JP6521824B2 - Energy supply system - Google Patents

Description

According to the present invention, when the fuel gas non-consumption state in which the state in which the flow rate of the fuel gas becomes equal to or less than the set determination amount continues for the set duration time does not occur during the leak determination period, An energy supply unit including a microcomputer meter that shuts off supply, a power generation unit that generates electric power using fuel gas that passes through the microcomputer meter, and an operation control unit that controls the operation of the energy supply unit;
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
When stopping the power generation unit, a filling process is performed to fill the inside of the reforming processing apparatus with the fuel gas having passed through the microcomputer meter to a set appropriate pressure and seal the fuel gas, and thereafter, the filling pressure of the fuel gas When the pressure drops to the lower limit filling pressure, it is configured to perform stop storage processing for performing pressure holding processing for replenishing the fuel gas to the set appropriate pressure, and
The present invention relates to 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 has elapsed.

  Such an energy supply system is installed, for example, in a general household to supply power consumed by the general household. Incidentally, the energy supply unit includes a heat source unit having a hot water tank for storing hot and cold water from which the exhaust heat of the power generation unit has been recovered, in addition to the power supply unit configured as a power supply unit having only the power generation unit. There is one that is configured as a cogeneration unit.

  In addition, in the case where the energy supply system configures a power generation unit by the reforming processing device and the fuel cell, outside air is stored inside the reforming processing device by performing stop storage processing when stopping the power generation unit. It is made to be able to avoid that it invades and the various catalysts with which a reforming treatment device is equipped deteriorate.

  In addition, the microcomputer controller performs an alarm operation by executing the leakage determination avoidance stop process in which the operation control unit stops the operation of the power generation unit until the setting cancellation condition is satisfied before the leakage determination period elapses. It is intended to avoid interrupting the supply of fuel gas.

That is, when the power generation unit continues the operation beyond the leakage determination period (for example, 30 days), the state where the flow rate of the fuel gas becomes equal to or less than the set determination amount (for example, 1.0 L / h) For example, since the fuel gas non-consumption state which continues over 60 minutes does not occur during the leak determination period, the microcomputer meter operates the alarm or shuts off the supply of the fuel gas.
Incidentally, as an alarm operation by the microcomputer meter, generally, an alarm display unit (LED) is operated to blink. When the alarm display unit (LED) continues to blink, the microcomputer meter battery is consumed, and when the battery capacity decreases, the microcomputer meter is configured to shut off the supply of the fuel gas.

In the case where the microcomputer meter issues an alarm, for example, the worker who receives the notification has the trouble of shutting off the gas supply and checking whether the fuel gas actually leaks or not. In addition, when the microcomputer meter shuts off the fuel gas supply, not only there is a need to restore the microcomputer meter to the fuel gas supply state, but the power generation unit stopped by stopping the fuel gas supply. Since the operation control unit executes the leakage determination avoidance stop process to prevent the microcomputer meter from interrupting the supply of the fuel gas, it is necessary to perform complicated processes for restarting the engine. (See, for example, Patent Literature 1 and Patent Literature 2).
Patent Document 1 and Patent Document 2 describe the case where the energy supply unit is configured as a 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 a day (28 days) equivalent to 2 days before the leak determination period (30 days) or a day (29 days) equivalent to 1 day Then, after stopping the operation of the power generation unit, it is determined whether the time during which the fuel gas is not supplied to the energy supply unit continues for a predetermined time (60 minutes) corresponding to the setting continuation time (60 minutes), When the predetermined time is continued, it is configured to restart the power generation unit on the assumption that the setting cancellation condition is satisfied.

  In Patent Document 2, the power generation unit is stopped throughout the day on the day (27th) equivalent to 3 days before the leak judgment period (30th), and when 1 day elapses, the setting cancellation condition is satisfied. In this condition, the operation of the power generation unit is permitted.

  Although Patent Document 1 and Patent Document 2 omit the detailed description of stopping the power generation unit when the leakage determination avoidance stop process is executed, the leakage determination avoidance stop process is generally performed. Also when executing, a normal stop storage process will be performed (see, for example, Patent Document 3 and Patent Document 4).

That is, according to Patent Document 3 and Patent Document 4, when stopping the power generation unit, a filling process is performed in which the fuel gas passed through the microcomputer meter is filled to a set appropriate pressure and sealed inside the reforming treatment apparatus. After that, when the filling pressure of the fuel gas drops to the lower limit filling pressure, the stop storage process of performing the pressure holding process of replenishing the fuel gas to the set appropriate pressure is performed.
Therefore, even in the leakage judgment avoidance stop process, the filling process is performed, and thereafter, when the filling pressure of the fuel gas decreases to the lower limit filling pressure, the pressure holding process of replenishing the fuel gas to the set appropriate pressure is performed. Become.

  As described above, the reason that the pressure holding process is performed after the filling process is that even if the fuel gas is filled to the set appropriate pressure inside the reforming process apparatus by the filling process, the filling process is performed because the temperature of the reforming process apparatus is lowered. This is because the fuel gas contracts and the fuel gas filling pressure decreases.

  Incidentally, in Patent Document 3, before filling processing, steam supply processing is performed to supply steam inside the reforming processing apparatus and discharge the gas in the apparatus while stopping supply of fuel gas, and then It is described that the filling process is performed with the supply of water vapor stopped.

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

  In the conventional energy supply system, the time during which no fuel gas is supplied to the energy supply unit by execution of the 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, although the pressure holding process is performed in such a mode that the fuel gas is replenished to the set appropriate pressure when the filling pressure of the fuel gas decreases to the lower limit charged pressure, the set appropriate pressure is the seal of the reforming device. Since the pressure is set to a lower pressure (for example, 1.0 kPa) in consideration of the pressure etc., the fuel gas is replenished to the setting appropriate pressure until a considerable time elapses after the power generation unit is stopped. After that, before the set duration time (for example, 60 minutes) elapses, the fuel gas filling pressure decreases to the lower limit filling pressure (for example, 0.5 kPa), and the phenomenon that the fuel gas filling starts is generated. As a result, there is a risk that the time for stopping the power generation unit may become longer due to the execution of the leakage determination avoidance stop process.

  That is, although the temperature of the reforming treatment apparatus is high immediately after stopping, it becomes low as time passes, and the decrease in temperature decreases as time passes, so the fuel gas is replenished to the set appropriate pressure 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 time passes from the time when the power generation unit stops.

