Waste heat recovery device applied to hydrogen production through seawater electrolysis under fluctuating working conditions and control method of waste heat recovery device

Abstract

The invention discloses a waste heat recovery device applied to hydrogen production through seawater electrolysis under fluctuating working conditions and a control method thereof.The waste heat recovery device comprises a seawater evaporation device used for evaporating seawater so as to generate raw material desalted water for hydrogen production; the cooling device is used for cooling the electrolyte of the system; and the concentration analysis device is used for analyzing the salinity of the condensed water, discharging out-of-standard fresh water and supplying qualified fresh water to the electrolytic bath. The control method comprises the following steps: acquiring the working power change of the electrolytic cell according to the load operation condition of the electrolytic cell, and then sending a control instruction according to the working power change of the electrolytic cell to control the seawater flow to increase or decrease and control the water yield of the waste heat recovery device to adapt to the electrolysis requirement of the electrolytic cell. The water production device and the cooling device are controlled to be increased or decreased according to the change condition of the working power of the electrolytic cell, it is guaranteed that the waste heat recovery device can synchronously act when the power of the electrolytic cell changes, and the problem that water is insufficient or the temperature is out of control due to system fluctuation is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen production by electrolysis of seawater, and in particular to a waste heat recovery device and a control method thereof applied to hydrogen production by electrolysis of seawater under fluctuating working conditions. Background Art

[0002] As the global demand for clean energy grows, seawater electrolysis has attracted widespread attention as a sustainable hydrogen production technology. This technology uses electricity to electrolyze seawater into hydrogen and oxygen, has the advantages of abundant raw materials and environmental friendliness, and has important application prospects in the development of renewable energy storage and hydrogen energy industry.

[0003] However, there are some problems that need to be solved in the process of electrolyzing seawater to produce hydrogen. Among them, waste heat management is a key aspect. In the electrolysis reaction, a large amount of electrical energy will be converted into thermal energy, causing the electrolyzer and its peripheral equipment to operate at a higher temperature. If this waste heat cannot be effectively recovered and utilized, it will not only cause energy waste, but may also affect the stability and safety of the electrolysis system and reduce the efficiency of hydrogen production.

[0004] Traditional seawater electrolysis hydrogen production systems usually use relatively simple heat dissipation methods, such as natural air cooling or water cooling, to discharge waste heat directly into the environment. This method fails to fully tap the potential value of waste heat. Especially under fluctuating operating conditions, such as the intermittent and unstable power generation of renewable energy (such as solar energy and wind energy), which causes the input power of the electrolyzer to fluctuate, the heat generation rate during the electrolysis process will also change continuously, making waste heat recovery more difficult. The unstable waste heat supply puts higher requirements on the adaptability and control accuracy of the recovery device. Traditional waste heat recovery technology is difficult to meet the needs of efficient recovery under such fluctuating conditions.

[0005] In addition, the corrosiveness and impurity content of seawater are also important factors affecting the design and operation of waste heat recovery devices. Seawater is rich in salt, microorganisms and other corrosive and scaling substances, which will cause erosion and blockage on the heat exchange surface of the recovery device, reduce heat transfer efficiency, increase equipment maintenance costs and operating risks. Therefore, the development of a device and control method that can adapt to fluctuating operating conditions, efficiently recover waste heat from electrolysis of seawater for hydrogen production, and have good corrosion resistance has important practical significance and engineering application value.

[0006] In summary, in order to address the problem of waste heat recovery in the process of hydrogen production by electrolysis of seawater, especially the challenges under fluctuating operating conditions, an innovative solution is urgently needed to improve energy utilization efficiency, reduce hydrogen production costs, and promote the development of hydrogen production technology by electrolysis of seawater in a more sustainable and efficient direction.

[0007] In order to solve the above problems, the present invention is proposed. Summary of the invention

[0008] In view of the above problems, the present invention proposes a waste heat recovery device and a control method for hydrogen production by electrolysis of seawater under fluctuating operating conditions. Instructions are issued according to the different operating loads of the electrolyzer. When the electrolyzer is operating at a low load, the waste heat recovery device is controlled to reduce the water production accordingly, and when the electrolyzer is operating at a high load, the water production is increased accordingly.

