Modularized electrolytic tank for electrolytic manganese and integrated system of modularized electrolytic tank

Abstract

The invention relates to a modularized electrolytic cell for electrolytic manganese, a whole production line is divided into a plurality of electrically independent electrolytic cell units, a special low-voltage rectification power supply and an electrolyte circulating system are configured for each unit, and each unit can be independently started, stopped and overhauled. The method has the beneficial effects that parameters can be accurately adjusted, the influence of current fluctuation during integral series connection is reduced, the voltage of a single electrolytic cell unit can be more directly and accurately monitored, and the stable quality of produced electrolytic manganese is ensured; the total resistance of all the electrolytic cells is greatly reduced, and the line loss of electric energy is greatly reduced; the operating voltage is fundamentally reduced from the traditional hundreds of kilovolts to safer 100V and below 100V, so that the risk of high-voltage electric shock is greatly eliminated; production is not stopped when faults occur, and production is not reduced during maintenance, and production flexibility and reliability are achieved; the current loss can be obviously reduced, so that the total energy consumption of the system is greatly reduced; and meanwhile, the capacity expansion becomes simple and economical due to the modularized framework.

Description

Technical Field

[0001] This invention belongs to the field of electrolytic manganese technology, and particularly relates to a highly efficient and energy-saving modular electrolytic cell, power supply and electrolyte circulation system for electrolytic manganese. Background Technology

[0002] Electrolytic manganese, as an important basic industrial raw material, is typically produced using diaphragm electrolytic cells. Currently, the industry standard practice is to connect dozens to hundreds of electrolytic cells in series to form a complete electrolytic series, arranged horizontally or vertically within the workshop. The direct current required for the electrolysis process is supplied by a centralized rectifier station, whose output DC voltage must match the total voltage drop of the entire electrolytic series, i.e., equal to the product of the operating voltage of a single electrolytic cell (approximately 4.5V) and the number of cells in series. Correspondingly, the output current must meet the current density requirements set by the electrolysis process.

[0003] Under this traditional architecture, an electrolytic manganese plant with an annual output of 10,000 to 15,000 tons typically has a rectifier power supply capacity designed in the range of 5,000 to 9,000 kVA, and the output voltage can be adjusted between 0 and 1,000 V to meet different needs in the production process.

[0004] However, this "high-voltage series" mode, which has been used for many years, has many drawbacks in its application:

[0005] (1) Safety hazards exist: The entire set of equipment needs to operate at high voltage of hundreds to thousands of volts, and the operators are at extremely high risk of electric shock. At the same time, the insulation performance of the equipment is required to be extremely high, making safety management difficult and costly.

[0006] (2) Huge power loss: Due to the extremely high voltage during operation, the power loss on the DC power supply line is huge; in addition, in the operation links such as unloading and cleaning the tank, the working voltage of the entire series needs to be reduced in order to ensure safety. This not only interrupts production, but also causes huge energy waste.

[0007] (3) Difficult to produce flexibly: When any electrolytic cell malfunctions (such as a short circuit), or when necessary cell loading, unloading, cleaning and maintenance are required, the entire production line must be shut down, resulting in low equipment utilization and extremely small production capacity.

[0008] (4) High operation and maintenance costs and difficulty in expanding production: It is difficult to troubleshoot system faults and the maintenance cycle is long; if production capacity is to be expanded, it is usually necessary to carry out costly expansion and renovation of the entire power supply system (rectifier, transformer, etc.), which lacks flexibility and economy.

[0009] Therefore, there is an urgent need for an electrolytic cell layout scheme that can fundamentally solve systemic problems such as high voltage hazards, high energy consumption, rigid production processes, and inconvenient operation and maintenance. Summary of the Invention

[0010] The purpose of this invention is to overcome the shortcomings of the prior art and provide a highly efficient and energy-saving modular electrolytic cell, power supply and electrolyte circulation system for electrolytic manganese.