  Therefore, when a considerable amount of time (for example, several hours) elapses after the power generation unit is stopped, the power generation unit is stopped and the reforming processing apparatus is performed although the interval time is longer than the setting continuation time (for example, 60 minutes) While the temperature is high, the interval time will not be longer than the set duration (e.g., 60 minutes).

  In short, conventionally, the time in which the fuel gas is not supplied to the energy supply unit does not exceed the set duration (for example, 60 minutes) unless a considerable time has elapsed since the power generation unit was stopped. Due to the execution of the leakage determination avoidance stop process, the time for stopping the power generation unit may be considerably long.

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

The energy supply system according to the present invention operates as an alarm when there is no fuel gas non-consumption state in which the state in which the flow rate of the fuel gas becomes equal to or less than the set determination amount continues for the set duration time during the leak determination period. Alternatively, a microcomputer meter for interrupting the supply of fuel gas, an energy supply unit including a power generation unit for generating power using fuel gas via the microcomputer meter, and an operation control unit for controlling the operation of the energy supply unit are provided. ,
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
When stopping the power generation unit, a filling process is performed to fill the inside of the reforming processing apparatus with the fuel gas having passed through the microcomputer meter to a set appropriate pressure and seal the fuel gas, and thereafter, the filling pressure of the fuel gas When the pressure drops to the lower limit filling pressure, it is configured to perform stop storage processing for performing pressure holding processing for replenishing the fuel gas to the set appropriate pressure, and
It is configured to execute 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, and the characteristic configuration is ,
The operation control unit executes the filling process as the leakage determination avoidance stop process, and thereafter, when the filling pressure of the fuel gas decreases to the lower limit filling pressure, the high pressure setting pressure is higher than the setting appropriate pressure. The point is that it is configured to execute a high pressure holding process for replenishing the fuel gas.

That is, the filling process is performed as the leakage determination avoidance stop process, and then the high pressure holding process is performed.
Then, when the filling pressure of the fuel gas decreases to the lower limit filling pressure as the high-pressure holding process, a process of replenishing the fuel gas to the high-pressure setting pressure higher than the setting appropriate pressure is performed.

  As described above, in the leakage determination avoidance stop process, when the filling pressure of the fuel gas is lowered to the lower limit filling pressure, the high pressure holding pressure process of replenishing the fuel gas to the high pressure setting pressure higher than the setting appropriate pressure is executed. Therefore, after the fuel gas is replenished to the high pressure setting pressure higher than the setting appropriate pressure, the interval time until the filling pressure of the fuel gas decreases to the lower limit filling pressure is replenished with the fuel gas to the setting appropriate pressure After that, it becomes longer than the interval time until the filling pressure of the fuel gas decreases to the lower limit filling pressure.

  Therefore, after the fuel gas is replenished to the high pressure setting pressure, the interval time until the filling pressure of the fuel gas decreases to the lower limit filling pressure becomes long, so long time does not elapse from the stopping time of the power generation unit. A state in which the interval time is longer than the setting continuation time can be realized, and as a result, the leakage determination avoidance stop process can shorten the time for stopping the power generation unit.

  In short, according to the energy supply system of the present invention, the time for stopping the power generation unit can be shortened by the execution of the leakage determination avoidance stop process.

  Further, a still further characterizing feature of the energy supply system according to the present invention is that the energy supply unit includes a heat source unit having a hot water storage tank for storing hot and cold water from which the exhaust heat of the power generation unit is recovered.

  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 the hot water can be used to supply hot water.

  In short, according to the energy supply system of the present invention, it is possible to supply hot water using the hot water collected from the exhaust heat of the power generation unit.

  Further, according to a still further characterizing feature of the energy supply system of the present invention, the operation control unit is configured to send the energy supply unit to the energy supply unit even if a set processing scheduled time has elapsed while the leakage determination avoidance stop process is being executed. When the non-supply continuation time which is the continuation time of the state where the fuel gas is not supplied does not occur that the state where the setting continuation time does not occur, the high pressure pressure holding process and the warning process performing the warning to stop the consumption of the fuel gas It is in a point that is configured to run.

  That is, during the execution of the leakage judgment avoidance stop process, the non-supply continuation time which is the continuation time of the state where the fuel gas is not supplied to the energy supply unit even if the set processing scheduled time (for example, 12 hours) elapses. When the condition does not exceed the set duration (for example, 60 minutes), the high pressure holding process and the warning process for giving a warning to stop the consumption of the fuel gas are executed.

  Therefore, by performing the warning process, the user refrains from consuming the fuel gas, and the non-supply duration is the duration of the state where the fuel gas is not supplied to the energy supply unit. For example, since a state exceeding 60 minutes can be appropriately manifested, it becomes easy to reveal a state in which the time during which the fuel gas is not supplied to the energy supply unit becomes equal to or longer than the set continuation time.

  Moreover, since the high pressure holding processing is performed when the warning processing is performed, the fuel gas filling can be performed when the user refrains from consuming the fuel gas by the execution of the warning processing. Since it is possible to prevent the pressure from becoming the lower limit filling pressure, it is possible to properly reveal 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.

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

  In short, according to the further characterizing feature of the energy supply system of the present invention, it is possible to appropriately reveal a state in which the time during which the fuel gas is not supplied to the energy supply unit becomes equal to or longer than the set duration.

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

  That is, while the pressure of the fuel gas with which the reforming processing apparatus is filled is detected by the pressure sensor, based on the detection information of the pressure sensor, the pressure holding process in the stop storage process and the stop process for leakage judgment avoidance The high pressure holding processing will be performed.

  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 with which the reforming treatment apparatus is charged, The pressure holding process and the high pressure pressure holding process can be appropriately performed while accurately grasping the pressure of the fuel gas.

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

Schematic diagram of energy supply system Block diagram showing the configuration of the reformer Flow chart showing stop storage processing of the reformer A table showing valve open / close states in stop storage processing of the reformer Flow chart showing leakage judgment avoidance processing of the first embodiment Flow chart showing high pressure holding processing of the first embodiment FIG. 6 is a diagram showing the fuel gas charging timing in the pressure holding process of the first embodiment. FIG. 6 is a diagram showing the fuel gas charging timing in the high pressure holding pressure processing of the first embodiment. Flow chart showing leakage judgment avoidance processing of the second embodiment Schematic block 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 A diagram showing the fuel gas charging timing in the high pressure holding processing of another embodiment

First Embodiment
Hereinafter, an energy supply system according to the present invention will be described based on the drawings.
(Overall configuration of the energy supply unit)
As shown in FIG. 1, the energy supply system includes a heat and power supply unit as an energy supply unit H including a power generation unit Ha that generates electric power using fuel gas G via 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 obtained by recovering the exhaust heat of the power generation section Ha, and an auxiliary heat source unit 2 for burning using a fuel gas G via a microcomputer meter M.

