JP6703926B2 - Energy supply system - Google Patents

Description

The present invention, when the fuel gas non-consumption state required based on the duration for which the flow rate of the fuel gas continues to be less than or equal to the set determination amount does not occur during the leakage determination period, activates an alarm or the fuel gas , A power supply unit including a power generation unit that generates power using fuel gas that has passed through the microcomputer meter, and an operation control unit that controls the operation of the energy supply unit,
The energy supply unit is provided with a hot water supply combustor that burns using the fuel gas that has passed through the microcomputer meter,
When the hot water supply start condition is satisfied, the operation control unit performs hot water supply operation processing in which the hot water supply combustor is burnt until a hot water supply stop end condition is satisfied, and the power generation before the leakage determination period elapses. The present invention relates to an energy supply system configured to execute a leakage determination avoidance stop process of stopping the operation of a unit until a start prohibition release condition is satisfied.

Such an energy supply system is installed in, for example, a general household and supplies hot water and electric power consumed in the general household. By the way, as the energy supply unit, a unit configured as an electric power supply unit having only a power generation unit, and in addition to the power generation unit, a heat source unit having a hot water storage tank for storing hot water recovered from exhaust heat of the power generation unit are provided. Some are configured as a combined heat and power unit.
When configured as a combined heat and power supply unit, the hot water supply combustor is installed in the heat source unit.

That is, in such an energy supply system, when the operation control unit satisfies the hot water supply start condition by opening the general hot water tap or the like, the operation controller burns the hot water supply combustor until the hot water supply stop end condition is satisfied by closing the general hot water tap or the like. The hot water supply operation process of supplying hot water is performed.
In addition, the operation control unit executes the leakage determination avoiding stop process to prevent the microcomputer meter from alarming or interrupting the supply of the fuel gas.

That is, the power generation unit is configured to include a reforming processing device that reforms the fuel gas to generate hydrogen gas, and a fuel cell to which the generated hydrogen gas is supplied, and It may be configured to include a generator driven by a gas engine that operates as fuel.
In any case, if the power generation unit continues to operate beyond the leakage determination period (for example, 30 days), the flow rate of the fuel gas becomes equal to or less than the set determination amount (for example, 1.0 L/h). Since the fuel gas non-consumption state required based on the duration for continuing the state does not occur during the leakage determination period, the micom meter shuts off the alarm or cuts off the supply of fuel gas.

Incidentally, as the fuel gas non-consumption state in which it is determined whether or not to occur during the leakage determination period (for example, 30 days), in the case of the membrane gas meter, for example, the flow rate of the fuel gas is the set determination amount. (For example, 1.0 L/h) or less will be set to a state in which the duration of continuing the state is equal to or less than the set duration (for example, 60 minutes).
In the case of an ultrasonic gas meter, for example, as the fuel gas non-consumption state in which it is determined whether or not the leakage occurs during the period for leakage determination (for example, 30 days), the flow rate of the fuel gas is set and determined. The accumulated value of the continuous time when the continuous time for maintaining the state of being less than the amount (for example, 1.0 L/h) is the set determination time or more (for example, 2 minutes or more) is the set value or more (for example, 60 minutes) Will be set to the following condition.

If the micom meter is activated by an alarm, for example, the worker who receives the notification must shut off the fuel gas supply and check whether the fuel gas is actually leaking. In addition, when the microcomputer meter cuts off the supply of fuel gas, it is not only troublesome to perform the operation to restore the supply state of fuel gas to the microcomputer meter, but also the power generation stopped due to the stop of supply of fuel gas. Since the troublesome process for restarting the engine is required, the operation control unit executes the leakage determination avoidance stop process to prevent the microcomputer meter from interrupting the supply of the fuel gas. (For example, refer to Patent Document 1 and Patent Document 2).
Note that Patent Document 1 and Patent Document 2 describe a case where the energy supply unit is configured as a combined heat and power supply unit including a power generation unit and a heat source unit.

Incidentally, as an alarm operation by a microcomputer meter, generally, an alarm display section (LED) is operated to blink. The microcomputer meter is configured to shut off the supply of fuel gas when the battery of the microcomputer meter is consumed and the battery capacity is reduced when the blinking operation of the alarm display unit (LED) is continued.

In Patent Document 1, the operation control unit stops the operation of the power generation unit on a day (28 days) corresponding to two days before the leakage determination period (30 days) or on a day corresponding to one day (29 days), Then, after stopping the operation of the power generation unit, it is determined whether or not the time during which the fuel gas is not supplied to the energy supply unit has continued for a predetermined time (60 minutes) corresponding to the set duration time (60 minutes), When the predetermined time is continued, it is determined that the start prohibition cancellation condition is satisfied, and the power generation unit is restarted.

In Patent Document 2, on the day (27 days) corresponding to three days before the leakage determination period (30 days), the power generation unit is stopped for one day, and after one day, the start prohibition cancellation condition is satisfied. In this state, the operation of the power generation unit is permitted.

JP, 2005-353292, A JP, 2008-190755, A

In such an energy supply system, in winter or the like, inconveniences such as hot and cold water such as piping of the power generation unit and the heat source unit may be frozen. Therefore, freezing by burning the fuel gas through the micom meter An anti-freeze combustor is provided, and the operation control unit is configured to execute an anti-freeze operation process in which when the anti-freeze start condition is satisfied, the anti-freeze combustor is burned until the anti-freeze end condition is satisfied. ing.

For example, when the temperature of the pipes to be heated falls below the heating start temperature and the antifreeze start condition is satisfied, the antifreeze combustor is burned to heat the pipes to be heated. When the antifreeze ending condition is satisfied due to the temperature rising above the stop temperature, the antifreeze operation process is executed in a mode in which the combustion operation of the antifreeze combustor is stopped.

Therefore, in the energy supply system, the operation control unit executes the hot water supply operation process even when the leakage determination avoiding stop process is being executed when the hot water supply start condition is satisfied by opening the hot water supply plug or the like. In addition, when the antifreezing start condition is satisfied, the operation control unit executes antifreezing operation processing.

As described above, in the energy supply system, the operation of the power generation unit is stopped by executing the antifreezing operation process in addition to the hot water supply operation process even while the leakage determination avoidance stop process is being executed. Nevertheless, there was a fear that the fuel gas non-consumption state would not be brought about.

That is, for example, as the fuel gas non-consumption state in which it is determined whether or not to occur during the leakage determination period (for example, 30 days), the duration time for continuing the state in which the flow rate of the fuel gas is equal to or less than the set determination amount. When the integrated value is set to be equal to or greater than the set determination time (for example, 2 minutes or more) and is set to be equal to or greater than the set value (for example, 60 minutes or more), the setting determination is performed after the hot water supply operation process is executed. Before the time (for example, 2 minutes) elapses, the antifreezing start condition is satisfied, the antifreezing combustor is burnt, and the like, so that the fuel gas non-consumption state may not be appropriately brought. was there.

Therefore, it is desired to appropriately obtain the fuel gas non-consumption state even when the antifreezing operation process is executed during the execution of the leakage determination avoiding stop process.

In the case where the power generation unit is configured to include a reforming processing device that reforms the fuel gas to generate hydrogen gas and a fuel cell to which the generated hydrogen gas is supplied, At the time of stopping the operation of, the filling process of filling and sealing the fuel gas through the micom meter into at least the inside of the reforming device of the reforming device and the fuel cell is sequentially executed, and then the fuel is When the fuel gas replenishment start condition is satisfied in order to maintain the gas filling state in an appropriate state, a pressure holding process for replenishing the fuel gas via the microcomputer meter is often executed until the replenishment stop condition is satisfied.

In the case where the power generation unit is configured to include the reforming processing device and the fuel cell, the power generation unit replenishes the fuel gas via the micom meter for pressure holding processing to generate power. There is a possibility that the fuel gas non-consumption state may not be brought about by performing the pressure holding process in addition to the hot water supply operation process, although the operation of the part is stopped.
Generally, the replenishment start condition is a condition that the filling pressure of the fuel gas decreases to the filling start pressure, and the replenishment stop condition is a condition that the filling pressure of the fuel gas rises to the filling set pressure.

That is, for example, as the fuel gas non-consumption state in which it is determined whether or not to occur during the leakage determination period (for example, 30 days), the duration time for continuing the state in which the flow rate of the fuel gas is equal to or less than the set determination amount. When the integrated value is set to be equal to or greater than the set determination time (for example, 2 minutes or more) and is set to be equal to or greater than the set value (for example, 60 minutes or more), the setting determination is performed after the hot water supply operation process is executed. Before the time (for example, 2 minutes) elapses, the replenishment start condition is satisfied, the pressure holding process is executed, and the like, so that the fuel gas non-consumption state may not be appropriately brought.

Therefore, in the case where the power generation unit is configured to include the reforming processing device and the fuel cell, the fuel gas non-consumption state is maintained even if the pressure maintaining process is executed during the leakage determination avoiding stop process. It is desired to obtain it properly.

The present invention has been made in view of the above circumstances, and an object thereof is to appropriately perform a fuel gas non-consumption state even when a freeze prevention operation process is executed during execution of a leakage determination avoidance stop process. The point is to provide an energy supply system that can be brought.
Another object of the present invention is to provide an energy supply system that can appropriately bring a fuel gas non-consumption state even when the pressure holding process is executed during the execution of the leakage determination avoiding stop process. There is a point.

The energy supply system of the present invention activates an alarm when the fuel gas non-consumption state obtained based on the duration time during which the flow rate of the fuel gas continues to be equal to or less than the set determination amount does not occur during the leakage determination period. Or an energy supply unit that includes a power generation unit that generates power using fuel gas that has passed through the microcomputer meter, and an operation control unit that controls the operation of the energy supply unit. The
The energy supply unit is provided with a hot water supply combustor that burns using the fuel gas that has passed through the microcomputer meter,
When the hot water supply start condition is satisfied, the operation control unit performs hot water supply operation processing in which the hot water supply combustor is burnt until a hot water supply stop end condition is satisfied, and the power generation before the leakage determination period elapses. It is configured to execute a leakage determination avoidance stop process of stopping the operation of the part until the start prohibition release condition is satisfied, and its characteristic configuration is:
The energy supply unit is provided with an antifreeze combustor that burns using the fuel gas that has passed through the microcomputer meter,
When the antifreeze start condition is satisfied, the operation control unit executes antifreeze operation processing for burning the antifreeze combustor until the antifreeze end condition is satisfied, and the leakage determination avoidance stop processing. When the hot water supply operation process is executed during execution of the above, the freeze time is set by the time elapsed after the hot water supply operation process is stopped until the set elapsed time for generating the fuel gas non-consumption state elapses. When the prevention start condition is satisfied, the freeze prevention operation process is executed after the set elapsed time has elapsed.

The above-mentioned “during execution of the leakage determination avoiding stop process” may be after the time when it is decided to stop the operation of the power generation unit, or after the time when the process of actually stopping the operation of the power generation unit is started. Alternatively, it may be after the time when the operation of the power generation unit is actually stopped.