[0011] A modular electrolytic cell for electrolytic manganese includes at least one electrolytic cell unit, each with independent power supply, controllable current distribution, and precise parameter adjustment. This reduces the impact of current fluctuations when the entire cell is connected in series, allowing for more direct and accurate monitoring of the voltage of individual electrolytic cell units, ensuring stable quality of the produced electrolytic manganese. The electrolytic cell unit comprises multiple parallel-connected cell groups, each consisting of multiple cells connected in series. This arrangement significantly reduces the total resistance of all electrolytic cells (far less than the total resistance of connecting all cells in series), greatly reducing line losses. Each electrolytic cell unit operates at very low voltages (100V and below). This electrolytic cell unit can operate under the following voltage (not specified in the original text), which is significantly safer than traditional electrolytic cell arrangements that require high voltage (480-750V). During cell unloading, loading, and cleaning, each electrolytic cell unit operates independently without needing to reduce the voltage of other units, allowing them to continue electrolytically producing manganese normally, thus improving operational flexibility. Each electrolytic cell unit can be inspected, started, and stopped in stages. Modular design of multiple electrolytic cells allows for adjustments to the scale by adding or removing modules, enabling flexible capacity adjustments and easy expansion; expansion only requires increasing the number of electrolytic cell units.

[0012] As a preferred option, the number of electrolytic cell units can be adjusted according to the electrolytic discharge time cycle of the factory's electrolytic manganese production. The longer the electrolytic discharge time cycle, the more electrolytic cell units should be arranged.

[0013] As a preferred option:

[0014] The anode of the first electrolytic cell in the electrolytic cell group is electrically connected to the positive busbar, and the cathode of the last electrolytic cell in the electrolytic cell group is electrically connected to the negative busbar; the positive busbar and the negative busbar are used to supply power to multiple electrolytic cell groups connected in parallel; multiple electrolytic cells in the electrolytic cell group are connected in series through conductive copper busbars.

[0015] An insulating layer is installed between each electrolytic cell and the ground, and an insulating layer is also installed between adjacent electrolytic cells within the same electrolytic cell group to prevent leakage.

[0016] As a preferred option, the wiring paths of the positive and negative busbars are symmetrical to ensure that the line impedances are basically consistent and that the current distributed to each electrolytic cell group is uniform.

[0017] A power supply system for modular electrolytic cells is disclosed, comprising a transformer and multiple rectifiers. Each electrolytic cell unit is equipped with a corresponding rectifier (to improve rectification efficiency; a failure of a single rectifier does not affect the production of other electrolytic cell units, as the failure is isolated, requiring only the shutdown of the corresponding electrolytic cell unit; whereas in the original series-connected mode, a failure at any point would cause the entire production line to shut down). The electrolytic cell units are electrically connected to the rectifiers to ensure shorter DC power supply lines (DC power is required when producing electrolytic manganese, and shorter power supply lines result in less DC transmission loss). The rectifiers are electrically connected to the transformer. The transformer steps down the AC power supplied by the grid, and the rectifiers output the stepped-down AC power as even lower-voltage DC power to supply the electrolytic cell units, replacing the traditional inefficient mode of connecting a single rectifier in series with the entire production line.

[0018] As a preferred option:

[0019] The transformer includes a main transformer and multiple secondary transformers. The input side of each secondary transformer is electrically connected to the main transformer, and the output side of each secondary transformer is electrically connected to the corresponding rectifier. The main transformer is used to step down the AC power supplied by the grid to a first AC voltage value. The secondary transformers are used to step down the AC power from the first AC voltage value to a second AC voltage value, and output the second AC voltage value to the rectifier connected to it. The rectifiers and secondary transformers are arranged close to the corresponding electrolytic cell units.

[0020] The rectifier is also electrically connected to a current stabilizing circuit, a voltage stabilizing circuit, a soft-start circuit, and a fault protection circuit to prevent abnormalities such as overcurrent, overvoltage, and temperature exceeding the set value.

[0021] As a preferred embodiment, the voltage supplied by the power grid is AC 220KV, the first AC voltage value is AC 10KV, the second AC voltage value is AC 400V, and the output voltage of the rectifier is DC 40~100V.