The microcomputer meter M leaks the fuel gas non-consumption state in which the state in which the flow rate of the fuel gas G becomes equal to or less than the set determination amount (for example, 1.0 L / h) continues over the set duration (for example, 60 minutes) If it does not occur during the judgment period (for example, 30 days), it has a function to alarm or shut off the supply of the fuel gas G, the details of which are well known, and therefore the detailed description in this embodiment. Omit.
Incidentally, 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 device 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 provided with a fuel electrode 4n and an oxygen electrode 4s, and a flowing portion 4d through which cooling water flows between the fuel electrode 4n and the oxygen electrode 4s. Is provided.

Cooling water circulating through the cooling water circulation passage 5A that collects the heat generated by the fuel cell 4 with cooling water, hot water circulating passage 5B circulating the hot water of the hot water storage tank 1, and cooling water circulating through the cooling water circulation passage 5A A heat exchange unit 5C is provided to exchange heat with the hot and cold water.
A cooling water circulation pump Pa and a cooling water storage tank Q are provided in the cooling water circulation path 5A, and a hot water circulation pump Pb is provided in the hot water circulation path 5B.

  Then, by heating the hot water flowing through the hot water circulation path 5B with the cooling water circulating through the cooling water circulation path 5A, high temperature hot water is stored in the hot water storage tank 1, and hot water is stored using the stored hot water. And when it is comprised so that a pursuit of bath water may be performed and the calorie | heat amount stored in the hot water storage tank 1 runs short, it is comprised so that the auxiliary | assistant heat source machine 2 may be operated, The detail is mentioned later.

An inverter 6 for grid connection is provided on the power output side of the fuel cell 4, and 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 source 7. It is configured to be.
The commercial power supply 7 is, for example, a single-phase three-wire 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.
Inverter 6 is electrically connected to received power supply line 8 via generated power supply line 10, and the generated power from fuel cell 4 is supplied to electric power load 9 via inverter 6 and generated power supply line 10. Is configured as.

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 measurement unit 11 is also configured to detect whether or not so-called reverse power flow occurs in which current flows to the commercial power supply 7 side in the received power supply line 8.
Then, the power supplied from the fuel cell 4 to the received power supply line 8 is controlled by the inverter 6 so that no reverse power flow occurs, and the surplus power of the power generated by the fuel cell 4 is converted into heat by the surplus power. It is configured to be supplied to the electric heater 12 to be changed and collected.

The electric heater 12 is composed of a plurality of electric heater parts, and the electric heater 12 is provided to heat the hot water flowing through the above-described hot water circulation path 5B.
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 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 for controlling the operation of the reforming treatment apparatus 3 and the fuel cell 4. The heat source unit Hb is provided with a heat source control unit Cb for controlling the operation of the heat source unit Hb. The operation control unit C that controls the operation of the energy supply unit H is configured of a power generation control unit Ca and a heat source control unit Cb.
The control unit for power generation Ca and the control unit for heat source Cb are configured to be able to communicate various types of information, and to the control unit for power generation Ca and the control unit for heat source Cb, an operation start instruction, an operation stop instruction, etc. A remote control R is provided to command various information.

(Reforming equipment)
Next, a description will be given of the reforming treatment apparatus 3. As shown in FIG. 2, a fuel supply passage 16 for pressure-feeding the fuel gas G passed through the microcomputer meter M by the fuel pump 15 is provided. A desulfurizer 17 is provided which desulfurizes the fuel gas G supplied.
A steam generator 18 is provided to vaporize 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 texture machine 19 is provided.

  In addition, the total amount of the metamorphic gas subjected to the metamorphic processing by the metamorphic device 20 and the metamorphic device 20 that transform the carbon monoxide contained in the reformed gas reformed by the reformer 19 into carbon dioxide is supplied. The gas cooler 21 cools to condense the water vapor in the supplied metamorphic gas, and the vapor-water separator 22 separates the condensed water in which the vapor in the metamorphic gas is condensed by the cooling by the gas cooler 21. Is provided.

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

  Incidentally, during normal operation, the gas cooler 21 and the air-water separator 22 separate the water vapor in the metamorphic gas transformed by the metamorphic device 20 as described above, and will be described later. In the gas purge process, the water vapor remaining in the reformer 3 is separated.

  As described above, the reforming processing apparatus 3 steam-reforms the fuel gas G supplied through the fuel supply passage 16 in the reformer 19 to generate a hydrogen-containing gas, and generates the hydrogen-containing gas 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 concentration of carbon monoxide contained in the hydrogen-containing gas, thereby generating a hydrogen-containing gas having a low carbon monoxide concentration. The fuel cell 4 is configured to be supplied with the fuel cell supply passage 24 as a fuel gas.

(Details of the reformer)
Hereinafter, each part of the reforming treatment apparatus 3 will be described.
As apparent from the above description, the fuel gas G supplied through the fuel supply passage 16 is desulfurizer 17, reformer 19, shift converter 20, gas cooler 21, gas-water separator 22, carbon monoxide selective oxidation Since the desulfurizer 17, the reformer 19, the shift converter 20, the gas cooler 21, the gas-water separator 22, and the carbon monoxide selective oxidizer 23 flow in the order listed, the desulfurizer 17, the reformer 19, the It is connected by.

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

  A steam passage 28 for introducing the steam from the steam generator 18 is connected to a gas processing passage 27 connecting the desulfurizer 17 and the reformer 19 so that the fuel gas G and the steam generated by the desulfurizer 17 are desulfurized. The steam generated by 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 generated gas outlet valve V2, and the off gas passage 26 is provided with a reformer burner. A battery outlet valve V6 for interrupting the supply of off gas to 19a is provided, and a combustion air valve V10 for interrupting the supply of combustion air to the reformer burner 19a is provided in the combustion air passage 29. .

  Although not shown, a fuel supply passage for supplying the fuel gas G via the microcomputer meter M to the reformer burner 19a at the time of start-up, etc. is provided, and the fuel supply passage is intermittently supplied with fuel. The on-off valve is equipped.

