JP7441151B2 - fuel cell system - Google Patents

Description

The present invention relates to a fuel cell system.

For example, a fuel cell system called ENE-FARM (registered trademark) is installed at a site and, after a trial run, is sometimes stored for a long period of time until actual operation begins. When a fuel cell system is stored, a plurality of auxiliary devices may be energized even if the fuel cell is not generating power. At this time, if the gas sensor that detects gas leakage is also energized, the gas sensor will gradually deteriorate. Therefore, if the gas sensor remains energized during storage of the fuel cell system, the life of the gas sensor will be shortened.

Therefore, in the fuel cell system described in Patent Document 1, even when a plurality of auxiliary machines are energized, when the gas valve (on-off valve) provided in the raw fuel gas supply pipe is closed, the Control is performed to stop energization of the gas sensor.

Further, in the fuel cell system described in Patent Document 1, when a gas valve is opened, control is performed such that only one gas sensor among the plurality of gas sensors is energized in response to the opening.

JP2018-49783A

However, in the fuel cell system described in Patent Document 1, when the gas valve is closed, the energization of the gas sensor is immediately stopped in response. For this reason, for example, it is possible to detect a leak of raw fuel gas that remains inside the raw fuel gas supply pipe after the gas valve is closed, or a leak of raw fuel gas that occurs due to maintenance work performed after the gas valve is closed. I can't. Therefore, there is room for improvement in order to be able to appropriately detect leakage of raw fuel gas after closing the gas valve while suppressing deterioration of the gas sensor due to energization.

Further, in the fuel cell system described in Patent Document 1, when the gas valve is opened, only one gas sensor among the plurality of gas sensors is energized in response. However, if it takes time to start up the gas sensor, leakage of raw fuel gas cannot be detected from when the gas valve is opened until when the gas sensor is started. Therefore, there is room for improvement in order to be able to appropriately detect leakage of raw fuel gas after opening the gas valve while suppressing deterioration of the gas sensor due to energization.

A first object of the present invention is to provide a fuel cell system that can appropriately detect leakage of raw fuel gas after closing a gas valve while suppressing deterioration of a gas sensor due to energization.

In order to achieve the first object of the present invention, a fuel cell system according to a first aspect of the present invention includes a power generation module that is connected to a raw fuel gas supply pipe that supplies raw fuel gas and has a fuel cell; a gas valve provided in the raw fuel gas supply pipe; a gas sensor that detects leakage of the raw fuel gas; and after the gas valve is closed, energization to the gas sensor is maintained and then the gas sensor is a control device that performs control to stop energization of the gas valve, and a remote controller or an operation board communicably connected to the control device, and the control device controls the operation of the gas valve within a certain period of time after the gas valve is closed. Further, control is performed to stop energizing the gas sensor when there is no operation of the remote controller or the operation board .

According to the first aspect of the present invention, leakage of raw fuel gas can be appropriately detected after the gas valve is closed while suppressing deterioration of the gas sensor due to energization.

1 is a block diagram schematically showing the overall configuration of a fuel cell system according to an embodiment of the present invention. 2 is a block diagram showing a connection configuration in which a relay is added to the control device, remote control, gas valve, gas sensor, and power supply board shown in FIG. 1. FIG. 2 is a flowchart showing the flow of control up to stopping power supply to the gas sensor shown in FIG. 1. FIG. 2 is a flowchart showing the flow of control up to the start of energization of the gas sensor shown in FIG. 1. FIG.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram schematically showing the overall configuration of a fuel cell system 10 according to an embodiment of the present invention. A fuel cell system 10 according to an embodiment of the present invention is, for example, a power generation system called ENE-FARM (registered trademark), and includes a fuel cell unit 12 and a remote controller 14.

Typically, fuel cell unit 12 is installed outside the user's building and remote controller 14 is installed inside the user's building. Hereinafter, the remote controller 14 will be abbreviated as remote controller 14.

The fuel cell unit 12 includes a raw fuel gas supply device 20, an oxidizing gas supply device 30, a reformed water supply device 40, a power generation module 50, an exhaust heat recovery device 60, and a hot water storage tank 70.

