A solid oxide electrolysis cell-magnesium-based solid hydrogen storage device and a hydrogen charging control method thereof

Abstract

The present application relates to a kind of solid oxide electrolytic cell-magnesium-based solid hydrogen storage device system and its hydrogen filling control method, the system includes solid oxide electrolytic cell (1), magnesium-based solid hydrogen storage device (12), hydrogen filling control system (14), and logic control system based on fuzzy logic controls hydrogen filling process.The present application proposes a kind of solid oxide electrolytic cell-magnesium-based solid hydrogen storage device system, and utilizes fuzzy intelligent control technology to adjust heat exchange medium flow, on-line controls hydrogen absorption temperature, realizes the rapid transfer of hydrogen absorption process heat, improves the electrolytic efficiency of solid oxide electrolytic cell, with high electrolytic efficiency, high volume hydrogen storage density, and the advantages such as convenient operation method.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of hydrogen storage devices, and particularly relates to a solid oxide electrolysis cell-magnesium-based solid-state hydrogen storage device and a hydrogen charging control method thereof. BACKGROUND

[0002] Solid oxide electrolysis cell (SOEC) is a high-temperature electrolysis technology, which decomposes water vapor (H2O) into hydrogen (H2) and oxygen (O2) at a high temperature environment (600-1000℃). The electrolysis efficiency can reach 90%-100%, which is much higher than that of alkaline electrolysis water hydrogen production and proton exchange membrane electrolysis hydrogen production. Due to the advantages of high efficiency, sustainability, flexibility and the like, the solid oxide electrolysis hydrogen production technology is expected to play an important role in the future clean energy field and make contributions to the realization of hydrogen energy economy and the mitigation of climate change.

[0003] The current mainstream hydrogen storage technologies include high-pressure gaseous hydrogen storage and liquid hydrogen storage. However, the high-pressure gaseous hydrogen storage technology and the liquid hydrogen storage technology have technical bottlenecks such as high energy consumption, low volume hydrogen storage density, and high safety risk of hydrogen storage and transportation. The magnesium-based solid-state hydrogen storage technology realizes normal-temperature and low-pressure hydrogen storage and transportation, and has the advantages of high safety and low energy consumption, and is expected to become one of the key technologies for large-scale and long-period hydrogen energy storage in the future. However, the magnesium-based solid-state hydrogen storage technology has large energy consumption in the hydrogen absorption and release process. The hydrogen absorption process is carried out at about 300℃, and the activation energy of the hydrogen absorption process is 75kJ / mol H2, which is accompanied by a large amount of energy loss.

[0004] If the solid oxide electrolysis hydrogen production technology and the magnesium-based solid-state hydrogen storage technology are combined, the heat energy released in the hydrogen absorption process of the magnesium-based solid-state hydrogen storage system can be used to evaporate the water supply of the solid oxide electrolysis cell, which can greatly improve the electrolysis efficiency. At the same time, based on the intelligent control system, the heat energy of the hydrogen storage system is promptly discharged, which promotes the safety and rapid hydrogen charging of the hydrogen storage system.

[0005] Therefore, the technical personnel in the field are committed to developing an efficient and reliable solid oxide electrolysis cell-magnesium-based solid-state hydrogen storage device and a hydrogen charging control method thereof, which can improve the electrolysis efficiency of the solid oxide electrolysis cell through heat integration technology while efficiently charging hydrogen. SUMMARY

[0006] To achieve the above-mentioned purpose, in a first aspect, the application provides a solid oxide electrolysis cell-magnesium-based solid-state hydrogen storage device, which comprises a solid oxide electrolysis cell (1), a magnesium-based solid-state hydrogen storage device (12), and a hydrogen charging control system (14).