The cell bypass passage 30 is branched from a point upstream of the generated gas outlet valve V 2 in the fuel cell supply passage 24, and the cell bypass passage 30 is located downstream of the cell outlet valve V 6 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 flow passage.

  Heat exchange is possible between the combustion gas flow passage portion 18a through which the combustion gas discharged from the reformer burner 19a flows and the evaporation portion 18b to which water is supplied in the reforming water supply passage 31 in the steam generator 18 The combustion gas discharged from the reformer burner 19a of the reformer 19 is used as a heat source to vaporize water to generate water vapor.

The reforming water supply path 31 is provided with a reforming water valve V3 for interrupting the supply of water.
Further, the water vapor generator 18 is provided with a reforming water discharge passage 32 for discharging the water inside, and the reforming water discharge passage 32 is provided with a reforming water discharge valve V4 for opening and closing the flow passage. ing.

The desulfurization recycle path 25 is provided in such a form as to connect the gas phase portion of the steam / water 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 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 of the portion where the temperature is highest in the reforming reaction region inside, and the fuel cell supply passage 24 has a flow passage A pressure sensor 35 is provided which detects the internal pressure as the internal pressure of the reforming treatment apparatus 3.

  Incidentally, the fuel supply passage 16, the gas processing passage 27, the steam passage 28, the reforming water supply passage 31, the reforming water discharge passage 32, the desulfurizer 17, the steam generation device 18, the reformer 19, the transformer 20, A gas processing path formed by the carbon monoxide selective oxidizer 23 and the fuel cell supply passage 24 etc., that is, from the desulfurizer 17 and the steam generator 18 to the carbon monoxide selective oxidation via the reformer 19 and the shift converter 20 In the gas processing path leading to the vessel 23, since the reformer 19 has the highest temperature, the reformer temperature sensor 34 detects the temperature of the highest temperature portion in the gas processing path.

  The detection information of the reformer temperature sensor 34 and the pressure sensor 35 is input to the control unit for power generation Ca, and the control unit for power generation Ca performs start-up operation, steady-state operation (normal operation), stop operation, etc. In the above, the opening and closing control of each of the valves V1 to V4 and V6 to V10 is performed.

(Stop storage operation of the power generation unit)
Next, the stop and storage operation when the reforming processing device 3 and the fuel cell 4 are stopped and stored will be described.
When the control unit for power generation Ca stops the operation of the reforming treatment device 3 and the fuel cell 4 and performs the stop storage operation, the water vapor generator is stopped in a state where the supply of the fuel gas G by the fuel supply passage 16 is stopped. The steam supply process for supplying the steam to the inside of the reforming treatment apparatus 3 by continuing the production of the steam by 18 and discharging the gas in the apparatus inside the reforming treatment apparatus 3 (hereinafter referred to as a steam purge process) Then, the water supply to the steam generator 18 was stopped, the water was discharged from the inside of the steam generator 18, and the microcomputer meter M was A filling process (hereinafter referred to as a gas purge process) is performed to fill and seal the fuel gas G as a purge gas.

  Furthermore, after the gas purge process, the power generation control unit Ca supplements the fuel gas G via the microcomputer meter M to the inside of the reforming apparatus 3 so as to maintain the internal pressure of the reforming apparatus 3 at the set pressure. It is configured to perform a pressure holding process.

  At the end of the steam purge process, the temperature lowering process for lowering the temperature of the reforming treatment apparatus 3 is performed, and at the end of the gas purge process, the 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 stop storage operation by stopping the operation of the reforming processing device 3 and the fuel cell 4 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, in the control unit for power generation Ca, each of the first set time, the second set time, the set temperature Ts, the first set pressure Ps1 as the set appropriate pressure, and the second set pressure Ps2 as the lower limit filling pressure are provided. It is stored, the details of which will be described later.

  Incidentally, during steady operation (in normal operation) of the reforming treatment device 3 and the fuel cell 4, the fuel valve V1, the generated gas outlet valve V2, the reforming water valve V3, the battery outlet valve V6, the desulfurization recycle valve V8, selective oxidation The air valve V9 for combustion and the air valve V10 for combustion are opened, and the reforming water discharge valve V4 and the battery bypass valve V7 are closed (see FIG. 4).

That is, during steady operation (during 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 produce steam, which is produced as such The steam thus generated flows into the fuel gas G desulfurized by the desulfurizer 17. The reformer 19, the shift converter 20, and the carbon monoxide selective oxidizer 23 generate a hydrogen-containing gas having a low carbon monoxide concentration. The generated hydrogen-containing gas is supplied to the fuel cell 4.
Then, the off gas and combustion air discharged from the fuel cell 4 are supplied to the reformer burner 19a, the combustion of the off gas heats the reforming catalyst, and the hydrogen-containing gas that has flowed out of the shift converter 20. The reforming processing apparatus 3 is operated in such a form that a part of the fuel is supplied to the desulfurizer 17 for desulfurization.

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

After the water vapor purge processing start operation is performed, when the first set time has elapsed (# 2), a temperature decrease processing start operation for closing the battery bypass valve V7 is performed (# 3).
After the temperature decrease processing start operation, when the detected temperature T of the reformer temperature sensor 34 becomes lower than or equal to the set temperature Ts (# 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, and start gas purge process (# 5).

  When the second set time has elapsed (# 6), the reforming water discharge valve V4 is closed, and the water discharge end operation of ending the discharge of water from the steam generator 18 is performed (# 7), and then the pressure sensor 35 When the detected pressure P is higher than or equal to the first set pressure Ps1 (# 8), the fuel valve V1 is closed to perform the sealing process, and the gas purge process is finished (# 9).

  From then on, pressure holding processing will be performed. That is, when the pressure P detected by the pressure sensor 35 becomes less than or equal to the second set pressure Ps2 lower than the first set pressure Ps1 (# 10), the fuel valve V1 is opened (# 11) and becomes greater than or equal to the first set pressure Ps1 # 12) The fuel valve V1 will be closed (# 13), and then the processing from # 10 will be repeated, and if termination of stop storage is instructed (# 14), stop storage processing will be performed. It will end.

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

(Supplementary explanation of stop storage operation of the power generation unit)
In the water vapor purge process (water vapor supply process) in the stop storage operation for stopping and storing the reforming treatment apparatus 3 and the fuel cell 4, supply of the fuel gas G to the desulfurizer 17 and hydrogen gas for the desulfurization process, and The supply of air for selective oxidation to the carbon monoxide selective oxidizer 23 is stopped to stop the generation of the hydrogen-containing gas, but the supply of water to the steam generator 18 is continued, so the generation of steam is continued. Be done.
As described above, since the generation of water vapor is continued, the in-apparatus gas remaining in the gas processing path by the generated water vapor is supplied to the reformer burner 19a through the battery bypass passage 30.

