SOC electric pile temperature measurement system based on fiber grating array and use method of SOC electric pile temperature measurement system

Abstract

The invention relates to the technical field of solid oxide fuel cells, and discloses an SOC electric pile temperature measurement system based on a fiber grating array and a use method of the SOC electric pile temperature measurement system. A plurality of optical fiber temperature sensors arranged in an array are inserted into the high-temperature furnace to measure the internal temperature of the solid oxide stack, the exteriors of the optical fiber temperature sensors are connected with an optical fiber demodulator, and the optical fiber demodulator demodulates wavelength signals transmitted by the optical fiber temperature sensors and uploads the wavelength signals to an upper computer; and the upper computer processes the wavelength data and converts the wavelength data into temperature data. The optical fiber temperature sensor of the temperature measurement system is provided with a plurality of temperature measurement gratings and a reference grating, the temperature measurement gratings are used for multi-point temperature measurement of an internal area of a galvanic pile to achieve temperature measurement with high spatial resolution, and the reference grating is aligned with a thermocouple probe and used for wavelength drift compensation to achieve dynamic calibration of temperature signals. And the problem of temperature measurement errors is effectively avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of solid oxide fuel cell, and particularly relates to a SOC stack temperature measurement system based on fiber grating array and a use method thereof. BACKGROUND

[0002] As a new type of electrochemical energy conversion device, solid oxide cell (SOC) has a wide application prospect in the field of clean energy conversion and storage due to its high energy conversion efficiency, no need for noble metal catalyst and strong fuel adaptability. The solid oxide electrolysis cell can realize efficient conversion of electrical energy into chemical energy in the form of hydrogen or synthetic gas, and the most prominent advantage of the solid oxide fuel cell is the bidirectional reversible operation characteristic: it can realize chemical energy storage in electrolysis mode, and can switch to fuel cell mode to output electrical energy, which meets the rigid demand of new power system for large-scale long-time energy storage and flexible load regulation.

[0003] In the solid oxide cell stack, the temperature distribution is a key parameter that determines the overall and local performance of the SOC stack. Uneven temperature distribution may cause local overheating of the stack, thermal expansion difference and mechanical fatigue, thereby causing thermal stress problems and affecting the reliability and durability of the stack. Therefore, accurately understanding the temperature distribution of the SOC stack under actual working conditions is crucial for improving the performance of the stack, analyzing the attenuation mechanism and prolonging the service life.

[0004] At present, in the temperature measurement technology for solid oxide cells, thermocouples are the most mature temperature measurement method, which has good stability and reliability, but may increase the possibility of gas leakage, and the spatial resolution of temperature measurement is low. The multi-channel temperature sensor array has high temporal and spatial resolution and little effect on the cell environment, but the arrangement of the sensor may damage the electrode structure and even cause the cell to crack. The infrared thermal imaging technology relies on non-contact measurement method and does not interfere with the SOC in-plane temperature field distribution, but its measurement error is large and the data stability is relatively poor. As a new temperature measurement technology, the optical fiber temperature sensing technology has high precision and excellent spatial resolution, and the reflection light sensing technology based on fiber Bragg grating is suitable for multi-point measurement in a small range and is suitable for multi-point temperature monitoring inside the SOC stack.

[0005] The existing Chinese patent with the publication number CN 113871663 B provides a high-temperature solid oxide fuel cell stack temperature measurement and positioning device. The working end of the three-degree-of-freedom Cartesian coordinate manipulator clamps the laser range finder to operate, laser scans the fuel cell stack gas duct, obtains distance data, and provides basis for rapid positioning of the temperature measurement sensor. Although the invention can measure the temperature of multiple points inside the stack along the flow channel, it cannot monitor the temperature changes of multiple points at the same time, and can only restore the steady-state temperature distribution inside the stack.

[0006] The existing Chinese patent with publication number CN 115483416 B provides a SOFC stack external temperature field test system and method. The patent technology ensures that the temperature measured by each temperature sensing point is synchronized with the stack temperature. By measuring the temperature data outside the stack and obtaining the temperature field, the external temperature field of the stack can be monitored in real time and online. It can also be used as an important basis and data support for detecting stack gas leakage, stack fault diagnosis and system evaluation. The defect of the prior art is that it can only measure the temperature outside the stack and cannot truly restore the temperature field inside the stack.

