductive connection between the cathode soft belt and the cathode conductive rod through the opening and closing device.

[0012] The technical solution of the electrolytic cell cathode conductive opening and closing device of the present invention is: The electrolytic cell cathode conductive opening and closing device comprises an opening and closing mechanism, which comprises a mounting seat, a static contact fixedly arranged on the mounting seat and a moving contact movably arranged on the mounting seat, the moving contact is provided with a moving side connection structure for conductively connecting the cathode carbon block group and one of the cathode busbars through a flexible connection structure, the static contact is provided with a static side connection structure for conductively connecting the cathode carbon block group and the other of the cathode busbars through a fixed connection structure, and the moving contact has a separation position for separating from the static contact when replacing the anode carbon block group and a joining position for joining with the static contact after the anode carbon block group is replaced in its movable stroke.

[0013] Beneficial effects: The present invention pioneers a cathode conductive opening and closing device for an electrolytic cell that prevents increased power consumption during pole change. The static contact and the moving contact of the opening and closing device are separated and engaged to realize the circuit disconnection and closing between the corresponding cathode carbon block group and the cathode busbar. In this way, during the replacement of the anode carbon block group, the circuit between the corresponding cathode carbon block group and the cathode busbar is disconnected, so that no current flows to the cathode carbon block group corresponding to the anode carbon block group that needs to be replaced. After the replacement of the anode carbon block group is completed, the circuit between the corresponding cathode carbon block group and the cathode busbar is closed to ensure normal current flow. In this way, local voltage fluctuations caused by the replacement of the anode carbon block group can be avoided, which is beneficial to reducing power consumption.

[0014] Furthermore, the opening and closing mechanism includes a driving device for driving the movable contact to move, and the cathode conductive opening and closing device of the electrolytic cell also includes a control device for controlling the driving device to move.

[0015] Furthermore, the mounting seat covers the conductive parts of the moving contact and the stationary contact.

[0016] The technical solution of the electrolytic cell equipment of the present invention is: The electrolytic cell equipment includes an electrolytic cell cathode conductive opening and closing device, which includes an opening and closing mechanism. The opening and closing mechanism includes a mounting seat, a static contact fixedly arranged on the mounting seat, and a moving contact movably arranged on the mounting seat. The moving contact is provided with a moving side connection structure for conductively connecting the cathode carbon block group and one of the cathode busbars through a flexible connection structure, and the static contact is provided with a static side connection structure for conductively connecting the cathode carbon block group and the other of the cathode busbars through a fixed connection structure. The moving contact has a separation position on its movable stroke for separating from the static contact when replacing the anode carbon block group and a coupling position for coupling with the static contact after the anode carbon block group is replaced.

[0017] Beneficial effects: The present invention pioneers an electrolytic cell device that prevents increased power consumption during pole change. The static contact and the moving contact of the opening and closing device are separated and engaged to realize the circuit disconnection and closing between the corresponding cathode carbon block group and the cathode busbar. In this way, during the replacement of the anode carbon block group, the circuit between the corresponding cathode carbon block group and the cathode busbar is disconnected, so that no current flows to the cathode carbon block group corresponding to the anode carbon block group that needs to be replaced. After the replacement of the anode carbon block group is completed, the circuit between the corresponding cathode carbon block group and the cathode busbar is closed to ensure normal current flow. In this way, local voltage fluctuations caused by the replacement of the anode carbon block group can be avoided, which is beneficial to reducing power consumption.

[0018] Furthermore, the opening and closing mechanism includes a driving device for driving the movable contact to move, and the cathode conductive opening and closing device of the electrolytic cell also includes a control device for controlling the driving device to move.

[0019] Furthermore, the mounting seat covers the conductive parts of the moving contact and the stationary contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the arrangement positions of the anode carbon block group and the cathode carbon block group of the electrolytic cell; Figure 2 A schematic diagram of an electrolytic cell device according to an embodiment of the present invention; Figure 3 for Figure 2 Schematic diagram of the connection structure between the cathode conductive opening and closing device of the electrolytic cell and the corresponding components of the cathode conductive structure.