  Then, since the supply of combustion air to the reformer burner 19a is continued, the combustible gas such as the fuel gas G and hydrogen gas in the gas in the apparatus is burned by the reformer burner 19a, and the combustion is performed. After the gas flows through the combustion gas flow passage portion 18a of the steam generator 18 to contribute to the steam generation, it is discharged, and the reformer 3 is treated by such a steam purge process (steam supply process). The inside of will be replaced by water vapor.

  By the way, all or almost all of the in-apparatus gas remaining in the gas processing path at the time when the steam purge processing start operation is performed is supplied to the reformer burner 19a to burnt the flammable gas. Since it is desirable, the first set time is set to be longer than the time required for supplying the entire device internal gas or substantially the entire amount to the reformer burner 19a at the time of the steam purge processing start operation.

After the first set time has elapsed, the temperature lowering process is performed in a state where the supply of the in-apparatus gas to the reformer burner 19a is stopped, and the water supply to the steam generator 18 is continued in the temperature lowering process. Since the heat is stored in the reforming device 3 and the water vaporizes and the steam fills the inside of the reforming device 3, the inside of the reforming device 3 becomes negative pressure and the outside air is reformed. Intrusion inside the processing device 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 of water vaporization, so Cooling of the processing device 3 is promoted.

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

That is, when the fuel gas G is supplied to a place where the amount of water vapor is insufficient for reforming reaction at high temperature, the fuel gas G is thermally decomposed to precipitate carbon, and the reforming catalyst and the like are As the supply of the fuel gas G as a purge gas is reduced to a temperature at which the internal temperature of the reforming treatment apparatus 3 can prevent the deposition of carbon due to thermal decomposition. There is a need to do.
Moreover, if the temperature drops too much, there is a risk that the residual steam inside the reforming treatment device 3 condenses and adheres to each catalyst, so the supply of the fuel gas G as a purge gas is performed inside the reforming treatment device 3 The temperature needs to be maintained at a temperature that can prevent the condensation of water vapor.

  Therefore, the set temperature Ts is set to a temperature that can prevent deposition of carbon due to thermal decomposition of the fuel gas G and prevent condensation of water vapor. For example, when using 13A city gas as the fuel gas G, setting is performed The temperature Ts is preferably set in the range of 150 to 450 ° C., and more preferably set in the range of 250 to 350 ° C.

In the gas purge process, since the water remaining in the steam generator 18 and the reforming water discharge path 32 is discharged, almost no steam is present in the reformer 19, so the fuel gas G is supplied. Also, the reforming reaction does not proceed, hydrogen is not generated, and the pressure inside the reforming treatment apparatus 3 can be prevented from rising.
Further, in the gas purge process, in parallel with the discharge of water remaining in the steam generator 18 and the reforming water discharge path 32, the fuel gas G is changed as a purge gas in the state where there is no gas outlet. It will be supplied to the inside of the quality processing device 3.

  Incidentally, most of the water vapor remaining inside the reforming device 3 before the fuel gas G is supplied as a purge gas is condensed by the gas cooler 21 as the gas purge is performed. Since the condensed water is separated by the gas-water separator 22 and discharged to the outside, even if the operation is stopped and the temperature inside the reforming treatment apparatus 3 is reduced, the water vapor can be used as each catalyst. It is possible to prevent problems such as condensation on the top.

  In addition, since the fuel gas G is injected when the internal temperature of the reforming processing device 3 is lowered by the pressure holding processing and the detection pressure P of the pressure sensor 35 becomes equal to or lower than the second set pressure Ps2, the reforming processing device Since the concentration of water inside 3 is further lowered, it is possible to more reliably prevent the problem that water vapor condenses on each catalyst.

  By the way, in the state where the inside of the reforming apparatus 3 is purged with the purge gas, it is necessary to prevent the outside air from invading the inside of the reforming apparatus 3, so the first set pressure Ps1 and the second setting Ps1 are set. The pressure Ps2 is set to a positive pressure and equal to or less than the device design pressure.

  In the start-up operation for starting the reforming processing device 3 which has been stopped, first, the fuel gas G is supplied to the reformer burner 19a, and the combustion start processing 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 prevent condensation of steam, the steam from the steam generator 18 is supplied to the reforming device 3. The water vapor replacement process is performed to replace the fuel gas G filled inside with water vapor, and thereafter, when the temperature of the reformer 19 rises to the reforming process start temperature, the fuel supply process for supplying the fuel gas G is started However, since the details are well known, the detailed description will be omitted in the present embodiment.

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

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

A multifunctional circulation path 54 in which the multifunctional circulation pump 40 is disposed is provided in a state of passing through the auxiliary heat source machine 2, the heating heat exchanger 43, the bath follow-up 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 follow-up heat exchanger 44 are disposed in parallel to the multi-function circulation path 54, and the heating solenoid valve 46 is a flow of hot and cold water passing through the heating heat exchanger 43. And a bath memorizing solenoid valve 47 is disposed in the multifunctional circulation path 54 in a manner to interrupt the flow of hot and cold water passing through the bath memorial heat exchanger 44.

A combined flow passage 55 is provided to connect the downstream side portion of the auxiliary heat source unit 2 in the multi-functional circulation passage 54 to the hot water extraction passage 51, and a tank proportional valve 49 is provided in the combined flow passage 55.
The heating circuit 56 is provided via the heating heat exchanger 43, and a heating circulation pump 41 is provided in the heating circuit 56.
A bath circulation path 57 is provided in a state of passing through the bath reserving heat exchanger 44, and a bath reserving circulation pump 42 is provided in the bath circulation path 57.

  Then, the heat source unit Hb mixes the hot water from the hot water extraction path 51 and the hot water from the first water supply path 53a and supplies the heat medium to the heating terminal through the hot water supply operation supplied from the hot water supply path 58 and the heating circulation path 56. A heating operation and a bath follow-up operation of heating while circulating bath water through the bath circulation path 57 are configured to be performed.

