Fuel cell power generation equipment

Abstract

To provide a fuel cell power generation device capable of suppressing a cooling system from being excessively cool.SOLUTION: A fuel cell power generation device comprises: a fuel cell; a cooling system that supplies heating medium oil to the fuel cell; a pump provided on the cooling system to circulate the heating medium oil to the cooling system; a heater for heating the heating medium oil between an outlet of the fuel cell and a suction port of the pump; a temperature sensor that measures a temperature of the heating medium oil between the heater and the suction port; and a control device that increases or decreases a flow rate of the heating medium oil depending on the temperature measured by the temperature sensor.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] FIELD OF THE DISCLOSURE The present disclosure relates to fuel cell power plants. [Background technology]

[0002] Conventionally, when a fuel cell system is started up, if the fuel cell heat medium is below a predetermined temperature, a technique is known in which the temperature of the fuel cell heat medium is increased by an electric heater to quickly warm up the fuel cell (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-161080 Summary of the Invention [Problem to be solved by the invention]

[0004] Because thermal oil or water has insulating properties, it is sometimes used as a heat transfer medium for cooling fuel cells. Thermal oil, which has a higher viscosity than water, has poorer heat transfer performance. Therefore, when thermal oil is used to cool a fuel cell, the heat from the heater is not easily transferred to the thermal oil, and the heat tends to build up in the heater. For this reason, a minimum flow rate of thermal oil flowing through the cooling system is generally specified to prevent the heater from overheating or being damaged.

[0005] However, if the flow rate of the thermal oil in the cooling system is too high when the temperature of the thermal oil is relatively low, the temperature of the cooling system may become too low, which may result in, for example, a longer operating time of the heater to heat the thermal oil, resulting in increased energy loss.

[0006] The present disclosure provides a fuel cell power generation system that can prevent the cooling system from becoming overcooled. [Means for solving the problem]

[0007] In one aspect of the present disclosure, A fuel cell; a cooling system that supplies thermal oil to the fuel cell; a pump provided in the cooling system for circulating the thermal oil through the cooling system; a heater for heating the thermal oil between an outlet of the fuel cell and a suction port of the pump; a temperature sensor for measuring the temperature of the thermal oil between the heater and the suction port; a control device that increases or decreases the flow rate of the thermal oil in accordance with the temperature measured by the temperature sensor. [Effects of the Invention]

[0008] According to one aspect of the present disclosure, it is possible to prevent the cooling system from becoming overcooled. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a diagram illustrating an example of the configuration of a fuel cell power generation device according to an embodiment; [Figure 2] FIG. 10 is a diagram showing a first example of the relationship between the heater outlet temperature and the lower limit flow rate of thermal oil. [Figure 3] 3 is a flowchart illustrating an example of an operation control method for a fuel cell power generation system according to an embodiment. [Figure 4] 3 is a diagram showing various manipulated variables generated by a control device of a fuel cell power generation system according to an embodiment; FIG. [Figure 5] 10 is a flowchart showing an example of a method for setting a lower limit flow rate of thermal oil. [Figure 6] FIG. 10 is a diagram showing a second example of the relationship between the heater outlet temperature and the lower limit flow rate of the thermal oil. DETAILED DESCRIPTION OF THE INVENTION

[0010] An embodiment will be described below.

[0011] Fig. 1 is a diagram showing an example of the configuration of a fuel cell power generation system according to one embodiment. The fuel cell power generation system 11 shown in Fig. 1 is a system that receives a fuel gas and an oxidizing gas and converts them into electrical energy. The fuel cell power generation system 11 includes, for example, a fuel cell 13, a DC-AC converter 12, a cooling system 27, a pump 28, a heater 19, a temperature sensor 17, an expansion tank 24, and a control device 20.

[0012] The fuel cell 13 is a device that electrochemically converts the chemical energy of fuel such as hydrogen or methanol into electrical energy. The fuel cell 13 has an anode 14, an cathode 15, and a cooling plate 16. The fuel cell 13 generates electricity through an electrochemical reaction between hydrogen or hydrogen-rich gas supplied to the anode 14 and oxygen contained in reaction air supplied to the cathode 15 by an air blower 22. The heat generated by the power generation of the fuel cell 13 is removed by the cooling plate 16 incorporated in the cell stack, and the temperature of the fuel cell 13 is maintained at a predetermined operating temperature.