[0021] In the figure: 100, the anode carbon block group to be replaced; 200, the corresponding cathode carbon block group; 101, the adjacent anode carbon block group; 1. Tank shell; 2. Cathode carbon block; 3. Consolidation body; 4. Cathode steel rod; 5. Copper rod; 6. Copper-aluminum connection structure; 7. Fixed aluminum block; 8. Movable aluminum block; 9. Cathode aluminum soft belt; 10. Cathode aluminum busbar; 11. Mounting seat; 12. Fixed plate; 13. Movable plate; 14. Driving device; 15. Control cabinet; 16. Signal line. DETAILED DESCRIPTION

[0022] The method for controlling the opening and closing of the cathode conductivity of the electrolytic cell of the present invention disconnects the circuit between the corresponding cathode carbon block group and the cathode busbar during the process of replacing the anode carbon block group, so that no current flows to the cathode carbon block group corresponding to the anode carbon block group that needs to be replaced. After the replacement of the anode carbon block group is completed, the circuit between the corresponding cathode carbon block group and the cathode busbar is closed to ensure normal current flow; this can avoid local voltage fluctuations caused by the replacement of the anode carbon block group, which is beneficial to reducing power consumption.

[0023] The electrolytic cell equipment of the present invention is described in detail below in conjunction with an embodiment.

[0024] Embodiments of the electrolyzer apparatus of the present invention: The electrolytic cell equipment includes an electrolytic cell cathode conductive opening and closing device which can open and close the circuit between the cathode carbon block group and the cathode busbar. The electrolytic cell cathode conductive opening and closing device includes an opening and closing mechanism. The opening and closing mechanism includes a mounting seat, a static contact fixedly arranged on the mounting seat and a moving contact movably arranged on the mounting seat. The moving contact is provided with a moving side connection structure which is used to conductively connect the cathode carbon block group and one of the cathode busbars through a flexible connection structure. The static contact is provided with a static side connection structure which is used to conductively connect the cathode carbon block group and the other of the cathode busbars through a fixed connection structure. The moving contact has a separation position on its movable stroke for separating from the static contact when replacing the anode carbon block group and a coupling position for coupling with the static contact after the anode carbon block group is replaced. By separating and engaging the static contacts and the moving contacts of the opening and closing device, the circuit between the corresponding cathode carbon block group and the cathode busbar can be opened and closed. In this way, during the replacement of the anode carbon block group, the circuit between the corresponding cathode carbon block group and the cathode busbar is disconnected, so that no current flows to the cathode carbon block group corresponding to the anode carbon block group that needs to be replaced, which can avoid local voltage fluctuations caused by the replacement of the anode carbon block group, thereby reducing power consumption.

[0025] Specifically, Figure 1 , Figure 2 , Figure 3As shown, the electrolytic cell equipment includes a cell shell 1, an anode carbon block group, a cathode carbon block group, an electrolytic cell cathode conductive opening and closing device, a cathode aluminum soft belt 9, and a cathode aluminum busbar 10. Two rows of cathode carbon block groups are arranged in the width direction of the cell shell 1, and the cathode carbon block groups in the same row are arranged at intervals along the length direction of the cell shell 1. Correspondingly, two rows of anode carbon block groups are arranged in the width direction of the cell shell 1, and the anode carbon block groups in the same row are arranged at intervals along the length direction of the cell shell 1. When the anode carbon block groups are used, they enter the electrolyte in the cell shell 1. The anode carbon block groups correspond to the cathode carbon block groups one by one, and a corresponding anode carbon block group is arranged above each cathode carbon block group, so as to form a vertical current between the cathode carbon block group and the corresponding anode carbon block group. The cathode carbon block group includes a cathode carbon block 2, a consolidation body 3, a cathode steel rod 4, and a copper rod 5. The upper surface of the cathode carbon block 2 is used to support molten aluminum liquid. The consolidation body 3 is a ramming paste or phosphorus pig iron. The cathode steel rod 4 is combined with the cathode carbon block by ramming the ramming paste or pouring the phosphorus pig iron. The cathode steel rod 4 is embedded with the copper rod 5 to form a cathode conductive rod. The high conductivity of the copper material is used to reduce the circuit voltage to achieve the purpose of saving electricity. One end of the copper rod 5 is flush with one end of the corresponding cathode steel rod 4 and protrudes from the cathode carbon block 2. The copper-aluminum connection structure 6 is welded on the end face of the copper rod 5 protruding from one end of the cathode carbon block 2 of the cathode conductive rod. The copper-aluminum connection structure 6 is connected to the cathode aluminum soft belt 9 through the opening and closing mechanism of the cathode conductive opening and closing device of the electrolytic cell. The cathode aluminum soft belt 9 is connected to the cathode aluminum busbar 10. In the electrolytic aluminum production process, the current flows into the cathode aluminum soft belt 9 and the cathode aluminum busbar 10 through the anode, the electrolyte, the aluminum liquid, the cathode carbon block, the cathode conductive rod, and the copper-aluminum connection structure 6 in sequence.

