JP2007048654A - Power generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power generator capable of simplifying piping construction work and reducing construction cost. <P>SOLUTION: This device has a reformer 38 to steam reform hydrocarbon fuel gas, a fuel cell 1 to generate power by using the fuel gas and oxidizer gas supplied from the reformer 38, a water treatment device 10 to purify pure water to be used for steam reforming in the reformer 38, a heat exchanger 5 in order to recover exhaust heat of the fuel cell 1, and a hot-water tank 6 to store the hot water, and in the water treatment device 10, a water supply piping 15 to supply water to the water treatment device 10 and an exhaust water piping 35 to exhaust water after water treatment from the water treatment device 10 are connected, the heat exchanger 5 and the hot-water tank 6 are coupled by a circulation piping 7, and the water supply piping 15 and/or the exhaust water piping 35 connected to the water treatment device 10 are coupled to the circulation piping 7. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a reformer for steam reforming a hydrocarbon-based raw fuel gas, a fuel cell for generating electric power, a water treatment device for purifying pure water used for steam reforming in the reformer, and a fuel cell. The present invention relates to a power generator having a heat exchanger for recovering the exhaust heat of the water and a hot water storage tank for storing hot water.

  As shown in FIG. 3, a conventional power generator using a solid oxide fuel cell includes a solid oxide fuel cell 1, a fuel supply device 2 for supplying natural gas or the like to the fuel cell 1, and an oxidant. An air supply device 3 for supplying air as gas to the fuel cell 1, a fuel humidifier 4 for humidifying natural gas supplied to the fuel cell 1, and a water treatment device 10 for supplying pure water to the fuel humidifier 4 It has. Connected to the water treatment apparatus 10 are a pure water supply pipe 15 for supplying pure water, a pure water supply pipe 30 for supplying purified pure water to the fuel humidifier 4, and a water treatment apparatus. 10 is connected to a drain pipe 35 for discharging concentrated water after water treatment.

  The fuel humidifier 4 is connected to a reformer 37 for reforming raw fuel gas such as humidified natural gas.

  The water treatment device 10 supplies treated water to the fuel humidifier 4 almost at the time of power generation, and always drains concentrated water after water treatment (see, for example, Patent Document 1).

  The fuel cell 1 is connected to a heat exchanger 5 for exchanging heat generated by power generation to hot water, and the heat exchanger 5 is connected to a circulation pipe 7 for circulating water in the hot water storage tank 6. The circulation pipe 7 is provided with a circulation pump 8 for forcibly circulating the water in the circulation pipe 7 to the heat exchanger 5. One end of the circulation pipe 7 is connected to the bottom of the hot water storage tank 6, and the other end is connected to the upper part of the hot water storage tank 6, and the water at the bottom of the hot water storage tank is returned to the upper part of the hot water storage tank 6 through the heat exchanger 5.

The fuel cell 1 generates heat with power generation, but most of the generated heat is used to maintain the temperature of the fuel cell 1 itself, and the remaining heat passes through a circulation pipe 7 in the heat exchanger 5. The heated water is exchanged with the water to be recovered, and the heated water is collected in the hot water storage tank 6 (see, for example, Patent Document 2).
JP 2002-280031 A JP 2002-134143 A

  However, since the pure water supply pipe 15 for supplying the pure water to the water treatment apparatus 10 is provided separately from the water supply pipe from the water source to the hot water storage tank 6, the pipe becomes complicated and construction is difficult. There was a problem of increased costs.

  Moreover, it is necessary to extend the drainage pipe 35 for draining the concentrated water (water that has not been purified) after the water treatment by the water treatment apparatus 10 to the outside of the fuel cell, and the pipe becomes complicated. There was a problem that the construction cost increased.

  An object of this invention is to provide the electric power generating apparatus which can simplify piping construction and reduce construction cost.

  The power generation device of the present invention includes a reformer that performs steam reforming of a hydrocarbon-based raw fuel gas, a fuel cell that generates power using the fuel gas and oxidant gas supplied from the reformer, and the reformer A water treatment device for purifying pure water used for steam reforming, a heat exchanger for recovering exhaust heat from the fuel cell, and a hot water storage tank for storing hot water, and the water treatment device , A water supply pipe for supplying water to the water treatment apparatus, a pure water supply pipe for supplying purified pure water, and waste water after water treatment that has not been purified to pure water from the water treatment apparatus A drainage pipe for discharging is connected, the heat exchanger and the hot water storage tank are connected by a circulation pipe, and a water supply pipe and / or a drainage pipe connected to the water treatment device is connected to the circulation pipe. It is characterized by being connected.