The raw fuel gas supply device 20 is a device that supplies raw fuel gas to the power generation module 50. The raw fuel gas is, for example, city gas or LP gas. The raw fuel gas supply device 20 includes a raw fuel gas supply pipe 21 , a gas valve 22 , a desulfurizer 23 , a pressure sensor 24 , a flow rate sensor 25 , and a raw fuel gas pump 26 .

The raw fuel gas supply pipe 21 is connected to the vaporizer 52 of the power generation module 50. The raw fuel gas supply pipe 21 is provided with a gas valve 22 , a desulfurizer 23 , a pressure sensor 24 , a flow rate sensor 25 , and a raw fuel gas pump 26 .

The gas valve 22 is, for example, a solenoid valve, and has a configuration that can take an open state in which the raw fuel gas supply pipe 21 is opened and a closed state in which the raw fuel gas supply pipe 21 is closed. The desulfurizer 23 removes sulfur contained in the raw fuel gas flowing through the raw fuel gas supply pipe 21 , and the pressure sensor 24 detects the pressure of the raw fuel gas inside the raw fuel gas supply pipe 21 . The flow rate sensor 25 detects the flow rate of the raw fuel gas flowing through the raw fuel gas supply pipe 21 , and the raw fuel gas pump 26 supplies the raw fuel gas to the vaporizer 52 through the raw fuel gas supply pipe 21 .

The oxidizing gas supply device 30 is a device that supplies oxidizing gas to the power generation module 50. The oxidant gas supply device 30 includes an oxidant gas supply pipe 31 , an air filter 32 , a flow rate sensor 33 , and a blower 34 .

The air filter 32 is provided at an oxidizing gas intake port 81 formed in a casing 80 of the fuel cell unit 12, which will be described later. The oxidizing gas supply pipe 31 connects the oxidizing gas intake port 81 and the fuel cell 54 of the power generation module 50, which will be described later. The oxidant gas supply pipe 31 is provided with a flow rate sensor 33 and a blower 34 .

The flow rate sensor 33 detects the flow rate of the oxidizing gas flowing through the oxidizing gas supply pipe 31 , and the blower 34 supplies the oxidizing gas to the fuel cell 54 through the oxidizing gas supply pipe 31 .

The reformed water supply device 40 is a device that supplies reformed water to the power generation module 50. The reformed water supply device 40 includes a reformed water supply pipe 41, a reformed water tank 42, an ion exchange resin 43, and a reformed water pump 44. The reformed water supply pipe 41 connects the reformed water tank 42 and a vaporizer 52 of a power generation module 50, which will be described later. The reformed water supply pipe 41 is provided with an ion exchange resin 43 and a reformed water pump 44 .

In the reformed water tank 42, condensed water condensed in a heat exchanger 63 of an exhaust heat recovery device 60, which will be described later, is stored as reformed water. The ion exchange resin 43 removes impurities from the reformed water flowing through the reformed water supply pipe 41 , and the reformed water pump 44 supplies the reformed water to the vaporizer 52 through the reformed water supply pipe 41 .

The power generation module 50 includes a module case 51, a vaporizer 52, a reformer 53, and a fuel cell 54 (fuel cell stack). The vaporizer 52, the reformer 53, and the fuel cell 54 are housed in a module case 51 made of a heat insulating material.

The vaporizer 52 is supplied with reformed water and raw fuel gas, heats the reformed water and raw fuel gas, evaporates the reformed water to generate water vapor, and preheats the raw fuel gas. The reformer 53 is supplied with steam and preheated raw fuel gas from the vaporizer 52, and reforms the raw fuel gas by a steam reforming reaction to generate fuel gas containing hydrogen.

The fuel cell 54 receives fuel gas from the reformer 53 and oxidizing gas from the oxidizing gas supply device 30, and generates electricity through an electrochemical reaction between the fuel gas and the oxidizing gas. Further, the fuel cell 54 generates heat as it generates electricity.

