JP2009301721A - Fuel battery power generator system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel battery power generator system which checks the presence or absence of a fuel gas sensor to control an antifreezing heater when a control means is incapable of temperature measurement. <P>SOLUTION: The fuel battery power generator system includes: a control means 2 which controls a series of operations such as start, power generation, and stoppage; a temperature measuring means 3 which measures an open-air temperature; a gas measuring means 16 which measures a fuel gas amount; a heater 7 which raises the temperature of a water passage; a temperature switch 14 which turns on or off the heater 7 when the temperature of the water passage reaches a given temperature; and a fuel gas control switch 15 which turns on or off the heater 7 when the amount of the fuel gas reaches a given gas amount. The heater 7 is connected in series to the fuel gas control switch 15 and the temperature switch 14. When the amount of the fuel gas is detected to be more than the given gas amount, based on a signal from the gas measuring means 16, the fuel gas control switch 15 goes off. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to prevention of freezing of a water path of a fuel cell power generation system.

  The fuel cell power generation system generates a fuel gas mainly composed of hydrogen from a source gas such as city gas by a hydrogen generator, and generates power by reacting the generated fuel gas with an oxidant gas.

  In addition, the fuel cell power generation system cools the heat generated when generating electricity or reforming the source gas such as city gas into hydrogen using a hydrogen generator by circulating cooling water and exhausting heat. Store the collected hot water in a hot water storage tank.

  Therefore, in the fuel cell power generation system, the hot water stored in the hot water storage tank is used as water for daily life in the floor and kitchen, etc., so the combined power generation efficiency (electric power) and exhaust heat recovery efficiency (heat) It is a highly efficient system that uses primary energy.

  As described above, it is important for the fuel cell power generation system to perform exhaust heat recovery during power generation in order to increase the utilization efficiency of primary energy. For this reason, a water path for performing exhaust heat recovery is provided. It has been.

  For example, a cooling path between the hot water storage tank and the fuel cell power generation device using a hot water storage pump or a cooling source between the cooling water tank of the fuel cell power generation device main body and a heat source such as a stack. For example, a route for circulating water.

  As described above, for the fuel cell power generation apparatus, it is essential to recover the exhaust heat in order to increase the utilization efficiency of the primary energy. However, when the outside air temperature drops below the freezing point in winter, the water path between the hot water storage tank and the fuel cell power generator described above and the water path between the cooling water tank and a heat source such as a stack freezes. The pipes ruptured or cracked and leaked water, and water circulation was not performed normally or water leaks could cause equipment failure.

Therefore, in the conventional technology, when the fuel cell power generation system is placed at a low temperature, a temperature sensor is installed to measure the temperature outside the device. The circulating water was maintained at a temperature higher than the freezing point by heating the circulating water between the fuel cell and the hot water storage tank (see, for example, Patent Document 1).
JP-A-11-164025

  However, as described above, when the fuel cell power generation system is stopped, the conventional configuration measures the temperature outside the apparatus with a temperature sensor such as a thermistor, and the measured temperature is determined by a control device such as a microcomputer. It is determined whether or not the temperature is equal to or lower than the predetermined temperature. If the temperature is equal to or lower than the predetermined temperature, an operation for preventing freezing of the water path is performed.

  Therefore, even if the amount of fuel gas exceeds the specified amount, if the temperature is below a predetermined temperature, the operation is performed to prevent the water path from freezing. When the amount of fuel gas exceeds the specified amount, There is a risk of causing a phenomenon such as tracking due to gas leakage.