That is, when the antifreezing start condition is satisfied, the antifreezing operation process for performing the combustion operation of the antifreezing combustor until the antifreezing ending condition is satisfied is executed.
When the hot water supply operation process is executed while the leakage determination avoidance stop process is being executed, the elapsed time after the hot water supply operation process is stopped is the set elapsed time for generating the fuel gas non-consumption state. By the time, when the antifreezing start condition is satisfied, the antifreezing operation process is executed after the set elapsed time has elapsed.

In other words, during execution of the leakage determination avoidance stop processing, the freeze prevention starts until the elapsed time after the hot water supply operation processing is stopped reaches the set elapsed time for generating the fuel gas non-consumption state. Even if the conditions are met, the execution of the antifreeze operation process will be delayed, and the set elapsed time for generating the fuel gas non-consumption state can be accurately secured, so the execution of the antifreeze operation process However, the fuel gas non-consumption state can be brought about.

In other words, even if the execution of the antifreezing operation process is delayed to some extent, the energy supply unit will not be damaged due to freezing. By delaying the execution of the antifreezing operation processing until the set elapsed time for generating has elapsed, the set elapsed time for generating the fuel gas non-consumption state can be accurately secured, and as a result, the fuel The gas non-consumption state can be brought appropriately.

In short, according to the energy supply system of the present invention, the fuel gas non-consumption state can be appropriately brought about even if the freeze prevention operation process is executed during the execution of the leakage determination avoiding stop process.

Further, a further characteristic configuration of the energy supply system of the present invention is that the power generation unit generates a hydrogen gas by steam reforming the fuel gas, and a fuel cell to which the generated hydrogen gas is supplied. And a configuration including
The operation control unit,
As the leakage determination avoiding stop process, in the state where the supply of the fuel gas is stopped, steam is supplied to at least the inside of the reforming processing device of the reforming processing device and the fuel cell to discharge the internal gas. In a state where the steam supply process and the supply of steam are stopped, at least the inside of the reforming processing device of the reforming processing device and the fuel cell is filled with a fuel gas that has passed through the microcomputer meter and sealed. When the replenishment start condition of the fuel gas is satisfied and then the replenishment stop condition is satisfied, the fuel gas is fed through the microcomputer meter until the replenishment stop condition is satisfied. Configured to perform a replenishing pressure-holding process, and
When the hot water supply operation process is executed during execution of the leakage determination avoidance stop process, the elapsed time after the hot water supply operation process is stopped is the set elapsed time for generating the fuel gas non-consumption state. When the replenishment start condition is satisfied by the time of, the holding pressure process is executed after the set elapsed time has elapsed.

That is, the power generation unit is configured to generate hydrogen gas by steam reforming the fuel gas by the reforming processing device and generate power in the fuel cell using the generated hydrogen gas.
Then, as a leakage determination avoidance stop process, in a state in which the supply of the fuel gas is stopped, a steam supply process of supplying steam to the inside of the reforming processing device and discharging the gas in the device, and a supply of steam are stopped. In this state, since the filling process of filling and sealing the fuel gas through the micom meter inside the reforming treatment device is sequentially executed, outside air enters the reforming treatment device and the reforming treatment device It is possible to suppress deterioration of the reforming catalyst and the like inside.

Further, since the pressure holding process for replenishing the inside of the reforming processing device with the fuel gas via the micom meter is performed, the volume of the fuel gas decreases as the temperature of the reforming processing device decreases, and Even if the filling state changes, the filling state of the fuel gas can be maintained in an appropriate state.

In addition, when the hot water supply operation process is executed during execution of the leakage determination avoidance stop process, the elapsed time after the hot water supply operation process is stopped exceeds the set elapsed time for generating the fuel gas non-consumption state. By the time, when the replenishment start condition is satisfied, the holding pressure process is executed after the set elapsed time has elapsed.

In other words, during the execution of the leakage determination avoidance stop processing, the replenishment start condition is maintained until the elapsed time after the hot water supply operation processing is stopped reaches the set elapsed time for generating the fuel gas non-consumption state. Even if is satisfied, the holding pressure process is delayed, and the set elapsed time for generating the fuel gas non-consumption state can be accurately secured. , Can bring fuel gas non-consumption state.

In other words, in view of the fact that the reforming treatment device (or the reforming treatment device and the fuel cell) will not be damaged even if the execution of the pressure holding treatment is delayed to some extent, the progress after stopping the hot water supply operation process To secure the set elapsed time for generating the fuel gas non-consumption state by delaying execution of the pressure holding process until the set elapsed time for generating the fuel gas non-consumption state has elapsed. As a result, the fuel gas non-consumption state can be appropriately brought.

In short, according to the further characteristic configuration of the energy supply system of the present invention, it is possible to appropriately bring the fuel gas non-consumption state even if the pressure holding process is executed during the execution of the leakage determination avoiding stop process. Become.

A further characteristic configuration of the energy supply system of the present invention is that, when the operation control unit executes the freeze prevention operation process during execution of the leakage determination avoidance stop process, the freeze prevention operation process is stopped. When the replenishment start condition is satisfied before the set elapsed time for generating the fuel gas non-consumption state elapses, the pressure holding process is performed after the set elapsed time elapses. The point is that it is configured to run.

That is, when the freeze prevention operation process is executed during execution of the leakage determination avoidance stop process, the elapsed time after the freeze prevention operation process is stopped is the set elapsed time for generating the fuel gas non-consumption state. When the replenishment start condition is satisfied by the time elapsed, the pressure holding process is executed after the set elapsed time has elapsed.

In other words, during execution of the leakage determination avoidance stop processing, replenishment is started until the elapsed time after the freeze prevention operation processing is stopped until the set elapsed time for generating the fuel gas non-consumption state has elapsed. Even if the condition is satisfied, the pressure-holding process is delayed, and the set elapsed time for generating the fuel gas non-consumption state can be accurately secured. Therefore, a fuel gas non-consumption state can be brought about.

In short, even if the pressure holding process is executed in addition to the freeze prevention operation process during the execution of the leakage determination avoiding stop process, the fuel gas non-consumption state can be brought appropriately.

A further characteristic configuration of the energy supply system of the present invention is that, when the operation control unit executes the pressure holding process during execution of the leakage determination avoiding stop process, after the pressure holding process is stopped, When the antifreeze start condition is satisfied before the set elapsed time for generating the fuel gas non-consumption state elapses, the antifreeze operation process is performed after the set elapsed time elapses. The point is that it is configured to run.

That is, when the pressure holding process is executed while the leakage determination avoiding stop process is being executed, the elapsed time after stopping the pressure holding process is the set elapsed time for generating the fuel gas non-consumption state. By the time, when the antifreezing start condition is satisfied, the antifreezing operation process is executed after the set elapsed time has elapsed.

In other words, during execution of the leakage determination avoidance stop processing, the freeze prevention starts until the elapsed time after the pressure holding processing is stopped reaches the set elapsed time for generating the fuel gas non-consumption state. Even if the conditions are met, the execution of the antifreeze operation process will be delayed, and the set elapsed time for generating the fuel gas non-consumption state can be accurately secured, so the execution of the antifreeze operation process However, the fuel gas non-consumption state can be brought about.

In short, even if the freeze prevention operation process is executed in addition to the pressure holding process during the execution of the leakage determination avoidance stop process, it is possible to appropriately bring the fuel gas non-consumption state.

Further, a further characteristic configuration of the energy supply system of the present invention, the energy supply unit is provided with a heat source unit having a hot water storage tank for storing hot water recovered from exhaust heat of the power generation unit and the hot water supply combustor,
The freeze preventing combustor is provided in each of the power generation unit and the heat source unit.

That is, since the heat source unit having the hot water storage tank and the hot water supply combustor is provided, the hot and cold water from which the exhaust heat of the power generation unit is recovered can be stored in the hot water storage tank, and the hot and cold water stored can be used to supply hot water. Even if the hot water is heated by the hot water supply combustor, the combustion energy of the hot water supply combustor can be reduced, so that energy saving can be achieved.

Further, since the antifreezing combustor is provided in each of the power generation unit and the heat source unit, it is possible to prevent the power generation unit and the heat source unit from freezing by executing the antifreezing operation processing in the power generation unit and the heat source unit. You can

In short, according to the further characteristic configuration of the energy supply system of the present invention, the combustion energy of the hot water supply combustor is reduced to save energy, while the freezing of the power generation unit and the heat source unit is appropriately prevented. be able to.

Further, the energy supply system of the present invention, when the fuel gas non-consumption state obtained based on the duration time for which the flow rate of the fuel gas continues to be the set determination amount or less does not occur during the leakage determination period, A microcomputer meter that activates an alarm or interrupts the supply of fuel gas, an energy supply unit that includes a power generation unit that generates power using fuel gas that has passed through the microcomputer meter, and an operation control unit that controls the operation of the energy supply unit. Is provided,
The energy supply unit is provided with a hot water supply combustor that burns using the fuel gas that has passed through the microcomputer meter,
When the hot water supply start condition is satisfied, the operation control unit performs hot water supply operation processing in which the hot water supply combustor is burnt until a hot water supply stop end condition is satisfied, and the power generation before the leakage determination period elapses. It is configured to execute a leakage determination avoidance stop process of stopping the operation of the part until the start prohibition release condition is satisfied, and its characteristic configuration is:
The power generation unit is configured to include a reforming processing device that generates hydrogen gas by steam reforming the fuel gas, and a fuel cell to which the generated hydrogen gas is supplied,
The operation control unit,
As the leakage determination avoiding stop process, in the state where the supply of the fuel gas is stopped, steam is supplied to at least the inside of the reforming processing device of the reforming processing device and the fuel cell to discharge the internal gas. In a state where the steam supply process and the supply of steam are stopped, at least the inside of the reforming processing device of the reforming processing device and the fuel cell is filled with a fuel gas that has passed through the microcomputer meter and sealed. When the replenishment start condition of the fuel gas is satisfied and then the replenishment stop condition is satisfied, the fuel gas is fed through the microcomputer meter until the replenishment stop condition is satisfied. Configured to perform a replenishing pressure-holding process, and
When the hot water supply operation process is executed during the execution of the leakage determination avoidance stop process, the elapsed time after the hot water supply operation process is stopped is the set elapsed time for generating the fuel gas non-consumption state. When the replenishment start condition is satisfied before the time elapses, the pressure holding process is executed after the set elapsed time elapses.

The above-mentioned “during execution of the leakage determination avoiding stop process” may be after the time when it is decided to stop the operation of the power generation unit, or after the time when the process of actually stopping the operation of the power generation unit is started. Alternatively, it may be after the time when the operation of the power generation unit is actually stopped.

