JP2017150738A - Cogeneration system - Google Patents

Abstract

An object of the present invention is to suppress freezing of hot water flowing inside a radiator cooled by a cooling fan in a cogeneration system and to relatively reduce the number of times the cooling fan is switched on and off. A fuel cell system (1) is provided between a radiator (22b) and a heat exchanger (12) in a hot water circulation path (22) through which hot water stored in a hot water tank (21) circulates, and a first temperature sensor for detecting the temperature of the hot water. 22c, a cooling fan 22b1 that cools the hot water flowing inside the radiator 22b, and a controller 15 that performs at least on / off control of the cooling fan 22b1 based on the first detected temperature of the first temperature sensor 22c. The off-switching temperature Toff at which a certain cooling fan 22b1 is switched off is set to a temperature higher than the temperature at which the hot water is frozen, and the on-switching temperature Ton at which the cooling fan 22b1 that is off is switched on is higher than the off-switching temperature Toff. The temperature is set. [Selection] Figure 1

Description

  The present invention relates to a cogeneration system.

  As one type of cogeneration system, those shown in Patent Document 1 and Patent Document 2 are known. The cogeneration systems of Patent Document 1 and Patent Document 2 include a fuel cell module including a fuel cell, a hot water tank for storing hot water, a circulation path for circulating hot water stored in the hot water tank, and a fuel provided in the circulation path. A heat exchanger that exchanges heat between the exhaust heat from the battery module and hot water from the hot water storage tank, a radiator through which hot water introduced from the hot water storage tank into the heat exchanger flows, and cooling that cools the radiator by outside air when it is on Has a fan.

JP 2014-229402 A Japanese Patent No. 5611712

In the cogeneration systems of Patent Document 1 and Patent Document 2 described above, freezing of hot water flowing through a radiator cooled by a cooling fan is conceivable, for example, when the temperature of outside air is relatively low during cold weather. In addition, there is a demand to reduce the number of times the cooling fan is switched on and off from the viewpoint of durability of the cooling fan.
The present invention has been made to solve the above-described problems. In a cogeneration system, the present invention suppresses freezing of hot water flowing inside a radiator cooled by a cooling fan, and switches the cooling fan on and off. The purpose is to reduce the number of times relatively.

  In order to solve the above-mentioned problems, a cogeneration system according to claim 1 includes a heat source device including a heat source unit that generates heat, a hot water storage tank for storing hot water, and hot water in which hot water stored in the hot water tank circulates. A circulation path, a circulation pump that is provided in the hot water circulation path, circulates hot water, a radiator that is provided in the hot water circulation path, and in which the hot water flows inside, and the hot water that is provided in the radiator and flows inside the radiator when it is on. A cooling fan that cools the air by outside air, a heating device that is provided in the hot water circulation path and that heats hot water from the radiator using exhaust heat from the heat source device, and a radiator and a heating device that are provided in the hot water circulation path. There are few temperature sensors that detect the temperature of hot water and on / off control that switches the cooling fan on and off based on the detected temperature detected by the temperature sensor. A cogeneration system having a control device that executes both, and an off-switching temperature that is a detected temperature at which a cooling fan that is on is switched off is set to a temperature that is higher than a temperature at which hot and cold water is frozen. An on-switching temperature, which is a detected temperature at which a certain cooling fan is switched on, is set to a temperature higher than the off-switching temperature.

  According to this, since the off-switching temperature, which is the detected temperature of the temperature sensor at which the cooling fan that is on, is switched off, is set to a temperature that is higher than the temperature at which the hot water is frozen, it is possible to suppress freezing of the hot water. it can. Further, the on-switching temperature, which is the detected temperature of the temperature sensor at which the cooling fan that is off, is switched on is set to a temperature higher than the off-switching temperature. That is, hysteresis is provided. Therefore, the number of times the cooling fan is switched on and off can be reduced as compared with the case where the on-switching temperature and the off-switching temperature are the same temperature.

