A separator for use in the changing of electrodes in electrolytic cells

Abstract

The utility model belongs to the field of electrolytic aluminium, specifically provides a kind of isolating device for electrolytic cell polarity change. The isolating device includes top isolating cover, and the lower end of top isolating cover is equipped with the movable isolating cover that can be retracted, and top isolating cover is used to assemble on polarity change headstock gear and moves with polarity change headstock gear, and movable isolating cover is enclosed after being lowered and is formed to meet the isolating space of more than one electrolytic cell of sunshade, and the communication port for being communicated with purification device is equipped on top isolating cover, to when carrying out polarity change operation, the air in the inside of isolating space is purified by purification device. When the above-mentioned isolating device is applied to carry out polarity change operation, the isolating space formed after movable isolating cover is lowered can completely isolate the electrolytic cell needing polarity change, and the air in the isolating space can be purified by starting purification device, to avoid the unorganized emission of hot flue gas after the opening of the gas-collecting cover plate of electrolytic cell, and solve the technical problem that hot flue gas emission affects personnel health and environmental protection.

Description

Technical Field

[0001] This utility model belongs to the field of electrolytic aluminum, and in particular relates to an isolation device for electrode switching in electrolytic cells. Background Technology

[0002] In the electrolytic aluminum production process, the carbon block of the anode guide rod will burn out and become a residual electrode after a period of use (usually 25-30 days), requiring replacement. Currently, a multi-functional electrode-changing overhead crane is typically used for anode replacement. The overhead crane has an electrode-changing cart and an electrode-changing mechanism. The overhead crane can move along the arrangement of the electrolytic cells in the workshop from the top of the electrolytic cell building, moving the electrode-changing cart between different electrolytic cells to switch positions. The electrode-changing cart can move along the length of the electrolytic cell on the overhead crane, moving the electrode-changing mechanism between different anodes to switch positions. The electrode-changing mechanism has a vertically movable electrode-changing output end, which can lift out the residual electrode and install the new electrode, completing the anode replacement.

[0003] When replacing the anode, the gas collection hood near the replacement location needs to be opened, exposing the electrolyte and releasing hot and harmful gases into the air. Current technologies are generally ineffective in preventing the emission of this hot flue gas, which is detrimental to human health and the environment. Utility Model Content

[0004] The purpose of this invention is to provide an isolation device for electrode switching in electrolytic cells, so as to solve the technical problem that the hot flue gas emissions during electrode switching in electrolytic cells affect human health and the environment.

[0005] To achieve the above objectives, the technical solution of the isolation device for electrode switching in an electrolytic cell provided by this utility model is as follows: An isolation device for electrode changing in an electrolytic cell includes a top isolation cover and a retractable movable isolation cover at the lower end of the top isolation cover. The top isolation cover is used to be mounted on an electrode changing trolley and moves with the electrode changing trolley. After being lowered, the movable isolation cover encloses an isolation space that can cover one or more electrolytic cells. A communication port is provided on the top isolation cover for communicating with a purification device so that the air inside the isolation space can be purified by the purification device during electrode changing operations.

[0006] As a further improvement, the movable isolation cover includes four roller blind mechanisms connected to the four sides of the top isolation cover. Each roller blind mechanism includes a roller and a curtain, so as to drive the curtain to be rolled up and down by rotating the roller. The curtain is provided with curtain connecting structures at both ends in the horizontal direction, so as to connect with the curtains of the adjacent roller blind mechanisms at both ends through the curtain connecting structures.

[0007] As a further improvement, the curtain connection structure is a magnetic structure.

[0008] As a further improvement, the curtain connection structure is a zipper structure.

[0009] As a further improvement, a counterweight bar is provided at the lower end of the curtain.

[0010] As a further improvement, the curtain fabric is made of glass fiber-based composite fabric or polyester fire-resistant fabric.

[0011] As a further improvement, a drive motor is provided for the roller, and the roller shutter mechanism constitutes an electric roller shutter.

