Carbon fuel cell fuel continuous feeding device and performance test method thereof

Abstract

The application discloses a carbon fuel cell fuel continuous feeding device and a performance testing method thereof. The feeding device comprises a carbon fuel cell assembly, a feeding device, an oxygen increasing pump, a nitrogen storage tank, a temperature control table, a table type universal meter, an electrochemical workstation and a supporting frame. A motor in the feeding device drives a shaft coupling to rotate, which drives a spiral feeding rod inside the lower side of a feeding pipe to rotate, and carbon fuel stored inside the upper side of the feeding pipe is transported to a stainless steel pipe and then to the inside of a zirconium oxide crucible, so that the carbon fuel cell assembly can be continuously supplied with carbon fuel, the use efficiency of the carbon fuel cell is improved, and the workload of personnel is reduced. The mass flow meter and the nitrogen storage tank can transport nitrogen to the feeding pipe in the feeding device, and the carbon fuel inside the feeding pipe is prevented from being oxidized to carbon dioxide by air through the nitrogen, so that the carbon fuel cell assembly can be better put into use, and the use performance of the carbon fuel cell assembly is improved.

Description

Technical Field

[0001] This invention belongs to the field of fuel cell technology, specifically relating to a continuous fuel feeding device for carbon fuel cells and its performance testing method. Background Technology

[0002] The concept of direct carbon fuel cells (DCFC) was proposed by Sir William Grove in 1839. Dr. William W. Jacques first built a single DCFC cell and a DCFC battery pack consisting of 100 single cells in 1896, and successfully generated electricity. This DCFC has a simple structure; it uses stainless steel as the cathode and container, molten sodium hydroxide as the electrolyte, and carbon rods as fuel and anode. During battery operation, the molten sodium hydroxide electrolyte will corrode to form sodium carbonate due to the generated CO2, which will lead to a decrease in battery performance. The battery cannot be continuously refueled, so the fuel cell cannot be used continuously for a long time. Ultimately, this research could not be industrialized because of the low energy output density and the easily contaminated molten electrolyte.

[0003] For example, application number CN114361533A discloses a test method for a carbon fuel cell system with a three-electrode structure. A tubular electrolyte is selected to construct a battery reaction system. A three-electrode testing device is added to the battery system. At different reaction temperatures, the polarization of the cathode and anode is studied using a reference electrode. Through experimental design, the discharge performance of the battery under different reaction conditions is studied, and the polarization characteristic curves of the anode and cathode are obtained to determine the optimal battery reaction conditions. Based on the experimental results, the three-electrode testing device is optimized to improve the polarization of the anode and cathode, thus perfecting the fuel cell reaction system.

[0004] However, the carbon fuel in the battery of this application is continuously consumed, which reduces the anode potential and degrades the battery performance. In order for the battery to be used continuously, the carbon fuel needs to be continuously replenished. When the battery is working for a long time, the battery efficiency will be reduced and the workload of personnel will be increased. Summary of the Invention

[0005] The purpose of this invention is to provide a continuous fuel feeding device for carbon fuel cells to solve the problems of reduced battery efficiency and increased workload mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A continuous fuel feeding device for a carbon fuel cell includes a carbon fuel cell assembly, a feeding device, an oxygen pump, a nitrogen storage tank, a temperature controller, a benchtop multimeter, an electrochemical workstation, and a support frame. The carbon fuel cell assembly generates electrical energy. The feeding device delivers carbon fuel to the carbon fuel cell. The oxygen pump is connected to the carbon fuel cell assembly via an oxygen pipe and provides oxygen for the electrochemical reaction. The nitrogen storage tank is equipped with a mass flow meter to control the nitrogen flow rate and provides nitrogen to the feeding device to protect the carbon fuel from oxidation into carbon dioxide by air. The temperature controller detects the electrochemical reaction temperature of the carbon fuel cell assembly. The benchtop multimeter measures various performance characteristics of the carbon fuel cell assembly. The electrochemical workstation tests the open-circuit voltage, constant current polarization, and potentiodynamic scanning performance of the carbon fuel cell assembly. The support frame supports and mounts the feeding device.

[0008] Preferably, the feeding device includes a feeding pipe, a stainless steel pipe, a coupling, and a motor. The top of the feeding pipe is provided with a nitrogen connection port, and the lower side of the feeding pipe is provided with a spiral feeding rod, which is fixedly connected to the connecting shaft of the motor through the coupling. The lower left end of the feeding pipe is provided with a stainless steel pipe.