It is the schematic which shows the outline | summary of one Embodiment of the cogeneration system by this invention. It is a block diagram of the cogeneration system shown in FIG. It is a figure which shows the action | operation of the cooling fan shown in FIG. It is a flowchart which the control apparatus shown in FIG. 2 performs.

  Hereinafter, an embodiment of a cogeneration system according to the present invention will be described. The cogeneration system of this embodiment is a fuel cell system. The fuel cell system 1 includes a power generation unit 10 and a hot water tank 21 as shown in FIG. The power generation unit 10 includes a housing 10a, a fuel cell module 11 (30), a heat exchanger 12, a power conversion device 13, a water tank 14, and a control device 15.

The fuel cell module 30 (corresponding to the heat source device of the present invention) includes a casing 31, an evaporation unit 32, a reforming unit 33, and a fuel cell 34. The casing 31 is formed in a box shape with a heat insulating material.
The fuel cell module 30 is connected to the evaporating unit 32 at the other end of a reforming material supply pipe 11a to which one end is connected to a supply source Gs and a reforming material is supplied. The supply source Gs is, for example, a gas supply pipe for city gas or a gas cylinder for LP gas. The reforming material supply pipe 11a is provided with a material pump 11a1. The raw material pump 11a1 is a pump that sends the raw material for reforming. Further, one end (lower end) is connected to the water tank 14 and the other end of the water supply pipe 11b to which the reforming water is supplied is connected to the evaporation unit 32. The water supply pipe 11b is provided with a reforming water pump 11b1 for feeding reforming water.

  Further, one end of the fuel cell module 30 is connected to the cathode air blower 11c1, and the other end of the cathode air supply pipe 11c to which cathode air that is an oxidant gas is supplied into the casing 31 is connected. The cathode air blower 11c1 is a pump that sends cathode air.

  The evaporation unit 32 generates water vapor from the reformed water. Specifically, the evaporation unit 32 is heated by a combustion gas to be described later, and evaporates the supplied reforming water to generate water vapor. The evaporation unit 32 preheats the supplied reforming raw material. The evaporation unit 32 mixes the steam generated in this way with the preheated reforming raw material and supplies the mixture to the reforming unit 33. The reforming raw materials include gas fuels for reforming such as natural gas and LP gas, and liquid fuels for reforming such as kerosene, gasoline, and methanol. In this embodiment, natural gas will be described.

  The reforming unit 33 generates reformed gas from the reforming raw material from the supply source Gs and the water vapor from the evaporation unit 32 and supplies the reformed gas to the fuel cell 34. Specifically, the reforming unit 33 is heated by a combustion gas, which will be described later, and supplied with heat necessary for the steam reforming reaction, so that the mixed gas (reforming raw material, water vapor) supplied from the evaporation unit 32 is supplied. ) To generate and derive the reformed gas. The reforming section 33 is filled with a catalyst (for example, Ru or Ni-based catalyst), and the reformed gas containing hydrogen gas and carbon monoxide is reformed by the reaction of the mixed gas by the catalyst. (So-called steam reforming reaction). The reformed gas contains hydrogen, carbon monoxide, carbon dioxide, steam, unreformed natural gas (methane gas), and reformed water (steam) that has not been used for reforming. The steam reforming reaction is an endothermic reaction.

  The fuel cell 34 generates power using fuel and oxidant gas. The fuel is a reformed gas. The fuel cell 34 is configured by laminating a fuel electrode, an air electrode (oxidant electrode), and a plurality of cells 34a made of an electrolyte interposed between the two electrodes. The fuel cell 34 of the present embodiment is a solid oxide fuel cell, and uses zirconium oxide, which is a kind of solid oxide, as an electrolyte. A reformed gas (hydrogen, carbon monoxide, methane gas, etc.) is supplied to the fuel electrode of the fuel cell 34 as fuel. A fuel channel 34b through which fuel (reformed gas) flows is formed on the fuel electrode side of the cell 34a. An air flow path 34c through which air (cathode air) that is an oxidant gas flows is formed on the air electrode side of the cell 34a. The fuel cell 34 generates power at a relatively high operating temperature (approximately 750 ° C. to 1000 ° C.).