[0007] In summary, although these existing technologies have innovations in temperature measurement positioning, external temperature field monitoring, and multi-point temperature measurement layout, they all have the following problems:

[0008] 1. It is impossible to realize simultaneous real-time online monitoring of the internal multi-point temperature of the stack. Existing solutions can only reconstruct the steady-state temperature distribution and are difficult to capture dynamic temperature change processes.

[0009] 2. Some technologies can only measure the external temperature field of the stack, and cannot truly reflect the temperature distribution under actual working conditions inside the stack, limiting accurate analysis of local overheating and thermal stress.

[0010] 3. Some multi-point temperature measurement arrangements may interfere with the structural integrity of the stack, increase the risk of gas leakage or cause battery cracking, and affect the long-term stable operation of the stack.

[0011] 4. Existing non-contact temperature measurement methods (such as infrared thermal imaging) avoid structural interference, but have large measurement errors and poor stability, making it difficult to meet the precise monitoring requirements of high-temperature SOC. SUMMARY

[0012] In order to overcome or alleviate one or more of the above technical problems, the purpose of the present application is to provide a SOFC stack temperature measurement system based on a fiber grating array and a method for using the same. The system uses a fiber temperature sensor based on a fiber grating array for multi-point temperature measurement inside the stack. A reference grating and a thermocouple are provided in the design of the fiber structure to serve as a compensation reference for the wavelength drift of the fiber grating, achieving synchronous measurement and calibration of multi-point grating temperature measurement.

[0013] The present application provides the following technical solutions:

[0014] In one aspect, the application provides a SOC stack temperature measurement system based on a fiber grating array, which comprises a high-temperature furnace arranged outside a solid oxide stack to be measured, a plurality of array-arranged fiber temperature sensors inserted into the high-temperature furnace to measure the internal temperature of the solid oxide stack, an external fiber demodulator connected to the fiber temperature sensors, the fiber demodulator demodulating the wavelength signals transmitted by the fiber temperature sensors and uploading to an upper computer, and the upper computer processing the wavelength data and converting it into temperature data.

[0015] According to some embodiments, a single fiber temperature sensor comprises a fiber grating array for temperature measurement and a quartz optical fiber for transmitting temperature signals outward, and the fiber grating array comprises a plurality of temperature measurement gratings uniformly arranged in the solid oxide stack.

[0016] According to some embodiments, the solid oxide stack comprises stacked solid oxide cells, connecting bodies between the solid oxide cells, an upper end plate and a lower end plate, the solid oxide cells comprising a cell cathode, an electrolyte and a cell anode in sequence, the cell anode being connected to the anode flow channel of the connecting body, and the cell cathode being connected to the cathode flow channel of the connecting body; the temperature measurement gratings are arranged in the solid oxide stack in any one of the following ways:

[0017] Way one: a plate body between the anode flow channel and the cathode flow channel of the connecting body is provided with a plurality of holes corresponding to the number of temperature measurement gratings in the direction of gas flow, and the temperature measurement gratings are arranged in the holes;

[0018] Way two: the temperature measurement gratings are arranged in the cathode flow channel of the connecting body;

[0019] Way three: a plate body between the anode flow channel and the cathode flow channel of the connecting body is provided with a plurality of holes corresponding to the number of temperature measurement gratings in the direction perpendicular to the gas flow, and the temperature measurement gratings are arranged in the holes.

[0020] According to some embodiments, the application further comprises a thermocouple and a thermocouple temperature acquisition device connected to each other, the thermocouple temperature acquisition device being connected to the upper computer; the fiber grating array further comprises a reference grating arranged at the rear end of the temperature measurement grating, the temperature measurement grating being inserted into the solid oxide stack, i.e. into the hole of the connecting body or the cathode flow channel of the connecting body, for measuring the internal temperature of the solid oxide stack; the reference grating is arranged outside the solid oxide stack; the upper computer compares the temperature data collected by the reference grating with the temperature data collected by the thermocouple, calibrates the temperature of the reference grating, and uses it as a calibration reference for the temperature measurement grating to realize real-time calibration of the temperature measurement process.

[0021] According to some embodiments, the optical fiber temperature sensor and the thermocouple are fixed by a fixed sleeve, and a thermocouple probe of the thermocouple is located at the top of the package, and a reference grating of the optical fiber temperature sensor is aligned with the thermocouple probe.

