Water electrolysis hydrogen production two-tower lossless purifying and drying device and sequential control method thereof

Abstract

The invention discloses a two-tower lossless purifying and drying device for producing hydrogen by electrolyzing water and a sequential control method of the two-tower lossless purifying and drying device. The input port of the three-way valve is connected with high-pressure hydrogen, and the first output port of the three-way valve is communicated with the first end of the first hydrogen return valve; a second output port of the three-way valve is communicated with the first end of the second hydrogen return valve; the second end of the first hydrogen return valve is communicated with the first end of the first drying tank; the second end of the first drying tank is communicated with the first end of the second drying tank; the second end of the second drying tank is communicated with the second end of the second hydrogen return valve; the third end of the second hydrogen return valve is communicated with the first end of the second cooler, and the second end of the second cooler is communicated with the first end of the gas-water separation tank; the second end of the gas-water separation tank is communicated with the first end of the flow regulating valve; the second end of the flow regulating valve is communicated with the first end of the first cooler, and the second end of the first cooler is communicated with the third end of the first hydrogen return valve. The regeneration interval period of the molecular sieve can be prolonged, so that the comprehensive hydrogen production energy consumption is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen production by electrolysis of water, and in particular to a two-tower lossless purification and drying device for hydrogen production by electrolysis of water and a timing control method thereof. Background Art

[0002] After exiting the cathode, hydrogen from electrolysis water (alkaline electrolysis, PEM electrolysis, AEM electrolysis) equipment typically passes through a dehydration separator for deoxygenation. After deoxygenation, it typically passes through a secondary dehydration separator to separate the deoxygenated liquid water before entering a drying unit (drying units typically have two or three-tower processes). Currently, two-tower processes typically waste some hydrogen as purge gas during regeneration and cooling. A three-tower process eliminates this waste (the purge gas is dried in the third tower and then added to the product hydrogen). In a two-tower process, Tower A operates while Tower B is in a regeneration or cooling state. After Tower A completes its operation, Tower A is regenerated and then cooled, while Tower B begins adsorption, and this cycle repeats. Currently, the most common timing control method uses fixed values ​​for the adsorption time T0, regeneration time T1, and cooling time T2. For example, T0 can be set to 12 hours, T1 to 4 hours, and T2 to 8 hours. These timings are typically set and debugged at the factory and are not modified subsequently. If they are modified, the operator must do so on the touchscreen. In the three-tower process, one tower is for adsorption, one tower is for regeneration or cooling, and one tower is for adsorption regeneration and purge gas. The timing is also working adsorption T0, regeneration T1, cooling T2, and the three towers operate alternately. For example, T0 is generally set to 8 hours, T2 is 8 hours, and T3 is also 8 hours. Like the two-tower process, the factory settings are generally not modified.

[0003] This control method has fixed adsorption and regeneration times. Often, the molecular sieve enters the regeneration stage before its capacity is fully utilized. During regeneration, heating is required (usually at a temperature of 200°C to 300°C). Heating consumes electrical power, thereby increasing the unit power consumption of hydrogen production. Summary of the Invention

[0004] The present invention provides a two-tower lossless purification and drying device for producing hydrogen by electrolysis of water and a timing control method thereof, which can greatly extend the regeneration interval period of the molecular sieve, thereby reducing power consumption and reducing the overall energy consumption of hydrogen production.