[0022] An electrolyte circulation system for cooling and circulating electrolyte in a modular electrolyzer, wherein each electrolyzer unit is equipped with an electrolyte circulation system (group control of electrolyte temperature and concentration, which can improve the overall electrolyte temperature uniformity, reduce concentration differences, and reduce current efficiency unevenness caused by electrolyte temperature and concentration differences). The electrolyte circulation system includes: an electrolyte circulation device, a cooler, an electrolyte distribution device, a solution delivery pipe, and a solution delivery pump; the cathode chamber of the electrolyzer is connected to the inlet of the electrolyte circulation device through the solution delivery pipe, and the outlet of the electrolyte circulation device is connected to the solution delivery pump. The delivery pipe connects to the inlet of the electrolyte distribution device. The outlet of the electrolyte distribution device is divided into multiple paths and connected to the anode chamber of the electrolytic cell through the solution delivery pipe, realizing the circulation of the electrolyte outside the electrolytic cell and reducing the consumption of new electrolyte. The electrolyte circulation device is equipped with a cooler to cool the electrolyte in the electrolyte circulation device (centralized cooling) so that the electrolyte in the electrolytic cell is always kept at 38-42°C, avoiding the decrease in current efficiency due to Joule heating (electrolysis efficiency will drop sharply when the electrolyte temperature is >45°C). The solution delivery pipe is equipped with a solution delivery pump.

[0023] Preferably, both the electrolytic cell and the electrolyte circulation device are equipped with a temperature testing device, which is used to test the electrolyte temperature in the electrolytic cell and the electrolyte circulation device.

[0024] As a preferred option:

[0025] The electrolyte circulation device is also equipped with a qualified electrolyte inlet and an ammonia inlet;

[0026] The electrolyte circulation device is also equipped with an overflow port, which is connected to the anode chamber of the electrolytic cell. It is used to overflow the electrolyte into the anode chamber of the electrolytic cell when the electrolyte circulation device is full, so as to prevent the electrolyte from overflowing from the electrolyte circulation device.

[0027] Branch pipes have also been added to the solution delivery pipes used to connect the electrolyte circulation device and the electrolyte distribution device. The branch pipes are connected to the anode chamber of the electrolytic cell. The branch pipes are used to quickly replenish the anode chamber of the electrolytic cell with electrolyte of the appropriate temperature without going through the electrolyte distribution device, in order to cope with production scenarios where electrolyte needs to be introduced urgently.

[0028] The cooler is connected to the cooling circulating water inlet via the inlet pipe and to the cooling circulating water return via the outlet pipe.

[0029] Preferably, the rectifier and the secondary transformer are arranged in the same rectifier cabinet, and the rectifier in the same rectifier cabinet is electrically connected to the secondary transformer. The rectifier is also electrically connected to at least one electrolytic cell unit nearby.

[0030] The beneficial effects of this invention are:

[0031] This invention designs a modular electrolytic cell for producing electrolytic manganese. The entire production line is divided into multiple electrically independent electrolytic cell units, allowing for controllable current distribution and precise parameter adjustment. This reduces the impact of current fluctuations when the entire system is connected in series, enabling more direct and accurate monitoring of the voltage of individual electrolytic cell units, ensuring stable quality of the produced electrolytic manganese. The modular arrangement of the electrolytic cells significantly reduces the total resistance of all cells, greatly minimizing line losses. Each unit is equipped with a dedicated low-voltage rectifier power supply and electrolyte circulation system, fundamentally reducing the operating voltage from the traditional hundreds or thousands of volts to a safer 100V or below, with 60V or below being optimal, greatly eliminating the risk of high-voltage electric shock. Each unit can be started, stopped, and maintained independently, achieving "uninterrupted production during faults and no production reduction during maintenance," providing production flexibility and reliability. The use of a shorter DC power supply path significantly reduces current loss, resulting in a substantial decrease in total system energy consumption. Simultaneously, the modular architecture simplifies and economically expands production capacity.

