Hydrogen production system and control method for a hydrogen production system

Abstract

The application provides a hydrogen production system and a control method thereof. The hydrogen production system comprises a conveying device, a raw water heating device, an evaporation device, an electrolysis device, a controller and an energy supply device. The conveying device comprises a conveying pipeline and a power equipment arranged on the conveying pipeline. A first end of the conveying pipeline is connected to a raw water source. The raw water heating device, the evaporation device and the electrolysis device are connected to the conveying device. A pure water tank is connected to the conveying device and located between the evaporation device and the electrolysis device. The energy supply device comprises a power generation device, an energy storage battery device and a direct current bus. The energy supply device further comprises a first power supply, a second power supply and a third power supply arranged on the direct current bus. The hydrogen production system can reduce the construction cost of the hydrogen production system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydrogen production, and particularly relates to a hydrogen production system and a control method of the hydrogen production system. BACKGROUND

[0002] Hydrogen production technology is a technology of using an energy supply device to supply energy, electrolyzing purified raw water to produce hydrogen and oxygen as products. At present, the device for supplying energy to the hydrogen production system generally uses clean energy, i.e. wind power generation device, solar photovoltaic power generation device and fuel cell device. The above devices have many advantages such as energy saving and environmental protection, short construction period, flexible investment, etc. as a new energy generation form. However, due to the intermittent, random and fluctuating characteristics of wind energy and solar energy, it is difficult for the wind power generation device and the solar photovoltaic power generation device to provide stable output power for the hydrogen production device. Although the fuel cell device can provide stable output power, the rate of changing power is slow, and in the case of changing the power consumption of the hydrogen production device, it is difficult for the fuel cell device to quickly change the output power to supply the power consumption demand of the hydrogen production device.

[0003] In order to solve the above problems, an energy storage battery device is generally added in the energy supply device. On the one hand, the energy storage battery device has the advantage of fast change of output power, and on the other hand, the energy storage battery device has the function of charging and discharging. When there is surplus power of the wind power generation device or the solar power generation device, the energy storage battery can be charged, and when the power of the wind power generation device or the solar power generation device is insufficient, the energy storage battery device can supplement the output power, so as to ensure that the entire energy supply device has stable output power.

[0004] However, due to the large fluctuation of the wind power generation device or the solar power generation device, multiple sets of energy storage battery devices need to be set as backup, resulting in high cost of the hydrogen production system. SUMMARY

[0005] The present application provides a hydrogen production system and a control method of the hydrogen production system, to solve the problem of high cost of the hydrogen production system in the related art.

[0006] In one aspect, the application provides a hydrogen production system, comprising a conveying device, a raw water heating device, an evaporation device, an electrolysis device, a controller, and a power supply device, the controller being configured to control the power-on state of the conveying device, the raw water heating device, the evaporation device, and the electrolysis device; the conveying device comprising a conveying pipeline and a power equipment arranged on the conveying pipeline, a first end of the conveying pipeline being connected to a raw water source; the raw water heating device, the evaporation device, and the electrolysis device being connected to the conveying device in sequence along the flow direction of the raw water in the conveying pipeline; a pure water tank being connected to the conveying device and located between the evaporation device and the electrolysis device; the power supply device comprising a power generation device, an energy storage battery device, and a direct current bus connected to the power generation device and the energy storage battery device, the power supply device further comprising a first power supply, a second power supply, and a third power supply arranged on the direct current bus; wherein the first power supply is connected to the raw water heating device and supplies power to the raw water heating device; the power equipment and the evaporation device are connected to the second power supply, and the second power supply supplies power to the power equipment and the evaporation device; and the third power supply is connected to the electrolysis device to supply power to the electrolysis device.

[0007] In some embodiments, the electrolysis device comprises an electrolysis tank, an oxygen buffer tank, and a hydrogen buffer tank, the oxygen buffer tank being connected to the positive electrode of the electrolysis tank, and the hydrogen buffer tank being connected to the negative electrode of the electrolysis tank.

[0008] The power generation device comprises:

[0009] The fuel cell device, a power output end of the fuel cell being connected to the direct current bus, an anode of the fuel cell device being connected to the hydrogen buffer tank, and a cathode of the fuel cell device being connected to the oxygen buffer tank.

[0010] The wind power generation device, a power output end of the wind power generation device being connected to the direct current bus, and the wind power generation device being connected to the energy storage battery device to charge the energy storage battery device.

[0011] In some embodiments, the first power supply is a passive power supply.

[0012] In some embodiments, the power equipment comprises a first feeding pump, a second feeding pump, a first compressor, a first heat exchanger, and a third feeding pump, wherein the first feeding pump is arranged upstream of the raw water heating device to send raw water into the raw water heating device; the second feeding pump is arranged between the raw water heating device and the evaporation device to send raw water from the raw water heating device to the evaporation device; an air inlet end of the first compressor is connected to a steam discharge end of the evaporation device, an air outlet end of the first compressor is connected to an air inlet end of the first heat exchanger, an air outlet end of the first heat exchanger is connected to the pure water tank, and the pure water tank is connected to the electrolysis device through the third feeding pump.