The exhaust heat recovery device 60 is a device that recovers heat generated by the power generation of the fuel cell 54, and includes an outgoing pipe 61, a returning pipe 62, a heat exchanger 63, and a circulation pump 64. The heat exchanger 63 and the hot water storage tank 70 are connected by an outgoing pipe 61 and a returning pipe 62, and the outgoing pipe 61 is provided with a circulation pump 64.

The water supplied to the hot water storage tank 70 is supplied to the heat exchanger 63 through the outgoing pipe 61, and in the heat exchanger 63, the water is heated by the exhaust gas discharged from the fuel cell 54 to generate hot water. This hot water is supplied to the hot water storage tank 70 through the return pipe 62. The hot water supplied to the hot water storage tank 70 is stored in the hot water storage tank 70, and the hot water stored in the hot water storage tank 70 is used for hot water supply. Exhaust gas supplied from the fuel cell 54 to the heat exchanger 63 is discharged to the outside of the casing 80.

The fuel cell unit 12 includes a housing 80 in addition to the above configuration. The raw fuel gas supply device 20 , oxidant gas supply device 30 , reformed water supply device 40 , power generation module 50 , exhaust heat recovery device 60 , and hot water storage tank 70 described above are housed in a housing 80 . The housing 80 is provided with a ventilation port 82, and this ventilation port 82 is provided with a ventilation filter 83.

The fuel cell unit 12 also includes a gas sensor 90, an outside temperature sensor 91, an operation board 92, a display panel 93, a power conditioner 94, a power supply board 95, and a control device 100. Gas sensor 90, outside temperature sensor 91, operation board 92, display panel 93, and power conditioner 94 are electrically connected to control device 100. Further, the remote controller 14 and the control device 100 are communicably connected to the heat source device 200.

The gas sensor 90 is provided inside the housing 80, for example. This gas sensor 90 detects leakage of raw fuel gas. That is, the gas sensor 90 is configured to output a gas detection signal when detecting raw fuel gas.

The outside temperature sensor 91 detects outside temperature and outputs a signal according to the outside temperature. The operation board 92 is communicably connected to the control device 100 by wire or wirelessly, and outputs an operation signal to the control device 100 according to an operation by an operator. The display panel 93 performs display according to the display signal output from the control device 100.

Power conditioner 94 is connected between the output terminal of fuel cell 54 and AC power line 112 from commercial power source 110 to load 111 . Hereinafter, the power conditioner 94 will be abbreviated as power conditioner 94. The power conditioner 94 converts the DC power from the fuel cell 54 into AC power and adds it to the AC power from the commercial power source 110 .

The power supply board 95 is connected to a DC power line 113 branched from the power conditioner 94 . This power supply board 95 is connected to a plurality of auxiliary machines and control devices such as the above-mentioned gas valve 22, pressure sensor 24, flow rate sensor 25, raw fuel gas pump 26, flow rate sensor 33, blower 34, reformed water pump 44, and circulation pump 64. Supply DC power to 100 etc.

The aforementioned gas valve 22, pressure sensor 24, flow rate sensor 25, raw fuel gas pump 26, flow rate sensor 33, blower 34, reformed water pump 44, and circulation pump 64 are electrically connected to the control device 100. The control device 100 controls the operation of the entire fuel cell system 10 by controlling a plurality of auxiliary devices such as the gas valve 22, the raw fuel gas pump 26, the blower 34, the reformed water pump 44, and the circulation pump 64.

FIG. 2 is a block diagram showing a connection configuration in which a relay 96 is added to the control device 100, remote control 14, gas valve 22, gas sensor 90, and power supply board 95 shown in FIG. The remote control 14 is communicably connected to the control device 100. A control device 100 and a gas valve 22 are connected to the power supply board 95 . Further, a gas sensor 90 is connected to the power supply board 95 via a relay 96. Gas valve 22 and relay 96 are electrically connected to control device 100.

The relay 96 can take a closed state in which DC power is supplied from the power supply board 95 to the gas sensor 90 and an open state in which the power supply from the power supply board 95 to the gas sensor 90 is stopped in response to a control signal from the control device 100. It is the composition. The gas sensor 90 is connected to a power supply board 95 via a relay 96, and by opening and closing the relay 96, DC power is supplied and stopped independently of other auxiliary devices.