  In order to solve the conventional problems, a fuel cell power generation system of the present invention includes a hydrogen generator that generates a fuel gas mainly composed of hydrogen from a hydrocarbon-based raw material gas and water, and a fuel gas and an oxidant gas. A stack for generating power by reacting, a waste heat recovery means for recovering heat from the stack, a control means for controlling a series of operations of starting, generating, and stopping, and a temperature measuring means for measuring the outside temperature A gas measuring means for measuring the amount of fuel gas, a heater for raising the temperature of the water path of the exhaust heat recovery means, and turning on / off the heater when the outside air temperature reaches a predetermined temperature based on a signal from the temperature measuring means. A temperature switch for switching, and a fuel gas control switch for switching on / off of the heater when the amount of the fuel gas reaches a predetermined amount based on a signal of the gas measuring means, and the heater controls the fuel gas. A switch and a temperature switch are connected in series, and the control means includes a gas measurement abnormality detection means for detecting an abnormality of the gas measurement means and a temperature measurement abnormality detection means for detecting an abnormality of the temperature measurement means, and the control When the means detects an abnormality of the gas measurement means based on the signal of the gas measurement abnormality detection means, the fuel gas control switch is forcibly turned off to turn off the heater.

  As a result, the present invention can be applied, for example, when the environment in which the fuel cell power generation system is installed is exposed to a low temperature in winter and the fuel cell power generation apparatus is in a stopped state where it is not used. When the temperature falls below the temperature, the heater for preventing freezing is turned on and the circulating water in the water path can be heated, and when the amount of fuel gas leaks beyond the specified amount, the fuel gas control switch Safety can be maintained by forcibly turning off and latching off the heater.

  In the fuel cell power generation system of the present invention, when the temperature of the installation environment of the fuel cell power generation system is lowered and the fuel cell power generation system is stopped, the temperature in the installation environment is equal to or lower than a predetermined temperature. The heater that turns on the freezing is turned on and the cooling water in the water path is heated to prevent water leakage due to rupture or cracking of the water path piping. When it is leaking, the heater is forcibly turned off so that safety can be maintained.

  A first invention includes a hydrogen generator that generates a fuel gas mainly composed of hydrogen from a hydrocarbon-based raw material gas and water, a stack that generates electricity by reacting the fuel gas and an oxidant gas, and a stack. Exhaust heat recovery means for recovering the heat of the engine, control means for controlling a series of operations of starting, generating, and stopping, temperature measuring means for measuring the outside air temperature, gas measuring means for measuring the amount of fuel gas, and exhaust heat A heater for raising the temperature of the water path of the recovery means, a temperature switch for switching the heater on / off when the outside air temperature reaches a predetermined temperature based on a signal from the temperature measurement means, and a fuel gas amount based on a signal from the gas measurement means And a fuel gas control switch that switches the heater on and off when the amount reaches a predetermined amount. The heater is connected in series with the fuel gas control switch and the temperature switch, and the control means detects an abnormality in the gas measurement means. Gas measurement abnormality detection means and temperature measurement abnormality detection means for detecting abnormality of the temperature measurement means, and when the control means detects abnormality of the gas measurement means based on the signal of the gas measurement abnormality detection means, The control switch is forcibly turned off to latch off the heater.

  According to the above configuration and operation, the fuel cell power generation system of the present invention is configured such that, even if the temperature of the installation environment decreases, the heater that prevents freezing is turned on when the temperature of the installation environment falls below a predetermined temperature. Since the cooling water of the passage is heated, it is possible to prevent water leakage due to rupture or cracking of the piping of the water passage, and when the gas leakage is detected, the heater is forcibly turned off. Can prevent ignition.

  According to a second invention, in the first invention, there is provided a runaway detection circuit for detecting runaway of the control means, and a runaway control switch for switching on / off of the heater when the control means runs away based on a signal of the runaway detection circuit. When the abnormality of the fuel gas amount is not detected based on the signal of the gas measurement abnormality detection means, if the control means goes out of control, the runaway control switch is forcibly turned on and the heater is turned on without going through the control means. .

  According to the above configuration and operation, when a control device such as a microcomputer goes out of control and becomes uncontrollable, even if the temperature of the installation environment of the fuel cell power generation system falls, no abnormality in the fuel gas amount is detected When the temperature in the installation environment falls below the specified temperature, the heater that prevents freezing is turned on and the cooling water in the water path is heated. Can do.