  In such a power generation device, since at least one of the water supply piping and drainage piping of the water treatment device is connected to the circulation piping, the piping is simpler than the conventional piping structure that is piped from the outside or outside. It is possible to achieve downsizing and construction costs can be greatly reduced.

  That is, when the water supply pipe of the water treatment apparatus is connected to the circulation pipe, the water that is supplied to the hot water storage tank and flows through the circulation pipe can be supplied to the water treatment apparatus through the water supply pipe, from the water source to the hot water storage tank. Since only one water supply path is required, piping is simplified and construction costs can be greatly reduced. In addition, when connecting the drainage pipe of the water treatment device to the circulation pipe, it is not necessary to extend the drainage pipe to the outside of the fuel cell as in the past, so the piping is simplified and construction costs can be greatly reduced. In addition, waste of water resources can be eliminated.

  That is, conventionally, concentrated water after water treatment by a water treatment device (water that could not be purified to pure water) has been discarded to the outside as drainage by a drainage pipe. For example, in the case of a 1 kW class fuel cell, the fuel is To humidify, 1 L / h of treated water is required, and about 2 L / h of water is thrown away to obtain this amount of treated water. When generating power for 15 hours a day, the amount of water discarded is about 30 It became a liter and was very useless. In the present invention, since the drainage pipe of the water treatment apparatus is connected to the circulation pipe, the water that has not been purified into pure water is supplied to the hot water storage tank without being discarded to the outside and reused. Can be used.

  Further, in the power generator according to the present invention, the circulation pipe includes an outward circulation pipe that connects the bottom of the hot water storage tank and the heat exchanger, and a return circulation pipe that connects the heat exchanger and the upper part of the hot water storage tank. And having a circulation pump in the middle of the forward circulation pipe, and connecting the water supply pipe of the water treatment device to the forward circulation pipe between the circulation pump and the heat exchanger. In such a power generation device, water can be forcibly supplied to the water treatment device at a certain pressure by the circulation pump, and the pure water purification efficiency by the water treatment device can be improved.

  Furthermore, in the power generator according to the present invention, the circulation pipe includes an outward circulation pipe that connects the bottom of the hot water storage tank and the heat exchanger, and a return circulation pipe that connects the heat exchanger and the hot water storage tank upper part. The drainage pipe of the water treatment apparatus is connected to the return circulation pipe. In general, in a heat exchanger, the water supply pipe is thin and long, and the pressure loss increases, so that the pressure on the downstream side (return circulation pipe) is lower than that on the upstream side (outward circulation pipe). By connecting the drain pipe to the return circulation pipe having such a low pressure, drainage can be performed smoothly.

  In the power generation device of the present invention, when the temperature of the water supplied to the water treatment device becomes equal to or higher than a predetermined temperature, the hot water in the hot water storage tank is discharged, and the temperature of the water supplied by the water supply pipe is predetermined. It has the control apparatus which carries out operation control so that it may become below temperature. For example, when the temperature of the water detected by the temperature detector that detects the inlet water temperature of the heat exchanger is equal to or higher than a predetermined temperature, the temperature of the water supplied to the water treatment device is equal to or higher than the predetermined temperature. The hot water in the hot water storage tank is discharged, and operation control is performed so that the temperature of the water introduced into the water treatment device is equal to or lower than a predetermined temperature.

  Since the water treatment apparatus uses a reverse osmosis membrane which is a polymer membrane, there is a weak point that the water temperature of the treated water is destroyed when the temperature of the treated water becomes high. For this reason, when the inlet water temperature of the heat exchanger in the apparatus is, for example, 40 ° C. or more, the hot water in the hot water storage tank is discharged, so that cold hot water is supplied to the lower part of the hot water storage tank. It will be supplied to the water treatment apparatus through the water supply pipe branched from the circulation pipe, so that the reverse osmosis membrane can be protected and the reliability of the water treatment apparatus can be improved.

