Power supply system

Abstract

To provide a power supply system suited to suppress degradation of the power generation efficiency of the power supply system which is equipped with a solar power generation facility.SOLUTION: A power supply system 100 according to the present disclosure includes a solar power generation facility 10 including a solar power generation panel 11, and a fuel battery facility 20. At least one selected from a group consisting of drain water DW generated as a result of power generation in the fuel battery facility 20 and hot water C2 generated by recovering heat that is generated as a result of power generation in the fuel battery facility 20 flows on a surface 11s of the solar power generation panel 11.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a power supply system. [Background technology]

[0002] Patent Document 1 discloses a solar cell module comprising a solar cell assembly in which a plurality of solar cells are assembled, and a frame surrounding the solar cell assembly, with a piping section formed in at least a part of the frame, a water flow channel provided in the piping section, and a sprinkler port for spraying flowing water onto the light receiving surfaces of the solar cells formed so as to communicate with the water flow channel. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-32354 A Summary of the Invention [Problem to be solved by the invention]

[0004] The present disclosure provides a technique suitable for suppressing a decrease in power generation efficiency of a power supply system equipped with a solar power generation facility. [Means for solving the problem]

[0005] The power supply system according to the present disclosure includes: A solar power generation facility including a solar power generation panel; A fuel cell facility; Equipped with At least one selected from the group consisting of wastewater generated by power generation in the fuel cell facility and hot water from which heat generated by power generation in the fuel cell facility has been recovered flows over the surface of the solar power generation panel. Effect of the Invention

[0006] The technology disclosed herein is suitable for suppressing a decrease in power generation efficiency of a power supply system equipped with a solar power generation facility. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a configuration diagram of a power supply system according to an embodiment. [Diagram 2] A configuration diagram showing an example of a fuel cell facility. [Diagram 3] Configuration diagram of a power supply system in Modification 1 [Figure 4A] A diagram showing an example of the timing of draining wastewater onto the surface of a solar panel [Figure 4B] A diagram showing another example of the timing of draining wastewater over the surface of a solar panel. [Diagram 5] Configuration diagram of a power supply system in Modification 2 [Figure 6] Configuration diagram of a power supply system in Modification 3 [Figure 7] Configuration diagram of a power supply system in Modification 4 [Figure 8] Configuration diagram of a power supply system in Modification 5 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] (The knowledge and other information that formed the basis of this disclosure) At the time when the present inventors came up with the present disclosure, the cleaning of photovoltaic panels of photovoltaic power generation facilities was being studied. Various substances such as sand and pollen contained in the air can adhere to the surface of the photovoltaic power generation panel. These substances adhered to the surface of the photovoltaic power generation panel lead to a decrease in the power generation efficiency of the photovoltaic power generation facility. For example, in the solar cell module described in Patent Document 1, the photovoltaic power generation panel is cleaned by spraying running water on the light receiving surface of the photovoltaic power generation panel.

[0009] The present inventors have found that if tap water is used to wash a solar panel, mineral components such as silicon contained in the tap water may precipitate and adhere to the surface of the solar panel. The mineral components adhered to the surface of the solar panel may reduce the power generation efficiency of the solar power generation facility.

[0010] Furthermore, the present inventors have found that the accumulation of snow or ice on the surface of a solar power generation panel leads to a decrease in the power generation efficiency of the solar power generation facility.

[0011] Therefore, the present inventors have investigated techniques suitable for suppressing a decrease in the power generation efficiency of a power supply system equipped with a photovoltaic power generation facility.

[0012] Hereinafter, the embodiments will be described in detail with reference to the drawings. However, more detailed explanation than necessary may be omitted. For example, detailed explanation of already well-known matters or duplicate explanation of substantially the same configuration may be omitted. This is to avoid the following explanation from becoming more redundant than necessary and to facilitate understanding by those skilled in the art.

[0013] The accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter recited in the claims.

[0014] (Embodiment) Hereinafter, an embodiment will be described with reference to FIG. 1 to FIG.

[0015] [1-1. Configuration] 1 is a configuration diagram of a power supply system 100 according to the present embodiment. The power supply system 100 includes a solar power generation facility 10 including a solar power generation panel 11, and a fuel cell facility 20. In the power supply system 100, at least one selected from the group consisting of wastewater DW generated by power generation in the fuel cell facility 20 and hot water C2 from which heat generated by power generation in the fuel cell facility 20 has been recovered flows over a surface 11s of the solar power generation panel 11.

[0016] According to the power supply system 100, the surface 11s of the photovoltaic power generation panel 11 can be washed not with tap water but with wastewater DW generated by power generation in the fuel cell equipment 20, which prevents mineral components such as silicon from adhering to the surface 11s and suppresses a decrease in the power generation efficiency of the photovoltaic power generation equipment 10. In addition, the cost of washing the photovoltaic power generation panel 11 can be reduced compared to using tap water.

[0017] Snow or ice on the surface of the solar power generation panel of the solar power generation facility reduces the power generation efficiency of the solar power generation facility. According to the power supply system 100, the snow or ice can be melted using hot water C2 that has recovered heat generated by the power generation of the fuel cell facility 20, so that the decrease in the power generation efficiency of the solar power generation facility 10 can be suppressed. Also, compared to the case where hot water is separately prepared, the snow or ice on the surface 11s of the solar power generation panel 11 can be melted at a lower cost.

[0018] In the power supply system 100, both the drainage water DW and the hot water C2 may flow over the surface 11s of the photovoltaic power generation panel 11. For example, after snow or ice on the surface 11s of the photovoltaic power generation panel 11 is melted by the hot water C2, the surface 11s of the photovoltaic power generation panel 11 may be washed (rinsed) by the drainage water DW. This makes it possible to prevent mineral components such as silicon from precipitating due to the hot water C2 used to melt the snow or ice.

