Online shunting and demagnetizing device for 200kA aluminum electrolysis cell

Abstract

The utility model discloses an on-line shunting degaussing device for a 200kA aluminum electrolysis cell, which comprises a first clamping assembly, a second clamping assembly and a switching assembly, the first clamping assembly is in contact with and fixedly connected with a cell stopping upright post bus, and the second clamping assembly is in contact with and fixedly connected with a downstream upright post bus adjacent to the cell stopping upright post bus; the switching assembly is arranged between the first clamping assembly and the second clamping assembly, the two ends of the switching assembly are provided with the flexible connecting assemblies and are connected with the first clamping assembly and the second clamping assembly through the flexible connecting assemblies respectively, and therefore current on the groove stopping stand column bus is transmitted to a downstream stand column bus through the switching assembly. According to the utility model, the magnetic field of the electrolytic bath is uniformly distributed, the condition of repair welding operation under the electrolytic series production condition is met, and the production and operation safety of the electrolytic series are ensured not to be influenced.

Description

Technical Field

[0001] The utility model relates to the field of electrolytic aluminum, in particular to an online shunting and demagnetizing device for a 200kA aluminum electrolytic cell. Background Art

[0002] The power supply mode of the aluminum electrolysis series is a power supply circuit formed by connecting multiple adjacent electrolytic cells in series. During normal production of the electrolysis series, direct current enters the anode of the cell through the first electrolytic cell column busbar, the slot busbar, and the anode busbar, and after passing through the electrolyte and aluminum liquid, enters the downstream electrolytic cell column busbar through the cathode busbar. Taking 200kA aluminum electrolysis as an example, the series current intensity is 200kA and the series voltage is 1115V under normal production conditions. The average voltage of a single electrolytic cell in production is 3.950V, and the average empty loss voltage is 350mV when the cell is stopped for overhaul; at the same time, in the production mode of a single stop cell, due to the large port current and strong magnetic field of the stop cell column busbar, the production process is accompanied by a strong magnetic field operating environment. Taking a single cell as an example, the 200kA electrolytic aluminum series has the strongest magnetic field at both ends of the electrolytic cell, about 200Gs, and the middle part of the electrolytic cell is about 50Gs.

[0003] At present, the aluminum electrolysis industry is facing the above problems, resulting in the following technical bottlenecks: First, the cathode circuit busbar live idle consumption is relatively high during the shutdown of the aluminum electrolysis series for overhaul. Although the industry has relevant consumption reduction methods, such as a parallel busbar shunt device for aluminum electrolysis cells disclosed in patent number ZL200820078054.X, the shunt device can reduce 10-30mV for a single cell, and the consumption reduction effect is not obvious; second, under the influence of a strong magnetic field environment, abnormal conditions in the electrolysis cell cannot be repaired and welded in time, seriously affecting the safe operation of the series. Summary of the invention

[0004] The utility model aims to solve the above problems and provide a 200kA aluminum electrolytic cell online shunting and demagnetizing device which has a simple structure and is easy to use.

[0005] In order to achieve the above purpose, the technical solution of the utility model is:

[0006] An online shunting and demagnetizing device for a 200kA aluminum electrolytic cell comprises a first clamping assembly, a second clamping assembly and a transfer assembly. The first clamping assembly contacts and is fixedly connected to a slot-stop column busbar, and the second clamping assembly contacts and is fixedly connected to a downstream column busbar adjacent to the slot-stop column busbar. The transfer assembly is arranged between the first clamping assembly and the second clamping assembly, and both ends of the transfer assembly are provided with flexible connection assemblies and are respectively connected to the first clamping assembly and the second clamping assembly through the flexible connection assemblies, so as to transfer the current on the slot-stop column busbar to the downstream column busbar via the transfer assembly.

