Electrolytic tank test conversion system for solid oxide fuel cell

Abstract

The utility model relates to the field of fuel cells, and discloses an electrolytic tank test conversion system for a solid oxide fuel cell, which comprises an SOFC-SOEC electric pile comprising at least one solid oxide fuel cell unit; the gas supply system comprises a fuel gas supply assembly, an oxidant gas supply assembly and a purging gas supply assembly which are connected with the electric pile; the water supply system is communicated with the electric pile; the temperature control system comprises a high-temperature furnace, a heating element and a temperature sensor, the galvanic pile is installed in the high-temperature furnace, the heating element is arranged between the galvanic pile and a pipeline communicated with the gas supply system and the water supply system, and the temperature sensor is used for measuring the temperature needed by work of the galvanic pile; and a security management and control system. The electrolytic tank test conversion system can quickly switch between an SOFC power generation mode and an SOEC electrolysis mode, and solves the limitation problem that only the SOFC or the SOEC can be tested independently in the prior art.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of fuel cell, especially a solid oxide fuel cell electrolytic cell test conversion system. BACKGROUND

[0002] Solid oxide fuel cell (SOFC) is a device that can switch between fuel cell mode (power generation mode) and electrolytic cell mode (electrolysis mode), with the ability of bidirectional operation. In fuel cell mode, SOFC can directly convert chemical energy into electrical energy; while in electrolytic cell mode, it can drive chemical reactions through electrical energy to generate hydrogen and oxygen. Due to its advantages in energy storage, conversion and renewable energy utilization, SOFC has great potential in the field of new energy technology.

[0003] Solid oxide fuel cell test bench is a key tool for evaluating SOFC and its stack performance, its main functions include:

[0004] 1. Performance evaluation: test bench can test the performance of SOFC single cell or stack under different operating conditions, such as voltage-current characteristics, power output, etc., to evaluate its work efficiency.

[0005] 2. Stability and durability test: through long-term experiment, evaluate the stability and durability of SOFC system under long-term operation, including material aging, performance attenuation, etc.

[0006] 3. Environmental adaptability test: by simulating different environmental conditions such as temperature and humidity, test the adaptability and stability of SOFC under environmental changes.

[0007] 4. Fuel flexibility analysis: test the adaptability of SOFC to different types of fuel (such as hydrogen, methane, biomass gas, etc.) and its conversion efficiency, to help determine the best fuel selection.

[0008] 5. Control strategy development and verification: develop and verify the control strategy of SOFC system to ensure its efficient and safe operation, including power output adjustment, load change management, etc.

[0009] But the test bench in the prior art can usually only test the SOFC power generation performance, or only test the SOEC electrolysis performance, or integrate the test SOFC power generation performance test bench and the test SOEC electrolysis performance test bench together, which leads to the problem of slow switching. UTILITY MODEL CONTENT

[0010] Based on this, in order to cope with these limitations, the utility model discloses a solid oxide fuel cell electrolytic cell test conversion system aims at solving the restriction that only SOFC or SOEC can be tested in prior art. The electrolytic cell test conversion system adds electrolytic cell mode when testing SOFC power generation performance, realizes the bidirectional operation of SOFC and electrolytic cell, can test the power generation performance of SOFC and the electrolysis performance of SOEC simultaneously, realizes the quick switching of power generation mode and electrolysis mode through software control, increases gas supply for providing water vapor under electrolysis mode, aims at supporting the operation of solid oxide fuel cell (SOFC) mode and solid oxide electrolytic cell (SOEC) mode simultaneously, this multifunctionality makes SOFC-EC test conversion system become the ideal platform for researching new materials, optimizing system design and exploring high-efficiency energy conversion technology, and the system does not need to be reconfigured. The electrolytic cell test conversion system through automation control and flexible hardware design not only reduces switching time, but also improves test efficiency and accuracy, and reduces experimental cost.

[0011] A solid oxide fuel cell electrolytic cell test conversion system, comprising:

[0012] A SOFC-SOEC stack comprising at least one solid oxide fuel cell (SOFC) unit, the SOFC unit being used for chemical energy to electrical energy conversion or electrolytic hydrogen production;

[0013] A gas supply system comprising a fuel gas supply assembly, an oxidant gas supply assembly and a purge gas supply assembly connected to the SOFC-SOEC stack;

[0014] A water supply system connected to the SOFC-SOEC stack for supplying deionized water to the SOFC-SOEC stack when generating hydrogen by electrolyzing water in SOFC power generation mode;

[0015] A temperature control system comprising a high-temperature furnace, a heating element and a temperature sensor, the SOFC-SOEC stack is installed in the high-temperature furnace, the heating element is arranged between the SOFC-SOEC stack and the pipeline connected to the gas supply system and the water supply system, and the temperature sensor is used to measure the temperature required for the operation of the SOFC-SOEC stack;

[0016] A safety control system connected to the SOFC-SOEC stack, comprising an electrochemical workstation for power management and a data acquisition system for real-time recording, monitoring and adjusting the operating parameters of the SOFC-SOEC stack.