[0019] 2 is a configuration diagram showing an example of a fuel cell equipment 20 included in the power supply system 100. The fuel cell equipment 20 includes a fuel cell stack 21 and a power conversion device 22. The fuel cell stack 21 generates power by being supplied with an anode gas G1 and a cathode gas G2. The anode gas G1 is hydrogen gas. The cathode gas G2 is an oxygen-containing gas such as air. Examples of fuel cells include a polymer electrolyte fuel cell (PEFC) and a solid oxide fuel cell (SOFC). The power conversion device 22 may include a DC-DC converter and a DC-AC inverter.

[0020] In the fuel cell stack 21, direct current power DC is generated by an electrochemical reaction between the anode gas G1 and the cathode gas G2. The direct current power DC generated in the fuel cell stack 21 is converted into alternating current power AC by the power converter 22 and supplied to a load (not shown) outside the system.

[0021] During operation, excess water produced by electrochemical reactions is discharged from the fuel cell stack 21 as wastewater DW. The wastewater DW is pure water that contains no or very little impurities, and does not contain mineral components such as silicon as does tap water. In this specification, "pure water" means water having an electrical resistivity in the range of 1.0 μS / cm to 0.1 μS / cm. Generally, the electrical resistivity of tap water is in the range of 100 μS / cm to 200 μS / cm.

[0022] The amount of evaporation residue of the wastewater DW may be 20 mg / L or less. The temperature of the wastewater DW is, for example, 40°C or less. The lower limit of the temperature of the wastewater DW is not particularly limited and may be about the outside air temperature. The lower limit of the temperature of the wastewater DW may be, for example, 0°C or more and 30°C or less.

[0023] The fuel cell equipment 20 further includes a heat exchanger 23, an exhaust heat recovery path 24, and a coolant path 25. The exhaust heat recovery path 24 includes a first portion 24a and a second portion 24b. The first portion 24a connects an outlet of the fuel cell stack 21 and a fluid inlet of the heat exchanger 23. The second portion 24b connects a fluid outlet of the heat exchanger 23 and an inlet of the fuel cell stack 21. The first portion 24a constitutes an upstream portion of the exhaust heat recovery path 24. The second portion 24b constitutes a downstream portion of the exhaust heat recovery path 24. The first portion 24a is a path that guides a fluid F0 to be cooled in the heat exchanger 23 to the heat exchanger 23. The fluid F0 discharged from the fuel cell stack 21 flows in the first portion 24a. The second portion 24b is a path that guides a fluid F1 cooled in the heat exchanger 23 to the fuel cell stack 21. The fluid F1 to be returned from the heat exchanger 23 to the fuel cell stack 21 flows through the second portion 24b.

[0024] The fluid F0 discharged from the fuel cell stack 21 is a heat source fluid generated by the power generation of the fuel cell equipment 20. The fluid F0 may be a gas, a liquid, or a two-phase flow containing a gas and a liquid. The fluid F0 may be a high-temperature gas or hot water.

[0025] The high-temperature gas as the fluid F0 is not particularly limited as long as it is a gas discharged from the fuel cell stack 21. The high-temperature gas as the fluid F0 may be, for example, air filled in a housing in which the fuel cell stack 21 is housed and discharged from the housing for ventilation. The high-temperature gas as the fluid F0 may be an anode off-gas or a cathode off-gas discharged from the fuel cell stack 21. The anode off-gas is discharged from the anode of the fuel cell stack 21. The cathode off-gas is discharged from the cathode of the fuel cell stack 21. The fluid F0 may be exhaust gas generated when the solid electrolyte of the SOFC is heated.

[0026] The hot water as the fluid F0 may be excess water produced by the electrochemical reaction in the fuel cell stack 21.

[0027] The temperature of the fluid F0 may vary depending on the type of the fuel cell stack 21. In one specific example, the temperature of the fluid F0 is in the range of 65° C. to 75° C., although the temperature of the fluid F0 is not limited thereto.

[0028] The heat exchanger 23 is disposed in the second portion 24b of the exhaust heat recovery path 24. The heat exchanger 23 is, for example, a liquid-liquid heat exchanger such as a double-pipe heat exchanger or a plate-type heat exchanger. In the heat exchanger 23, heat is exchanged between the fluid F0 and a refrigerant C1 so that the fluid F0 discharged from the fuel cell stack 21 is cooled. In this embodiment, the refrigerant C1 is water.

[0029] The refrigerant path 25 includes a first portion 25a and a second portion 25b. The first portion 25a is connected to a refrigerant inlet of the heat exchanger 23. The second portion 25b is connected to a refrigerant outlet of the heat exchanger 23. The first portion 25a constitutes an upstream portion of the refrigerant path 25. The second portion 25b constitutes a downstream portion of the refrigerant path 25. The first portion 25a is a path that guides the refrigerant C1 to the heat exchanger 23. The refrigerant C1 introduced from an external refrigerant tank (not shown) flows through the first portion 25a. The second portion 25b is a path that guides hot water C2, which is a refrigerant heated in the heat exchanger 23, to the outside of the fuel cell equipment 20. The hot water C2 to be sent from the fuel cell equipment 20 to the solar power generation panel 11 flows through the second portion 25b.

[0030] The temperature of the hot water C2 may vary depending on the temperature of the fluid F0 to be heat exchanged. In one specific example, the temperature of the hot water C2 is in the range of 60°C to 75°C. However, the temperature of the fluid F0 is not limited to this. Note that since the hot water C2 is obtained by recovering heat generated by the power generation of the fuel cell equipment 20, the temperature of the hot water C2 is higher than the temperature of the wastewater DW.