[0005] The present invention provides a two-tower lossless purification and drying device for producing hydrogen by electrolysis of water, comprising: a first drying tank, a second drying tank, a first temperature measuring component, a second temperature measuring component, a pressure sensor, a first hydrogen return valve, a second hydrogen return valve, a three-way valve, a first cooler, a second cooler, a flow regulating valve and a gas-water separation tank; the first temperature measuring component is arranged in the first drying tank; the second temperature measuring component is arranged in the second drying tank; the medium input port of the three-way valve is connected to high-pressure hydrogen, the first medium output port of the three-way valve is communicated with the first medium port of the first hydrogen return valve; the second medium output port of the three-way valve is communicated with the first medium port of the second hydrogen return valve; the second medium port of the first hydrogen return valve is communicated with the first medium port of the first drying tank; the first medium port of the first drying tank is connected to the second medium port of the first drying tank; the second medium port of the first hydrogen return valve is connected to the first medium port of the first drying tank; the second medium port of the first drying tank ... The second medium port is communicated with the first medium port of the second drying tank; the pressure sensor is arranged in the pipeline between the second medium port of the first drying tank and the first medium port of the second drying tank; the second medium port of the second drying tank is communicated with the second medium port of the second hydrogen return valve; the third medium port of the second hydrogen return valve is communicated with the first medium port of the second cooler, and the second medium port of the second cooler is communicated with the first medium port of the gas-water separation tank; the second medium port of the gas-water separation tank is communicated with the first medium port of the flow control valve; the second medium port of the flow control valve is communicated with the first medium port of the first cooler, and the second medium port of the first cooler is communicated with the third medium port of the first hydrogen return valve.

[0006] Specifically, it also includes: a drain valve; the drain valve is arranged at the medium output port of the gas-water separation tank.

[0007] Specifically, it also includes: an electrolytic cell, a primary gas-water separation device, a deoxygenation device and a secondary gas-water separation device; the medium output port of the electrolytic cell is connected to the medium input port of the primary gas-water separation device, the medium output port of the primary gas-water separation device is connected to the medium input port of the deoxygenation device, and the medium output port of the deoxygenation device is connected to the medium input port of the secondary gas-water separation device.

[0008] Specifically, it also includes: a current monitoring component; the current monitoring component is arranged in the electrolytic cell.

[0009] The present invention also provides a timing control method for a two-tower lossless purification and drying device for producing hydrogen by electrolysis of water, which is applicable to the two-tower lossless purification and drying device for producing hydrogen by electrolysis of water as described above, comprising:

[0010] By formula The hydrogen production rate s is calculated; where n is the number of electrolytic cells and I is the electrolytic current of the electrolytic cell;

[0011] By formula The cumulative hydrogen production is calculated; T0 is the time when the drying tank adsorption starts, and T1 is the current time;

[0012] By formula Calculate the total amount of water m in the cumulative hydrogen production; where T is the dew point temperature and p is the pressure in the pipeline;

[0013] The theoretical water absorption rate A of the molecular sieve is calculated by the formula A=0.8×M×a%, where M is the mass of the molecular sieve and a% is the water absorption rate.

[0014] If the total amount of water m in the cumulative hydrogen production reaches a preset percentage of the theoretical water absorption rate A of the molecular sieve, the working states of the first drying tank and the second drying tank are switched.

[0015] One or more technical solutions provided in the present invention have at least the following technical effects or advantages:

[0016] The first temperature measuring component is arranged in the first drying tank; the second temperature measuring component is arranged in the second drying tank; the medium input port of the three-way valve is connected to high-pressure hydrogen, and the first medium output port of the three-way valve is communicated with the first medium port of the first hydrogen return valve; the second medium output port of the three-way valve is communicated with the first medium port of the second hydrogen return valve; the second medium port of the first hydrogen return valve is communicated with the first medium port of the first drying tank; the second medium port of the first drying tank is communicated with the first medium port of the second drying tank; the pressure sensor is arranged in the pipeline between the second medium port of the first drying tank and the first medium port of the second drying tank; the second medium port of the second drying tank is communicated with the second medium port of the second hydrogen return valve; the third medium port of the second hydrogen return valve is communicated with the first medium port of the second cooler, and the second medium port of the second cooler is communicated with the first medium port of the gas-water separation tank; the second medium port of the gas-water separation tank is communicated with the first medium port of the flow regulating valve; the second medium port of the flow regulating valve is communicated with the first medium port of the first cooler, and the second medium port of the first cooler is communicated with the third medium port of the first hydrogen return valve. The two-tower purification drying device designed by the present invention has a structure in which, when one drying tank is operating and the other drying tank is regenerating or cooling, the regenerated gas or cooling gas flows back through the hydrogen return valve to the dried hydrogen for regeneration or cooling. The regenerated gas or cooling gas is mixed with the raw gas at the drying tank inlet and re-enters the drying tank for drying, thereby achieving the goal of not wasting product gas. Its structure is simpler and less expensive than that of a three-tower adsorption system. The adsorption operation of this two-tower device adopts a dynamic timing control method, that is, the aforementioned T0 is not fixed, but is automatically compared with parameters such as the quality of the adsorbed hydrogen (i.e., the theoretical total amount of hydrogen produced during the adsorption period), the dew point temperature upon entry into the drying device, the pipeline pressure, the quality of the molecular sieve, and the molecular sieve's water adsorption rate. The mass of the adsorbed water is compared with the theoretical adsorption capacity of the molecular sieve in real time. When the mass of the adsorbed water approaches the adsorption capacity of the molecular sieve, the drying tank begins to enter the regeneration state. In this way, when the dew point temperature is relatively low, or the hydrogen production does not reach the rated hydrogen production, or the pipeline pressure is relatively high (a single factor or a combination of multiple factors), the adsorption time of the drying tank can be more than twice the fixed set time, up to more than 10 times. This control method can greatly extend the regeneration interval of the molecular sieve, thereby reducing electricity consumption and reducing the overall hydrogen production energy consumption.