[0013] In another aspect, the application provides a control method of a hydrogen production system, the control method of the hydrogen production system being applied to the hydrogen production system described above, and the control method of the hydrogen production system comprising:

[0014] when the SOC value of the energy storage battery device is greater than the first energy storage preset value, starting the first power supply, the second power supply and the third power supply in the hydrogen production system;

[0015] when the pure water storage in the pure water tank is greater than the pure water storage preset value, increasing the operating power of the third power supply and monitoring the operating power of the second power supply;

[0016] when the operating power of the second power supply is greater than the first power preset value, starting the electrolysis device to prepare hydrogen by electrolyzing pure water through the electrolysis device.

[0017] In some embodiments, the control method of the hydrogen production system further comprises:

[0018] when the SOC value of the energy storage battery device is less than or equal to the first energy storage preset value, charging the energy storage battery device until the SOC value of the energy storage battery device is greater than the first energy storage preset value.

[0019] In some embodiments, after the step of increasing the operating power of the third power supply and monitoring the operating power of the second power supply when the pure water storage in the pure water tank is greater than the pure water storage preset value, the control method of the hydrogen production system further comprises:

[0020] when the operating power of the second power supply is less than or equal to the first power preset value, increasing the discharging power of the energy storage battery device to increase the operating power of the second power supply.

[0021] In some embodiments, after the step of increasing the discharging power of the energy storage battery device when the operating power of the second power supply is less than or equal to the first power preset value, the control method of the hydrogen production system further comprises:

[0022] when the SOC value of the energy storage battery device is less than or equal to the second energy storage preset value, charging the energy storage battery device until the SOC value of the energy storage battery device is greater than the first energy storage preset value.

[0023] In some embodiments, obtaining the pure water storage in the pure water tank, increasing the operating power of the third power supply and monitoring the operating power of the second power supply when the pure water storage in the pure water tank is greater than the pure water storage preset value, further comprises:

[0024] when the pure water storage in the pure water tank is less than or equal to the pure water storage preset value, reducing the operating power of the third power supply to increase the operating power of the first power supply.

[0025] In some embodiments, charging the energy storage battery device comprises:

[0026] obtaining the SOC value of the energy storage battery system;

[0027] When the SOC value of the energy storage battery system is less than the third preset energy storage value, obtain the power generation of the wind power generation device and the power consumption of the DC bus at this time.

[0028] When the power generation of the wind power generation device is greater than the power consumption of the DC bus, the wind power generation device charges the energy storage battery device. When the power generation of the wind power generation device is less than or equal to the power consumption of the DC bus, and the SOC value of the energy storage battery system is less than or equal to the fourth energy storage preset value, the operating power of the third power source is reduced.

[0029] The hydrogen production system provided in this application includes an energy supply end, an equipment end, and a controller. The energy supply end mainly includes an energy supply system comprising a power generation unit, an energy storage battery unit, and a DC bus connected to the power generation unit and the energy storage battery unit. The equipment end includes electrical equipment involved in hydrogen production, such as a conveying unit, a raw water heating unit, an evaporation unit, and an electrolysis unit. The controller is used to control the electrical status of the equipment end, such as the conveying unit, the raw water heating unit, the evaporation unit, and the electrolysis unit.

[0030] To facilitate control of the output power of the electrical equipment at the equipment end, this application introduces a first power supply, a second power supply, and a third power supply on the DC bus. The first power supply is connected to the raw water heating device and supplies power to it. The power equipment and the evaporation device are both connected to the second power supply, which supplies power to both. The third power supply is connected to the electrolysis device and supplies power to it. Through this configuration, the controller can control the power consumption of the electrical equipment at the equipment end by controlling the output power of the first, second, and third power supplies. When the power generation of the power supply equipment is insufficient, priority can be given to ensuring the output power of one power supply while reducing the output power of others. This ensures the normal operation of the hydrogen production system and effectively alleviates the power supply pressure at the power supply end. Consequently, the power supply system does not need to be equipped with an excessive number of energy storage battery devices, which helps reduce the construction cost of the hydrogen production system. Attached Figure Description

[0031] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0032] Figure 1 This is a schematic diagram of the structure of a hydrogen production system provided in an embodiment of this application;

[0033] Figure 2 A schematic flowchart illustrating the control method for a hydrogen production system provided in an embodiment of this application;

[0034] Figure 3 A flowchart illustrating the control strategy of a hydrogen production system provided in an embodiment of this application;

[0035] Figure 4 The control strategy flow chart for charging the energy storage battery device of the hydrogen production system provided in the embodiments of the present application;

[0036] Figure 5 The power generation power rate diagram of the wind power generation device provided in the embodiments of the present application;

[0037] Figure 6 The power generation power rate diagram of the energy storage battery device provided in the embodiments of the present application;

[0038] Figure 7 The output power diagram of the first power source provided in the embodiments of the present application;

[0039] Figure 8 The output power diagram of the second power source provided in the embodiments of the present application;

[0040] Figure 9 The output power diagram of the third power source provided in the embodiments of the present application.