Control device 100 is configured by a computer. This control device 100 has a processor 101 and a memory 102 as a hardware configuration. The processor 101 includes, for example, a CPU (Central Processing Unit). The memory 102 includes, for example, ROM (Read Only Memory), RAM (Random Access Memory), storage, and the like.

The ROM stores various programs and various data. The RAM temporarily stores programs or data as a work area. The storage is configured with an HDD (Hard Disk Drive) or an SSD (Solid State Drive), and stores various programs including an operating system and various data.

A program 103 for controlling the operation of the entire fuel cell system 10 is stored in the ROM or storage. The processor 101 reads the program 103 and executes the program 103 using the RAM as a work area. The overall configuration of the fuel cell system 10 is outlined above.

Incidentally, after the fuel cell system 10 having the above configuration is installed at a site and a trial run is performed, it may be stored for a long period of time until actual operation is started. When the fuel cell system 10 is stored, a plurality of auxiliary machines may be energized even if the fuel cell 54 is not generating power. At this time, if the gas sensor 90 that detects gas leakage is also energized, the gas sensor 90 will gradually deteriorate. Therefore, if the gas sensor 90 remains energized during storage of the fuel cell system 10, the life of the gas sensor 90 will be shortened.

Therefore, even when a plurality of auxiliary machines are energized, when the gas valve 22 (on-off valve) provided in the raw fuel gas supply pipe is closed, control is performed to stop the energization of the gas sensor 90 accordingly. It is possible that

However, when performing such control, when the gas valve 22 is closed, the energization of the gas sensor 90 is immediately stopped in response. For this reason, for example, leakage of raw fuel gas that remains inside the raw fuel gas supply pipe 21 etc. after the gas valve 22 is closed, or leakage of raw fuel gas that occurs due to maintenance work performed after the gas valve 22 is closed. cannot be detected. Therefore, it is desirable to be able to appropriately detect leakage of raw fuel gas after closing the gas valve 22 while suppressing deterioration of the gas sensor 90 due to energization.

Furthermore, if the gas sensor 90 remains de-energized when the gas valve 22 is opened, leakage of raw fuel gas cannot be detected after the gas valve 22 is opened. It is conceivable that the gas sensor 90 is controlled to be energized.

However, if it takes time to start up the gas sensor 90, leakage of the raw fuel gas cannot be detected from when the gas valve 22 is opened until when the gas sensor 90 is started. Therefore, it is desirable to be able to appropriately detect leakage of raw fuel gas after opening the gas valve 22 while suppressing deterioration of the gas sensor 90 due to energization.

Therefore, the control device 100 has the following functions. That is, the control device 100 has a function of performing control such that after the gas valve 22 is closed, energization to the gas sensor 90 is maintained, and then energization to the gas sensor 90 is stopped. Specifically, the control device 100 has a function to perform control to stop supplying electricity to the gas sensor 90 if the remote controller 14 or the operation board 92 is not operated within a certain period of time after the gas valve 22 is closed. has.

Further, the control device 100 has a function of performing control to start energizing the gas sensor 90 when the remote controller 14 or the operation board 92 is operated with the gas valve 22 closed. Each of the functions of the control device 100 described above is realized by the processor 101 executing the program 103.

Next, the operation and effects of the fuel cell system 10 according to the present embodiment will be explained.

First, the flow of control up to stopping power supply to the gas sensor 90 will be explained. FIG. 3 is a flowchart illustrating the flow of control up to stopping power supply to the gas sensor 90 shown in FIG. 1. This control until the power supply to the gas sensor 90 is stopped is performed when the fuel cell system 10 is installed at a site, a test run is performed, and then stored for a long period of time until actual operation is started. In the control until the power supply to the gas sensor 90 is stopped, the following steps S1 to S3 are executed.

In step S1, the control device 100 determines whether the gas valve 22 is in an open state based on the history of control signals output to the gas valve 22 or a status signal output according to the open/closed state of the gas valve 22. to decide.