  The fuel cell 34 is provided on the manifold 35. The reformed gas from the reforming unit 33 is supplied to the manifold 35 via the reformed gas supply pipe 38. The lower end (one end) of the fuel flow path 34b is connected to a fuel outlet (not shown) of the manifold 35 so that the reformed gas led out from the fuel outlet is introduced from the lower end and led out from the upper end. It has become. The cathode air sent out by the cathode air blower 11c1 is supplied via the cathode air supply pipe 11c, introduced from the lower end of the air flow path 34c, and led out from the upper end.

  A combustion unit 36 is provided between the fuel cell 34, the evaporation unit 32, and the reforming unit 33. In the combustion section 36, the anode off-gas (fuel off-gas) from the fuel cell 34 and the cathode off-gas (oxidant off-gas) from the fuel cell 34 are burned to generate combustion gas (flame 37). The combustion gas heats the evaporation unit 32 and the reforming unit 33. The combustion unit 36 is provided with a pair of ignition heaters 36a1 and 36a2 for igniting the anode off gas. In the combustion section 36, the anode off-gas is burned, and a relatively high-temperature combustion exhaust gas (corresponding to the exhaust gas of the present invention) is generated. The relatively high-temperature combustion exhaust gas is led to the heat exchanger 12. That is, the heat exchanger 12 is supplied with exhaust heat from the fuel cell module 30 by combustion exhaust gas. Further, the combustion unit 36 makes the temperature in the fuel cell module 30 the operating temperature of the fuel cell 34. As described above, the fuel cell 34 and the combustion unit 36 generate heat. The fuel cell 34 and the combustion part 36 correspond to the heat source part of the present invention.

  The hot water tank 21 stores hot water. Hot water stored in the hot water tank 21 is supplied to the hot water supply device 40 from the upper end of the hot water tank 21. The hot water supply device 40 uses hot water stored in the hot water storage tank 21 as hot water. The hot water supply device 40 is, for example, a bathtub, a shower, or a kitchen (kitchen faucet). When hot water is led out from the hot water storage tank 21 to the hot water supply device 40, the hot water storage tank 21 is supplied with water from the water source W from the lower end. The water source W is a water supply, for example.

  The hot water tank 21 is provided with a hot water circulation path 22 which is a pipe through which hot water stored in the hot water tank 21 circulates (circulates in the direction of the arrow in the figure). On the hot water circulation path 22, in order from the lower end to the upper end of the hot water tank 21, a circulation pump 22a, a radiator 22b, a first temperature sensor 22c (corresponding to a temperature sensor of the present invention), and a heat exchanger 12 (the present invention). And a second temperature sensor 22d are provided. An exhaust heat recovery system 20 is configured by the hot water storage tank 21, the hot water circulation path 22, the circulation pump 22a, the radiator 22b, the first temperature sensor 22c, the heat exchanger 12, and the second temperature sensor 22d. The exhaust heat recovery system 20 recovers and stores the exhaust heat of the fuel cell module 30 in hot water.

The circulation pump 22a is a pump that is provided in the hot water circulation path 22 and circulates hot water.
The radiator 22b is provided in the hot water circulation path 22, and hot water flows through the radiator 22b. The radiator 22b releases heat of hot water flowing inside. The radiator 22b is configured, for example, by meandering a pipe through which hot water flows. The radiator 22b is provided with a cooling fan 22b1.

  The cooling fan 22b1 is provided in the radiator 22b, and cools the hot water flowing inside the radiator 22b with outside air when it is on. Specifically, the cooling fan 22b1 is a blower that sucks outside air and discharges the sucked outside air. The cooling fan 22b1 is connected to a duct (not shown) communicating with the outside of the housing 10a, and sucks outside air through the duct. The cooling fan 22b1 is disposed on the radiator 22b so that the hot water flowing inside the radiator 22b is cooled by the outside air sucked by the cooling fan 22b1. The cooling fan 22b1 includes an impeller (not shown) and a motor (not shown) that rotates the impeller. The motor is a brushless motor.