[0007] Furthermore, the first clamping assembly and the second clamping assembly have the same structure. The first clamping assembly and the second clamping assembly each include two symmetrically arranged clamping plates, which are respectively arranged on both sides of the stop slot column busbar or the downstream column busbar. An adjusting bolt is arranged between the two clamping plates, and the two clamping plates are relatively close to each other by tightening the adjusting bolt so that the inner walls of the two clamping plates are abutted against the side walls of the stop slot column busbar or the downstream column busbar; the two clamping plates are both connected to one end of the flexible connection assembly.

[0008] Furthermore, the adapter assembly includes a lifting box, which is a structure with both ends open laterally. A conductive part is arranged in the lifting box, and both ends of the conductive part extend from the two open ends of the lifting box and are respectively connected to one end of two flexible connection components; insulating pads are arranged between the bottom end of the lifting box and the bottom end face of the conductive part, and between the top end of the lifting box and the top end face of the conductive part.

[0009] Furthermore, support columns are fixedly connected to both sides of the bottom end of the hoisting box, and insulating pads are also arranged between the top ends of the support columns and the bottom end surfaces of the conductive parts.

[0010] Furthermore, a lifting lug for lifting operations is fixedly connected to the top of the lifting box.

[0011] Furthermore, the flexible connection assembly includes two groups of symmetrically arranged metal soft belts, which are arranged corresponding to the two clamping plates, one end of each group of metal soft belts is respectively connected to one end of the corresponding clamping plate, and the other end of each group of metal soft belts is connected to the conductive member.

[0012] Furthermore, each group of metal flexible belts includes a plurality of metal flexible belts, which are arranged at equal intervals along the height direction of the clamping plate, one end of the plurality of metal flexible belts is connected to the clamping plate, and the other end of the plurality of metal flexible belts is connected to the conductive member.

[0013] Furthermore, the metal soft belt is an aluminum soft belt stacked in the thickness direction.

[0014] Furthermore, the online shunt demagnetization device also includes a power-off plate with an insulating effect. The power-off plate is clamped between the clamping plate and the stop slot column busbar or the downstream column busbar during the installation of the first clamping assembly and the second clamping assembly. The power-off plate is pulled out from between the clamping plate and the stop slot column busbar or the downstream column busbar when the installation of the first clamping assembly and the second clamping assembly is completed.

[0015] Compared with the prior art, the utility model has the following advantages and positive effects:

[0016] 1. The on-line shunt degaussing device in the present utility model can realize the connection and shunt operation between the stopped cell column busbar and the downstream column busbar, effectively reducing the voltage loss during the major overhaul of the electrolytic cell when it is stopped. Verified by on-site use, the on-line shunt degaussing device can reduce the voltage loss by 60 - 80 mV, and its power consumption reduction effect is more obvious.

[0017] 2. The on-line shunt degaussing device in the present utility model realizes the shunt effect of the stopped cell column busbar, effectively improving the magnetic field distribution intensity around the electrolytic cell during normal production; after the device is installed and used, the magnetic field distribution of the electrolytic cell is uniform, meeting the conditions for repair welding operations under the production conditions of the electrolytic series, and ensuring the safe operation of the electrolytic series production is not affected.

[0018] 3. The on-line shunt degaussing device in the present utility model has a simple structure, is convenient for installation and disassembly, can greatly reduce the installation labor intensity, and can improve the operation safety at the same time; moreover, the on-line shunt degaussing device has high versatility and can be applied to all electrolytic cells in this series, bringing convenience to the production operation of electrolytic aluminum. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 is the installation effect diagram of the present utility model;

[0021] Figure 2 is the top view structure diagram of the present utility model;

[0022] Figure 3 is the shunt effect diagram of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some of the embodiments of the present utility model, rather than all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts, any modifications, equivalent replacements, improvements, etc., shall be included in the protection scope of the present utility model.