[0032] The modular electrolytic cell, its power supply system, and its electrolyte circulation system work together to achieve efficient, energy-saving, and flexible electrolytic manganese production. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of an electrolytic cell unit;

[0034] Figure 2 This is a diagram of the power supply system architecture.

[0035] Figure 3 This is the circuit diagram of the power supply system;

[0036] Figure 4 This is a schematic diagram of the electrolyte circulation system.

[0037] Explanation of reference numerals in the attached drawings: 1. Electrolytic cell; 2. Electrolytic cell unit; 3. Positive electrode busbar; 4. Negative electrode busbar; 5. Electrolytic cell group; 6. Main transformer; 7. Secondary transformer; 8. Rectifier; 9. Power grid; 10. Cooler; 11. Electrolyte distribution device; 12. Electrolyte circulation device. Detailed Implementation

[0038] The present invention will be further described below with reference to embodiments. The description of the embodiments below is only for the purpose of helping to understand the present invention. It should be noted that those skilled in the art can make several modifications to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0039] Example 1

[0040] like Figure 1As shown, a modular electrolytic cell for electrolytic manganese divides 480 electrolytic cells into 10 independent electrolytic cell units 2 (in this embodiment, based on the conventional cleaning schedule for electrolytic manganese, the cells are cleaned every ten days; therefore, 10 electrolytic cell units 2 are arranged, and only one electrolytic cell unit 2 needs to be cleaned per day). Each electrolytic cell unit 2 contains 48 electrolytic cells, and the electrolytes between the various electrolytic cells are interconnected, forming an ion-conducting pathway for current. Each electrolytic cell unit 2 includes 4 parallel electrolytic cell groups 5 (e.g., ...). Figure 1 A row of electrolytic cells constitutes an electrolytic cell group), and each electrolytic cell group 5 includes 12 electrolytic cells connected in series (e.g., Figure 1 An electrolytic cell group 5 consists of 12 electrolytic cells connected in series. The anode of the first electrolytic cell in the group is electrically connected to the positive busbar 3 (a thick copper or aluminum busbar), and the cathode (i.e., the stainless steel cathode plate) of the last electrolytic cell in the group is electrically connected to the negative busbar 4. The positive busbar 3 and the negative busbar 4 are used to supply power to multiple electrolytic cell groups 5 connected in parallel (the wiring paths of the positive busbar 3 and the negative busbar 4 are symmetrical to ensure that the line impedance is basically the same and that the current distributed to each electrolytic cell group is uniform). Multiple electrolytic cells in the group are connected in series by conductive copper busbars. An insulating layer is provided between each electrolytic cell and the ground, and an insulating layer is also provided between adjacent electrolytic cells in the same group to prevent leakage.