[0031] A pump 261 may be provided in the second portion 24b of the exhaust heat recovery path 24. The pump 261 may act to introduce the fluid F0 discharged from the fuel cell stack 21 into the heat exchanger .

[0032] A pump 262 may be provided in the first portion 25a of the refrigerant path 25. The refrigerant C1 may be introduced into the heat exchanger 23 by the action of the pump 262.

[0033] The first portion 24a of the exhaust heat recovery path 24 may be provided with a tank 27 that stores the fluid F0.

[0034] A thermistor 281 may be provided near the outlet of the fuel cell stack 21 in the first portion 24a of the exhaust heat recovery path 24. The temperature of the fluid F0 discharged from the fuel cell stack 21 may be measured by the thermistor 281. A thermistor 282 may be provided near the inlet of the fuel cell stack 21 in the second portion 24b of the exhaust heat recovery path 24. The thermistor 282 may measure the temperature of the fluid F1 introduced into the fuel cell stack 21.

[0035] The solar power generation panel 11 is usually installed with the surface 11s, which is the light receiving surface, inclined with respect to the horizontal plane so that the solar power generation panel 11 can efficiently receive the sunlight. Therefore, when at least one selected from the group consisting of the drainage water DW and the hot water C2 is guided to the upper end portion 11a of the solar power generation panel 11, it can descend by its own weight and flow over the surface 11s of the solar power generation panel 11.

[0036] As shown in FIG. 1, on the surface 11s of the solar power generation panel 11, at least one selected from the group consisting of wastewater DW and hot water C2 flows from a portion located vertically above (i.e., a high position) when the solar power generation panel 11 is installed to a portion located vertically below (i.e., a low position).

[0037] On the surface 11s of the solar power generation panel 11, the drainage water DW can flow along the surface flow paths 12. The surface flow paths 12 do not need to have a special structure. For example, the surface flow paths 12 may be flow paths naturally generated by the drainage water DW descending the surface 11s of the solar power generation panel 11 due to its own weight. The shape of the surface flow paths 12 can change depending on the inclination angle of the solar power generation panel 11, the flow rate of the drainage water DW, and the like.

[0038] On the surface 11s of the solar power generation panel 11, the hot water C2 can flow along the surface flow paths 16. The surface flow paths 16 do not need to have a special structure. For example, the surface flow paths 16 may be flow paths naturally generated by the hot water C2 descending the surface 11s of the solar power generation panel 11 due to its own weight. The shape of the surface flow paths 16 can change depending on the inclination angle of the solar power generation panel 11, the flow rate of the hot water C2, and the like.

[0039] The power supply system 100 may include a drainage path LD1 that guides the drainage DW to the surface 11s of the solar power generation panel 11. The drainage DW that has passed through the drainage path LD1 may flow over the surface 11s of the solar power generation panel 11.

[0040] The power supply system 100 may include a hot water path LC2 that guides the hot water C2 to the surface 11s of the solar power generation panel 11. The hot water C2 that has passed through the hot water path LC2 may be caused to flow onto the surface 11s of the solar power generation panel 11.

[0041] The drainage water DW that has passed through the drainage path LD1 may be made to flow onto the surface 11s of the solar power generation panel 11 via a sprinkling mechanism (not shown) that sprinkles the drainage water DW onto the surface 11s of the solar power generation panel 11. As long as the sprinkling mechanism can sprinkle the drainage water DW, the structure of the sprinkling mechanism is not particularly limited. The sprinkling mechanism may be, for example, a sprinkling pipe having sprinkling holes arranged along the upper end portion 11a of the solar power generation panel 11.

[0042] The hot water C2 that has passed through the hot water path LC2 may be made to flow onto the surface 11s of the solar power generation panel 11 via a sprinkling mechanism (not shown) that sprinkles the hot water C2 onto the surface 11s of the solar power generation panel 11. As long as the sprinkling mechanism is capable of sprinkling the hot water C2, the structure of the sprinkling mechanism is not particularly limited. The sprinkling mechanism may be, for example, a sprinkling pipe having sprinkling holes arranged along the upper end portion 11a of the solar power generation panel 11.

[0043] The solar power generation facility 10 may further include a power conversion device 13. The power conversion device 13 may include a DC-DC converter and a DC-AC inverter.

[0044] (Variation 1) 3 is a configuration diagram of a power supply system 101 in Modification 1 of the above embodiment. In the power supply system 101 in Modification 1, wastewater DW generated by power generation in the fuel cell equipment 20 flows over the surface 11s of the solar power generation panel 11.

[0045] The power supply system 101 further includes a storage tank 41 for storing the wastewater DW, and when the photovoltaic power generation facility 10 starts power generation or when the temperature of the photovoltaic power generation panel 11 exceeds a threshold temperature, the wastewater DW stored in the storage tank 41 flows onto the surface 11s of the photovoltaic power generation panel 11. In Fig. 3, the same components as those in the power supply system 100 are designated by the same reference numerals and detailed description thereof will be omitted.

[0046] In the power supply system 101, by providing a storage tank 41 for storing wastewater DW, the solar power generation panel 11 can be cleaned with the wastewater DW even during periods when the fuel cell equipment 20 is not operating and wastewater DW is not being discharged from the fuel cell equipment 20.

[0047] When the solar power generation equipment 10 starts generating power, the wastewater DW stored in the storage tank 41 may flow onto the surface 11s of the solar power generation panel 11. This allows the solar power generation panel 11 to be cleaned by the wastewater DW when the solar power generation equipment 10 starts generating power, regardless of whether the fuel cell equipment 20 is operating or not.