[0024] Such as Figure 1 、 Figure 2 and Figure 3As shown, in order to effectively eliminate the problem of high idle power consumption and large on-site magnetic field during the overhaul shutdown period, this embodiment designs a set of online shunt demagnetization devices, the purpose of which is to form the shortest bypass loop, reduce the power loss during the shutdown period of the electrolytic cell, and weaken the on-site magnetic field;

[0025] The online current shunting and demagnetizing device comprises a first clamping assembly, a second clamping assembly and a transfer assembly. The first clamping assembly contacts and is fixedly connected to a slot-stop column busbar 1, and the second clamping assembly contacts and is fixedly connected to a downstream column busbar 2 adjacent to the slot-stop column busbar 1. The transfer assembly is arranged between the first clamping assembly and the second clamping assembly. Both ends of the transfer assembly are provided with flexible connection assemblies and are respectively connected to the first clamping assembly and the second clamping assembly through the flexible connection assemblies, so as to transfer the current on the slot-stop column busbar 1 to the downstream column busbar 2 through the transfer assembly.

[0026] The first clamping assembly and the second clamping assembly have the same structure. Both the first clamping assembly and the second clamping assembly include two symmetrically arranged clamping plates 3, which are respectively arranged on both sides of the stop slot column busbar 1 or the downstream column busbar 2. An adjusting bolt 4 is arranged between the two clamping plates 3, and the two clamping plates 3 are relatively close to each other by tightening the adjusting bolt 4, so that the inner walls of the two clamping plates 3 are abutted against the side walls of the stop slot column busbar 1 or the downstream column busbar 2; the two clamping plates 3 are connected to one end of the flexible connection assembly.

[0027] Since the short-circuit current of the electrolytic cell is large and the magnetic field is strong after the cell is stopped, the designed clamping plate is formed in one piece through CNC cutting. The material uses pure aluminum with a small amount of boron added. It has good conductivity, light weight and is easy to install. A safe current density is selected, the cross-sectional size of the clamping plate is designed, and bolts are used to achieve safe diversion.

[0028] The adapter assembly includes a lifting box 7, which is a structure with both ends open laterally. A conductive member 8 is arranged inside the lifting box 7, and both ends of the conductive member 8 extend from the two open ends of the lifting box 7 and are respectively connected to one end of two flexible connection components; insulating pads 9 are arranged between the bottom end of the lifting box 7 and the bottom end face of the conductive member 8, and between the top end of the lifting box 7 and the top end face of the conductive member 8.

[0029] Support columns 10 are fixedly connected to both sides of the bottom of the hoisting box 7, and an insulating pad is also arranged between the top of the support column 10 and the bottom end surface of the conductive member 8. A lifting lug for hoisting operation is fixedly connected to the top of the hoisting box 7.

[0030] The transfer component is designed in the way of a double-ear sling, which can hoist and install the entire on-line shunt degaussing device more balanced and stable during the hoisting process; and by installing an insulating pad on the inner lining of the hoisting box, its good insulation performance is ensured.

[0031] The transfer component is mainly used for the hoisting work of the overall conductive part; using a rigid conductive part, on the one hand, it is convenient for the standardized processing and production of the conductive part while ensuring the same current-carrying area, on the other hand, it can ensure the stable and reliable insulation between the hoisting box and the conductive part, and thirdly, it reduces the unstable factors existing during the hoisting of the flexible conductive part, reducing the operation difficulty and operation risk.

[0032] The flexible connection component includes two groups of symmetrically arranged metal flexible belts 6. The two groups of metal flexible belts 6 located between the first clamping component and the transfer component are arranged corresponding to the two clamping plates 3 in the first clamping component, and the two groups of metal flexible belts 6 located between the second clamping component and the transfer component are arranged corresponding to the two clamping plates 3 in the second clamping component; one end of each group of metal flexible belts 6 is respectively connected to one end of the corresponding clamping plate 3, and the other end of each group of metal flexible belts 6 is connected to the conductive part 8.

[0033] Each group of metal flexible belts 6 includes a plurality of metal flexible belts. The plurality of metal flexible belts are arranged at equal intervals along the height direction of the clamping plate 3. One end of the plurality of metal flexible belts is connected to the clamping plate 3, and the other end of the plurality of metal flexible belts is connected to the conductive part 8.

