JP2008251446A - Operation method for fuel cell power generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an operation method for a fuel cell power generator, wherein operation can be performed to restrain degradation in power generation performance when the fuel cell power generator is installed with nitrogen gas filled with a fuel gas generating section and a fuel cell. <P>SOLUTION: The fuel cell power generator includes a normal flow path Ru for supplying fuel gas generated by a fuel gas generating section P to a fuel cell G and for supplying exhaust fuel gas discharged from the fuel cell G after use for power generation to a reforming burner 3, and a cell bypass flow path Rb for supplying the fuel gas generated by the fuel gas generating section P to the reforming burner 3 bypassing the fuel cell G. Under a condition where the nitrogen gas is filled with the fuel gas generating section P and the fuel cell G, raw fuel is supplied by means of a raw fuel supply means K in a state where the normal flow path Ru is switched to a normal flow state or in a state where both of the normal flow path Ru and the cell bypass flow path Rb are switched to a normal flow state before a starting process is performed, and initial substitution process is performed to substitute the raw fuel for the nitrogen gas filled with the fuel gas generating section P and the fuel cell G. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a method for operating a fuel cell power generator, and more specifically,
A desulfurization section that desulfurizes hydrocarbon-based raw fuel supplied from the raw fuel supply means, and a desulfurization raw fuel supplied from the desulfurization section is reformed mainly with hydrogen gas by steam while being heated by a reforming burner A fuel gas generation unit that includes a reforming unit that performs a reforming process on the processing gas, and that generates a fuel gas mainly composed of hydrogen gas;
A fuel cell that is supplied with fuel gas from the fuel gas generator and generates power;
A steam generation unit that mixes reforming steam generated by heating the supplied reforming water with the raw fuel supplied from the desulfurization unit to the reforming unit;
A normal flow path for supplying the fuel gas generated in the fuel gas generation unit to the fuel cell and supplying exhaust fuel gas discharged from the fuel cell after being used for power generation to the reforming burner;
In the fuel cell power generation apparatus provided with a battery bypass flow path that bypasses the fuel cell and supplies the fuel gas generated in the fuel gas generator to the reforming burner,
When stopping, the combustion of the reforming burner is stopped, and until the temperature of the reforming section falls to a temperature at which the raw fuel can be prevented from thermal decomposition and water vapor condensation can be prevented, Among the supply and the supply of steam by the steam generation unit, at least the supply of steam by the steam generation unit is continued, and the temperature of the reforming unit is lowered to a temperature at which the raw fuel can be prevented from being thermally decomposed and the steam can be prevented from condensing. And stopping the supply of water vapor by the water vapor generation unit and supplying the raw fuel by the raw fuel supply means, and performing a process at the time of filling the fuel gas generation unit and the fuel cell with the raw fuel,
At the time of start-up, combustion of the reforming burner is started, and when the temperature of the reforming unit rises to a temperature at which the raw fuel can be prevented from thermal decomposition and steam condensation can be prevented, steam supply by the steam generating unit When the raw fuel filled in the fuel gas generation unit and the fuel cell is replaced with water vapor, and the temperature of the reforming unit is raised to a temperature capable of reforming, the raw fuel supply is started. The present invention relates to a method for operating a fuel cell power generation apparatus that performs a start-up process for starting supply of raw fuel by means.

In such a fuel cell power generation device, a fuel gas containing hydrogen gas as a main component is generated in a fuel gas generation unit, and the generated fuel gas is supplied to the fuel cell to generate power in the fuel cell.
For example, city gas (for example, 13A based on natural gas) as an example of a hydrocarbon-based raw fuel contains a sulfur component as an odorant, and the raw fuel contains a sulfur component. Therefore, the fuel gas generation unit is provided with a desulfurization unit, and the raw fuel desulfurized in the desulfurization unit is supplied to the reforming unit and the raw fuel supplied from the desulfurization unit to the reforming unit. Steam is mixed with the fuel by the steam generator, and in the reforming section, the raw fuel is reformed by the steam into a reformed gas containing hydrogen gas as a main component while being heated by the reforming burner. The quality treatment gas is supplied to the fuel cell as a fuel gas.

  In the normal operation state where power is generated by the fuel cell, the normal flow path is made to flow and the fuel gas generated in the fuel gas generator is supplied to the fuel cell and used for power generation from the fuel cell. Then, the exhaust fuel gas discharged after being supplied is supplied to the reforming burner as a combustion gas, and the exhaust fuel gas is combusted by the reforming burner.