[0048] FIG. 4A is a diagram showing an example of the timing of flowing the wastewater DW onto the surface 11s of the solar power generation panel 11. In FIG. 4A, the horizontal axis represents time, and the vertical axis represents the power generation of the solar power generation facility 10. Since FIG. 4A is an example showing the trend between time and the power generation of the solar power generation facility 10, the scale and unit of the vertical axis are omitted. As shown in FIG. 4A, when the power generation of the solar power generation facility 10 exceeds the threshold power, it is determined that the solar power generation facility 10 has started power generation, and the wastewater DW stored in the storage tank 41 may be flowed onto the surface 11s of the solar power generation panel 11. The threshold power may be set appropriately according to the power generation capacity of the solar power generation facility 10. The threshold power may be set to 1 / 20 or more and 1 / 10 or less of the power generation capacity of the solar power generation facility 10. The threshold power may be set to 1 / 10 of the power generation capacity of the solar power generation facility 10. For example, when the power generation capacity of the solar power generation facility 10 is 5 kW, the threshold power may be set to 0.5 kW.

[0049] The power generated by the solar power generation equipment 10 is detected by a power detector (not shown), and if the detected generated power exceeds a threshold power, it is determined that the solar power generation equipment 10 has started generating power, and wastewater DW stored in the storage tank 41 may be discharged onto the surface 11s of the solar power generation panel 11.

[0050] If the temperature of the solar power generation panel 11 becomes too high, the power generation efficiency of the solar power generation facility 10 tends to decrease. Therefore, cooling of the solar power generation panel 11 is also an important issue. When the temperature of the solar power generation panel 11 exceeds a threshold temperature, the wastewater DW stored in the storage tank 41 may flow onto the surface 11s of the solar power generation panel 11. In this way, regardless of whether the fuel cell facility 20 is operating or not, the solar power generation panel 11 can be cooled by the wastewater DW during the time period when the temperature of the solar power generation panel 11 rises.

[0051] FIG. 4B is a diagram showing another example of the timing of flowing the wastewater DW onto the surface 11s of the photovoltaic panel 11. In FIG. 4B, the horizontal axis represents time, and the vertical axis represents the temperature of the photovoltaic panel 11. Since FIG. 4B is an example showing the trend between time and the temperature of the photovoltaic panel 11, the scale and unit of the vertical axis are omitted. As shown in FIG. 4B, when the temperature of the photovoltaic panel 11 exceeds a threshold temperature, the wastewater DW stored in the storage tank 41 may be flowed onto the surface 11s of the photovoltaic panel 11. In one specific example, the threshold temperature is 40° C. However, the threshold temperature is not particularly limited. For example, when the wastewater DW is flowed onto the surface 11s of the photovoltaic panel 11 at the time when the threshold temperature of FIG. 4B is exceeded, the temperature of the photovoltaic panel 11 thereafter tends to decrease.

[0052] The temperature of the solar power generation panel 11 is detected by a temperature detector (not shown), and if the detected temperature exceeds a threshold temperature, the wastewater DW stored in the storage tank 41 may be caused to flow onto the surface 11s of the solar power generation panel 11.

[0053] 3, the storage tank 41 may be provided in the drainage path LD1. A control valve 42 and a pump 43 may be provided in the drainage path LD1 downstream of the storage tank 41. The pump 43 sucks in and pumps out the drainage water DW. The pump 43 can send the drainage water DW in the storage tank 41 to the drainage path LD1. By adjusting the opening of the control valve 42, the flow rate and / or pressure of the drainage water DW flowing onto the surface 11s of the solar power generation panel 11 can be adjusted.

[0054] The power supply system 101 may further include a control device 51. The control device 51 may control the aperture of the adjustment valve 42 and the operation of the pump 43. The control device 51 receives, for example, a detection value of the power generation of the solar power generation facility 10 from a power detector (not shown) and controls the aperture of the adjustment valve 42 and the operation of the pump 43. The control device 51 receives, for example, a detection value of the temperature of the solar power generation panel 11 from a temperature detector (not shown) and controls the aperture of the adjustment valve 42 and the operation of the pump 43. The control device 51 is, for example, a computer including a storage device in which a program required for adjusting the aperture of the adjustment valve 42 and operating the pump 43 is stored, and a processor that reads out and executes the program from the storage device.

[0055] (Variation 2) 5 is a configuration diagram of a power supply system 102 in Modification 2 of the present embodiment. In the power supply system 102 in Modification 2, wastewater DW generated by power generation in the fuel cell equipment 20 flows over the surface 11s of the solar power generation panel 11.

[0056] The power supply system 102 further includes a water collection mechanism 14 that collects the wastewater DW1 after it has flowed over the surface 11s of the photovoltaic power generation panel 11, and a neutralization device 61 that neutralizes the wastewater DW1. In Fig. 5, the same components as those in the power supply system 100 are designated by the same reference numerals and detailed description thereof will be omitted.

[0057] The wastewater DW discharged from the fuel cell equipment 20 is pure water that does not contain mineral components, and therefore easily absorbs carbon dioxide in the air when it comes into contact with air. Therefore, the wastewater DW1 may be acidic after flowing over the surface 11s of the solar power generation panel 11. According to the power supply system 102, even if the wastewater DW1 is acidic, the wastewater DW1 collected by the water collection mechanism 14 can be neutralized by the neutralization device 61.

[0058] The structure of the water collecting mechanism 14 is not particularly limited as long as it can collect the drainage water DW1. The water collecting mechanism 14 may be, for example, a water collecting pipe arranged along the lower end portion 11b of the photovoltaic power generation panel 11.