[0026] The cathode conductive opening and closing device of the electrolytic cell includes several opening and closing mechanisms, and each cathode carbon block group is equipped with an opening and closing mechanism. The opening and closing mechanism includes a mounting seat 11, a moving contact, a static contact and a driving device 14. The mounting seat 11 can be fixed on the ground or the tank shell 1 through a corresponding bracket. The mounting seat 11 is fixed when in use, the static contact is fixedly arranged on the mounting seat 11, and the moving contact is movably arranged on the mounting seat 11. The driving device 14 is used to drive the moving contact to move so that the moving contact and the static contact are engaged and separated. The moving contact includes a movable plate 13 and a movable aluminum block 8 fixed on the movable plate 13, and the movable plate 13 and the movable aluminum block 8 can move relative to the mounting seat 11 as a whole. The static contact includes a fixed plate 12 and a fixed aluminum block 7 fixed on the fixed plate 12, and the fixed plate 12 and the fixed aluminum block 7 are fixed relative to the mounting seat 11 as a whole. The movable aluminum block 8 is connected to the cathode aluminum soft belt 9, and the fixed aluminum block 7 is connected to the copper-aluminum connection structure 6. The movable contact has a separation position for separating from the static contact when replacing the corresponding anode carbon block group and a connection position for connecting with the static contact after the replacement of the anode carbon block group is completed. During the replacement of the anode carbon block group, the circuit between the corresponding cathode carbon block group and the cathode busbar is disconnected, so that no current flows to the cathode carbon block group corresponding to the anode carbon block group to be replaced. After the replacement of the anode carbon block group is completed, the circuit between the corresponding cathode carbon block group and the cathode busbar is closed to ensure normal current flow, which can avoid local voltage fluctuations caused by the replacement of the anode carbon block group and is conducive to reducing power consumption.

[0027] The cathode aluminum soft strip 9 is the cathode soft strip, and the cathode aluminum busbar 10 is the cathode busbar. The cathode aluminum soft strip 9 constitutes a flexible connection structure to form a flexible conductive connection between the movable aluminum block 8 and the cathode aluminum busbar 10, and the portion of the movable aluminum block 8 used to connect the cathode aluminum soft strip 9 constitutes a moving side connection structure. The copper-aluminum connection structure 6 can adopt a copper-aluminum composite sheet or a copper-aluminum explosion welding block. The copper-aluminum connection structure 6 constitutes a fixed connection structure to make the fixed aluminum block 7 conductively connected to the cathode carbon block group, and the portion of the fixed aluminum block 7 used to connect the copper-aluminum connection structure 6 constitutes a static side connection structure. In other embodiments, the opening and closing mechanism can also be connected between the cathode aluminum soft strip 9 and the cathode aluminum busbar 10, so that the copper-aluminum connection structure 6 is connected to the cathode aluminum soft strip 9, the cathode aluminum soft strip 9 is connected to the movable aluminum block 8, and the fixed aluminum block 7 is fixedly connected to the cathode aluminum busbar 10.