[0041] Explanation of reference signs:

[0042] 10 - DC bus; 11 - wind power generation device; 12 - energy storage battery device; 13 - fuel cell device; 14 - wind power controller; 15 - energy storage battery controller; 16 - fuel cell controller; 17 - first power source; 18 - second power source; 19 - third power source;

[0043] 21 - water inlet; 22 - evaporation pipeline; 23 - blowdown pipe; 24 - raw material air pipeline; 27 - fuel cell anode pipeline; 26 - fuel cell cathode pipeline; 28 - positive product pipeline; 29 - oxygen pipeline; 210 - negative product pipeline; 211 - hydrogen pipeline;

[0044] 31 - first feeding pump; 32 - raw water heat exchanger; 33 - raw water heating device; 34 - second feeding pump; 35 - first heat exchanger; 36 - first compressor; 37 - third feeding pump; 38 - positive water-gas separator; 39 - negative water-gas separator; 310 - air compressor; 311 - air flow regulating valve; 312 - raw water filter; 313 - air-oxygen mixer; 314 - pure water heat exchanger; 315 - oxygen flow regulating valve;

[0045] 41 - heat storage water tank; 42 - evaporation device; 43 - hydrogen storage tank; 44 - oxygen buffer tank; 45 - air buffer tank; 46 - pure water tank;

[0046] 50 - electrolysis device;

[0047] 60 - product pipeline; 61 - discharge device; 63 - pure water delivery pipeline; 64 - oxygen discharge pipeline;

[0048] 70-controller;

[0049] 80-hydrogen production system.

[0050] The specific embodiments of the present application have been shown and described in the above-described drawings and the following detailed description. These drawings and detailed description are not intended to limit the scope of the present application in any way, but rather to explain the present application to one of ordinary skill in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0051] Embodiments of the present application are described in detail below with reference to the attached drawings, which show examples of embodiments of the present application. The same or similar components have the same or similar designations throughout the drawings and detailed description and have the same or similar functions. The embodiments described below are examples intended to explain the present application and are not intended to limit the scope of the present application.

[0052] In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the terms "center", "vertical", "longitudinal", "width", "upper", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0053] In addition, the terms "first", "second", etc. are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the present application, unless otherwise clearly specified and limited, the terms "mounting", "fastening", "connecting", "fixing", etc. should be interpreted broadly, for example, can be fixedly connected, can be detachably connected, or integrated; can be mechanically connected, or electrically connected or in communication with each other; can be directly connected, or indirectly connected through an intermediate medium; can be an internal connection of two elements or an interaction relationship between two elements, unless otherwise clearly specified and limited. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0054] In the present application, unless specifically and expressly defined otherwise, a first feature is "on" or "under" a second feature can mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature is "over", "above" and "on top of" the second feature can mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. The first feature is "under", "below" and "underneath" the second feature can mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0055] In the description of the specification, the description of the terms "optionally", "optional implementation" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0056] In the related art, the energy supply device of the hydrogen production system generally includes wind power generation device, solar photovoltaic power generation device, fuel cell power generation device and clean energy power generation device, and energy storage battery device.

[0057] However, due to the intermittent, random and fluctuating nature of wind and solar energy, it is difficult for wind power generation devices and solar photovoltaic power generation devices to provide stable output power to hydrogen production equipment. Although the fuel cell device can provide stable output power, the rate of changing power is slow, and in the case of changing the power consumption of the hydrogen production equipment, the fuel cell device is difficult to quickly change the output power to supply the power demand of the hydrogen production equipment.

[0058] In order to solve the above problems, generally, energy storage battery devices are added in the energy supply device. On the one hand, the energy storage battery device has the advantage of fast change of output power, and on the other hand, the energy storage battery device has the function of charging and discharging. When the power of the wind power generation device or the solar power generation device is surplus, the energy storage battery can be charged, and when the power of the wind power generation device or the solar power generation device is insufficient, the energy storage battery device can supplement the output power, so as to ensure that the entire energy supply device has stable output power. However, due to the large fluctuation of the wind power generation device or the solar power generation device, multiple sets of energy storage battery devices need to be set as backup, resulting in high cost of the hydrogen production system.

[0059] In order to further solve the above problems, the inventors have found through long-term research that the power consumption of the hydrogen production equipment can be reduced by precisely adjusting the power of the hydrogen production equipment, thereby reducing the number of energy storage battery devices, and ultimately reducing the construction cost of the hydrogen production system.

[0060] Figure 1 A structural schematic diagram of a hydrogen production system provided by the embodiment of the present application is provided. Figure 5 A power generation power schematic diagram of a wind power generation device provided by the embodiment of the present application is provided. Figure 6 A power generation power schematic diagram of an energy storage battery device provided by the embodiment of the present application is provided. Figure 7 A schematic diagram of the output power of a first power supply provided by the embodiment of the present application is provided. Figure 8 A schematic diagram of the output power of a second power supply provided by the embodiment of the present application is provided. Figure 9 A schematic diagram of the output power of a third power supply provided by the embodiment of the present application is provided.

[0061] Specifically, as shown in Figure 1 and Figures 5 to 9 The embodiment provides a hydrogen production system, which comprises a conveying device, a raw water heating device, an evaporation device, an electrolysis device, a controller and an energy supply device.

[0062] The controller is used to control the power consumption states of the conveying device, the raw water heating device, the evaporation device and the electrolysis device. The conveying device comprises a conveying pipeline and a power equipment arranged on the conveying pipeline, and the first end of the conveying pipeline is communicated with a raw water source. The raw water heating device, the evaporation device and the electrolysis device are respectively communicated with the conveying device and are arranged in sequence along the flow direction of the raw water in the conveying pipeline. A pure water tank is communicated with the conveying device and is located between the evaporation device and the electrolysis device. The energy supply device comprises a power generation device, an energy storage battery device and a direct current bus connected with the power generation device and the energy storage battery device. The energy supply device further comprises a first power supply, a second power supply and a third power supply arranged on the direct current bus. The first power supply is connected with the raw water heating device and supplies energy for the raw water heating device. The power equipment and the evaporation device are connected with the second power supply, and the second power supply is used to supply energy for the power equipment and the evaporation device. The third power supply is connected with the electrolysis device to supply energy for the electrolysis device.