[0059] The configuration of the neutralization device 61 is not particularly limited as long as it can neutralize the acidic wastewater DW1. The neutralization device 61 may include, for example, a tank and calcium carbonate contained inside the tank. When calcium carbonate dissolves in water, it is ionized into calcium ions and carbonate ions. The carbonate ions are hydrolyzed to generate hydroxide ions. The acidic wastewater DW1 is neutralized by the hydroxide ions.

[0060] The wastewater DW2 that has been neutralized in the neutralization device 61 may be discharged to the outside via a discharge path LO1.

[0061] (Variation 3) 6 is a configuration diagram of a power supply system 103 in Modification 3 of the present embodiment. In a power supply system 201 in Modification 1, at least one selected from the group consisting of wastewater DW generated by power generation in the fuel cell equipment 20 and hot water C2 from which heat generated by power generation in the fuel cell equipment 20 is recovered flows over a surface 11s of a solar power generation panel 11.

[0062] The power supply system 103 further includes a storage battery equipment 30, and has the same configuration as the power supply system 100 of the above embodiment, except that the hot water C2 flows on a surface 30s of the storage battery equipment 30. Therefore, in Fig. 6, the same components as those in the power supply system 100 are denoted by the same reference numerals and detailed description thereof will be omitted.

[0063] According to the power supply system 103, even during periods when the outside air temperature is particularly low, such as in winter, the storage battery equipment 30 can be heated by the hot water C2 that recovers heat generated by power generation by the fuel cell equipment 20. In addition, the surface 11s of the photovoltaic power generation panel 11 can be washed or cooled by the wastewater DW, and snow or ice on the surface 11s of the photovoltaic power generation panel 11 can be melted by the hot water C2.

[0064] The surface 30s of the battery equipment 30 may be at least one selected from the group consisting of a side surface and an upper surface of the battery equipment 30. In other words, the hot water C2 may flow on at least one surface 30s selected from the group consisting of a side surface and an upper surface of the battery equipment 30.

[0065] The surface 30s of the storage battery equipment 30 may be at least one side surface of the storage battery equipment 30. That is, the hot water C2 may flow along at least one side surface of the storage battery equipment 30. According to such a configuration, the hot water C2 guided to the upper end portion 30a of the storage battery equipment 30 can descend due to its own weight and flow along at least one side surface of the storage battery equipment 30.

[0066] The hot water C2 may flow over multiple surfaces 30s of the battery equipment 30.

[0067] The hot water C2 may flow along a surface flow path 32 along the surface 30s of the storage battery equipment 30. The surface flow path 32 may not have a special structure. For example, the surface flow path 32 may be a flow path naturally generated by the hot water C2 descending the surface 30s of the storage battery equipment 30 due to its own weight. The shape of the surface flow path 32 may change depending on the inclination angle of the surface 30s of the storage battery equipment 30, the flow rate of the hot water C2, etc.

[0068] The power supply system 103 may include a hot water path LC3 that guides the hot water C2 to the surface of the storage battery equipment 30. The hot water path LC3 may branch off from a hot water path LC2 that guides the hot water C2 to the surface 11s of the solar power generation panel 11. The hot water C2 that has passed through the hot water path LC3 may be caused to flow onto the surface 30s of the storage battery equipment 30.

[0069] The hot water C2 that has passed through the hot water path LC3 may be caused to flow onto the surface 30s of the battery equipment 30 via a sprinkling mechanism (not shown) that sprinkles the hot water C2 onto the surface 30s of the battery equipment 30. As long as the sprinkling mechanism is capable of sprinkling the hot water C2, the structure of the sprinkling mechanism is not particularly limited. The sprinkling mechanism may be, for example, a sprinkling pipe having sprinkling holes that is arranged along the upper end portion 30a of the surface 30s of the battery equipment 30.

[0070] The storage battery equipment 30 may include a storage battery module. The storage battery module may be, for example, a lithium ion storage battery module, a nickel-metal hydride storage battery module, a lead storage battery module, or the like.

[0071] The battery equipment 30 may further include a power conversion device. The power conversion device may include a bidirectional DC-DC converter and a DC-AC inverter.

[0072] The supply of the hot water C2 to the surface 11s of the photovoltaic power generation panel 11 and the supply of the hot water C2 to the surface 30s of the storage battery equipment 30 may be controlled by a control device (not shown).

[0073] (Variation 4) Fig. 7 is a configuration diagram of a power supply system 104 in Modification 4 of the present embodiment. In the power supply system 104 in Modification 4, wastewater DW generated by power generation in the fuel cell equipment 20 flows over the surface 11s of the solar power generation panel 11, and hot water C2 that has recovered heat generated by power generation in the fuel cell equipment 20 flows over the surface 30s of the storage battery equipment 30. Other than this, the power supply system 104 has the same configuration as the power supply system 103 in Modification 3 described above. Therefore, in Fig. 7, the same reference numerals are used for the same configuration as the power supply system 103, and detailed description thereof will be omitted.

[0074] According to the power supply system 104, the surface 11s of the solar power generation panel 11 can be cleaned or cooled not with tap water but with wastewater DW generated by power generation in the fuel cell equipment 20, and the storage battery equipment 30 can be heated with hot water C2 that has recovered heat generated by power generation in the fuel cell equipment 20.

[0075] The supply of the wastewater DW to the surface 11s of the photovoltaic power generation panel 11 and the supply of the hot water C2 to the surface 30s of the storage battery equipment 30 may be controlled by a control device (not shown).

[0076] (Variation 5) 8 is a configuration diagram of a power supply system 105 in Modification 5 of the present embodiment. In the power supply system 105 in Modification 5, at least one selected from the group consisting of wastewater DW generated by power generation of the fuel cell equipment 20 and hot water C2 from which heat generated by power generation of the fuel cell equipment 20 has been recovered flows over the surface 11s of the solar power generation panel 11. The hot water C2 from which heat generated by power generation of the fuel cell equipment 20 has been recovered flows over the surface 30s of the storage battery equipment 30.