[0013] The fuel cell 13 has an inlet 13b through which thermal oil for cooling the fuel cell 13 is introduced, and an outlet 13a through which the thermal oil is discharged after passing through a cooling plate 16 of the fuel cell 13. The heat generated in the fuel cell 13 is released together with the thermal oil discharged from the cooling plate 16 to the outlet 13a.

[0014] The DC-AC converter 12 is a DC-AC converter that converts DC power obtained by power generation by the fuel cell 13 into AC power and supplies it to a load (not shown). The DC-AC converter 12 may be replaced with a DC-DC converter that converts the voltage of the DC power obtained by power generation by the fuel cell 13 into DC power of a different voltage and supplies it to a load (not shown).

[0015] The cooling system 27 is a cooling circuit that supplies thermal oil such as insulating oil to the fuel cell 13. The cooling system 27 includes, for example, a cooling plate 16 provided in the fuel cell 13, an outlet path 27a that connects the outlet 13a of the fuel cell 13 and the suction port 28a of the pump 28, and an inlet path 27b that connects the discharge port 28b of the pump 28 and the inlet 13b of the fuel cell 13. The thermal oil discharged from the discharge port 28b of the pump 28 to the inlet path 27b circulates through the cooling system 27.

[0016] Pump 28 is a circulation pump provided in cooling system 27, and circulates thermal oil through cooling system 27. Pump 28 has suction port 28a, which is an inlet for the thermal oil, and discharge port 28b, which is an outlet for the thermal oil. Pump 28 is operated by a motor (not shown) controlled by control device 20.

[0017] The heater 19 heats the thermal oil between the outlet 13a of the fuel cell 13 and the suction port 28a of the pump 28. The heater 19 is, for example, a circulation heater provided in the outlet path 27a between the outlet 13a and the suction port 28a, and heats the thermal oil flowing in the outlet path 27a.

[0018] The temperature sensor 17 measures the temperature T of the thermal oil between the heater 19 and the suction port 28a, and outputs a sensor signal corresponding to the measured temperature T. The temperature sensor 17 is provided, for example, in a path portion of the outlet path 27a between the outlet of the heater 19 and the suction port 28a of the pump 28, and measures the temperature T of the thermal oil that has passed through the outlet of the heater 19. In the example shown in FIG. 1 , the temperature sensor 17 measures the temperature T between the expansion tank 24 and the heater 19.

[0019] The expansion tank 24 branches off from the outlet path 27a of the cooling system 27 and is connected to the outlet path 27a downstream of the heater 19. The expansion tank 24 has functions, for example, to absorb the expansion or contraction of the thermal oil and to release gases and the like generated in the thermal oil into the atmosphere. The expansion tank 24 is provided at the top of the cooling system 27 and is installed, for example, so that the liquid level of the thermal oil contained in the expansion tank 24 is higher than the uppermost cooling plate 16 (FIG. 1 shows the position on the circuit, but does not show the actual installation position).

[0020] The control device 20 is a controller that increases or decreases the flow rate of thermal oil flowing through the cooling system 27 in accordance with the temperature measured by the temperature sensor 17. The control device 20 is, for example, a programmable logic controller (PLC).

[0021] The control device 20 energizes the heater 19 to heat the thermal oil, and deenergizes the heater 19 to stop heating the thermal oil by the heater 19. The control device 20 controls the operation of the pump 28, and more specifically, controls an inverter that drives a motor that operates the pump 28.

[0022] The functions of the control device 20 may be realized by a processor such as a CPU (Central Processing Unit) operating according to a program stored in a memory. The functions of the control device 20 may also be realized by an FPGA (Field Programmable Gate Array) or an ASIC (Application Specific Integrated Circuit).

[0023] When the fuel cell power generation system 11 is started up or when the temperature of the heat medium flowing through the cooling system 27 is below a predetermined temperature threshold, the control device 20 heats the heat medium flowing through the cooling system 27 using the heater 19, thereby quickly warming up the fuel cell 13. However, because the heat transfer performance of heat transfer oil is lower than that of water such as pure water, the heat from the heater 19 is not easily transferred to the heat transfer oil, and the heat tends to build up in the heater 19. For this reason, it is necessary to flow the heat transfer oil through the cooling system 27 at a flow rate above a certain level to prevent the heater 19 from overheating and causing burnout.