If the fuel cell system 10 is not in a state where it will be stored for a long period of time and the gas valve 22 is still in the open state, the control device 100 determines that the gas valve 22 is in the open state (step S1: Yes), return. Then, the control device 100 repeatedly executes step S1 until it determines that the gas valve 22 is in the closed state.

When the fuel cell system 10 is stored for a long period of time and the gas valve 22 is closed while step S1 is repeatedly executed, the control device 100 causes the gas valve 22 to be closed in step S1. It is determined that it has become (step S1: No), and the process moves to step S2.

In step S2, the control device 100 operates the remote controller 14 or the operation board 92 within a certain period of time after the gas valve 22 is closed, based on the history of operation signals output from the remote controller 14 or the operation board 92. Determine whether or not there was. The certain period of time is arbitrarily set in advance, and is, for example, 60 minutes.

Even after the gas valve 22 is closed, when the operator operates the remote controller 14 or the operation board 92 to perform settings or maintenance of the fuel cell system 10, the control is performed from the remote controller 14 or the operation board 92. An operation signal is output to the device 100.

In this way, if the remote controller 14 or the operation board 92 is operated within a certain period of time after the gas valve 22 is closed, the control device 100 controls the operation of the remote controller 14 or the operation board 92 within the certain period of time. It is determined that there has been an operation (step S2: Yes), and the process returns. Then, the control device 100 repeatedly executes steps S1 to S2 until it determines that there is no operation of the remote controller 14 or the operation board 92 within a certain period of time. Thereby, the gas sensor 90 is maintained on (operating state).

On the other hand, if the settings, maintenance, etc. of the fuel cell system 10 are completed after the gas valve 22 is closed, and the remote control 14 or the operation board 92 is not operated within a certain period of time after the gas valve 22 is closed. , the control device 100 determines that there is no operation of the remote controller 14 or the operation board 92 within a certain period of time (step S2: No), and moves to step S3.

In step S3, the control device 100 performs control to stop the power supply to the gas sensor 90, and turns off the gas sensor 90. Specifically, the control device 100 outputs a control signal that is an opening command to the relay 96 to open the relay 96. When the relay 96 is in the open state, power supply from the power supply board 95 to the gas sensor 90 is stopped, and the gas sensor 90 is turned off (stopped).

In this way, the control device 100 determines whether or not the remote controller 14 or the operation board 92 has been operated within a certain period of time after the gas valve 22 is closed, and controls the remote control 14 or the operation board 92 within a certain period of time. If there is no operation of gas sensor 92, power supply to gas sensor 90 is stopped. That is, after the gas valve 22 is closed, the control device 100 does not immediately stop the power supply to the gas sensor 90, but maintains the power supply to the gas sensor 90 and then stops the power supply to the gas sensor 90. .

Therefore, for example, leakage of raw fuel gas remaining inside the raw fuel gas supply pipe 21 etc. after the gas valve 22 is closed, or leakage of raw fuel gas caused by maintenance work performed after the gas valve 22 is closed, can be prevented. Even if the gas sensor 90 is energized, the leakage of raw fuel gas can be appropriately detected by the gas sensor 90.

Further, after that, the power supply to the gas sensor 90 is stopped, and when the fuel cell system 10 is stored, the power supply to the gas sensor 90 is maintained in a stopped state, so that deterioration of the gas sensor 90 due to the power supply can be suppressed.

In this way, according to the fuel cell system 10 according to the present embodiment, deterioration of the gas sensor 90 due to energization can be suppressed.

In addition, in the control until the power supply to the gas sensor 90 described above is stopped, if the control device 100 determines that there is no operation of the remote control 14 or the operation board 92 within a certain period of time in the above-mentioned step S2 (step S2: No ) may operate as follows.

That is, the control device 100 determines whether or not the fuel cell 54 is in a power generation halt state based on the history of control signals output to a plurality of auxiliary machines or status signals output according to the operating states of a plurality of auxiliary machines. In addition to determining whether or not the raw fuel gas pump 26, which is an example of a gas component provided in the raw fuel gas supply pipe 21 among the plurality of auxiliary machines, may be determined whether or not the raw fuel gas pump 26 is in a stopped state.