[0007] The magnesium-based solid-state hydrogen storage device (12) is composed of at least one magnesium-based solid-state storage tank (17) having a hydrogen inlet (18), a heat conducting oil inlet (25), a heat conducting oil outlet (19), a magnesium-based solid-state hydrogen storage material (21), a thermometer 1 (27) for measuring the internal temperature of the magnesium-based solid-state storage tank (17), and a thermometer 2 (26) for measuring the heat conducting oil outlet temperature of the magnesium-based solid-state storage tank (17);

[0008] The solid oxide electrolyzer (1) and the magnesium-based solid-state hydrogen storage device (12) are connected by an evaporator (2), a condenser (3), a dryer (4), and a hydrogen compressor (9) through a hydrogen / hydrogen-rich gas flow pipeline, wherein the hydrogen inlet (18) of the magnesium-based solid-state storage tank (17) is connected to the hydrogen compressor (9) through a first three-way valve (10);

[0009] The heat conducting oil outlet (19) of the magnesium-based solid-state storage tank (17) is connected to a mixer (11), a heat exchanger (7), a heat conducting oil storage tank (5), a heat conducting oil pump (6), and the heat conducting oil inlet (25) of the magnesium-based solid-state storage tank (17) in sequence through a heat conducting oil flow pipeline, wherein the heat conducting oil inlet (25) of the magnesium-based solid-state storage tank (17) is connected to the heat conducting oil pump (6) through a second three-way valve (13);

[0010] The heat exchanger (7) is also connected to a feed water pump (15), the evaporator (2), and the solid oxide electrolyzer (1) through a water / water vapor pipeline, respectively;

[0011] The hydrogen charging control system (14) real-time corrects the valve opening degree of the first three-way valve (10) according to the value of the thermometer 1 (27) to maintain the average internal temperature of the magnesium-based solid-state storage tank (17); and the hydrogen charging control system (14) real-time corrects the valve opening degree of the second three-way valve (13) according to the value of the thermometer 2 (26) to maintain the temperature of the heat conducting oil outlet (19) of the magnesium-based solid-state storage tank (17).

[0012] In some embodiments, the other end of the feed water pump (15) is provided with a first regulating valve (8); and the heat conducting oil storage tank (5) and the heat conducting oil pump (6) are provided with a second regulating valve (16).

[0013] In some embodiments, the magnesium-based solid-state storage tank (17) is internally provided with a plurality of porous trays (20) arranged at intervals to support the magnesium-based solid-state hydrogen storage material (21).

[0014] In some embodiments, the magnesium-based solid-state storage tank (17) has a heat exchange pipeline (22), which is one of a straight pipe, a spiral pipe, or a U-shaped pipe.

[0015] In some embodiments, the bulk volume of the magnesium-based hydrogen storage material (21) accounts for 70-80% of the magnesium-based solid-state hydrogen storage tank (17).

[0016] In some embodiments, the hydrogen charging control system (14) comprises an error comparison device (37), an error signal rate solver (35), a fuzzy logic control system (34), and a PID controller (36).

[0017] In a second aspect, the present application provides a hydrogen charging control method for the above-mentioned solid oxide electrolysis cell-magnesium-based solid-state hydrogen storage device, comprising:

[0018] S1: The outlet gas (600-900℃) of the solid oxide electrolysis cell (1) flows through the evaporator (2), and then sequentially passes through the condenser (3), the dryer (4), the hydrogen compressor (9), the first three-way valve (10), and enters the magnesium-based solid-state hydrogen storage device (12);

[0019] S2: The heat transfer oil in the heat transfer oil storage tank (5) sequentially passes through the second regulating valve (16), the heat transfer oil pump (6), the second three-way valve (13), and enters the magnesium-based solid-state hydrogen storage device (12), and after flowing through the heat exchange pipeline (22) inside the magnesium-based solid-state hydrogen storage tank (17), the temperature rises to about 300℃;

[0020] S3: The high-temperature heat transfer oil flows out of the heat transfer oil outlet (19) of the magnesium-based solid-state hydrogen storage tank (17), is mixed in the mixer (11), and then flows into the heat transfer oil storage tank (5) after heat exchange in the heat exchanger (7);

[0021] S4: The water passes through the first regulating valve (8), the water pump (15), the heat exchanger (7), and the evaporator (2) to become high-temperature steam (600-900℃), and then enters the solid oxide electrolysis cell (1);