  According to a third invention, in the first or second invention, when a fuel gas abnormality is detected based on a signal from the gas measurement abnormality detection means, after a predetermined time has elapsed since the detection of the fuel gas abnormality, the gas If no abnormality of the fuel gas is detected based on the signal of the measurement abnormality detection means, the fuel gas control means is provided with a release means for canceling the abnormal state of the gas measurement means. The heater is turned off to enable on / off control of the heater.

  According to the above configuration and operation, by providing a canceling means for canceling the abnormality of the gas measuring means, even if a gas abnormality is detected due to a malfunction such as noise, the fuel gas is detected by the gas measuring abnormality detecting means after a predetermined time has elapsed. If no abnormality is detected, the control of the heater for preventing freezing can be continued by releasing the forced-off of the fuel gas control switch.

  According to a fourth aspect of the present invention, in the first or second aspect of the present invention, when a fuel gas abnormality is detected based on a signal from the gas measurement abnormality detection means, ventilation is performed to reduce the amount of fuel gas by blowing air. If a fuel gas abnormality is not detected based on the signal from the gas measurement abnormality detection means after a predetermined time has elapsed since the detection of the fuel gas abnormality, a forced off of the fuel gas control switch is released. The heater can be turned on / off.

  According to the above configuration and operation, by providing a ventilation device that reduces the amount of fuel gas by blowing air, even if the amount of fuel gas leaks beyond the specified amount, the amount of fuel gas falls below the specified amount by ventilating. After a predetermined time has elapsed since the abnormality was detected, if no abnormality is detected by the gas measurement abnormality detecting means, the heater control for preventing freezing can be continued.

  According to a fifth invention, in the first invention, a gas measurement power source for operating the gas measurement abnormality detecting means is provided, and the fuel gas amount can be monitored even when the fuel cell power generation system is stopped. .

  According to the above-described configuration and operation, it is possible to detect an abnormality in the fuel gas even when the fuel cell power generation system is stopped. Therefore, it is possible to control the heater that normally prevents freezing. Water leakage due to pipe rupture or cracking can be prevented.

  According to a sixth aspect of the present invention, there is provided a gas measurement power source for operating the gas measurement abnormality detection unit, a temperature measurement power source for operating the temperature measurement abnormality detection unit, and a control unit power source for operating the control unit. In addition, the fuel cell power generation system can be stopped even when the fuel gas amount, the outside air temperature, and the control means runaway are monitored.

  According to the above configuration and operation, it is possible to detect fuel gas abnormalities, temperature measurement abnormalities, and microcomputer runaway even when the fuel cell power generation system is stopped, thus preventing normal measurement and freezing of the outside temperature of the fuel cell power generation equipment Since the heater to be controlled can be controlled, water leakage due to rupture or cracking of the pipe in the water path can be prevented.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the present embodiment.
(Embodiment 1)
FIG. 1 shows an example of a configuration diagram of a fuel cell power generation system according to Embodiment 1 of the present invention.

  In FIG. 1, a fuel cell power generation system includes a fuel cell power generation apparatus 1 that generates hydrogen from raw material gas such as city gas, and hot water storage that collects heat generated during power generation and stores it in hot water storage tank 12 as hot water. The unit 11 is configured.

  The fuel cell power generation device 1 includes a control unit 2 that controls a series of operations of power generation and stop, a temperature measurement unit 3 that measures the outside temperature of the environment where the fuel cell power generation device 1 is installed, a fuel gas, and an oxidant. The heat generated from the exhaust gas from the stack 5 that generates power using gas, the exhaust heat recovery means 6a that recovers the heat of the stack 5 and the like by cooling using the cooling water stored in the cooling water tank 9 and the hydrogen generator 4 is used. The exhaust heat recovery means 6b to be recovered, the heater 7 for preventing the water path of the exhaust heat recovery means 6a and 6b from freezing, the cooling water is supplied to the water path of the exhaust heat recovery means 6a, and the exhaust heat from the hot water storage unit 11 A pump 8 is provided for supplying the recovery water to the water path of the exhaust heat recovery means 6b.

