Connection method for aluminum electrolysis series rectification station and main power house
By dividing the rectification into forward and reverse current unit groups, and setting multiple electrode points between the two factories in the electrolysis workshop to form opposite current directions, the high voltage problem caused by traditional rectification is solved and the insulation design is reduced Difficulty and risk improve the operational safety of the electrolysis workshop.
Patent Information
- Application Number
- CN202411457118.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-18
- Publication Date
- 2025-01-10
AI Technical Summary
The traditional rectifier structure leads to a high series voltage in the electrolytic workshop, which brings difficulties and risks to insulation design and maintenance, and lacks flexible connection methods.
The rectifier is divided into a forward current unit group and a reverse current unit group, and at least one positive electrode power supply point and one negative electrode power outlet point are set between the two factories in the electrolysis workshop to form two opposite current directions, thereby reducing the rectifier. total voltage.
It effectively reduces the series voltage of the electrolytic workshop, reduces the insulation design level, and improves operating safety and reliability.
Smart Images
Figure CN119287453A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a method for connecting an aluminum electrolysis series rectifier station and a main plant, belonging to the technical field of aluminum electrolysis. Background Art
[0002] The electrolytic cell is the main equipment of the aluminum plant. A traditional electrolytic series generally has more than 100-400 electrolytic cells connected in series. After the strong DC current (200-800kA) flows out from the positive electrode of the rectifier, it enters the column busbar, anode, electrolyte, aluminum liquid, cathode, cell busbar, etc. of each cell in turn, and finally returns to the negative electrode of the rectifier.
[0003] The traditional rectifier station has only one positive and negative pole structure, and the layout is relatively simple. The rectifier station includes multiple groups of DC power supplies. Each power supply group is composed of a voltage regulating rectifier transformer and a rectifier cabinet in series. The DC side positive output terminal of the rectifier cabinet is connected to the positive DC busbar through the positive branch busbar, and the DC side negative output terminal of the rectifier cabinet is connected to the negative DC busbar through the negative branch busbar.
[0004] The electrolysis workshop of the aluminum electrolysis series consists of two parallel electrolysis buildings, 1# and 2#. The positive pole of the rectifier is connected to the busbar at the head end of the 1# building through the positive DC busbar, and then the strong DC current (200-800kA) enters the column busbar, anode, electrolyte, aluminum liquid, cathode, busbar around the tank, etc. of each tank in the 1# building in turn, and then enters the tail end of the 2# building through the end busbar connecting the two buildings, and then enters the column busbar, anode, electrolyte, aluminum liquid, cathode, busbar around the tank, etc. of each tank in the 2# building in turn, and finally returns to the negative pole of the rectifier through the head end busbar and negative DC busbar of the 2# building.
[0005] The configuration structure of the rectifier and the electrolysis workshop is mature, stable and reliable, and has been used in the field of electrolytic aluminum for many years. However, there are still some shortcomings, such as: the rectifier is only equipped with one positive output terminal and one negative receiving terminal for the electrolysis workshop, so the DC current output by the rectifier has only one flow direction (forward or reverse) in the electrolysis workshop, resulting in a high operating voltage of the full electrolysis series. With the different number of electrolytic cells configured in the electrolysis workshop, the general series voltage is as high as 700-1400V, which brings certain difficulties and risks to the insulation design, insulation maintenance, production operation, etc. of the electrolysis series.
[0006] Therefore, in the field of aluminum electrolysis, if there can be a new connection method and structure between the rectifier and the electrolysis workshop, the series voltage value of the electrolysis workshop can be significantly reduced, and the level of insulation design can be reduced accordingly, thereby bringing greater convenience and safety to the insulation maintenance and production operation of the electrolysis series. Summary of the invention
[0007] The purpose of the present invention is to provide a method for connecting an aluminum electrolysis series rectifier station with a main plant. The method can achieve the purpose of reducing the series voltage of the electrolysis workshop, reducing the insulation design level, reducing the insulation inspection and maintenance of the electrolysis workshop, and improving the operation safety of the workshop.