That is, the power generation unit is configured to generate hydrogen gas by steam reforming the fuel gas by the reforming processing device and generate power in the fuel cell using the generated hydrogen gas.
Then, as a leakage determination avoidance stop process, in a state in which the supply of the fuel gas is stopped, a steam supply process of supplying steam to the inside of the reforming processing device and discharging the gas in the device, and a supply of steam are stopped. In this state, since the filling process of filling and sealing the fuel gas through the micom meter inside the reforming treatment device is sequentially executed, outside air enters the reforming treatment device and the reforming treatment device It is possible to suppress deterioration of the reforming catalyst and the like inside.

Further, since the pressure holding process for replenishing the inside of the reforming processing device with the fuel gas via the micom meter is performed, the volume of the fuel gas decreases as the temperature of the reforming processing device decreases, and Even if the filling state changes, the filling state of the fuel gas can be maintained in an appropriate state.

Moreover, when the hot water supply operation process is executed while the leakage determination avoiding stop process is being executed, the elapsed time after the hot water supply operation process is stopped is the set elapsed time for generating the fuel gas non-consumption state. By the time, when the replenishment start condition is satisfied, the holding pressure process is executed after the set elapsed time has elapsed.

In other words, during execution of the leakage determination avoidance stop processing, the replenishment start condition is maintained until the set elapsed time for generating the fuel gas non-consumption state elapses after the hot water supply operation processing is stopped. Even if is satisfied, the holding pressure process is delayed, and the set elapsed time for generating the fuel gas non-consumption state can be accurately secured. , Can bring fuel gas non-consumption state.

In other words, in view of the fact that the reforming treatment device (or the reforming treatment device and the fuel cell) will not be damaged even if the execution of the pressure holding treatment is delayed to some extent, the progress since the hot water supply operation processing is performed To secure the set elapsed time for generating the fuel gas non-consumption state by delaying the pressure holding process until the set elapsed time for generating the fuel gas non-consumption state has elapsed. As a result, the fuel gas non-consumption state can be appropriately brought.

In short, according to the characteristic configuration of the energy supply system of the present invention, it is possible to appropriately bring about the fuel gas non-consumption state even if the pressure holding process is executed during the execution of the leakage determination avoiding stop process.

Further, a further characteristic configuration of the energy supply system of the present invention is that the fuel gas non-consumption state is a state in which the duration time continues for a set duration time,
The set elapsed time is set to a time corresponding to the set duration.

That is, in the fuel gas non-consumption state, the duration for which the flow rate of the fuel gas is equal to or less than the set determination amount (for example, 1.0 L/h) continues for the set duration (for example, 60 minutes). Corresponding to the state that when the hot water supply operation process is executed while the leakage determination avoiding stop process is being executed, the elapsed time after the hot water supply operation process is stopped reaches the set elapsed time. Even when the antifreezing start condition or the replenishment starting condition is satisfied, the set elapsed time that delays the execution of the antifreezing operation process or the pressure holding process is set to a time corresponding to the set duration time.

In this way, the set elapsed time that delays the execution of the freeze prevention operation process or the pressure holding process even if the freeze prevention start condition or the replenishment start condition is satisfied is set to the time corresponding to the set duration time. The fuel gas non-consumption state can be brought appropriately regardless of whether the prevention operation process or the pressure holding process is executed.

In short, according to the further characteristic configuration of the energy supply system of the present invention, the fuel gas non-consumption state can be brought appropriately even if the antifreezing operation process or the pressure maintaining process is executed.

Further, a further characteristic configuration of the energy supply system of the present invention is a state in which the fuel gas non-consumption state is such that an integrated value of the continuation times when the continuation time is a set determination time or more is a set value or more. ,
The set elapsed time is set to a time corresponding to the set determination time.

That is, in the fuel gas non-consumption state, the duration for continuing the state in which the flow rate of the fuel gas is the set determination amount (for example, 1.0 L/h) or less is the set determination time or more (for example, 2 minutes or more). When the hot water supply operation process is executed while the leakage determination avoidance stop process is being executed, the hot water supply will be performed in response to the state in which the integrated value of the durations is equal to or greater than the set value (for example, 60 minutes). A setting that delays the execution of the antifreeze operation process or pressure holding process even if the antifreeze start condition or the replenishment start condition is satisfied before the elapsed time after stopping the operation process reaches the set elapsed time The elapsed time is set to the time corresponding to the set judgment time.

In this way, the set elapsed time that delays the execution of the antifreeze operation process or the pressure holding process even when the antifreeze start condition or the replenishment start condition is satisfied is set to the time corresponding to the set determination time. Regardless of whether the preventive driving process or the pressure-holding process is executed, it is possible to make the integrated value of the duration time equal to or more than the set value, and as a result, the fuel gas non-consumption state can be appropriately brought.

In short, according to the further characteristic configuration of the energy supply system of the present invention, the fuel gas non-consumption state can be brought appropriately even if the antifreezing operation process or the pressure maintaining process is executed.

Schematic configuration diagram of energy supply system Block diagram showing the configuration of the reforming treatment device Block diagram showing the configuration of the heat source unit Flowchart showing leakage determination avoidance processing Flowchart showing pressure holding processing Flowchart showing freeze prevention operation processing of the power generation unit Flowchart showing the antifreezing operation process of the heat source unit

[First Embodiment]
Hereinafter, an energy supply system according to the present invention will be described with reference to the drawings.
(Overall structure of energy supply unit)
As shown in FIG. 1, the energy supply system includes, as an energy supply unit H, a combined heat and power supply unit including a power generation unit Ha and a heat source unit Hb that generate electric power by using a fuel gas G that has passed through an ultrasonic microcomputer meter M. The heat source unit Hb is provided with a hot water storage tank 1 for storing hot water obtained by recovering exhaust heat of the power generation unit Ha, and an auxiliary heat source device 2 for burning the fuel gas G via the microcomputer meter M. There is.

The auxiliary heat source device 2 will function as the hot water supply combustor K and the freeze prevention combustor N of the heat source part Hb, the details of which will be described later.
The fuel gas G that has passed through the microcomputer meter M is supplied to various gas consuming equipment such as a gas stove, but in the present embodiment, the description of the gas consuming equipment will be omitted.

The microcomputer meter M determines that the fuel gas non-consumption state obtained based on the duration time during which the state where the flow rate of the fuel gas is equal to or less than the set determination amount (for example, 1.0 L/h) is continued during the leakage determination period. When it does not occur, it has a function of interrupting the supply of fuel gas.
In the present embodiment, in the fuel gas non-consumption state, the duration for which the flow rate of the fuel gas is equal to or less than the set determination amount (for example, 1.0 L/h) is equal to or longer than the set determination time (for example, 2 minutes). In the above case, the integrated value of the duration is equal to or more than the set value (for example, 60 minutes).
By the way, the fuel gas G is a gas containing hydrocarbons such as city gas and propane gas.

The power generation unit Ha is provided with a reforming processing device 3 that produces a hydrogen-containing gas by steam reforming the fuel gas G, and a solid polymer fuel cell 4 to which the produced hydrogen-containing gas is supplied. ing.
The fuel cell 4 is configured by stacking cells including a fuel electrode 4n and an oxygen electrode 4s, and cooling water flows between the cells, that is, between the fuel electrode 4n and the oxygen electrode 4s. A flow section 4d is provided.

Cooling water circulation passage 5A for collecting heat generated by the fuel cell 4 with cooling water, hot and cold water circulation passage 5B for circulating hot and cold water of the hot water storage tank 1, cooling water and hot and cold water circulation passage 5B for circulating cooling water circulation passage 5A A heat exchanging unit 5C for exchanging heat with hot and cold water is provided.
The cooling water circulation passage 5A is provided with a cooling water circulation pump Pa and a cooling water storage tank Q, and the hot water circulation passage 5B is provided with a hot water circulation pump Pb.

Then, the hot water flowing through the hot water circulation passage 5B is heated by the cooling water circulating through the cooling water circulation passage 5A to store hot hot water in the hot water storage tank 1, and the hot and cold water stored is used for hot water supply and heating. Further, it is configured to reheat the bath water, and when the amount of heat stored in the hot water storage tank 1 is insufficient, it is configured to operate the auxiliary heat source device 2, the details of which will be described later.

An inverter 6 for system interconnection is provided on the power output side of the fuel cell 4, and this inverter 6 has the same voltage and the same frequency as the power received by the commercial power source 7 from the power generated by the fuel cell 4. Is configured to.
The commercial power source 7 is, for example, a single-phase three-wire type 100/200V, and is electrically connected to a power load 9 such as a television, a refrigerator, and a washing machine via a received power supply line 8.
The inverter 6 is electrically connected to the received power supply line 8 via the generated power supply line 10, and the generated power from the fuel cell 4 is supplied to the power load 9 via the inverter 6 and the generated power supply line 10. Is configured.

The received power supply line 8 is provided with a power load measurement unit 11 that measures the load power of the power load 9. The power load measuring unit 11 is also configured to detect whether or not a so-called reverse power flow occurs, in which a current flows on the commercial power supply 7 side in the received power supply line 8.
Then, the electric power supplied from the fuel cell 4 to the received electric power supply line 8 is controlled by the inverter 6 so that the reverse power flow does not occur, and the surplus electric power of the electric power generated by the fuel cell 4 is converted into heat. It is configured so that it is supplied to the electric heater 12 which is collected instead.

The electric heater 12 is composed of a plurality of electric heater portions, and the electric heater 12 is provided to heat the hot water flowing through the hot water circulating passage 5B described above.
A plurality of electric heater portions of the electric heater 12 are switched on/off by a switch circuit 13. The switch circuit 13 is configured to adjust the power consumption of the electric heater 12 according to the size of the surplus power so that the power consumption of the electric heater 12 increases as the size of the surplus power increases.

The power generation unit Ha is provided with a power generation control unit Ca that controls the operation of the reforming processing device 3 and the fuel cell 4, and the heat source unit Hb is provided with a heat source control unit Cb that controls the operation of the heat source unit Hb. The operation control unit C that controls the operation of the energy supply unit H includes a power generation control unit Ca and a heat source control unit Cb.
The power generation control unit Ca and the heat source control unit Cb are configured to communicate various information freely, and the power generation control unit Ca and the heat source control unit Cb are instructed to start and stop operations. A remote controller R for instructing various kinds of information is provided.

(Reformer)
Next, the reforming processing device 3 will be described. As shown in FIG. 2, a fuel supply passage 16 for pumping the fuel gas G through the microcomputer meter M by the fuel pump 15 is provided, and the fuel supply passage 16 is provided in the fuel supply passage 16. A desulfurizer 17 that desulfurizes the fuel gas G that is supplied is provided.
A steam generator 18 that vaporizes the supplied water to generate steam is provided, and a reformer that reforms desulfurized fuel gas from the desulfurizer 17 with steam from the steam generator 18 to generate a hydrogen-containing gas. A quality device 19 is provided.

Further, a shifter 20 for transforming carbon monoxide contained in the reformed gas reformed by the reformer 19 into carbon dioxide, and the entire amount of the shift gas transformed by the shifter 20 are supplied. Gas cooler 21 that cools the supplied steam to condense the steam in the modified gas, and a steam separator 22 that separates condensed water in which the steam in the modified gas is condensed by cooling by the gas cooler 21. Is provided.