  The control unit 2 includes a temperature measurement abnormality detection unit 17 that detects an abnormality in the temperature measurement unit 3 and a gas measurement abnormality detection unit 18 that detects an abnormality in the gas measurement unit 16.

  The fuel cell power generation device 1 and the hot water storage unit 11 are connected by a communication cable 13a, and information such as the amount and temperature of hot water stored in the hot water storage tank 12, the power generation amount and the power generation time of the fuel cell power generation device 1, and the like. We are exchanging. In addition, information such as the amount and temperature of hot water, the amount of power generation, and the power generation time can be notified to the user by the display means 61 such as a remote controller connected to the hot water storage unit 11 via the communication cable 13b.

  However, even if the display means 61 is configured to be connected to the fuel cell power generator 1, various effects can be notified to the user, so the effects of the invention do not change.

  FIG. 2 shows an example of a configuration diagram for preventing freezing of the water path in the fuel cell power generator 1 according to Embodiment 1 of the present invention.

  In FIG. 2, the fuel cell power generator 1 includes a temperature switch 14 that turns on / off a heater 7 that prevents freezing of the water path according to the temperature state of the temperature measuring means 3 based on a command from the control means 2, and a gas measuring means. The fuel gas control switch 15 is used to turn off the heater 7 when the fuel gas amount 16 leaks over a prescribed amount. The temperature switch 14, the fuel gas control switch 15, and the heater 7 are provided. Are connected in series.

  Here, the temperature switch 14 includes a bimetal switch as a representative component. The bimetal switch closes when the temperature around the switch is below a predetermined temperature, and the temperature around the switch is higher than the predetermined temperature. It is like opening the switch.

  Next, the operation of the first embodiment of the present invention will be described with reference to FIGS. FIG. 3 is an operation flowchart in the case of abnormality of the fuel gas.

  First, the operation when the temperature of the environment in which the fuel cell power generation device 1 is installed decreases when the fuel cell power generation device 1 is operating normally will be described with reference to FIG.

  In most cases, the coherent battery power generation system including the fuel cell power generation apparatus 1 is usually installed outdoors because of the size of the product. In addition, when the fuel cell generates power, the stack 5 is cooled, or water used for cooling the heat generating portion, for example, the stack 5, is collected and stored in the hot water storage tank 12. Passing through.

  In summer and when the system is operating, the water in the pipes flows, and the temperature inside the equipment is definitely higher than the freezing point, so the water pipes burst or cracks due to freezing. It does n’t happen first.

  However, in winter, especially in cold regions, when the system does not operate for a while after traveling on a winter holiday, the water flow in the water circulation path stops, and when the system is not operating, heat is generated. Since there is no place, the temperature inside the system becomes almost equal to the outside air temperature, so that water in the pipe freezes, causing water leakage due to destruction or cracking, and may cause great damage to the system.

  Therefore, it is important to prevent the water in the pipe from freezing by heating the pipe with the heater 7 or circulating the water with the pump 8 when the temperature falls below a predetermined temperature.

  For example, as shown in FIG. 1, a freezing prevention heater 7 is installed at a location where the water pipe of the system is easily frozen. The heater 7 is connected to the system power supply as shown in FIG. 2, and the temperature switch 14 and the fuel gas control switch 15 connected in series with the heater 7 are used to control on / off of energization of the heater 7. Yes.

  However, even if the power supply source is a DC power source produced in the system, the power supply source only changes, so that freezing can be prevented and the effect of the invention does not change.

  In the case of a simple system, the heater 7 is turned on / off only by a temperature switch 14 such as a bimetal switch. When the temperature is low, the bimetal switch is closed. When the temperature is high, the bimetal is warped and the switch is opened to stop energization. At this time, the temperature for controlling on / off of the heater 7 is determined only by the set temperature specification of the temperature switch 14. Since the temperature switch 14 such as a bimetal switch has relatively large component variations, the temperature specification for closing / opening the switch is generally about ± 3 ° C. to 5 ° C.

