JP2017022079A - Energy supply system - Google Patents

Abstract

An energy supply system capable of reducing the time for stopping a power generation unit by executing a leakage determination avoidance stop process. When the operation control unit C stops the power generation unit Ha, the operation control unit C performs a filling process in which the fuel gas is filled in the reforming apparatus 3 to a set appropriate pressure and then sealed. When the gas filling pressure is reduced to the lower limit filling pressure, a stop storage process for performing a pressure holding process for replenishing the fuel gas to the set appropriate pressure is performed, and power generation is performed before the leakage determination period elapses. As the leakage determination avoidance stop process that stops the operation of the part Ha until the setting cancellation condition is satisfied, when the filling process is performed and then the fuel gas filling pressure is lowered to the lower limit filling pressure, the high pressure higher than the set appropriate pressure The high pressure holding process for replenishing the fuel gas to the set pressure is performed. [Selection] Figure 1

Description

In the present invention, when the fuel gas non-consumption state in which the flow rate of the fuel gas is equal to or less than the set determination amount does not occur during the leakage determination period, the alarm is activated or the fuel gas is discharged. A microcomputer meter that cuts off the supply, an energy supply unit that includes a power generation unit that generates power using fuel gas via the microcomputer meter, and an operation control unit that controls the operation of the energy supply unit are provided,
The power generation unit is configured to include a reforming 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 is
When stopping the power generation unit, a filling process is performed in which the reforming apparatus is filled with the fuel gas that has passed through the microcomputer meter at a set appropriate pressure and sealed, and then the fuel gas filling pressure is set. Is reduced to the lower limit filling pressure, and is configured to perform a stop storage process for performing a pressure holding process for replenishing the set gas to the set appropriate pressure, and
The present invention relates to an energy supply system configured to execute leakage determination avoidance stop processing for stopping operation of the power generation unit until a setting cancellation condition is satisfied before the leakage determination period elapses.

  For example, such an energy supply system is installed in an ordinary household and supplies electric power consumed in the ordinary household. By the way, the energy supply unit includes a power supply unit that includes only a power generation unit, and a heat source unit that includes a hot water storage tank that stores hot water that has recovered exhaust heat from the power generation unit in addition to the power generation unit. Some are configured as a combined heat and power unit.

  Further, in such an energy supply system, in the case where the power generation unit is configured by the reforming processing device and the fuel cell, when the power generation unit is stopped, by performing a stop storage process, outside air is generated inside the reforming processing device. It is possible to avoid the intrusion and deterioration of various catalysts included in the reforming apparatus.

  In addition, the operation control unit executes a leakage determination avoidance stop process for stopping the operation of the power generation unit until the setting cancellation condition is satisfied before the leakage determination period elapses, so that the microcomputer meter performs an alarm operation or It is intended to avoid shutting off the supply of fuel gas.

That is, when the power generation unit continues operation beyond the leakage determination period (for example, 30 days), the state in which the fuel gas flow rate is equal to or less than the set determination amount (for example, 1.0 L / h) is set to the set duration ( For example, the fuel gas non-consumption state that lasts for 60 minutes does not occur during the leakage determination period, so that the microcomputer meter performs an alarm operation or shuts off the fuel gas supply.
Incidentally, the alarm operation by the microcomputer meter is generally configured to cause the alarm display unit (LED) to blink. If the flashing operation of the alarm display unit (LED) is continued, the battery of the microcomputer meter is consumed, and when the battery capacity decreases, the microcomputer meter is configured to cut off the supply of fuel gas.

When the microcomputer meter is activated, for example, the worker who has received the report has the trouble of shutting off the gas supply and checking whether or not fuel gas is actually leaking. In addition, when the microcomputer meter shuts off the fuel gas supply, not only is it troublesome to restore the microcomputer meter to the fuel gas supply state, but also the power generation unit stopped due to the fuel gas supply stoppage. Therefore, the operation control unit executes the leakage determination avoidance stop process to prevent the microcomputer meter from shutting off the fuel gas supply. (For example, refer to Patent Document 1 and Patent Document 2).
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.

  In Patent Document 1, the operation control unit stops the operation of the power generation unit on the day (28 days) corresponding to 2 days before the leakage determination period (30 days) or the day (29 days) corresponding to 1 day before, Then, after stopping the operation of the power generation unit, it is determined whether or not the time during which fuel gas is not supplied to the energy supply unit has continued for a predetermined time (60 minutes) corresponding to the set duration (60 minutes), When the predetermined time is continued, the power generation unit is restarted assuming that the setting cancellation condition is satisfied.

  In Patent Document 2, the power generation unit is stopped all day on a day (27 days) corresponding to 3 days before the leakage determination period (30 days), and when one day has passed, the setting cancellation condition is satisfied. In this state, the operation of the power generation unit is permitted.

  In Patent Document 1 and Patent Document 2, a detailed description of stopping the power generation unit when executing the leakage determination avoidance stop process is omitted, but in general, the leakage determination avoidance stop process is performed. Even when it is executed, a normal stop storage process is executed (see, for example, Patent Document 3 and Patent Document 4).

That is, in Patent Document 3 and Patent Document 4, when stopping the power generation unit, a filling process is performed in which the reforming apparatus is filled with fuel gas via a microcomputer meter at a set appropriate pressure and sealed. After that, when the fuel gas filling pressure is lowered to the lower limit filling pressure, the stop storage process is executed to execute the pressure holding process for replenishing the fuel gas to the set appropriate pressure.
Therefore, as the leakage determination avoidance stop process, the filling process is executed, and then, when the fuel gas filling pressure decreases to the lower limit filling pressure, the pressure holding process for replenishing the fuel gas to the set appropriate pressure is executed. Become.

  As described above, the pressure holding process is performed after the filling process even when the fuel gas is filled to the set appropriate pressure in the reforming apparatus by the filling process. This is because the fuel gas contracts and the filling pressure of the fuel gas decreases.

  Incidentally, in Patent Document 3, in a state where the supply of the fuel gas is stopped before the filling process, a steam supply process is performed in which steam is supplied into the reforming apparatus and the gas in the apparatus is discharged. In addition, it is described that the filling process is performed in a state where the supply of water vapor is stopped.

JP 2005-353292 A JP 2008-190755 A Japanese Patent No. 4909339 Japanese Patent No. 5607951

  In a conventional energy supply system, a time during which a fuel gas is not supplied to the energy supply unit by performing a pressure holding process until a considerable time (for example, several hours) elapses after the power generation unit is stopped. There is a possibility that the state does not exceed the set duration (for example, 60 minutes), and improvement is desired.

  That is, when the fuel gas filling pressure is reduced to the lower limit filling pressure, the pressure holding process is executed in a form in which the fuel gas is replenished to the set appropriate pressure. Since a low pressure (for example, 1.0 kPa) is set in consideration of the pressure and the like, the fuel gas is replenished to the set appropriate pressure until a considerable time has elapsed after the power generation unit is stopped. After that, before the set duration time (for example, 60 minutes) elapses, the fuel gas filling pressure is reduced to the lower limit filling pressure (for example, 0.5 kPa), and the fuel gas filling is started. As a result, there is a possibility that the time for stopping the power generation unit may become longer due to the execution of the leakage determination avoidance stop process.

  In other words, the temperature of the reforming apparatus is high immediately after the stop, but the temperature decreases with time, and the decrease in temperature decreases with time. After that, the interval time until the filling pressure of the fuel gas decreases to the lower limit filling pressure (for example, 0.5 kPa) becomes longer as the time elapses from the stop point of the power generation unit.

  Accordingly, when a considerable time (for example, several hours) has elapsed since the power generation unit was stopped, the reforming apparatus is configured to stop the power generation unit, although the interval time becomes longer than the set duration (for example, 60 minutes). While the temperature is high, the interval time does not become longer than the set duration (for example, 60 minutes).