[0009] The present invention discloses a waste heat recovery device for electrolyzing seawater to produce hydrogen under fluctuating working conditions and a control method thereof. The waste heat recovery device includes a seawater evaporation device for evaporating seawater to produce desalted water as a raw material for hydrogen production; a cooling device for cooling the system electrolyte; and a concentration analysis device for analyzing the salinity of the water after condensation, and discharging excess fresh water and supplying qualified fresh water to the electrolyzer. The control method of the present invention includes: obtaining the change in the working power of the electrolyzer, and then issuing a control instruction based on the change in the working power of the electrolyzer to control the increase or decrease of the seawater flow rate, and controlling the water production of the waste heat recovery device to meet the needs of electrolysis in the electrolyzer. The increase or decrease of the water production device and the cooling device is controlled by the change in the working power of the electrolyzer to ensure that the waste heat recovery device can act synchronously when the power of the electrolyzer changes, so as to avoid the problem of insufficient water or temperature out of control due to system fluctuations.

[0010] A first aspect of the present invention provides a waste heat recovery device for electrolyzing seawater to produce hydrogen under fluctuating conditions, the waste heat recovery device comprising a seawater evaporation device, a cooling device and a concentration analysis device;

[0011] The seawater evaporation device comprises an electrolyte inlet pipeline 1, an electrolyte outlet pipeline 2, an overflow pipeline 14, a concentrated seawater extraction pipeline 16, an ejector 12, an evaporation chamber 9, a water supply pipeline 8, a demister 11, and a vacuum pipeline 15; the electrolyte inlet pipeline 1 and the electrolyte outlet pipeline 2 provide a heat source for evaporation to the seawater evaporation device, the overflow pipeline 14 allows excess seawater to overflow out of the seawater evaporation device, the concentrated seawater extraction pipeline 16 extracts seawater with excessively high concentration in the seawater evaporation device, the ejector 12 lowers the boiling point of water, the evaporation chamber 9 evaporates part of the seawater into hot steam, the water supply pipeline 8 provides fresh seawater to the seawater evaporation device, the demister 11 is used to separate salt mist entering the condensation chamber 10 from the evaporation chamber 9, and the vacuum pipeline 15 is used to lower the boiling temperature of water in the seawater evaporation device;

[0012] The cooling device comprises a cooling seawater inlet pipeline 20, a cooling seawater outlet pipeline 5, and the condensation chamber 10. The cooling seawater inlet pipeline 20 and the cooling seawater outlet pipeline 5 are used to provide cooling medium to the cooling device, and the condensation chamber 10 is used to provide a place for the cooling device;

[0013] The concentration analysis device comprises a salinity probe 6 and a condensate pump 7. The salinity probe 6 is used by the concentration analysis device to analyze the salt content of condensed water, and the condensate pump 7 is used to draw out the condensed water required by the concentration analysis device.

[0014] Preferably, the electrolyte inlet pipeline 1 further includes a TT1 temperature transmitter 17, and the electrolyte outlet pipeline 2 further includes a TT2 temperature transmitter 18. The TT1 temperature transmitter 17 and the TT2 temperature transmitter 18 are used to collaboratively detect the electrolyte temperature of the system.

[0015] Preferably, the cooling seawater inlet pipeline 20 further includes a FIT1 seawater flowmeter 21, and the FIT1 seawater flowmeter 21 is used to monitor the seawater flow; the cooling seawater outlet pipeline 5 further includes a seawater pump 13, and the seawater pump 13 is used to provide power for the cooling seawater.

[0016] Preferably, the ejector 12 is installed on the cooling seawater inlet pipeline 20, and the ejector 12 is also connected to the vacuum pipeline 15 and the concentrated seawater extraction pipeline 16 in the seawater evaporation device. The ejector 12 is used to reduce the boiling temperature of water in the seawater evaporation device.

[0017] Preferably, the outlet of the salinity meter probe 6 in the concentration analysis device is divided into an excessive fresh water outlet pipeline 4 and a qualified fresh water outlet pipeline 3 .

[0018] Preferably, a TV1 pneumatic diaphragm regulating valve 19 is provided on the water supply pipeline 8 for adjusting the seawater replenishment flow rate.

[0019] Preferably, the overflow pipeline 14 is provided with a downward U-bend in the evaporation chamber 9 for extracting seawater with a higher salinity at the bottom of the evaporation chamber.