  Therefore, in order to reliably turn on the heater 7 before freezing, it is necessary to select a component whose temperature specification for closing / opening the switch is, for example, about 5 ° C.

  As described above, the control of the freeze prevention heater 7 by the temperature switch 14 can surely prevent the water pipe from being broken.

  However, if the fuel gas is leaking over the specified amount and the heater is controlled based on the temperature condition alone, a high voltage will flow even though the gas is leaking. It will be.

  Therefore, as shown in the flowchart of FIG. 3, after confirming that no abnormality is detected in the gas measurement means 16 by the gas measurement abnormality detection means 18 (S100), the temperature state is confirmed (S101), and the heater is controlled. By performing (S103), the system can be operated more safely.

  Further, when the gas measurement abnormality detection means 18 detects an abnormality, the fuel gas control switch 15 connected in series with the heater and the temperature switch is forcibly turned off (S102), thereby causing the heater to be off-latched to cause tracking and the like. Can be eliminated.

  Next, an example of operation when the control unit 2 is in an uncontrollable state such as microcomputer runaway will be described with reference to FIGS. FIG. 5 is a flowchart showing the operation in the microcomputer runaway.

  As shown in FIG. 4, the fuel cell power generation device 1 according to Embodiment 1 of the present invention includes a runaway detection unit 20 that monitors whether the control unit 2 such as a microcomputer is operating normally.

  When the control means 2 such as a microcomputer is operating normally, a periodic pulse (for example, 500 Hz to 1 kHz) is output from the control means 2, and when the pulse is output, a runaway control switch that is a relay 19 is driven.

  When the control means 2 such as a microcomputer is not operating normally, it is impossible to output a pulse from the control means 2, and accordingly, the runaway control switch 19 that is a relay cannot be driven.

  Here, the runaway control switch 19 uses a normally closed type relay. Since it is a normally closed type relay, when the control means 2 is operating normally (when outputting a pulse), the switch is turned on when the runaway control switch 19 that is a relay is driven.

  Conversely, when the control means 2 is not operating normally (when no pulse is output), the runaway control switch 19 that is a relay is not driven, so the switch is turned off.

  If the runaway control switch 19 is off, the heater 7 can be energized if the outside air temperature drops and the temperature switch 14 is turned on.

  If the runaway control switch 19 does not operate normally (for example, the microcomputer is in a runaway state), the outside air temperature information measured by the temperature measuring means 3 cannot be recognized, and the runaway control switch 19 is driven. Control signal cannot be output.

  Therefore, in addition to the control signal that drives the runaway control switch 19 when the control means 2 is operating normally, by providing a circuit that turns on the runaway control switch 19 when the runaway of the control means 2 is detected, Since the runaway control switch 19 can be turned on even if the control means 2 becomes uncontrollable, the energization of the heater 7 can be controlled only by turning on / off the temperature switch 14 when the outside air temperature decreases. .

  Therefore, even when the control unit 2 becomes uncontrollable, water in the water path is frozen, and mechanical destruction such as water leakage due to pipe rupture or cracking can be prevented.

  Further, since the gas measurement abnormality detection means 18 detects the presence or absence of the fuel gas abnormality (S104), it is determined whether the control means 2 is out of control (S105). Is not turned on (S108) and the heater 7 is not energized (S107), so that the system can be operated safely even when the control means 2 is out of control.

When the control means 2 is not runaway, the temperature state is confirmed (S106), and the heater is controlled (S109).
(Embodiment 2)
In the second embodiment of the present invention, in addition to the first embodiment, after the gas measurement abnormality detecting means 18 detects an abnormality, the fuel gas amount is measured after a predetermined time has elapsed and no abnormality is detected. This is an example of whether to return to normal, and other configurations and operations are the same as those in the first embodiment.

  Therefore, hereinafter, the configuration and operation of the second embodiment will be described with a focus on differences from the first embodiment, and other configurations and operations will be the same as those of the first embodiment.

  First, the configuration of the third embodiment will be described with reference to FIGS.