[0034] The metal flexible belt 6 is an aluminum skin flexible belt laminated in the thickness direction.

[0035] Each group of metal flexible belts is made of 15 bundles (10 pieces in each bundle) of aluminum skin. After annealing treatment, it has low strength and strong flexibility, can be bent and adjusted according to the actual size on site, and is convenient for accurate alignment and installation.

[0036] In the structure of the electrolytic cell, the stopped cell column busbar usually has four ports. The on-line shunt degaussing device of the present invention is respectively arranged at the four ports and is connected to the ports of the downstream column busbar through this device. Through four standard groups of conductive parts, effective average shunting can be achieved, thereby improving the uniformity of the environmental magnetic field distribution. (In the existing structure, the four short-circuit busbars of the stopped cell can be safely shunted under normal circumstances, but due to their completely different design structures and sizes, there is a situation of uneven shunting, resulting in a chaotic magnetic field distribution and affecting the safety of production operation).

[0037] The online shunt degaussing device further includes a power-off plate 5 with insulation effect. During the installation of the first clamping assembly and the second clamping assembly, the power-off plate 5 is clamped between the clamping plate 3 and the stopped cell column busbar 1 or the downstream column busbar 2, and is withdrawn from between the clamping plate 3 and the stopped cell column busbar 1 or the downstream column busbar 2 when the installation of the first clamping assembly and the second clamping assembly is completed.

[0038] Taking the installation and application of a group of column busbars of 200 kA as an example, this embodiment details the process of safety operation specifications.

[0039] 1. Grind the four contact surfaces of the stopped cell column busbar and the downstream cell column busbar to remove the oxide layer.

[0040] 2. Install power-off plates at the grinding positions on both sides of the two groups of column busbars.

[0041] 3. Command the overhead crane to use the lifting tool to smoothly lift the entire online shunt degaussing device between the two column busbars through the lifting container, and use the support column for safety support.

[0042] 4. Set the two clamping plates in the first clamping assembly on both sides of the stopped cell column busbar, adjust the relative positions of the bolt holes between the two clamping plates, and connect the two clamping plates through bolts to achieve pre-tightening between the clamping plate and the stopped cell column busbar.

[0043] 5. Take out the power-off plates on both sides of the stopped cell column busbar, continue to tighten the bolts, and make the clamping plate completely locked and pressed on the side wall of the stopped cell column busbar.

[0044] 6. Check the contact situation of the pressing surface between the clamping plate and the stopped cell column busbar. If problems such as gaps and bias voltage occur, they must be dealt with immediately.

[0045] 7. Start the pressing work of the second clamping assembly and the downstream cell column busbar. The process is the same as steps 3-6, but the pressing speed is required to be faster to avoid too long spark time.

[0046] 8. Check the voltage drop and temperature of the two groups of column busbars and the online shunt degaussing device.

[0047] 9. Carry out the installation operation of the next group of online shunt degaussing devices.

[0048] The utility model has the following beneficial effects:

[0049] 1. The online shunt degaussing device in the utility model can realize the connection and shunt operation between the stopped cell column busbar and the downstream column busbar, and can effectively reduce the voltage idle loss during the major overhaul of the electrolytic cell when it is stopped. Through on-site use verification, the online shunt degaussing device can reduce the voltage idle loss by 60-80 mV, and its power consumption reduction effect is more obvious.

[0050] 2. The on-line shunt degaussing device in the utility model realizes the shunt effect of the stopped cell column busbar, effectively improving the magnetic field distribution intensity around the electrolytic cell during normal production; after the device is installed and used, the magnetic field distribution of the electrolytic cell is uniform, meeting the conditions for repair welding operations under the production conditions of the electrolytic series, and ensuring that the production operation safety of the electrolytic series is not affected.