Part of the shift gas from which condensed water has been separated by the steam separator 22 is supplied to the carbon monoxide selective oxidizer 23, and the carbon monoxide contained in the supplied shift gas is selectively oxidized. The hydrogen-containing gas from the carbon oxide selective oxidizer 23 is configured to be supplied to the fuel electrode 4n of the fuel cell 4 as a fuel gas for power generation through the fuel cell supply passage 24.
Further, the rest of the shift gas from which the condensed water is separated by the steam separator 22 is mixed and supplied as the hydrogen-containing gas for desulfurization treatment to the fuel gas G of the fuel supply passage 16 through the desulfurization recycle passage 25. It is configured.

Incidentally, during normal operation, the gas cooler 21 and the steam separator 22 separate the water vapor in the shift gas that has been shift-treated by the shift converter 20 as described above, and will be described later. In the gas purging process, the steam remaining inside the reforming device 3 is separated.

As described above, in the reforming treatment apparatus 3, the fuel gas G supplied through the fuel supply passage 16 is subjected to steam reforming treatment in the reformer 19 to generate the hydrogen-containing gas, which is then generated in the reformer 19. The hydrogen-containing gas is passed through the shift converter 20 and the carbon monoxide selective oxidizer 23 in this order to reduce the carbon monoxide concentration contained in the hydrogen-containing gas, and the hydrogen-containing gas having a low carbon monoxide concentration is generated. The fuel gas is supplied to the fuel cell 4 through the fuel cell supply passage 24.

(Details of reformer)
Hereinafter, each part of the reforming processing device 3 will be described.
As is clear from the above description, the fuel gas G supplied through the fuel supply passage 16 is the desulfurizer 17, the reformer 19, the shift converter 20, the gas cooler 21, the steam separator 22, the carbon monoxide selective oxidation. Since it flows through the gas processor 23, the desulfurizer 17, the reformer 19, the shift converter 20, the gas cooler 21, the water/water separator 22, and the carbon monoxide selective oxidizer 23 are arranged in the gas treatment flow path 27 in the stated order. It is connected with.

Of the hydrogen-containing gas supplied to the fuel electrode 4n of the fuel cell 4 through the fuel cell supply path 24, the remaining gas that is not used for power generation is exhausted from the fuel electrode 4n of the fuel cell 4 (hereinafter abbreviated as off gas). An off-gas passage 26 is provided to supply the reformer burner 19a of the reformer 19 with the off-gas as combustion gas.
That is, a state in which the off gas after the power generation reaction discharged from the fuel cell 4 is burned by the combustion air from the combustion air passage 29 in the reformer burner 19a to allow the reforming catalyst to undergo the reforming reaction. It is configured to heat to.

A steam passage 28 that guides steam from the steam generator 18 is connected to a gas treatment flow path 27 that connects the desulfurizer 17 and the reformer 19, and the fuel gas G desulfurized by the desulfurizer 17 and steam are generated. The steam generated in the vessel 18 is supplied to the reformer 19.

The fuel supply path 16 is provided with a fuel valve V1 which connects and disconnects the supply of the fuel gas G, the fuel cell supply path 24 is provided with a generated gas outlet valve V2, and the off gas path 26 is provided with a reformer burner. A battery outlet valve V6 for connecting and disconnecting the off gas to 19a is provided, and a combustion air valve V10 for connecting and disconnecting the supply of the combustion air to the reformer burner 19a is provided in the combustion air passage 29. ..

Although not shown, a fuel supply path for supplying the fuel gas G via the micom meter M to the reformer burner 19a at the time of startup is provided, and the fuel supply path is intermittently supplied with fuel. It is equipped with an intermittent valve.

A cell bypass passage 30 is branched from a location on the upstream side of the produced gas outlet valve V2 in the fuel cell supply passage 24, and the cell bypass passage 30 is located at a location downstream of the cell outlet valve V6 in the off gas passage 26. It is connected.
Further, the battery bypass passage 30 is provided with a battery bypass valve V7 that opens and closes the passage.

The steam generator 18 is capable of heat exchange between a combustion gas flow section 18a for flowing the combustion gas discharged from the reformer burner 19a and an evaporation section 18b for supplying water through the reforming water supply passage 31. And is configured to generate water vapor by using the combustion gas discharged from the reformer burner 19a of the reformer 19 as a heat source to vaporize water.

The reforming water supply passage 31 is provided with a reforming water valve V3 for intermittently supplying water.
Further, the steam generator 18 is provided with a reforming water discharge passage 32 for discharging internal water, and the reforming water discharge passage 32 is provided with a reforming water discharge valve V4 for opening and closing the passage. ing.

The desulfurization recycle path 25 is provided so as to connect the gas phase part of the steam separator 22 and the fuel supply path 16, and the desulfurization recycle path 25 is provided with a desulfurization recycle valve V8 for opening and closing the flow path. ing.
A selective oxidation air passage 33 for supplying the selective oxidation air to the carbon monoxide selective oxidizer 23 is provided, and the selective oxidation air passage 33 is provided with a selective oxidation air valve V9 for opening and closing the passage. ing.

The reformer 19 is provided with a reformer temperature sensor 34 so as to detect the temperature of the highest temperature in the reforming reaction region inside the reformer 19, and the fuel cell supply passage 24 has a flow passage. A reforming processing apparatus-side pressure sensor 35 that detects the internal pressure as the internal pressure of the reforming processing apparatus 3 is provided.

Incidentally, the fuel supply passage 16, the gas treatment passage 27, the steam passage 28, the reforming water supply passage 31, the reforming water discharge passage 32, the desulfurizer 17, the steam generator 18, the reformer 19, the shift converter 20, A gas treatment path formed by the carbon oxide selective oxidizer 23 and the fuel cell supply path 24, that is, the carbon monoxide selective oxidation from the desulfurizer 17 and the steam generator 18 through the reformer 19 and the shift converter 20. Since the reformer 19 has the highest temperature in the gas treatment path to the gas processor 23, the reformer temperature sensor 34 detects the temperature of the highest temperature part in the gas treatment path.

Further, the off-gas passage 26 is provided with a fuel cell side pressure sensor 36 that detects the pressure in the passage as the pressure of the gas passage for the fuel electrode 4n of the fuel cell 4. That is, as described later, when the fuel electrode 4n of the fuel cell 4 is filled with the fuel gas G, the filling pressure is detected by the fuel cell side pressure sensor 36.

The detection information of the reformer temperature sensor 34, the reforming processing device side pressure sensor 35, and the fuel cell side pressure sensor 36 is input to the power generation control unit Ca, and the power generation control unit Ca starts the reforming processing device 3. It is configured to perform operation, steady operation (normal operation), stopped storage operation, and the like.

(Stop storage operation of power generation section)
Next, the stopped storage operation when the storage of the reforming processing device 3 and the fuel cell 4 is stopped will be described.
When the power generation control unit Ca performs a stop storage operation in which the reforming processing device 3 and the fuel cell 4 are stopped and stored, the steam generator is stopped while the supply of the fuel gas G through the fuel supply passage 16 is stopped. By continuing the generation of steam by 18, the steam is supplied to the inside of the reforming apparatus 3 and the fuel cell 4, and the gas existing inside the reforming apparatus 3 and the fuel electrode 4n of the fuel cell 4 is discharged. Water vapor supply process (hereinafter, referred to as steam purge process) is performed, then the supply of water to the steam generator 18 is stopped, the water is discharged from the inside of the steam generator 18, and the reforming process is performed. The inside of the device 3 and the inside of the fuel electrode 4n of the fuel cell 4 are configured to perform a filling process (hereinafter referred to as a gas purge process) for filling and sealing the fuel gas G that has passed through the micommeter M as a purge gas. ing.

Further, after the gas purging process, the power generation control unit Ca keeps the filling pressure of the reforming treatment device 3 at the filling set pressure on the reforming treatment device side and sets the filling pressure of the fuel electrode 4n of the fuel cell 4 on the fuel cell side. In order to maintain the filling set pressure of (1), the pressure holding process for replenishing the reforming treatment device 3 and the fuel cell 4 with the fuel gas G that has passed through the microcomputer meter M is performed.
Incidentally, in the present embodiment, the replenishment of the fuel gas G to the fuel cell 4 is configured so as to supply the fuel gas G with which the inside of the reforming treatment device 3 is filled to the fuel cell 4 as described later. Has been done.

The stop storage operation will be described below.
That is, during the steady operation (during normal operation) of the reforming treatment device 3 and the fuel cell 4, the fuel valve V1, the produced gas outlet valve V2, the reforming water valve V3, the cell outlet valve V6, the desulfurization recycle valve V8, the selective oxidation. The air valve V9 for combustion and the air valve V10 for combustion are open, and the reforming water discharge valve V4 and the battery bypass valve V7 are closed.

As will be described later, when the stop condition is satisfied, for example, when 26 days, which is four days before the leakage determination period of the microcomputer meter M (for example, 30 days), has elapsed, the power generation control unit Ca causes the steam Start the purging process. That is, the fuel valve V1, the desulfurization recycle valve V8, and the selective oxidation air valve V9 are closed, and the cell bypass valve V7 is opened to start the steam purge process (steam supply process).

Thereafter, when the temperature detected by the reformer temperature sensor 34 becomes a temperature at which condensation of water vapor can be prevented and a gas purge start temperature at which carbon precipitation due to thermal decomposition of the fuel gas G can be prevented or less, the reforming water valve V3 is closed. The gas purging process is started by opening the reforming water discharge valve V4, opening the fuel valve V1 and closing the combustion air valve V10.

After that, when the set time elapses, the reforming water discharge valve V4 is closed to end the discharge of water from the steam generator 18, and then the pressure detected by the fuel cell side pressure sensor 36 is set to the fuel cell side filling setting. When the pressure becomes equal to or higher than the pressure, the generated gas outlet valve V2 and the battery outlet valve V6 are closed. The process ends. That is, the reforming processing device 3 and the fuel cell 4 are placed in a sealed state filled with the fuel gas G.

Even if the reforming treatment device 3 and the fuel cell 4 are closed by the gas purging treatment, the filling pressure of the reforming treatment device 3 and the fuel cell 4 is lowered with the subsequent temperature decrease.
Therefore, the pressure-holding process is subsequently executed on the reforming processing device 3.
That is, when the pressure detected by the reforming device side pressure sensor 35 becomes equal to or lower than the charging start pressure on the reforming device side which is lower than the charging setting pressure on the reforming device side, the fuel valve V1 is opened to set the charging setting on the reforming device side. When the pressure exceeds the pressure, the fuel valve V1 is closed. Details of this pressure holding process will be described later.