  In short, conventionally, if a considerable time has not elapsed since the power generation unit was stopped, the time during which fuel gas is not supplied to the energy supply unit does not exceed the set duration (for example, 60 minutes). There is a possibility that the time for stopping the power generation unit by the execution of the leakage determination avoidance stop process becomes considerably long.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an energy supply system capable of shortening the time for stopping the power generation unit by executing the leakage determination avoidance stop process. In the point.

The energy supply system of the present invention operates when a state in which the flow rate of the fuel gas is equal to or less than the set determination amount does not occur during the leakage determination period when the fuel gas non-consumption state that continues for the set duration time does not occur. Alternatively, a microcomputer meter that cuts off the supply of the fuel gas, an energy supply unit that includes a power generation unit that generates power using the fuel gas via the microcomputer meter, and an operation control unit that controls the operation of the energy supply unit are provided. ,
The power generation unit is configured to include a reforming 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 is
When stopping the power generation unit, a filling process is performed in which the reforming apparatus is filled with the fuel gas that has passed through the microcomputer meter at a set appropriate pressure and sealed, and then the fuel gas filling pressure is set. Is reduced to the lower limit filling pressure, and is configured to perform a stop storage process for performing a pressure holding process for replenishing the set gas to the set appropriate pressure, and
Before the elapse of the leakage determination period, it is configured to execute a leakage determination avoidance stop process for stopping the operation of the power generation unit until a setting cancellation condition is satisfied. ,
When the operation control unit executes the filling process as the leakage determination avoidance stop process, and then the fuel gas filling pressure is reduced to the lower limit filling pressure, the operation control unit has a higher set pressure for higher pressure than the set appropriate pressure. The high pressure holding process for replenishing the fuel gas is performed.

That is, the filling process is executed as the leakage determination avoidance stop process, and then the high-pressure holding process is executed.
When the fuel gas filling pressure is reduced to the lower limit filling pressure, a process for replenishing the fuel gas to the high set pressure that is higher than the set appropriate pressure is executed as the high pressure holding process.

  As described above, in the leakage determination avoidance stop process, when the fuel gas filling pressure is reduced to the lower limit filling pressure, the high pressure holding process for replenishing the fuel gas to the high pressure set pressure higher than the set appropriate pressure is executed. Therefore, after the fuel gas is replenished to a set pressure for high pressure higher than the set appropriate pressure, the interval time until the fuel gas filling pressure drops to the lower limit filling pressure is replenished to the set appropriate pressure. After that, the fuel gas filling pressure becomes longer than the interval time until the lowering filling pressure is lowered.

  Therefore, after replenishing the fuel gas to the high pressure setting pressure, the interval time until the fuel gas filling pressure drops to the lower limit filling pressure becomes longer, so even if a long time has not passed since the power generation unit stopped, A state in which the interval time becomes longer than the set duration time can appear, and as a result, the time for stopping the power generation unit can be shortened by the leakage determination avoidance stop process.

  In short, according to the energy supply system of the present invention, it is possible to reduce the time for stopping the power generation unit by executing the leakage determination avoidance stop process.

  Moreover, the further characteristic structure of the energy supply system of this invention exists in the point which equips the said energy supply part with the heat source part which has the hot water storage tank which stores the hot water which collect | recovered the waste heat of the said electric power generation part.

  That is, since the energy supply unit includes the heat source unit, the hot water recovered from the exhaust heat of the power generation unit can be stored in the hot water storage tank, and hot water can be supplied using the stored hot water.

  In short, according to the energy supply system of the present invention, hot water can be supplied using the hot water recovered from the exhaust heat of the power generation unit.

  Further, according to a further characteristic configuration of the energy supply system of the present invention, even when the operation control unit performs the leakage determination avoidance stop process and the set processing scheduled time elapses, the energy supply unit When the non-supply continuation time, which is the continuation time of the state in which fuel gas is not supplied, does not exceed the set continuation time, the high pressure holding process and a warning process for performing a warning to stop the consumption of fuel gas are performed. In that it is configured to run.

  That is, during the execution of the leakage determination avoidance stop process, the non-supply continuation time which is the continuation time in which the fuel gas is not supplied to the energy supply unit even if the set process scheduled time (for example, 12 hours) has elapsed. When a state exceeding the set duration (for example, 60 minutes) does not occur, a high-pressure holding process and a warning process for performing a warning to stop the consumption of fuel gas are executed.

  Therefore, when the warning process is executed, the user refrains from consuming fuel gas, so that the non-supply continuation time, which is the continuation time when fuel gas is not supplied to the energy supply unit, is set to the set continuation time ( For example, a state exceeding 60 minutes) can be appropriately displayed, so that a state in which the time during which fuel gas is not supplied to the energy supply unit is equal to or longer than the set duration is easily displayed.

  In addition, when the warning process is performed, the high-pressure holding process is performed. Therefore, when the warning process is performed, when the user refrains from using the fuel gas, the fuel gas is charged. Since it is possible to avoid the pressure from becoming the lower limit filling pressure, it is possible to appropriately cause a state in which the time during which the fuel gas is not supplied to the energy supply unit is equal to or longer than the set duration.

  During the execution of the leakage determination avoidance stop process, if the non-supply duration time does not exceed the set duration time even if the set processing scheduled time has elapsed, the high pressure holding process and the warning process are performed. , The high pressure holding process and the warning process may be started at the same time, or one of the high pressure holding process and the warning process is started first, and the start point of the process The other process may be started when a preset delay time has elapsed. In addition, when the high-pressure pressure holding process is started first, the warning process is started at the end of the high-pressure pressure holding process, that is, the high-pressure pressure holding process may be started before the warning process is performed. Good.

  In short, according to the further characteristic configuration of the energy supply system of the present invention, a state in which the time during which the fuel gas is not supplied to the energy supply unit is equal to or longer than the set continuation time can be made to appear appropriately.

Further, a further characteristic configuration of the energy supply system of the present invention is provided with a pressure sensor for detecting the pressure of the fuel gas filled in the reforming treatment apparatus,
The operation control unit is configured to execute the pressure holding process and the high pressure pressure holding process based on detection information of the pressure sensor.

  That is, while the pressure sensor detects the pressure of the fuel gas charged in the reforming apparatus, the pressure holding process in the stop storage process and the leakage determination avoidance stop process are performed based on the detection information of the pressure sensor. The high pressure holding process is executed.

  As described above, since the pressure holding process and the high pressure pressure holding process are performed based on the detection information of the pressure sensor that detects the pressure of the fuel gas filled in the reforming apparatus, the reforming apparatus is filled. The pressure holding process and the high pressure holding process can be appropriately performed while accurately grasping the pressure of the fuel gas.

  In short, according to the further characteristic configuration of the energy supply system of the present invention, the pressure holding process and the pressure holding process for high pressure can be appropriately performed.

Schematic configuration diagram of energy supply system Block diagram showing the configuration of the reforming apparatus Flow chart showing stop storage process of reforming processing apparatus Table showing valve open / close status during stop storage process of reformer The flowchart which shows the leak determination avoidance process of 1st Embodiment. Flowchart showing a high pressure holding process according to the first embodiment. The figure which shows the filling timing of the fuel gas in the pressure-holding process of 1st Embodiment. The figure which shows the filling timing of the fuel gas in the high pressure holding | maintenance process of 1st Embodiment. The flowchart which shows the leak determination avoidance process of 2nd Embodiment. Schematic configuration diagram showing another embodiment of the energy supply system The figure which shows the filling timing of the fuel gas in the pressure-holding process of another embodiment. The figure which shows the filling timing of the fuel gas in the holding | maintenance process for high pressure of another embodiment

[First Embodiment]
Hereinafter, an energy supply system according to the present invention will be described with reference to the drawings.
(Entire configuration of energy supply unit)
As shown in FIG. 1, the energy supply system includes a combined heat and power supply unit as an energy supply unit H including a power generation unit Ha that generates power using a fuel gas G that passes through a microcomputer meter M and a heat source unit Hb. The section Hb is provided with a hot water storage tank 1 for storing hot water from which the exhaust heat of the power generation section Ha has been collected, and an auxiliary heat source machine 2 for burning using the fuel gas G via the microcomputer meter M.