[0017] As a further scheme of the utility model, the SOFC-SOEC electric pile includes one or more SOFC units, and has two working modes of SOFC mode and SOEC mode.

[0018] As a further scheme of the utility model, in the SOFC mode, the cell stack of the solid oxide fuel cell unit generates electric energy through the chemical reaction of fuel gas and oxidant gas; in the SOEC mode, the stack is used for electrolyzing water to generate hydrogen.

[0019] As a further scheme of the utility model, the fuel gas supply assembly includes a fuel gas cylinder, a fuel gas flowmeter, a one-way valve I, a flame arrestor and an automatic valve I, the fuel gas cylinder is sequentially provided with the fuel gas flowmeter, the one-way valve I, the flame arrestor and the automatic valve I on the output pipeline, is used for providing fuel gas for the SOFC stack, and the fuel gas is hydrogen or methane.

[0020] As a further scheme of the utility model, the oxidant gas supply assembly includes an air compressor, an air flowmeter, a one-way valve II and an automatic valve II, the air compressor is communicated with the SOFC-SOEC electric pile through an oxidant gas pipeline, the air flowmeter, the one-way valve II and the automatic valve II are sequentially installed on the oxidant gas pipeline of the output end of the air compressor, are used for providing oxidant gas for the SOFC stack of the SOFC-SOEC electric pile, and the oxidant gas is air.

[0021] As a further scheme of the utility model, the purge gas supply assembly includes a nitrogen cylinder, a nitrogen flowmeter, a one-way valve III, an automatic valve III and a three-way valve I, is used for providing nitrogen for purging and preventing gas leakage.

[0022] As a further scheme of the utility model, the water supply system includes a deionized water tank, a metering pump and an automatic on-off valve, the deionized water tank is adjusted by the metering pump and the automatic on-off valve installed on the pipeline.

[0023] As a further scheme of the utility model, the automatic valve I in the fuel gas supply assembly is communicated with the three-way valve I of the purge gas supply assembly, the three-way valve I is communicated with the automatic on-off valve of the water supply system through the three-way valve II installed on the pipeline, and the three-way valve II is also communicated with the SOFC-SOEC electric pile through a pipeline.

[0024] As a further scheme of the utility model, the SOFC-SOEC electric pile is installed in the high-temperature furnace of the temperature control system through the support, the heating element is the spring heater heat tracing pipeline connected with the automatic valve II and the SOFC-SOEC electric pile, the temperature sensor is installed at the anode, cathode and electrolyte position of the SOFC-SOEC electric pile, and the high-temperature furnace and heating element of the temperature control system are used to provide the working temperature of 600 DEG C to 1000 DEG C for the SOFC-SOEC electric pile in the SOFC power generation mode and SOEC electrolysis mode.

[0025] As a further scheme of the utility model, the water vapor generator, automatic valve IV and spring heater heat tracing pipeline are further installed between the three-way valve II and the SOFC-SOEC electric pile, the air outlet pipeline, gas washing bottle and fuel gas outlet pipeline are further connected to the SOFC-SOEC electric pile, the air outlet pipeline is used to discharge the excess oxidizing gas provided by the air compressor in the oxidizing gas supply assembly, the gas washing bottle is used to collect the excess liquid when the purge gas supply assembly is purged, and the fuel gas outlet pipeline is used to discharge the excess gas when the purge gas supply assembly is purged and the excess fuel gas input by the fuel gas cylinder in the fuel gas supply assembly.

[0026] As a further scheme of the utility model, the safety control system further includes a power-off protection unit for over-temperature protection, over-voltage protection and short-circuit protection, and is used to execute over-temperature protection, over-voltage protection and short-circuit protection, and ensure the safety of the test process.

[0027] Compared with the prior art, the solid oxide fuel cell electrolysis cell test conversion system has the following beneficial effects:

[0028] 1. The test conversion system can realize the quick switching between the SOFC power generation mode and SOEC electrolysis mode, and the switching time is not more than 30 minutes, and the high-efficiency switching capacity greatly improves the experimental test efficiency, and is especially suitable for research and development work requiring frequent switching of working mode.

[0029] 2.The test conversion system of the utility model through perfect gas supply system, including fuel gas, oxidant gas and purge gas supply assembly, can switch flexibly according to the need, ensures providing hydrogen, air and other gases under SOFC power generation mode, and provides moisture under SOEC electrolysis mode to support water electrolysis process.Moreover, the gas flow, pressure and other parameters can be accurately controlled, which ensures the stability and accuracy of gas supply.In addition, the water supply system provides accurate water flow regulation, which ensures the water supply required by the electrolysis reaction under SOEC mode, effectively improving the efficiency of electrolytic hydrogen.