[0024] However, when the temperature of the thermal oil is relatively low, if the flow rate of the thermal oil flowing through the cooling system 27 is too high, the temperature of the cooling system 27 may become too low. If the temperature of the cooling system 27 becomes too low, for example, the heater 19 needs to be energized for a longer time to heat the thermal oil, resulting in increased energy loss.

[0025] In this embodiment, an upper limit temperature T3 (see FIG. 2) is set in advance so that the temperature of the heater 19 does not exceed the maximum allowable operating temperature of the heater 19. The upper limit temperature T3 is the maximum temperature allowed for the temperature T of the thermal oil on the outlet side of the heater 19 (heater outlet temperature). There is a correlation between the heater outlet temperature of the thermal oil and the circulating flow rate of the thermal oil flowing through the cooling system 27. Specifically, the heater outlet temperature of the thermal oil decreases as the circulating flow rate of the thermal oil increases. The control device 20 utilizes this correlation to increase or decrease the lower limit of the flow rate of the thermal oil flowing through the cooling system 27 (e.g., the lower limit flow rate discharged from the pump 28) in accordance with the temperature T measured by the temperature sensor 17 (see FIG. 2). In the example shown in FIG. 2, the control device 20 controls the lower limit of the flow rate of the thermal oil flowing through the cooling system 27 as the temperature T measured by the temperature sensor 17 decreases.

[0026] By performing such control, the control device 20 can reduce the flow rate of thermal oil circulated through the cooling system 27 in a temperature range where the heater outlet temperature of the thermal oil is lower than the upper limit temperature T3. This prevents the cooling system 27 from being overcooled, thereby, for example, shortening the time that the heater 19 is energized to heat the thermal oil, thereby suppressing an increase in energy loss. Furthermore, the control device 20 measures the temperature T of the thermal oil after heating by the heater 19 using the temperature sensor 17, and can therefore increase or decrease the flow rate of the thermal oil passing through the heater 19 with high precision to prevent the heater 19 from overheating.

[0027] The control device 20 can increase or decrease the flow rate of the thermal oil passing through the heater 19 in the cooling system 27, for example, by increasing or decreasing the flow rate of the thermal oil discharged from the discharge port 28b of the pump 28 to the inlet path 27b of the cooling system 27, depending on the temperature T measured by the temperature sensor 17.

[0028] 2, the controller 20 decreases the lower limit of the flow rate flowing through the cooling system 27 as the temperature T measured by the temperature sensor 17 decreases. This allows the controller 20 to reduce the flow rate flowing through the cooling system 27 to the lower limit flow rate, which is set lower as the temperature T measured by the temperature sensor 17 decreases. Furthermore, according to the example shown in FIG. 2, the controller 20 can control the flow rate flowing through the cooling system 27 so that the flow rate flowing through the cooling system 27 does not decrease below the lower limit flow rate, which is set lower as the temperature T measured by the temperature sensor 17 decreases.

[0029] Next, the embodiment shown in FIG. 1 will be described in more detail.

[0030] The fuel cell power generation system 11 may include a temperature sensor 18. If the temperature sensor 17 is an example of a first temperature sensor, the temperature sensor 18 is an example of a second temperature sensor.

[0031] Temperature sensor 18 measures the temperature t of the thermal oil between discharge port 28b of pump 28 and inlet 13b of fuel cell 13, and outputs a sensor signal corresponding to the measured temperature t. Temperature sensor 18 is provided, for example, in a path portion of inlet path 27b between discharge port 28b of pump 28 and inlet 13b of fuel cell 13, and measures the temperature t of the thermal oil just before it enters inlet 13b.

[0032] The control device 20 controls the flow rate of the thermal oil flowing through the cooling system 27 in accordance with the temperature t measured by the temperature sensor 18, and increases or decreases the lower limit of the flow rate of the thermal oil flowing through the cooling system 27 in accordance with the temperature T measured by the temperature sensor 17. This allows the flow rate of the thermal oil flowing through the cooling system 27 to be adjusted in accordance with the temperature t on the inlet 13b side of the fuel cell 13, and the lower limit of the flow rate of the thermal oil flowing through the cooling system 27 to be adjusted in accordance with the temperature T on the outlet side of the heater 19.