[0008] The technical solution of the present invention is: a method for connecting an aluminum electrolysis series rectifier station with a main plant, comprising a rectifier station, an electrolysis plant A and an electrolysis plant B, wherein the rectifier station is composed of a forward current unit group and a reverse current unit group, the tail ends of the electrolysis plant A and the electrolysis plant B are connected together via a connecting bus A and a connecting bus B, the forward current unit group is connected to a DC bus A, the reverse current unit group is connected to a DC bus B, the DC bus A is connected to the electrolytic cells at the head end of the electrolysis plant A and the electrolysis plant B respectively through a forward positive electrode group and a forward negative electrode group, the DC bus B is connected to the electrolytic cells at the head end of the electrolysis plant A and the electrolysis plant B respectively through a reverse negative electrode group and a reverse positive electrode group, the forward current unit group is used to provide a forward current to the electrolytic cells in the electrolysis plant, and the reverse current unit group is used to provide a reverse current to the electrolytic cells in the electrolysis plant; The forward positive electrode group and the reverse positive electrode group are provided with at least one positive electrode power supply point, and the reverse negative electrode group and the forward negative electrode group are provided with at least one negative electrode power output point. The number of positive electrode power supply points and negative electrode power output points in the same current unit group can be equal or unequal.
[0009] In the aforementioned method of connecting an aluminum electrolysis series rectifier station with a main plant, a plurality of voltage-regulating rectifier transformers and rectifier cabinets are first connected in series to form a rectifier system inside the forward current unit group and the reverse current unit group, and then a plurality of rectifier systems are connected in parallel to form a current unit group.
[0010] In the aforementioned method for connecting an aluminum electrolysis series rectifier station to a main plant, the forward current unit group and the reverse current unit group are both arranged on the upper side or the lower side of the electrolysis plant.
[0011] Beneficial effects of the present invention: Compared with the prior art, the present invention divides the rectifier unit to which the rectifier belongs into two different independent control unit groups, namely, a forward current unit group and a reverse current unit group. At least one positive power supply point and one negative power output point are arranged between the two unit groups and each factory building of the electrolysis workshop, and two opposite current directions (forward and reverse) are formed inside the two factory buildings of the electrolysis workshop.
[0012] Taking a specific embodiment as an example, before and after the new connection mode and structure of the present invention are adopted, the total current intensity provided by the rectification and the total resistance in the two buildings of the electrolysis workshop do not change. Assuming that the number of positive power supply points and negative power output points in each building is equal, that is, the magnitude of the forward current and the reverse current are equal, according to U = I总 *R 总 , two currents with equal values in opposite directions are equivalent to dividing the total current in a single direction into 1 / 2, that is I 总 =I 顺总 +I 逆总 =0.5I 总 + 0.5I 总 , the voltage after connection can be expressed as U=U 顺总 =I 顺总 *R 总 =U 逆总 =I 逆总 *R 总 =0.5I 总 *R 总 , electrolysis series U It has been reduced to half of the original level, which has effectively reduced the series voltage (700-1400V) of the entire electrolysis workshop, greatly improving the operating safety and reliability of the electrolysis series.
[0013] If the number of positive power supply points and negative power output points in each factory building is not equal, the two opposite current directions will be redistributed unequally according to the proportion of the total current, which can also achieve the purpose of reducing the series voltage. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Picture 1 It is a structural schematic diagram of the present invention.
[0015] Figure markings: 1-rectifier, 2-forward current unit group, 3-reverse current unit group, 4-DC bus A, 5-DC bus B, 6-forward positive electrode group, 7-reverse negative electrode group, 8-forward negative electrode group, 9-reverse positive electrode group, 10-electrolysis plant A, 11-electrolysis plant B, 12-connecting bus A, 13-connecting bus B. DETAILED DESCRIPTION
[0016] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.