The microcomputer meter M leaks a fuel gas non-consumption state in which the state in which the flow rate of the fuel gas G is equal to or less than a set determination amount (for example, 1.0 L / h) continues for a set duration (for example, 60 minutes). When it does not occur during the determination period (for example, 30 days), it has a function of operating an alarm or shutting off the supply of the fuel gas G, and details thereof are well known. Is omitted.
Incidentally, the fuel gas G is a gas containing hydrocarbons such as city gas and propane gas.

The power generation unit Ha includes a reforming apparatus 3 that generates a hydrogen-containing gas by steam reforming the fuel gas G, and a solid polymer fuel cell 4 to which the generated 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 a flow passage 4d through which cooling water flows between the fuel electrode 4n and the oxygen electrode 4s. Is provided.

Cooling water circulation path 5A for recovering the heat generated by the fuel cell 4 with cooling water, hot water circulation path 5B for circulating hot water in the hot water storage tank 1, and cooling water circulating in the cooling water circulation path 5A and hot water circulation path 5B are circulated. There is provided a heat exchanging section 5C for exchanging heat with the hot and cold water.
The cooling water circulation path 5A is provided with a cooling water circulation pump Pa and a cooling water storage tank Q, and the hot water circulation path 5B is provided with a hot water circulation pump Pb.

  The hot water flowing through the hot water circulation path 5B is heated by the cooling water circulating through the cooling water circulation path 5A, whereby hot hot water is stored in the hot water storage tank 1, and the hot water stored is used for hot water supply and heating. In addition, when the amount of heat stored in the hot water storage tank 1 is insufficient, the auxiliary heat source unit 2 is configured to operate, and details thereof will be described later.

A grid interconnection inverter 6 is provided on the power output side of the fuel cell 4. The inverter 6 has the same voltage and the same frequency as the received power for receiving the generated power of the fuel cell 4 from the commercial power supply 7. It is configured to be
The commercial power source 7 is, for example, a single-phase three-wire system 100/200 V, and is electrically connected to a power load 9 such as a television, a refrigerator, or 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. It is configured as follows.

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

The electric heater 12 includes a plurality of electric heater portions, and the electric heater 12 is provided so as to heat the hot water flowing through the hot water circulation path 5B described above.
The plurality of electric heater portions of the electric heater 12 are switched ON / OFF by the switch circuit 13. The switch circuit 13 is configured to adjust the power consumption of the electric heater 12 according to the amount of surplus power so that the power consumption of the electric heater 12 increases as the amount of surplus power increases.

The power generation unit Ha is provided with a power generation control unit Ca that controls the operation of the reforming apparatus 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 be able to communicate various types of information. Further, the power generation control unit Ca and the heat source control unit Cb are provided with an operation start command, an operation stop command, and the like. A remote controller R for instructing various types of information is provided.

(Modification equipment)
Next, the reforming apparatus 3 will be described. As shown in FIG. 2, a fuel supply path 16 for pressure-feeding the fuel gas G via the microcomputer meter M by the fuel pump 15 is provided. A desulfurizer 17 that desulfurizes the fuel gas G supplied is provided.
A steam generator 18 is provided that vaporizes the supplied water to generate steam, and the desulfurized fuel gas from the desulfurizer 17 is reformed with the steam from the steam generator 18 to generate a hydrogen-containing gas. A mass device 19 is provided.

  In addition, the carbon dioxide contained in the reformed gas reformed by the reformer 19 is transformed to carbon dioxide, and the total amount of the transformed gas transformed by the transformer 20 is supplied. Then, a gas cooler 21 that cools the water vapor in the supplied metamorphic gas to condense, and a steam / water separator 22 that separates the condensed water in which the water vapor in the metamorphic gas is condensed by cooling by the gas cooler 21. Is provided.

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

  Incidentally, in the normal operation, the gas cooler 21 and the steam separator 22 separate water vapor in the metamorphic gas that has been subjected to the metamorphic treatment in the transformer 20 as described above, and will be described later. In the gas purge process, water vapor remaining in the reforming apparatus 3 is separated.

  As described above, the reforming apparatus 3 generates the hydrogen-containing gas by steam reforming the fuel gas G supplied through the fuel supply path 16 in the reformer 19 and generating the hydrogen-containing gas in the reformer 19. The hydrogen-containing gas is passed in the order of the transformer 20 and the carbon monoxide selective oxidizer 23 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. As fuel gas, it is configured to be supplied to the fuel cell 4 through the fuel cell supply path 24.

(Details of reforming equipment)
Hereinafter, each part of the reforming apparatus 3 will be described.
As apparent from the above description, the fuel gas G supplied through the fuel supply path 16 is converted into the desulfurizer 17, the reformer 19, the transformer 20, the gas cooler 21, the steam separator 22, and the carbon monoxide selective oxidation. Therefore, the desulfurizer 17, the reformer 19, the transformer 20, the gas cooler 21, the steam separator 22, and the carbon monoxide selective oxidizer 23 are arranged in the order described in the gas treatment flow path 27. Connected at.

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 discharged from the fuel electrode 4n of the fuel cell 4 (hereinafter abbreviated as off-gas). An off gas passage 26 is provided for supplying the off gas as a combustion gas to the reformer burner 19a of the reformer 19.
That is, the off-gas after the power generation reaction discharged from the fuel cell 4 is burned by the reformer burner 19a with the combustion air from the combustion air passage 29, and the reforming catalyst can undergo the reforming reaction. It is comprised so that it may heat.

  A water vapor path 28 for introducing water vapor from the water vapor generator 18 is connected to a gas processing flow path 27 that connects the desulfurizer 17 and the reformer 19, and the fuel gas G desulfurized by the desulfurizer 17 and water vapor generation. The steam generated in the vessel 18 is supplied to the reformer 19.

  The fuel supply passage 16 is provided with a fuel valve V1 for intermittently supplying the fuel gas G, the fuel cell supply passage 24 is provided with a product gas outlet valve V2, and the off-gas passage 26 is provided with a reformer burner. A battery outlet valve V6 for intermittently supplying the off gas to the 19a is provided, and a combustion air valve V10 for intermittently supplying the combustion air to the reformer burner 19a is provided in the combustion air passage 29. .

  Although illustration is omitted, a fuel supply path for supplying the fuel gas G via the microcomputer meter M to the reformer burner 19a is provided at the time of startup or the like, and fuel supply is intermittently supplied to the fuel supply path. An intermittent valve is equipped.

A battery bypass passage 30 is branched from a location upstream of the product gas outlet valve V2 in the fuel cell supply passage 24, and the battery bypass passage 30 is located downstream of the battery 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 for opening and closing the passage.

  In the steam generator 18, heat exchange can be performed between the combustion gas flow portion 18 a through which the combustion gas discharged from the reformer burner 19 a flows and the evaporation portion 18 b to which water is supplied through the reformed water supply path 31. The steam is generated by evaporating water using the combustion gas discharged from the reformer burner 19a of the reformer 19 as a heat source.

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

The desulfurization recycle path 25 is provided in a form that connects the gas phase portion 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 that opens and closes the flow path. ing.
A selective oxidation air passage 33 for supplying 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 flow passage. ing.

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

  Incidentally, the fuel supply path 16, the gas processing path 27, the steam path 28, the reforming water supply path 31, the reforming water discharge path 32, the desulfurizer 17, the steam generator 18, the reformer 19, the transformer 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 processing path leading to the reactor 23, the reformer temperature sensor 34 detects the temperature of the highest temperature part in the gas processing path.