[0030] 3.The utility model discloses a temperature control system, including high temperature furnace and accurate temperature control unit, can accurately adjust the working temperature of SOFC-SOEC electric pile.Through high temperature furnace, can provide stable working temperature (600 DEG C to 1000 DEG C) for electric pile, and through temperature control unit, real-time monitoring temperature change, avoids the electric pile performance unstable or breakdown due to temperature fluctuation.The heat in high temperature furnace is evenly distributed, which ensures that the electric pile can reach the required temperature environment during operation, thereby improving the working efficiency and service life of the electric pile.

[0031] 4.The utility model discloses a bench equipped with data acquisition and monitoring system, including temperature, voltage, current, gas flow and multiple sensors, can real-time monitoring the working state of electric pile and records relevant data, realizes the accuracy of data acquisition and monitoring system.In addition, it is also equipped with all-round safety protection system, including overtemperature, overvoltage, hydrogen leakage and multiple protection measures, ensures the safe operation of electric pile and gas system during the experiment.In the case of abnormal situation, the system can automatically cut off the power, stop the gas supply or start other safety measures, effectively prevent accidents, protect the safety of experimenters.

[0032] 5.The utility model discloses a bench adopts modular design, so that each system component can be independently replaced or upgraded according to experimental requirements, not only improves the flexibility of the equipment, but also facilitates the maintenance and upgrading of the system, reduces the equipment failure rate, prolongs the service life of the equipment.In addition, the test conversion system of the utility model can provide stable and accurate test environment.Through automatic adjustment system and precise sensor monitoring, the performance of the electric pile can be optimized under different working modes.Especially for the performance test and optimization process of solid oxide fuel cell and electrolytic cell, it can provide more real and reliable data support, which helps to accelerate the research and product development process.

[0033] 6.The test bench of the utility model reduces manual intervention and operation difficulty, realizes automatic adjustment of various test parameters, reduces complexity and failure rate of manual operation, especially in the switching process of SOFC and SOEC working modes, the system automatically completes adjustment of parameters such as gas, temperature and moisture, reduces human operation interference, and improves experimental repeatability and stability.

[0034] In summary, the solid oxide fuel cell electrolysis cell test conversion system of the utility model has significant advantages in multiple aspects, including efficient working mode switching capability, precise gas and moisture supply system, optimized temperature control system, accurate data acquisition and monitoring, comprehensive safety guarantee and modular design, etc.These advantages enable the electrolysis cell test conversion system to significantly improve the efficiency, accuracy and safety of solid oxide fuel cell and electrolysis cell testing, suitable for laboratory research, technical development and large-scale testing, etc., with high practical value and application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced below, obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can obtain other drawings according to these drawings without creating creative labor.

[0036] Among them:

[0037] Figure 1 It is a structural schematic diagram of the solid oxide fuel cell electrolysis cell test conversion system of the embodiment of the utility model.

[0038] Figure 2 It is a SOFC test result diagram of the solid oxide fuel cell electrolysis cell test conversion system of the embodiment of the utility model.

[0039] Figure 3 It is a SOEC test result flow chart of the solid oxide fuel cell electrolysis cell test conversion system of the embodiment of the utility model.

[0040] Reference signs:

[0041] 1-fuel gas cylinder, 2-fuel gas flow meter, 3-check valve I, 4-choke, 5-automatic valve I, 6-nitrogen cylinder, 7-nitrogen flow meter, 8-check valve III, 9-automatic valve III, 10-three-way valve I, 11-deionized water tank, 12-metering pump, 13-automatic on-off valve, 14-three-way valve II, 15-air compressor, 16-air flow meter, 17-check valve II, 18-automatic valve II, 19-steam generator, 20-automatic valve IV, 21-spring heater heat tracing pipeline, 22-high temperature furnace, 23-SOFC-SOEC stack, 24-electrochemical workstation, 25-air outlet pipeline, 26-gas washing cylinder, 27-fuel gas outlet pipeline. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0043] The test bench of the prior art can only test the power generation performance of SOFC. The present application provides an electrolytic cell test conversion system for solid oxide fuel cells, which realizes bidirectional operation of SOFC and electrolytic cell by adding the function of electrolytic cell mode, adds a steam generator for providing steam in electrolytic mode, adds an electrochemical workstation to provide the power supply required by the electrolytic mode and the electronic load of the power generation mode, and adds the functions of monitoring and recording parameters. The electrolytic cell test conversion system can realize rapid switching between SOFC power generation mode and SOEC electrolysis mode through at least one solid oxide fuel cell (SOFC) unit provided by the SOFC-SOEC stack 23, without the need to reconfigure the system. The electrolytic cell test conversion system, through automatic control and flexible hardware design, not only reduces the switching time, but also improves the test efficiency and accuracy and reduces the experimental cost.

[0044] Referring to Figure 1 The embodiments of the present application provide an electrolytic cell test conversion system for solid oxide fuel cells, which includes a SOFC-SOEC stack 23, a gas supply system, a water supply system, a temperature control system and a safety control system.