[0022] S5: The heat generated in the hydrogen charging process of the magnesium-based solid-state hydrogen storage tank (17) is recovered by the heat transfer oil, which is used to evaporate and heat the water of the solid oxide electrolysis cell (1);

[0023] The hydrogen charging control system (14) real-time corrects the valve opening degree of the first three-way valve (10) according to the value of the thermometer 1 (27), which is used to maintain the average temperature inside the magnesium-based solid-state hydrogen storage tank (17); the hydrogen charging control system (14) real-time corrects the valve opening degree of the second three-way valve (13) according to the value of the thermometer 2 (26), which is used to maintain the temperature of the heat transfer oil outlet (19) of the magnesium-based solid-state hydrogen storage tank (17), which can maximize the electrolysis efficiency by about 10%.

[0024] In some embodiments, in S1, the hydrogen charging pressure of the magnesium-based solid-state hydrogen storage device (12) is about 1MPa.

[0025] In a third aspect, the present application provides a fuzzy logic based hydrogen filling control method, the method comprising:

[0026] S11: comparing the control system input signal (38) and the feedback signal (39) through the error comparison device (37) to form an error signal, and inputting the error signal into the error signal change rate solver (35) to obtain an error change rate signal, wherein the control system input signal (38) is the set value of the internal temperature of the magnesium-based solid storage tank (17) and the outlet temperature of the heat conducting oil (19), and the feedback signal (39) is the measured value of the thermometer 1 (27) and the thermometer 2 (26);

[0027] S12: inputting the error signal and the error change rate signal into the fuzzy logic control system (34) to obtain the proportional signal, the integral signal and the differential signal correction parameter of the PID controller (36) after fuzzy rule reasoning, wherein the error signal membership function (28) and the error change rate signal membership function (29) are Gaussian functions, and the specific calculation method is as follows:

[0028]

[0029] The proportional correction signal membership function (31), the integral correction signal membership function (32) and the integral correction signal membership function (33) are triangular membership functions, and the specific calculation method is as follows:

[0030]

[0031] S13: correcting the control parameters of the PID controller (36), and the correction method is as follows:

[0032]

[0033] Wherein, kp, ki and kd are real-time control parameters of the PID controller (36), kp0, ki0 and kd0 are initial control parameters of the PID controller (36), kp0、 ki0、 kd0 is the real-time control parameter of the PID controller (36), and is the output correction parameter of the fuzzy logic control system (34);

[0034] The control output parameter of the PID controller (36) is:

[0035]

[0036] Wherein, kp, ki, kd are real-time control parameters of the PID controller (36), e(t) is the error signal of the set value and the actual output of the system, and u(t) is the control signal (40) for controlling the valve opening of the first three-way valve (10) and the second three-way valve (13).

[0037] Further, the hydrogen charging control system (14) corrects the valve opening of the first three-way valve (10) in real time according to the value of thermometer 1 (27), so as to maintain the average temperature of the magnesium-based solid hydrogen storage tank (17) at about 400 DEG C; the hydrogen charging control system (14) corrects the valve opening of the second three-way valve (13) in real time according to the value of thermometer 2 (26), so as to maintain the temperature of the heat conducting oil outlet (19) of the magnesium-based solid hydrogen storage tank (17) at about 300 DEG C, and the temperature error is less than or equal to 5%.

[0038] Technical effects

[0039] The solid oxide electrolytic cell-magnesium-based solid hydrogen storage device and the hydrogen charging control method thereof have the advantages of high electrolysis efficiency, high volume hydrogen storage density, and convenient operation method.

[0040] Firstly, the fuzzy intelligent control technology is used to adjust the flow of the heat exchange medium, and the hydrogen absorption temperature is controlled online, so that the heat is quickly transferred in the hydrogen absorption process.

[0041] Secondly, the optimal heat integration path of the magnesium-based solid hydrogen storage and the solid oxide electrolytic cell is designed, and the heat generated in the hydrogen absorption process is recovered, so that the electrolysis efficiency of the solid oxide electrolytic cell is improved.