[0028] The mounting seat 11 includes a horizontal plate and a vertical plate fixed to one end of the horizontal plate. The upper end of the fixed plate 12 is fixed to the other end of the horizontal plate. The fixed plate 12 is suspended downward. The movable plate 13 is located between the fixed plate 12 and the vertical plate of the mounting seat 11. A slide rail is provided on the horizontal plate of the mounting seat 11. The upper end of the movable plate 13 is slidably arranged on the slide rail so as to guide and limit the movable plate 13 by means of the slide rail. The driving device 14 is an electric push rod. The fixed part of the electric push rod is fixed to the vertical plate of the mounting seat 11, and the movable part passes through the vertical plate of the mounting seat 11 to be fixedly connected to the movable plate 13. The electric push rod can drive the movable plate 13 and the movable aluminum block 8 to move relative to the fixed aluminum block 7. The movable aluminum block 8 and the fixed aluminum block 7 do not contact the mounting seat 11. The movable plate 13 and the fixed plate 12 can be made of insulating materials to disconnect the circuit when the movable aluminum block 8 is separated from the fixed aluminum block 7. When the movable aluminum block 8 is separated from the fixed aluminum block 7, they are spaced and opposite to each other in the width direction of the tank shell 1. The driving device 14 is arranged on the side of the movable aluminum block 8 away from the tank shell 1. The movable aluminum block 8 contacts the opposite side of the fixed aluminum block 7 to close the circuit. The opposite sides of the movable aluminum block 8 and the fixed aluminum block 7 are respectively connected to the cathode aluminum soft belt 9 and the copper-aluminum connection structure 6. The mounting seat 11 covers the conductive parts of the moving contact and the static contact, and the conductive part is an aluminum block to protect the aluminum block. In other embodiments, the moving contact and the static contact can also be arranged up and down.

[0029] The cathode conductive opening and closing device of the electrolytic cell also includes a control device for controlling the drive device 14 to perform actions. The control device is a control cabinet 15. The drive devices 14 of each opening and closing mechanism are connected to the control cabinet 15 via a signal line 16. The control cabinet 15 transmits a signal to the drive device 14 via the signal line 16 to control the opening and closing of the corresponding drive device 14. The electrolytic cell equipment includes a voltage detection device for detecting the voltage between the anode carbon block group and the cathode carbon block group. The technology for detecting the voltage between the anode and the cathode is a conventional technology for the electrolytic cell and will not be repeated here. The voltage detection device can transmit the voltage signal to the control cabinet 15, and the control cabinet 15 judges the received signal to control the corresponding drive device 14 to perform actions. The opening and closing device can disconnect the conductive connection between the cathode soft belt and the cathode conductive rod to achieve the circuit disconnection between the corresponding cathode carbon block group and the cathode busbar.

[0030] When replacing the anode carbon block group, the old anode carbon block group is lifted out of the electrolytic cell, and then the new anode carbon block group is lifted and placed in the electrolytic cell. Figure 1, the anode carbon block group to be replaced is the anode carbon block group 100 to be replaced, the cathode carbon block group corresponding to the anode carbon block group 100 to be replaced is the corresponding cathode carbon block group 200, and the other anode carbon block group adjacent to the anode carbon block group 100 to be replaced is the adjacent anode carbon block group 101. During the replacement of the anode carbon block group, the anode carbon block group 100 to be replaced is lifted. At this time, no vertical current passes between the anode carbon block group 100 to be replaced and the corresponding cathode carbon block group 200, and a deflection current will be generated between the corresponding cathode carbon block group 200 and the adjacent anode carbon block group 101. Under the influence of the magnetic field, the local aluminum liquid and the electrolyte will fluctuate, which will cause local voltage fluctuations. At this time, the corresponding opening and closing mechanism is controlled by the control cabinet 15 to separate the fixed aluminum block 7 and the movable aluminum block 8, thereby disconnecting the circuit between the corresponding cathode carbon block group 200 and the cathode busbar, so that no current flows to the corresponding cathode carbon block group 200, reducing local voltage fluctuations. In order to facilitate automatic control of the opening and closing mechanism, the voltage between the anode carbon block group 100 to be replaced and the corresponding cathode carbon block group 200 can be detected, and the voltage signal can be transmitted to the corresponding control cabinet 15. The control cabinet 15 is provided with a processor that can execute the corresponding program. The control cabinet 15 judges the signal. When the voltage exceeds the set value, a control signal is sent to the drive device 14 through the signal line 16 to disconnect the corresponding circuit. After the replacement of the anode carbon block group is completed, the control cabinet 15 controls the corresponding opening and closing mechanism to engage the fixed aluminum block 7 and the movable aluminum block 8, thereby closing the circuit between the corresponding cathode carbon block group 200 and the cathode busbar.