[0017] Specifically, the present invention has the following advantages over existing purification and drying devices and timing control methods:

[0018] 1. The present invention's newly adopted two-tower control process creatively utilizes a hydrogen return valve to reflux the dried product hydrogen, providing purge gas for regeneration and cooling. The purge gas then re-enters the drying tank through the hydrogen return port of the hydrogen return valve, ensuring hydrogen quality (hydrogen purity can reach 5N or even 7N) while avoiding hydrogen waste. Traditional two-tower drying systems waste approximately 10% of hydrogen as purge gas, which is then directly discharged after the purge is complete and cannot be used as product gas (because the purge gas contains gaseous water and does not meet hydrogen quality requirements). Compared to traditional three-tower drying solutions, this present invention ensures hydrogen quality while maintaining a simple structure, smaller size, and lower cost.

[0019] 2. The present invention creatively adopts a dynamic drying timing control method, which can save more energy and reduce the comprehensive hydrogen production power consumption compared with the traditional timing control method. Before adopting this solution, the existing control method is to regenerate and adsorb tank A for 12 hours (at the same time, tank B is heated and regenerated for 4 hours and then cooled for 8 hours), then regenerate and adsorb tank B for 12 hours (at the same time, tank A is heated and regenerated for 4 hours and then cooled for 8 hours), and then tank A is switched to continue adsorption, and the cycle continues. If the data of Example 1 is used, usually at 3Nm 3 When producing hydrogen, the drying tank is equipped with a 1kW heater. Conventional control schemes require heating for 8 hours every 24 hours. At a 1kW heater, this consumes approximately 8 kWh of electricity per 24 hours. However, the sequential control method of the present invention only requires 4 hours of heating every 500 hours and 8 hours every 1000 hours. This translates to a power consumption of 8 kWh per 1000 hours. Conventional control methods consume over 40 times more energy than this method. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic structural diagram of a two-tower lossless purification and drying device for producing hydrogen by electrolysis of water provided in an embodiment of the present invention;

[0021] Figure 2 Flow chart of a timing control method for a two-tower lossless purification and drying device for producing hydrogen by electrolysis of water provided in an embodiment of the present invention;

[0022] Among them, 1-first drying tank, 2-second drying tank, 3-pressure sensor, 4-first hydrogen return valve, 5-second hydrogen return valve, 6-three-way valve, 7-first cooler, 8-second cooler, 9-flow regulating valve, 10-gas-water separation tank, 11-drain valve, 12-first temperature measuring component, 13-second temperature measuring component. DETAILED DESCRIPTION