[0022] According to some embodiments, the sleeve channel of the fixed sleeve has the same diameter as the optical fiber temperature sensor and the thermocouple.

[0023] According to some embodiments, a hole is formed in the sidewall of the high-temperature furnace, the optical fiber temperature sensor penetrates through the hole, and the hole is sealed and insulated by high-temperature insulation cotton.

[0024] According to some embodiments, the optical fiber temperature sensor further comprises a stainless steel armor.

[0025] In another aspect, the application also provides a use method of the above-mentioned SOC stack temperature measurement system based on the optical fiber grating array, and the steps comprise:

[0026] S1: The optical fiber temperature sensor and the thermocouple are placed in the fixed sleeve, the reference grating is aligned with the thermocouple probe, the thermocouple is connected to the thermocouple temperature acquisition device, the optical fiber temperature sensor is connected to the optical fiber demodulator, and the optical fiber demodulator is controlled by the upper computer.

[0027] S2: After the integrated optical fiber temperature sensor and the thermocouple penetrate through the hole in the sidewall of the high-temperature furnace, they are directly inserted into the hole of the connecting body or the cathode flow channel of the connecting body, and the temperature measurement grating is arranged in the target temperature measurement area inside the stack, and the reference grating and the thermocouple probe are arranged outside the stack.

[0028] S3: The hole of the high-temperature furnace is sealed with high-temperature insulation cotton, and then the solid oxide stack is heated to the working temperature and a stable working temperature environment is maintained.

[0029] S4: Each temperature measurement grating of the optical fiber temperature sensor transmits a wavelength signal to the upper computer through the optical fiber demodulator and converts it into a temperature signal, realizing multi-point temperature measurement inside the stack.

[0030] S5: The temperature signal obtained by the reference grating is compared with the temperature signal obtained by the thermocouple probe, the temperature calibration of the reference grating is performed, and the reference grating is used as the calibration reference of the temperature measurement grating, realizing real-time temperature calibration in the stack temperature measurement process.

[0031] Compared with the prior art, the application has the following beneficial effects:

[0032] (1) The application provides a SOC stack temperature measurement system based on a fiber grating array and a use method thereof, wherein a fiber temperature measurement grating array is arranged in a key area in a solid oxide stack to perform multipoint temperature measurement, a reference grating and a thermocouple comparison calibration mechanism are combined, multipoint temperature measurement and calibration are simultaneously performed, and the accuracy and long-term stability of stack internal temperature measurement are significantly improved.

[0033] (2) The application provides a SOC stack temperature measurement system based on a fiber grating array and a use method thereof, wherein high spatial resolution temperature measurement based on a fiber grating array can monitor the internal thermal distribution state of the stack in real time, assist in gas flow control and thermal management, avoid structural damage caused by thermal stress concentration and local overheating, thereby prolonging the service life of the stack, and improving the reliability and durability of the stack.

[0034] (3) The application provides a SOC stack temperature measurement system based on a fiber grating array and a use method thereof, wherein the structural design of the system has good compatibility and repeatability. The fiber sensor and the thermocouple are integrated in a modular design, which is suitable for solid oxide stacks with internal manifold or external manifold gas distribution structures, and the installation mode is flexible, that is, the fiber sensor and the thermocouple can be embedded in the connecting body or attached to the surface of the battery cathode without damaging the air tightness and structural integrity of the stack. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 A SOC stack temperature measurement system based on a fiber grating array is provided for the embodiment of the application.

[0036] Figure 2 A fiber grating array SOC stack temperature measurement structure with longitudinal arrangement of connecting body openings is provided for the embodiment of the application.

[0037] Figure 3 A fiber temperature sensor and a thermocouple arrangement diagram is provided for the embodiment of the application.

[0038] Figure 4 A fiber grating array SOC stack temperature measurement structure with longitudinal arrangement of connecting body openings is provided for the embodiment of the application.

[0039] Figure 5 A fiber grating array SOC stack temperature measurement structure with longitudinal arrangement of connecting body openings is provided for the embodiment of the application.