[0033] The fuel cell power generation system 11 may include a bypass path 26 connected in parallel to the pump 28. The bypass path 26 is a circulation path whose inlet side is connected to the discharge port 28b and whose outlet side is connected to the suction port 28a. The bypass path 26 is provided with a control valve 25 and a heat exchanger 31. The cooling system 27 is configured so that a portion of the thermal oil discharged from the pump 28 is sent to the cooling plate 16 of the fuel cell 13, and the remaining thermal oil is returned to the suction port 28a side of the pump 28 via the heat exchanger 31 and the control valve 25 on the bypass path 26.

[0034] The control device 20 adjusts the temperature of the thermal oil flowing through the cooling system 27 by controlling the aperture of the regulating valve 25 in accordance with the temperature t of the thermal oil measured by the temperature sensor 18. For example, the control device 20 can control the temperature t of the thermal oil measured by the temperature sensor 18 to a predetermined target temperature by controlling the aperture of the regulating valve 25. In this way, the control device 20 can adjust the temperature of the fuel cell 13 to a target temperature corresponding to the power generation current of the fuel cell 13.

[0035] The heat exchanger 31 is supplied with an external heat medium such as external cooling water and exchanges heat with the heat transfer oil flowing in the bypass path 26. The external heat medium is heat exchanged by passing through a heat exchanger 36 and is supplied to a radiator 38. The radiator 38 is, for example, a cooler that air-cools the external heat medium using a fan or the like. The external heat medium whose temperature has been reduced by the radiator 38 is supplied to the heat exchanger 31.

[0036] Fig. 3 is a flowchart showing an example of an operation control method for a fuel cell power generation system according to an embodiment. Fig. 4 is a diagram showing each manipulated variable generated by a control device for a fuel cell power generation system according to an embodiment. The magnitude of each manipulated variable shown on the vertical axis of Fig. 4 is scaled as appropriate. Next, Figs. 3 and 4 will be described.

[0037] When the fuel cell power generator 11 is started by turning on the main power supply, the control device 20 starts the operation of the pump 28 so that the thermal oil circulates through the cooling system 27. In step S10, the control device 20 determines whether the temperature t on the inlet 13b side detected by the temperature sensor 18 during operation of the pump 28 at or after start-up is lower than a predetermined first threshold temperature t1 (see FIG. 4). If the temperature t is equal to or lower than the first threshold temperature t1, the control device 20 energizes the heater 19 to heat the thermal oil to a temperature appropriate for cooling the fuel cell 13 (step S20). On the other hand, if the temperature t is higher than the first threshold temperature t1, the control device 20 de-energizes the heater 19 (step S40).

[0038] In step S20, the control device 20 increases the output of the heater 19 as the temperature t on the inlet 13b side detected by the temperature sensor 18 decreases (see FIG. 4). This allows the thermal oil to be heated quickly when the temperature t is relatively low and the temperature t is equal to or lower than the first threshold temperature t1. In step S20, the control device 20 gradually decreases the output of the heater 19 as the temperature t on the inlet 13b side detected by the temperature sensor 18 increases (see FIG. 4).

[0039] In step S30, the control device 20 determines whether the temperature t on the inlet 13b side detected by the temperature sensor 18 is equal to or lower than the first temperature threshold value t1. If the temperature t is equal to or lower than the first temperature threshold value t1, the control device 20 continues heating by the heater 19 (step S20). On the other hand, if the temperature t is higher than the first temperature threshold value t1, the control device 20 determines that the temperature increase of the thermal oil is complete and stops heating by the heater 19 (step S40). In this way, the control device 20 stops heating the thermal oil by the heater 19 after the temperature t measured by the temperature sensor 18 exceeds the first threshold temperature t1 (see FIG. 4).

[0040] In step S50, the control device 20 controls the flow rate of the thermal oil flowing through the cooling system 27 by PI adjustment in accordance with the temperature t measured by the temperature sensor 18. The P in PI represents proportional control, and the I represents integral control. For example, when the temperature t measured by the temperature sensor 18 is higher than a first threshold temperature t1, the control device 20 increases or decreases the flow rate of the thermal oil discharged from the pump 28 to the cooling system 27 by PI adjustment so that the temperature t measured by the temperature sensor 18 becomes a predetermined target temperature. For example, the control device 20 performs PI adjustment so that the flow rate of the thermal oil discharged from the pump 28 to the cooling system 27 increases as the deviation ΔT obtained by subtracting the target temperature from the temperature t measured by the temperature sensor 18 becomes larger. This accelerates the decrease in the temperature of the thermal oil circulating through the cooling system 27, and therefore the temperature t measured by the temperature sensor 18 (equivalent to the temperature of the fuel cell 13) can approach the target temperature more quickly.