Further, the fuel cell 4 is subjected to a pressure holding process for supplying the fuel gas G with which the reforming processing device 3 is filled to the fuel cell 4. That is, when the detected pressure of the fuel cell side pressure sensor 36 becomes equal to or lower than the filling start pressure on the fuel cell side which is lower than the filling set pressure on the fuel cell side, the generated gas outlet valve V2 is opened to be equal to or higher than the filling set pressure on the fuel cell side. Then, the produced gas outlet valve V2 is closed. That is, when the filling pressure of the fuel cell 4 becomes low, the fuel gas G with which the reforming processing device 3 is filled is supplied to the fuel cell 4.

In the start-up operation for starting the reforming treatment apparatus 3 that is stopped, first, the fuel gas G is supplied to the reformer burner 19a to perform the combustion start processing for starting the combustion of the reformer burner 19a, After that, when the temperature of the reformer 19 rises to the steam supply start temperature at which the thermal decomposition of the fuel gas G can be prevented and the condensation of steam can be prevented, the steam from the steam generator 18 is supplied to the reforming treatment apparatus 3 And a steam replacement process for replacing the fuel gas G filled in the fuel cell 4 with steam, and thereafter, when the temperature of the reformer 19 rises to the reforming process start temperature, the fuel for supplying the fuel gas G is supplied. Although the supply process is started, the details thereof are well known, and thus detailed description thereof will be omitted in the present embodiment.

(Structure of heat source section)
As shown in FIG. 3, in the heat source unit Hb, in addition to the hot water storage tank 1 and the auxiliary heat source device 2 described above, a multifunction circulation pump 40, a heating circulation pump 41, a bath heating circulation pump 42, and a heating heat An exchanger 43 and a heat exchanger 44 for bath heating are provided.
The heat source unit Hb is provided with a hot water supply mixing valve 45, a heating solenoid valve 46, a bath heating solenoid valve 47, a three-way valve 48, a tank proportional valve 49, and a heat storage switching valve 50.

The hot water storage passage 1 is provided at the top of the hot water storage tank 1, the hot water supply passage 52 is provided at the bottom of the hot water storage tank 1, and the hot water delivery passage 51 is connected to the hot water supply mixing valve 45 to mix hot water. A hot water supply passage 58 extends from the valve 45.
A water supply passage 53 for supplying hot water from a water supply source such as tap water, a first water supply passage 53a connected to the hot water supply mixing valve 45, and a second water supply passage 50 connected to the hot water supply passage 52. It is branched into a water supply channel 53b.

A multifunctional circulation path 54 in which the multifunctional circulation pump 40 is arranged is provided in a state of passing through the auxiliary heat source device 2, the heating heat exchanger 43, the bath heating heat exchanger 44, and the three-way valve 48, The three-way valve 48 is connected to a branch passage 51 a branched from the hot water extraction passage 51, and the hot water supply passage 52 is connected to the multifunctional circulation passage 54.
The heating heat exchanger 43 and the bath reheating heat exchanger 44 are arranged in parallel with each other in the multifunctional circulation path 54, and the heating solenoid valve 46 allows the hot water flow through the heating heat exchanger 43. And the bath heating solenoid valve 47 is arranged in the multi-function circulation path 54 in such a manner that the hot water flowing through the bath heating heat exchanger 44 is intermittent.

A joint flow passage 55 that connects the downstream side portion of the auxiliary heat source device 2 in the multifunctional circulation passage 54 and the hot and cold water discharge passage 51 is provided, and the joint flow passage 55 is provided with a tank proportional valve 49.
The heating circulation path 56 is provided so as to pass through the heating heat exchanger 43, and the heating circulation pump 41 is provided in the heating circulation path 56.
The bath circulation path 57 is provided in a state of passing through the bath heating heat exchanger 44, and the bath heating circulation pump 42 is provided in the bath circulation path 57.

Then, the heat source unit Hb supplies the heat medium to the heating terminal through the hot water supply operation process in which the hot and cold water from the hot and cold water discharge path 51 and the hot and cold water from the first water supply path 53a are mixed and supplied from the hot water supply path 58, and the heating circulation path 56. The heating operation process for heating and the bath heating operation process for heating while circulating the bath water through the bath circulation path 57 are configured.

Each of the hot water supply operation process, the heating operation process, and the bath heating operation process is performed using the hot water of the hot water storage tank 1, but when the hot water storage amount of the hot water storage tank 1 is insufficient, the auxiliary heat source device 2 It is configured to be combusted.
For example, when performing a hot water supply operation, when the hot water storage amount of the hot water storage tank 1 is large, the hot and cold water of the hot water storage tank 1 is supplied to the hot water supply mixing valve 45 through the hot water take-out path 51. In this case, the hot water from the second water supply passage 53b is supplied to the hot water storage tank 1 through the hot water supply passage 52 while passing through the heat storage switching valve 50.

In the hot water supply operation process, when the amount of heat stored in the hot water storage tank 1 is small, the hot water from the second water supply passage 53b is supplied to the multi-function circulation passage 54 through the hot water supply passage 52 while passing through the heat storage switching valve 50. After being heated by the auxiliary heat source device 2, it is made to flow to the hot and cold water discharge passage 51 through the joint flow passage 55.

When performing the heating operation process or the bath heating operation process, when the hot water storage amount of the hot water storage tank 1 is large, the hot and cold water of the hot water storage tank 1 is multi-functionally circulated through the branch passage 51a while the multi-function circulation pump 40 is operated. After being supplied to the passage 54 to flow the heating heat exchanger 43 and the bath heating heat exchanger 44, the heating heat exchanger 43 and the bath heating heat exchanger 44 are returned to the hot water storage tank 1 through the hot water supply passage 52.

When performing the heating operation process or the bath heating operation process, when the stored hot water amount of the hot water storage tank 1 is small, the multi-way circulation pump 40 is operated in a state where the three-way valve 48 is switched to close the branch passage 51a, The hot and cold water in the multifunctional circulation path 54 is circulated, and the circulated hot and cold water is heated by the auxiliary heat source device 2.

(About hot water supply operation processing)
As described above, in the hot water supply operation process, when the hot water supply start condition is satisfied, and when the heat storage amount of the hot water storage tank 1 is small, the auxiliary heat source device 2 functioning as the hot water supply combustor K is satisfied until the hot water supply stop end condition is satisfied. Combustion will be operated.

The hot water supply start condition is, for example, that the hot water supply sensor W, which detects that hot water flows through the hot water supply passage 58 by opening a hot water supply plug (not shown) provided at the tip of the hot water supply passage 58, detects the flow of hot water. The hot water supply stop termination condition is a condition that the water flow sensor W does not detect the flow of hot water due to the hot water supply plug being closed.

That is, when the flow sensor W detects the flow of hot water, the heat source control unit Cb supplies the hot water mixing valve 45, the auxiliary heat source device 2, and the like to supply hot water having a target temperature through the hot water supply passage 58. It is configured to control actuation.

(Leakage determination avoidance process)
The power generation control unit Ca stops the operation of the power generation unit Ha until the start prohibition release condition is satisfied at the time when 26 days corresponding to 4 days before the leakage determination period of the microcomputer meter M (for example, 30 days) has elapsed. A leakage determination avoiding stop process and a warning process for displaying a message prompting to refrain from consuming fuel gas G on the remote controller R until the start prohibition cancellation condition are satisfied are executed as the leakage determination avoidance process. Has been done.

In the present embodiment, the power generation unit Ha is configured to include a reforming processing device 3 that produces hydrogen gas by steam reforming the fuel gas G, and a fuel cell 4 to which the produced hydrogen gas is supplied. Therefore, the power generation control unit Ca performs the above-described stopped storage operation process for the reforming processing device 3 and the fuel cell 4 as the leakage determination avoidance stop process.

That is, with the supply of the fuel gas G stopped, a steam purging process (steam supply process) of supplying steam to the fuel electrode 4n of the reforming processing device 3 and the fuel cell 4 to discharge the internal gas, and In the state where the supply is stopped, a gas purging process (filling process) of sequentially filling and sealing the fuel electrode 4n of the reforming processing device 3 and the fuel cell 4 with the fuel gas G that has passed through the microcomputer meter M is performed, and thereafter, A pressure holding process for replenishing the inside of the reforming processing device 3 and the fuel cell 4 with the fuel gas G via the microcomputer meter M is executed so as to maintain the filling state of the fuel gas G in an appropriate state.
As the pressure holding process for the fuel cell 4, the process of supplying the fuel gas G with which the inside of the reforming processing device 3 is filled is executed as described above.

Further, the start prohibition canceling condition is that the duration for continuing the state in which the flow rate of the fuel gas G is equal to or less than the set determination amount (eg, 1.0 L/h) is equal to or longer than the set determination time (eg, 2 minutes or more). In this case, the integrated value of the continuous time is set to be equal to or more than a set value (for example, 60 minutes).
In the present embodiment, as shown in FIG. 1, a power generation side flow meter 59a and a heat source side flow meter 59b that measure the flow rate of the fuel gas G are provided in each of the power generation unit Ha and the heat source unit Hb.
Then, the power generation control unit Ca sets the flow rate of the fuel gas G to each of the power generation unit Ha and the heat source unit Hb based on the detection information of the power generation side flow meter 59a and the heat source side flow meter 59b, and sets the determination amount (for example, It is configured to determine a state of 1.0 L/h) or less.

Incidentally, in the present embodiment, as described above, the power generation side flow meter 59a and the heat source side flow meter 59b are provided. For example, regarding the power generation unit Ha, whether or not the fuel valve V1 is operated in the open state, Also, it is possible to determine whether the flow rate of the fuel gas G is equal to or less than a set determination amount (for example, 1.0 L/h) depending on whether or not the anti-freezing heating burner 60, which will be described later, has burned, and the heat source Hb. With respect to the above, since it is possible to determine whether the flow rate of the fuel gas G is equal to or less than a set determination amount (for example, 1.0 L/h), it is possible to determine whether or not the auxiliary heat source device 2 is activated. You may make it judge the time when the fuel gas G is not supplied with respect to each of the electric power generation part Ha and the heat source part Hb in the form which does not install 59a and the heat source side flowmeter 59b.

In the warning process, the flow rate of the fuel gas G supplied to the energy supply unit H is the set determination amount even when the set process scheduled time (for example, 12 hours) elapses during execution of the leakage determination avoiding process. (For example, 1.0 L/h) When the duration of continuing the state of being equal to or less than the setting determination time is equal to or longer than the setting determination time (eg, 2 minutes or more), the integrated value of the duration is equal to or more than the setting value (eg, 60 minutes). If not, a warning is given to stop the consumption of the fuel gas G.

(Details of leakage judgment avoidance processing)
Next, the leakage determination avoidance process executed by the power generation control unit Ca will be described based on the flowchart of FIG.
First, it is determined whether 26 days, which is four days before the leakage determination period of the microcomputer meter M (for example, 30 days), has passed (#1), and if 26 days or more have passed, , It is determined whether or not the power generation unit Ha has been stopped (#2). When it is determined in #1 that 26 days or more have not elapsed, the process proceeds to another process.