[0077] The power supply system 105 has the same configuration as the power supply system 103 of the above-described modified example 3, except that the fuel cell equipment 20 is stacked on top of the storage battery equipment 30, and the solar power generation panel 11 is arranged on a downward slope in front of the fuel cell equipment 20 and the storage battery equipment 30. Therefore, in Fig. 8, the same components as those in the power supply system 103 are denoted by the same reference numerals and detailed description thereof will be omitted.

[0078] In the power supply system 105, at least one selected from the group consisting of the wastewater DW and the hot water C2 discharged from the fuel cell equipment 20 descends by its own weight and flows over the surface 11s of the photovoltaic power generation panel 11. The hot water C2 discharged from the fuel cell equipment 20 descends by its own weight and flows over the surface 30s of the storage battery equipment 30 arranged below the fuel cell equipment 20. According to the power supply system 105, the storage battery equipment 30 can be heated by the hot water C2 without using power such as a pump. In addition, the surface 11s of the photovoltaic power generation panel 11 can be washed or cooled by the wastewater DW without using power such as a pump, and snow or ice on the surface 11s of the photovoltaic power generation panel 11 can be melted by the hot water C2.

[0079] The fuel cell equipment 20 is stacked on top of the storage battery equipment 30, and the upper end 11a of the solar power generation panel 11 is positioned at or below the lower end 20b of the fuel cell equipment 20, so that the surface 11s of the solar power generation panel 11 may be installed at an angle with respect to the horizontal plane.

[0080] 8, the upper end 11a of the solar power generation panel 11 may be disposed between the fuel cell equipment 20 and the storage battery equipment 30, and the lower end 11b of the solar power generation panel 11 may be disposed on the ground. With this arrangement, the solar power generation panel 11 may be disposed in front of the fuel cell equipment 20 and the storage battery equipment 30 with a downward slope.

[0081] [1-2. Operation] The operation and function of the power supply systems 100, 101, 102, 103, 104, and 105 according to the present embodiment configured as above will be described below with reference to FIGS.

[0082] 2, in a fuel cell stack 21 of a fuel cell equipment 20, direct current power DC is generated by an electrochemical reaction between an anode gas G1 and a cathode gas G2. The direct current power DC generated in the fuel cell stack 21 is converted to alternating current power AC by a power converter 22 and supplied to a load (not shown) outside the system.

[0083] During operation, excess water is produced from the fuel cell stack 21 due to electrochemical reactions. The excess water is pure water that contains no or almost no impurities. The excess water is discharged from the fuel cell equipment 20 as wastewater DW.

[0084] 1, the wastewater DW discharged from the fuel cell equipment 20 flows over the surface 11s of the solar power generation panel 11 of the solar power generation equipment 10. The wastewater DW may flow onto the surface 11s of the solar power generation panel 11 via a drainage path LD1.

[0085] As a result, the wastewater DW cleans the surface 11s of the solar power generation panel 11. Since the wastewater DW does not contain mineral components such as silicon as in tap water, it is possible to prevent mineral components from precipitating and adhering to the surface 11s of the solar power generation panel 11 after cleaning.

[0086] Also, a fluid F0, which is a heat source fluid generated by power generation, is discharged from the fuel cell stack 21 during operation. The fluid F0 is introduced into the heat exchanger 23 through the first portion 24a of the exhaust heat recovery path 24. Meanwhile, the refrigerant C1 is introduced into the heat exchanger 23 through the first portion 25a of the refrigerant path 25. The fluid F0 introduced into the heat exchanger 23 is cooled by heat exchange with the refrigerant C1 and discharged from the heat exchanger 23. The fluid F1 discharged from the heat exchanger 23 is returned to the fuel cell stack 21 through the second portion 24b of the exhaust heat recovery path 24. Meanwhile, the refrigerant C1 introduced into the heat exchanger 23 is heated by heat exchange with the fluid F0 and discharged from the heat exchanger 23. The hot water C2, which is the heated refrigerant discharged from the heat exchanger 23, is discharged from the fuel cell equipment 20 through the second portion 25b of the refrigerant path 25.

[0087] 1, hot water C2 discharged from the fuel cell equipment 20 flows over the surface of the solar power generation panel 11 of the solar power generation equipment 10. The hot water C2 may be caused to flow onto the surface 11s of the solar power generation panel 11 via a hot water path LC2.

[0088] As a result, the snow or ice on the surface 11s of the photovoltaic panel 11 is melted by the hot water C2.

[0089] (Variation 1) 3, in the power supply system 101 in the first modification, the wastewater DW discharged from the fuel cell equipment 20 is temporarily stored in the storage tank 41. Then, when the photovoltaic power generation equipment 10 starts power generation or when the temperature of the photovoltaic power generation panel 11 exceeds a threshold temperature, the wastewater DW stored in the storage tank 41 flows onto the surface 11s of the photovoltaic power generation panel 11.

[0090] 4A, when the power generated by the solar power generation facility 10 exceeds the threshold power, it is determined that the solar power generation facility 10 has started power generation, and the wastewater DW stored in the storage tank 41 may be discharged onto the surface 11s of the solar power generation panel 11. In the power supply system 101, the surface 11s of the solar power generation panel 11 is cleaned with the wastewater DW regardless of whether the fuel cell facility 20 is operating or not.