[0009] Preferably, the carbon fuel cell assembly includes a heating furnace, a zirconia crucible, a reference electrode, an anode, and a cathode. The heating furnace contains a zirconia crucible, and the upper end of the zirconia crucible is provided with a corundum cover. The corundum cover is provided with a reference electrode and an anode that extend vertically into the interior of the zirconia crucible. The outer side of the zirconia crucible is provided with a cathode, and the interior of the zirconia crucible contains carbon fuel.

[0010] Preferably, the corundum cover has a third, a fourth, and a fifth circular hole respectively. The third circular hole is used to fix the anode, the fourth circular hole is used to fix the reference electrode, and the fifth circular hole is used to fix the stainless steel tube, with the bottom of the stainless steel tube extending into the inside of the zirconia crucible.

[0011] Preferably, the reference electrode comprises a gold wire and an alumina cylinder, wherein the lower outer wall of the gold wire is provided with an alumina cylinder.

[0012] Preferably, the temperature controller includes a thermocouple extending into the heating furnace, and the temperature controller measures the temperature inside the heating furnace via the thermocouple.

[0013] Preferably, the support frame has a second circular hole for motor installation, the support frame has a first circular hole, and the gas pipe of the nitrogen storage tank is connected to the nitrogen connection port after passing through the first circular hole.

[0014] Preferably, the end of the oxygen pipe furthest from the oxygen pump is provided with a high-temperature resistant gas outlet.

[0015] Furthermore, the present invention also discloses a performance testing method for the above-mentioned continuous fuel feeding device for carbon fuel cells, comprising the following process steps:

[0016] 1) Simulation experiments were conducted on different solid carbon powder feed rates over time at different motor power levels; carbon fuel was prepared by mixing coal powder, lithium carbonate, and sodium carbonate in a certain proportion.

[0017] 2) Preparation of anode: Make several small holes in a circular nickel foam with silver wire; then thread the silver wire in an umbrella-shaped structure with one wire above the other; finally, lead the silver wire out from the center of the nickel foam and place the above structure at the bottom of the inner side of the zirconium oxide crucible. Add an appropriate amount of prepared carbon fuel on it, and the silver wire that is led out serves as the anode.

[0018] 3) Preparation of cathode: Silver wire is used as the conductive material. Silver paste is dissolved in the organic solvent ethyl acetate in a fume hood and then coated onto the outer surface of the zirconia crucible. After coating, the silver wire is wound into a circular wave shape and then the silver wire is firmly fixed to the zirconia crucible with iron wire. After that, another layer of silver paste is brushed on and the mixture is allowed to air dry naturally. The drawn silver wire is used as the cathode.

[0019] 4) Assembly of the feeding device: Connect the feeding support frame, motor, coupling, feeding device and stainless steel pipe;

[0020] 5) Place the battery into the heating furnace and connect the assembled feeding device to the fifth round hole of the battery inlet; place the reference electrode into the battery structure, taking care to avoid connecting the reference electrode to the anode silver wire as much as possible.

[0021] 6) Fill the furnace chamber and the top of the battery with cotton insulation to prevent heat loss; when filling the insulation, pay special attention to avoid contact between the gold wire of the reference electrode, the silver wire of the cathode, and the silver wire of the anode to prevent short circuit; connect the battery electrodes to the electrochemical workstation and benchtop multimeter according to the test requirements to test the battery performance.

[0022] 7) Open the gas valve of the nitrogen storage tank to release the stored nitrogen, and use a mass flow meter to control the nitrogen flow so that the nitrogen can be stably delivered to the feed pipe of the feeding device.

[0023] 8) Start the program to heat up, detect and control the temperature of the heating furnace through a temperature controller, obtain the battery open circuit voltage diagram through an electrochemical workstation, obtain the anode potential diagram through a benchtop multimeter, after the temperature slowly rises to 800℃, keep the temperature constant, test the battery performance, and the small light bulb can be lit up; after the temperature reaches 800℃ and is maintained for a certain period of time, the anode potential gradually decreases; start the feeding experiment.