[0063] The technical scheme of the embodiment is applied to the hydrogen production system, which comprises an energy supply end, a device end and a controller. The energy supply end mainly comprises an energy supply system, which comprises a power generation device, an energy storage battery device and a direct current bus connected with the power generation device and the energy storage battery device. The device end comprises a conveying device, a raw water heating device, an evaporation device, an electrolysis device and other power consumption devices participating in hydrogen production. The controller is used to control the power consumption states of the conveying device, the raw water heating device, the evaporation device and the electrolysis device and other device ends.

[0064] In order to facilitate the control of the output power of the power equipment at the equipment end, the first power supply, the second power supply and the third power supply are introduced on the DC bus, wherein the first power supply is connected with the raw water heating device and supplies power to the raw water heating device; the power equipment and the evaporation device are connected with the second power supply, and the second power supply is used to supply power to the power equipment and the evaporation device; the third power supply is connected with the electrolysis device to supply power to the electrolysis device. Through the above setting mode, the controller can control the output power of the first power supply, the second power supply and the third power supply to control the power consumption of the power equipment at the equipment end. When the power generation of the power supply equipment is insufficient, the output power of a certain power supply can be preferentially guaranteed, and the output power of other power supplies can be reduced, so as to ensure the normal work of the hydrogen production system on the one hand, and effectively alleviate the power supply pressure of the power supply end, so that the power supply system does not need to set too many energy storage battery devices, which is beneficial to reduce the construction cost of the hydrogen production system.

[0065] Specifically, as shown in the figure, Figure 1 in the embodiment, the first power supply is connected with the raw water heating device and supplies power to the raw water heating device; the power equipment and the evaporation device are connected with the second power supply, and the second power supply is used to supply power to the power equipment and the evaporation device; the third power supply is connected with the electrolysis device to supply power to the electrolysis device.

[0066] Among them, the raw water heating device is used to heat the raw water, and the heated raw water enters the evaporator to evaporate. The evaporated water vapor condenses to form pure water, which can enter the electrolysis device to be electrolyzed, thereby producing hydrogen and oxygen as the product of the hydrogen production system.

[0067] In the embodiment, as shown in the figure, Figures 5 to 9 the power supply system is used to preferentially guarantee the power output of the second power supply, that is, to effectively guarantee the power consumption of the power equipment and the evaporation device, so that the raw water can be smoothly prepared into pure water. After the storage of pure water is guaranteed, if the power supply system can provide the remaining power, the output power of the third power supply can be increased, thereby improving the electrolysis efficiency of the electrolysis device and increasing the production efficiency of hydrogen and oxygen. When the power generation of the power supply device is insufficient, the output power of the third power supply, that is, the output power of the electrolysis device, can be reduced, thereby effectively reducing the power consumption of the equipment end and effectively alleviating the power supply pressure of the power supply end.

[0068] As shown in the figure, Figures 5 to 9 the consumption power of the third power supply accounts for 50-95% in the system, preferably 85%. The consumption power of the second power supply accounts for 2-10% in the system, preferably 3-5%. Therefore, it can be known that the electrolysis device 50 connected with the third power supply is the most energy-consuming device in the entire equipment end, and the output power of the third power supply can be adjusted to effectively change the power consumption of the equipment end.

[0069] The energy storage battery device includes, but is not limited to, a nickel-hydrogen battery, a lithium-ion battery, an advanced lead-acid battery, a lead-carbon battery, etc., and a super capacitor or other power device can also be selected. Preferably, the nickel-hydrogen battery and the lithium titanate battery.

[0070] As shown in Figure 1 In this embodiment, the electrolysis device includes an electrolytic tank, an oxygen buffer tank, and a hydrogen buffer tank. The oxygen buffer tank is in communication with the positive electrode of the electrolytic tank, and the hydrogen buffer tank is in communication with the negative electrode of the electrolytic tank. The electrolytic tank can electrolyze pure water. The electrolytic tank includes a positive electrode and a negative electrode. The positive electrode can generate oxygen, and the negative electrode can generate hydrogen. The positive electrode of the electrolytic tank is connected to the oxygen buffer tank, and the negative electrode is connected to the hydrogen buffer tank, thereby storing the hydrogen and oxygen generated by the electrolysis device.

[0071] As shown in Figure 1 In this embodiment, the power generation device includes a fuel cell device and a wind power generation device.

[0072] The fuel cell device generates relatively stable power, but it is relatively slow to change the power generation. When the power demand of the equipment end increases rapidly, it is difficult to increase the power generation to quickly respond to the power demand of the equipment end. The power output end of the wind power generation device is connected to the DC bus to provide power generation for the equipment end. At the same time, the wind power generation device is also connected to the energy storage battery device to charge the energy storage battery device when there is excess power. Because the wind power generation device is greatly affected by external wind, it has the characteristics of intermittency, randomness, and volatility, so the power generation is unstable. On the one hand, the energy storage battery device has the advantage of fast change of output power, and on the other hand, the energy storage battery device has the function of charging and discharging power supply. When the wind power generation device or the solar power generation device has excess power, it can also charge the energy storage battery. When the wind power generation device or the solar power generation device has insufficient power, the energy storage battery device can also supplement the output power, thereby ensuring that the entire power supply device has stable output power.