[0042] The present application has low safety risk, high energy efficiency and low cost, and has very important significance for the promotion and application of the electrolytic hydrogen production technology and the hydrogen storage and transportation technology. DETAILED DESCRIPTION

[0043] Figure 1 is a solid oxide electrolytic cell-magnesium-based solid device schematic diagram of a preferred embodiment of the present application;

[0044] Figure 2 is a magnesium-based solid storage tank internal structure schematic diagram of a preferred embodiment of the present application;

[0045] Figure 3 is a hydrogen charging control system structure diagram of a preferred embodiment of the present application;

[0046] Figure 4 is a magnesium-based solid storage tank hydrogen charging rate curve of a preferred embodiment of the present application. DETAILED DESCRIPTION

[0047] The preferred embodiments of the present application are described below with reference to the accompanying drawings, so that the technical contents can be more clear and convenient to understand. The present application can be embodied in many different forms, and the protection scope of the present application is not limited to the embodiments mentioned herein.

[0048] Embodiment 1

[0049] In the drawings, the components with the same structure are denoted by the same reference numerals, and the components with the similar structure or function are denoted by the similar reference numerals. The size and thickness of each component shown in the drawings are arbitrarily shown, and the present application is not limited to the size and thickness of each component. In order to make the drawing clearer, the components are appropriately exaggerated in some places in the drawing.

[0050] As Figure 1 shown, a solid oxide electrolysis cell-magnesium-based solid hydrogen storage device includes a solid oxide electrolysis cell (1), a magnesium-based solid hydrogen storage device (12), a hydrogen charging control system (14);

[0051] The magnesium-based solid hydrogen storage device (12) is composed of at least one magnesium-based solid storage tank (17), which has a hydrogen inlet (18), a heat conducting oil inlet (25), a heat conducting oil outlet (19), a magnesium-based solid hydrogen storage material (21), a thermometer 1 (27) for measuring the internal temperature of the magnesium-based solid storage tank (17), and a thermometer 2 (26) for measuring the heat conducting oil outlet temperature of the magnesium-based solid storage tank (17); a plurality of perforated trays (20) are arranged inside the magnesium-based solid storage tank (17) to support the magnesium-based solid hydrogen storage material (21); the magnesium-based solid storage tank (17) has a heat exchange pipeline (22), which is a spiral pipe; the stacking volume of the magnesium-based hydrogen storage material (21) accounts for 70-80% of the magnesium-based solid storage tank (17).

[0052] The solid oxide electrolysis cell (1) and the magnesium-based solid hydrogen storage device (12) are provided with an evaporator (2), a condenser (3), a dryer (4) and a hydrogen compressor (9) connected through a hydrogen / hydrogen-rich gas flow pipeline, wherein the hydrogen inlet (18) of the magnesium-based solid storage tank (17) is connected with the hydrogen compressor (9) through a first three-way valve (10);

[0053] The heat exchanger (7) is also connected with a feed water pump (15), an evaporator (2) and the solid oxide electrolysis cell (1) through a water / water vapor pipeline respectively; the other end of the feed water pump (15) is provided with a first regulating valve (8); a second regulating valve (16) is arranged between the heat conducting oil storage tank (5) and the heat conducting oil pump (6);

[0054] The hydrogen filling control system (14) corrects the valve opening of the first three-way valve (10) in real time according to the value of the thermometer 1 (27) to maintain the average temperature inside the magnesium-based solid-state hydrogen storage tank (17); the hydrogen filling control system (14) corrects the valve opening of the second three-way valve (13) in real time according to the value of the thermometer 2 (26) to maintain the temperature of the heat conducting oil outlet (19) of the magnesium-based solid-state hydrogen storage tank (17).