[0045] Referring to Figure 1As shown, the SOFC-SOEC stack 23 comprises at least one solid oxide fuel cell (SOFC) unit for chemical energy to electrical energy conversion or electrolytic hydrogen production, and the SOFC-SOEC stack 23 is used for switching between SOFC power generation mode and SOEC electrolysis mode, and can simultaneously support the operation of solid oxide fuel cell (SOFC) mode and solid oxide electrolysis cell (SOEC) mode. In this embodiment, the SOFC-SOEC stack 23 includes a plurality of solid oxide fuel cell units, which has both SOFC mode and SOEC mode, for chemical energy to electrical energy conversion or electrolytic hydrogen production. In SOFC mode, the cell stack of the solid oxide fuel cell unit generates electrical energy through the chemical reaction of fuel gas and oxidant gas; in SOEC mode, the stack is used for electrolysis of water to produce hydrogen.

[0046] Referring to Figure 1 As shown, the gas supply system includes a fuel gas supply assembly, an oxidant gas supply assembly and a purge gas supply assembly connected to the SOFC-SOEC stack 23, for controlling the gas flow and supply mode when switching between SOFC power generation mode and SOEC electrolysis mode; wherein:

[0047] The fuel gas supply assembly includes a fuel gas cylinder 1, a fuel gas flowmeter 2, a one-way valve I 3, a flame arrester 4 and an automatic valve I 5, and the fuel gas cylinder 1 is sequentially provided with the fuel gas flowmeter 2, the one-way valve I 3, the flame arrester 4 and the automatic valve I 5 on the output pipeline, for providing fuel gas to the SOFC stack, and the fuel gas is hydrogen or methane.

[0048] The oxidant gas supply assembly includes an air compressor 15, an air flowmeter 16, a one-way valve II 17 and an automatic valve II 18, and the air compressor 15 is connected to the SOFC-SOEC stack 23 through an oxidant gas pipeline, and the air compressor 15 is sequentially provided with the air flowmeter 16, the one-way valve II 17 and the automatic valve II 18 on the oxidant gas pipeline at the output end, for providing oxidant gas to the SOFC stack of the SOFC-SOEC stack 23, and the oxidant gas is air.

[0049] The purge gas supply assembly includes a nitrogen cylinder 6, a nitrogen flowmeter 7, a one-way valve III 8, an automatic valve III 9 and a three-way valve I 10, for providing nitrogen for purging and preventing gas leakage.

[0050] In the embodiment, the automatic valve I 5 in the fuel gas supply assembly is communicated with the three-way valve I 10 of the purge gas supply assembly, the three-way valve I 10 is communicated with the automatic on-off valve 13 of the water supply system through the three-way valve II 14 installed on the pipeline, and the three-way valve II 14 is also communicated with the SOFC-SOEC stack 23 through the pipeline.

[0051] The test conversion system of the utility model can flexibly switch according to needs, ensures that hydrogen, air and other gases are provided in the SOFC power generation mode, and water is provided in the SOEC electrolysis mode to support the water electrolysis process. Moreover, the gas flow, pressure and other parameters can be accurately controlled, ensuring the stability and accuracy of the gas supply. In addition, the water supply system provides accurate water flow regulation, ensuring the water supply required by the electrolysis reaction in the SOEC mode, effectively improving the efficiency of the electrolytic hydrogen.

[0052] Referring to Figure 1 The water supply system is communicated with the SOFC-SOEC stack 23, and is used for supplying deionized water to the SOFC-SOEC stack 23 when hydrogen is generated by electrolyzing water in the SOFC power generation mode. In the embodiment, the water supply system comprises a deionized water tank 11, a metering pump 12 and an automatic on-off valve 13, and the deionized water tank 11 adjusts the water flow through the metering pump 12 and the automatic on-off valve 13 installed on the pipeline.

[0053] Referring to Figure 1 The temperature control system comprises a high-temperature furnace 22, a heating element and a temperature sensor, the SOFC-SOEC stack is installed in the high-temperature furnace, the heating element is arranged between the SOFC-SOEC stack and the pipeline communicated with the gas supply system and the water supply system, the temperature sensor is used for measuring the temperature required by the SOFC-SOEC stack to work, and the temperature control system can keep the temperature required by the SOFC-SOEC stack 23 to work in the SOFC power generation mode and the SOEC electrolysis mode, and adjust the temperature.

[0054] In the embodiment, the SOFC-SOEC stack 23 is installed in the high-temperature furnace 22 of the temperature control system through a support, the heating element is a spring heater tracing pipeline 21 communicated with the automatic valve II 18 and the SOFC-SOEC stack 23, the temperature sensor is installed at the anode, the cathode and the electrolyte position of the SOFC-SOEC stack 23, and the high-temperature furnace 22 and the heating element of the temperature control system are used for providing the working temperature of 600 DEG C to 1000 DEG C for the SOFC-SOEC stack 23 in the SOFC power generation mode and the SOEC electrolysis mode.