  Furthermore, the power generation device of the present invention operates the circulation pump when the temperature of the water in the water supply pipe of the water treatment device is equal to or lower than a predetermined temperature, and causes the water in the hot water storage tank to flow through the water supply pipe. A control device that controls the operation to stop the operation of the circulation pump when the temperature of the water in the water supply pipe of the water treatment device is equal to or higher than a predetermined temperature is supplied to the treatment device to prevent freezing. To do. For example, when the temperature of the water detected by the temperature detector that detects the inlet water temperature of the heat exchanger becomes a predetermined temperature or lower, the temperature of the water in the water supply pipe of the water treatment device becomes lower than the predetermined temperature. Operate and circulate the water in the hot water storage tank to the water treatment device to prevent freezing, and stop the circulation pump when the temperature detected by the temperature detector that detects the inlet water temperature of the heat exchanger exceeds the specified temperature Control the operation.

  The power generation device may be stopped due to maintenance or the like when installed and stopped after trial operation until actual use, or when the night operation is suspended. When the power generation is stopped in winter, the water in the water treatment apparatus is frozen, and the water treatment apparatus may be damaged and the power generation apparatus itself may be damaged. In order to prevent this, when the temperature detector that detects the lowest temperature in the device, for example, the temperature detector that detects the inlet water temperature of the heat exchanger detects 4 ° C. or less, it does not operate the entire power generator but only the circulation pump. Freezing can be prevented by operating and circulating the water in the water treatment device.

  According to the power generator of the present invention, the construction can be simplified by connecting the water supply pipe and drain pipe of the water treatment apparatus necessary for driving the fuel cell to the circulation pipe in the power generator. The construction cost can be greatly reduced.

  Embodiments according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a power generator according to the present invention. In FIG. 1, components having the same functions as those of the conventional power generator shown in FIG. 3 are given the same reference numerals. The description will be omitted because it conforms to FIG.

  That is, the power generator includes a reformer 38 for steam reforming the hydrocarbon-based raw fuel gas, a fuel cell 1 for generating electric power using the fuel gas and the oxidant gas supplied from the reformer 38, A water treatment device 10 for purifying pure water used for steam reforming in the reformer 38, a heat exchanger 5 for recovering exhaust heat from the fuel cell 1, and a hot water storage tank 6 for storing hot water are provided. The heat exchanger 5 and the hot water storage tank 6 are connected by a circulation pipe 7.

  The reformer 38 is housed in a case housing the fuel cell 1 and is heated by the heat of the fuel cell 1 to reform the raw fuel gas.

  In FIG. 1, reference numeral 11 denotes an inlet temperature detector that detects the inlet water temperature of the heat exchanger 5, reference numeral 12 denotes an outlet temperature detector that detects the outlet water temperature of the heat exchanger 5, and reference numeral 13 denotes a fuel cell. It is a control apparatus which controls the pump output required in order to collect | recover the exhaust heat generated according to the electric power generation amount of 1. Reference numeral 14 denotes a tank temperature detector that detects the water temperature of the hot water storage tank 6.

  In the power generation apparatus of the present invention, the water treatment apparatus 10 includes a water supply pipe 15 for supplying water to the water treatment apparatus 10 and a pure water supply pipe for supplying purified pure water to the fuel humidifier 4. 30 and a drainage pipe 35 for discharging wastewater after water treatment that has not been purified to pure water from the water treatment apparatus 10 is connected. A water supply pipe 15 of the water treatment apparatus 10 is connected to the circulation pipe 7. The drain pipe 35 is extended outside.

  That is, the circulation pipe 7 includes an outward circulation pipe 7 a that connects the bottom of the hot water storage tank 6 and the heat exchanger 5, and a return circulation pipe 7 b that connects the heat exchanger 5 and the upper part of the hot water storage tank 6. 7 a has a circulation pump 8, and the water supply pipe 15 of the water treatment device 10 is connected to the forward circulation pipe 7 a between the circulation pump 8 and the heat exchanger 5. Exhaust gas from the fuel cell 1 is introduced into the heat exchanger 5, and water in the hot water storage tank 6 is introduced through the outward circulation pipe 7a to perform heat exchange.