[0055] As shown in Figure 2 The magnesium-based solid-state hydrogen storage tank (17) has a volume of about 0.5m 3 , including a hydrogen inlet (18), a heat conducting oil inlet (25), a heat conducting oil outlet (19), a magnesium-based solid-state hydrogen storage material (21), a heat exchange pipeline (22), a porous tray (20), a gap (25), a stainless steel outer wall (23), a thermometer 1 (27), and a thermometer 2 (26); the total hydrogen storage capacity is 50kg. The heat exchange pipeline (22) is arranged in the middle of the magnesium-based solid-state hydrogen storage tank (17), and the heat exchange pipeline (22) is one of a straight pipe, a spiral pipe or a U-shaped pipe; the porous tray (20) is arranged at intervals inside the magnesium-based solid-state hydrogen storage tank (17) to support the magnesium-based solid-state hydrogen storage material (21), and the total filling amount of the solid-state hydrogen storage material is about 720kg.

[0056] As shown in Figure 3 The hydrogen filling control system includes an error comparison device (37), an error signal change rate solver (35), a fuzzy logic control system (34), and a PID controller (36). Specifically, the hydrogen filling control system (14) corrects the valve opening of the first three-way valve (10) in real time according to the value of the thermometer 1 (27) to maintain the average temperature inside the magnesium-based solid-state hydrogen storage tank (17); the hydrogen filling control system (14) corrects the valve opening of the second three-way valve (13) in real time according to the value of the thermometer 2 (26) to maintain the temperature of the heat conducting oil outlet (19) of the magnesium-based solid-state hydrogen storage tank (17), which can increase the electrolysis efficiency by about 10%.

[0057] As shown in Figure 4 The hydrogen filling rate curve at a hydrogen filling pressure of 1MPa, a constant hydrogen filling temperature of 200℃, 300℃, and 400℃.

[0058] The magnesium-based solid-state hydrogen storage device (12) starts to fill hydrogen and exchange heat with the solid oxide electrolytic cell (1) according to the following steps.

[0059] S0: Use the existing technology to complete the preheating and starting of the solid oxide electrolytic cell (1) to start producing hydrogen.

[0060] S1: The outlet gas (600-900℃) of the solid oxide electrolyzer (1) flows through the evaporator (2), and then through the condenser (3), the dryer (4), the hydrogen compressor (9), the first three-way valve (10), and then enters the magnesium-based solid-state hydrogen storage device (12). The hydrogen charging pressure of the magnesium-based solid-state hydrogen storage device (12) is about 1 MPa.

[0061] S2: The heat conducting oil in the heat conducting oil storage tank (5) enters the magnesium-based solid-state hydrogen storage device (12) through the second regulating valve (16), the heat conducting oil pump (6), and the second three-way valve (13), and then flows through the heat exchange pipe (22) inside the magnesium-based solid-state hydrogen storage tank (17) to increase the temperature to about 300℃.

[0062] S3: The high-temperature heat conducting oil flows out of the heat conducting oil outlet (19) of the magnesium-based solid-state hydrogen storage tank (17), mixes in the mixer (11), and then flows into the heat conducting oil storage tank (5) after heat exchange in the heat exchanger (7).

[0063] S4: The feed water becomes high-temperature steam (600-900℃) after passing through the first regulating valve (8), the feed water pump (15), the heat exchanger (7), and the evaporator (2), and then enters the solid oxide electrolyzer (1).

[0064] S5: The heat generated during the hydrogen charging process of the magnesium-based solid-state hydrogen storage tank (17) is recovered by the heat conducting oil, which is used to evaporate and heat the feed water of the solid oxide electrolyzer (1).

[0065] The hydrogen charging control system (14) adjusts the valve opening of the first three-way valve (10) in real time according to the value of thermometer 1 (27) to maintain the average temperature inside the magnesium-based solid-state hydrogen storage tank (17) at about 400℃. The hydrogen charging control system (14) adjusts the valve opening of the second three-way valve (13) in real time according to the value of thermometer 2 (26) to maintain the temperature of the heat conducting oil outlet (19) of the magnesium-based solid-state hydrogen storage tank (17) at about 300℃.