[0055] The utility model discloses a temperature control system, including high temperature furnace 22 and accurate temperature control unit, can accurate adjustment SOFC-SOEC electric pile 23's working temperature, through high temperature furnace 22, can provide stable working temperature (600 DEG C to 1000 DEG C) for electric pile, and through temperature control unit real time monitoring temperature change, avoid because temperature fluctuation leads to electric pile performance unstable or breakdown. The heat of high temperature furnace 22 is evenly distributed, ensure that the electric pile can reach the required temperature environment in the working process, thereby improve the working efficiency and service life of electric pile.

[0056] Referring to Figure 1 As shown in the figure, in the embodiment, a water vapor generator 19, an automatic valve IV 20 and a spring heater heat tracing pipeline 21 are further installed between the three-way valve II 14 and the SOFC-SOEC electric pile 23, the SOFC-SOEC electric pile 23 is further connected with an air outlet pipeline 25, a gas washing bottle 26 and a fuel gas outlet pipeline 27, the air outlet pipeline 25 is used to discharge the excess oxidizing gas provided by the air compressor 15 in the oxidizing gas supply assembly; the gas washing bottle 26 is used to collect the excess liquid during the purging of the purging gas supply assembly, and the fuel gas outlet pipeline 27 is used to discharge the excess gas during the purging of the purging gas supply assembly and the excess fuel gas input by the fuel gas cylinder 1 in the fuel gas supply assembly.

[0057] In the embodiment, the steps of testing the solid oxide fuel cell electrolysis cell test conversion system are as follows:

[0058] (1) SOFC mode start (fuel cell power generation):

[0059] Ensure that the SOFC-SOEC electric pile 23 has been installed in the high temperature furnace 22, and all temperature control devices (such as heating elements) have been connected.

[0060] Start the fuel gas supply system to ensure that hydrogen or methane is supplied to the SOFC stack and the gas flow is adjusted by the automatic valve I 5.

[0061] Start the oxidizing gas supply system (air compressor 15) to ensure that oxygen or air flow enters the SOFC stack. At this time, the SOFC stack generates electric energy through the chemical reaction of oxidizing agent and fuel.

[0062] Use the electrochemical workstation 24 to monitor the voltage, current and temperature of the SOFC-SOEC electric pile 23 in real time to ensure that it operates stably within the set range.

[0063] Record the electric energy output by the system to evaluate the power generation efficiency of the SOFC.

[0064] (2) SOEC mode start (electrolysis of water to produce hydrogen):

[0065] Switch to SOEC mode, close the fuel gas supply system, stop the supply of fuel.

[0066] Start the water supply system, ensure that the deionized water is accurately supplied to the SOFC-SOEC stack 23 by the metering pump 12.

[0067] Adjust the connection between the automatic valve I 5 and the three-way valve I 10 in the gas supply system, control the flow of nitrogen, and ensure the supply of water vapor in the electrolysis mode of the stack.

[0068] Start the oxidant gas supply system, adjust the air flow, and ensure that oxygen is used as an oxidant during electrolysis.

[0069] Adjust the high-temperature furnace 22 through the temperature control system to ensure that the stack operates at a temperature of 600-1000℃ and remains stable.

[0070] Record the current and voltage in the stack, monitor the output of hydrogen, and evaluate the electrolysis efficiency of SOEC.

[0071] Among them, the mode switching is the switching between SOFC mode and SOEC mode, and during the switching process, the switching of the fuel gas and oxidant gas supply components is smooth, and the switching of the water flow system and the gas flow is not conflicting. All system pressure, flow and temperature parameters need to be checked and calibrated before and after switching to ensure that the equipment can safely and stably switch between modes.

[0072] Referring to Figure 1 The safety control system is connected to the SOFC-SOEC stack 23, including an electrochemical workstation 24 for power management and a data acquisition system for real-time recording, monitoring and adjusting the operating parameters of the SOFC-SOEC stack 23. In this embodiment, the safety control system also includes a power-off protection unit for over-temperature protection, over-voltage protection and short-circuit protection, which is used to perform over-temperature protection, over-voltage protection and short-circuit protection to ensure the safety of the test process.

[0073] The safety management system is used for real-time monitoring and recording various parameters in the SOFC operation process, such as voltage, current, temperature, gas flow and the like, including over-temperature protection, over-voltage protection, short-circuit protection and the like, to ensure the safety of the test process. The data acquisition and monitoring system equipped by the utility model, including temperature, voltage, current, gas flow and the like multiple sensors, can monitor the working state of the stack in real time and record relevant data, to realize the accuracy of the data acquisition and monitoring system. In addition, a comprehensive safety protection system is also equipped, including over-temperature, over-voltage, hydrogen leakage and the like multiple protection measures, to ensure the safe operation of the stack and the gas system in the experiment process. In the case of abnormal situation, the system can automatically cut off the power supply, stop the gas supply or start other safety measures, effectively prevent accidents, and protect the safety of the experiment personnel.