[0017] An embodiment of the present invention: A method for connecting an aluminum electrolysis series rectifier station with a main plant, comprising a rectifier station 1, an electrolysis plant A10 and an electrolysis plant B11, wherein the electrolysis plant A10 and the electrolysis plant B11 are two electrolysis plants parallel to each other, each electrolysis plant is provided with more than 100-400 electrolytic cells connected in series, the rectifier station 1 is composed of a forward current unit group 2 and a reverse current unit group 3, the tail ends of the electrolysis plant A10 and the electrolysis plant B11 are connected together via a connecting bus A12 and a connecting bus B13, the forward current unit group 2 and the reverse current unit group 3 are respectively connected to the electrolysis plant A10 and the electrolysis plant B11, the forward current unit group 2 is used to provide a forward current to the electrolytic cells in the electrolysis plant, and the reverse current unit group 3 is used to provide a reverse current to the electrolytic cells in the electrolysis plant.
[0018] The specific connection structure is: the forward current unit group 2 is connected to the DC busbar A4, the reverse current unit group 3 is connected to the DC busbar B5, the DC busbar A4 is connected to the head-end electrolytic cells of the electrolysis building A10 and the electrolysis building B11 through the forward positive electrode group 6 and the forward negative electrode group 8 respectively, and the DC busbar B4 is connected to the head-end electrolytic cells of the electrolysis building A10 and the electrolysis building B11 respectively through the reverse negative electrode group 7 and the reverse positive electrode group 9.
[0019] The forward positive electrode group 6 and the reverse positive electrode group 9 are provided with at least one positive electrode power supply point, and the reverse negative electrode group 7 and the forward negative electrode group 8 are provided with at least one negative electrode power output point. The number of positive electrode power supply points and negative electrode power output points of the same current unit group can be equal or unequal.
[0020] The forward current unit group 2 and the reverse current unit group 3 are both arranged on the upper side or the lower side of the electrolysis plant, which is convenient for management and convenient for wiring between the current unit group and the electrolytic cell, and the wires used are minimal.
[0021] The present invention discloses a novel connection method between a rectifier station and a main plant (electrolysis workshop) of an aluminum electrolytic plant, comprising a rectifier station 1 and electrolysis workshops (electrolysis workshop A10 and electrolysis workshop B11). The rectifier station 1 supplies power to the electrolytic cells of the electrolysis workshop A10 and the electrolysis workshop B11, and two DC power supply loops are formed in the two plants, and the current directions of the two DC power supply loops are opposite.
[0022] The rectifier station 1 is composed of a forward current unit group 2 and a reverse current unit group 3. The interiors of the forward current unit group 2 and the reverse current unit group 3 are composed of a plurality of voltage regulating rectifier transformers and rectifier cabinets which are first connected in series to form a rectifier system, and then the plurality of rectifier systems are connected in parallel to form a current unit group.
[0023] The forward current unit group 2 is connected to the DC busbar A4, and the reverse current unit group 3 is connected to the DC busbar B5.
[0024] In specific implementation, the DC positive output end of the rectifier cabinet to which the forward current unit group 2 belongs is first connected to the positive DC busbar (the positive electrode unit of the DC busbar A4) through the positive branch busbar, and then is divided into 1#, 2#...n# positive poles through the forward positive pole group 6 to supply power to the 1# electrolytic cell of the electrolysis plant A10. The DC side negative output end of the rectifier cabinet to which the forward current unit group 2 belongs is first connected to the negative DC busbar (the negative electrode unit of the DC busbar A4) through the negative branch busbar, and then is divided into 1#, 2#...n# negative poles through the forward negative pole group 8 to connect to the 1# electrolytic cell of the electrolysis plant B11.
[0025] The direction of the forward current in the electrolysis workshop is as follows: forward current unit group 2 → positive electrode unit of DC busbar A4 → forward positive electrode group 6 → 1# electrolytic cell of electrolysis plant A10 → each electrolytic cell in electrolysis plant A10 → connecting busbar A12 → the electrolytic cell at the end of electrolysis plant B11 → each electrolytic cell in electrolysis plant B11 → 1# electrolytic cell in electrolysis plant B11 → forward negative electrode group 8 → negative electrode unit of DC busbar A4 → forward current unit group 2.