The hot water supply operation, the heating operation, and the bath remembrance operation are performed using the hot and cold water of the hot water storage tank 1, but when the hot water storage heat amount of the hot water storage tank 1 is insufficient, the auxiliary heat source machine 2 is operated to burn Are configured to
For example, when the hot water storage heat amount of the hot water storage tank 1 is large when the hot water supply operation is performed, the hot water of the hot water storage tank 1 is supplied to the hot water supply mixing valve 45 through the hot water discharge path 51. In this case, the hot and cold water from the second water supply passage 53 b is supplied to the hot water storage tank 1 through the hot and cold water supply passage 52 while passing through the heat storage switching valve 50.

  When the hot water storage heat amount of the hot water storage tank 1 is small when the hot water supply operation is performed, the hot water from the second water supply passage 53b is supplied to the multifunctional circulation passage 54 through the hot water supply passage 52 via the heat storage switching valve 50, After heating by the auxiliary heat source unit 2, it is made to flow to the hot and cold water takeoff passage 51 through the combined flow passage 55.

  When heating operation or bath remembrance operation is performed, when the amount of heat storage of the hot water storage tank 1 is large, the hot water of the hot water storage tank 1 is passed through the branch passage 51a while operating the multifunctional circulation pump 40. , And the heat exchanger 43 for heating and the heat exchanger 44 for bath remembrance are made to flow, and then flow in the form of being returned to the hot water storage tank 1 through the hot water supply path 52.

  When heating operation or bath remembrance operation is performed, when the amount of heat stored in the hot water storage tank 1 is small, the multi-function circulating pump 40 is operated with the three-way valve 48 switched to close the branch passage 51a. The hot and cold water in the circulation path 54 is circulated, and the circulating hot and cold water is heated by the auxiliary heat source unit 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 have elapsed. A leak judgment avoidance process and a warning process for displaying on the remote control R a message prompting to refrain from consumption of the fuel gas G until the setting cancellation condition is satisfied are configured as leakage judgment avoidance stop process and a warning process. There is.

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

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

  That is, in the state where supply of fuel gas G is stopped, steam purge processing (steam supply processing) of supplying steam inside the reforming processing device 3 to discharge the gas in the device, and the state where supply of steam is stopped Then, the gas purge process (filling process) of filling and sealing the fuel gas G through the microcomputer meter M inside the reforming treatment apparatus 3 is sequentially performed, and thereafter, the filling pressure of the fuel gas G is set as the lower limit filling pressure When the pressure drops to the second set pressure Ps2, the high pressure holding process is performed to supplement the fuel gas G passed through the microcomputer meter M to the inside of the reforming processing apparatus 3 until the set pressure Ps3 for high pressure is reached.

In addition, the non-supply continuation time, which is the continuation time of the state where 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 the setting continuation time (for example, 60 minutes). It is set as the conditions which reach the corresponding predetermined time (for example, 60 minutes).
In the present embodiment, as shown in FIG. 1, a power generation side flow meter 59 a and a heat source side flow meter 59 b 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 example, it is configured to determine whether or not it has reached 60 minutes.

  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, but for the power generation unit Ha, for example, depending on whether or not the fuel valve V1 is operated open. Since it can be determined whether the fuel gas G has been supplied, and whether the fuel gas G has been supplied can be determined based on whether or not the auxiliary heat source unit 2 has operated for the heat source Hb. Whether the time during which the fuel gas G is not supplied to each of the power generation unit Ha and the heat source Hb reaches a predetermined time (for example, 60 minutes) without installing the power generation side flow meter 59a and the heat source side flow meter 59b It may be determined whether or not.

  The warning process is a continuation time of the state where the fuel gas G is not supplied to the energy supply unit H even if the set process scheduled time (for example, 12 hours) elapses while the leakage determination avoidance stop process is being executed. When the state where the non-supply continuation time does not exceed the predetermined time (for example, 60 minutes) corresponding to the setting continuation time (for example, 60 minutes) does not occur, a warning is given to stop the consumption of the fuel gas G.

(Details of leak judgment 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), and if it has not been stopped, 26 days equivalent to 4 days before the leak judgment period of the microcomputer meter M (for example, 30 days) Is judged (# 21).

  When it is determined in # 21 that 26 days have elapsed, the activation prohibition to prohibit the activation of the power generation unit Ha is set (# 22), and then the operation of the reforming treatment device 3 and the fuel cell 4 is performed. The operation stop process (water vapor purge process, gas purge process, fuel consumption process) to be stopped is executed (# 23), and then the high pressure holding pressure process is executed (# 24).

As described above, when the detected pressure P of the pressure sensor 35 becomes equal to or lower than the second set pressure Ps2 lower than the first set pressure Ps1, the high-pressure storage pressure processing opens the fuel valve V1 and makes the pressure higher than the first set pressure Ps1. When the high-pressure set pressure Ps3 or more is reached, closing the fuel valve V1 is repeated, the details of which will be described later.
Incidentally, when it is determined that the power generation unit Ha has been stopped at # 20, there is no need to execute the operation stop process (# 23), so that the process proceeds to the high pressure holding process of # 24. Become.

  Next, the non-supply continuation time which is the continuation time of the state where 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 a predetermined time corresponding to the setting continuation time (for example, 60 minutes) It is determined whether (for example, 60 minutes) has passed (# 25), and if it is determined that the non-supply continuation time has passed a predetermined time (for example, 60 minutes), In order to allow the start, the start prohibition is released (# 26).

  If it is determined in # 25 that the non-supply continuation time has not exceeded the predetermined time, it is determined whether the scheduled processing time (for example, 12 hours) has elapsed (# 27), and the processing schedule is determined. If the time has elapsed, a warning process is executed to display a message prompting the user to refrain from consuming the fuel gas G on the remote control R (# 28).

  Although the flowchart of FIG. 5 is described on the premise that the power generation unit Ha is in operation, when considering the case where the power generation unit Ha is stopped when 26 days have passed, After it is determined that the operation has been stopped in # 20, it is determined whether or not the 26th day has elapsed, and when the 26th day has elapsed, the process of setting the start prohibition to prohibit the start of the power generation unit Ha is performed It will be added.

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

Next, it is determined whether the detected pressure P of the pressure sensor 35 is higher than the first set pressure Ps1 for the high pressure setting pressure Ps3 (# 33), and the detected pressure P of the pressure sensor 35 is the high pressure setting pressure If Ps3 or more, the fuel valve V1 is closed to complete the filling of the fuel gas G (# 34).
When 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, the steam supply process and the filling process are sequentially performed as the leakage determination avoidance stop process, and thereafter, when the filling pressure of the fuel gas G decreases to the second set pressure Ps2 or lower as the lower limit filling pressure, A high pressure holding pressure process is performed in which the fuel gas G is replenished to the high pressure setting pressure Ps3 which is higher than the first setting pressure Ps1 as the setting appropriate pressure.