The first temperature sensor 22c is provided between the radiator 22b and the heat exchanger 12 in the hot water circulation path 22 and detects the temperature of the hot water. The 1st temperature sensor 22c detects the temperature of the hot water of the arrange | positioned position.
The heat exchanger 12 is provided in the hot water circulation path 22 and heats hot water from the radiator 22 b using exhaust heat from the fuel cell module 30. Specifically, the heat exchanger 12 is a heat exchanger that exchanges heat between combustion exhaust gas including exhaust heat from the fuel cell module 30 and hot water from the hot water storage tank 21.

  The heat exchanger 12 is connected (through) the exhaust pipe 11d from the fuel cell module 30. One end of a condensed water supply pipe 12 a is connected to the heat exchanger 12. The heat exchanger 12 introduces combustion exhaust gas including exhaust heat from the fuel cell module 30 through the exhaust pipe 11d, and exhausts heat by exchanging heat with hot water supplied from the hot water storage tank 21. The hot water is heated by collecting the hot water, and the combustion exhaust gas is cooled. When the combustion exhaust gas is cooled, condensed water is generated by condensing water vapor in the combustion exhaust gas. The cooled combustion exhaust gas is discharged to the outside through the exhaust pipe 11d.

On the other hand, the condensed water generated in the heat exchanger 12 is supplied to the water tank 14 through the condensed water supply pipe 12a. The water tank 14 purifies the condensed water with an ion exchange resin and stores it as reformed water. Thus, when the combustion exhaust gas is cooled by the heat exchanger 12, the fuel cell system 1 uses the condensed water generated by condensing the water vapor contained in the combustion exhaust gas as the reformed water.
The second temperature sensor 22 d is provided in the hot water circulation path 22 and detects the temperature of the hot water heated by the heat exchanger 12. The 2nd temperature sensor 22d detects the temperature of the hot water of the arrange | positioned position.

  The power conversion device 13 receives the DC voltage output from the fuel cell 34, converts it into a predetermined AC voltage, and supplies it to a power supply line 16b connected to an AC system power supply 16a and a load device 16c (for example, an electrical appliance). Output. In addition, the power conversion device 13 receives an AC voltage from the system power supply 16a via the power supply line 16b, converts it into a predetermined DC voltage, and converts each auxiliary machine (each pump, blower, etc.) and the control device 15 (internal load). ).

  The control device 15 controls the operation of the fuel cell system 1 by driving an auxiliary machine. As shown in FIG. 2, the control device 15 is connected to a first temperature sensor 22c and a cooling fan 22b1. In addition, the control device 15 includes a cooling fan control unit 15a.

  The cooling fan control unit 15a performs on / off control for switching the cooling fan 22b1 on and off based on a first detected temperature (corresponding to a detected temperature of the present invention) that is a temperature detected by the first temperature sensor 22c. To do. The cooling fan control unit 15a acquires the first detected temperature of the first temperature sensor 22c. As shown in FIG. 3, when the cooling fan 22b1 is on and the first detected temperature decreases to the off switching temperature Toff, the cooling fan control unit 15a switches the cooling fan 22b1 off (FIG. 3). (Refer to thick broken line 3). The off switching temperature Toff is set to a temperature higher than the temperature at which the hot water is frozen. When the hot water is frozen, the temperature of the water from the water source W and the outside air temperature are relatively low, respectively, so that the temperature of the hot water in the hot water tank 21 and the temperature of the hot water flowing through the radiator 22b are relatively low, and cooling is performed. This is a case where the temperature of the outside air sucked by the fan 22b1 is relatively low. The off switching temperature Toff is, for example, 10 ° C.

  On the other hand, when the cooling fan 22b1 is off, when the first detection temperature rises and the first detection temperature becomes the on-switching temperature Ton, the cooling fan controller 15a switches the cooling fan 22b1 on (FIG. 3). (See thick solid line). The on switching temperature Ton is set to a temperature higher than the off switching temperature Toff. That is, a hysteresis is provided between the off switching temperature Toff and the on switching temperature Ton.