  The detection information of the reformer temperature sensor 34 and the pressure sensor 35 is input to the power generation control unit Ca, and the power generation control unit Ca starts up the operation of the reforming apparatus 3, steady operation (normal operation), stop operation, and the like. Are configured to perform opening / closing control of the valves V1 to V4 and V6 to V10.

(Stopping storage operation of the power generation unit)
Next, the stop storage operation when the reforming treatment apparatus 3 and the fuel cell 4 are stopped and stored will be described.
When the power generation control unit Ca performs the stop storage operation in which the reforming processing device 3 and the fuel cell 4 are stopped and stored, the steam generator is stopped in a state where the supply of the fuel gas G through the fuel supply path 16 is stopped. By continuing the generation of water vapor by 18, water vapor is supplied to the interior of the reforming apparatus 3, and the gas in the apparatus inside the reforming apparatus 3 is discharged (hereinafter referred to as a steam purge process). Next, the supply of water to the steam generator 18 is stopped, the water is discharged from the interior of the steam generator 18, and the reformer 3 is passed through the microcomputer meter M. A filling process for filling and sealing the fuel gas G as a purge gas (hereinafter referred to as a gas purge process) is performed.

  Further, after the gas purge process, the power generation control unit Ca replenishes the reformer 3 with fuel gas G via the microcomputer meter M so as to keep the pressure inside the reformer 3 at the set pressure. The pressure holding process is performed.

  In the final stage of the steam purge process, a temperature lowering process for lowering the temperature of the reforming apparatus 3 is performed, and in the final stage of the gas purge process, a sealing process for sealing the fuel gas G is performed. become.

Hereinafter, based on FIG. 3, the control operation of the power generation control unit Ca in the stopped storage operation in which the operation of the reforming apparatus 3 and the fuel cell 4 is stopped and stored will be described. FIG. 4 shows the open / close states of the valves V1 to V4 and V6 to V10 by the control operation of the power generation control unit Ca.
Further, the power generation control unit Ca has a first set time, a second set time, a set temperature Ts, a first set pressure Ps1 as a set appropriate pressure, and a second set pressure Ps2 as a lower limit filling pressure. The details are described later.

  Incidentally, during the steady operation (normal operation) of the reformer 3 and the fuel cell 4, the fuel valve V1, the product gas outlet valve V2, the reformed water valve V3, the battery 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 (see FIG. 4).

In other words, during the steady operation (normal operation) of the reforming apparatus 3, the fuel gas G flows into the desulfurizer 17, and water is supplied to the steam generator 18 to generate steam. The steam thus generated flows into the fuel gas G desulfurized by the desulfurizer 17, and a hydrogen-containing gas having a low carbon monoxide concentration is generated by the reformer 19, the shifter 20, and the carbon monoxide selective oxidizer 23. The generated hydrogen-containing gas is supplied to the fuel cell 4.
The reformer burner 19a is supplied with off-gas and combustion air discharged from the fuel cell 4, the reforming catalyst is heated by the combustion of the off-gas, and the hydrogen-containing gas flowing out of the transformer 20 The reforming apparatus 3 is operated in a form in which a part is supplied to the desulfurizer 17 for desulfurization.

  When the stop condition is satisfied, for example, when an operation stop command is issued from the remote controller R, the power generation control unit Ca starts the water vapor purge process. That is, the fuel valve V1, the product gas outlet valve V2, the battery outlet valve V6, the desulfurization recycle valve V8, and the selective oxidation air valve V9 are closed, and the battery bypass valve V7 is opened to perform the steam purge processing start operation. The steam purge process (steam supply process) is started (# 1).

When the first set time has elapsed after performing the steam purge process start operation (# 2), the temperature lowering process start operation for closing the battery bypass valve V7 is performed (# 3).
When the temperature T detected by the reformer temperature sensor 34 is equal to or lower than the set temperature Ts after the temperature lowering start operation (# 4), the reforming water valve V3 is closed and the reforming water discharge valve V4 is opened, and the fuel valve A gas purge process start operation is performed to open V1 and close the combustion air valve V10 to start the gas purge process (# 5).

  When the second set time elapses (# 6), the reformed water discharge valve V4 is closed, and a water discharge end operation for ending the discharge of water from the steam generator 18 is performed (# 7). When the detected pressure P becomes equal to or higher than the first set pressure Ps1 (# 8), the fuel valve V1 is closed to perform a sealing process, and the gas purge process is terminated (# 9).

  Thereafter, the pressure holding process is executed. That is, when the detected pressure P of the pressure sensor 35 becomes equal to or lower than the second set pressure Ps2 that is lower than the first set pressure Ps1 (# 10), the fuel valve V1 is opened (# 11), and when the detected pressure P becomes equal to or higher than the first set pressure Ps1 (# 11). # 12) The fuel valve V1 is closed (# 13), and then the processing from # 10 is repeated, and when the stop storage is instructed (# 14), the stop storage processing is performed. Will end.

  Incidentally, when the operation of the reforming apparatus 3 is stopped, the product gas outlet valve V2 and the battery outlet valve V6 are closed, and the hydrogen-containing gas is sealed in the fuel cell 4, so that the reforming apparatus As a process for stopping the operation of the fuel cell 4 in accordance with the stop of the operation 3, a fuel consumption process for consuming residual hydrogen-containing gas is performed by performing a discharge operation.

(Supplementary explanation of stopped storage operation of the power generation unit)
In the steam purge process (steam supply process) in the stop storage operation in which the reforming apparatus 3 and the fuel cell 4 are stopped and stored, the supply of the fuel gas G and the hydrogen gas for the desulfurization process to the desulfurizer 17, The supply of the selective oxidation air to the carbon oxide selective oxidizer 23 is stopped and the generation of the hydrogen-containing gas is stopped, but the supply of water to the steam generator 18 is continued, so that the generation of steam is continued. Is done.
Thus, since the production | generation of water vapor | steam is continued, the gas in an apparatus which remained in the gas processing path with the produced | generated water vapor | steam is supplied to the reformer burner 19a through the battery bypass path 30.

  And since supply of the combustion air to the reformer burner 19a is continued, combustible gas such as fuel gas G and hydrogen gas in the gas in the apparatus burns in the reformer burner 19a, and the combustion The gas flows through the combustion gas flow passage 18a of the water vapor generator 18 and contributes to the water vapor generation, and is then discharged. By such a water vapor purge process (water vapor supply process), the reformer 3 The inside is replaced with water vapor.

  Incidentally, when the steam purge processing start operation is performed, the entire or substantially the entire amount of the gas in the apparatus remaining in the gas processing path is supplied to the reformer burner 19a, and the combustible gas is combusted. Since it is desirable, the first setting time is set to be longer than the time required for supplying the reformer burner 19a with the entire or substantially the entire amount of the gas in the residual apparatus at the time when the steam purge processing start operation is performed.

After the first set time has elapsed, the temperature lowering process is performed in a state where the supply of the gas in the apparatus to the reformer burner 19a is stopped, and the water supply to the steam generator 18 is continued in the temperature lowering process. Therefore, the water is vaporized by the heat storage of the reforming device 3 and the steam is filled inside the reforming device 3, so that the inside of the reforming device 3 becomes negative pressure and the outside air is reformed. Intrusion into the processing apparatus 3 is prevented.
Further, since the supply of combustion air to the reformer burner 19a is continued, the heat of the reformer 19 is carried by the combustion air and used as a heat source for water vaporization. The temperature lowering of the processing device 3 is promoted.

  After the temperature lowering process, a gas purge process for supplying the fuel gas G as a purge gas into the apparatus is performed. However, the supply of the fuel gas G as the purge gas can prevent carbon deposition due to thermal decomposition of the fuel gas G and It is necessary to carry out at a temperature that can prevent condensation of water vapor.