  Further, when the temperature of the water supplied to the water treatment device 10 is equal to or higher than the predetermined temperature, the control device 13 releases hot water in the hot water storage tank 6 and the temperature of the water supplied through the water supply pipe 15 is lower than the predetermined temperature. Control the operation so that

  That is, since the water treatment apparatus 10 is composed of a polymer film, the water treatment apparatus 10 deteriorates and eventually breaks at high temperatures. Therefore, it is necessary to always supply water at a low temperature, for example, 40 ° C. or lower. Therefore, when the temperature of the water detected by the temperature detector 11 that detects the inlet water temperature of the heat exchanger 5 becomes a predetermined temperature, for example, 40 ° C. or higher, the temperature of the water supplied to the water treatment device 10 is, for example, 40 ° C. or higher. Assuming that, the hot water in the hot water storage tank 6 is discharged. Then, cold water from the water source is supplied to the lower part of the hot water storage tank 6, and cold water is supplied to the water treatment device 10 through the circulation pipe 7.

  On the other hand, when the temperature of the water detected by the temperature detector 11 that detects the inlet water temperature of the heat exchanger 5 becomes a predetermined temperature, for example, 40 ° C. or less, the discharge of hot water in the hot water storage tank 6 is stopped. In this way, operation control is performed so that the temperature of the water introduced into the water treatment apparatus 10 is equal to or lower than a predetermined temperature.

  This control works only when the water temperature in the hot water storage tank 6 reaches a high temperature. Therefore, normally, the hot water is hardly discharged. On the other hand, when hot water is often discharged, an auxiliary tank for accumulating the discharged hot water may be provided in addition to the hot water storage tank 6. In this case, resources can be used more effectively.

  By performing such control, the performance of the water treatment apparatus 10 can be maintained and the reliability can be improved.

  Furthermore, when the temperature of the water in the water supply pipe 15 of the water treatment device 10 is equal to or lower than a predetermined temperature in the power generation stop state, the control device 13 operates only the circulation pump 8 instead of the entire power generation device, and the hot water storage tank The warm water in 6 is supplied to the water treatment device 10 through the water supply pipe 15 to prevent freezing. When the temperature of the water in the water supply pipe 15 of the water treatment device 10 exceeds a predetermined temperature, the circulation pump 8 is operated. Control the operation to stop.

  That is, the power generation device may be stopped for maintenance when it is installed and stopped until actual use, when it is stopped at night, when it is not used for a long time, or when it is stopped. If such a situation occurs in winter, the accumulated water in the water treatment apparatus 10 freezes in a cold region, and not only the expensive water treatment apparatus 10 is damaged but also the power generation apparatus itself may be damaged. In order to prevent this, when the temperature detector 11 for detecting the inlet water temperature of the heat exchanger 5 detects a temperature of 4 ° C. or less in a place where the temperature is lowest in the apparatus, for example, in the water supply pipe 15 of the water treatment apparatus 10 Assuming that the temperature of the water is below the freezing temperature, the circulating pump 8 is operated to circulate hot water in the hot water storage tank 6 into the water treatment device 10 even though the power generation device is stopped. Then, when the temperature detector 11 that detects the inlet water temperature of the heat exchanger 5 detects, for example, 10 ° C. or more, control is performed to stop the circulation pump 8. By this control, freezing can be prevented without using an electric heater or the like.

  Although it is desirable that the fuel cell 1 and the hot water storage tank 6 be accommodated in one case in terms of compactness, the fuel cell 1 and the hot water storage tank 6 may be accommodated in separate cases.

  Next, the operation and action of the power generator of the present invention will be described. In the operation of the power generation apparatus, a hydrocarbon-based raw fuel gas such as natural gas, which becomes fuel, is supplied to the humidifier 4 and the reformer 38 by the fuel supply device 2, and the raw fuel gas is steamed by the reformer 38. The reformed fuel gas is supplied to the power generation element of the fuel cell 1. Further, an oxidant gas is supplied to the fuel cell 1 by the air supply device 3.

  First, fuel gas is combusted inside the fuel cell 1, and the fuel cell 1 itself is heated to a temperature at which power can be generated by the combustion heat. When a predetermined temperature is reached, pure water purified by the water treatment device 10 is supplied to the fuel humidifier 4, and hydrogen is extracted from natural gas or the like by steam reforming in the reformer 38, and is used as a power generation element of the fuel cell 1. The power is supplied and power generation is started, and the temperature of the fuel cell 1 is maintained by the heat generated by the power generation. Furthermore, the heat generated by the power generation is excessive and is released to the outside as exhaust heat. The exhaust heat (exhaust gas) is guided to the heat exchanger 5 through the exhaust pipe 9, and heat is transferred to the water circulating in the circulation pipe 7 through the heat exchanger 5.