[0024] 9) Feeding test: First, ensure that the motor circuit is normal; then add carbon fuel into the feeding device and connect the nitrogen protection tube; then turn on the motor switch, let the motor rotate forward, and adjust the motor power to the maximum; the motor drives the screw feed rod of the feeding device to rotate, and the carbon fuel in the device falls down under the action of gravity under the protection of nitrogen, and is carried out of the feeding device by the rotating feed rod and enters the battery through the stainless steel tube;

[0025] 10) Obtain battery performance data according to experimental requirements using an electrochemical workstation and a benchtop multimeter.

[0026] Compared with the prior art, the carbon fuel cell continuous feeding device and its performance testing method of the present invention have the following advantages:

[0027] Beneficial effects:

[0028] 1. The present invention uses a motor in the feeding device to drive the coupling to rotate, which in turn drives the spiral feeding rod inside the lower side of the feeding pipe to rotate, and transports the carbon fuel stored inside the upper side of the feeding pipe to the stainless steel pipe, and then to the inside of the zirconia crucible through the stainless steel pipe. This allows for continuous replenishment of carbon fuel for the carbon fuel cell assembly, improves the efficiency of the carbon fuel cell, and reduces the workload of personnel.

[0029] 2. This invention uses a mass flow meter and a nitrogen storage tank to deliver nitrogen to the feed pipe in the feeding device. The nitrogen prevents the carbon fuel inside the feed pipe from being oxidized into carbon dioxide by the air, thereby enabling the carbon fuel cell assembly to be put into better use and improving the performance of the carbon fuel cell assembly. Attached Figure Description

[0030] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0031] Figure 1 This is a schematic diagram of a continuous fuel feeding device for a carbon fuel cell proposed in this invention.

[0032] Figure 2 This is a three-dimensional structural diagram of the assembly of the feeding device and the battery;

[0033] Figure 3 A schematic diagram of the three-dimensional structure supporting the frame;

[0034] Figure 4 A schematic diagram of the three-dimensional assembly of the zirconia crucible and the corundum lid;

[0035] Figure 5 A graph showing the relationship between the amount of graphite fed into the experimental motor (20 kW, 10W) ​​and time.

[0036] Figure 6 A graph showing the relationship between the feed rate and time for an experimental 20W 30W motor and the experimental graphite feed rate.

[0037] Figure 7 A graph showing the relationship between the amount of graphite fed into the experimental motor (20 kW, 50W) and time.

[0038] Figure 8 A graph showing the relationship between the feed rate and time for an experimental 70W motor and graphite.

[0039] Figure 9 A graph showing the relationship between the feed rate and time for an experimental 20-ton motor with a power of 90W and the experimental graphite feed rate.

[0040] Figure 10 A graph showing the relationship between the weight of pulverized coal falling over time when the experimental motor has a power of 20W and a power of 90W.

[0041] Figure 11 This is the potential diagram for anode 11;

[0042] In the diagram: 1. Feed pipe; 2. Stainless steel pipe; 3. Support frame; 4. Temperature controller; 5. Mass flow meter; 6. Nitrogen storage tank; 7. Gold wire; 8. Oxygen pump; 9. Oxygen pipe; 10. Thermocouple; 11. Anode; 12. Carbon fuel; 13. Zirconia crucible; 14. Heating furnace; 15. Corundum cover; 16. Cathode; 17. Alumina cylinder; 18. Benchtop multimeter; 19. Electrochemical workstation; 20. Motor; 21. Coupling; 22. Nitrogen connection port; 23. First round hole; 24. Second round hole; 25. Third round hole; 26. Fourth round hole; 27. Fifth round hole. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] Example 1

[0045] Please see Figure 1-4This invention provides a continuous fuel feeding device for a carbon fuel cell, comprising a carbon fuel cell assembly, a feeding device, an oxygen pump 8, a nitrogen storage tank 6, a temperature controller 4, a benchtop multimeter 18, an electrochemical workstation 19, and a support frame 3. The carbon fuel cell assembly is used to generate electrical energy; the feeding device is used to supply carbon fuel 12 to the carbon fuel cell assembly; the oxygen pump 8 is connected to the carbon fuel cell assembly via an oxygen pipe 9, and the oxygen pump 8 is used to provide oxygen for the electrochemical reaction of the carbon fuel cell assembly; the nitrogen storage tank 6 is equipped with a mass flow meter 5 for controlling the nitrogen flow rate, and the nitrogen storage tank 6 is used to provide oxygen for the feeding device. Nitrogen gas is used to prevent carbon fuel 12 from being oxidized into carbon dioxide by air; temperature controller 4 is used to detect and control the electrochemical reaction temperature of the carbon fuel cell assembly; benchtop multimeter 18 is used to measure various performance characteristics of the carbon fuel cell assembly; electrochemical workstation 19 is used to test the open-circuit voltage, constant current polarization, and potentiodynamic scanning performance of the carbon fuel cell assembly. One detection terminal of the electrochemical workstation 19 is connected to the anode 11 of the carbon fuel cell assembly, and the other detection terminal is connected to the cathode 16. During operation, it can be connected to a computer to obtain various data about the battery; support frame 3 is used for the installation and support of the feeding device.