  As described above, in the leakage judgment avoidance stop process, the high pressure holding pressure process is executed. Therefore, after the fuel gas G is replenished to the high pressure setting pressure Ps3, the filling pressure of the fuel gas G is lower than the lower limit filling. After the fuel gas G is replenished to the first set pressure Ps1 as the set appropriate pressure, an interval time until the second set pressure Ps2 as the pressure decreases (see FIG. 8), the filling pressure of the fuel gas G becomes lower limit filling It becomes longer than the interval time (refer FIG. 7) until it reduces to 2nd setting pressure Ps2 as a pressure.

  Incidentally, in FIGS. 7 and 8, the time interval indicated by T is one hour, and in FIG. 7, the supply amount at the time of supplementing the fuel gas G to the first set pressure Ps1 is the fuel amount at normal times. The gas supply amount is described, and in FIG. 8, the supply amount at the time of supplementing the fuel gas G to the high-pressure set 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 decreases to the second set pressure Ps2 as the lower limit filling 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, an 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 at the beginning of starting the high pressure holding treatment.

  Therefore, 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 is from the beginning of the high pressure pressure holding process. Since it tends to be longer than one hour, a state in which the interval time is longer than the set duration time (for example, 60 minutes) may appear even if a long time does not elapse from the stopping time of the power generation unit Ha. it can.

  Moreover, while detecting the pressure of the fuel gas G with which the reforming processing apparatus 3 is filled with the pressure sensor 35, based on the detection information of the pressure sensor 35, pressure holding processing in stop storage processing, and leakage judgment avoidance Because the high pressure holding process is executed in the stop process, the pressure holding process and the high pressure holding process are properly performed while accurately grasping the pressure of the fuel gas G filled in the reforming treatment apparatus 3. Can be done.

  Furthermore, in the present embodiment, 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 while the leakage determination avoidance stop process is being executed. When the state where the non-supply continuation time which is the continuation time does not occur exceeds the setting continuation time (for example, 60 minutes), a warning process is performed to warn the user to stop the consumption of the fuel gas G.

  Therefore, by performing the warning process, the user refrains from consuming the fuel gas G, thereby setting the non-supply duration which is the duration of the state in which the fuel gas G is not supplied to the energy supply unit H. A state in which the time for which the fuel gas G is not supplied to the energy supply unit H is more than the set continuation time can be easily realized since the state exceeding the duration (for example, 60 minutes) can be appropriately manifested It becomes.

  By the way, in general, the fuel gas G from the microcomputer meter M is also supplied to a general gas appliance such as a gas stove, but in this case, the use of the general gas appliance is also carried out by the above-mentioned warning processing. It will be reserved.

Second Embodiment
Next, although a second embodiment will be described, this second embodiment shows another embodiment of the leakage determination avoidance process executed by the power generation control unit Ca, and the other configuration is the first embodiment. Therefore, only the parts different from the first embodiment will be described, and the detailed description of the same configuration as the first embodiment will be omitted.

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

That is, the fuel gas G is charged into the reforming processing apparatus 3 until the pressure P detected by the pressure sensor 35 becomes higher than or equal to the high pressure setting pressure Ps3 higher than the first setting pressure Ps1, and then the consumption of the fuel gas G is stopped. It is configured to perform alert processing to alert you.
By the way, the warning process is a process of displaying on the remote control R a message prompting to refrain from the consumption of the fuel gas G.

(Details of leak judgment avoidance process)
Next, a leakage determination avoidance process executed by the power generation control unit Ca in the second embodiment will be described based on the flowchart of FIG. The processes of # 60 to # 67 in the flowchart of FIG. 9 are processes corresponding to # 20 to # 27 in the flowchart of FIG. 6.

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

When it is determined in # 61 that 26 days have passed, the activation prohibition to prohibit the activation of the power generation unit Ha is set (# 62), and then the operation of the reforming treatment device 3 and the fuel cell 4 is performed. The operation stop process (water vapor purge process, gas purge process, fuel consumption process) to be stopped is executed (# 63), and then the high-pressure holding process is executed (# 64).
By the way, if it is determined at # 60 that the power generation unit Ha has been stopped, there is no need to execute the operation stop process (# 63), so that the process proceeds to # 64 high pressure holding process. Become.

  Next, the non-supply continuation time which is the continuation time of the state where 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 a predetermined time corresponding to the setting continuation time (for example, 60 minutes) It is determined whether (for example, 60 minutes) has elapsed (# 65), and when it is determined that the non-supply continuation time has elapsed for a predetermined time (for example, 60 minutes), In order to allow the activation, the activation prohibition is released (# 66), and thereafter, the process proceeds to # 60.

If it is determined at # 65 that the non-supply continuation time has not exceeded the predetermined time (for example, 60 minutes), then whether or not the set processing scheduled time (for example, 12 hours) has elapsed Is determined (# 67).
When it is determined that the set processing scheduled time has elapsed, the high pressure storage pressure processing, that is, the fuel gas in the reforming device 3 until the detection 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 of displaying on the remote control R a message prompting to refrain from consumption of the fuel gas G is executed (# 71).

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

  Although the flowchart of FIG. 9 is described on the premise that the power generation unit Ha is in operation, when considering the case where the power generation unit Ha is stopped when 26 days have passed, After it is determined that the vehicle has been stopped in # 60, it is determined whether or not the 26th day has elapsed, and when the 26th day has elapsed, the process of setting the start prohibition to prohibit the start of the power generation unit Ha is performed It 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 as in the first embodiment, and thereafter, When the filling pressure of the fuel gas G falls below the second set pressure Ps2 as the lower limit filling pressure, the high-pressure holding pressure process of replenishing the fuel gas G to the high-pressure set pressure Ps3 higher than the first set pressure Ps1 is executed. As a result, even if a long time does not elapse from the stopping time of the power generation unit Ha, the interval time from the initial stage of high-pressure holding processing becomes longer than the setting duration (for example, 60 minutes). It can be done.

  Moreover, while detecting the pressure of the fuel gas G with which the reforming processing apparatus 3 is filled with the pressure sensor 35, based on the detection information of the pressure sensor 35, pressure holding processing in stop storage processing, and leakage judgment avoidance Because the high pressure holding process is executed in the stop process, the pressure holding process and the high pressure holding process are properly performed while accurately grasping the pressure of the fuel gas G filled in the reforming treatment apparatus 3. Can be done.