  The on-switching temperature Ton is set to a hot water temperature at which the amount of condensed water generated by the heat exchanger 12 is larger than the amount of condensed water used as reforming water. The on-switching temperature Ton is 30 ° C., for example. In the exhaust heat recovery system 20, the temperature is controlled so that the second detected temperature detected by the second temperature sensor 22d, which is the temperature of the hot water heated by the heat exchanger 12, becomes a predetermined temperature (described later). ). When the first detection temperature is relatively high, the temperature difference between the first detection temperature and the second detection temperature is relatively small, that is, the temperature of the hot water introduced into the heat exchanger 12 is heated by the heat exchanger 12. When the temperature difference from the temperature of the hot water is relatively small, in the heat exchanger 12, the temperature rise of the hot water is relatively small and the temperature drop of the combustion exhaust gas is relatively small. In this case, since the temperature drop of water vapor in the combustion exhaust gas is relatively small, the amount of condensed water generated in the heat exchanger 12 is relatively small. Based on this knowledge, the temperature of the hot water introduced into the heat exchanger 12 is set so that the amount of condensed water generated in the heat exchanger 12 is equal to or greater than the amount of reformed water used in the evaporator 32. Is set so that the cooling fan 22b1 is turned on.

  Thus, the off switching temperature Toff, which is the first detection temperature at which the cooling fan 22b1 that is on, is switched off is set to a temperature that is higher than the temperature at which the hot and cold water freezes. The on-switching temperature Ton that is the first detection temperature at which the cooling fan 22b1 that is off is switched on is set to a temperature that is higher than the off-switching temperature Toff.

  Next, an example of the basic operation of the above-described fuel cell system 1 will be described. When the fuel cell system 1 is powered on, the control device 15 starts the start operation when the start switch (not shown) is pressed to start the operation or when the operation starts according to the planned operation. To do.

  When the start-up operation is started, the control device 15 operates the auxiliary machine. Specifically, the control device 15 operates the pumps 11a1 and 11b1 and starts supplying the raw material for reforming and the reforming water (condensed water) to the evaporation unit 32. In the combustion section 36, the reforming raw material and the reformed gas derived from the fuel cell 34 are ignited by the ignition heaters 36a1 and 36a2. When the fuel cell 34 reaches approximately the operating temperature, the start-up operation is terminated and the power generation operation is started.

  During the power generation operation, the control device 15 supplies the reformed gas and cathode air to the fuel cell 34 by controlling the auxiliary equipment so that the power generated by the fuel cell 34 becomes the power consumption of the load device 16c. Further, during the power generation operation, the control device 15 controls the drive amount of the circulation pump 22a so that the second detected temperature of the second temperature sensor 22d becomes a predetermined temperature (for example, 65 ° C.). As described above, the second temperature sensor 22d detects the temperature of the hot water heated by recovering the exhaust heat from the fuel cell module 30 by the heat exchanger 12. Therefore, when the flow rate of the hot water flowing through the heat exchanger 12 decreases, the amount of heat recovered by the hot water increases, and the second detected temperature of the second temperature sensor 22d increases. On the other hand, when the flow rate of the hot water flowing through the heat exchanger 12 increases, the amount of heat recovered by the hot water decreases, so the second detected temperature of the second temperature sensor 22d decreases. The flow rate of hot water flowing through the heat exchanger 12 can be controlled by the driving amount of the circulation pump 22a. Therefore, the control device 15 controls the feedback amount (driving amount of the circulation pump 22a) to the circulation pump 22a based on the difference between the second detection temperature and the predetermined temperature so that the second detection temperature becomes the predetermined temperature. Derived as a value and output to the circulation pump 22a.