[0040] In the figure:

[0041] 1-Fiber optic temperature sensor; 2-Thermocouple; 3-Fixed sleeve; 4-Battery cathode; 5-Electrolyte; 6-Battery anode; 7-Connector; 8-Upper end plate; 9-Lower end plate; 10-Temperature measuring grating; 11-Reference grating; 12-Thermocouple measuring point; 13-Solid oxide fuel cell stack; 14-Fiber optic demodulator; 15-Thermocouple temperature acquisition device; 16-Host computer; 17-High temperature furnace. Detailed Implementation

[0042] The present invention will now be described in detail with reference to embodiments and accompanying drawings. However, it should be understood that the embodiments and drawings are for illustrative purposes only and do not constitute any limitation on the scope of protection of the present invention. All reasonable modifications and combinations included within the inventive spirit of the present invention fall within the scope of protection of the present invention.

[0043] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "front," and "rear," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication of two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0044] The present invention will be further described below with reference to the accompanying drawings.

[0045] Example 1

[0046] like Figure 1 As shown, the SOC stack temperature measurement system based on fiber optic grating array provided in this embodiment includes a solid oxide stack 13, an optical fiber temperature sensor 1, a thermocouple 2, a fixed sleeve 3, a high-temperature furnace 17, a thermocouple temperature acquisition device 15, an optical fiber demodulator 14, and a host computer 16.

[0047] like Figure 2As shown, the solid oxide cell stack 13 includes a solid oxide cell, a connecting body 7, an upper end plate 8 and a lower end plate 9, the solid oxide cell includes a cell cathode 4, an electrolyte 5 and a cell anode 6 in sequence, the cell anode 6 is connected with an anode flow channel of the connecting body 7, the cell cathode 4 is connected with a cathode flow channel of the connecting body 7, and the connecting body 7 is provided with a small hole in the plate body between the anode flow channel and the cathode flow channel.

[0048] As shown in the figure, Figure 3 As shown, the fiber temperature sensor 1 includes a quartz optical fiber, a fiber grating array and a stainless steel armor, the fiber grating array is divided into a temperature measuring grating 10 and a reference grating 11. The fixed sleeve 3 fixes the fiber temperature sensor 1 and the thermocouple 2, and the reference grating 11 of the fiber temperature sensor 1 is aligned with the thermocouple probe 12 of the thermocouple 2.

[0049] The fiber temperature sensor 1 is directly inserted into the small hole of the connecting body 7 and arranged along the direction of gas flow, the temperature measuring grating 10 is placed inside the solid oxide cell stack 13 and used for temperature measurement inside the cell stack, and the reference grating 11 is placed outside the solid oxide cell stack 13 and used as a calibration reference for the temperature measuring grating 10 by comparing the temperature with the thermocouple 2, so as to realize real-time calibration of the temperature measurement process.

[0050] The high-temperature furnace 17 is used for maintaining the high-temperature working environment of the solid oxide cell stack 13, the thermocouple temperature acquisition device 15 can simultaneously acquire temperature signals of multiple thermocouples 2, the fiber demodulator 14 has a plurality of demodulation channels and can simultaneously demodulate wavelength signals of multiple fiber temperature sensors 1, the fiber demodulator 14 acquires wavelength signals reflected by the temperature measuring grating 10 and the reference grating 11, processes the wavelength signals and uploads them to the upper computer 16, and the upper computer 16 processes the wavelength data and converts them into temperature data for display.

[0051] Each connecting body 7 is provided with five small holes, and the fiber temperature sensor 1 is provided with five temperature measuring gratings 10 and one reference grating 11, as shown in the figure, Figure 3 Each temperature measuring plane can achieve twenty-five temperature measuring points, so as to realize high spatial resolution temperature measurement. The thermocouple probe 12 of the thermocouple 2 is located at the top of the package and aligned with the reference grating 11 of the fiber temperature sensor 1, and used for real-time calibration in the temperature measurement process of the fiber temperature sensor 1.

[0052] The fixed sleeve 3 is provided with a through channel for placing the fiber temperature sensor 1 and the thermocouple 2, and the diameters of the channels are the same as the packaging diameters of the fiber temperature sensor 1 and the thermocouple 2. The sidewall of the high-temperature furnace 17 is provided with a hole for arranging the fiber sensor 1 and the thermocouple 2 into the cell stack, and high-temperature heat insulation cotton is used to seal and insulate the hole.