[0012] As a further improvement, the dimensions of the movable isolation cover along the direction of the electrolytic cells in the workshop are configured such that when it is lowered, it forms an isolation space that can cover more than two electrolytic cells.

[0013] This utility model innovatively provides an isolation device that can be used in an electrolytic cell electrode-changing overhead crane. Its beneficial effects are: when applied to the electrode-changing overhead crane, the top isolation cover can be installed on the electrode-changing overhead crane and connected to the purification device through the connecting port. The isolation space formed after the movable isolation cover is lowered can completely isolate the electrolytic cell that needs to be electrode-changed. Activating the purification device can purify the air in the isolation space, thereby avoiding the unorganized emission of hot flue gas after the gas collection cover of the electrolytic cell is opened, thus solving the technical problem of hot flue gas emission affecting personnel health and the environment. Attached Figure Description

[0014] Figure 1 This is a front view of the implementation of the isolation device for electrode changing in an electrolytic cell when applied to an electrode changing crane; Figure 2 This is a side view of the embodiment of the isolation device for electrode changing in an electrolytic cell when applied to an electrode changing crane; Figure 3 for Figure 1 A top view of the main frame and pole-changing device of the pole-changing crane.

[0015] Explanation of reference numerals in the attached figures: 1. Workshop / Plant; 2. Purification Unit; 3. Main Frame; 4. Residual Electrolytic Cell; 5. New Electrolytic Cell; 6. Pallet Lifting Mechanism; 7. Roller Shutter Mechanism; 8. Pallet; 9. Pallet Placement Position; 10. Top Isolation Cover; 11. Electrolytic Cell; 12. Residual Electrolytic Cell Beam; 13. Traveling Wheels; 14. Guide Wheels; 15. New Electrolytic Cell Beam; 101. Guide Rail; 301. Crossbeam; 302. Longitudinal Beam; 801. Lifting Unit. Detailed Implementation

[0016] To address the health risks and environmental pollution caused by harmful hot flue gas emitted during electrolytic cell electrode switching, the basic technical concept of this invention is to conduct the entire electrode switching operation within an isolated space. Specifically, it provides an isolation device that can be mounted on an electrode switching crane and moved with it. The isolation device consists of two parts: a top section and a movable section. When lowered, the movable section can completely cover the electrolytic cell, and a purification device is connected to the top section to purify and prevent the uncontrolled emission of harmful hot flue gas.

[0017] Based on the above concept, the present invention will be further described in detail below with reference to the embodiments.

[0018] The electrolytic cell electrode switching isolation device (hereinafter referred to as the isolation device) provided in this embodiment can be applied to, for example... Figure 1 and Figure 2 The electrolytic cell electrode-changing crane shown (hereinafter referred to as the electrode-changing crane) can constitute an electrolytic cell electrode-changing system (hereinafter referred to as the electrode-changing system).

[0019] To facilitate understanding, we will first introduce the electrode-changing overhead crane. The electrode-changing overhead crane can be installed at the top of workshop building 1 in the electrolytic cell workshop. Specifically, the electrode-changing overhead crane includes a main frame 3, which can be understood as the basic frame of the overhead crane or the main beam of the crane. Other parts can be directly or indirectly assembled onto the main frame 3. When the main frame 3 is in use, i.e., when the electrode-changing overhead crane is installed in workshop building 1, the main frame 3 can be arranged on the top of workshop building 1 and can be moved horizontally along the top of workshop building 1. The direction of the horizontal movement of the main frame 3 is parallel to the arrangement direction within the workshop. Figure 2 The left and right directions shown allow the electrode replacement crane to be moved from a certain location to above the electrolytic cell 11 where the anode needs to be replaced. Specifically, a guide rail 101 is provided in the upper part of the workshop 1, and the main frame 3 is equipped with rollers that can move along the guide rail 101. A drive mechanism is also provided on the main frame 3. The specific movement method can refer to the movement method of the existing bridge crane (overhead crane) on the top of the workshop, and no specific restrictions are made here.