  FIG. 7 is an operation flowchart in normal recovery, and FIG. 8 is an operation flowchart in normal recovery including the ventilation means 21.

  First, the operation of releasing the abnormality of the gas measurement abnormality detecting means 18 and returning to normal will be described with reference to FIGS.

  The gas measurement abnormality detection means 18 determines whether or not the gas measurement means 16 is abnormal (S110). If abnormal, the fuel gas control switch 15 is forcibly turned off and the heater 7 is de-energized (S113).

  The gas measurement abnormality detection means 18 detects an abnormality of the gas measurement means 16 again after a predetermined time (S116) (S117), and if it is less than the predetermined value, the off-latch of the fuel gas control switch 15 is released. In step S118, the normal heater 7 control can be performed.

  Therefore, even when the gas measurement abnormality detection means 18 is erroneously determined to be abnormal due to a malfunction such as noise, if the fuel gas amount falls below a predetermined value after a predetermined time has elapsed, the fuel gas control is performed. Since the off-latch of the switch 15 can be released, freezing can be prevented more safely.

  When the ventilation means 21 is provided as shown in FIG. 6, as shown in FIG. 8, when an abnormality is detected by the gas measurement abnormality detection means 18 (S119), the fuel gas control switch 15 is forcibly turned off. At the same time (S122), the ventilation means 21 for blowing the fuel gas is operated (S123), the fuel gas leaked into the system is ventilated, and after a predetermined time has passed (S126), the gas measurement means 16 is abnormal again. Is detected (S127), and if it is equal to or less than the predetermined value, the off-latch of the fuel gas control switch 15 is released (S128), and the ventilation means 21 is turned off (S129).

Therefore, even when the fuel gas is actually leaking, if the fuel gas amount in the ventilation means 21 becomes a predetermined value or less, the normal heater 7 control can be performed, and freezing can be prevented more reliably. it can.
(Embodiment 3)
The third embodiment is an example in which freezing is prevented even when the fuel cell power generation system is stopped in addition to the first embodiment, and other configurations and operations are the same as those of the first embodiment. It is.

  Therefore, hereinafter, the configuration and operation of the third embodiment will be described with a focus on differences from the first embodiment, and other configurations and operations will be the same as those of the first embodiment.

  First, the configuration of the third embodiment will be described with reference to FIGS.

  In FIG. 9, even if the fuel cell power generation system is stopped, if an abnormality in the fuel gas is not detected, an accident such as tracking may occur, so the gas measurement abnormality detecting means 18 and the fuel gas control switch 15 A gas measurement abnormality detecting means power source 22 for operating the fuel gas is provided so that the presence or absence of fuel gas leakage can be detected even when the system is stopped.

  Further, in FIG. 10, in order to determine the presence or absence of abnormality of the fuel gas, the presence or absence of runaway control means, and the presence or absence of abnormality of the temperature measurement means even when the fuel cell power generation system is stopped, 18 for operating gas measurement abnormality detecting means for operating 18, a power supply for controlling means 23 for operating control means 2, and a power supply for temperature measurement abnormality detecting means 24 for operating temperature measurement abnormality detecting means 17. The system can be used more safely by making it possible to detect the presence or absence of fuel gas leakage, the presence or absence of runaway control means, and the presence or absence of abnormality in the temperature measurement means even when the system is stopped.

  The fuel cell power generator system of the present invention can be used for anti-freezing control of pipes when fuel gas is abnormal in a fuel cell power generator system, an engine power generator system, or a system having a water pipe such as a water heater. it can.

