Device and method for monitoring state of electrolytic hydrogen production tank based on optical fiber sensing

Abstract

The invention provides an electrolytic hydrogen production tank state monitoring device and method based on optical fiber sensing, and the device is characterized in that the device comprises a plurality of optical fiber Bragg grating temperature sensors which are disposed on an electrolytic hydrogen production tank and are used for measuring the surface temperature of the electrolytic hydrogen production tank, and forming a temperature reflection spectrum; the at least one fiber bragg grating strain sensor is arranged on the electrolytic hydrogen production tank and is used for measuring the surface strain of the electrolytic hydrogen production tank to form a strain reflection spectrum; the fiber bragg grating demodulator is connected with the plurality of fiber bragg grating temperature sensors and the fiber bragg grating strain sensor and is used for receiving the temperature reflection spectrum and the strain reflection spectrum; and the upper computer is connected with the fiber bragg grating demodulator through a communication assembly and is used for decoupling and analyzing the temperature reflection spectrum and the strain reflection spectrum to obtain the surface temperature and strain data of the electrolytic hydrogen production tank.

Description

Technical Field

[0001] The present invention relates to the technical field of electrolytic hydrogen production, and particularly relates to a device and method for monitoring the state of an electrolytic hydrogen production tank based on optical fiber sensing. Background Art

[0002] Hydrogen energy is a clean, low-carbon, flexible and efficient energy source, and is one of the important tools for achieving the "dual carbon" goal. Electrolyzing water with renewable energy to produce hydrogen is the main way to obtain "green hydrogen". The electrolytic hydrogen production tank is the core component of the electrolytic hydrogen production system.

[0003] In the scenario of hydrogen production with renewable energy, due to the volatility of renewable energy, the state of the electrolytic hydrogen production tank is often in a fluctuating state. And because large-scale electrolytic hydrogen production tanks are large in volume and have strong state inconsistencies, their failure is strongly correlated with state parameters such as temperature and stress. Therefore, monitoring the state of the electrolytic hydrogen production tank is of great significance for the efficient and stable operation of the electrolytic hydrogen production tank.

[0004] However, there is a lack of existing equipment for real-time state monitoring of electrolytic hydrogen production tanks and a lack of real-time state monitoring methods. In the face of the scenario of renewable energy fluctuations, the state of the electrolytic hydrogen production tank fluctuates greatly, and it is impossible to optimize and control the hydrogen production system in real time, resulting in the electrolytic hydrogen production tank not being able to operate stably in the high-efficiency range. Summary of the Invention

[0005] The present invention is made to solve the above problems, and aims to provide a device and method for monitoring the state of an electrolytic hydrogen production tank based on optical fiber sensing.

[0006] An apparatus for monitoring the state of an electrolytic hydrogen production tank based on optical fiber sensing, for monitoring the state of the electrolytic hydrogen production tank, having the following characteristics, includes: a plurality of fiber Bragg grating temperature sensors disposed on the electrolytic hydrogen production tank for measuring the surface temperature of the electrolytic hydrogen production tank to form a temperature reflection spectrum; at least one fiber Bragg grating strain sensor disposed on the electrolytic hydrogen production tank for measuring the surface strain of the electrolytic hydrogen production tank to form a strain reflection spectrum; a fiber grating demodulator connected to the plurality of fiber Bragg grating temperature sensors and the fiber Bragg grating strain sensors for receiving the temperature reflection spectrum and the strain reflection spectrum; and a host computer connected to the fiber grating demodulator through a communication component for decoupling and analyzing the temperature reflection spectrum and the strain reflection spectrum to obtain the surface temperature and strain data of the electrolytic hydrogen production tank.

[0007] In the apparatus for monitoring the state of an electrolytic hydrogen production tank based on optical fiber sensing provided by the present invention, it may further have the following characteristics: wherein, the electrolytic hydrogen production tank is composed of N small chambers arranged axially, and the plurality of fiber Bragg grating temperature sensors are uniformly arranged circumferentially on the plate surfaces of the N small chambers.

[0008] In the electrolytic hydrogen production cell state monitoring device based on optical fiber sensing provided by the present invention, it may further have the following characteristics: Each fiber Bragg grating temperature sensor has a temperature optical fiber core that extends axially. N temperature Bragg gratings are etched axially on the temperature optical fiber core, and each temperature Bragg grating corresponds to the position of each plate; a cladding material that covers the surface of the temperature optical fiber core and is arranged concentrically with the temperature optical fiber core.