Claims

1. A solid oxide electrolytic cell-magnesium-based solid-state hydrogen storage device, comprising a solid oxide electrolytic cell (1), a magnesium-based solid-state hydrogen storage device (12), and a hydrogen charging control system (14); The magnesium-based solid-state hydrogen storage device (12) is composed of at least one magnesium-based solid-state storage tank (17), wherein the magnesium-based solid-state storage tank (17) has a hydrogen inlet (18), a heat transfer oil inlet (25), a heat transfer oil outlet (19), a magnesium-based solid-state hydrogen storage material (21), a thermometer 1 (27) for measuring the internal temperature of the magnesium-based solid-state storage tank (17), and a thermometer 2 (26) for measuring the temperature of the heat transfer oil outlet of the magnesium-based solid-state storage tank (17); An evaporator (2), a condenser (3), a dryer (4) and a hydrogen compressor (9) are provided between the solid oxide electrolytic cell (1) and the magnesium-based solid-state hydrogen storage device (12), and are connected via a hydrogen / hydrogen-rich gas flow pipeline, wherein: The hydrogen inlet (18) of the magnesium-based solid-state storage tank (17) is connected to the hydrogen compressor (9) via a first three-way valve (10); The heat transfer oil outlet (19) of the magnesium-based solid-state storage tank (17) is connected in sequence to a mixer (11), a heat exchanger (7), a heat transfer oil storage tank (5), a heat transfer oil pump (6), and a heat transfer oil inlet (25) of the magnesium-based solid-state storage tank (17) through a heat transfer oil flow pipeline, wherein the heat transfer oil inlet (25) of the magnesium-based solid-state storage tank (17) is connected to the heat transfer oil pump (6) through a second three-way valve (13); The heat exchanger (7) is also connected to the water feed pump (15), the evaporator (2) and the solid oxide electrolytic cell (1) respectively through water / steam pipelines; The hydrogen charging control system (14) corrects the valve opening of the first three-way valve (10) in real time according to the value of the thermometer 1 (27) to maintain the internal average temperature of the magnesium-based solid-state storage tank (17); the hydrogen charging control system (14) corrects the valve opening of the second three-way valve (13) in real time according to the value of the thermometer 2 (26) to maintain the temperature of the thermal oil outlet (19) of the magnesium-based solid-state storage tank (17).

2. The solid oxide electrolyzer-magnesium-based solid-state hydrogen storage device according to claim 1, wherein: A first regulating valve (8) is provided at the other end of the water supply pump (15); and a second regulating valve (16) is provided between the thermal oil storage tank (5) and the thermal oil pump (6).

3. The solid oxide electrolyzer-magnesium-based solid-state hydrogen storage device according to claim 1, wherein: A plurality of porous trays (20) are provided inside the magnesium-based solid-state storage tank (17), and the porous trays (20) are arranged at intervals and are used to support magnesium-based solid-state hydrogen storage materials (21).

4. The solid oxide electrolyzer-magnesium-based solid-state hydrogen storage device according to claim 1, wherein: The magnesium-based solid-state storage tank (17) has a heat exchange pipe (22), and the heat exchange pipe (22) is a straight pipe, a spiral pipe, or a U-shaped pipe.

5. The solid oxide electrolytic cell-magnesium-based solid-state hydrogen storage device according to claim 1, wherein: The stacked volume of the magnesium-based hydrogen storage material (21) accounts for 70-80% of the magnesium-based solid-state storage tank (17).

6. The solid oxide electrolytic cell-magnesium-based solid-state hydrogen storage device according to claim 1, wherein: The hydrogen charging control system (14) includes an error comparison device (37), an error signal change rate solver (35), a fuzzy logic control system (34) and a PID controller (36).