[0023] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0024] like Figure 1As shown, the two-tower lossless purification and drying device for producing hydrogen by electrolysis of water provided in an embodiment of the present invention includes: a first drying tank 1, a second drying tank 2, a first temperature measuring component 12, a second temperature measuring component 13, a pressure sensor 3, a first hydrogen return valve 4, a second hydrogen return valve 5, a three-way valve 6, a first cooler 7, a second cooler 8, a flow regulating valve 9 and a gas-water separation tank 10; the first temperature measuring component 12 is arranged in the first drying tank 1; the second temperature measuring component 13 is arranged in the second drying tank 2; the medium input port of the three-way valve 6 is connected to high-pressure hydrogen, and the first medium output port of the three-way valve 6 is connected to the first medium port of the first hydrogen return valve 4; the second medium output port of the three-way valve 6 is connected to the first medium port of the second hydrogen return valve 5; the second medium port of the first hydrogen return valve 4 is connected to the first medium port of the first drying tank 1 The second medium port of the first drying tank 1 is connected with the first medium port of the second drying tank 2; the pressure sensor 3 is arranged in the pipeline between the second medium port of the first drying tank 1 and the first medium port of the second drying tank 2; the second medium port of the second drying tank 2 is connected with the second medium port of the second hydrogen return valve 5; the third medium port of the second hydrogen return valve 5 is connected with the first medium port of the second cooler 8, and the second medium port of the second cooler 8 is connected with the first medium port of the gas-water separation tank 10; the second medium port of the gas-water separation tank 10 is connected with the first medium port of the flow regulating valve 9; the second medium port of the flow regulating valve 9 is connected with the first medium port of the first cooler 7, and the second medium port of the first cooler 7 is connected with the third medium port of the first hydrogen return valve 4.

[0025] The structure of the two-tower lossless purification and drying device for producing hydrogen by electrolysis of water provided in an embodiment of the present invention is specifically described, and further comprises: a drain valve 11 ; the drain valve 11 is arranged at the medium output port of the gas-water separation tank 10 .

[0026] The structure of the two-tower lossless purification and drying device for hydrogen production by electrolysis of water provided in an embodiment of the present invention is further described, which also includes: an electrolytic cell, a primary gas-water separation device, a deoxygenation device and a secondary gas-water separation device; the medium output port of the electrolytic cell is connected to the medium input port of the primary gas-water separation device, the medium output port of the primary gas-water separation device is connected to the medium input port of the deoxygenation device, and the medium output port of the deoxygenation device is connected to the medium input port of the secondary gas-water separation device.

[0027] The structure of the two-tower lossless purification and drying device for producing hydrogen by electrolysis of water provided in an embodiment of the present invention is further described, and further includes: a current monitoring component; the current monitoring component is arranged in the electrolytic cell.

[0028] The working principle of the purification and drying device provided in the embodiment of the present invention is described in detail below:

[0029] The hydrogen coming out of the cathode outlet of the electrolyzer passes through the primary gas-water separation equipment, the deoxidation equipment and the secondary gas-water separation equipment and then passes through the three-way valve 6 (such as when the first drying tank 1 is working for adsorption). The high-pressure hydrogen passes through the three-way valve 6 to reach the first hydrogen return valve 4. The first hydrogen return valve 4 adopts the Bernoulli principle valve and consists of three ports, namely the high-pressure air inlet, the hydrogen return port and the hydrogen outlet. The hydrogen enters the first hydrogen return valve 4 through the high-pressure air inlet, and the hydrogen refluxed from the hydrogen return port driven by the high-speed airflow is mixed into mixed hydrogen at the hydrogen outlet, flows through the first drying tank 1, and is discharged into the first drying tank 1. The molecular sieve in the tank 1 absorbs moisture in the hydrogen, and the dry hydrogen after adsorption passes through the outlet of the first drying tank 1. Most of the hydrogen coming out of the outlet of the first drying tank 1 reaches the product hydrogen outlet of the entire device, and a small part (the flow rate of the regenerated gas can be adjusted by the flow control valve 9) is driven by the high-speed and high-pressure hydrogen of the second hydrogen return valve 5, passes through the second drying tank 2, flows through the outlet of the second hydrogen return valve 5, the hydrogen return port of the second hydrogen return valve 5, and then passes through the second cooler 8, the gas-water separation tank 10, the flow control valve 9 and the first cooler 7, and reaches the hydrogen return port of the first hydrogen return valve 4.