[0046] like Figure 1 and Figure 2 As shown, the feeding device includes a feeding pipe 1, a stainless steel pipe 2, a coupling 21, and a motor 20. The top of the feeding pipe 1 is provided with a nitrogen connection port 22. The lower side of the feeding pipe 1 is provided with a spiral feeding rod, which is fixedly connected to the connecting shaft of the motor 20 through the coupling 21. The lower left end of the feeding pipe 1 is provided with a stainless steel pipe 2. The feeding pipe 1 is a transparent glass pipe with red markings. The feeding pipe 1 is provided with a glass cover, and the nitrogen connection port 22 is located on the glass cover. The feeding device can complete the continuous feeding operation.

[0047] like Figure 1 , Figure 2 and Figure 4 The carbon fuel cell assembly includes a heating furnace 14, a zirconia crucible 13, a reference electrode, an anode 11, and a cathode 16. The zirconia crucible 13 is located inside the heating furnace 14. An alumina cover 15 is located at the upper end of the zirconia crucible 13. The reference electrode and anode 11 are vertically inserted into the zirconia crucible 13 on the alumina cover 15. The cathode 16 is located on the outer side of the zirconia crucible 13. Carbon fuel 12 is located inside the zirconia crucible 13. A third circular hole 25, a fourth circular hole 26, and a fifth circular hole 27 are respectively opened on the alumina cover 15. The third circular hole 25 is used to fix the anode 11, the fourth circular hole 26 is used to fix the reference electrode, and the fifth circular hole 27 is used to fix a stainless steel tube 2, with the bottom of the stainless steel tube 2 extending into the zirconia crucible 13. The reference electrode includes a gold wire 7 and an alumina cylinder 17. The alumina cylinder 17 is located on the lower outer wall of the gold wire 7. Through the carbon fuel cell assembly, electrical energy can be generated more effectively.

[0048] like Figure 1 As shown, the temperature controller 4 includes a thermocouple 10 extending into the heating furnace 14. The temperature controller 4 measures the temperature inside the heating furnace 14 through the thermocouple 10. Through the temperature controller 4, the temperature generated by the heating furnace 14 can be better monitored and controlled, so that the carbon fuel cell assembly can stably generate electricity.

[0049] like Figure 1 , Figure 2 and Figure 3 As shown, the support frame 3 has a second circular hole 24 for mounting the motor 20, and a first circular hole 23. The gas pipe of the nitrogen storage tank 6 passes through the first circular hole 23 and connects to the nitrogen connection port 22. The support frame 3 enables better support and installation work.

[0050] like Figure 1 As shown, the oxygen pipe 9 is provided with a high-temperature resistant gas outlet at the end away from the oxygen pump 8. Through the oxygen pump 8, oxygen pipe 9 and high-temperature resistant gas outlet, the oxygen environment of the cathode 16 can be better provided, ensuring that the oxygen in the air can form oxygen negative ions in the cathode 16, pass through the zirconium oxide crucible 13 and enter the battery, combine with the solid carbon fuel 12, and undergo an electrochemical reaction at the anode 11 to generate electrical energy.

[0051] Example 2

[0052] A performance testing method for a continuous fuel feeding device for carbon fuel cells can be described as follows:

[0053] The working principle and usage process of this invention: During the experiment, an external simulated feed is needed for safe feeding to check if feeding can be done safely, thus avoiding experimental failure due to feeding failure and the waste of electrode materials and experimental carbon fuel; The experimental idea is as follows: After the device is set up, an electronic balance is placed below the outlet of the device. The motor 20 is run as in normal operation. After the motor 20 rotates, it drives the shaft to send out the carbon fuel in the feeding device. When the balance just starts to display a reading, the stopwatch is turned on and the reading is recorded every 30 seconds. Ten readings are recorded under different motor 20 power levels until feeding is stopped after 5 minutes, and the power is changed.