When it is determined in #2 that the power generation unit Ha has not been stopped, the start prohibition that prohibits the start of the power generation unit Ha is set (#3), and then the operation of stopping the reforming processing device 3 and the fuel cell 4 is stopped. Processing (steam purging processing, gas purging processing) is executed (#4).
After the operation stop process, a pressure holding process for keeping the internal pressure of the reforming processing device 3 at an appropriate pressure or a pressure holding process for keeping the internal pressure of the fuel electrode 4n of the fuel cell 4 at an appropriate pressure is used to avoid leakage determination. It is executed as a process different from the process.

Next, the duration for which the flow rate of the fuel gas G supplied to the energy supply unit H remains below the set determination amount (for example, 1.0 L/h) is the set determination time or longer (for example, 2 minutes). It is determined whether or not the integrated value of the continuous time in the above case is not less than the set value (for example, 60 minutes or more) (#5), and the integrated value is not less than the set value (for example, 60 minutes or more). If it is determined, that is, if the activation prohibition cancellation condition is satisfied, the activation prohibition is canceled to permit the activation of the power generation unit Ha (#6).

When it is determined in #5 that the integrated value is not equal to or greater than the set value (for example, 60 minutes or more), it is determined whether the scheduled processing time (for example, 12 hours) has elapsed (#7), When the scheduled processing time has elapsed, warning processing is executed to display a message on the remote controller R prompting to refrain from consuming the fuel gas G (#8).

(Regarding the pressure-holding process of the reforming device)
When the replenishment start condition of the fuel gas G is satisfied and the replenishment stop condition is satisfied, the pressure holding process of the reforming processing device 3 is performed via the microcomputer meter M in order to maintain the filling state of the fuel gas G in an appropriate state. This is a process of supplementing the fuel gas G.
In the present embodiment, the filling start pressure (for example, 0.5 kpa) in which the replenishment start condition is set so that the pressure detected by the reforming device side pressure sensor 35 is lower than the filling set pressure (for example, 1.0 kpa). The following conditions are the replenishment stop conditions and the detection pressure is the charging set pressure or more.

Further, when the operation control unit C executes the hot water supply operation process while the leakage determination avoiding stop process is being executed, the elapsed time after the hot water supply operation process is stopped is for generating the fuel gas non-consumption state. When the replenishment start condition is satisfied before the set elapsed time elapses, the pressure holding process is executed after the set elapsed time elapses.

In the present embodiment, the start prohibition cancellation condition is such that the duration for which the flow rate of the fuel gas G remains below the set determination amount (for example, 1.0 L/h) is the set determination time or longer (for example, 2 minutes). In the present embodiment, the set determination time (for example, 2 minutes) is set as the set elapsed time because it is a condition that the integrated value of the continuous time in the above case is equal to or more than the set value (for example, 60 minutes). Has been done.

In addition, when the operation control unit C executes the antifreezing operation processing described below during the execution of the leakage determination avoiding stop processing, the elapsed time from the stop of the antifreezing operation processing is the fuel gas non-consumption. When the replenishment start condition is satisfied before the set elapsed time for generating the state elapses, the pressure holding process is executed after the set elapsed time elapses.
In the present embodiment, as antifreeze operation processing, as will be described later, there are antifreeze operation processing for the power generation section Ha and antifreeze operation processing for the heat source section Hb.

In addition, "during execution of the stop process for leakage determination avoidance" may be after the time when the power generation control unit Ca determines to stop the operation of the power generation unit Ha, or when the power generation control unit Ca is actually It may be after the time when the process of stopping the operation of the power generation unit Ha is started, or after the time when the operation of the power generation unit Ha is actually stopped.

(Details of the pressure-holding process of the reforming device)
Next, the pressure holding process of the reforming processing device 3 executed by the power generation control unit Ca will be described based on the flowchart shown in FIG.
First, it is determined whether or not the reforming treatment device 3 is sealed (#11). If it is determined that the reforming treatment device 3 is sealed, then the fuel valve V1 is opened and the reforming treatment device 3 is supplied with the fuel gas G. It is determined whether or not filling is being performed (#12). If it is determined in #11 that the airtightness is not closed, the process proceeds to another process.

When it is determined in #12 that the fuel gas G is not being filled, the pressure detected by the reforming device side pressure sensor 35 is higher than the filling start pressure (for example, 0.5 kpa) at which the filling of the fuel gas G is started. Is also low (#13), and if the detected pressure is lower than the filling start pressure, then whether or not the fuel gas G is being consumed via the microcomputer meter M, That is, is the fuel gas G passing through the microcomputer meter M being consumed by the hot water supply operation process, the heating operation process, the bath heating operation process, and the antifreezing operation process of the power generation unit Ha and the heat source unit Hb described later? It is determined whether or not (#14).
When it is determined in #13 that the detected pressure is equal to or higher than the filling start pressure, the process shifts to another process.

When it is determined in #14 that the fuel gas G is being consumed, the fuel valve V1 is opened and the supply of the fuel gas G is started (#15).
When it is determined in #14 that the fuel gas G is not being consumed, the flow rate of the fuel gas G supplied to the energy supply unit H becomes equal to or less than the set determination amount (for example, 1.0 L/h). It is determined whether or not the duration for continuing the state is equal to or longer than the setting determination time (for example, 2 minutes or more) (#16). If the duration is equal to or longer than the setting determination time, the process proceeds to #15. Then, the fuel valve V1 is opened and the supply of the fuel gas G is started.

If it is determined in #16 that the duration is less than the set determination time, the process proceeds to another process. That is, the opening of the fuel valve V1 to start the supply of the fuel gas G is delayed until the duration becomes equal to or longer than the set determination time, and when the duration becomes equal to or longer than the set determination time, the process of #15 is performed. After the transition, the fuel valve V1 is opened and the supply of the fuel gas G is started.

After the supply of the fuel gas G is started, it is determined whether or not the pressure detected by the pressure sensor 35 on the reforming apparatus side is equal to or higher than the filling set pressure (for example, 1.0 kpa) (#17). If the pressure is equal to or higher than the filling set pressure, the fuel valve V1 is closed (#18), and then the process proceeds to another process.
If it is determined in #17 that the detected pressure is not equal to or higher than the filling set pressure, the process proceeds to another process.

If it is determined in #12 that the fuel gas G is being filled, the process proceeds to #17, and the pressure detected by the reforming processing apparatus side pressure sensor 35 is equal to or higher than the filling set pressure. It will be determined whether or not.

That is, as described above, in the pressure holding process of the reforming processing device 3, when the pressure detected by the reforming processing device side pressure sensor 35 becomes equal to or lower than the filling start pressure (for example, 0.5 kpa) lower than the filling setting pressure, This is a process of repeating the process of opening the valve V1 and closing the fuel valve V1 when the detected pressure becomes equal to or higher than the filling set pressure (for example, 1.0 kpa).

Although omitted in the above description, when it is determined in #16 that the duration is less than the set determination time, the pressure detected by the reforming processing device-side pressure sensor 35 is the filling start pressure (for example, 0.5 Kpa). If the lower limit pressure is lower than the lower limit pressure (for example, 0.2 Kpa) or less, even if the duration is less than the set determination time, the process proceeds to #15, the fuel valve V1 is opened, and the fuel gas G is supplied. You may make it start.

(Supplementary explanation of fuel cell pressure holding process)
The pressure holding process for the fuel cell 4 is performed based on the pressure detected by the fuel cell side pressure sensor 36 as described above.
Then, in the pressure maintaining process for the fuel cell 4, the duration time for continuing the state in which the flow rate of the fuel gas G supplied to the energy supply unit H is equal to or less than the set determination amount (eg, 1.0 L/h) is set When the pressure detected by the fuel cell side pressure sensor 36 becomes equal to or lower than the fuel cell side filling start pressure lower than the fuel cell side filling set pressure without making a determination as to whether or not it is the determination time or longer, the generated gas is immediately generated. When the outlet valve V2 is opened and the filling pressure on the fuel cell side is reached or higher, the produced gas outlet valve V2 is closed.

That is, since the pressure holding process for the fuel cell 4 is performed using the fuel gas G filled in the reforming processing device 3, unlike the pressure holding process for the reforming processing device 3, the pressure on the fuel cell side is different. As soon as the pressure detected by the sensor 36 becomes equal to or lower than the filling start pressure on the fuel cell side, the generated gas outlet valve V2 is opened.

(About freezing prevention of power generation section)
Next, the freeze prevention operation process of the power generation unit Ha will be described.
In the present embodiment, as shown in FIG. 1, the above-described antifreezing heating burner 60 is provided so as to heat the hot and cold water circulation passage 5B to be heated with the combustion exhaust gas, and the power generation control unit Ca The antifreeze operation process for heating the hot and cold water circulation passage 5B is executed based on the temperature detected by the cooling water temperature sensor 61 that detects the temperature of the cooling water in the cooling water storage tank Q.

That is, the power generation control unit Ca functions as the antifreezing combustor N in the state where the cooling water circulation pump Pa and the hot water circulation pump Pb are operated as the antifreezing operation processing of the power generation unit Ha, and the antifreezing heating burner 60 functions. Is burned to execute a process of raising the temperature of the hot water in the hot water circulation passage 5B.
By the way, the cooling water in the cooling water circulation path 5A is heated by the hot water in the hot water circulation path 5B in the heat exchange section 5C, and as a result, the temperature of the fuel cell 4 and the like is also raised.

The antifreezing operation processing of the power generation unit Ha is started when the antifreezing start condition is satisfied, and is ended when the antifreezing end condition is satisfied.
The freeze prevention start condition in the freeze prevention operation process of the power generation unit Ha is a condition in which the temperature detected by the cooling water temperature sensor 61 is lower than the heating start temperature (for example, 4° C.), and the freeze prevention end condition is the cooling water temperature. The conditions are set such that the temperature detected by the sensor 61 is higher than the heating stop temperature (for example, 10° C.).

When the hot water supply operation process is executed while the leakage determination avoidance stop process is being executed, the operation control unit C sets the time elapsed after the hot water supply operation process is stopped to generate the fuel gas non-consumption state. When the antifreezing start condition is satisfied before the elapsed time elapses, the antifreezing operation process is executed after the set elapsed time elapses.

In the present embodiment, the start prohibition cancellation condition is such that the duration for which the flow rate of the fuel gas G remains below the set determination amount (for example, 1.0 L/h) is the set determination time or longer (for example, 2 minutes). In the present embodiment, the set determination time (for example, 2 minutes) is set as the set elapsed time because it is a condition that the integrated value of the continuous time in the above case is equal to or more than the set value (for example, 60 minutes). Has been done.

In addition, when the operation control unit executes the pressure holding process of the reforming processing device 3 during the execution of the leakage determination avoidance stop process, the elapsed time after the pressure holding process is stopped is the fuel gas non-consumption. If the antifreeze start condition is satisfied before the set elapsed time for generating the state elapses, the antifreeze operation process is executed after the set elapsed time elapses.

In addition, "during execution of the stop process for leakage determination avoidance" may be after the time when the power generation control unit Ca determines to stop the operation of the power generation unit Ha, or when the power generation control unit Ca is actually It may be after the time when the process of stopping the operation of the power generation unit Ha is started, or after the time when the operation of the power generation unit Ha is actually stopped.