[0020] A second aspect of the present invention provides a control method for a waste heat recovery device for electrolyzing seawater to produce hydrogen under fluctuating operating conditions, the control method comprising: obtaining changes in the working power of the electrolyzer according to the load operation of the electrolyzer, and then issuing control instructions based on the changes in the working power of the electrolyzer to control the seawater flow rate to increase or decrease, and controlling the water output of the waste heat recovery device to meet the needs of electrolysis in the electrolyzer.

[0021] Specifically, when the electrolytic cell is running at high load, the waste heat recovery device is controlled to produce more water to meet the electrolysis needs of the electrolytic cell;

[0022] When the electrolytic cell is running at low load, the waste heat recovery device is controlled to produce less water to balance the electrolysis requirements of the electrolytic cell.

[0023] Preferably, when the load of the electrolytic cell fluctuates, the waste heat of the electrolytic cell will also change accordingly. The change in waste heat will in turn cause the temperature of the electrolyte entering the waste heat recovery device to change, thereby affecting the latent heat required for evaporation. The seawater replenishment flow rate corresponding to the latent heat change also needs to change to meet the change in water consumption.

[0024] Preferably, when the electrolytic cell load fluctuates, the regulation logic of the waste heat recovery device is as follows:

[0025] S1, change of electrolytic cell working power;

[0026] S2, change of waste heat from electrolyzer;

[0027] S3, the change in latent heat required for evaporation of seawater in the waste heat recovery device;

[0028] S4, the change in the amount of seawater required to cool;

[0029] S5, the seawater replenishment flow rate changes accordingly;

[0030] Among them, the hydrogen production of 1 standard cubic meter per hour corresponds to the water demand of 1L per hour;

[0031] Hydrogen production = chamber current × number of chambers / 2390.

[0032] Specifically, the following steps are included:

[0033] ① Changes in the working power of the electrolytic cell;

[0034] ② Changes in waste heat from electrolytic cells;

[0035] ③ Determination: whether the value of TT1 temperature transmitter 17 rises, if yes, increase the flow of seawater pump 13, reduce the opening of TV1 pneumatic diaphragm regulating valve 19, and increase the waste heat recovery water production; if no, reduce the flow of seawater pump 13, increase the opening of TV1 pneumatic diaphragm regulating valve 19, and reduce the waste heat recovery water production;

[0036] ④ Determination: whether the water production matches the change in electrolytic cell power. If so, maintain the seawater pump flow and the opening of the pneumatic diaphragm regulating valve, and match the waste heat recovery device with the electrolytic cell power; if not, return to step ③.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] The present invention controls the increase or decrease of the water production device and the cooling device through the change of the working power of the electrolytic cell, ensuring that the waste heat recovery device can operate synchronously when the power of the electrolytic cell changes, avoiding the problem of insufficient water or temperature out of control due to system fluctuations. According to the different operating loads of the electrolytic cell, that is, under fluctuating conditions, the waste heat recovery device of the present invention can also adjust the output water volume according to the corresponding fluctuations and effectively control the system temperature. Therefore, it can avoid problems such as system operation failures caused by excessive or insufficient waste heat recovery water production during the fluctuating operation of the electrolytic cell, thereby improving the reliability of the waste heat recovery device and expanding its application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 To invent a waste heat recovery process flow chart;

[0040] Figure 2 This is the adjustment logic diagram in the control method of the present invention.

[0041] The names of the figure symbols in the figure description are: 1. electrolyte inlet pipeline, 2. electrolyte outlet pipeline, 3. qualified fresh water outlet pipeline, 4. excessive fresh water outlet pipeline, 5. cooling seawater outlet pipeline, 6. salinity meter probe, 7. condensate pump, 8. water supply pipeline, 9. evaporation chamber, 10. condensation chamber, 11. demister, 12. ejector, 13. seawater pump, 14. overflow pipeline, 15. vacuum pipeline, 16. concentrated seawater extraction pipeline, 17. temperature transmitter TT1, 18. temperature transmitter TT2, 19. pneumatic diaphragm regulating valve TV1, 20. cooling seawater inlet pipeline, 21. FIT1 seawater flowmeter. DETAILED DESCRIPTION

[0042] The present invention is further described in detail below in conjunction with embodiments.