[0026] Similarly, the DC positive output terminal of the rectifier cabinet to which the reverse current unit group 3 belongs is first connected to the positive DC busbar (the positive electrode unit of the DC busbar B5) through the positive branch busbar, and then is divided into 1#, 2#...n# positive poles through the reverse positive pole group 9 to supply power to the electrolytic cell in the electrolysis plant 11. The DC side negative output terminal of the rectifier cabinet to which the reverse current unit group 3 belongs is first connected to the negative DC busbar (the negative electrode unit of the DC busbar B5) through the negative branch busbar, and then is divided into 1#, 2#...n# negative poles through the reverse negative pole group 7 to connect to the 1# electrolytic cell in the electrolysis plant 10.
[0027] The direction of reverse current in the electrolysis workshop is as follows: reverse current unit group 3 → positive electrode unit of DC busbar B5 → reverse positive electrode group 9 → 1# electrolytic cell of electrolysis plant B11 → each electrolytic cell in electrolysis plant B11 → connecting busbar B13 → the electrolytic cell at the end of electrolysis plant A10 → each electrolytic cell in electrolysis plant A10 → 1# electrolytic cell in electrolysis plant A10 → reverse negative electrode group 7 → negative electrode unit of DC busbar B5 → reverse current unit group 3.
[0028] The invention design provides a new and flexible connection method between the rectifier station and the electrolysis workshop. The invention design focuses on dividing the rectifier unit belonging to the rectifier station into a forward current unit group 2 and a reverse current unit group 3. At least one positive power supply point and one negative power output point are arranged between the two unit groups and each factory building of the electrolysis workshop. Finally, two opposite current directions (forward and reverse) are formed inside the two factory buildings of the electrolysis workshop. Therefore, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A method for connecting a rectifier station and a main plant of an aluminum electrolysis series, comprising a rectifier station (1), an electrolysis plant A (10) and an electrolysis plant B (11), characterized in that: The rectifier station (1) is composed of a forward current unit group (2) and a reverse current unit group (3). The tail ends of the electrolysis plant A (10) and the electrolysis plant B (11) are connected together via a connecting bus A (12) and a connecting bus B (13). The forward current unit group (2) is connected to a DC bus A (4). The reverse current unit group (3) is connected to a DC bus B (5). The DC bus A (4) is connected to a forward positive electrode group (6) and a forward negative electrode group. (8) are respectively connected to the electrolytic cells at the head end of the electrolytic plant A (10) and the electrolytic plant B (11); the DC busbar B (4) is respectively connected to the electrolytic cells at the head end of the electrolytic plant A (10) and the electrolytic plant B (11) through the reverse negative electrode group (7) and the reverse positive electrode group (9); a forward current is provided to the electrolytic cells in the electrolytic plant through the forward current unit group (2); and a reverse current is provided to the electrolytic cells in the electrolytic plant through the reverse current unit group (3); The forward positive electrode group (6) and the reverse positive electrode group (9) are provided with at least one positive electrode power supply point, and the reverse negative electrode group (7) and the forward negative electrode group (8) are provided with at least one negative electrode power output point. The number of positive electrode power supply points and negative electrode power output points in the same current unit group may be equal or unequal.
2. The method for connecting an aluminum electrolysis series rectifier station to a main plant according to claim 1, characterized in that: The forward current unit group (2) and the reverse current unit group (3) are both composed of a plurality of voltage regulating rectifier transformers and rectifier cabinets which are first connected in series to form a rectifier system, and then a plurality of rectifier systems are connected in parallel to form a current unit group.
3. The method for connecting an aluminum electrolysis series rectifier station with a main plant according to claim 1, characterized in that: The forward current unit group (2) and the reverse current unit group (3) are both arranged on the upper side or the lower side of the electrolysis plant.