[0053] The embodiment also provides a use method of the SOC cell stack temperature measurement system based on the fiber grating array, and the steps are as follows:

[0054] S1: Place the fiber optic temperature sensor 1 and the thermocouple 2 in the fixed sleeve 3, align the reference grating 11 of the fiber optic temperature sensor 1 with the thermocouple probe 12 of the thermocouple 2, connect the thermocouple 2 to the thermocouple temperature acquisition device 15, connect the fiber optic temperature sensor 1 to the fiber optic demodulator 14, and control the fiber optic demodulator 14 through the host computer 16.

[0055] S2: After the integrated fiber optic temperature sensor 1 and thermocouple 2 pass through the hole in the side wall of the high-temperature furnace 17, they are directly inserted into the small hole of the connector 7 of the solid oxide fuel cell 13. The temperature measuring grating 10 of the fiber optic sensor 1 is arranged in the target temperature measuring area inside the solid oxide fuel cell 13, and the reference grating 11 and thermocouple probe 12 are placed outside the solid oxide fuel cell 13.

[0056] S3: Seal the holes of the high-temperature furnace 17 with high-temperature insulation cotton, then heat the solid oxide fuel cell 13 to the working temperature and maintain a stable working temperature environment.

[0057] S4: The multiple temperature measuring gratings 10 of the fiber optic temperature sensor 1 transmit the wavelength signal to the host computer 16 through the fiber optic demodulator 14 and convert it into a temperature signal to realize multi-point temperature measurement inside the fuel cell stack.

[0058] S5: The temperature signal obtained by the reference grating 11 of the fiber optic temperature sensor 1 is compared with the temperature signal obtained by the thermocouple probe 12 of the thermocouple 2 to perform temperature calibration of the reference grating 11, and use it as a calibration reference for the temperature measuring grating 10 to realize real-time temperature calibration of the fuel cell stack temperature measurement process.

[0059] Example 2

[0060] like Figure 4 As shown, the connector 7 of the solid oxide fuel cell stack 13 does not have a small hole. The fiber optic temperature sensor 1 is directly arranged in the cathode flow channel of the connector 7, closer to the surface of the battery cathode 4. The temperature measurement is closer to the actual temperature of the battery surface. Moreover, it is installed on the side of the battery cathode 4, where the gas is air. The airtightness requirement is not high, and the installation of the fiber optic temperature sensor 1 has little impact on the solid oxide fuel cell stack 13. The other related technical solutions are the same as in Embodiment 1, and will not be described again here.

[0061] Example 3

[0062] like Figure 5 As shown, the connector 7 of the solid oxide fuel cell 13 has a small hole perpendicular to the airflow direction. Therefore, the fiber optic temperature sensor 1 is arranged perpendicular to the gas flow direction. This arrangement is more suitable for the external manifold structure of the solid oxide fuel cell 13. Arranging the fiber optic temperature sensor 1 perpendicular to the airflow direction will not affect the fuel cell manifold structure or airtightness. The other related technical solutions are the same as in Embodiment 1, and will not be described again here.

[0063] The above embodiments are only preferred embodiments of the present application, and the protection scope of the present application is not limited to the above embodiments. Any technical scheme falling within the concept of the present application belongs to the protection scope of the present application. It should be pointed out that improvements and refinements made by those of ordinary skill in the art without departing from the principles of the present application should also be considered as falling within the protection scope of the present application.

Claims

1. A temperature measurement system for a SOC (System-on-a-Chip) fuel cell based on a fiber Bragg grating array, characterized in that: It includes a high-temperature furnace located outside the solid oxide fuel cell stack under test, multiple arrayed fiber optic temperature sensors inserted into the high-temperature furnace to measure the internal temperature of the solid oxide fuel cell stack, the fiber optic temperature sensors being externally connected to a fiber optic demodulator, the fiber optic demodulator demodulating the wavelength signal transmitted by the fiber optic temperature sensors and uploading it to a host computer, the host computer processing the wavelength data and converting it into temperature data.

2. The SOC stack temperature measurement system based on fiber Bragg grating array according to claim 1, characterized in that: Each fiber optic temperature sensor includes a fiber optic grating array for temperature measurement and a quartz fiber for transmitting temperature signals outward. The fiber optic grating array includes multiple temperature-sensing gratings, which are uniformly arranged within the solid oxide fuel cell.