[0030] After the first drying tank 1 is saturated with adsorption, it switches to the second drying tank 2 for adsorption operation. The first drying tank 1 is first regenerated and then cooled. The working state of the second drying tank 2 is as follows: the hydrogen from the gas-water separator reaches the three-way valve 6. The high-pressure hydrogen flows through the three-way valve 6 to the high-pressure air inlet of the second hydrogen return valve 5. The second hydrogen return valve 5 also adopts the Bernoulli principle valve. The high-pressure hydrogen enters the second hydrogen return valve 5 and drives the hydrogen at the hydrogen return port to flow from the outlet of the second hydrogen return valve 5 to the second drying tank 2 at a high speed. In the second drying tank 2, the molecular sieve absorbs the water in the hydrogen. The dried hydrogen after adsorption passes through the outlet of the second drying tank 2. Most of the hydrogen reaches the hydrogen production outlet of the entire device. A small amount of hydrogen (the flow rate of regenerated gas can be adjusted by the flow control valve 9) passes through the first drying tank 1 and the outlet of the first hydrogen return valve 4 to the hydrogen return port of the first hydrogen return valve 4. It flows through the first cooler 7, the flow control valve 9, the gas-water separator and the second cooler 8, and finally mixes with the raw hydrogen in the second hydrogen return valve 5.

[0031] like Figure 2 As shown, the timing control method of the two-tower lossless purification and drying device for producing hydrogen by electrolysis of water provided in an embodiment of the present invention is applicable to the two-tower lossless purification and drying device for producing hydrogen by electrolysis of water as described above, comprising:

[0032] By formula The hydrogen production rate s is calculated; where n is the number of electrolytic cells and I is the electrolytic current of the electrolytic cell;

[0033] By formula The cumulative hydrogen production is calculated; T0 is the time when the drying tank adsorption starts, and T1 is the current time;

[0034] By formula The total amount of water m in the cumulative hydrogen production is calculated; where T is the dew point temperature, that is, the temperature of the hydrogen after water separation is T (°C), and p is the pressure in the pipeline;

[0035] The theoretical water absorption rate A of the molecular sieve is calculated by the formula A=0.8×M×a%, where M is the mass of the molecular sieve and a% is the water absorption rate.

[0036] If the total amount of water m in the cumulative hydrogen production reaches a preset percentage of the theoretical water absorption rate A of the molecular sieve, the operating state of the first drying tank 1 and the second drying tank 2 is switched. Specifically, when m≈95%A, the adsorption of this drying tank is completed and it starts to switch to the regeneration state, and the adsorption of the other drying tank is switched to the other drying tank. This cycle repeats. Example 1:

[0037] The mass of molecular sieve in a single drying tank is M = 3200 g, the adsorption rate a% = 26%, the electrolysis current is I = 720 A (for the convenience of calculation, assume that I is stable at this value), the number of pieces n = 10 pieces, the dew point temperature T = 10°C, the pipeline pressure P = 2.6 MPa, and the start time is 0.

[0038] The hydrogen production rate calculated by the formula s = 0.00696*n*I = 50.11 (SLPM)

[0039] Calculated by the formula: A = 0.8 * 3200 * 26% = 665.6 (g)

[0040] The total amount of hydrogen produced in one hour is calculated by the formula V(H2) = 50.11*60 / 1000≈3(Nm 3 )

[0041] Calculate the amount of water m in hydrogen in 1 hour by the formula

[0042]

[0043] A / m=665.6 / 1.15≈578 hours, that is, under this working condition, the first drying tank 1 needs to be regenerated after continuously working for at least 500 hours of adsorption.

[0044] Example 2:

[0045] The mass of molecular sieve in a single drying tank is M = 3200 g, the adsorption rate a% = 26%, the electrolysis current is I = 720 A (for the convenience of calculation, assume that I is stable at this value), the number of pieces is n = 10, the dew point temperature is T = 25 ° C, the pipeline pressure is P = 1 MPa, and the start time is 0.

[0046] The amount of water in hydrogen per hour is calculated by the formula m = 7.65g.