[0031] After the anode carbon block group is replaced, the new anode carbon block group enters the electrolyte, and current is passed through the anode. Since the temperature of the anode carbon block of the anode carbon block group is still relatively low and the anode carbon block has not reached the working temperature, the current will not pass through the anode carbon block for a period of time after entering the electrolyte. As the temperature of the anode carbon block rises, current will be passed through the anode carbon block. There is also voltage fluctuation in this process. At this time, the opening and closing device can be used to keep the circuit between the corresponding cathode carbon block group 200 and the cathode busbar disconnected, and then closed after a period of time, that is, waiting for the set time until the anode carbon block reaches the working temperature (or may be close to the working temperature), there is a period of time, and then the circuit between the corresponding cathode carbon block group and the cathode busbar is closed. The control cabinet can judge by voltage fluctuation. After closing the circuit between the corresponding cathode carbon block group 200 and the cathode busbar, it can judge whether it can be kept closed by voltage fluctuation. The voltage between the replaced anode carbon block group and the corresponding cathode carbon block group 200 is detected. When the voltage fluctuation is severe and exceeds the set range, the circuit between the corresponding cathode carbon block group 200 and the cathode busbar is continued to be disconnected. Otherwise, the circuit is kept closed. At this time, the voltage does not fluctuate or is in a stable state, and the disconnection operation is no longer performed. This process can also reduce voltage fluctuations, thereby reducing energy consumption. Voltage fluctuations can be observed on the control cabinet.

[0032] For the conventional pole-changing method of maintaining the circuit conduction between the cathode carbon block group and the cathode busbar, the voltage fluctuation generated during the entire pole-changing process is about 20-30mV. The electrolytic cell equipment of the present invention can disconnect the circuit between the corresponding cathode carbon block group and the cathode busbar when changing poles, avoiding voltage fluctuations caused by current deviation during pole changing. The corresponding ton of aluminum can save 60-90kWh of electricity. Based on an electrolytic aluminum enterprise with an annual output of 500,000 tons, at least 30 million kilowatt-hours of electricity can be saved each year.

[0033] Embodiments of the electrolytic cell cathode conductive opening and closing device of the present invention: The electrolytic cell cathode conductive opening and closing device in this embodiment is the same as the electrolytic cell cathode conductive opening and closing device in the above-mentioned electrolytic cell equipment embodiment, and will not be described in detail here.

[0034] Embodiment of the electrolytic cell cathode conductive opening and closing control method of the present invention: The cathode conductive opening and closing control method of the electrolytic cell includes: during the replacement of the anode carbon block group, the circuit between the corresponding cathode carbon block group and the cathode busbar is disconnected, and after the replacement of the anode carbon block group is completed, the circuit between the corresponding cathode carbon block group and the cathode busbar is closed. This avoids local voltage fluctuations caused by the replacement of the anode carbon block group, which is conducive to reducing power consumption.

[0035] After the anode carbon block group is replaced, wait for a set time, and then close the circuit between the corresponding cathode carbon block group and the cathode busbar. After the circuit between the corresponding cathode carbon block group and the cathode busbar is closed, detect the voltage between the replaced anode carbon block group and the corresponding cathode carbon block group. When the voltage fluctuation exceeds the set range, continue to disconnect the circuit between the corresponding cathode carbon block group and the cathode busbar. Otherwise, keep the circuit closed. In other embodiments, the circuit can also be closed only by a suitable set time.

[0036] During the replacement of the anode carbon block group, the voltage between the anode carbon block group to be replaced and the corresponding cathode carbon block group is detected, and when the voltage exceeds the set value, the circuit between the corresponding cathode carbon block group and the cathode busbar is disconnected. Of course, in other embodiments, manual control is also possible.