[0020] The main frame 3 is equipped with an electrode-changing device, which can be understood as a device for replacing the anode. This device is movable relative to the main frame 3, so that after the main frame 3 moves to the position of the corresponding electrolytic cell 11, the electrode-changing device moves relative to the main frame 3 to the cell number to be replaced. At its most basic level, the electrode-changing device includes an electrode-changing cart. The overall structure of the electrode-changing cart can be consistent with existing technology, specifically including clamps, a torsion mechanism, etc., which can remove the residual electrode and place the new electrode; details will not be provided here.

[0021] like Figures 1-3As shown, the main frame 3 includes two crossbeams 301 and two longitudinal beams 302. The two ends of the crossbeams 301 are connected to the two longitudinal beams 302, and the two ends of the longitudinal beams 302 are connected to the crossbeams 301. In other words, the crossbeams 301 and longitudinal beams 302 together form a closed (U-shaped) frame structure. The extension direction of the crossbeams 301 is configured to be parallel to the length direction of the electrolytic cell 11. Naturally, the longitudinal beams 302 are perpendicular to the crossbeams 301. The relevant traveling mechanism supporting the main frame 3 to move along the top of the workshop building 1 can be mounted on the crossbeams 301. Preferably, the cross-sectional area of ​​the crossbeams 301 can be configured to be larger than the cross-sectional area of ​​the longitudinal beams 302 to improve the strength of the crossbeams 301.

[0022] The isolation device can be mounted on the electrode-changing overhead crane, specifically on the main frame 3. Its function is to provide an isolation space that can isolate the entire electrolytic cell 11 during electrode-changing operations. Specifically, the isolation structure includes a top isolation cover 10 and a movable isolation cover. As the names suggest, the top isolation cover 10 refers to the isolation cover located higher up, and the movable isolation cover refers to the isolation cover that can be moved. More specifically, the movable isolation cover is located at the lower end of the top isolation cover 10 and can be moved up and down. The moving up and down here includes various methods such as lifting, rolling up and unfolding, and folding, as long as it can realize the raising and lowering of the isolation cover.

[0023] After the movable isolation cover is lowered, it can enclose and form an isolation space for shielding the electrolytic cell 11. At its most basic, the isolation space should be sufficient to shield one electrolytic cell 11. However, in practice, to accommodate the replacement of residual electrodes in different electrolytic cells 11, such as... Figure 2 As shown, the isolation space can meet the isolation space of the shield covering two electrolytic cells 11. Correspondingly, the movable isolation shield is located along the direction of electrolytic cell arrangement in the workshop ( Figure 2 The dimensions (in the left and right directions) are lowered to form an isolation space that can cover two electrolytic cells. Of course, if the space in the workshop 1 is sufficient, the isolation space can be larger to cover three or even more electrolytic cells 11.

[0024] The main frame 3 adopts a "U"-shaped frame structure, which can provide more space for mounting isolation devices, thereby meeting the requirement of mounting larger isolation devices to facilitate on-site operations.

[0025] The electrode replacement system, by configuring an isolation device, can enclose the electrolytic cell 11 in an isolation space when replacing the residual electrode. In this way, after the gas collection hood is opened, the harmful hot flue gas released by the electrolytic cell 11 can be collected by the isolation space and will not be randomly discharged into the outside atmosphere. This solves the problem of the unorganized emission of harmful hot flue gas into the outside world, which harms human health and the environment.

[0026] To ensure timely treatment of harmful hot flue gas, a purification device 2 is installed on the main frame 3. The purification device 2 is connected to the top isolation cover 10, meaning that the top isolation cover 10 has a connection port for communicating with the purification device 2. Specifically, the purification device 2 can be a negative pressure dust collection device based on dry purification, consistent with the invention patent application with publication number CN110453249A. Its structure will not be described in detail here.

[0027] During the pole-changing operation, the harmful hot flue gas inside the isolation space can be collected and treated in a timely manner by the purification device 2.