[0009] In the electrolytic hydrogen production cell state monitoring device based on optical fiber sensing provided by the present invention, it may further have the following characteristics: The cladding material is a polymer material.

[0010] In the electrolytic hydrogen production cell state monitoring device based on optical fiber sensing provided by the present invention, it may further have the following characteristics: The fiber Bragg grating strain sensor is arranged near one of the fiber Bragg grating temperature sensors.

[0011] In the electrolytic hydrogen production cell state monitoring device based on optical fiber sensing provided by the present invention, it may further have the following characteristics: The fiber Bragg grating strain sensor has a strain optical fiber core that extends axially. N strain Bragg gratings are etched along the length direction of the strain optical fiber core, and each strain Bragg grating corresponds to the position of each plate.

[0012] The present invention also provides a monitoring method for an electrolytic hydrogen production cell state monitoring device based on optical fiber sensing, which specifically includes the following steps: S1: Determine the temperature measurement and strain measurement sites according to the size and number of compartments of the electrolytic hydrogen production cell; S2: Prepare multiple fiber Bragg grating temperature sensors and fiber Bragg grating strain sensors based on femtosecond laser processing technology. Using wavelength division multiplexing technology, etch N temperature Bragg gratings in the same temperature optical fiber core and N strain Bragg gratings in the strain optical fiber core, so as to measure temperature data at different positions using the N temperature Bragg gratings and measure strain data at different positions using the N strain Bragg gratings; select the cladding material for the fiber Bragg grating temperature sensors; S3: Calibrate the temperature of each fiber Bragg grating temperature sensor and calibrate the strain of the fiber Bragg grating strain sensor; S4: Arrange multiple fiber Bragg grating temperature sensors and fiber Bragg grating strain sensors on the plate surface of the compartment; S5: Connect multiple fiber Bragg grating temperature sensors and fiber Bragg grating strain sensors to a fiber grating demodulator, and the fiber grating demodulator is connected to a host computer through a communication component; S6: Place the electrolytic hydrogen production cell into the electrolytic hydrogen production system for operation and conduct electrolytic hydrogen production tests.

[0013] S7: Preset the upper limits of the surface temperature, strain data and their change rates of the electrolytic hydrogen production cell; S8: Receive the temperature reflection spectrum and strain reflection spectrum through the fiber Bragg grating demodulator, and perform temperature analysis, strain-temperature decoupling, and strain analysis through the host computer software to obtain the surface temperature and strain data of the electrolytic hydrogen production cell in real time; S9: Analyze in real time whether the surface temperature, strain data and their change rates of the electrolytic hydrogen production cell exceed the preset upper limits. When they exceed the preset upper limits, directly stop the machine. When they do not reach the preset upper limits, continue to run.

[0014] Functions and Effects of the Invention

[0015] According to a state monitoring device and method for an electrolytic hydrogen production cell based on optical fiber sensing involved in the present invention, by closely attaching fiber Bragg grating temperature sensors and fiber Bragg grating strain sensors to the plate surfaces of multiple chambers, the surface temperature and strain of the electrolytic hydrogen production cell can be measured in real time. The introduction of fiber Bragg grating temperature sensors and fiber Bragg grating strain sensors does not affect the operation function and safety of the existing electrolytic hydrogen production cell. In the face of renewable energy fluctuation scenarios, real-time optimal control of the hydrogen production system can be carried out, enabling the electrolytic hydrogen production cell to operate stably in the high-efficiency range. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of a state monitoring device for an electrolytic hydrogen production cell based on optical fiber sensing in an embodiment of the present invention;

[0017] Figure 2 is a schematic structural diagram of an electrolytic hydrogen production cell in an embodiment of the present invention;

[0018] Figure 3 is a cross-sectional view of an electrolytic hydrogen production cell in an embodiment of the present invention.

[0019] Description of the Main Component Symbols:

[0020] In the figure: 100, a state monitoring device for an electrolytic hydrogen production cell based on optical fiber sensing; 101, an electrolytic hydrogen production cell; 103, a fiber Bragg grating demodulator; 104, a communication component; 105, a host computer; 1, an end plate; 2, a bolt; 3, a plate; 4, an ear; 5, a fiber Bragg grating temperature sensor; 6, a fiber Bragg grating strain sensor. Detailed Embodiments

[0021] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a connection that allows mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0022] In order to make the technical means, creative features, achieved purposes, and effects of the present invention easy to understand, the following embodiments will specifically describe the electrolytic hydrogen production tank state monitoring device and monitoring method based on fiber optic sensing of the present invention in conjunction with the accompanying drawings.