Then, when the fuel cell 54 is in the power generation stopped state and the raw fuel gas pump 26 is in the operating state, the control device 100 performs control to wait for the power supply to the gas sensor 90 to be stopped, and keeps the gas sensor 90 on. It's okay.

Thereafter, when the fuel cell 54 is in the stopped state of power generation and the raw fuel gas pump 26 is stopped, the control device 100 performs control to stop the power supply to the gas sensor 90, even if the gas sensor 90 is turned off. good.

In this way, it is possible to prevent the power supply to the gas sensor 90 from being stopped even though the raw fuel gas pump 26 is in an operating state. Thereby, leakage of the raw fuel gas due to the operation of the raw fuel gas pump 26 can be detected.

In addition, in the control until the power supply to the gas sensor 90 is stopped, if the remote control 14 or the operation board 92 is not operated within a certain period of time after the gas valve 22 is closed, the control device 100 Control is performed to stop energizing the gas sensor 90, but regardless of whether or not the remote control 14 or the operation board 92 is operated, the energization to the gas sensor 90 is maintained for a certain period of time after the gas valve 22 is closed. , control may be performed to stop energizing the gas sensor 90. The above is an explanation of the control until the power supply to the gas sensor 90 is stopped.

Next, the flow of control up to the start of energization of the gas sensor 90 will be explained. FIG. 4 is a flowchart showing the flow of control up to the start of energizing the gas sensor 90 shown in FIG. This control up to the start of energizing the gas sensor 90 is executed when the gas valve 22 is closed in order to store the fuel cell system 10 for a long period of time. In the control up to the start of energizing the gas sensor 90, the following steps S11 to S13 are executed.

In step S11, the control device 100 determines that the relay 96 is in the closed state based on the history of control signals output to the relay 96 connected to the gas sensor 90 or the status signal output according to the open/closed state of the relay 96. In other words, it is determined whether the gas sensor 90 is turned on (in operation).

If the gas sensor 90 has not been turned off to store the fuel cell system 10 for a long period of time and is still on, the control device 100 determines that the gas sensor 90 is on (step S11: Yes), return. Then, the control device 100 repeatedly executes step S11 until it determines that the gas sensor 90 is turned off.

When the fuel cell system 10 is stored for a long period of time and the gas sensor 90 is turned off while step S11 is repeatedly executed, the control device 100 determines that the gas sensor 90 is turned off in step S11 (step S11: No), the process moves to step S12.

In step S12, the control device 100 determines whether the remote controller 14 or the operation board 92 has been operated.

If the remote controller 14 or the operation board 92 is not operated after the settings and maintenance for storing the fuel cell system 10 for a long period of time are completed and the gas sensor 90 is turned off, the control device 100 It is determined that there is no operation on the board 92 (step S12: No), and the process returns. Then, the control device 100 repeatedly executes steps S11 and S12 until it is determined that the remote controller 14 or the operation board 92 has been operated. Thereby, the gas sensor 90 is maintained off (stopped).

On the other hand, even after the gas sensor 90 is turned off, the operator operates the remote control 14 or the operation board 92 before opening the gas valve 22 in order to perform settings and maintenance that involve opening the gas valve 22. Sometimes. In this way, when the operator operates the remote controller 14 or the operation board 92 before opening the gas valve 22, an operation signal is output from the remote controller 14 or the operation board 92 to the control device 100.

In this way, if the remote controller 14 or the operation board 92 is operated after the gas sensor 90 is turned off, the control device 100 determines that the remote controller 14 or the operation board 92 is operated (step S12). :Yes), the process moves to step S13.

In step S13, the control device 100 performs control to start energizing the gas sensor 90, and turns on the gas sensor 90. Specifically, the control device 100 outputs a control signal that is a closing command to the relay 96 to close the relay 96. When the relay 96 is in the closed state, power supply from the power supply board 95 to the gas sensor 90 is started, and the gas sensor 90 is turned on.