[0028] In a preferred embodiment, the movable isolation cover includes four roller blind mechanisms 7, each comprising a roller and a curtain. Rotating the roller causes the curtain to retract or extend. The four roller blind mechanisms 7 are respectively connected to the four sides of the top isolation cover 10, and curtain connecting structures are provided at both ends of the curtain in the horizontal direction. These connecting structures allow the curtains of the four roller blind mechanisms 7 to be connected to the curtains of adjacent roller blind mechanisms 7 at both ends, thereby forming a closed enclosure structure.

[0029] It should be noted that a clearance groove is provided on the curtain fabric away from the aluminum outlet end of the electrolytic cell 11 to avoid the electrolytic cell exhaust pipe 1101. To prevent the space below the electrolytic cell exhaust pipe 1101 where the clearance groove is located from becoming a hot flue gas leakage channel, a baffle can be connected to the lower side of the exhaust pipe 1101 at the production site to block the space at the clearance groove and ensure the isolation effect.

[0030] Compared with using folding flip-up fabric or lifting isolation cylinder, using a roller shutter mechanism 7 as a movable isolation cover can more easily retract the curtain and reduce the space occupied by the pole switching system.

[0031] In some embodiments, the curtain connection structure can be a magnetic structure, with permanent magnets that can be attracted to each other on the sides of two adjacent curtains, or one curtain has a permanent magnet and the other has a ferromagnetic material. After the curtains are unfolded, the magnetic structures can attract each other.

[0032] In some embodiments, the curtain connection structure can be a zipper structure, with interlocking teeth on the sides of adjacent curtains, and the pull head located at a suitable position on the outer shell of the roller blind mechanism 7. The teeth on both sides of the curtain interlock with each other through the Y-shaped groove inside the pull head.

[0033] Of course, in other implementations, structures such as mushroom-shaped hook and loop fasteners can also be used as curtain connection structures.

[0034] In some preferred embodiments, a counterweight rod is provided at the lower end of the curtain. After the curtain is lowered, the counterweight rod can straighten the curtain, which can improve the stability of the curtain and facilitate the connection between adjacent curtains.

[0035] In some preferred embodiments, a drive motor can be configured for the roller of the roller blind mechanism 7, in which case the roller blind mechanism is essentially an electric roller blind. Compared with the manually operated roller blind mechanism 7, the electric method can greatly reduce the labor intensity of personnel.

[0036] In some preferred embodiments, the curtain fabric can be made of high-temperature resistant fireproof fabric, such as Wiki composite fabric or polyester fiber fireproof fabric, to ensure on-site operation safety.

[0037] In addition, the electrode switching system is also equipped with a pallet lifting mechanism 6 on the main frame 3. The pallet lifting mechanism 6 can be raised and lowered to lift the pallet 8 of the pallet placement position 9 located on the aluminum outlet side of the electrolytic cell 11 in the workshop 1. Furthermore, the pallet lifting mechanism 6 is located in an isolated space.

[0038] During pole changing, the new pole to be replaced can be placed on the tray 8 in advance. The tray lifting mechanism 6 can lift the tray 8 containing the new pole, specifically through the lifting parts 801 connected to the four corners of the tray 8. After removing the residual pole, the pole changing device can place the residual pole on the tray 8 and remove the new pole from the tray 8 to complete the replacement. In other words, the travel distance of the pole changing device is sufficient to place the residual pole on the tray 8 and remove the new pole from the tray 8 for replacement.

[0039] The electrode switching device can be equipped with separate electrode switching carts and trays 8 for removing residual electrodes and replacing new electrodes. For example... Figures 1-3 As shown, the pole-changing device includes a residual pole car beam 12 and a new pole car beam 15. The residual pole car beam 12 and the new pole car beam 15 are parallel to the longitudinal beam 302, and both ends of the two beams are supported by a cross beam 301 and can be translated along the cross beam 301. Specifically, a traveling wheel 13 and a guide wheel 14 are also arranged at both ends of the residual pole car beam 12 and the new pole car beam 15. The traveling wheel 13 can travel and move along the upper surface of the cross beam 301, and the guide wheel 14 at both ends can be internally supported on the opposite side surface of the two cross beams 301. Naturally, a traveling drive mechanism is also provided for the traveling wheel 13.