[0037] The electrolytic cell equipment includes an electrolytic cell cathode conductive opening and closing device, which includes a control device and an opening and closing mechanism arranged on the circuit between the cathode carbon block group and the cathode busbar. When changing poles, the voltage signal between the anode carbon block group to be replaced and the corresponding cathode carbon block group is transmitted to the corresponding control device. When the control device determines that the voltage exceeds the set value, it controls the opening and closing mechanism on the corresponding circuit to perform a disconnection action to disconnect the circuit. The corresponding opening and closing device can disconnect the conductive connection between the cathode soft belt and the cathode conductive rod to achieve circuit disconnection. The cathode soft belt is connected to the cathode busbar, and the cathode conductive rod belongs to the cathode carbon block group. A fracture is set between the cathode soft belt and the cathode conductive rod for easy layout.

[0038] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for controlling the opening and closing of the cathode conductive device of an electrolytic cell, characterized in that: During the replacement of the anode carbon block group, the circuit between the corresponding cathode carbon block group and the cathode busbar is disconnected, and after the replacement of the anode carbon block group is completed, the circuit between the corresponding cathode carbon block group and the cathode busbar is closed.

2. The method for controlling the opening and closing of the cathode conductive state of an electrolytic cell according to claim 1, wherein: After the anode carbon block group is replaced, wait for a set time, and then close the circuit between the corresponding cathode carbon block group and the cathode busbar.

3. The method for controlling the opening and closing of the cathode conductive state of an electrolytic cell according to claim 2, wherein: After closing the circuit between the corresponding cathode carbon block group and the cathode busbar, detect the voltage between the replaced anode carbon block group and the corresponding cathode carbon block group. When the voltage fluctuation exceeds the set range, continue to disconnect the circuit between the corresponding cathode carbon block group and the cathode busbar. Otherwise, keep the circuit closed.

4. The method for controlling the opening and closing of the cathode conduction of an electrolytic cell according to claim 1, 2 or 3, characterized in that: During the replacement of the anode carbon block group, the voltage between the anode carbon block group to be replaced and the corresponding cathode carbon block group is detected, and when the voltage exceeds a set value, the circuit is disconnected.

5. The method for controlling the opening and closing of the cathode conductive state of an electrolytic cell according to claim 4, wherein: The voltage signal between the anode carbon block group to be replaced and the corresponding cathode carbon block group is transmitted to the corresponding control device. When the control device determines that the voltage exceeds the set value, the opening and closing mechanism on the circuit is controlled to disconnect the circuit.

6. The method for controlling the opening and closing of the cathode conduction of an electrolytic cell according to claim 1, 2 or 3, characterized in that: The circuit is disconnected by disconnecting the cathode soft belt from the cathode conductive rod through the opening and closing device.

7. An electrolytic cell cathode conductive opening and closing device, characterized in that: The invention comprises an opening and closing mechanism, which comprises a mounting seat, a static contact fixedly arranged on the mounting seat and a moving contact movably arranged on the mounting seat, the moving contact is provided with a moving side connection structure for conductively connecting the cathode carbon block group and one of the cathode busbars through a flexible connection structure, the static contact is provided with a static side connection structure for conductively connecting the cathode carbon block group and the other of the cathode busbars through a fixed connection structure, and the moving contact has a separation position for separating from the static contact when replacing the anode carbon block group and a joining position for joining with the static contact after the anode carbon block group is replaced in its movable stroke.

8. The electrolytic cell cathode conductive opening and closing device according to claim 7 is characterized in that: The opening and closing mechanism includes a driving device for driving the movable contact to move, and the cathode conductive opening and closing device of the electrolytic cell also includes a control device for controlling the driving device to move.

9. The electrolytic cell cathode conductive opening and closing device according to claim 7, characterized in that: The mounting seat covers the conductive parts of the moving contact and the stationary contact.

10. An electrolytic cell device, characterized in that: The invention comprises the electrolytic cell cathode conductive opening and closing device as described in any one of claims 7 to 9.

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