[0023] Figure 1 It is a schematic structural diagram of the electrolytic hydrogen production tank state monitoring device 100 based on fiber optic sensing in an embodiment of the present invention.

[0024] As Figure 1 shown, the electrolytic hydrogen production tank state monitoring device (hereinafter referred to as the monitoring device) 100 based on fiber optic sensing in this embodiment is used to monitor the state of the electrolytic hydrogen production tank 101, and includes a plurality of fiber Bragg grating temperature sensors 5, at least one fiber Bragg grating strain sensor 6, a fiber grating demodulator 103, and a host computer 105.

[0025] The electrolytic hydrogen production tank 101 is one of an alkaline electrolytic hydrogen production tank or a proton exchange membrane electrolytic hydrogen production tank.

[0026] Figure 2 It is a schematic structural diagram of the electrolytic hydrogen production tank 101 in an embodiment of the present invention.

[0027] As Figure 2 shown, the electrolytic hydrogen production tank 101 is composed of N small chambers arranged axially. The two outermost small chambers at both ends are respectively connected to two end plates 1, and the two end plates 1 are fixedly connected by a plurality of bolts 2. One side of each end plate 1 is provided with a lug 4.

[0028] Specifically, the electrolytic hydrogen production tank 101 in this embodiment is composed of 28 small chambers. The small chambers are sealed by sealing rings. Each small chamber is formed by combining a plate 3, a porous transport layer, a PPS diaphragm, and a sealing ring.

[0029] Figure 3 It is a cross-sectional view of the electrolytic hydrogen production tank 101 in an embodiment of the present invention.

[0030] As Figures 2-3As shown, multiple fiber Bragg grating temperature sensors 5 are uniformly arranged circumferentially on the surface of the plates 3 of N compartments, used to measure the surface temperature of each compartment of the electrolytic hydrogen production cell 101, and form a temperature reflection spectrum.

[0031] Each fiber Bragg grating temperature sensor 5 has a temperature fiber core and a cladding material.

[0032] The temperature fiber core extends axially, and N temperature Bragg gratings are etched axially. Each temperature Bragg grating corresponds to the position of each plate 3. The temperature fiber core itself has insulation and good stability.

[0033] The cladding material covers the surface of the temperature fiber core and is arranged concentrically with the temperature fiber core, and is a polymer material. In this embodiment, the cladding material is polyether ether ketone PEEK, which has the characteristics of alkali resistance and high temperature resistance.

[0034] Specifically, in this embodiment, four fiber Bragg grating temperature sensors 5 are used, which are uniformly arranged circumferentially on the surface of 28 plates 3 and are in close contact with the 28 plates 3. 28 temperature Bragg gratings are etched on each fiber Bragg grating temperature sensor 5, and the temperatures of 28 measurement sites can be measured simultaneously.

[0035] The fiber Bragg grating strain sensor 6 is arranged near one of the fiber Bragg grating temperature sensors 5, used to measure the surface strain of each compartment of the electrolytic hydrogen production cell 101, and form a strain reflection spectrum.

[0036] The fiber Bragg grating strain sensor 6 has a strain fiber core that extends axially. The strain fiber core itself has insulation and good stability. N strain Bragg gratings are etched along the length direction of the strain fiber core, and each strain Bragg grating corresponds to the position of each plate 3.

[0037] Specifically, in this embodiment, one fiber Bragg grating strain sensor 6 is used, which is arranged near the uppermost fiber Bragg grating temperature sensor 5 and is in close contact with the 28 plates 3. 28 strain Bragg gratings are etched on each fiber Bragg grating strain sensor 6, and the strains of 28 measurement sites can be measured simultaneously.

[0038] Both the temperature Bragg grating and the strain Bragg grating are Bragg gratings FBG.

[0039] The fiber grating demodulator 103 is connected to multiple fiber Bragg grating temperature sensors 5 and fiber Bragg grating strain sensors 6, used to receive the temperature reflection spectrum and the strain reflection spectrum.

[0040] The host computer 105 is connected to the fiber grating demodulator 103 through the communication component 104, and is used to decouple and analyze the temperature reflection spectrum and the strain reflection spectrum to obtain the surface temperature and strain data of the electrolytic hydrogen production tank 101.

[0041] Based on the above monitoring device 100, this embodiment also provides a corresponding monitoring method for the electrolytic hydrogen production tank state monitoring device based on fiber optic sensing. The method includes the following steps:

[0042] S1: Based on the number of compartments and the structure of the electrolytic hydrogen production tank 101, determine to use 28 strain measurement sites and 112 temperature measurement sites.