(Details of freeze prevention operation processing of the power generation section)
Next, the freeze prevention operation process of the power generation unit Ha executed by the power generation control unit Ca will be described based on the flowchart of FIG. 6.
First, it is determined whether or not the antifreezing operation in which the cooling water circulation pump Pa and the hot and cold water circulation pump Pb are operated and the antifreezing heating burner 60 is burned (#21) is determined. In this case, it is determined whether the temperature detected by the cooling water temperature sensor 61 is lower than the heating start temperature (for example, 2° C.) (#22).

If it is determined in #22 that the temperature detected by the cooling water temperature sensor 61 is lower than the heating start temperature (for example, 4° C.), then the fuel gas G is being consumed via the microcomputer meter M. Whether or not, that is, the fuel gas G that has passed through the micommeter M is subjected to hot water supply operation processing, heating operation processing, bath heating processing, pressure holding processing of the reforming processing device 3, and freeze prevention of the heat source unit Hb described later. By executing the driving process, it is determined whether or not consumption is being performed (#23).
If it is determined in #22 that the temperature detected by the cooling water temperature sensor 61 is higher than the heating start temperature (for example, 4° C.), the process proceeds to another process.

When it is determined in #23 that the fuel gas G is being consumed, the cooling water circulation pump Pa and the hot water circulation pump Pb are activated, and the freeze prevention heating burner 60 is combusted to start the freeze prevention operation. Yes (#24).
When it is determined in #23 that the fuel gas G is not being consumed, the flow rate of the fuel gas G supplied to the energy supply unit H is equal to or less than the set determination amount (for example, 1.0 L/h). It is determined whether or not the duration for continuing the state is equal to or longer than the setting determination time (for example, 2 minutes or more) (#25). If the duration is equal to or longer than the setting determination time, the process of #24 is performed. After that, the antifreeze operation is started.

If it is determined in #25 that the duration is less than the set determination time, the process proceeds to another process. In other words, the start of the antifreezing operation is delayed until the duration becomes equal to or longer than the set determination time, and when the duration becomes equal to or greater than the set determination time, the process proceeds to #24 to perform the antifreezing operation. Be started.

After the freezing prevention operation is started, it is determined whether the temperature detected by the cooling water temperature sensor 61 is higher than the heating stop temperature (for example, 10° C.) (#26), and the temperature detected by the cooling water temperature sensor 61 is When it is higher than the heating stop temperature (for example, 10° C.), the freeze prevention operation is ended (#27).

When it is determined in #21 that the antifreezing operation is being performed, the process proceeds to #26, in which the temperature detected by the cooling water temperature sensor 61 is higher than the heating stop temperature (for example, 10° C.). If the temperature detected by the cooling water temperature sensor 61 is higher than the heating stop temperature (for example, 10° C.), the freeze prevention operation is ended (#27).

Although omitted in the above description, in #25, when it is determined that the duration is less than the set determination time, the lower limit of the temperature detected by the cooling water temperature sensor 61 is lower than the heating start temperature (for example, 4° C.) When the temperature is equal to or lower than the temperature (for example, 1° C.), the process may be shifted to #24 and the antifreezing operation may be started even if the duration is less than the set determination time.

(About freeze prevention of heat source)
Next, the freeze prevention operation process of the heat source unit Hb will be described.
In the present embodiment, the auxiliary heat source device 2 is combusted as the anti-freezing combustor N, and as shown in FIG. 3, the anti-freezing electric heater D for heating the pipes circulates the hot and cold water. It is provided so as to correspond to each of the passage 5B, the hot water supply passage 58, and the first water supply passage 53a.

As shown in FIG. 3, each part of the multi-function circuit 54, that is, the downstream side part of the auxiliary heat source device 2, the downstream side part of the heating heat exchanger 43 or the bath heating heat exchanger 44, and the three-way valve 48. A first temperature detection sensor S1 that detects the temperature of the multifunctional circulation path 54 is provided at each of the upstream side location and the upstream side location of the auxiliary heat source device 2, and the detection information of the plurality of first temperature detection sensors S1 is provided. Based on this, the antifreezing operation process for burning the auxiliary heat source device 2 to heat the multifunctional circulation path 54 as the heating target is executed, and the details thereof will be described later.

As shown in FIG. 3, the second temperature detection sensor S2 that detects the operation control information of the antifreezing electric heater D has a hot water supply passage 58, which is located upstream of the hot water supply mixing valve 45 in the hot water supply passage 53 and the hot water extraction passage 51. The hot water supply passage 52 and the hot water circulation passage 5B are provided respectively.

Then, as an electric heater operation process for heating the antifreezing electric heater D, a detection temperature of any one of the plurality of second temperature detection sensors S2 is started to start the operation of the antifreezing electric heater D. When the temperature becomes lower than the temperature, the antifreezing electric heater D is operated, and all the detected temperatures of the plurality of second temperature detection sensors S2 become higher than the stop temperature for stopping the operation of the antifreezing electric heater D. The processing for stopping the electric heater D for freeze prevention is executed.

(Heat source freeze prevention operation processing)
Hereinafter, the antifreezing operation process for operating the auxiliary heat source unit 2 for combustion will be described.
That is, the heat source control unit Cb, as the antifreezing operation process of the heat source unit Hb, activates the auxiliary heat source unit 2 that also functions as the antifreezing combustor N in a state in which the multifunction circulation pump 40 is operated, It is configured to execute a process of raising the temperature of the hot and cold water in the multi-function circuit 54.

The antifreezing operation processing is started when the antifreezing start condition is satisfied, and is ended when the antifreezing end condition is satisfied.
The antifreezing start condition is a condition in which the detected temperature of one of the plurality of first temperature detection sensors S1 is lower than the heating start temperature (for example, 4° C.), and the antifreezing end condition is the plurality of first antifreeze conditions. The condition is that all the temperatures detected by the temperature detection sensor S1 are higher than the heating stop temperature (for example, 8° C.).

When the hot water supply operation process is executed while the leakage determination avoidance stop process is being executed, the operation control unit C sets the time elapsed after the hot water supply operation process is stopped to generate the fuel gas non-consumption state. When the antifreezing start condition is satisfied before the elapsed time elapses, the antifreezing operation process is executed after the set elapsed time elapses.

In the present embodiment, the start prohibition cancellation condition is such that the duration for which the flow rate of the fuel gas G remains below the set determination amount (for example, 1.0 L/h) is the set determination time or longer (for example, 2 minutes). In the present embodiment, the set determination time (for example, 2 minutes) is set as the set elapsed time because it is a condition that the integrated value of the continuous time in the above case is equal to or more than the set value (for example, 60 minutes). Has been done.

In addition, when the operation control unit C executes the pressure maintaining process of the reforming processing device 3 during the execution of the leakage determination avoiding stop process, the elapsed time after the pressure maintaining process is stopped is the fuel gas non-consumption. If the antifreezing start condition is satisfied before the set elapsed time for generating the consumption state elapses, the antifreeze operation process is executed after the set elapsed time elapses.

It should be noted that “during execution of the leakage determination avoiding stop process” may be after the time when the power generation control unit Ca determines to stop the operation of the power generation unit Ha as described above, or may be the power generation control unit Ca. However, it may be after the time when the process of actually stopping the operation of the power generation unit Ha is started, or further after the time when the operation of the power generation unit Ha is actually stopped.

(Details of freeze prevention operation processing for heat source)
Next, the freeze prevention operation process of the heat source unit Hb executed by the heat source control unit Cb will be described based on the flowchart of FIG. 7.
First, it is determined whether or not the antifreezing operation in which the multi-function circulation pump 40 is operated and the auxiliary heat source device 2 is in the combustion operation is in progress (#31). It is determined whether or not the detected temperature of any of the first temperature detection sensors S1 is lower than the heating start temperature (for example, 4° C.) (#32).

If it is determined in #32 that the detected temperature of any of the plurality of first temperature detection sensors S1 is lower than the heating start temperature (for example, 4° C.), then the fuel gas that has passed through the microcomputer meter M is continuously detected. Whether or not G is being consumed, that is, the fuel gas G that has passed through the micommeter M is supplied to the hot water supply operation process, the heating operation process, the bath heating process, the pressure maintaining process of the reforming processing device 3, and the power generation unit. By executing the Ha antifreezing operation process, it is determined whether or not consumption is in progress (#33).
When it is determined in #32 that all the detected temperatures of the plurality of first temperature detection sensors S1 are higher than the heating start temperature (for example, 4° C.), the process proceeds to another process.

When it is determined in #33 that the fuel gas G is being consumed, the multi-function circulation pump 40 is operated and the auxiliary heat source unit 2 is burned to start the antifreezing operation (# 34).
When it is determined in #33 that the fuel gas G is not being consumed, the flow rate of the fuel gas G supplied to the energy supply unit H becomes equal to or less than a set determination amount (for example, 1.0 L/h). It is determined whether or not the duration for continuing the state is the set determination time or longer (for example, 2 minutes or longer) (#35). If the duration is the set determination time or longer, the process proceeds to #34. Then, the antifreezing operation is started.

If it is determined in #35 that the duration is less than the set determination time, the process proceeds to another process. In other words, the start of the antifreezing operation is delayed until the duration becomes equal to or longer than the set determination time, and when the duration becomes equal to or greater than the set determination time, the process proceeds to #34, and the antifreezing operation is performed. Be started.

After the freezing prevention operation is started, it is determined whether all the detected temperatures of the plurality of first temperature detection sensors S1 are higher than the heating stop temperature (for example, 8° C.) (#36), and the plurality of first temperature detection sensors S1 are detected. When all the detected temperatures of the temperature detection sensor S1 are higher than the heating stop temperature (for example, 8° C.), the freeze prevention operation is ended (#37).

When it is determined in #31 that the antifreezing operation is being performed, the process proceeds to #36, in which all the detected temperatures of the plurality of first temperature detection sensors S1 are the heating stop temperatures (for example, , 8° C.), and if all the detected temperatures of the plurality of first temperature detection sensors S1 are higher than the heating stop temperature (for example, 8° C.), the freeze prevention operation is terminated. (#37).

Although omitted in the above description, when it is determined in #35 that the duration is less than the set determination time, the detected temperature of any of the plurality of first temperature detection sensors S1 is the heating start temperature (for example, 4). When the temperature is equal to or lower than the lower limit temperature (for example, 1° C.) lower than (° C.), the process may be shifted to #34 and the freeze prevention operation may be started even if the duration is less than the set determination time. ..

[Another embodiment]
Next, other different embodiments will be listed.
(1) In the above-described embodiment, the operation control unit C that controls the operation of the energy supply unit H controls the operation of the power generation unit Ha and the heat generation control unit Ca that controls the operation of the heat generation unit Ha. Although the case of being composed of Cb has been illustrated, the power generation control unit Ca and the heat source control unit Cb are integrated as one control unit, and the operation control unit C is configured as one control unit. Good.