[0074] The utility model discloses a solid oxide fuel cell (SOFC) electrolytic cell test conversion system, can carry out efficient, accurate test and performance evaluation to SOFC stack and SOEC electrolytic cell, and the working process includes preparation stage, test stage, data analysis stage and the cleaning link after test end. Specific as follows:

[0075] 1. Preparation stage: the preparation stage ensures that all equipment works normally and provides a stable environment for subsequent tests.

[0076] 1.1 System check: in the preparation stage, first, carry out comprehensive system check, ensure the normal operation of each component:

[0077] (1) Gas supply system: check the supply pipeline, flow meter, check valve, automatic valve and the like equipment of fuel gas (hydrogen, methane), oxidant gas (air), purging gas (nitrogen), ensure that there is no leakage and that the flow controller and valve work normally. Especially, the hydrogen system needs to ensure the connection and safety of key elements such as gas cylinder and flow meter.

[0078] (2) Temperature control system: ensure the normal operation of heating element, temperature sensor and temperature controller, accurately adjust the working temperature of SOFC stack through the temperature control system.

[0079] (3) Power management system: check the electrochemical workstation and power control system, to ensure that the voltage and current of the stack can be accurately monitored and adjusted.

[0080] (4) Data acquisition and monitoring system: confirm that all sensors (temperature, voltage, current, gas flow and the like) work normally, and ensure that the data transmission line is smooth.

[0081] (5) Safety protection system: check the over-temperature protection, over-voltage protection, short-circuit protection and the like safety functions, to ensure that the test process can automatically respond to abnormal situations.

[0082] 1.2 Sample installation:

[0083] (1) Install SOFC-SOEC stack 23: Install the SOFC stack of the SOFC-SOEC stack 23 onto the test bench and ensure that the stack is securely connected and sealed well.

[0084] (2) Connect gas pipelines: Connect the fuel gas, oxidant gas, and purge gas pipelines to the corresponding interfaces of the SOFC stack, ensuring smooth gas flow and no leakage.

[0085] (3) Connect power lines: Connect the electrochemical workstation to the SOFC stack to ensure stable transmission of current and voltage.

[0086] (4) Connect temperature sensors: Install temperature sensors at key positions of the SOFC stack (anode, cathode, electrolyte) to monitor the temperature of the stack in real time.

[0087] 2. Test phase: In the test phase, the entire system is started according to certain steps to conduct power generation tests of SOFC or electrolysis tests of SOEC.

[0088] 2.1 Preheating start:

[0089] (1) Start heating system: Gradually heat the stack through a high-temperature furnace (such as heating elements), and raise the temperature to the working temperature of SOFC (600-1000°C). This process takes 3-4 hours according to the specifications of the stack and the needs of the materials.

[0090] (2) Monitor temperature: Monitor the temperature of the stack in real time through temperature sensors to ensure uniform temperature distribution and not exceed the safety range.

[0091] 2.2 Gas supply:

[0092] (1) Start gas supply: Start the fuel gas and oxidant gas supply system, and gradually adjust the flow controller to ensure stable gas flow and meet the test requirements.

[0093] (2) Monitor gas flow: Monitor the flow of hydrogen, air, and other gases in real time through flow sensors to ensure the accuracy of experimental conditions.

[0094] 2.3 Power management:

[0095] (1) Start power supply: Turn on the power supply and gradually increase the load resistance to put the SOFC stack into working condition.

[0096] (2) Monitor voltage and current: Monitor the output voltage and current of the stack in real time through voltage and current sensors, and adjust the load resistance as needed to test the performance of the stack under different loads.

[0097] 2.4 Data Collection:

[0098] (1) Start the data collection system: Turn on the data collection module and record key parameters (such as temperature, voltage, current, gas flow, etc.) in real time.

[0099] (2) Real-time monitoring: Use data monitoring software to view all parameters in real time to ensure the stability of the test process.

[0100] 2.5 Safety Protection:

[0101] (1) Monitor temperature, pressure, and circuit status: Throughout the test process, the system continuously monitors the temperature, pressure, and circuit status of the stack to ensure that all parameters do not exceed the safety upper limit and avoid overheating, overpressure, short circuit, and other faults.

[0102] 3. Data Analysis Phase: After the test is completed, data is sorted and analyzed to evaluate the performance of the SOFC stack and generate relevant reports.

[0103] 3.1 Data Sorting:

[0104] (1) Export data: Export test data from the data collection system and save it as a CSV or Excel file format.

[0105] (2) Data cleaning: Clean the data to remove outliers and noise to ensure data accuracy.

[0106] 3.2 Data Analysis:

[0107] (1) Performance evaluation: Calculate key performance indicators such as output power, efficiency, and internal resistance of the stack based on test data to evaluate the running state of the SOFC stack.

[0108] (2) Stability evaluation: Analyze the stability of the stack under different load conditions and check for unstable current and voltage fluctuations.