[0051] 3. The on-line shunt degaussing device in the utility model has a simple structure, is convenient for installation and disassembly, can greatly reduce the installation labor intensity, and at the same time can improve the operation safety; moreover, the on-line shunt degaussing device has high versatility and can be applied to all electrolytic cells in this series, bringing convenience to the production operation of electrolytic aluminum.

Claims

1. A 200kA aluminum electrolytic cell online shunt demagnetization device, characterized in that: The online current shunting and demagnetizing device includes a first clamping component, a second clamping component, and a transfer component. The first clamping component contacts and is fixedly connected to the stop slot column busbar, and the second clamping component contacts and is fixedly connected to the downstream column busbar adjacent to the stop slot column busbar. The transfer component is arranged between the first clamping component and the second clamping component. Flexible connection components are arranged at both ends of the transfer component and are respectively connected to the first clamping component and the second clamping component through the flexible connection components, so as to transfer the current on the stop slot column busbar to the downstream column busbar through the transfer component.

2. The 200kA aluminum electrolytic cell online shunting and demagnetization device according to claim 1, characterized in that: The first clamping assembly and the second clamping assembly have the same structure. Both the first clamping assembly and the second clamping assembly include two symmetrically arranged clamping plates, which are respectively arranged on both sides of the stop slot column busbar or the downstream column busbar. An adjusting bolt is arranged between the two clamping plates, and the two clamping plates are relatively close to each other by tightening the adjusting bolt so that the inner walls of the two clamping plates are abutted against the side walls of the stop slot column busbar or the downstream column busbar. Both the two clamping plates are connected to one end of the flexible connection assembly.

3. The 200kA aluminum electrolytic cell online shunting and demagnetization device according to claim 1, characterized in that: The adapter assembly includes a lifting box, which is a structure with two horizontal openings at both ends. A conductive part is arranged inside the lifting box, and the two ends of the conductive part extend out from the two open ends of the lifting box and are respectively connected to one end of two flexible connection components; insulating pads are arranged between the bottom end of the lifting box and the bottom end face of the conductive part, and between the top end of the lifting box and the top end face of the conductive part.

4. The 200kA aluminum electrolytic cell online shunting and demagnetization device as claimed in claim 3, characterized in that: Support columns are fixedly connected to both sides of the bottom end of the hoisting box, and insulating pads are also arranged between the top ends of the support columns and the end faces of the bottom ends of the conductive parts.

5. The 200kA aluminum electrolytic cell online shunting and demagnetization device as claimed in claim 4, characterized in that: A lifting lug for lifting operation is fixedly connected to the top of the lifting box.

6. The 200kA aluminum electrolytic cell online shunting and demagnetization device according to claim 2, characterized in that: The flexible connection assembly includes two groups of symmetrically arranged metal soft belts, which are arranged corresponding to two clamping plates, one end of each group of metal soft belts is connected to one end of the corresponding clamping plate, and the other end of each group of metal soft belts is connected to the conductive member.

7. The 200kA aluminum electrolytic cell online shunting and demagnetization device according to claim 6, characterized in that: Each group of metal flexible belts includes several metal flexible belts, which are arranged at equal intervals along the height direction of the clamping plate, one end of the several metal flexible belts is connected to the clamping plate, and the other end of the several metal flexible belts is connected to the conductive member.

8. The 200kA aluminum electrolytic cell online shunting and demagnetization device according to claim 7, characterized in that: The metal soft belt is an aluminum soft belt stacked in the thickness direction.

9. The 200kA aluminum electrolytic cell online shunting and demagnetization device according to claim 2, characterized in that: The online shunt demagnetization device also includes a power-off plate with an insulating effect. The power-off plate is clamped between the clamping plate and the stop slot column busbar or the downstream column busbar during the installation of the first clamping assembly and the second clamping assembly. The power-off plate is pulled out from between the clamping plate and the stop slot column busbar or the downstream column busbar when the installation of the first clamping assembly and the second clamping assembly is completed.

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