[0073] In this embodiment, the energy supply system uses a fuel cell device and a wind power generation device as a power generation device, and uses an energy storage battery device as a buffer device, so that the energy supply end of the hydrogen production system has the advantage of quickly responding to the power change of the equipment end, and also can provide stable output power for the equipment end.

[0074] Specifically, as shown in Figure 1 The wind power generation device 11 is connected to the DC bus 10 through a wind power controller 14. The energy storage battery device 12 is connected to the DC bus 10 through an energy storage battery controller 15; and the fuel cell device 13 is connected to the DC bus 10 through a fuel cell controller 16.

[0075] The anode of the fuel cell device is in communication with a hydrogen buffer tank, and the cathode of the fuel cell device is in communication with an oxygen buffer tank. The fuel cell consumes hydrogen and oxygen to generate electricity, and the hydrogen and oxygen are obtained by electrolysis of raw water by the hydrogen production device. Therefore, the energy source of the hydrogen production system of the embodiment can be self-produced, which greatly reduces the energy consumption of the hydrogen production system.

[0076] It should be further noted that the energy source relied on by the hydrogen production system to produce hydrogen and oxygen includes raw water and wind energy. Therefore, the hydrogen production system is suitable for installation in sea areas, coastal areas or islands, and fully utilizes the advantages of abundant raw water and wind power in the marine environment.

[0077] As shown in Figure 1 , in the embodiment, the first power supply is a passive power supply. The above-mentioned "passive power supply" refers to a power supply whose output power cannot be actively adjusted. Corresponding to it is an "active power supply", which is a power supply whose output power can be actively adjusted.

[0078] In the embodiment, the second power supply and the third power supply are active power supplies, and the first power supply is a passive power supply. The first power supply passively receives the power generation power remaining after the power consumption power of the second power supply and the third power supply is removed from the energy supply system, and the first power supply is used to power the raw water heating device.

[0079] Specifically, as shown in Figure 1 , in the embodiment, the power device includes a first feeding pump, a second feeding pump, a first compressor, a first heat exchanger, and a third feeding pump.

[0080] Among them, the first feeding pump is arranged upstream of the raw water heating device and is used to send raw water into the raw water heating device; the second feeding pump is arranged between the raw water heating device and the evaporation device, and is used to send raw water from the raw water heating device to the evaporation device; the gas inlet end of the first compressor is in communication with the steam discharge end of the evaporation device, the gas outlet end of the first compressor is in communication with the gas inlet end of the first heat exchanger, the gas outlet end of the first heat exchanger is in communication with the pure water tank, and the pure water tank is in communication with the electrolysis device 50 through the third feeding pump 37.

[0081] Specifically, as shown in Figure 1 , in the embodiment, the working process of the hydrogen production system is as follows:

[0082] Raw water enters the first feeding pump 31 from the water inlet 21, is filtered by the raw water filter 312, enters the raw water heat exchanger 32, and then passes through the pure water heat exchanger 314, so that the temperature is raised from T1 to T2. Then, after passing through the raw water heating device 33, the temperature is raised from T2 to T3. The T3 temperature is 60-100℃.

[0083] The raw water is heated and stored in the heat storage tank 41. The hot water is pumped out of the heat storage tank 41 by the second feed pump 34, and enters the first heat exchanger 35 to be heated, so that the temperature is raised from T3 to T4, and T4 is in the range of 70-100°C. The water enters the evaporation device 42, and the generated steam enters the first compressor 36 through the evaporation pipeline 22, and the temperature of the steam is raised from T4 to T5, and T5 is in the range of 70-105°C. The hot steam passes through the first heat exchanger 35, and is condensed to T6 to become liquid pure water. The liquid pure water is stored in the pure water tank 46. The liquid water in the evaporation device 42 enters the raw water heat exchanger 32, and the temperature is lowered from T4 to T7, and is discharged through the discharge pipeline 23 after necessary treatment (mainly natural cooling) in the discharge device 61. The liquid pure water enters the electrolysis device 50 through the third feed pump 37, and an electrolysis reaction (as shown in formula 1) occurs. The electrolysis device 50 includes an electrolytic cell, and the electrolytic cell is preferably a proton exchange membrane electrolytic cell (PEMEC).

[0084] Formula 1:

[0085] Positive electrode:

[0086] Negative electrode: 2H + +2e - =H2

[0087] Overall reaction:

[0088] After the electrolysis of the pure water, the oxygen-water mixture produced by the positive electrode enters the positive electrode steam-water separator 38 through the positive electrode product pipeline 28, and is separated. The oxygen enters the oxygen buffer tank 44 through the oxygen pipeline 29. The hydrogen-water mixture produced by the negative electrode enters the negative electrode steam-water separator 39 through the negative electrode product pipeline 210, and is separated. The hydrogen is stored in the hydrogen storage tank 43 through the hydrogen pipeline 211. The pure water separated by the positive electrode steam-water separator 38 and the negative electrode steam-water separator 39 is further heated due to the heat effect of the electrolytic cell, and the temperature is raised to T8, and T8 is in the range of 80-95°C. The separated pure water is returned to the pure water heat exchanger 314, and the temperature is lowered to T6 or close to T6, and is recovered into the pure water tank 46.