[0041] like Figure 2 and Figure 3As shown, when supplying power to electrolytic cell unit 2, each electrolytic cell unit 2 is equipped with a corresponding rectifier 8 (using 10 high-efficiency in-phase inverter rectifier transformers with a rated DC output of 50kA / 60V, which is safer than the previous 480-750V high voltage), which can improve rectification efficiency. The failure of a single rectifier does not affect the production of other electrolytic cell units; the fault is isolated. Only the electrolytic cells in the corresponding electrolytic cell unit need to be shut down (if rectifier #1 needs maintenance or fails, only the electrolytic cells in that electrolytic cell unit need to be shut down). When a cathode-anode short circuit occurs in a single electrolytic cell, it will only lower the total voltage of that area. The impact is small, easy to troubleshoot, and has high production reliability; whereas in the original series-connected mode, a fault at any point would cause the entire production line to stop (in the traditional 100-140 electrolytic cells series mode, a fault at any point or a problem with one cell would cause the entire 100-140 electrolytic cells production line to stop). Electrolytic cell unit 2 is electrically connected to rectifier 8 to ensure a shorter DC power supply line (DC power is required when producing electrolytic manganese in the electrolytic cells, and the shorter the power supply line, the less DC transmission loss); rectifier 8 is electrically connected to transformer; the transformer is used to convert the AC power supplied by the power grid 9 into AC power. The AC power supply is stepped down from 220KV to AC 10KV. Rectifier 8 is used to output a lower voltage DC power to the electrolytic cell unit 2, replacing the traditional inefficient single rectifier connected in series throughout the entire production line. The transformer includes a main transformer 6 and multiple secondary transformers 7. The input side of each secondary transformer 7 is electrically connected to the main transformer 6, and the output side of each secondary transformer 7 is electrically connected to the corresponding rectifier 8. Testing the voltage of a single electrolytic cell becomes very direct and accurate; a voltmeter simply needs to be connected in parallel across the electrolytic cell. The main transformer 6 is used to step down the AC power supplied by the grid 9 to AC 10KV; the secondary transformers 7 are used to step down the AC power from AC 10KV to AC 400V, and further reduce the AC voltage. A 400V output is supplied to the rectifier connected to it. The rectifier 8 and the secondary transformer 7 are both arranged close to the corresponding electrolytic cell unit 2. The rectifier 8 is also electrically connected to a current stabilizing circuit, a voltage stabilizing circuit, a soft-start circuit, and a fault protection circuit to prevent abnormalities such as overcurrent, overvoltage, and temperature exceeding set values. This special power supply system architecture has the following advantages: it can reduce DC transmission losses and improve rectification efficiency; it has high reliability, and when a single rectifier fails, it will not affect the entire production line; only the electrolytic cell powered by the failed rectifier needs to be stopped; the special power supply system architecture facilitates phased maintenance, phased start-up / shutdown, and flexible production scheduling; it can provide more stable power to each electrolytic cell and precisely control the supplied current, resulting in more stable product quality from electrolytic manganese production and processing; when expansion is needed, the modular design allows for easy expansion by only adding rectifiers and corresponding electrolytic cells.

[0042] When using this modular electrolytic cell for electrolytic manganese production, each electrolytic cell unit 2 is equipped with a set of... Figure 4 The electrolyte circulation system shown (which controls electrolyte temperature and concentration in groups, improving overall electrolyte temperature uniformity and reducing concentration differences, thus minimizing current efficiency variations caused by these differences) ensures uniform electrolyte composition, reduces impurity accumulation, and improves product purity. The electrolyte circulation system includes: an electrolyte circulation device 12, a cooler 10, an electrolyte distribution device 11, a solution delivery pipe, and a solution delivery pump. Temperature testing devices are installed in both the electrolytic cell and the electrolyte circulation device 12 to test the electrolyte temperature within these devices, enabling precise control of the electrolysis process. The cathode chamber of the electrolytic cell is connected to the inlet of the electrolyte circulation device 12 via a solution delivery pipe, and the outlet of the electrolyte circulation device 12 is connected to... The electrolyte distribution device 11 is connected to the inlet of the electrolyte distribution device 11. The outlet of the electrolyte distribution device 11 is divided into multiple paths and connected to the anode chamber of the electrolytic cell through solution delivery pipes, realizing the circulation of electrolyte outside the electrolytic cell and reducing the consumption of new electrolyte. The electrolyte circulation device 12 is equipped with a cooler 10, which is used to cool the electrolyte in the electrolyte circulation device 12 (centralized cooling) to keep the electrolyte in the electrolytic cell below 39°C, so as to avoid the decrease in current efficiency due to Joule heating (such as electrolyte). When the temperature is above 45℃, the electrolysis efficiency will drop sharply. This improves the current efficiency (the cathode plate is under a higher current density, which enhances the hydrogen overvoltage, reduces side reactions, and ensures uniform and glossy metal deposition). Solution delivery pumps are installed on all solution delivery pipes. The electrolyte circulation device 12 is also equipped with a qualified electrolyte inlet and an ammonia inlet. The electrolyte circulation device 12 is also equipped with an overflow port, which is connected to the anode chamber of the electrolytic cell, used to overflow the electrolyte when the electrolyte circulation device 12 is full. The anode chamber of the electrolytic cell prevents electrolyte from overflowing from the electrolyte circulation device 12; a branch pipe is added to the solution delivery pipe connecting the electrolyte circulation device 12 and the electrolyte distribution device 11. The branch pipe is connected to the anode chamber of the electrolytic cell and is used to quickly replenish the anode chamber of the electrolytic cell with electrolyte of the appropriate temperature without going through the electrolyte distribution device 11, in order to cope with production scenarios where electrolyte needs to be introduced urgently; the cooler 10 is connected to the cooling circulating water inlet through the water inlet pipe and the cooling circulating water return water is discharged out through the water outlet pipe.