[0054] The simulation experiment proceeded as follows: First, the motor 20 was assembled, then the coupling 21 and the feeding device were connected. After assembling the device, the motor 20 was fixed, and then the feeding device was fixed through the pre-dug hole. After it was securely fixed, solid carbon powder was slowly added to the feeding device through the feeding port at the top using a funnel. After closing the cover, the control switch of the motor 20 was turned on. At this time, the motor 20 slowly rotated, driving the shaft of the feeding device to rotate slowly as well, slowly feeding the solid carbon fuel out of the device. The feeding was carried out slowly at motor 20 rotation power of 10W, 30W, 50W, 70W, and 90W respectively. Based on the feeding time and the corresponding feeding amount, a graph showing the relationship between the feeding amount and the rotation time of the motor 20 can be obtained. Figure 5-9 As shown;

[0055] The initial simulation experiment used graphite powder. Much of the graphite powder adhered to the inner wall of the feeding device, with only a small portion falling into the beaker through the feeding device. Subsequently, a simulation experiment was conducted using pulverized coal as a solid carbon powder, obtaining the relationship between feed rate and time, such as... Figure 10 As shown in the figure, a comparison of the curves showing the relationship between the feed rate and time of graphite powder reveals that the feed rate of coal powder per unit time is faster at 90W power, reducing the feed time and providing a strong guarantee for the safety and reliability of the experiment.

[0056] After completing the simulation experiment, the battery manufacturing process began. 6g of lithium carbonate, 12g of sodium carbonate and 18g of coal powder were added to a beaker and mixed to prepare carbon fuel 12 for the fuel cell.

[0057] To increase contact with carbon fuel 12, nickel foam material was used. Several small holes were punched in the circular nickel foam with silver wire. Then, the silver wire was threaded in an umbrella-like structure with one wire above the other. Finally, the silver wire was led out from the center of the nickel foam and placed on the bottom of the inner side of the zirconium oxide crucible 13. An appropriate amount of prepared carbon fuel 12 was added on top of it, and the led-out silver wire served as the anode 11. The nickel foam played a fixing role, and its porosity increased the contact with carbon fuel 12, thereby improving the performance of the battery.

[0058] The following is the fabrication process of cathode 16. To ensure the reliability of the experiment and reduce the resistance of cathode 16, silver wire is used as the conductive material. First, silver paste is dissolved in the organic solvent ethyl acetate in a fume hood, and then it is applied to the outer surface of the zirconia crucible 13. After the application is completed, the silver wire is wound into a circular wave shape, and then the silver wire is firmly fixed to the zirconia crucible 13 with iron wire. After that, another layer of silver paste is brushed on and allowed to air dry naturally. The drawn silver wire serves as cathode 16.

[0059] Assembly of the feeding device: Fix the feeding support frame 3 in one position, then fix the motor 20 to the second round hole 24. After fixing the motor 20, connect the smaller hole in the coupling 21 to the shaft of the motor 20, and then tighten the hole in the coupling 21 with hex pliers. In this way, the coupling 21 and the motor 20 are fixed. Then, connect the larger hole in the coupling 21 to the white rotating shaft in the feeding device 1, and fix the feeding device with hex pliers. After completing the connection of the feeding device, two iron pliers are needed to clamp them to prevent the feeding device from shaking due to the rotation of the motor 20. Then, use a rubber tube to connect the bottom outlet of the feeding device 1 to the stainless steel tube 2. Because according to the current temperature of the experiment, the stainless steel tube needs to enter the battery. Since the stainless steel tube and the glass tube are both rigid tubes, they cannot be directly connected. Therefore, a rubber tube can be used as a connection medium.

[0060] After completing the preparation of the anode 11, cathode 16 and feeding device, put the battery into the heating furnace 14 and connect the assembled feeding device to the fifth round hole 27 of the battery feeding port; put the reference electrode into the battery structure, and take care to avoid connecting the reference electrode to the silver wire of the anode 11 as much as possible.