[0089] The product hydrogen in the hydrogen storage tank 43 is supplied to the user through the product pipeline 60. A small part of the product hydrogen is supplied to the fuel cell device 13 through the fuel cell anode pipeline 27. The raw material air is supplied to the air buffer tank 45 through the raw material air pipeline 24 and the air compressor 310. The air in the air buffer tank 45 and the oxygen in the oxygen buffer tank 44 are mixed in the air-oxygen mixer 313 after being adjusted in a certain proportion through the air flow adjusting valve 311 and the oxygen flow adjusting valve 315. The oxygen content of the mixed gas can be adjusted between 21-100%. The mixed oxygen-rich system enters the fuel cell device 13 through the fuel cell cathode pipeline 26. The hydrogen and the oxygen-rich gas react in the fuel cell device 13 (as shown in formula 2).

[0090] Formula 2:

[0091] Anode: H2 = 2H + + 2e -

[0092] Cathode:

[0093] Overall reaction:

[0094] The excess oxygen in the oxygen buffer tank 44 can be delivered to the customer through the oxygen discharge pipeline 64 or directly discharged. In addition, the pure water stored in the pure water tank 46 can be supplied to the user through the pure water delivery pipeline 63. The water used in the fuel cell device 13 is also provided by the pure water tank 46 (not shown in the figure).

[0095] It should be noted that the preferred temperature range is different according to the source of the raw water, and the corresponding pressure in the evaporator is also different.

[0096] As shown in Figure 2 , the application provides another control method of the hydrogen production system.

[0097] Figure 2 The flow chart of the control method of the hydrogen production system provided in the embodiment of the application is shown in Figure 3 The control strategy flow chart of the hydrogen production system provided in the embodiment of the application is shown in

[0098] As shown in Figure 2 and Figure 3 , in the embodiment, the control method of the hydrogen production system is applied to the hydrogen production system described above, and the control method of the hydrogen production system comprises the following steps.

[0099] Step S100: When the SOC value of the energy storage battery device in the hydrogen production system is greater than a first energy storage preset value, the first power supply, the second power supply and the third power supply in the hydrogen production system are started.

[0100] Step S200: When the pure water storage in the pure water tank is greater than the pure water storage preset value, the operating power of the third power supply is increased, and the operating power of the second power supply is monitored;

[0101] Step S310: When the operating power of the second power supply is greater than the first power preset value, the electrolysis device is started to prepare hydrogen by electrolyzing the pure water.

[0102] The "SOC" above refers to the English abbreviation of State of Charge, indicating the available state of the remaining charge in the battery, usually expressed in percentage.

[0103] In the embodiment, the energy supply system includes a wind power generation device, a fuel cell power generation device, and an energy storage battery device. The power generation output ends of the wind power generation device and the fuel cell power generation device are connected with the DC bus, and the generated power can directly power the equipment end. The fuel cell power generation device can supply power to the equipment end with stable power generation, and the wind power generation device can directly supply power to the equipment end through the DC bus, and can charge the energy storage battery device when there is surplus power. When the power generation of the wind power generation device is insufficient to support the power consumption of the equipment end, the energy storage battery device can supply power to the equipment end to maintain the normal operation of the hydrogen production system. Therefore, the SOC value of the energy storage battery device can reflect whether the power of the entire energy supply system is sufficient. In step S100, first determine whether the SOC value of the energy storage battery device is greater than the first energy storage preset value. If the SOC value of the energy storage battery device is greater than the first energy storage preset value, it indicates that the energy supply system has sufficient power at this time, and the first power supply, the second power supply and the third power supply in the hydrogen production system can be started to enable the electrical equipment of the hydrogen production system to operate normally. After the equipment is running, the pure water storage in the pure water tank is determined. When the pure water storage in the pure water tank is greater than the pure water storage preset value, the operating power of the third power supply is increased to increase the power of the electrolysis device and accelerate the rate of manufacturing hydrogen and oxygen. In addition, while increasing the operating power of the third power supply, the operating power of the second power supply is also monitored to prevent the operating power of the third power supply from being too high to affect the operating power of the second power supply, thereby ensuring that the equipment powered by the second power supply can operate normally. When the operating power of the second power supply is lower than the first power preset value, the discharge power of the energy storage battery system is further increased to support the operation of the second power supply. At the same time, the SOC value of the energy storage battery system is monitored. If the SOC value of the energy storage battery system at this time is less than the second energy storage preset value, it indicates that the energy supply capacity of the energy supply device at this time is insufficient, and the energy of the energy storage battery device should be increased in time until the first determination criterion of the energy storage battery 1, and the electrolysis power of the electrolysis device is adjusted by the power supply capacity of the power supply system and the pure water storage as the determination criterion, thereby realizing precise control of the power supply equipment of the hydrogen production system.

[0104] Specifically, the first energy storage preset value is set in a range of 50% to 100%, preferably 50% to 100%; the second energy storage preset value is set in a range of 0% to 50%, preferably 30% to 50%; the first power preset value is set in a range of 30% to 100% of the rated power of the second power supply, preferably 75% to 100%; and the water quantity preset value is the water quantity used in 0.1 to 1 hours when the third power supply is running at 50% to 100% power (or current), or the water quantity used in 0.5 hours when the third power supply is running at 100% power (or current).