[0043] Those skilled in the art will appreciate that the following examples are only used to illustrate the present invention and should not be considered to limit the scope of the present invention. If no specific techniques or conditions are specified in the examples, the techniques or conditions described in the literature in the art or the product specifications are used. If the manufacturer of the materials or equipment used is not specified, they are all conventional products that can be purchased.

[0044] Those skilled in the art will appreciate that, unless expressly stated otherwise, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" to another element, it may be directly connected to the other element, or there may be intermediate elements. In addition, the "connection" used herein may include wireless connections.

[0045] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two. The terms "inside", "upper", "lower", etc., indicating positions or state relationships, are based on the positions or state relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operate in a specific position, and therefore cannot be understood as limiting the present invention.

[0046] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "provided with" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention will be understood according to specific circumstances.

[0047] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as those generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0048] Example

[0049] like Figure 1As shown, the present embodiment is a waste heat recovery device for electrolyzing seawater to produce hydrogen under fluctuating working conditions and a control method thereof, wherein the waste heat recovery device comprises: an electrolyte inlet pipeline 1, an electrolyte outlet pipeline 2, a qualified fresh water outlet pipeline 3, an excessive fresh water outlet pipeline 4, a cooling seawater outlet pipeline 5, a salinity meter probe 6, a condensate pump 7, a water supply pipeline 8, an evaporation chamber 9, a condensation chamber 10, a demister 11, an ejector 12, a seawater pump 13, an overflow pipeline 14, a vacuum pipeline 15, a concentrated seawater extraction pipeline 16, a TT1 temperature transmitter 17, a TT2 temperature transmitter 18, a TV1 pneumatic diaphragm regulating valve 19, a cooling seawater inlet pipeline 20, and a FIT1 seawater flowmeter 21;

[0050] The waste heat recovery device includes a seawater evaporation device, a cooling device and a concentration analysis device. The seawater evaporation device includes an electrolyte inlet pipeline 1, an electrolyte outlet pipeline 2, an overflow pipeline 14, a concentrated seawater extraction pipeline 16, an ejector 12, an evaporation chamber 9, a water supply pipeline 8, a demister 11, and a vacuum extraction pipeline 15. The electrolyte inlet and outlet pipelines 1 and the electrolyte outlet pipeline 2 provide a heat source for evaporation to the seawater evaporation device. The overflow pipeline 14 overflows the excess seawater out of the seawater evaporation device. The concentrated seawater extraction pipeline 16 extracts the seawater with excessively high concentration in the seawater evaporation device. The ejector 12 lowers the boiling point of water. The evaporation chamber 9 partially Seawater evaporates and turns into hot steam. The water supply pipeline 8 provides fresh seawater to the seawater evaporation device. The demister 11 is used to separate the salt mist in the seawater evaporation device. The vacuum pipeline 15 reduces the boiling temperature of the water in the seawater evaporation device. The cooling device includes a cooling seawater inlet and outlet pipeline 5 and a condensation chamber 10. The cooling seawater inlet and outlet pipeline is used to provide cooling medium to the cooling device, and the condensation chamber is used to provide a place for the cooling device. The concentration analysis device includes a salinity probe 6 and a condensate pump 7. The salinity probe is used for the concentration analysis device to analyze the salt content of condensed water, and the condensate pump is used to draw out the condensed water required by the concentration analysis device.

[0051] The electrolyte inlet pipeline 1 further includes a TT1 temperature transmitter 17, and the electrolyte outlet pipeline 2 further includes a TT2 temperature transmitter 18. The TT1 temperature transmitter 17 and the TT2 temperature transmitter 18 are used to collaboratively detect the electrolyte temperature of the system.

[0052] The cooling seawater inlet pipeline 20 further includes a FIT1 seawater flowmeter 21, which is used to monitor the seawater flow rate; the cooling seawater outlet pipeline 5 further includes a seawater pump 13, which is used to provide power for the cooling seawater.

[0053] The ejector 12 is installed on the cooling seawater inlet pipeline 20. The ejector 12 is also connected to the vacuum pipeline 15 and the concentrated seawater extraction pipeline 16 in the seawater evaporation device. The ejector 12 is used to reduce the boiling temperature of water in the seawater evaporation device.