In other words, when the fuel gas G is supplied at a high temperature and the amount of water vapor is insufficient for the reforming reaction, the fuel gas G is thermally decomposed to deposit carbon, Therefore, the supply of the fuel gas G as the purge gas is performed in a state where the internal temperature of the reforming apparatus 3 is lowered to a temperature at which carbon deposition due to thermal decomposition can be prevented. There is a need to do.
Moreover, if the temperature drops too much, the residual water vapor inside the reforming treatment apparatus 3 may be condensed and adhere to each catalyst. Therefore, the supply of the fuel gas G as the purge gas is performed inside the reforming treatment apparatus 3. It is necessary to carry out in a state where the temperature is maintained at a temperature at which condensation of water vapor can be prevented.

  Therefore, the set temperature Ts is set to a temperature at which carbon deposition due to thermal decomposition of the fuel gas G can be prevented and water vapor can be prevented from condensing. For example, when 13 A city gas is used as the fuel gas G, the set temperature Ts is set. The temperature Ts is preferably set in the range of 150 to 450 ° C., more preferably in the range of 250 to 350 ° C.

In the gas purging process, water remaining in the steam generator 18 and the reforming water discharge path 32 is discharged, so that there is almost no steam in the reformer 19, so that the fuel gas G is supplied. However, the reforming reaction does not proceed, hydrogen is not generated, and the internal pressure of the reforming apparatus 3 can be prevented from increasing.
In addition, in the gas purge process, the fuel gas G is modified as a purge gas in the absence of a gas outlet, in parallel with the discharge of the water remaining in the steam generator 18 and the reforming water discharge path 32. It is supplied to the inside of the quality processing apparatus 3.

  Incidentally, most of the water vapor remaining in the reforming apparatus 3 before the fuel gas G is supplied as the purge gas is condensed in the gas cooler 21 as the gas purge process is executed. The condensed water is separated by the steam separator 22 and discharged to the outside. Therefore, even if the operation is stopped and the temperature inside the reforming treatment device 3 is lowered, the water vapor remains in each catalyst. Problems such as condensation on the top can be prevented.

  Further, the fuel gas G is injected when the internal pressure of the reforming processing apparatus 3 decreases and the pressure P detected by the pressure sensor 35 becomes equal to or lower than the second set pressure Ps2 due to the pressure holding process. Since the water concentration in the interior of 3 is further reduced, it is possible to more reliably prevent the problem that water vapor is condensed on each catalyst.

  Incidentally, in the state in which the inside of the reforming apparatus 3 is purged with the purge gas, it is necessary to prevent the outside air from entering the inside of the reforming apparatus 3, and therefore the first set pressure Ps1 and the second set pressure are set. Each of the pressures Ps2 is set to a positive pressure and lower than the apparatus design pressure.

  In the start-up operation for starting up the stopped reforming apparatus 3, first, the fuel gas G is supplied to the reformer burner 19a, and the combustion start process for starting the combustion of the reformer burner 19a is performed. Thereafter, when the temperature of the reformer 19 rises to a steam supply start temperature that can prevent the thermal decomposition of the fuel gas G and the condensation of the steam, the steam from the steam generator 18 is supplied, and the reformer 3 A steam replacement process is performed to replace the fuel gas G filled in the interior with steam, and then the fuel supply process for supplying the fuel gas G is started when the temperature of the reformer 19 rises to the reforming start temperature. However, since the details are well known, detailed description is omitted in this embodiment.

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

A hot water supply path 51 is provided at the top of the hot water storage tank 1, a hot water supply path 52 is provided at the bottom of the hot water storage tank 1, and the hot water supply path 51 is connected to the hot water supply mixing valve 45.
A water supply path 53 for supplying hot water from a water supply source such as tap water is connected to a first water supply path 53 a connected to the hot water supply mixing valve 45 and a second heat storage switching valve 50 provided in the hot water supply path 52. It branches off to the water supply channel 53b.

A multi-function circulation path 54 in which the multi-function circulation pump 40 is disposed is provided via the auxiliary heat source unit 2, the heating heat exchanger 43, the bath recuperation heat exchanger 44, and the three-way valve 48, The three-way valve 48 is connected to a branch path 51 a branched from the hot water outlet path 51, and a hot water supply path 52 is connected to the multifunction circulation path 54.
The heating heat exchanger 43 and the bath remedy heat exchanger 44 are arranged in parallel with the multi-function circulation path 54, and the heating electromagnetic valve 46 flows hot water through the heating heat exchanger 43. In addition, the solenoid valve 47 for bath remedy is arranged in the multi-function circuit 54 in such a form that the flow of hot water through the bath remedy heat exchanger 44 is interrupted.

In the multifunctional circulation path 54, a joint channel 55 that connects the downstream side portion of the auxiliary heat source machine 2 and the hot water extraction channel 51 is provided, and a tank proportional valve 49 is provided in the joint channel 55.
The heating circulation path 56 is provided in a state of passing through the heating heat exchanger 43, and the heating circulation pump 41 is provided in the heating circulation path 56.
A bath circulation path 57 is provided in a state of passing through the bath recuperation heat exchanger 44, and a bath recirculation circulation pump 42 is provided in the bath recirculation path 57.

  The heat source unit Hb supplies the heating medium to the heating terminal through the hot water supply operation in which the hot water from the hot water extraction channel 51 and the hot water from the first water supply channel 53a are mixed and supplied from the hot water supply channel 58, and the heating circulation channel 56. It is configured to perform a heating operation and a bath chasing operation for heating while circulating bath water through the bath circulation path 57.

Each of the hot water supply operation, the heating operation, and the bath retreat operation is performed using the hot water in 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 unit 2 is combusted. It is comprised so that.
For example, when performing a hot water supply operation, when the amount of stored hot water in the hot water storage tank 1 is large, hot water in the hot water storage tank 1 is supplied to the hot water supply mixing valve 45 through the hot water extraction passage 51. In this case, hot water from the second water supply passage 53 b is supplied to the hot water storage tank 1 through the hot water supply passage 52 through the heat storage switching valve 50.

  When performing hot water supply operation, when the amount of stored hot water in the hot water storage tank 1 is small, 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 through the heat storage switching valve 50, After being heated by the auxiliary heat source device 2, it flows through the combined flow channel 55 to the hot water extraction channel 51.

  When performing a heating operation or a bath retreat operation, when the amount of hot water stored in the hot water storage tank 1 is large, the hot water in the hot water storage tank 1 is supplied to the multifunctional circulation path 54 through the branch path 51a with the multifunction circulation pump 40 operated. , And the heating heat exchanger 43 and the bath heat exchanger 44 are made to flow, and then returned to the hot water storage tank 1 through the hot water supply passage 52.

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

(Leakage judgment avoidance process)
The power generation control unit Ca stops the operation of the power generation unit Ha until the setting cancellation condition is satisfied when 26 days corresponding to 4 days before the leakage determination period (for example, 30 days) of the microcomputer meter M has elapsed. Leakage determination avoidance stop processing and warning processing for displaying a message prompting to refrain from consumption of the fuel gas G on the remote controller R until the setting cancellation condition is satisfied are configured to be executed as leakage determination avoidance processing. Yes.

The power generation unit Ha is configured to include a reforming device 3 that generates hydrogen gas by steam reforming the fuel gas G, and a fuel cell 4 to which the generated hydrogen-containing gas is supplied. Therefore, the power generation control unit Ca performs the above-described stop storage operation process on the reforming apparatus 3 and the fuel cell 4 as the leakage determination avoidance stop process.
Incidentally, the fuel cell 4 performs the above-described fuel consumption processing.