[0041] In step S50, when the temperature t measured by the temperature sensor 18 is higher than a first threshold temperature t1, the control device 20 may control the regulator valve 25 so that the higher the temperature t of the thermal oil measured by the temperature sensor 18, the greater the opening degree (see FIG. 4). The greater the opening degree of the regulator valve 25, the greater the flow rate of the thermal oil passing through the heat exchanger 31 on the bypass path 26. This accelerates the decrease in the temperature of the thermal oil circulating through the cooling system 27, allowing the temperature t measured by the temperature sensor 18 (equivalent to the temperature of the fuel cell 13) to approach the target temperature more quickly. When the temperature t measured by the temperature sensor 18 exceeds a second threshold temperature t2, the control device 20 stops the control for increasing the opening degree of the regulator valve 25 and maintains the opening degree of the regulator valve 25 at the maximum opening degree. The second threshold temperature t2 is set higher than the first threshold temperature t1.

[0042] FIG. 5 is a flowchart showing an example of a method for setting the lower limit flow rate of thermal oil. FIG. 6 is a diagram showing the relationship between the heater outlet temperature and the lower limit flow rate of thermal oil in the setting method of FIG. 5. When increasing or decreasing the flow rate of thermal oil flowing through the cooling system 27 (for example, when increasing or decreasing the flow rate of thermal oil through PI adjustment in step 50 of FIG. 3 described above), the control device 20 sets the lower limit flow rate of thermal oil flowing through the cooling system 27, for example, according to the examples shown in FIGS. 5 and 6. Note that F1 <F2<F3であり、T1<T2<T3<T4である。

[0043] In step S60, the control device 20 determines whether the heater outlet temperature measured by the temperature sensor 17 is equal to or lower than the upper limit temperature T3. The upper limit temperature T3 is the maximum temperature allowed for the heater outlet temperature. If the heater outlet temperature is not equal to or lower than the upper limit temperature T3, the control device 20 sets the lower limit flow rate of the thermal oil to F3 (step S65). On the other hand, if the heater outlet temperature is equal to or lower than the upper limit temperature T3, the control device 20 determines whether the heater outlet temperature measured by the temperature sensor 17 is equal to or lower than the upper limit temperature T2 (step S70). If the heater outlet temperature is not equal to or lower than the upper limit temperature T2, the control device 20 sets the lower limit flow rate of the thermal oil to F3 (step S75). On the other hand, if the heater outlet temperature is equal to or lower than the upper limit temperature T2, the control device 20 determines whether the heater outlet temperature measured by the temperature sensor 17 is equal to or lower than the upper limit temperature T1 (step S80). If the heater outlet temperature is not equal to or lower than the upper limit temperature T1, the control device 20 sets the lower limit flow rate of the thermal oil to F2 (step S85). On the other hand, if the heater outlet temperature is equal to or lower than the upper limit temperature T1, the control device 20 sets the lower limit flow rate of the thermal oil to F1 (step S90).

[0044] The control device 20 increases or decreases the flow rate of the thermal oil flowing through the cooling system 27 so that the flow rate of the thermal oil flowing through the cooling system 27 does not fall below the lower limit flow rate set in accordance with Figures 5 and 6. As a result, the lower the heater outlet temperature, the more the flow rate of the thermal oil flowing through the cooling system 27 can be reduced. Therefore, in a temperature range where the heater outlet temperature is relatively low, it is possible to prevent the cooling system 27 from being cooled too much due to an excess of thermal oil flowing through the cooling system 27.

[0045] In addition, when increasing or decreasing the flow rate of the thermal oil flowing through the cooling system 27 (for example, when increasing or decreasing the flow rate of the thermal oil by PI adjustment in step 50 of Figure 3 above), the control device 20 may set a lower limit flow rate of the thermal oil flowing through the cooling system 27 according to the example shown in Figure 2 above.

[0046] In addition, when the heater outlet temperature measured by the temperature sensor 17 rises to the heater protection temperature T4, the control device 20 may stop power generation by the fuel cell 13 and stop operation of the fuel cell power generation device 11 to prevent the heater 19 from burning out.