[0109] (3) Fault diagnosis: Analyze possible fault points and reasons based on data changes and propose optimization solutions.

[0110] 3.3 Report Generation:

[0111] (1) Generate test report: Write a detailed test report including test purpose, method, results, and conclusions.

[0112] (2) Chart display: Use charts to display the trend of key parameters (such as voltage, current, temperature, gas flow, etc.) to visually present test results.

[0113] 4. SOEC Hydrogen Production Test Mode: After completing the SOFC power generation performance test, switch to SOEC mode for hydrogen production performance testing. The switching process is as follows:

[0114] 4.1 Water Supply System Management: Open the components such as ion water tank (11), metering pump (12), automatic switch valve (13), etc., and the water supply system works normally.

[0115] 4.2 Mode Switching: Wait for the open circuit voltage (OCV) in SOEC mode to stabilize, then perform I / V curve, electrochemical impedance spectroscopy (EIS), durability, and other performance tests.

[0116] 4.3 Switching Time: The switching mode takes about 30 minutes, and the system automatically adjusts the gas, temperature, and moisture supply to ensure that the working conditions in SOEC mode are suitable.

[0117] 5. Test End Stage: After the test is completed, the system enters the shutdown stage and performs necessary shutdown operations and equipment cleaning:

[0118] 5.1 System Shutdown:

[0119] (1) Turn off the power: gradually reduce the load resistance and turn off the power, and shut down the system.

[0120] (2) Turn off the gas supply: close the valves of fuel gas, oxidant gas, and purge gas to ensure that there is no residual gas in the gas system.

[0121] (3) Turn off the heating system: turn off the heating elements and let the stack cool naturally to room temperature.

[0122] 5.2 Clean up the site:

[0123] (1) Clean the SOFC stack and test bench to ensure that the equipment is clean and tidy.

[0124] (2) Return the test tools and equipment to their original positions and restore the test bench to its initial state, ready for the next test.

[0125] See Figure 2 and Figure 3As shown, the SOFC test results show that the open circuit voltage is 1.07V, the voltage is 0.68V at a current of 50A, and the power is 34W. The SOEC test results show that at a voltage of 1.5V electrolysis, the current is 60A, and the power is 93w. The electrolytic cell test conversion system of the utility model can operate in dual mode. In SOFC mode, the test bench operates as a fuel cell, directly converting chemical energy in fuel into electrical energy. After switching to SOEC mode, the test bench can use an external power source to decompose water into hydrogen and oxygen, realizing the conversion of electrical energy into chemical energy, and providing strong support for the research and application of SOFC and SOEC technology. The electrolytic cell test conversion system for solid oxide fuel cells (SOFC) can realize the rapid switching of SOFC power generation mode and SOEC electrolysis mode, and provide a stable and accurate test environment. Through comprehensive system checks, precise gas and water supply, precise temperature control and power management systems, and complete data collection and analysis processes, the efficiency of each test and the reliability of the data can be ensured. In addition, the safety protection system, the rapid switching function and the automatic operation design further improve the safety of the test and the simplicity of the operation.

[0126] The test conversion system can realize the rapid switching between SOFC power generation mode and SOEC electrolysis mode, and the switching time is not more than 30 minutes. The high-efficiency switching capability greatly improves the experimental test efficiency, and is especially suitable for research and development work that requires frequent switching of working modes. Through the automatic control system, the gas supply, water supply system and temperature control system can be automatically adjusted, reducing manual intervention and operation time, and improving the convenience and accuracy of the test.

[0127] The utility model discloses a test conversion system for solid oxide fuel cells (SOFC), which can realize the rapid switching between SOFC power generation mode and SOEC electrolysis mode, and the switching time is not more than 30 minutes. The high-efficiency switching capability greatly improves the experimental test efficiency, and is especially suitable for research and development work that requires frequent switching of working modes. Through the automatic control system, the gas supply, water supply system and temperature control system can be automatically adjusted, reducing manual intervention and operation time, and improving the convenience and accuracy of the test.

[0128] The utility model discloses a test conversion system for solid oxide fuel cells (SOFC), which can realize the rapid switching between SOFC power generation mode and SOEC electrolysis mode, and the switching time is not more than 30 minutes. The high-efficiency switching capability greatly improves the experimental test efficiency, and is especially suitable for research and development work that requires frequent switching of working modes. Through the automatic control system, the gas supply, water supply system and temperature control system can be automatically adjusted, reducing manual intervention and operation time, and improving the convenience and accuracy of the test.

[0129] In summary, the solid oxide fuel cell electrolytic cell test conversion system has significant advantages in many aspects, including efficient working mode switching capability, accurate gas and moisture supply system, optimized temperature control system, precise data acquisition and monitoring, comprehensive safety guarantee and modular design. These advantages enable the electrolytic cell test conversion system to significantly improve the efficiency, accuracy and safety of solid oxide fuel cell and electrolytic cell testing, suitable for laboratory research, technical development and large-scale testing, etc. It has high practical value and application prospect.