  However, in this embodiment, in the leakage determination avoidance stop process, instead of the above-described pressure holding process, when the fuel gas G charging pressure is reduced to the second set pressure Ps2 as the lower limit charging pressure, the set appropriate pressure is set. The high pressure holding process for replenishing the fuel gas G to the high pressure setting pressure Ps3 higher than the first setting pressure Ps1 is executed.

  That is, in a state where the supply of the fuel gas G is stopped, a steam purge process (steam supply process) for supplying steam to the inside of the reforming apparatus 3 and discharging the gas in the apparatus, and a state where the supply of steam is stopped Then, a gas purge process (filling process) for filling and sealing the fuel gas G via the microcomputer meter M in the reforming processing apparatus 3 is sequentially performed, and then the fuel gas G filling pressure is set as the lower limit filling pressure. When the pressure drops to the second set pressure Ps2, the high-pressure holding process for replenishing the fuel gas G via the microcomputer meter M into the reforming apparatus 3 until the high-pressure set pressure Ps3 is reached is executed.

In addition, the non-supply continuation time, which is a continuation time when the fuel gas G is not supplied to the energy supply unit H (the power generation unit Ha and the heat source unit Hb), is set to a set continuation time (for example, 60 minutes). It is determined as a condition for reaching a corresponding predetermined time (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 for measuring 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, based on the detection information of the power generation side flow meter 59a and the heat source side flow meter 59b, the power generation control unit Ca does not supply the fuel gas G to each of the power generation unit Ha and the heat source unit Hb for a predetermined time ( For example, it is configured to determine whether or not 60 minutes has been reached.

  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, the power generation unit Ha depends on whether or not the fuel valve V1 is operated in an open state. It can be determined whether or not the fuel gas G has been supplied, and the heat source Hb can be determined whether or not the fuel gas G has been supplied depending on whether or not the auxiliary heat source unit 2 has been operated. Whether the time during which the fuel gas G is not supplied to the power generation unit Ha and the heat source unit Hb has reached a predetermined time (for example, 60 minutes) without the power generation side flow meter 59a and the heat source side flow meter 59b being installed. It may be determined whether or not.

  The warning process is a duration of a state in which the fuel gas G is not supplied to the energy supply unit H even if a set process scheduled time (for example, 12 hours) elapses during execution of the leakage determination avoidance stop process. When no non-supply continuation time exceeds a predetermined time (for example, 60 minutes) corresponding to a set continuation time (for example, 60 minutes), a warning is given to stop the consumption of the fuel gas G.

(Details of leak detection avoidance process)
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 or not the power generation unit Ha has been stopped (# 20). If the power generation unit Ha has not been stopped, it is 26 days corresponding to 4 days before the leakage determination period (for example, 30 days) of the microcomputer meter M. Is determined (# 21).

  When it is determined at # 21 that the 26th has passed, the start prohibition that prohibits the start of the power generation unit Ha is set (# 22), and then the reforming apparatus 3 and the fuel cell 4 are operated. A stop operation (water vapor purge process, gas purge process, fuel consumption process) to be stopped is executed (# 23), and then a high pressure holding process is executed (# 24).

As described above, when the detected pressure P of the pressure sensor 35 is equal to or lower than the second set pressure Ps2 that is lower than the first set pressure Ps1, the high pressure holding process opens the fuel valve V1 and sets the pressure higher than the first set pressure Ps1. When the pressure is higher than the high set pressure Ps3, the process of repeatedly closing the fuel valve V1 is repeated, details of which will be described later.
By the way, when it is determined in # 20 that the power generation unit Ha has been stopped, it is not necessary to execute the operation stop process (# 23), so that the process proceeds to the pressure holding process for high pressure # 24. Become.

  Next, a non-supply continuation time that is a continuation time in a state in which the fuel gas G is not supplied to the energy supply unit H (the power generation unit Ha and the heat source unit Hb) corresponds to a set continuation time (for example, 60 minutes). It is determined whether (for example, 60 minutes) has elapsed (# 25), and if it is determined that the non-supply continuation time has passed a predetermined time (for example, 60 minutes), the power generation unit Ha In order to permit activation, the activation prohibition is canceled (# 26).

  If it is determined at # 25 that the non-supply continuation time has not passed the predetermined time, it is determined whether or not the scheduled processing time (for example, 12 hours) has elapsed (# 27), and the processing schedule If the time has elapsed, a warning process for displaying a message on the remote control R for urging the consumption of the fuel gas G is executed (# 28).

  The flow chart of FIG. 5 is described on the assumption that the power generation unit Ha is in operation. However, when considering the case where the power generation unit Ha is stopped when 26 days have passed, After determining that it has been stopped in # 20, it is determined whether or not 26 days have passed, and when 26 days have passed, a process of setting startup prohibition that prohibits startup of the power generation unit Ha is set. Will be added.

Next, the high-pressure pressure holding process executed by the power generation control unit Ca will be described based on the flowchart of FIG.
First, it is determined whether or not the fuel gas G is being supplied (# 30). If the fuel gas G is not being supplied, the pressure P detected by the pressure sensor 35 is lower than the first set pressure Ps1. 2. It is determined whether or not the pressure is equal to or lower than the set pressure Ps2 (# 31). If the detected pressure P of the pressure sensor 35 is equal to or lower than the second set pressure Ps2, the fuel valve V1 is opened and the fuel gas G is charged. Is started (# 32).

Next, it is determined whether or not the detected pressure P of the pressure sensor 35 is equal to or higher than the high pressure set pressure Ps3 higher than the first set pressure Ps1 (# 33), and the detected pressure P of the pressure sensor 35 is the high pressure set pressure. When Ps3 or more is reached, the fuel valve V1 is closed and the filling of the fuel gas G is finished (# 34).
If it is determined at # 30 that the fuel gas G is being supplied, the process proceeds to # 33.

(Summary of the first embodiment)
In the first embodiment, as the leakage determination avoidance stop process, the water vapor supply process and the filling process are sequentially performed, and then, when the filling pressure of the fuel gas G falls below the second set pressure Ps2 as the lower limit filling pressure, A high pressure holding process for replenishing the fuel gas G to the high pressure set pressure Ps3 higher than the first set pressure Ps1 as the set appropriate pressure is executed.

  Thus, in the leakage determination avoidance stop process, the high-pressure holding process is executed, and therefore, after the fuel gas G is replenished to the high-pressure set pressure Ps3, the filling pressure of the fuel gas G is reduced to the lower limit. After the fuel gas G is replenished to the first set pressure Ps1 as the set appropriate pressure during the interval time (see FIG. 8) until the pressure drops to the second set pressure Ps2 as the pressure, the lower limit charge of the fuel gas G is filled. It becomes longer than the interval time (refer to FIG. 7) until the pressure falls to the second set pressure Ps2.

  Incidentally, in FIG. 7 and FIG. 8, the time interval indicated by T is 1 hour, and in FIG. 7, the supply amount at the time of replenishing the fuel gas G to the first set pressure Ps1 is the normal fuel amount. In FIG. 8, the supply amount when the fuel gas G is replenished to the high pressure setting pressure Ps3 is described as the fuel gas supply amount at high pressure.

Then, as shown in FIG. 7, after the fuel gas G is replenished to the first set pressure Ps1 as the set appropriate pressure, the filling pressure of the fuel gas G is decreased to the second set pressure Ps2 as the lower limit fill pressure. The interval time is about 30 minutes to 1 hour at the beginning of the pressure holding process.
On the other hand, as shown in FIG. 8, after the fuel gas G is replenished to the high pressure setting pressure Ps3, the interval time until the filling pressure of the fuel gas G decreases to the second setting pressure Ps2 as the lower limit filling pressure. However, it is about 1 to 2 hours in the initial stage when the high pressure holding process is started.