In this way, even if the gas valve 22 is closed and the gas sensor 90 is turned off in order to store the fuel cell system 10 for a long period of time, the control device 100 can subsequently perform settings that involve opening the gas valve 22. When the remote controller 14 or the operation board 92 is operated to perform maintenance or the like, energization to the gas sensor 90 is started.

Therefore, even if it takes time to start the gas sensor 90, the gas sensor 90 can be started before the gas valve 22 is opened, or the gas sensor 90 can be started immediately after the gas valve 22 is opened. can be done. This can prevent a situation in which the leakage of raw fuel gas cannot be detected for a while after the gas valve 22 is opened, so that the leakage of raw fuel gas can be properly detected after the gas valve 22 is opened. can be detected.

Further, when the gas valve 22 is closed and the remote controller 14 or the operation board 92 is not operated, the gas sensor 90 is kept de-energized, thereby suppressing deterioration of the gas sensor 90 due to the energization. can do.

In this way, according to the fuel cell system 10 according to the present embodiment, leakage of raw fuel gas can be appropriately detected after the gas valve 22 is opened, while suppressing deterioration of the gas sensor 90 due to energization.

Note that the control device 100 has a function of performing control to maintain energization to the gas sensor 90 and then stop energization to the gas sensor 90 after the gas valve 22 is closed (a function to execute steps S1 to S3). ), and a function that performs control to start energizing the gas sensor 90 when the remote controller 14 or the operation board 92 is operated with the gas valve 22 closed (a function that executes steps S11 to S13) However, it may have only one of these functions.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and it is of course possible to implement various modifications other than the above without departing from the spirit thereof. It is.

DESCRIPTION OF SYMBOLS 10... Fuel cell system, 12... Fuel cell unit, 14... Remote controller (remote control), 20... Raw fuel gas supply device, 21... Raw fuel gas supply pipe, 22... Gas valve, 23... Desulfurizer, 24... Pressure sensor , 25... Flow rate sensor, 26... Raw fuel gas pump, 30... Oxidizing gas supply device, 31... Oxidizing gas supply pipe, 32... Air filter, 33... Flow rate sensor, 34... Blower, 40... Reformed water supply device, 41... Reformed water supply pipe, 42... Reformed water tank, 43... Ion exchange resin, 44... Reformed water pump, 50... Power generation module, 51... Module case, 52... Vaporizer, 53... Reformer, 54 ...fuel cell, 60...exhaust heat recovery device, 61...outgoing pipe, 62...returning pipe, 63...heat exchanger, 64...circulation pump, 70...hot water storage tank, 80...casing, 81...oxidizing gas intake port, 82... Ventilation port, 83... Ventilation filter, 90... Gas sensor, 91... Outside temperature sensor, 92... Operation board, 93... Display panel, 94... Power conditioner (power conditioner), 95... Power supply board, 96... Relay, 100... Control device, 101... Processor, 102... Memory, 103... Program, 110... Commercial power supply, 111... Load, 112... AC power line, 113... DC power line

Claims (3)

a power generation module connected to a raw fuel gas supply pipe that supplies raw fuel gas and having a fuel cell;
a gas valve provided in the raw fuel gas supply pipe;
a gas sensor that detects leakage of the raw fuel gas;
a control device that performs control to maintain energization to the gas sensor and then stop energization to the gas sensor after the gas valve is closed;
a remote controller or an operation board communicably connected to the control device;
Equipped with
The control device performs control to stop energizing the gas sensor if the remote controller or the operation board is not operated within a certain period of time after the gas valve is closed.
fuel cell system. Equipped with multiple auxiliary machines,
The control device waits for energization to the gas sensor to stop when the fuel cell is in a power generation stop state and a gas component installed in the raw fuel gas supply pipe among the plurality of auxiliary machines is in an operating state. , performing control to stop energizing the gas sensor when the fuel cell is in a state where power generation is stopped and the gas component is stopped;
The fuel cell system according to claim 1. Further comprising a remote controller or an operation board communicably connected to the control device,
The control device performs control to start energizing the gas sensor when the remote controller or the operation board is operated with the gas valve closed.
The fuel cell system according to claim 1 or claim 2.