3. The SOC stack temperature measurement system based on fiber Bragg grating array according to claim 2, characterized in that: The solid oxide fuel cell stack includes stacked solid oxide batteries, connectors between the solid oxide batteries, an upper end plate, and a lower end plate. Each solid oxide battery sequentially includes a cathode, an electrolyte, and an anode. The anode is connected to the anode channel of the connector, and the cathode is connected to the cathode channel of the connector. The temperature-sensing grating is disposed throughout the solid oxide fuel cell stack, and the penetration method is any of the following: Method 1: The plate between the anode flow channel and the cathode flow channel of the connector is provided with a plurality of channels corresponding to the number of temperature measuring gratings through it along the gas flow direction, and the temperature measuring gratings are inserted into the channels; Method 2: The temperature-measuring optical fiber is inserted into the cathode flow channel of the connector; Method 3: The plate between the anode flow channel and the cathode flow channel of the connector is provided with a plurality of channels corresponding to the number of temperature measuring gratings through it along the direction perpendicular to the gas flow, and the temperature measuring gratings are inserted in the channels.

4. The SOC stack temperature measurement system based on fiber Bragg grating array according to claim 3, characterized in that: It also includes thermocouples and thermocouple temperature acquisition devices connected to each other, the thermocouple temperature acquisition devices being connected to the host computer; the fiber optic grating array also includes a reference grating disposed at the rear end of the temperature-sensing grating, the temperature-sensing grating being inserted into the solid oxide fuel cell, that is, inserted into the channel of the connector or the cathode flow channel of the connector, for measuring the temperature inside the solid oxide fuel cell; the reference grating is placed outside the solid oxide fuel cell; the host computer compares the temperature data acquired by the reference grating with the temperature data acquired by the thermocouples, performs temperature calibration of the reference grating, and uses it as a calibration reference for the temperature-sensing grating, realizing real-time calibration of the temperature measurement process.

5. The SOC stack temperature measurement system based on fiber Bragg grating array according to claim 4, characterized in that: The fiber optic temperature sensor and the thermocouple are respectively fixed by a fixed sleeve, with the thermocouple probe of the thermocouple located at the top of the package, and the reference grating of the fiber optic temperature sensor aligned with the thermocouple probe of the thermocouple.

6. The SOC stack temperature measurement system based on fiber Bragg grating array according to claim 5, characterized in that: The mounting channel of the fixed sleeve is the same size as the encapsulation diameter of the fiber optic temperature sensor and the thermocouple.

7. The SOC stack temperature measurement system based on fiber Bragg grating array according to claim 1, characterized in that: The high-temperature furnace has holes in its side wall, through which the fiber optic temperature sensor passes, and the holes are sealed and insulated with high-temperature insulation cotton.

8. The SOC stack temperature measurement system based on fiber Bragg grating array according to claim 7, characterized in that: The fiber optic temperature sensor also includes stainless steel armor.

9. A method of using the SOC stack temperature measurement system based on a fiber Bragg grating array according to any one of claims 5-8, characterized in that, The steps include: S1: Place the fiber optic temperature sensor and the thermocouple in the fixed sleeve, align the reference grating with the thermocouple probe of the thermocouple, connect the thermocouple to the thermocouple temperature acquisition device, connect the fiber optic temperature sensor to the fiber optic demodulator, and control the fiber optic demodulator through the host computer. S2: After the integrated fiber optic temperature sensor and thermocouple are passed through the hole in the side wall of the high-temperature furnace, they are directly inserted into the channel of the connector or the cathode flow channel of the connector, and the temperature measuring grating is arranged in the target temperature measuring area inside the fuel cell stack, while the reference grating and thermocouple probe are placed outside the fuel cell stack. S3: Seal the holes of the high-temperature furnace with high-temperature insulation cotton, then heat the solid oxide fuel cell to the working temperature and maintain a stable working temperature environment. S4: Each of the temperature-measuring gratings of the fiber optic temperature sensor transmits the wavelength signal to the host computer through the fiber optic demodulator and converts it into a temperature signal to realize multi-point temperature measurement inside the fuel cell stack. S5: The temperature signal obtained through the reference grating is compared with the temperature signal obtained by the thermocouple probe of the thermocouple to perform temperature calibration of the reference grating, and it is used as the calibration reference for the temperature measuring grating to realize real-time temperature calibration of the fuel cell stack temperature measurement process.

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