[0043] This arrangement significantly reduces the total resistance of all electrolytic cells (far less than the total resistance of all electrolytic cells connected in series), greatly reducing line losses. Each electrolytic cell unit can operate at a very low voltage (60V and below), compared to the traditional electrolytic cell arrangement which requires a high voltage of 480-750V. The electrolytic cell unit of this application has extremely high safety. During cell unloading, loading, and cleaning, each electrolytic cell unit 2 is unloaded, loaded, and cleaned independently without needing to reduce the voltage of other electrolytic cell units. Other electrolytic cell units can continue to electrolyze and produce manganese normally, improving operational flexibility. Each electrolytic cell unit can be inspected, started, and stopped in stages. By modularly designing multiple electrolytic cells to obtain electrolytic cell units, the scale can be adjusted by adding or removing modules, allowing for flexible adjustment of production capacity and easy expansion. When expanding production, only the number of electrolytic cell units needs to be increased.

[0044] The modular electrolytic cell used in this embodiment allows for flexible capacity allocation and a large output of electrolytic manganese: arranged with 480 electrolytic cells, each with 54 or 58 electrode plates, each electrolytic cell unit 2 can have up to 2784 electrode plates, and 10 electrolytic cell units 2 can have a total of 27840 electrode plates. Based on the calculation that the electrolytic manganese output per electrode plate is 3.6 kg, the annual output of electrolytic manganese can reach as high as 33074 tons.

[0045] The modular electrolytic cell used in this embodiment boasts high automation efficiency: 10 electrolytic cell units are equipped with a total of 27,840 electrode plates. Based on the current output rate of 1700 plates / hour, it would take 16.38 hours to output all electrode plates. Using 16-18 hours as the optimal electrolysis output cycle, the machinery can operate 24 hours a day, forming a three-shift work pattern, unrestricted by current personnel allocation and management. The modular layout of the electrolytic cell allows for continuous product output during electrolysis, with each unit producing 4 tons per hour, significantly improving production efficiency. A single electrolytic cell unit can output electrode plates within 2 hours, immediately increasing the current to the normal electrolysis range and improving electrolytic efficiency. In contrast, traditional electrolysis requires all cells to be output before increasing the current, affecting the normal electrolysis time.

[0046] Example 2

[0047] Based on Example 1, this embodiment's modular electrolytic cell divides 960 electrolytic cells into 10 independent electrolytic cell units 2, each containing 96 electrolytic cells. This embodiment uses 20 high-efficiency in-phase inverter rectifier transformers with a rated DC output of 50kA / 60V as rectifiers 8; each electrolytic cell unit includes 8 parallel electrolytic cell groups 5, and each electrolytic cell group 5 includes 12 electrolytic cells connected in series; and each cell feeding machine is equipped with two robotic arms and two post-processing lines.

[0048] It produces 8 tons per hour, and the annual output of electrolytic manganese can reach 63,360 tons.

Claims

1. A modular electrolytic cell for electrolytic manganese, characterized in that, It includes at least one electrolytic cell unit, each of which is independently powered; the electrolytic cell unit includes multiple electrolytic cell groups connected in parallel, and the electrolytic cell groups are composed of multiple electrolytic cells connected in series.

2. The modular electrolytic cell for electrolytic manganese according to claim 1, characterized in that: The number of electrolytic cell units is adjusted according to the electrolytic discharge time cycle of the factory's electrolytic manganese production. The longer the electrolytic discharge time cycle, the more electrolytic cell units are arranged.