7. A method for controlling the hydrogen charging of the solid oxide electrolytic cell-magnesium-based solid-state hydrogen storage device according to claim 2, comprising: S1: The outlet gas of the solid oxide electrolytic cell (1) flows through the evaporator (2), and then sequentially passes through the condenser (3), the dryer (4), the hydrogen compressor (9), the first three-way valve (10), and then enters the magnesium-based solid hydrogen storage device (12); S2: The heat transfer oil in the heat transfer oil storage tank (5) passes through the second regulating valve (16), the heat transfer oil pump (6), and the second three-way valve (13) in sequence and then enters the magnesium-based solid hydrogen storage device (12). The temperature of the heat transfer oil increases after flowing through the heat exchange pipe (22) inside the magnesium-based solid hydrogen storage tank (17); S3: The high-temperature heat transfer oil flows out of the heat transfer oil outlet (19) of the magnesium-based solid storage tank (17), is mixed in the mixer (11), and then flows into the heat transfer oil storage tank (5) after heat exchange in the heat exchanger (7); S4: The feed water passes through the first regulating valve (8), the feed water pump (15), the heat exchanger (7) and the evaporator (2) to become high-temperature steam, and then enters the solid oxide electrolysis cell (1); S5: recovering heat generated during the hydrogen charging process of the magnesium-based solid storage tank (17) through thermal oil, which is used for evaporation and heating the feed water of the solid oxide electrolyzer (1); The hydrogen charging control system (14) corrects the valve opening of the first three-way valve (10) in real time according to the value of the thermometer 1 (27) to maintain the internal average temperature of the magnesium-based solid-state storage tank (17); the hydrogen charging control system (14) corrects the valve opening of the second three-way valve (13) in real time according to the value of the thermometer 2 (26) to maintain the temperature of the thermal oil outlet (19) of the magnesium-based solid-state storage tank (17).

8. The hydrogen charging control method according to claim 7, wherein: In S1, the hydrogen filling pressure of the magnesium-based solid-state hydrogen storage device (12) is 1 MPa.

9. A hydrogen charging control method based on fuzzy logic, for controlling the solid oxide electrolytic cell-magnesium-based solid hydrogen storage device according to claim 6, the method comprising: S11: Comparing the control system input signal (38) and the feedback signal (39) through the error comparison device (37) to form an error signal, and inputting the error signal change rate solver (35) to obtain an error change rate signal, wherein the control system input signal (38) is the set value of the internal temperature of the magnesium-based solid storage tank (17) and the temperature of the heat transfer oil outlet (19), and the feedback signal (39) is the measured value of the thermometer 1 (27) and the thermometer 2 (26); S12: The fuzzy logic control system (34) takes the error signal and the error signal change rate as input, and obtains the proportional signal, integral signal and differential signal correction parameters of the PID controller (36) after fuzzy rule reasoning, wherein the error signal membership function (28) and the error change rate signal membership function (29) are Gaussian functions, and the specific calculation method is: The proportional correction signal membership function (31), the integral correction signal membership function (32) and the integral correction signal membership function (33) are triangular membership functions, and the specific calculation method is: S13: Correct the control parameters of the PID controller (36) by: Wherein, kp, ki, kd are real-time control parameters of the PID controller (36), kp0, ki0, kd0 are initial control parameters of the PID controller (36), kp0, ki0、 kd0 is a real-time control parameter of the PID controller (36) and an output correction parameter of the fuzzy logic control system (34); The control output parameter of the PID controller (36) is: Wherein, kp, ki, and kd are real-time control parameters of the PID controller (36), e(t) is the error signal between the set value and the actual output of the system, and u(t) is the control signal (40) for controlling the valve opening of the first three-way valve (10) and the second three-way valve (13).

10. The hydrogen charging control method based on fuzzy logic according to claim 9, wherein: The hydrogen charging control system (14) corrects the valve opening of the first three-way valve (10) in real time according to the value of the thermometer 1 (27), maintaining the average temperature inside the magnesium-based solid storage tank (17) at 400°C; the hydrogen charging control system (14) corrects the valve opening of the second three-way valve (13) in real time according to the value of the thermometer 2 (26), maintaining the temperature of the heat transfer oil outlet (19) of the magnesium-based solid storage tank (17) at 300°C, with a temperature error of ≤±5%.

Images