[0105] Further, the step S100 comprises: charging the energy storage battery device when the SOC value of the energy storage battery device is less than or equal to the first energy storage preset value, until the SOC value of the energy storage battery device is greater than the first energy storage preset value. The SOC value of the energy storage battery device can reflect the power supply capacity of the power supply system. Only when the SOC value of the energy storage battery device is greater than the first energy storage preset value, the first power supply, the second power supply and the third power supply can be started, that is, the hydrogen production system can run normally. When the SOC value of the energy storage battery device is less than or equal to the first energy storage preset value, it indicates that the power supply capacity of the current power supply system is insufficient to support the power supply of the equipment end, so the first power supply, the second power supply and the third power supply cannot be started until the electric quantity of the energy storage battery device is increased to above the first energy storage preset value.

[0106] Further, after the step S200, the control method of the hydrogen production system further comprises:

[0107] The step S320: when the running power of the second power supply is less than or equal to the first power preset value, the discharging power of the energy storage battery device is increased to increase the running power of the second power supply. The above step can ensure the running power of the second power supply, and the running power of the third power supply can be reduced to ensure the running power of the second power supply, that is, the power supply of the second power supply is preferentially ensured, so that the equipment powered by the second power supply can run normally.

[0108] Specifically, the second power supply is used to power the power equipment and the evaporation device; and the third power supply is connected with the electrolysis device to power the electrolysis device. In this embodiment, the power supply system is used to preferentially ensure the power output of the second power supply, that is, the power consumption of the power equipment and the evaporation device is ensured, so that the raw water can be smoothly prepared into pure water, and the storage of the pure water is ensured. If the power supply system can provide the remaining power, the output power of the third power supply can be increased, so as to increase the electrolysis efficiency of the electrolysis device and the production efficiency of hydrogen and oxygen. When the power generation of the power supply device is insufficient, the output power of the third power supply, that is, the output power of the electrolysis device, can be reduced, and then the power consumption of the equipment end is reduced, so as to effectively relieve the power supply pressure of the power supply end.

[0109] Further, as shown in Figure 2 After step S320, step S400 further includes:

[0110] When the SOC value of the energy storage battery device is less than or equal to the second energy storage preset value, the energy storage battery device is charged until the SOC value of the energy storage battery device is greater than the first energy storage preset value. The above-mentioned step can ensure the SOC value of the energy storage battery device, so that the energy storage battery device is not in a state of being exhausted, thereby effectively ensuring the service life of the energy storage battery device.

[0111] It should be noted that the smaller the difference between the first energy storage preset value and the second energy storage preset value, the more conducive to ensuring the service life of the energy storage battery. However, if the difference between the first energy storage preset value and the second energy storage preset value is too small, it will affect the power supply capacity of the energy storage battery device. The more the number of single batteries in the energy storage battery device, the smaller the power consumption shared by each single battery, but the cost will correspondingly increase, so the installation cost and service life of the energy storage battery device need to be considered comprehensively to set the number of energy storage battery devices and the specific values of the first energy storage preset value and the second energy storage preset value.

[0112] Further, as shown in Figure 2 Step S200 further includes:

[0113] When the pure water storage in the pure water tank is less than or equal to the pure water storage preset value, the operating power of the third power supply is reduced to increase the operating power of the first power supply. In the above-mentioned step, the first power supply is a passive power supply, which can reduce the efficiency of electrolytic water in the case of less water in the pure water tank, on the one hand, reducing the consumption of pure water, on the other hand, the first power supply is a passive power supply, which can reduce the operating power of the third power supply to increase the operating power of the first power supply in the case of stable operation of the second power supply, so that the pure water can be quickly accumulated.

[0114] Figure 4 The control strategy flowchart for charging the energy storage battery device of the hydrogen production system provided by the embodiment of the present application.

[0115] As shown in Figure 4 In step S100, the step of charging the energy storage battery device includes:

[0116] Obtaining the SOC value of the energy storage battery system;

[0117] When the SOC value of the energy storage battery system is less than the third energy storage preset value, obtaining the power generation power of the wind power generation device and the power consumption power of the DC bus at this time;

[0118] When the power generated by the wind power generation device is greater than the power consumed by the DC bus, the wind power generation device charges the energy storage battery device; when the power generated by the wind power generation device is less than or equal to the power consumed by the DC bus, and the SOC value of the energy storage battery system at this time is less than or equal to the fourth energy storage preset value, the operating power of the third power supply is reduced.

[0119] In the above steps, the power consumed by the entire device end can be reduced by reducing the output power of the third power supply, so that the power of the energy storage battery device can be accumulated rapidly to avoid overconsumption of the energy storage battery device.

[0120] Specifically, the third energy storage preset value is set in a range of 100% to 90%, and in this embodiment, the third energy storage preset value is 100%, that is, as long as the energy storage battery device is not full of power, the wind power generation device can charge the energy storage battery device with the remaining power. In fact, the energy storage battery device is always in a state of consumption and charging. The fourth energy storage preset value is set in a range of 30% to 90%, and preferably, the fourth energy storage preset value is between 60% and 80%. That is, when the power of the energy storage battery device is consumed to 45%, the energy storage battery device is in a low power state, and at this time, the output power of the third power supply should be reduced to rapidly increase the power of the energy storage battery device.

[0121] It should be noted that during the process of reducing the SOC value of the energy storage battery device from the third energy storage preset value to the fourth energy storage preset value, a gradient power consumption prompting step can be added, that is, the energy storage battery device sends a current SOC value signal to the controller every time a certain SOC value is consumed, and the controller can be connected to a power display device to display the current SOC value of the energy storage battery device.