  Moreover, during the execution of the leakage determination avoidance stop process, 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 the state where the duration does not exceed the setting duration (for example, 60 minutes) does not occur, the warning process is performed to warn the consumption of the fuel gas G, so the fuel gas G is sent to the energy supply unit H It becomes easy to make the state where the non-supplying time is longer than the set continuation time appear.

  Furthermore, according to the present embodiment, the high-pressure pressure holding process is performed before the warning process is performed, so that the user consumes the fuel gas G by performing the warning process. 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 the fuel gas G is being stored. It is possible to properly bring out the state in which the time duration is not less than the set duration time.

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

Third Embodiment
Next, a third embodiment will be described. The third embodiment shows another embodiment of the energy supply system, and the other configuration is the same as that of the first embodiment. Only the portions different from the embodiment will be described, and the detailed description of the same configuration as the first embodiment will be omitted.

  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 for cooling the cooling water is provided in the cooling water circulation passage 5A for recovering the heat generated by the fuel cell 4 with the cooling water. The radiator F is provided downstream of the fuel cell 4 and upstream of the cooling water storage tank Q.
In addition, in the cooling water circulation passage 5A, 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 passage 5A, which is downstream of the fuel cell 4 It is provided on the upstream side of the radiator F.

  The radiator F is configured to perform an operation of cooling the cooling water by discharging the heat held by the cooling water flowing through the cooling water circulation passage 5A to the outside during the operation of the fuel cell 4. In addition, 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 alternative embodiments will be 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 heat source unit Hb. Although the case where the control unit Cb for generating heat source is configured is illustrated, the control unit for power generation Ca and the control unit for heat source Cb are combined as one control unit, and the operation control unit C is configured as one control unit. You may implement in a form.

(2) In the first and second embodiments, the power generation unit Ha and the heat source unit Hb are configured as separate units. However, the power generation unit Ha and the heat source unit Hb are configured as one unit. You may implement in the form which

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

(4) In the first to third embodiments, the pressure holding process and the high pressure holding process are performed based on the detection information of the pressure sensor 35. For example, as shown in FIGS. Thus, each time the temperature T detected by the reformer temperature sensor 34 decreases by the set temperature, the fuel valve V1 is opened for the set time, and the fuel gas G is filled by the set amount, etc. The specific configuration of the treatment and the high pressure holding treatment can be variously changed.

Incidentally, the above-described set temperature Ts is, for example, 30 ° C. in the pressure holding process, and is 50 ° C. in the high pressure pressure holding process.
When the fuel gas G is charged based on the detected temperature T as described above, 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 equilibrates with the outside air temperature, the filling of the fuel gas G will be stopped.

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

(5) In the first to third embodiments, a solid polymer fuel cell was illustrated as the fuel cell 4 of the power generation unit Ha, but various types of fuel cells such as a solid oxide fuel cell may be used. A fuel cell can be equipped, and the reformer 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, water vapor is supplied to the inside of the reforming processing device 3 in a state where the supply of the fuel gas G is stopped, and the inside of the device is stopped. 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 at a set appropriate pressure inside the C are sequentially performed in a state where the steam supply is stopped, Then, although the case where a pressure holding process is performed was illustrated, depending on the structure of the reforming processing apparatus 3, when stopping the power generation unit Ha, the water vapor supply process is omitted, the filling process is performed, and then the pressure holding process is performed. You may implement in the form which performs pressure processing.

(7) In the first to third embodiments, the case where the filling process and the pressure holding process are performed 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, in the form of filling the fuel gas G into the reforming device 3 and the fuel electrode 4n of the fuel cell 4, that is, the fuel electrode 4n of the fuel cell 4 together with the reforming device 3 is also a fuel gas at once. It may be implemented to perform the filling process and the pressure holding process in the form of filling G.

(8) In the third embodiment, although the heat held by the cooling water for cooling the fuel cell 4 is released to the outside by the radiator F in the power generation unit Ha, the invention is not limited thereto, and the fuel cell 4 is cooled. You may provide the thermal storage tank which stores the hot water which collect | recovered the heat | fever which a cooling water holds.

  The configurations disclosed in the above embodiment (including the other embodiments, the same applies hereinafter) can be applied in combination with the configurations disclosed in the other embodiments as long as no contradiction arises. The embodiment disclosed in the present specification is an exemplification, and the embodiment of the present invention is not limited thereto, and can be appropriately modified without departing from the object of the present invention.

Reference Signs List 1 hot water storage tank 3 reforming processing device 4 power generation unit C operation control unit H energy supply unit Ha power generation unit Hb heat source unit M microcomputer meter

Claims (4)

If the fuel gas nonconsumption state in which the flow rate of the fuel gas becomes equal to or less than the set determination amount continues for the set duration time does not occur during the leak determination period, an alarm is activated or the fuel gas supply is shut off. An energy supply unit including a microcomputer meter, a power generation unit generating electric power using fuel gas via the microcomputer meter, and an operation control unit controlling an operation of the energy supply unit;
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
When stopping the power generation unit, a filling process is performed to fill the inside of the reforming processing apparatus with the fuel gas having passed through the microcomputer meter to a set appropriate pressure and seal the fuel gas, and thereafter, the filling pressure of the fuel gas When the pressure drops to the lower limit filling pressure, it is configured to perform stop storage processing for performing pressure holding processing for replenishing the fuel gas to the set appropriate pressure, and
The energy supply system is configured to execute a leakage determination avoidance stop process that stops the operation of the power generation unit until the setting cancellation condition is satisfied before the leakage determination period elapses.
The operation control unit executes the filling process as the leakage determination avoidance stop process, and thereafter, when the filling pressure of the fuel gas decreases to the lower limit filling pressure, the high pressure setting pressure is higher than the setting appropriate pressure. An energy supply system configured to perform a high pressure holding process to replenish 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 obtained by recovering exhaust heat of the power generation unit.   The non-supply continuation time which is the continuation time of the state where fuel gas is not supplied to the energy supply unit even if the set processing scheduled time has elapsed while the operation control unit is executing the leakage determination avoidance stop process 3. The high-pressure holding process and the warning process for giving a warning for stopping the consumption of the fuel gas are executed when no condition exceeding the setting continuation time occurs. Energy supply system. There is provided a pressure sensor for detecting the pressure of the fuel gas charged in the reforming device.
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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