[0130] The technical features of the above embodiments can be combined in any way, and to make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0131] The above embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A test cell conversion system for solid oxide fuel cells, characterized by, The application relates to a SOFC-SOEC stack, which comprises at least one SOFC unit, the SOFC unit being used for chemical energy to electric energy conversion or electrolytic hydrogen production; a gas supply system, which comprises a fuel gas supply assembly, an oxidant gas supply assembly and a purge gas supply assembly connected with the SOFC-SOEC stack; a water supply system, which is connected with the SOFC-SOEC stack and is used for supplying deionized water to the SOFC-SOEC stack when electrolytic water is used to produce hydrogen; a temperature control system, which comprises a high-temperature furnace, heating elements and temperature sensors, the SOFC-SOEC stack is installed in the high-temperature furnace, the heating elements are arranged between pipelines connected with the SOFC-SOEC stack, gas supply system and water supply system, and the temperature sensors are used for measuring the temperature required by the SOFC-SOEC stack; and a safety control system, which is connected with the SOFC-SOEC stack and comprises an electrochemical workstation for power management and a data acquisition system for recording, monitoring and adjusting the operation parameters of the SOFC-SOEC stack in real time. The SOFC-SOEC stack comprises one or more SOFC units, which have two working modes of SOFC mode and SOEC mode. The fuel gas supply assembly comprises a fuel gas cylinder, a fuel gas flowmeter, a one-way valve I, a flame arrester and an automatic valve I, the fuel gas cylinder is sequentially provided with the fuel gas flowmeter, the one-way valve I, the flame arrester and the automatic valve I on an output pipeline of the fuel gas cylinder, is used for providing fuel gas to the SOFC stack, and the fuel gas is hydrogen or methane. The oxidant gas supply assembly comprises an air compressor, an air flowmeter, a one-way valve II and an automatic valve II, the air compressor is connected with the SOFC-SOEC stack through an oxidant gas pipeline, the air compressor output end is sequentially provided with the air flowmeter, the one-way valve II and the automatic valve II on the oxidant gas pipeline, is used for providing oxidant gas to the SOFC stack of the SOFC-SOEC stack, and the oxidant gas is air. The purge gas supply assembly comprises a nitrogen cylinder, a nitrogen flowmeter, a one-way valve III, an automatic valve III and a three-way valve I, is used for providing nitrogen for purging and preventing gas leakage. The water supply system comprises a deionized water tank, a metering pump and an automatic switch valve, the deionized water tank is adjusted by the metering pump and the automatic switch valve arranged on the pipeline.

2. The electrolytic cell test conversion system for solid oxide fuel cells according to claim 1, characterized by, The automatic valve I in the fuel gas supply assembly is connected with the three-way valve I in the purge gas supply assembly, the three-way valve I is connected with the automatic switch valve in the water supply system through the three-way valve II arranged on the pipeline, and the three-way valve II is also connected with the SOFC-SOEC stack through a pipeline.

3. The electrolytic cell test conversion system for solid oxide fuel cells according to claim 2, characterized by, ​ 4. The electrolytic cell test conversion system for solid oxide fuel cells according to claim 3, characterized by, ​ 5. The electrolytic cell test conversion system for solid oxide fuel cells according to claim 4, characterized by, ​ 6. The electrolytic cell test conversion system for solid oxide fuel cells according to claim 5, characterized by, ​ 7. The electrolytic cell test conversion system for solid oxide fuel cells according to claim 6, characterized by, ​ 8. The electrolytic cell test conversion system for solid oxide fuel cells according to claim 7, characterized by, The SOFC-SOEC stack is installed in a high-temperature furnace of a temperature control system by a support, the heating element is a spring heater heat tracing pipeline connected with the automatic valve II and the SOFC-SOEC stack, and the high-temperature furnace and the heating element of the temperature control system are used to provide a working temperature of 600-1000℃ for the SOFC-SOEC stack in the SOFC power generation mode and the SOEC electrolysis mode.

9. The electrolytic cell test conversion system for solid oxide fuel cells according to claim 8, characterized by, The temperature sensor is installed at the anode, cathode and electrolyte of the SOFC-SOEC stack.

10. The electrolytic cell test conversion system for solid oxide fuel cells according to claim 8, characterized by, A water vapor generator, an automatic valve IV and a spring heater heat tracing pipeline are further installed between the three-way valve II and the SOFC-SOEC stack, an air outlet pipeline, a gas washing bottle and a fuel gas outlet pipeline are further connected to the SOFC-SOEC stack, the air outlet pipeline is used to discharge the excess oxidant gas provided by the air compressor in the oxidant gas supply assembly, the gas washing bottle is used to collect the excess liquid during the blowing of the blowing gas supply assembly, and the fuel gas outlet pipeline is used to discharge the excess gas during the blowing of the blowing gas supply assembly and the excess fuel gas input from the fuel gas bottle in the fuel gas supply assembly.

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