[0091] 4B, when the temperature of the solar power generation panel 11 exceeds the threshold temperature, the wastewater DW stored in the storage tank 41 may be caused to flow onto the surface 11s of the solar power generation panel 11. In the power supply system 101, the solar power generation panel 11 is cooled by the wastewater DW regardless of whether the fuel cell equipment 20 is operating or not.

[0092] When the solar power generation facility 10 starts generating power or when the temperature of the solar power generation panel 11 exceeds a threshold temperature, a control signal may be transmitted from the solar power generation facility 10 to the control device 51. The control device 51 that receives the control signal may control the adjustment valve 42 and the pump 43. This may cause the wastewater DW to flow over the surface 11s of the solar power generation panel 11.

[0093] (Variation 2) 5, in a power supply system 102 in the second modification, the wastewater DW1 after flowing over the surface 11s of the solar power generation panel 11 is collected in a water collecting mechanism 14. The wastewater DW1 collected in the water collecting mechanism 14 is sent to a neutralization device 61.

[0094] When the wastewater DW comes into contact with air, it easily absorbs carbon dioxide in the air. Therefore, the wastewater DW1 after flowing over the surface 11s of the solar power generation panel 11 may be acidic. The neutralization device 61 neutralizes the acidic wastewater DW1. The wastewater DW2 after the neutralization may be discharged to the outside via the discharge path LO1.

[0095] (Variation 3) As shown in FIG. 6, in the power supply system 103 of the third variant example, at least one selected from the group consisting of wastewater DW and hot water C2 discharged from the fuel cell equipment 20 flows over the surface 11s of the solar power generation panel 11 of the solar power generation equipment 10, and the hot water C2 flows over the surface 30s of the storage battery equipment 30.

[0096] As a result, the hot water C2 heats the storage battery equipment 30. Also, the surface 11s of the photovoltaic power generation panel 11 is cleaned or cooled by the wastewater DW, and snow or ice on the surface 11s of the photovoltaic power generation panel 11 is melted by the hot water C2.

[0097] The drainage water DW may be caused to flow through a drainage path LD1 onto the surface 11s of the solar power generation panel 11. The hot water C2 may be caused to flow through a hot water path LC2 onto the surface 11s of the solar power generation panel 11, and may be caused to flow through a hot water path LC3 branching off from the hot water path LC2 onto the surface 30s of the battery equipment 30.

[0098] (Variation 4) As shown in Figure 7, in the power supply system 104 of variant example 4, wastewater DW discharged from the fuel cell equipment 20 flows over the surface 11s of the solar power generation panel 11 of the solar power generation equipment 10, and hot water C2 discharged from the fuel cell equipment 20 flows over the surface 30s of the storage battery equipment 30.

[0099] As a result, the surface 11s of the solar power generation panel 11 is cleaned or cooled by the wastewater DW, and the storage battery equipment 30 is heated by the hot water C2.

[0100] The drainage water DW may be caused to flow through a drainage path LD1 onto the surface 11s of the photovoltaic power generation panel 11. The hot water C2 may be caused to flow through a hot water path LC3 onto the surface 30s of the battery equipment 30.

[0101] (Variation 5) 8, in the power supply system 105 of the fifth modification, at least one selected from the group consisting of the wastewater DW and the hot water C2 discharged from the fuel cell equipment 20 descends due to its own weight and flows over the surface 11s of the solar power generation panel 11. The hot water C2 discharged from the fuel cell equipment 20 descends due to its own weight and flows over the surface 30s of the storage battery equipment 30 arranged below the fuel cell equipment 20.

[0102] As a result, the hot water C2 heats the battery equipment 30 without using power such as a pump. Also, the surface 11s of the photovoltaic panel 11 is cleaned or cooled by the wastewater DW, and snow or ice on the surface 11s of the photovoltaic panel 11 is melted by the hot water C2 without using power such as a pump.

[0103] [1-3. Effects, etc.] As described above, in this embodiment, the power supply systems 100, 101, 102, 103, 104, and 105 include a solar power generation equipment 10 including a solar power generation panel 11, and a fuel cell equipment 20, and at least one selected from the group consisting of wastewater DW generated by power generation in the fuel cell equipment 20 and hot water C2 from which heat generated by power generation in the fuel cell equipment 20 has been recovered flows over the surface 11s of the solar power generation panel 11.

[0104] This allows the surface 11s of the photovoltaic power generation panel 11 to be washed not with tap water but with wastewater DW generated by power generation by the fuel cell equipment 20, thereby preventing the adhesion of mineral components such as silicon and suppressing a decrease in the power generation efficiency of the photovoltaic power generation equipment 10. In addition, the hot water C2 that has recovered heat generated by power generation by the fuel cell equipment 20 can be used to melt snow or ice, thereby suppressing a decrease in the power generation efficiency of the photovoltaic power generation equipment 10.

[0105] In addition, this embodiment further includes a storage tank 41 for storing wastewater DW, and when the solar power generation equipment 10 starts generating power, the wastewater DW stored in the storage tank 41 may flow onto the surface 11s of the solar power generation panel 11.

[0106] As a result, the solar power generation panel 11 can be washed with the wastewater DW when the solar power generation facility 10 starts generating power, regardless of whether the fuel cell facility 20 is in operation or not.

[0107] In addition, this embodiment further includes a storage tank 41 for storing wastewater DW, and when the temperature of the solar power generation panel 11 exceeds a threshold temperature, the wastewater DW stored in the storage tank 41 may flow onto the surface 11s of the solar power generation panel 11.

[0108] As a result, regardless of whether the fuel cell equipment 20 is operating or not, the solar power generation panel 11 can be cooled by the drainage water DW during a time period when the temperature of the solar power generation panel 11 rises.