  Therefore, after the fuel gas G is replenished to the high pressure setting pressure Ps3, the interval time until the fuel gas G filling pressure decreases to the second setting pressure Ps2 as the lower limit filling pressure is from the initial stage of the high pressure holding process. Since it tends to be longer than 1 hour, a state where the interval time becomes longer than the set duration (for example, 60 minutes) can be displayed even if a long time has not elapsed since the power generation unit Ha was stopped. it can.

  Further, while the pressure sensor 35 detects the pressure of the fuel gas G filled in the reforming processing apparatus 3, the pressure holding process in the stop storage process and the leakage determination avoidance are performed based on the detection information of the pressure sensor 35. Since the high-pressure pressure holding process in the stop processing is executed, the pressure holding process and the high-pressure pressure holding process are appropriately performed while accurately grasping the pressure of the fuel gas G filled in the reforming processing device 3. Can be done.

  Further, in the present embodiment, the fuel gas G is not supplied to the energy supply unit H even when the set processing scheduled time (for example, 12 hours) elapses during execution of the leakage determination avoidance stop process. When a state in which the non-supply continuation time, which is the continuation time, does not exceed the set continuation time (for example, 60 minutes) does not occur, a warning process is performed to issue a warning so as to stop the consumption of the fuel gas G.

  Therefore, when the warning process is executed, the user refrains from consuming the fuel gas G, so that the non-supply continuation time, which is the duration of the state in which the fuel gas G is not supplied to the energy supply unit H, is set. Since a state exceeding the duration (for example, 60 minutes) can be appropriately displayed, it is easy to display a state in which the time during which the fuel gas G is not supplied to the energy supply unit H is longer than the set duration It becomes.

  Incidentally, in general, the fuel gas G from the microcomputer meter M is also supplied to a general gas appliance such as a gas stove. In this case, the general gas appliance is also used by the above warning process. It will be refrained.

[Second Embodiment]
Next, although 2nd Embodiment is described, this 2nd Embodiment shows another embodiment of the leak determination avoidance process which the control part Ca for electric power generation performs, Other structures are 1st Embodiment. Therefore, only different parts from the first embodiment will be described, and detailed description of the same configuration as the first embodiment will be omitted.

  In the second embodiment, even if the power generation control unit Ca constituting the operation control unit C performs the leakage determination avoidance stop process and the set processing scheduled time (for example, 12 hours) elapses, the energy When the state where the non-supply continuation time, which is the continuation time of the state in which the fuel gas G is not supplied to the supply unit H, does not exceed the set continuation time, the warning process is performed as in the first embodiment. Before performing the warning process, the high pressure holding process is executed.

That is, after the reforming apparatus 3 is filled with the fuel gas G until the detected pressure P of the pressure sensor 35 becomes equal to or higher than the high pressure set pressure Ps3 higher than the first set pressure Ps1, the consumption of the fuel gas G is stopped. In this way, a warning process for giving a warning is executed.
Incidentally, the warning process is a process for displaying on the remote control R a message for urging the consumption of the fuel gas G.

(Details of leak detection avoidance process)
Next, leakage determination avoidance processing executed by the power generation control unit Ca in the second embodiment will be described based on the flowchart of FIG. Note that the processing of # 60 to # 67 in the flowchart of FIG. 9 is processing corresponding to # 20 to # 27 in the flowchart of FIG.

  First, it is determined whether or not the power generation unit Ha has been stopped (# 60). If the power generation unit Ha has not been stopped, it is 26 days corresponding to 4 days before the leakage determination period (for example, 30 days) of the microcomputer meter M. Is determined (# 61).

When it is determined at # 61 that the 26th has passed, the start prohibition that prohibits the start of the power generation unit Ha is set (# 62), and then the reforming apparatus 3 and the fuel cell 4 are operated. A stop operation (water vapor purge process, gas purge process, fuel consumption process) to be stopped is executed (# 63), and then a high pressure holding process is executed (# 64).
By the way, when it is determined in # 60 that the power generation unit Ha has been stopped, it is not necessary to execute the operation stop process (# 63), so that the process proceeds to the pressure holding process for high pressure # 64. Become.

  Next, a non-supply continuation time that is a continuation time in a state in which the fuel gas G is not supplied to the energy supply unit H (the power generation unit Ha and the heat source unit Hb) corresponds to a set continuation time (for example, 60 minutes). It is determined whether (for example, 60 minutes) has elapsed (# 65), and if it is determined that the non-supply continuation time has passed a predetermined time (for example, 60 minutes), the power generation unit Ha In order to allow the activation, the activation prohibition is canceled (# 66), and then the process proceeds to # 60.

If it is determined in # 65 that the non-supply continuation time has not passed a predetermined time (for example, 60 minutes), then whether or not the scheduled processing time (for example, 12 hours) has elapsed Is determined (# 67).
If it is determined that the scheduled processing time has elapsed, the high pressure holding processing, that is, the fuel gas is supplied to the reforming processor 3 until the detected pressure P of the pressure sensor 35 becomes equal to or higher than the high pressure setting pressure Ps3. A process of filling G is executed (# 68), and then a warning process for displaying on the remote controller R a message prompting to refrain from consuming the fuel gas G is executed (# 71).

  If it is determined in # 67 that the scheduled processing time (for example, 12 hours) has not elapsed, the process proceeds to # 60.

  The flowchart in FIG. 9 is described on the assumption that the power generation unit Ha is in operation, but when considering the case where the power generation unit Ha is stopped at the time when 26 days have passed, After determining that it has been stopped in # 60, it is determined whether or not 26 days have passed. When 26 days have passed, a process of setting a startup prohibition that prohibits startup of the power generation unit Ha is set. Will be added.

(Summary of the second embodiment)
Since the second embodiment has the same configuration as the first embodiment, the water vapor supply process and the filling process are sequentially executed as the leakage determination avoidance stop process in the same manner as the first embodiment. When the filling pressure of the fuel gas G drops below the second set pressure Ps2 as the lower limit filling pressure, a high pressure holding process for replenishing the fuel gas G to the high pressure set pressure Ps3 higher than the first set pressure Ps1 is executed. Therefore, even if a long time has not elapsed since the time when the power generation unit Ha stopped, a state in which the interval time is longer than the set continuation time (for example, 60 minutes) from the initial stage of the high-pressure pressure holding process appears. Can be made.

  Further, while the pressure sensor 35 detects the pressure of the fuel gas G filled in the reforming processing apparatus 3, the pressure holding process in the stop storage process and the leakage determination avoidance are performed based on the detection information of the pressure sensor 35. Since the high-pressure pressure holding process in the stop processing is executed, the pressure holding process and the high-pressure pressure holding process are appropriately performed while accurately grasping the pressure of the fuel gas G filled in the reforming processing device 3. Can be done.

  In addition, during the execution of the leakage determination avoidance stop process, the non-supply that is the duration of the state in which the fuel gas G is not supplied to the energy supply unit H even if the set processing scheduled time (for example, 12 hours) has elapsed. When a state in which the duration time exceeds the set duration time (for example, 60 minutes) does not occur, a warning process for performing a warning to stop the consumption of the fuel gas G is executed, so that the fuel gas G is supplied to the energy supply unit H. It becomes easy to reveal a state in which the non-supply time is longer than the set duration.

  Furthermore, according to the present embodiment, the high-pressure pressure holding process is executed before the warning process is performed, so that the user consumes the fuel gas G by executing the warning process. Since it is possible to avoid that the filling pressure of the fuel gas G becomes equal to or lower than the second set pressure Ps2 as the lower limit filling pressure when it is reserved, the time during which the fuel gas G is not supplied to the energy supply unit H It is possible to appropriately present a state where is longer than the set duration.