  When the tank water temperature detected by the tank temperature detector 14 is less than the upper limit value of the hot water storage operation temperature, the control device 13 outputs the output of the circulation pump 8 to recover the exhaust heat according to the amount of power generated by the fuel cell 1. To control. That is, when the amount of power generated by the fuel cell is large, the water supply amount by the circulation pump 8 is increased, the heat exchange by the heat exchanger 5 is actively performed, the raw fuel gas is increased, and the water treatment device 10 is increased. The amount of purified water is increased, the amount of purified water is increased, the amount of humidification of the raw fuel gas is increased, and reforming to hydrogen is activated.

  At this time, the water treatment apparatus 10 is supplied with water at the bottom of the hot water storage tank 15 through the pure water supply pipe 15 through the addition of the hot water storage pressure of the hot water storage tank 6 and the discharge pressure of the circulation pump 8. The water treatment apparatus 10 is configured by using an expensive filter, activated carbon, and reverse osmosis membrane. Purified pure water is transferred to the fuel humidifier 4 and subjected to steam reforming by the reformer 38. . On the other hand, condensed water after water treatment is drained from the drain pipe 35 from the reverse osmosis membrane.

  By adopting such a configuration, the water supply pipe 15 for pure water is attached in advance in the power generator, so that it is not necessary to newly construct the water supply pipe 15 when installing the apparatus, and the construction is simplified. , Construction costs can be reduced.

  FIG. 2 shows another power generation apparatus of the present invention. In this power generation apparatus, water supply pipe 15 for supplying water to the water treatment apparatus 10 and water after water treatment are discharged from the water treatment apparatus 10. The water supply pipe 15 and the drain pipe 36 of the water treatment apparatus 10 are connected to the circulation pipe 7.

  That is, the circulation pipe 7 includes an outward circulation pipe 7 a that connects the bottom of the hot water storage tank 6 and the heat exchanger 5, and a return circulation pipe 7 b that connects the heat exchanger 5 and the upper part of the hot water storage tank 6. 7 a has a circulation pump 8, the water supply pipe 15 of the water treatment device 10 is connected to the forward circulation pipe 7 a between the circulation pump 8 and the heat exchanger 5, and the drain pipe 36 is connected to the heat exchanger 5. And a return circulation pipe 7b between the hot water storage tank 6 and the hot water storage tank 6.

  In this case, since the water supply pipe 15 and the drain pipe 36 are connected to the circulation pipe 7, it is desirable to provide a drain pump 39 in the drain pipe 36 when the discharge pressure of the circulation pump 8 is insufficient.

  Such a power generator has the same effect as that of the power generator of FIG. 1, but further, since not only the water supply pipe 15 but also the drain pipe 36 is connected to the circulation pipe 7, the drain pipe is not provided in the conventional manner. Since it suffices to connect to the circulation pipe 7 without extending to the outside, the pipe itself is shortened, the pipe is simplified, miniaturization can be achieved, and construction costs can be greatly reduced.

  Further, since the water treatment apparatus 10 purifies a part of pure water from a large amount of water in order to purify the water, the water that could not be made pure water was discharged to the outside. Since the condensed water after the water treatment that could not be purified is supplied to the hot water storage tank and reused without being thrown outside, water resources can be used effectively and the economic efficiency is improved.

  In this case, when the temperature of the water in the water supply pipe 15 of the water treatment device 10 is below a temperature that can be frozen by the control device 13, the circulation pump is in spite of the fact that the power generation device is stopped. 8 is operated to circulate the hot water in the hot water storage tank 6 into the water treatment device 10, so that the water treatment device 10 can be prevented from being damaged by freezing, the power generation device itself can be prevented from being damaged, After the hot water is also supplied to the water treatment apparatus 10, the drainage from the water treatment apparatus 10 can be returned to the hot water storage tank 6 by the drainage pipe 36, and water resources can be effectively utilized.

  1 and 2, the water is supplied to the water treatment device 10 by the discharge pressure of the circulation pump 8, but the discharge pressure of the circulation pump 8 is controlled by the amount of power generation, and the water to the heat exchanger 5 is controlled. The supply amount and the water supply amount to the water treatment apparatus 10 may be controlled.