(2) In the above embodiment, the case where the power generation unit Ha and the heat source unit Hb are configured as separate units has been illustrated, but the power generation unit Ha and the heat source unit Hb are configured as one unit. May be.

(3) In the above-described embodiment, the case where the power generation unit Ha includes the reforming processing device 3 and the fuel cell 4 is illustrated, but the power generation unit Ha includes an engine that operates on the fuel gas G and the engine. The present invention can also be applied to the case where the power generator is driven by a motor.

(4) In the above embodiment, the heat source part Hb having the hot water storage tank 1 is provided as an example, but the heat source part Hb provided with the hot water storage tank 1 may be omitted.

(5) In the above-described embodiment, the case where only the heat source portion Hb is provided with the antifreezing electric heater D is illustrated, but the power generation portion Ha is also provided with the antifreezing electric heater D. Good.

(6) The specific configuration of the antifreezing operation process in the power generation unit Ha and the specific configuration of the antifreezing operation process in the heat source unit Hb can be variously changed.

(7) In the above-described embodiment, the power generation unit Ha and the heat source unit Hb each perform the antifreezing operation process in which the antifreeze combustor N is burned. However, the power generation unit Ha and the heat source unit are illustrated. For one of Hb, the antifreeze operation process for burning the antifreeze combustor N is executed, and the other one is operated by the antifreeze electric heater D to perform antifreeze. The specific configuration for preventing freezing of Ha and the heat source portion Hb can be variously changed.

(8) In the above-described embodiment, the case where the pressure holding process of the reforming processing device 3 is performed based on the detection information of the reforming processing device side pressure sensor 35 has been exemplified. The specific configuration of the pressure-holding process can be changed in various ways, such as performing the fuel gas G in a set amount each time the detected temperature T drops by the set temperature Ts (eg, 50° C.).

(9) In the above embodiment, the pressure holding process for the fuel cell 4 is performed in a mode in which the fuel gas G with which the reforming processing device 3 is filled is supplied, but the fuel gas G from the microcomputer meter M is supplied. You may implement by a form.
In this case, the pressure holding process for the fuel cell 4 is determined to be during the consumption of the fuel gas G, similarly to the pressure holding process of the reforming processing device 3.

(10) In the above embodiment, the case where the heat source unit Hb performs the heating operation process or the bath heating operation process has been illustrated, but the heat source unit Hb does not perform the heating operation process or the bath heating operation process. May be.

(11) In the above embodiment, the case where the pressure holding process is performed on the fuel cell 4 has been illustrated, but the pressure holding process on the fuel cell 4 may be omitted.

(12) In the above embodiment, the ultrasonic type micom meter M is exemplified, but the present invention is also applicable to the film type micom meter M. In this case, since the fuel gas non-consumption state is set to the state in which the duration time continues for the set duration time (for example, 60 minutes), the set elapsed time is set to the time corresponding to the set duration time. It will be decided.

When the micom meter M is configured as a membrane type, the setting determination time of #16 of the pressure holding process shown in FIG. 5 is replaced with a setting duration time (for example, 60 minutes), and also shown in FIGS. 6 and 7. The setting determination times of #25 and #35 of the freeze prevention operation process are replaced with the set duration (for example, 60 minutes).
By the way, in the case where the micom meter M is configured to be a membrane type, in the pressure holding process shown in FIG. 5, the replenishment of the fuel gas G may be delayed for a set continuation time (for example, 60 minutes). When it is determined in 16 that the duration is less than the set duration, the lower limit pressure (for example, 0) at which the pressure detected by the reforming device side pressure sensor 35 is lower than the filling start pressure (for example, 0.5 Kpa). .2 Kpa) or less, even if the duration is less than the set duration, the process may proceed to #15 to open the fuel valve V1 and start the supply of the fuel gas G.

Similarly, in the antifreezing operation processing shown in FIGS. 6 and 7, the start of the antifreezing operation may be delayed for a set duration (for example, 60 minutes), so in FIG. When it is determined in #25 that the duration is less than the set duration, the temperature detected by the cooling water temperature sensor 61 is lower than the lower limit temperature (for example, 1°C) lower than the heating start temperature (for example, 4°C). If it is, it is preferable to shift to the processing of #24 and start the antifreezing operation even if the duration is less than the set duration.

In FIG. 7, when it is determined in #35 that the duration is less than the set duration, the detected temperature of any of the plurality of first temperature detection sensors S1 is the heating start temperature (for example, 4° C.). When the temperature is lower than the lower limit temperature (for example, 1° C.) lower than ), the freeze prevention operation may be started even if the duration is less than the set duration.

Note that the configurations disclosed in the above-described embodiments (including other embodiments, the same applies below) can be applied in combination with the configurations disclosed in other embodiments, as long as no contradiction occurs. The embodiment disclosed in the present specification is an example, and the embodiment of the present invention is not limited to this, and can be appropriately modified within a range not departing from the object of the present invention.

1 Hot Water Storage Tank 3 Reforming Treatment Device 4 Fuel Cell C Operation Control Section H Energy Supply Section Ha Power Generation Section Hb Heat Source Section K Hot Water Combustor M Microcomputer Meter N Freezing Prevention Combustor

Claims (8)

When the fuel gas non-consumption state, which is required based on the duration for which the flow rate of the fuel gas remains below the set judgment amount, does not occur during the leakage judgment period, an alarm is activated or the fuel gas supply is cut off. A microcomputer meter, an energy supply unit including a power generation unit that generates power using fuel gas that has passed through the microcomputer meter, and an operation control unit that controls the operation of the energy supply unit are provided,
The energy supply unit is provided with a hot water supply combustor that burns using the fuel gas that has passed through the microcomputer meter,
When the hot water supply start condition is satisfied, the operation control unit performs hot water supply operation processing in which the hot water supply combustor is burnt until a hot water supply stop end condition is satisfied, and the power generation before the leakage determination period elapses. An energy supply system configured to execute a leakage determination avoidance stop process of stopping the operation of a part until a start prohibition release condition is satisfied,
The energy supply unit is provided with an antifreeze combustor that burns using the fuel gas that has passed through the microcomputer meter,
When the antifreeze start condition is satisfied, the operation control unit executes antifreeze operation processing for burning the antifreeze combustor until the antifreeze end condition is satisfied, and the leakage determination avoidance stop processing. When the hot water supply operation process is executed during execution of the above, the freeze time is set by the time elapsed after the hot water supply operation process is stopped until the set elapsed time for generating the fuel gas non-consumption state elapses. An energy supply system configured to execute the antifreezing operation processing after the set elapsed time has elapsed when a prevention start condition is satisfied. The power generation unit is configured to include a reforming processing device that generates hydrogen gas by steam reforming the fuel gas, and a fuel cell to which the generated hydrogen gas is supplied,
The operation control unit,
As the leakage determination avoiding stop process, in the state where the supply of the fuel gas is stopped, steam is supplied to at least the inside of the reforming processing device of the reforming processing device and the fuel cell to discharge the internal gas. In a state where the steam supply process and the supply of steam are stopped, at least the inside of the reforming processing device of the reforming processing device and the fuel cell is filled with a fuel gas that has passed through the microcomputer meter and sealed. When the replenishment start condition of the fuel gas is satisfied and then the replenishment stop condition is satisfied, the fuel gas is fed through the microcomputer meter until the replenishment stop condition is satisfied. Configured to perform a replenishing pressure-holding process, and
When the hot water supply operation process is executed during execution of the leakage determination avoidance stop process, the elapsed time after the hot water supply operation process is stopped is the set elapsed time for generating the fuel gas non-consumption state. The energy supply system according to claim 1, wherein when the replenishment start condition is satisfied by the time, the pressure holding process is executed after the set elapsed time has elapsed. When the operation control unit executes the antifreezing operation processing during execution of the leakage determination avoiding stop processing, the elapsed time after stopping the antifreezing operation processing generates the fuel gas non-consumption state. 3. The pressure-holding process is executed after the set elapsed time has elapsed, when the replenishment start condition is satisfied before the set elapsed time for performing the setting elapses. Energy supply system. When the operation control unit executes the pressure holding process during execution of the leakage determination avoidance stop process, the elapsed time after stopping the pressure holding process generates the fuel gas non-consumption state. 2. The anti-freezing operation process is executed after the set elapsed time has elapsed, when the anti-freezing start condition is satisfied before the set elapsed time of. The energy supply system described. The energy supply unit is provided with a heat source unit having a hot water storage tank for storing hot water having recovered exhaust heat of the power generation unit and the hot water supply combustor,
The energy supply system according to claim 1, wherein the antifreeze combustor is provided in each of the power generation unit and the heat source unit. When the fuel gas non-consumption state, which is required based on the duration for which the flow rate of the fuel gas remains below the set judgment amount, does not occur during the leakage judgment period, an alarm is activated or the fuel gas supply is cut off. A microcomputer meter, an energy supply unit including a power generation unit that generates power using fuel gas that has passed through the microcomputer meter, and an operation control unit that controls the operation of the energy supply unit are provided,
The energy supply unit is provided with a hot water supply combustor that burns using the fuel gas that has passed through the microcomputer meter,
When the hot water supply start condition is satisfied, the operation control unit performs hot water supply operation processing in which the hot water supply combustor is burnt until a hot water supply stop end condition is satisfied, and the power generation before the leakage determination period elapses. An energy supply system configured to execute a leakage determination avoidance stop process of stopping the operation of a part until a start prohibition release condition is satisfied,
The power generation unit is configured to include a reforming processing device that generates hydrogen gas by steam reforming the fuel gas, and a fuel cell to which the generated hydrogen gas is supplied,
The operation control unit,
As the leakage determination avoiding stop process, in the state where the supply of the fuel gas is stopped, steam is supplied to at least the inside of the reforming processing device of the reforming processing device and the fuel cell to discharge the internal gas. In a state where the steam supply process and the supply of steam are stopped, at least the inside of the reforming processing device of the reforming processing device and the fuel cell is filled with a fuel gas that has passed through the microcomputer meter and sealed. When the replenishment start condition of the fuel gas is satisfied and then the replenishment stop condition is satisfied, the fuel gas is fed through the microcomputer meter until the replenishment stop condition is satisfied. Configured to perform a replenishing pressure-holding process, and
When the hot water supply operation process is executed during the execution of the leakage determination avoidance stop process, the elapsed time after the hot water supply operation process is stopped is the set elapsed time for generating the fuel gas non-consumption state. An energy supply system configured to execute the pressure holding process after the set elapsed time has elapsed when the replenishment start condition is satisfied before the time elapses. The fuel gas non-consumption state is a state in which the duration continues for a set duration,
The energy supply system according to claim 1, wherein the set elapsed time is set to a time corresponding to the set duration. The fuel gas non-consumption state is a state in which the integrated value of the duration when the duration is a set determination time or more is a set value or more,
The energy supply system according to any one of claims 1 to 6, wherein the set elapsed time is set to a time corresponding to the set determination time.

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