[0047] A / m=665.6 / 7.65≈87 hours

[0048] It can be seen that the working time of the drying tank under the working condition of Example 1 is more than 6 times that of the drying tank under the working condition of Example 2.

[0049] In summary, the embodiment of the present invention provides a two-tower lossless purification and drying device for hydrogen production by electrolysis of water and a timing control method thereof, which can greatly extend the regeneration interval of the molecular sieve, thereby reducing power consumption and reducing the overall hydrogen production energy consumption.

[0050] It will be understood by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0051] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0052] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0053] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0054] Any details not described in the embodiments of the present invention are well-known to those skilled in the art. Finally, it should be noted that the above embodiments are only intended to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention may be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or equivalents should be included in the scope of the claims of the present invention.

Claims

1. A two-tower lossless purification and drying device for producing hydrogen by electrolysis of water, characterized in that: include: A first drying tank, a second drying tank, a first temperature measuring component, a second temperature measuring component, a pressure sensor, a first hydrogen return valve, a second hydrogen return valve, a three-way valve, a first cooler, a second cooler, a flow regulating valve and a gas-water separation tank; the first temperature measuring component is arranged in the first drying tank; the second temperature measuring component is arranged in the second drying tank; the medium input port of the three-way valve is connected to high-pressure hydrogen, the first medium output port of the three-way valve is connected to the first medium port of the first hydrogen return valve; the second medium output port of the three-way valve is connected to the first medium port of the second hydrogen return valve; the second medium port of the first hydrogen return valve is connected to the first medium port of the first drying tank; the second medium port of the first drying tank is connected to the second drying tank The first medium port is connected; the pressure sensor is arranged in the pipeline between the second medium port of the first drying tank and the first medium port of the second drying tank; the second medium port of the second drying tank is connected to the second medium port of the second hydrogen return valve; the third medium port of the second hydrogen return valve is connected to the first medium port of the second cooler, and the second medium port of the second cooler is connected to the first medium port of the gas-water separation tank; the second medium port of the gas-water separation tank is connected to the first medium port of the flow control valve; the second medium port of the flow control valve is connected to the first medium port of the first cooler, and the second medium port of the first cooler is connected to the third medium port of the first hydrogen return valve.

2. The two-tower lossless purification and drying device for producing hydrogen by electrolysis of water according to claim 1, characterized in that: Also includes: Drain valve; the drain valve is arranged at the medium output port of the gas-water separation tank.

3. The two-tower lossless purification and drying device for producing hydrogen by electrolysis of water according to claim 1 or 2, characterized in that: Also includes: An electrolytic cell, a primary gas-water separation device, a deoxidation device, and a secondary gas-water separation device; the medium output port of the electrolytic cell is connected to the medium input port of the primary gas-water separation device, the medium output port of the primary gas-water separation device is connected to the medium input port of the deoxidation device, and the medium output port of the deoxidation device is connected to the medium input port of the secondary gas-water separation device.

4. The two-tower lossless purification and drying device for producing hydrogen by electrolysis of water as claimed in claim 3, characterized in that: Also includes: Current monitoring components; The current monitoring component is arranged in the electrolytic cell.

5. A timing control method for a two-tower lossless purification and drying device for producing hydrogen by electrolysis of water, applicable to the two-tower lossless purification and drying device for producing hydrogen by electrolysis of water according to any one of claims 1 to 4, characterized in that: include: By formula The hydrogen production rate s is calculated; where n is the number of electrolytic cells and I is the electrolytic current of the electrolytic cell; By formula The cumulative hydrogen production is calculated; T0 is the time when the drying tank adsorption starts, and T1 is the current time; By formula Calculate the total amount of water m in the cumulative hydrogen production; where T is the dew point temperature and p is the pressure in the pipeline; The theoretical water absorption rate A of the molecular sieve is calculated by the formula A=0.8×M×a%, where M is the mass of the molecular sieve and a% is the water absorption rate. If the total amount of water m in the cumulative hydrogen production reaches a preset percentage of the theoretical water absorption rate A of the molecular sieve, the working states of the first drying tank and the second drying tank are switched.

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