[0054] The outlet of the salinity meter probe 6 in the concentration analysis device is divided into an excessive fresh water outlet pipeline 4 and a qualified fresh water outlet pipeline 3 .

[0055] The water supply pipeline 8 is provided with a TV1 pneumatic diaphragm regulating valve 19 for adjusting the seawater replenishment flow rate.

[0056] The overflow pipe 14 is provided with a downward U-bend in the evaporation chamber 9 for extracting seawater with a higher salinity at the bottom of the evaporation chamber.

[0057] The control method of the waste heat recovery device for electrolyzing seawater to produce hydrogen under fluctuating conditions in this embodiment includes: obtaining the change in the working power of the electrolyzer according to the load operation of the electrolyzer, and then issuing a control instruction based on the change in the working power of the electrolyzer to control the seawater flow rate to increase or decrease, and controlling the water output of the waste heat recovery device to meet the needs of electrolysis in the electrolyzer.

[0058] Specifically, when the electrolytic cell is running at high load, the waste heat recovery device is controlled to produce more water to meet the electrolysis needs of the electrolytic cell;

[0059] When the electrolytic cell is running at low load, the waste heat recovery device is controlled to produce less water to balance the electrolysis requirements of the electrolytic cell.

[0060] When the working power of the electrolytic cell changes (when the load of the electrolytic cell fluctuates), the waste heat of the electrolyte changes accordingly. The change in waste heat in turn causes the temperature of the electrolyte entering the waste heat recovery device to change, that is, the TT1 temperature transmitter 17 changes, thereby affecting the latent heat required for evaporation. The seawater replenishment flow rate corresponding to the latent heat change also needs to change to meet the change in water consumption.

[0061] like Figure 2 As shown, the adjustment logic is as follows:

[0062] S1, change of electrolytic cell working power;

[0063] S2, change of waste heat from electrolyzer;

[0064] S3, the change in latent heat required for evaporation of seawater in the waste heat recovery device;

[0065] S4, the change in the amount of seawater required to cool;

[0066] S5, the seawater replenishment flow rate changes accordingly;

[0067] Among them, the hydrogen production of 1 standard cubic meter per hour corresponds to the water demand of 1L per hour;

[0068] Hydrogen production = chamber current × number of chambers / 2390.

[0069] Specifically, the following steps are included:

[0070] ① Changes in the working power of the electrolytic cell;

[0071] ② Changes in waste heat from electrolytic cells;

[0072] ③ Determination: whether the value of TT1 temperature transmitter 17 rises, if yes, increase the flow of seawater pump 13, reduce the opening of TV1 pneumatic diaphragm regulating valve 19, and increase the waste heat recovery water production; if no, reduce the flow of seawater pump 13, increase the opening of TV1 pneumatic diaphragm regulating valve 19, and reduce the waste heat recovery water production;

[0073] ④ Determination: whether the water production matches the change in electrolytic cell power. If so, maintain the seawater pump flow and the opening of the pneumatic diaphragm regulating valve, and match the waste heat recovery device with the electrolytic cell power; if not, return to step ③.

Claims

1. A waste heat recovery device for electrolyzing seawater to produce hydrogen under fluctuating conditions, characterized in that: The waste heat recovery device includes a seawater evaporation device, a cooling device and a concentration analysis device; The seawater evaporation device comprises an electrolyte inlet pipeline (1), an electrolyte outlet pipeline (2), an overflow pipeline (14), a concentrated seawater extraction pipeline (16), an ejector (12), an evaporation chamber (9), a water supply pipeline (8), a demister (11), and a vacuum pipeline (15); the electrolyte inlet pipeline (1) and the electrolyte outlet pipeline (2) provide a heat source for evaporation to the seawater evaporation device, the overflow pipeline (14) allows excess seawater to overflow out of the seawater evaporation device, the concentrated seawater extraction pipeline (16) extracts seawater with excessively high concentration in the seawater evaporation device, the ejector (12) lowers the boiling point of water, the evaporation chamber (9) evaporates part of the seawater into hot steam, the water supply pipeline (8) provides fresh seawater to the seawater evaporation device, the demister (11) is used to separate salt mist entering the condensation chamber (10) from the evaporation chamber (9), and the vacuum pipeline (15) is used to lower the boiling temperature of water in the seawater evaporation device; The cooling device comprises a cooling seawater inlet pipeline (20), a cooling seawater outlet pipeline (5), and the condensation chamber (10); the cooling seawater inlet pipeline (20) and the cooling seawater outlet pipeline (5) are used to provide cooling medium to the cooling device, and the condensation chamber (10) is used to provide a place for the cooling device; The concentration analysis device comprises a salinity probe (6) and a condensate pump (7). The salinity probe (6) is used by the concentration analysis device to analyze the salt content of condensate water, and the condensate pump (7) is used to draw out the condensate water required by the concentration analysis device.