  That is, in the solid electrolyte fuel cell 1, for example, surplus fuel gas is burned above the hollow flat plate fuel cell, but a large amount of fuel gas is supplied to increase the load and increase the amount of power generation. Therefore, combustion gas increases and exhaust heat also increases. Accordingly, when the power generation amount of the fuel cell 1 is varied depending on the load, for example, when the maximum output is to be obtained, the discharge pressure by the circulation pump 8 of the circulation pipe 7 is largely controlled by the control device 13, and the water treatment device 10. The amount of water supplied to the heat exchanger can be increased, the purification of pure water can be activated, the amount of reforming into fuel gas can be activated, the amount of power generated can be increased, and the amount of water supplied to the heat exchanger 5 can be increased. The heat exchange with the increased high temperature exhaust gas can be activated.

  In this case, the discharge pressure of the circulation pump 8 may be constant, the water supply amount to the heat exchanger 5 may be constant, and a water supply pump may be newly provided in the water supply pipe 7 to the water treatment device 10. Moreover, you may provide the valve which controls the water supply amount to a reverse osmosis membrane in the water treatment apparatus 10 instead of providing a water supply pump newly. In this case, the water supply amount to the water treatment apparatus 10 can be controlled by the water supply pump and the valve.

  1 and 2, the fuel humidifier 4 is provided and pure water is supplied to the fuel humidifier 4. However, the pure water is directly supplied to the reformer itself without providing the fuel humidifier. Water may be supplied, mixed with the raw fuel gas in this reformer, and steam reformed. Further, a pure water supply pipe may be connected to a pipe for supplying raw fuel gas.

  Further, in the power generation device of FIGS. 1 and 2, the example in which the reformer 38 is housed in the case for housing the fuel cell 1 has been described, but a reformer is separately provided outside the housing case for the fuel cell 1. Also good.

It is a block diagram which shows the electric power generating apparatus of this invention. It is a block diagram which shows the other electric power generating apparatus of this invention. It is a block diagram which shows the conventional electric power generating apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Fuel cell 5 ... Heat exchanger 6 ... Hot water storage tank 7 ... Circulation piping 7a ... Outward circulation piping 7b ... Return circulation piping 8 ... Circulation pump 10 ... Water Treatment device 13 ... Control device 15 ... Water supply piping 35, 36 ... Drainage piping 37, 38 ... Reformer

Claims (5)

A reformer that performs steam reforming of a hydrocarbon-based raw fuel gas, a fuel cell that generates power using the fuel gas and oxidant gas supplied from the reformer, and steam reforming in the reformer A water treatment device for purifying pure water; a heat exchanger for recovering exhaust heat from the fuel cell; and a hot water storage tank for storing hot water. A water supply pipe for supplying water, a pure water supply pipe for supplying purified pure water, and a drain pipe for discharging waste water after water treatment that has not been purified to pure water from the water treatment device. The heat exchanger and the hot water storage tank are connected by a circulation pipe, and a water supply pipe and / or a drain pipe connected to the water treatment device are connected to the circulation pipe. A power generator. The circulation pipe includes an outward circulation pipe that connects the bottom of the hot water storage tank and the heat exchanger, and a return circulation pipe that connects the heat exchanger and the upper part of the hot water storage tank, and circulates in the middle of the outward circulation pipe. The power generator according to claim 1, further comprising a pump, wherein a water supply pipe of the water treatment apparatus is connected to an outward circulation pipe between the circulation pump and the heat exchanger. The circulation pipe is composed of an outward circulation pipe that connects the bottom of the hot water storage tank and the heat exchanger, and a return circulation pipe that connects the heat exchanger and the upper part of the hot water storage tank, and is a drain pipe of the water treatment device. The power generator according to claim 1, wherein the power generator is connected to the return circulation pipe. When the temperature of the water supplied to the water treatment device becomes equal to or higher than a predetermined temperature, the hot water in the hot water storage tank is discharged, and the operation is controlled so that the temperature of the water supplied by the water supply pipe becomes equal to or lower than the predetermined temperature. The power generator according to claim 1, further comprising a device. When the temperature of the water in the water supply pipe of the water treatment apparatus becomes equal to or lower than a predetermined temperature, the circulating pump is operated and the water in the hot water storage tank is supplied to the water treatment apparatus through the water supply pipe to prevent freezing. 5. The control device according to claim 2, further comprising a control device that controls the operation of the circulating pump so as to stop when the temperature of the water in the water supply pipe of the water treatment device exceeds a predetermined temperature. A power generation device according to claim 1.

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