[0122] In this embodiment, the energy relationship between the functional system and the device end is as follows:

[0123] P wind +P battery +P FC =P e +P bop +P hot +P loss

[0124] P wind is the output power of the wind power generation device 11, P battery is the output or input power of the energy storage battery device 12, P FC is the output power of the fuel cell device 13, P e is the output power of the third power supply 19, P bop is the output power of the second power supply 18, P hot is the output power of the first power supply 17, and P lossTo system loss power.

[0125] Finally, it should be noted that the above embodiments are only intended to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A hydrogen production system, characterized in that, It includes a conveying device, a raw water heating device, an evaporation device, an electrolysis device, a controller, and a power supply device. The controller is used to control the power consumption status of the conveying device, the raw water heating device, the evaporation device, and the electrolysis device. The conveying device includes a conveying pipeline and a power device installed on the conveying pipeline, with the first end of the conveying pipeline connected to the raw water source; The raw water heating device, the evaporation device, and the electrolysis device are respectively connected to the conveying device and are arranged sequentially along the flow direction of the raw water in the conveying pipeline; A pure water tank, which is connected to a conveying device and located between the evaporation device and the electrolysis device; The power supply device includes a power generation device, an energy storage battery device, and a DC bus connected to the power generation device and the energy storage battery device. The power supply device also includes a first power source, a second power source, and a third power source installed on the DC bus. The first power source is connected to the raw water heating device and supplies power to the raw water heating device; the power equipment and the evaporation device are both connected to the second power source, which supplies power to the power equipment and the evaporation device; the third power source is connected to the electrolysis device to supply power to the electrolysis device. When the SOC value of the energy storage battery device in the hydrogen production system is greater than the first energy storage preset value, the first power supply, the second power supply and the third power supply in the hydrogen production system are turned on. When the pure water storage in the pure water tank is greater than the preset value, the operating power of the third power supply is increased, and the operating power of the second power supply is monitored. When the operating power of the second power source is greater than the preset first power value, the electrolysis device is started to produce hydrogen by electrolyzing pure water through the electrolysis device.

2. The hydrogen production system according to claim 1, characterized in that, Also includes: When the SOC value of the energy storage battery device is less than or equal to the first preset energy storage value, the energy storage battery device is charged until the SOC value of the energy storage battery device is greater than the first preset energy storage value.

3. The hydrogen production system according to claim 1, characterized in that, After the steps of increasing the operating power of the third power source and monitoring the operating power of the second power source when the pure water storage in the pure water tank exceeds a preset value, the control method of the hydrogen production system further includes: When the operating power of the second power source is less than or equal to the first power preset value, the discharge power of the energy storage battery device is increased to increase the operating power of the second power source.

4. The hydrogen production system according to claim 3, characterized in that, When the operating power of the second power source is less than or equal to the first preset power value, after increasing the discharge power of the energy storage battery device, the control method of the hydrogen production system further includes: When the SOC value of the energy storage battery device is less than or equal to the second preset energy storage value, the energy storage battery device is charged until the SOC value of the energy storage battery device is greater than the first preset energy storage value.

5. The hydrogen production system according to claim 1, characterized in that, The method includes obtaining the pure water storage capacity in the pure water tank; when the pure water storage capacity in the pure water tank exceeds a set value, increasing the operating power of the third power supply and monitoring the operating power of the second power supply; and further includes: When the amount of pure water stored in the pure water tank is less than or equal to the preset value of pure water storage, the operating power of the third power supply is reduced to increase the operating power of the first power supply.

6. The hydrogen production system according to claim 2, characterized in that, Charging the energy storage battery device includes: Obtain the SOC value of the energy storage battery system; When the SOC value of the energy storage battery system is less than the third preset energy storage value, the power generation of the wind power generation device and the power consumption of the DC bus are obtained at this time. When the power generation of the wind power generation device is greater than the power consumption of the DC bus, the wind power generation device charges the energy storage battery device. When the power generation of the wind power generation device is less than or equal to the power consumption of the DC bus, and the SOC value of the energy storage battery system is less than or equal to the fourth energy storage preset value, the operating power of the third power source is reduced.

7. The hydrogen production system according to claim 1, characterized in that, The electrolysis device includes an electrolytic cell, an oxygen buffer tank, and a hydrogen buffer tank. The oxygen buffer tank is connected to the positive electrode of the electrolytic cell, and the hydrogen buffer tank is connected to the negative electrode of the electrolytic cell. The power generation device includes: A fuel cell device, wherein the power output terminal of the fuel cell is connected to the DC bus, the anode of the fuel cell device is connected to the hydrogen buffer tank, and the cathode of the fuel cell device is connected to the oxygen buffer tank; A wind power generation device, wherein the power output terminal of the wind power generation device is connected to the DC bus, and the wind power generation device is connected to the energy storage battery device to charge the energy storage battery device.

8. The hydrogen production system according to claim 1, characterized in that, The first power source is a passive power source.

9. The hydrogen production system according to any one of claims 1 to 8, characterized in that, The power equipment includes: a first feed pump, a second feed pump, a first compressor, a first heat exchanger, and a third feed pump. The first feed pump is located upstream of the raw water heating device to feed raw water into the raw water heating device. The second feed pump is located between the raw water heating device and the evaporation device to feed raw water from the raw water heating device to the evaporation device. The inlet of the first compressor is connected to the steam outlet of the evaporation device, the outlet of the first compressor is connected to the inlet of the first heat exchanger, the outlet of the first heat exchanger is connected to the pure water tank, and the pure water tank is connected to the electrolysis device via the third feed pump.

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