Next, the on / off control of the cooling fan 22b1 in the fuel cell system 1 described above will be described with reference to the flowchart shown in FIG. 4 from the state where the cooling fan 22b1 is off.
In step S102, the control device 15 determines whether or not the first detected temperature is equal to or higher than the on-switching temperature Ton. Since the temperature of the hot water stored in the hot water storage tank 21 is relatively low, and the temperature of the hot water flowing through the radiator 22b is relatively low, when the first detection temperature is lower than the on-switching temperature Ton, the control device 15 In step S102, “NO” is determined, and step S102 is repeatedly executed. On the other hand, as the hot water is heated by the heat exchanger 12 and the temperature of the hot water stored in the hot water storage tank 21 is increased, the temperature of the hot water flowing inside the radiator 22b is increased. When it becomes more than Ton, the control apparatus 15 determines with "YES" in step S102, and turns on the cooling fan 22b1 in step S104 (cooling fan control part 15a). Thereby, the temperature of the hot water flowing through the radiator 22b is lowered.

  Subsequently, in step S106, the control device 15 determines whether or not the first detected temperature is equal to or lower than the off-switching temperature Toff. When the first detection temperature is higher than the on-switching temperature Ton due to the relatively high temperature of the hot water flowing inside the radiator 22b, the control device 15 determines “NO” in step S106, and repeatedly executes step S106. To do. On the other hand, when the first detected temperature is equal to or lower than the on-switching temperature Ton as a result of the temperature of the hot water flowing inside the radiator 22b being lowered by the cooling fan 22b1, the control device 15 determines “YES” in step S106. And the control apparatus 15 turns off the cooling fan 22b1 in step S108 (cooling fan control part 15a), and returns a program to step S102.

According to this embodiment, the fuel cell system 1 includes a fuel cell module 30 including a fuel cell 34 that generates heat and a combustion unit 36, a hot water storage tank 21 that stores hot water, and hot water stored in the hot water storage tank 21. Is provided in the hot water circulation path 22 through which the water circulates, the circulation pump 22a for circulating hot water, the radiator 22b in the hot water circulation path 22 through which hot water flows, and the radiator 22b. , The cooling fan 22b1 that cools the hot water flowing inside the radiator 22b by the outside air, and the heat exchange that is provided in the hot water circulation path 22 and heats the hot water from the radiator 22b using the exhaust heat from the fuel cell module 30. The first temperature sensor that is provided between the radiator 12 and the radiator 22b in the hot water circulation path 22 and the heat exchanger 12 and detects the temperature of the hot water. It includes a 22c, and a control unit 15 for performing at least the on-off control based on the first detection temperature detected by the first temperature sensor 22c switches between on and off of the cooling fan 22 b 1, a. The off-switching temperature Toff, which is the first detection temperature at which the cooling fan 22b1 that is on is switched off, is set to a temperature that is higher than the temperature at which the hot water is frozen, and the first detection temperature at which the cooling fan 22b1 that is off is switched on. The on switching temperature Ton is set to a temperature higher than the off switching temperature Toff.
According to this, since the off switching temperature Toff, which is the first detected temperature of the first temperature sensor 22c at which the cooling fan 22b1 that is on is switched off, is set to a temperature that is higher than the temperature at which the hot water is frozen, Can be prevented from freezing. Further, the on-switching temperature Ton that is the first detected temperature of the first temperature sensor 22c at which the cooling fan 22b1 that is off is switched on is set to a temperature that is higher than the off-switching temperature Toff. That is, hysteresis is provided. Therefore, compared with the case where the on switching temperature Ton and the off switching temperature Toff are the same temperature, the number of times the cooling fan 22b1 is switched on and off can be reduced.

  The heat source unit of the present invention is a fuel cell 34 that generates power using fuel and oxidant gas. The heat source device of the present invention includes a fuel cell 34, an evaporation unit 32 that generates water vapor from reformed water, and a supply. The fuel cell module 30 includes a reforming unit 33 that generates fuel from the reforming raw material from the source and the water vapor from the evaporation unit 32 and supplies the fuel to the fuel cell 34.