[0061] To prevent heat loss, stuff the furnace chamber and the battery with cotton insulation. When stuffing the insulation, take special care to avoid contact between the gold wire 7 of the reference electrode, the silver wire of the cathode 16, and the silver wire of the anode 11 to prevent short circuits. Connect the silver wire of the anode 11, fixed by nickel foam in the anode material on the zirconia crucible 13, to the negative terminal of the electrochemical workstation 19, while connecting the cathode 16 to the positive terminal of the electrochemical workstation 19. After connecting the cathode 16 and the anode 11, connect a benchtop multimeter 18. The benchtop multimeter 18 can measure the potential of the anode 11 relative to the reference electrode. To measure the potential of the anode 11, connect the reference electrode to the positive terminal of the benchtop multimeter 18 and the anode 11 to the negative terminal of the benchtop multimeter 18.

[0062] Open the gas valve of nitrogen storage tank 6 to release the nitrogen stored inside, and control the nitrogen through mass flow meter 5 so that the nitrogen can be stably delivered to the feed pipe 1 of the feeding device.

[0063] The temperature is increased at a power of approximately 8°C per minute, starting from the initially set 20°C and increasing to 100°C over 10 minutes, then held for 5 minutes. The temperature is then increased from 100°C to 200°C over 15 minutes, and held for another 5 minutes. Subsequently, the temperature is increased to 300°C and held, then to 500°C and held, and finally to 800°C and maintained at that temperature. The images displayed on the computer include the open-circuit voltage diagram output from the electrochemical workstation 19, connected to the cathode 16 and anode 11; and the potential diagram of anode 11, connected to the silver wire of anode 11 and the reference electrode, output from the benchtop multimeter 18.

[0064] After the temperature is slowly raised to 800℃, the battery performance is tested by keeping the temperature constant, which can make the light bulb light up.

[0065] When the temperature reached 800℃ and was maintained for a certain period of time, the battery voltage stabilized at 1.1 volts, and the anode potential also stabilized at about 0.5 volts. In order to verify the effect of coal powder fuel replenishment on the experiment, the battery was discharged for another 12,000 seconds, and the anode potential gradually decreased. Then the feeding experiment was started.

[0066] During the feeding experiment, first ensure that the circuit of motor 20 is normal; then add carbon fuel 12 into the feeding device 1 and connect the nitrogen protection tube; then turn on the motor 20 switch to make motor 20 rotate forward and adjust the power of motor 20 to the maximum; the motor drives the spiral feed rod of the feeding device to rotate, and the carbon fuel 12 in the device falls under the action of gravity under the protection of nitrogen, and is carried out of the feeding device by the rotating feed rod and enters the battery through the stainless steel tube 2.

[0067] Depend on Figure 11 It can be seen that after feeding, at 14000 seconds, the anode potential begins to rise rapidly, and then fluctuates to 0.58V. Before feeding, the anode potential curve is relatively smooth, but after feeding is started, the anode potential increases significantly. This indicates that the continuous feeding device improves battery performance, enhances battery stability, saves battery manufacturing costs, and reduces the workload of personnel.

[0068] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A continuous fuel feeding device for a carbon fuel cell, characterized in that, include: A carbon fuel cell assembly for generating electricity; the carbon fuel cell assembly includes a heating furnace, a zirconia crucible, a reference electrode, an anode, and a cathode. The heating furnace contains a zirconia crucible, the upper end of which is provided with a corundum cover. The corundum cover is provided with a reference electrode and an anode that extend vertically into the interior of the zirconia crucible. The outer side of the zirconia crucible is provided with a cathode, and the interior of the zirconia crucible contains carbon fuel. The reference electrode includes a gold wire and an alumina cylinder, with the alumina cylinder on the lower outer wall of the gold wire; the corundum cap has a third, a fourth and a fifth circular hole respectively, the third circular hole is used to fix the anode, the fourth circular hole is used to fix the reference electrode, and the fifth circular hole is used to fix the stainless steel tube, with the bottom of the stainless steel tube extending into the inside of the zirconia crucible. A feeding device is used to supply carbon fuel to a carbon fuel cell. The feeding device includes a feeding pipe, a stainless steel pipe, a coupling, and a motor. The top of the feeding pipe is provided with a nitrogen connection port. The lower side of the feeding pipe is provided with a spiral feeding rod, which is fixedly connected to the connecting shaft of the motor through the coupling. The lower left end of the feeding pipe is provided with a stainless steel pipe. An oxygen pump is connected to a carbon fuel cell assembly via an oxygen pipe. The oxygen pump is used to provide oxygen for the cathode electrochemical reaction of the carbon fuel cell assembly. A nitrogen storage tank, wherein the nitrogen storage tank is equipped with a mass flow meter for controlling the nitrogen flow rate, and the nitrogen storage tank is used to provide nitrogen to the feeding device to protect the carbon fuel from being oxidized into carbon dioxide by the air; A temperature controller, used to detect the electrochemical reaction temperature of a carbon fuel cell assembly; A benchtop multimeter, used to measure the performance of carbon fuel cell components; An electrochemical workstation is used to test the open-circuit voltage, constant current polarization, and potentiodynamic scanning performance of carbon fuel cell components. A support frame for mounting and supporting the feeding device.