[0040] The residual electrode carriage 4, which can move along the main beam 12, is used to remove the residual electrode. Correspondingly, rollers and drive mechanisms are also provided between the residual electrode carriage 4 and the new electrode carriage main beam 15.

[0041] The new pole car beam 15 is equipped with a new pole car 5 that can move along it, which is a pole changing car for loading new poles. Correspondingly, rollers and drive mechanisms are also provided between the new pole car 5 and the new pole car beam 15.

[0042] In this preferred embodiment, by controlling the movement of the residual electrode carriage beam 12 and the new electrode carriage beam 15 along the crossbeam 301, the corresponding residual electrode carriage 4 or new electrode carriage 5 can be moved along the length direction of the electrolytic cell 11. By controlling the movement of the residual electrode carriage 4 and the new electrode carriage 5 along the corresponding beam, the residual electrode carriage 4 or the new electrode carriage 5 can be moved along the arrangement direction of the electrolytic cell 11.

[0043] Correspondingly, two sets of pallet lifting mechanisms 6 are installed on the main frame 3. Correspondingly, the two sets of pallet lifting mechanisms 6 are used to lift different pallets 8. One pallet 8 is used to place the residual electrode, which can be defined as the residual electrode pallet 8, and the other pallet 8 is used to place the new electrode, which can be defined as the new electrode pallet 8. The new electrode pallet 8 and the residual electrode pallet 8 can be arranged in the pallet placement position 9 according to the arrangement direction of the electrolytic cell 11. When performing electrode replacement operation, the two pallets 8 are lifted by the corresponding pallet lifting mechanisms 6, and the residual electrode is placed on the residual electrode pallet 8 by adjusting the movement of the residual electrode carriage beam 12 and the residual electrode carriage 4, and the new electrode is removed from the pallet 8 by adjusting the movement of the new electrode carriage beam 15 and the new electrode carriage 5.

[0044] Finally, it should be noted that the above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An isolation device for electrode switching in an electrolytic cell, characterized in that, It includes a top isolation cover, and a retractable movable isolation cover at the lower end of the top isolation cover. The top isolation cover is used to be mounted on the pole changing crane and moves with the pole changing crane. After the movable isolation cover is lowered, it encloses an isolation space that can cover one or more electrolytic cells. A communication port is provided on the top isolation cover for communicating with a purification device so that the air inside the isolation space can be purified by the purification device during pole changing operation.

2. The isolation device for electrode switching in an electrolytic cell according to claim 1, characterized in that, The movable isolation cover includes four roller blind mechanisms connected to the four sides of the top isolation cover. Each roller blind mechanism includes a roller and a curtain, so that the curtain can be rolled up and down by rotating the roller. The curtain has curtain connecting structures at both ends in the horizontal direction, so that it can be connected to the curtains of the adjacent roller blind mechanisms at both ends.

3. The isolation device for electrode switching in an electrolytic cell according to claim 2, characterized in that, The curtain connection structure is a magnetic structure.

4. The isolation device for electrode switching in an electrolytic cell according to claim 2, characterized in that, The curtain connection structure is a zipper structure.

5. The isolation device for electrode switching in an electrolytic cell according to any one of claims 2-4, characterized in that, A counterweight rod is provided at the lower end of the curtain.

6. The isolation device for electrode switching in an electrolytic cell according to any one of claims 2-4, characterized in that, The curtain fabric is made of glass fiber composite fabric or polyester fireproof fabric.

7. The isolation device for electrode switching in an electrolytic cell according to any one of claims 2-4, characterized in that, The roller is equipped with a drive motor, and the roller shutter mechanism constitutes an electric roller shutter.

8. The isolation device for electrode switching in an electrolytic cell according to any one of claims 1-4, characterized in that, The movable isolation cover is configured in the direction of the electrolytic cells in the workshop to form an isolation space that can cover two or more electrolytic cells after being lowered.

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