Further, the heat exchanger 12 heats the hot water by cooling the exhaust gas while the exhaust gas containing the exhaust heat from the fuel cell module 30 is introduced, and the exhaust heat is recovered by the hot water. When the combustion exhaust gas is cooled by the heat exchanger 12, the fuel cell system 1 uses condensed water generated by condensing water vapor contained in the combustion exhaust gas as reformed water. The on-switching temperature Ton is set to a hot water temperature at which the amount of condensed water generated by the heat exchanger 12 is larger than the amount of condensed water used as reforming water.
According to this, the quantity of the condensed water produced | generated by the heat exchanger 12 becomes larger than the quantity of the condensed water utilized as reforming water. Therefore, the fuel cell system 1 can perform water self-sustained operation that does not require external water supply.

  In the above-described embodiment, an example of a cogeneration system has been shown. However, the present invention is not limited to this, and other configurations can be adopted. For example, although the power generation unit 10 of the above-described cogeneration system uses the fuel cell 34, an internal combustion engine such as a gas engine may be used instead. In this case, an internal combustion engine such as a gas engine corresponds to the heat source device of the present invention, and a combustion part (combustion chamber) of the internal combustion engine such as a gas engine corresponds to the heat source part of the present invention.

In the embodiment described above, the hot water stored in the hot water storage tank 21 is heated by the heat exchanger 12, but instead of this, the hot water may be heated by a heater using a heater or the like. good.
Further, the temperature of the predetermined temperature, the on-switching temperature Ton, and the off-switching temperature Toff may be changed without departing from the gist of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Fuel cell system (cogeneration system), 10 ... Power generation unit, 11 (30) ... Fuel cell module (heat source device), 12 ... Heat exchanger (heating device), 15 ... Control device, 15a ... Cooling fan control part , 20 ... Waste heat recovery system, 21 ... Hot water storage tank, 22 ... Hot water circulation path, 22a ... Circulation pump, 22b ... Radiator, 22b1 ... Cooling fan, 22c ... First temperature sensor (temperature sensor), 22d ... Second temperature sensor 32 ... evaporation part, 33 ... reforming part, 34 ... fuel cell (heat source part), 36 ... combustion part (heat source part), Gs ... supply source, Toff ... off switching temperature, Ton ... on switching temperature.

Claims (3)

A heat source device including a heat source unit for generating heat;
A hot water storage tank for storing hot water,
A hot water circulation path through which the hot water stored in the hot water tank circulates;
A circulation pump provided in the hot water circulation path for circulating the hot water;
A radiator provided in the hot water circulation path, in which the hot water flows;
A cooling fan that is provided in the radiator and, when it is on, cools the hot water flowing inside the radiator by outside air;
A heating device that is provided in the hot water circulation path and heats the hot water from the radiator using exhaust heat from the heat source device;
A temperature sensor provided between the radiator and the heating device in the hot water circulation path to detect the temperature of the hot water;
A control device that executes at least on / off control for switching on and off of the cooling fan based on a detected temperature detected by the temperature sensor,
The off-switching temperature that is the detected temperature at which the cooling fan that is on is switched off is set to a temperature that is higher than the temperature at which the hot water is frozen,
An on-switching temperature that is the detected temperature at which the cooling fan that is off is switched on is set to a temperature that is higher than the off-switching temperature. The heat source unit is a fuel cell that generates power with fuel and an oxidant gas,
The heat source device generates the fuel from the fuel cell, an evaporation unit that generates steam from reformed water, a reforming raw material from a supply source, and the steam from the evaporation unit, and supplies the fuel cell to the fuel cell. The cogeneration system according to claim 1, which is a fuel cell module comprising a reforming unit to be supplied. The heating device introduces exhaust gas containing the exhaust heat from the heat source device, heats the hot water by causing the hot water to recover the exhaust heat, and cools the exhaust gas,
When the exhaust gas is cooled by the heating device, the cogeneration system uses condensed water generated by condensation of water vapor contained in the exhaust gas as the reformed water,
The on-switching temperature is set to a temperature of the hot water at which the amount of the condensed water generated by the heating device is larger than the amount of the condensed water used as the reforming water. Cogeneration system.

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