[0109] In this embodiment, the system may further include a water collecting mechanism 14 that collects the wastewater DW1 after it has flowed over the surface 11s of the solar power generation panel 11, and a neutralizing device 61 that neutralizes the wastewater DW1.

[0110] As a result, even if the wastewater DW1 is acidic, the wastewater DW1 collected by the water collecting mechanism 14 can be neutralized by the neutralization device 61.

[0111] In addition, in this embodiment, a storage battery equipment 30 may be further provided, and the hot water C2 may flow over the surface of the storage battery equipment 30.

[0112] As a result, even during periods when the outside air temperature is particularly low, such as in winter, the storage battery equipment 30 can be heated by the hot water C2 that has recovered heat generated by power generation by the fuel cell equipment 20. In addition, the surface 11s of the photovoltaic power generation panel 11 can be washed or cooled by the wastewater DW, and snow or ice on the surface 11s of the photovoltaic power generation panel 11 can be melted by the hot water C2.

[0113] In addition, in this embodiment, a storage battery equipment 30 may be further provided, in which the drainage water DW flows over the surface 11s of the photovoltaic power generation panel 11 and the hot water C2 flows over the surface 30s of the storage battery equipment 30.

[0114] As a result, the surface 11s of the photovoltaic power generation panel 11 can be washed or cooled by the wastewater DW, and the storage battery equipment 30 can be heated by the hot water C2.

[0115] In addition, in this embodiment, the fuel cell equipment 20 may be stacked on top of the storage battery equipment 30, and the solar power generation panel 11 may be arranged in front of the fuel cell equipment 20 and the storage battery equipment 30 with a downward slope.

[0116] As a result, the battery storage equipment 30 can be heated by the hot water C2 without using power such as a pump. Also, the surface 11s of the photovoltaic power generation panel 11 can be washed or cooled by the drainage water DW without using power such as a pump, and snow or ice on the surface 11s of the photovoltaic power generation panel 11 can be melted by the hot water C2.

[0117] (Other embodiments) As described above, the embodiments have been described as examples of the technology disclosed in this application. However, the technology in this disclosure is not limited to these, and can be applied to embodiments in which modifications, substitutions, additions, omissions, etc. are made. In addition, it is also possible to combine the components described in the above embodiments to create new embodiments.

[0118] For example, in the third modification of the above embodiment (FIG. 6), the wastewater and / or hot water after flowing over the surface 11s of the photovoltaic power generation panel 11 and the hot water after flowing over the surface 30s of the storage battery equipment 30 may be collected by a water collecting mechanism and then neutralized by a neutralization device. In the fourth modification of the above embodiment (FIG. 7), the wastewater after flowing over the surface 11s of the photovoltaic power generation panel 11 and the hot water after flowing over the surface 30s of the storage battery equipment 30 may be collected by a water collecting mechanism and then neutralized by a neutralization device.

[0119] Each of the drainage path LD1, the hot water path LC2, and other paths can be formed of one or more pipes. [Industrial Applicability]

[0120] The technology according to the present disclosure is applicable to a system that supplies electric power by linking photovoltaic power generation, fuel cells, and storage batteries. The technology according to the present disclosure is applicable to, for example, efforts to protect the environment, such as RE100 (Renewable Energy 100%). [Explanation of symbols]

[0121] 100, 101, 102, 103, 104, 105 Power supply system 10. Solar power generation facilities 11. Solar panels 11s surface 11a Upper end 11b Bottom end 12, 16 Surface flow channel 13 Power conversion equipment 14 Water collection mechanism 20 Fuel cell equipment 20b Bottom end 21 Fuel Cell Stack 22 Power conversion device 23 Heat exchanger 24 Exhaust heat recovery route 24a Part 1 24b Part 2 25 Refrigerant path 25a Part 1 25b Part 2 261, 262 Pumps 27 Tank 281, 282 Thermistor 30 Battery storage equipment 30s surface 30a Upper end 31, 32 Surface flow channel 41 Storage Tank 42 Control valve 43 Pump 51 Control device 61 Neutralization device LD1 Drainage route LC2 Hot water route LO1, LO2 excretion route DW Drainage DW1 Drainage after washing the surface 11s of the solar panel 11 C1 Refrigerant C2 Hot water F0 Fluid discharged from fuel cell stack 21 F1 Fluid cooled in heat exchanger 23 G1 Anode Gas G2 Cathode Gas

Claims

1. A solar power generation facility including a solar power generation panel; A fuel cell facility; Equipped with At least one selected from the group consisting of wastewater generated by power generation of the fuel cell equipment and hot water obtained by recovering heat generated by power generation of the fuel cell equipment flows over a surface of the solar power generation panel. Power supply system.

2. Further comprising a storage tank for storing the wastewater, When the solar power generation facility starts generating power, the wastewater stored in the storage tank flows onto the surface of the solar power generation panel. The power supply system according to claim 1 .

3. Further comprising a storage tank for storing the wastewater, When the temperature of the solar power generation panel exceeds a threshold temperature, the wastewater stored in the storage tank flows onto a surface of the solar power generation panel. The power supply system according to claim 1 .

4. a water collection mechanism that collects the wastewater after it has flowed over the surface of the solar panel; A neutralization device for neutralizing the wastewater; Further equipped with The power supply system according to claim 1 .

5. Further equipped with battery storage equipment, The hot water flows over the surface of the battery equipment. The power supply system according to claim 1 .

6. Further equipped with battery storage equipment, The drainage flows over the surface of the solar panel, The hot water flows over the surface of the battery equipment. The power supply system according to claim 1 .

7. The fuel cell equipment is stacked on top of the battery equipment, The solar power generation panel is arranged in front of the fuel cell equipment and the storage battery equipment with a downward slope. The power supply system according to claim 5 .

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