  In the second embodiment, an example has been described in which, when it is determined that the scheduled processing time has elapsed, the high-pressure pressure holding processing is performed first, and the warning processing is started at the end of the processing. When it is determined that the scheduled processing time has elapsed, the high-pressure holding process and the warning process may be started simultaneously. Further, in the case where the high pressure holding process is started earlier than the warning process as in the second embodiment, the warning process is performed when a preset delay time has elapsed from the start time of the high pressure holding process. May start. In addition, when the warning process is started before the high-pressure pressure holding process, the high-pressure pressure holding process may be started when a preset delay time has elapsed from the start time of the warning process.

[Third Embodiment]
Next, a third embodiment will be described. This third embodiment shows another embodiment of the energy supply system, and other configurations are the same as those of the first embodiment. Only a different part from a form is demonstrated and detailed description is abbreviate | omitted about the structure similar to 1st Embodiment.

  That is, as shown in FIG. 10, the energy supply unit H is configured as a power supply unit including only the power generation unit Ha.

In the power generation unit Ha shown in FIG. 10, a radiator F that cools the cooling water is provided in the cooling water circulation path 5 </ b> A that recovers the heat generated by the fuel cell 4 with the cooling water. The radiator F is provided on the downstream side of the fuel cell 4 and on the upstream side of the cooling water storage tank Q.
Further, the electric heater 12 that consumes the surplus power of the fuel cell 4 by converting it into heat heats the cooling water flowing through the cooling water circulation channel 5A, and is downstream of the fuel cell 4 in the cooling water circulation channel 5A. And provided upstream of the radiator F.

  The radiator F is configured to perform an operation of cooling the cooling water by releasing the heat held by the cooling water flowing through the cooling water circulation path 5A to the outside during the operation of the fuel cell 4. The radiator F is configured to stop the operation of cooling the cooling water when the operation of the fuel cell 4 is stopped.

[Another embodiment]
Next, other embodiments are listed.
(1) In the first and second embodiments, the operation control unit C that controls the operation of the energy supply unit H controls the operation of the power generation control unit Ca that controls the operation of the power generation unit Ha and the operation of the heat source unit Hb. However, the power generation control unit Ca and the heat source control unit Cb are combined as one control unit, and the operation control unit C is configured as one control unit. You may implement with a form.

(2) In the first and second embodiments, the power generation unit Ha and the heat source unit Hb are illustrated as separate units. However, the power generation unit Ha and the heat source unit Hb are configured as a single unit. You may implement with the form to do.

(3) In the first to third embodiments, in the sealing process of the gas purge process (filling process), the fuel gas G is filled to the first set pressure Ps1 as an appropriate set pressure. In the processing, the fuel gas G may be filled in the high pressure setting pressure Ps3.

(4) In the first to third embodiments, the case where the pressure holding process and the high pressure pressure holding process are performed based on the detection information of the pressure sensor 35 is illustrated, but for example, as shown in FIGS. Thus, each time the temperature T detected by the reformer temperature sensor 34 decreases, the fuel valve V1 is opened for a set time and the fuel gas G is filled in a set amount. Various specific configurations of the processing and the pressure holding processing for high pressure can be made.

Incidentally, the above-described set temperature Ts is, for example, 30 ° C. in the pressure holding process, and is, for example, 50 ° C. in the pressure holding process for high pressure.
When the fuel gas G is charged based on the detected temperature T in this way, a set time (for example, 24 hours) elapses after the power generation unit Ha is stopped, or the detected temperature of the reformer temperature sensor 34 When T balances with the outside air temperature, the filling of the fuel gas G is stopped.

  Incidentally, when the pressure holding process and the high pressure pressure holding process are performed based on the detected temperature T of the reformer temperature sensor 34, the gas purge process (filling process) is closed and the reforming water discharge valve V4 is closed. When the set filling time elapses after the water discharge end operation, the fuel valve V1 may be closed.

(5) In the first to third embodiments, the solid polymer fuel cell is exemplified as the fuel cell 4 of the power generation unit Ha. However, various types of fuel cells such as a solid oxide fuel cell are exemplified. A fuel cell can be equipped, and the reforming apparatus 3 can also be equipped with various configurations according to the fuel cell 4 to be equipped.

(6) In the first to third embodiments, when the power generation unit Ha is stopped, the supply of the fuel gas G is stopped and water vapor is supplied to the interior of the reforming apparatus 3 to stop the power generation unit Ha. The steam supply process for discharging the gas and the filling process for filling and sealing the fuel gas G through the microcomputer meter M to the set appropriate pressure in a state where the supply of water vapor is stopped are sequentially executed. Then, although the case where the pressure holding process is performed was illustrated, depending on the configuration of the reforming processing apparatus 3, when stopping the power generation unit Ha, the steam supply process is omitted, the filling process is performed, and then the pressure holding process is performed. You may implement with the form which performs a pressure process.

(7) In the first to third embodiments, the case where the filling process and the pressure holding process are executed only for the reforming apparatus 3 of the power generation unit Ha and the reforming apparatus 3 of the fuel cell 4 is illustrated. However, the fuel gas G is filled in the reforming apparatus 3 and the fuel electrode 4n of the fuel cell 4, that is, the fuel electrode 4n of the fuel cell 4 is also used as a fuel gas all together with the reforming apparatus 3. You may implement so that a filling process and a pressure-holding process may be performed in the form which fills G.

(8) In the third embodiment, in the power generation unit Ha, the heat held by the cooling water that cools the fuel cell 4 is released to the outside by the radiator F. However, the present invention is not limited to this, and the fuel cell 4 is cooled. You may provide the thermal storage tank which stores the hot water which collect | recovered the heat which cooling water hold | maintains.

  The configuration disclosed in the above embodiment (including another embodiment, the same shall apply hereinafter) can be applied in combination with the configuration disclosed in the other embodiment, as long as no contradiction occurs. The embodiment disclosed in this specification is an exemplification, and the embodiment of the present invention is not limited to this. The embodiment can be appropriately modified without departing from the object of the present invention.

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 3 Reformation processing apparatus 4 Power generation part C Operation control part H Energy supply part Ha Power generation part Hb Heat source part M

Claims (4)

When the fuel gas non-consumption state in which the fuel gas flow rate is equal to or less than the set determination amount does not occur during the leakage determination 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 via the microcomputer meter, and an operation control unit that controls the operation of the energy supply unit are provided,
The power generation unit is configured to include a reforming 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 is
When stopping the power generation unit, a filling process is performed in which the reforming apparatus is filled with the fuel gas that has passed through the microcomputer meter at a set appropriate pressure and sealed, and then the fuel gas filling pressure is set. Is reduced to the lower limit filling pressure, and is configured to perform a stop storage process for performing a pressure holding process for replenishing the set gas to the set appropriate pressure, and
An energy supply system configured to execute a leakage determination avoidance stop process for stopping the operation of the power generation unit until a setting cancellation condition is satisfied before the leakage determination period elapses,
When the operation control unit executes the filling process as the leakage determination avoidance stop process, and then the fuel gas filling pressure is reduced to the lower limit filling pressure, the operation control unit has a higher set pressure for higher pressure than the set appropriate pressure. An energy supply system configured to perform a high pressure holding process for replenishing fuel gas.   The energy supply system according to claim 1, wherein the energy supply unit includes a heat source unit having a hot water storage tank for storing hot water from which the exhaust heat of the power generation unit is recovered.   A non-supply continuation time which is a continuation time in which fuel gas is not supplied to the energy supply unit even when the set processing scheduled time has elapsed while the operation control unit is executing the leakage determination avoidance stop process. 3. The pressure holding process for high pressure and the warning process for performing a warning for stopping the consumption of fuel gas are executed when a state exceeding the set duration does not occur. Energy supply system. A pressure sensor for detecting the pressure of the fuel gas filled in the reforming apparatus is provided;
The energy according to any one of claims 1 to 3, wherein the operation control unit is configured to execute the pressure holding process and the high pressure pressure holding process based on detection information of the pressure sensor. Supply system.

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