3. The modular electrolytic cell for electrolytic manganese according to claim 1, characterized in that: The anodes of the first electrolytic cell in the electrolytic cell group are electrically connected to the positive busbar, and the cathodes of the last electrolytic cell in the electrolytic cell group are electrically connected to the negative busbar; the positive busbar and the negative busbar are used to supply power to the multiple electrolytic cell groups connected in parallel; the multiple electrolytic cells in the electrolytic cell group are connected in series through conductive copper busbars. An insulating layer is provided between each electrolytic cell and the ground, and an insulating layer is also provided between adjacent electrolytic cells within the same electrolytic cell group.

4. The modular electrolytic cell for electrolytic manganese according to claim 3, characterized in that: The wiring paths of the positive bus and the negative bus are symmetrical.

5. A power supply system for a modular electrolytic cell as described in any one of claims 1-4, characterized in that: The system is used to supply power to the modular electrolytic cells. The power supply system includes a transformer and multiple rectifiers. Each electrolytic cell unit is equipped with a corresponding rectifier nearby. The electrolytic cell unit is electrically connected to the rectifier to ensure a shorter DC power supply line. The rectifier is electrically connected to the transformer. The transformer is used to step down the AC power supplied by the grid. The rectifier is used to output the stepped-down AC power as DC power with a lower voltage and supply power to the electrolytic cell unit.

6. The power supply system according to claim 5, characterized in that: The transformer includes a main transformer and multiple secondary transformers. The input side of each secondary transformer is electrically connected to the main transformer, and the output side of each secondary transformer is electrically connected to the corresponding rectifier. The main transformer is used to step down the AC power supplied by the power grid to a first AC voltage value; the secondary transformer is used to step down the AC power from the first AC voltage value to a second AC voltage value, and output the second AC voltage value to a rectifier electrically connected thereto; the rectifier and the secondary transformer are both arranged close to the corresponding electrolytic cell unit. The rectifier is also electrically connected to a current stabilizing circuit, a voltage stabilizing circuit, a soft-start circuit, and a fault protection circuit.

7. The power supply system according to claim 6, characterized in that: The voltage supplied by the power grid is AC 220KV, the first AC voltage is AC 10KV, the second AC voltage is AC 400V, and the output voltage of the rectifier is DC 40~100V.

8. An electrolyte circulation system for cooling and circulating electrolyte in a modular electrolyzer as described in any one of claims 1-4, characterized in that, Each electrolytic cell unit is equipped with an electrolyte circulation system, which includes: an electrolyte circulation device, a cooler, an electrolyte distribution device, a solution delivery pipe, and a solution delivery pump. The cathode chamber of the electrolytic cell is connected to the inlet of the electrolyte circulation device via the solution delivery pipe, and the outlet of the electrolyte circulation device is connected to the inlet of the electrolyte distribution device via the solution delivery pipe. The outlet of the electrolyte distribution device is divided into multiple paths and connected to the anode chamber of the electrolytic cell via the solution delivery pipe. The electrolyte circulation device is equipped with a cooler to cool the electrolyte in the electrolyte circulation device, keeping the electrolyte in the electrolytic cell at 38-42°C. Each solution delivery pipe is equipped with a solution delivery pump.

9. The electrolyte circulation system according to claim 8, characterized in that: Both the electrolytic cell and the electrolyte circulation device are equipped with a temperature testing device, which is used to test the temperature of the electrolyte in the electrolytic cell and the electrolyte circulation device.

10. The electrolyte circulation system according to claim 8, characterized in that: The electrolyte circulation device is also equipped with a qualified electrolyte inlet and an ammonia inlet; The electrolyte circulation device is also provided with an overflow port, which is connected to the anode chamber of the electrolytic cell and is used to overflow the electrolyte into the anode chamber of the electrolytic cell when the electrolyte circulation device is full. A branch pipe is also added to the solution delivery pipe used to connect the electrolyte circulation device and the electrolyte distribution device. The branch pipe is connected to the anode chamber of the electrolytic cell. The branch pipe is used to quickly replenish the anode chamber of the electrolytic cell with electrolyte of the appropriate temperature without passing through the electrolyte distribution device. The cooler is connected to the cooling circulating water inlet and the cooling circulating water return outlet.

Images