[0047] Although the embodiments have been described above, the technology of the present disclosure is not limited to the above-described embodiments, and various modifications and improvements are possible, such as combinations with or substitutions for part or all of other embodiments. [Explanation of symbols]

[0048] 11 Fuel cell power generation equipment 12 DC-AC converter 13 Fuel Cell 13a Exit 13b Entrance 14 Fuel electrode 15 Air electrode 16 Cooling plate 17 Temperature Sensor 18 Temperature Sensor 19 Heater 20 Control device 22 Air blower 24 Expansion tank 25 Control valve 26 Bypass Route 27 Cooling system 27a Exit Route 27b Entrance route 28 Pump 28a Intake port 28b Outlet 31 Heat exchanger 36 Heat exchange equipment 38 Heat sink

Claims

1. A fuel cell; a cooling system that supplies thermal oil to the fuel cell; a pump provided in the cooling system for circulating the thermal oil through the cooling system; a heater for heating the thermal oil between an outlet of the fuel cell and a suction port of the pump; a temperature sensor for measuring the temperature of the thermal oil between the heater and the suction port; A control device that increases or decreases the flow rate of the thermal oil according to the temperature measured by the temperature sensor; a bypass path provided with a control valve and a heat exchanger and connected in parallel to the pump; An inlet side of the bypass path is connected to a discharge port of the pump, and an outlet side of the bypass path is connected to the suction port into which the thermal oil heated by the heater is sucked, A fuel cell power generation apparatus in which a portion of the thermal oil discharged from the discharge port is returned from the outlet side of the bypass path to the suction port side via the heat exchanger and the control valve.

2. a second temperature sensor for measuring the temperature of the thermal oil between the discharge port of the pump and the inlet of the fuel cell; 2. The fuel cell power generation system according to claim 1, wherein the control device controls the opening degree of the adjustment valve in accordance with the temperature measured by the second temperature sensor.

3. 3. The fuel cell power generation system according to claim 2, wherein the control device stops heating the thermal oil by the heater after the temperature measured by the second temperature sensor exceeds a predetermined threshold temperature.

4. A fuel cell power generation device as described in Claim 3, wherein the control device increases the opening of the control valve as the temperature measured by the second temperature sensor increases when the temperature measured by the second temperature sensor is higher than the threshold temperature.

5. 5. The fuel cell power generation system according to claim 2, wherein the control device controls the temperature measured by the second temperature sensor to a predetermined target temperature.

6. 6. The fuel cell power generation system according to claim 1, wherein the control device sets a lower limit of the flow rate in accordance with the temperature measured by the temperature sensor.

7. 7. The fuel cell power generation system according to claim 6, wherein the control device controls the flow rate so that the flow rate does not fall below the lower limit.

8. 8. The fuel cell power generation system according to claim 6, wherein the control device sets the lower limit lower as the temperature measured by the temperature sensor becomes lower.

9. 9. The fuel cell power generation apparatus according to claim 1, wherein the control device increases or decreases the flow rate discharged from the pump outlet to the cooling system in accordance with the temperature measured by the temperature sensor.

10. 10. The fuel cell power generation system according to claim 1, wherein the control device increases or decreases the flow rate passing through the heater in accordance with the temperature measured by the temperature sensor.

11. A fuel cell power generation device as described in claim 3 or 4, wherein the control device reduces the output of the heater the higher the temperature measured by the second temperature sensor is when the temperature measured by the second temperature sensor is lower than the threshold temperature.

12. A fuel cell power generation apparatus as described in Claim 4, wherein the control device stops increasing the opening of the control valve to maintain the opening of the control valve, and controls the flow rate discharged from the pump outlet to the cooling system.

13. A fuel cell power generation device described in any one of claims 1 to 12, wherein the control device adjusts the temperature of the thermal oil flowing through the cooling system by controlling the opening degree of the adjustment valve.

14. A fuel cell power generation device described in any one of claims 1 to 13, wherein the control device adjusts the temperature of the fuel cell to a target temperature corresponding to the power generation current of the fuel cell by controlling the opening degree of the adjustment valve.

15. A fuel cell power generation device described in any one of claims 1 to 14, wherein the control device stops power generation by the fuel cell when the temperature measured by the temperature sensor rises to a predetermined temperature.

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