2. The waste heat recovery device for electrolyzing seawater to produce hydrogen under fluctuating conditions according to claim 1 is characterized in that: The electrolyte inlet pipeline (1) further comprises a TT1 temperature transmitter (17), and the electrolyte outlet pipeline (2) further comprises a TT2 temperature transmitter (18). The TT1 temperature transmitter (17) and the TT2 temperature transmitter (18) are used to collaboratively detect the electrolyte temperature of the system.

3. The waste heat recovery device for electrolyzing seawater to produce hydrogen under fluctuating conditions according to claim 1 is characterized in that: The cooling seawater inlet pipeline (20) further comprises a FIT1 seawater flow meter (21), and the FIT1 seawater flow meter (21) is used to monitor the seawater flow rate; the cooling seawater outlet pipeline (5) further comprises a seawater pump (13), and the seawater pump (13) is used to provide power for the cooling seawater.

4. The waste heat recovery device for electrolyzing seawater to produce hydrogen under fluctuating conditions according to claim 1 is characterized in that: The ejector (12) is installed on the cooling seawater inlet pipeline (20), and the ejector (12) is also connected to the vacuum pipeline (15) and the concentrated seawater extraction pipeline (16) in the seawater evaporation device. The ejector (12) is used to reduce the boiling temperature of water in the seawater evaporation device.

5. The waste heat recovery device for electrolyzing seawater to produce hydrogen under fluctuating conditions according to claim 1 is characterized in that: The outlet of the salinity meter probe (6) in the concentration analysis device is divided into an excessive fresh water outlet pipeline (4) and a qualified fresh water outlet pipeline (3).

6. The waste heat recovery device for electrolyzing seawater to produce hydrogen under fluctuating conditions according to claim 1 is characterized in that: The water supply pipeline (8) is provided with a TV1 pneumatic diaphragm regulating valve (19) for regulating the flow rate of seawater replenishment.

7. The waste heat recovery device for electrolyzing seawater to produce hydrogen under fluctuating conditions according to claim 1 is characterized in that: The overflow pipeline (14) is provided with a downward U-bend in the evaporation chamber (9) for extracting seawater with a higher salinity at the bottom of the evaporation chamber.

8. A control method for a waste heat recovery device for electrolyzing seawater to produce hydrogen under fluctuating conditions, characterized in that: The control method includes: obtaining the change of the working power of the electrolytic cell according to the load operation of the electrolytic cell, and then issuing a control instruction through the change of the working power of the electrolytic cell to control the increase or decrease of the seawater flow rate, and controlling the water production of the waste heat recovery device to meet the needs of electrolysis in the electrolytic cell.

9. The control method according to claim 8, characterized in that: When the load of the electrolytic cell fluctuates, the waste heat of the electrolytic cell will also change accordingly. The change in waste heat will cause the temperature of the electrolyte entering the waste heat recovery device to change, thereby affecting the latent heat required for evaporation. The seawater replenishment flow rate corresponding to the latent heat change also needs to change to meet the change in water consumption.

10. The control method according to claim 9, characterized in that: When the electrolytic cell load fluctuates, the regulation logic of the waste heat recovery device is as follows: S1, change of electrolytic cell working power; S2, change of waste heat from electrolyzer; S3, the change in latent heat required for evaporation of seawater in the waste heat recovery device; S4, the change in the amount of seawater required to cool; S5, the seawater replenishment flow rate changes accordingly; Among them, the hydrogen production of 1 standard cubic meter per hour corresponds to the water demand of 1L per hour; Hydrogen production = chamber current × number of chambers / 2390.

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