[0043] S2: Prepare four fiber Bragg grating temperature sensors 5 and one fiber Bragg grating strain sensor 6 based on femtosecond laser processing technology. Using wavelength division multiplexing technology, etch 28 temperature Bragg gratings in the core of the same temperature optical fiber, and etch 28 strain Bragg gratings in the core of one strain optical fiber. The cladding material of the fiber Bragg grating temperature sensor 5 is the polymer material polyether ether ketone PEEK.

[0044] S3: Calibrate the temperature reflection spectrum of each fiber Bragg grating temperature sensor 5 in a constant temperature container. Since the Bragg grating reflection spectrum is affected by temperature and strain, and the center wavelength of the Bragg grating reflection spectrum is linearly affected by temperature and strain, the strain of the measured site can be measured by compensating the temperature of the fiber Bragg grating strain sensor 6, that is, the strain calibration of the strain reflection spectrum of the fiber Bragg grating strain sensor 6 can be carried out.

[0045] S4: Attach the four fiber Bragg grating temperature sensors 5 tightly and evenly along the circumference to the surface of the 28 electrodes 3, and place the fiber Bragg grating strain sensor 6 near the uppermost fiber Bragg grating temperature sensor 5 and tightly attach it to the surface of the 28 electrodes 3.

[0046] S5: Connect the four fiber Bragg grating temperature sensors 5 and the fiber Bragg grating strain sensor 6 to the fiber grating demodulator 103. The fiber grating demodulator 103 is connected to the host computer 105 through the communication component 104.

[0047] S6: Place the electrolytic hydrogen production tank 101 into the electrolytic hydrogen production system for operation and conduct electrolytic hydrogen production tests.

[0048] S7: Preset the surface temperature and strain data of the electrolytic hydrogen production tank 101 and the upper limit of the change rate.

[0049] S8: Receive the temperature reflection spectrum and strain reflection spectrum through the fiber Bragg grating demodulator 103, and perform temperature analysis, strain-temperature decoupling, and strain analysis through the software of the host computer 105 to obtain the surface temperature and strain data of the electrolytic hydrogen production cell 101 during operation in real time.

[0050] S9: Whether the surface temperature and strain data of the electrolytic hydrogen production cell 101 in real time and their change rates exceed the preset upper limit. When they exceed the preset upper limit, directly stop the machine. When they do not reach the preset upper limit, continue to run.

[0051] Functions and effects of the embodiment

[0052] According to the electrolytic hydrogen production cell state monitoring device 100 and failure warning method based on fiber optic sensing involved in the present invention, the following beneficial effects are achieved:

[0053] By closely attaching the fiber Bragg grating temperature sensor 5 and the fiber Bragg grating strain sensor 6 to the surface of the electrode plates 3 of multiple compartments, the surface temperature and strain of the electrolytic hydrogen production cell 101 can be measured in real time. The introduction of the fiber Bragg grating temperature sensor 5 and the fiber Bragg grating strain sensor 6 does not affect the operation function and safety of the existing electrolytic hydrogen production cell 101. In the face of renewable energy fluctuation scenarios, it can perform real-time optimization control on the hydrogen production system, enabling the electrolytic hydrogen production cell 101 to operate stably in the high-efficiency range.

[0054] The coating material of the fiber Bragg grating temperature sensor 5 is polyether ether ketone PEEK, which has the characteristics of alkali resistance and high temperature resistance, ensuring the stability of the work. The fiber Bragg grating temperature sensor 8 and the fiber Bragg grating strain sensor 5 have insulation and corrosion resistance, and the overall volume is small and convenient for installation. When they are attached to the electrode plates 3 of multiple compartments, they can ensure the stability of the work. At the same time, the multiple etched Bragg gratings in the fiber Bragg grating temperature sensor 5 and the fiber Bragg grating strain sensor 6 can measure the surface multi-point temperature / strain of the electrolytic hydrogen production cell 101 with a single optical fiber, thus efficiently realizing distributed measurement. Through the real-time monitoring of the multi-site temperature and strain on the surface of the electrolytic hydrogen production cell 101, the state information of the electrolytic hydrogen production cell 101 can be effectively monitored, facilitating the timely failure warning of the electrolytic hydrogen production cell 101.