2. The continuous fuel feeding device for carbon fuel cells according to claim 1, characterized in that: The temperature controller includes a thermocouple extending into the furnace, and the temperature controller measures the temperature inside the furnace via the thermocouple.

3. The continuous fuel feeding device for carbon fuel cells according to claim 1, characterized in that: The support frame has a second circular hole for motor installation, and a first circular hole. The gas pipe of the nitrogen storage tank passes through the first circular hole and is connected to the nitrogen connection port.

4. The continuous fuel feeding device for carbon fuel cells according to claim 1, characterized in that: The oxygen tube is equipped with a high-temperature resistant gas outlet at the end furthest from the oxygen pump.

5. The performance testing method for the continuous fuel feeding device for carbon fuel cells according to any one of claims 1-4, characterized in that: The process includes the following steps: 1) Simulation experiments were conducted on different solid carbon powder feed rates over time at different motor power levels; carbon fuel was prepared by mixing coal powder, lithium carbonate, and sodium carbonate in a certain proportion. 2) Preparation of anode: Make several small holes in a circular nickel foam with silver wire; then thread the silver wire in an umbrella-shaped structure with one wire above the other. Finally, lead the silver wire out from the center of the nickel foam and place the above structure at the bottom of the inner side of the zirconium oxide crucible. Add an appropriate amount of prepared carbon fuel on it and use the silver wire that is led out as the anode. 3) Preparation of cathode: Silver wire is used as the conductive material. Silver paste is dissolved in the organic solvent ethyl acetate in a fume hood and then coated onto the outer surface of the zirconia crucible. After coating, the silver wire is wound into a circular wave shape and then fixed firmly to the zirconia crucible with iron wire. After that, another layer of silver paste is brushed on and allowed to air dry naturally. The drawn silver wire is used as the cathode. 4) Assembly of the feeding device: Connect the feeding support frame, motor, coupling, feeding device and stainless steel pipe; 5) Place the battery into the heating furnace and connect the assembled feeding device to the fifth round hole of the battery feeding port; Place the reference electrode inside the battery structure, ensuring that the reference electrode is not connected to the anode silver wire; 6) Fill the furnace chamber and the top of the battery with insulating cotton to prevent heat loss; when filling the insulating cotton, do not let the gold wire of the reference electrode, the silver wire of the cathode, and the silver wire of the anode come into contact to prevent short circuit; connect the battery electrodes to the electrochemical workstation and benchtop multimeter according to the test requirements to test the battery performance. 7) Open the gas valve of the nitrogen storage tank to release the stored nitrogen, and use a mass flow meter to control the nitrogen flow so that the nitrogen can be stably delivered to the feed pipe of the feeding device. 8) Start the program to heat up, detect and control the temperature of the heating furnace using a temperature controller, obtain the battery open circuit voltage diagram using an electrochemical workstation, and obtain the anode potential diagram using a benchtop multimeter; after the temperature slowly rises to 800℃, maintain the temperature constant and test the battery performance, which can make the small light bulb light up; after the temperature reaches 800℃ and is maintained for a certain period of time, the anode potential gradually decreases; start the feeding experiment. 9) Feeding test: First, ensure that the motor circuit is normal; then add carbon fuel into the feeding device and connect the nitrogen protection tube; then turn on the motor switch, let the motor rotate forward, and adjust the motor power to the maximum; the motor drives the screw feed rod of the feeding device to rotate, and the carbon fuel in the device falls down under the action of gravity under the protection of nitrogen, and is carried out of the feeding device by the rotating feed rod and enters the battery through the stainless steel tube; 10) Obtain battery performance data according to experimental requirements using an electrochemical workstation and a benchtop multimeter.

Images