1 is a configuration diagram of a fuel cell power generator system including a fuel cell power generator according to Embodiment 1 of the present invention. Configuration diagram of the fuel cell power generator Operation flow chart of the fuel cell power generator Configuration diagram of the fuel cell power generator when the microcomputer runs away in the fuel cell power generator Flow chart of the operation of the fuel cell power generator during microcomputer runaway in the fuel cell power generator Configuration diagram of fuel cell power generator in Embodiment 2 of the present invention Operation flow chart of the fuel cell power generator Operation flowchart when operating the ventilation means of the fuel cell power generator Configuration diagram of fuel cell power generator in Embodiment 3 of the present invention Configuration diagram of the fuel cell power generator when the microcomputer runs away

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fuel cell power generation device 2 Control means 3 Temperature measurement means 4 Hydrogen generator 5 Stack 6a, 6b Waste heat recovery means 7 Heater 8 Pump 9 Cooling water tank 11 Hot water storage unit 12 Hot water storage tank 13a, 13b Communication cable 14 Temperature switch 15 Fuel gas Control switch 16 Gas measurement means 17 Temperature measurement abnormality detection means 18 Gas measurement abnormality detection means 19 Runaway control switch 20 Runaway detection means 21 Ventilation means 22 Power supply for gas measurement abnormality detection means 23 Power supply for control means 24 Temperature measurement abnormality detection means Power supply

Claims (6)

A hydrogen generator that generates a fuel gas mainly composed of hydrogen from a hydrocarbon-based raw material gas and water, a stack that generates electricity by reacting the fuel gas and an oxidant gas, and recovers heat from the stack, etc. Waste heat recovery means, control means for controlling a series of operations of startup, power generation, and shutdown, temperature measurement means for measuring the outside air temperature, gas measurement means for measuring the amount of fuel gas, and water in the exhaust heat recovery means A heater for raising the temperature of the path, a temperature switch for switching on / off of the heater when the outside air temperature reaches a predetermined temperature based on a signal from the temperature measuring means, and a predetermined amount of the fuel gas based on a signal from the gas measuring means A fuel gas control switch that switches on / off of the heater when the amount of the fuel gas reaches a predetermined amount, the heater is connected in series with the fuel gas control switch and the temperature switch, and the control means A gas measurement abnormality detection means for detecting an abnormality of the gas measurement means and a temperature measurement abnormality detection means for detecting an abnormality of the temperature measurement means, wherein the control means is configured to detect the gas based on a signal from the gas measurement abnormality detection means. When an abnormality in the measuring means is detected, the fuel gas control system forcibly turns off the fuel gas control switch and off-latches the heater. A runaway detection circuit for detecting runaway of the control means, and a runaway control switch for switching on / off of the heater when the control means runs out of control based on a signal of the runaway detection circuit, the gas measurement abnormality detection means When an abnormality in the amount of fuel gas is not detected based on the signal, if the control means runs out of control, the runaway control switch is forcibly turned on and the heater is turned on without going through the control means. Item 4. The fuel cell power generation system according to Item 1. When a fuel gas abnormality is detected based on a signal from the gas measurement abnormality detection means, a fuel gas abnormality is detected based on a signal from the gas measurement abnormality detection means after a predetermined time has elapsed since the detection of the fuel gas abnormality. If the gas measurement means is released, the fuel gas control switch is forcibly turned off and the heater is turned on / off. The fuel cell power generator system according to claim 1 or 2, wherein off-control is possible. When a fuel gas abnormality is detected based on the signal of the gas measurement abnormality detection means, a ventilation device is provided that allows the amount of fuel gas to be reduced by blowing air, and a predetermined amount of time is detected after the fuel gas abnormality is detected. If no abnormality of the fuel gas is detected based on the signal from the gas measurement abnormality detecting means after the time has elapsed, the forced off of the fuel gas control switch is released, and the heater on / off control is enabled. The fuel cell power generation system according to claim 1 or 2. The fuel cell power generation system according to claim 1, further comprising a gas measurement power source for operating the gas measurement abnormality detection means, wherein the fuel gas amount can be monitored even when the fuel cell power generation system is stopped. A gas measurement power source for operating the gas measurement abnormality detection unit, a temperature measurement power source for operating the temperature measurement abnormality detection unit, and a control unit power source for operating the control unit, The fuel cell power generation system according to claim 2, wherein the fuel cell power generation system can be monitored even when the fuel cell power generation system is stopped.

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