[0055] Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for monitoring the state of an electrolytic hydrogen production tank based on optical fiber sensing, used to monitor the state of an electrolytic hydrogen production tank, characterized in that: include: A plurality of fiber Bragg grating temperature sensors are arranged on the electrolytic hydrogen production tank and are used to measure the surface temperature of the electrolytic hydrogen production tank to form a temperature reflection spectrum; At least one fiber Bragg grating strain sensor is disposed on the electrolytic hydrogen production tank and is used to measure the surface strain of the electrolytic hydrogen production tank to form a strain reflection spectrum; A fiber Bragg grating demodulator connected to the plurality of fiber Bragg grating temperature sensors and the fiber Bragg grating strain sensors, and configured to receive the temperature reflection spectrum and the strain reflection spectrum; The host computer is connected to the fiber grating demodulator through a communication component, and is used for decoupling and analyzing the temperature reflection spectrum and the strain reflection spectrum to obtain the surface temperature and strain data of the electrolytic hydrogen production tank.

2. The device for monitoring the state of an electrolytic hydrogen production tank based on optical fiber sensing according to claim 1 is characterized in that: The electrolytic hydrogen production tank is composed of N small chambers arranged along the axial direction. The plurality of fiber Bragg grating temperature sensors are uniformly arranged on the surface of the pole plates of the N small chambers along the circumferential direction.

3. The device for monitoring the state of an electrolytic hydrogen production tank based on optical fiber sensing according to claim 1, characterized in that: in, Each of the fiber Bragg grating temperature sensors has: A temperature optical fiber core extends along the axial direction, and N temperature Bragg gratings are etched on the temperature optical fiber core along the axial direction, and each temperature Bragg grating corresponds to the position of each electrode plate; The covering material covers the surface of the temperature optical fiber core and is arranged coaxially with the temperature optical fiber core.

4. The device for monitoring the state of an electrolytic hydrogen production tank based on optical fiber sensing according to claim 3 is characterized in that: in, The covering material is a polymer material.

5. The device for monitoring the state of an electrolytic hydrogen production tank based on optical fiber sensing according to claim 2 is characterized in that: in, The fiber Bragg grating strain sensor is arranged near one of the fiber Bragg grating temperature sensors.

6. The device for monitoring the state of an electrolytic hydrogen production tank based on optical fiber sensing according to claim 5 is characterized in that: The fiber Bragg grating strain sensor has a strain fiber core extending along the axial direction. The strain fiber core is etched with N strain Bragg gratings along the length direction, and each strain Bragg grating corresponds to the position of each pole plate.

7. A monitoring method for a hydrogen production electrolysis tank state monitoring device based on optical fiber sensing, implemented based on the hydrogen production electrolysis tank state monitoring device based on optical fiber sensing according to any one of claims 1 to 6, characterized in that: The specific steps include: S1: Determine the temperature measurement and strain measurement sites according to the size and number of cells of the electrolytic hydrogen production tank; S2: Based on femtosecond laser processing technology, a plurality of the fiber Bragg grating temperature sensors and the fiber Bragg grating strain sensors are prepared. By using wavelength division multiplexing technology, N temperature Bragg gratings are etched in the same temperature fiber core, and N strain Bragg gratings are etched in the strain fiber core, so as to measure temperature data at different positions by using the N temperature Bragg gratings, and measure strain data at different positions by using the N strain Bragg gratings; Selecting the coating material of the fiber Bragg grating temperature sensor; S3: performing temperature calibration on each of the fiber Bragg grating temperature sensors, and performing strain calibration on the fiber Bragg grating strain sensor; S4: placing a plurality of the fiber Bragg grating temperature sensors and the fiber Bragg grating strain sensors on the surface of the electrode plate of the chamber; S5: connecting a plurality of the fiber Bragg grating temperature sensors and the fiber Bragg grating strain sensors to the fiber Bragg grating demodulator, and the fiber Bragg grating demodulator is connected to the host computer through the communication component; S6: placing the electrolytic hydrogen production cell into an electrolytic hydrogen production system for operation to perform an electrolytic hydrogen production test; S7: Presetting the surface temperature and strain data of the electrolytic hydrogen production tank and the upper limit of the rate of change; S8: receiving the temperature reflection spectrum and the strain reflection spectrum through the fiber Bragg grating demodulator, performing temperature analysis, strain-temperature decoupling, and strain analysis through the host computer software, and obtaining the surface temperature and strain data of the electrolytic hydrogen production tank in real time; S9: Real-time analysis of the surface temperature and strain data of the electrolytic hydrogen production tank and their rate of change to see whether they exceed a preset upper limit, directly shutting down the system if the preset upper limit is exceeded, and continuing to operate if the preset upper limit is not reached.

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