By the way, in such a fuel cell power generation device, the operation is stopped while water vapor remains in the fuel gas generation unit or the fuel cell, and the residual water vapor is condensed during the stop, or the fuel gas is generated while the operation is stopped. If air enters the fuel cell or the fuel cell, the activity of the reforming catalyst in the reforming unit or the electrode catalyst of the fuel cell may be reduced. A stop-time process for filling the fuel gas generation unit and the fuel cell with the working gas is performed.
When an inert gas such as nitrogen gas is used as the purge gas, an inert gas supply facility such as a cylinder is required. Therefore, in recent years, as an inert gas supply facility is not required, Raw fuel is used.

When this raw fuel is heated in a state where water vapor is not mixed, depending on the heating temperature, pyrolysis occurs and carbon is precipitated, and the reforming catalyst of the reforming part, the electrode catalyst of the fuel cell, etc. There is a risk of reducing the activity of the catalyst.
Therefore, in the stop process, the combustion of the reforming burner is stopped, and the raw fuel supply means is used until the temperature of the reforming section falls to a temperature at which the raw fuel can be prevented from thermal decomposition and water vapor condensation can be prevented. When at least the water vapor supply by the water vapor generation unit is continued among the fuel supply and the water vapor generation by the water vapor generation unit, and the temperature of the reforming unit falls to a temperature at which the raw fuel can be prevented from thermal decomposition and water vapor condensation can be prevented. The supply of water vapor by the water vapor generation unit is stopped and the raw fuel is supplied by the raw fuel supply means so that the raw fuel is filled in the fuel gas generation unit and the fuel cell so that the raw fuel is not thermally decomposed and the water vapor is supplied. The fuel gas generator and the fuel cell are filled with the raw fuel in a state that does not remain.

  At the time of start-up, combustion of the reforming burner is started, and when the temperature of the reforming section rises to a temperature at which the raw fuel can be prevented from thermal decomposition and steam condensation can be prevented, the steam generation section supplies steam. When the raw fuel filled in the fuel gas generation unit and the fuel cell is replaced with water vapor and the temperature of the reforming unit rises to a temperature at which the reforming process can be performed, By performing the start-up process for starting the supply, the temperature of the reforming unit is raised to a temperature at which the reforming process can be performed without thermally decomposing the raw fuel charged in the fuel gas generation unit and the fuel cell at the time of stoppage. It is designed to warm up. (For example, refer to Patent Document 1).

Incidentally, although not clearly described in the above-mentioned Patent Document 1, the start-up process is performed in a state where the normal flow path is switched to the flow-through state, and the time for the start-up process is the fuel gas. The time required to replace the raw fuel filled in the generator and the fuel cell with water vapor was set.
Although not described in the above-mentioned Patent Document 1, it is conceivable that the startup process is performed in a state where both the normal flow path and the battery bypass flow path are switched to the flow state.

JP 2006-344408 A

  By the way, when such a fuel cell power generation device is shipped from a manufacturer or when the fuel cell power generation device is relocated, in order to prevent a decrease in activity of a catalyst such as a reforming catalyst of a reforming unit or an electrode catalyst of a fuel cell. Since the fuel gas generation unit and the fuel cell are filled with nitrogen gas, the fuel cell power generator is installed in a state where the fuel gas generation unit and the fuel cell are filled with nitrogen gas.

In the conventional fuel cell power generator, the above-described normal start-up process is performed even when the fuel gas generator and the fuel cell are started in a state where nitrogen gas is charged.
That is, in the conventional fuel cell power generation device, the normal start-up process is performed to discharge the nitrogen gas filled in the fuel gas generation unit and the fuel cell.
However, in the normal start-up process, it takes a short time to sufficiently discharge the nitrogen gas filled in the fuel gas generation unit and the fuel cell, and the nitrogen gas filled in the fuel gas generation unit and the fuel cell is removed. There was a possibility that it could not be discharged sufficiently.
In addition, in the start-up process, the steam generation unit supplies the steam to the flow path connecting the desulfurization unit and the reforming unit, and the raw gas filled in the fuel gas generation unit and the fuel cell is converted into the steam. When replacing the raw fuel with water vapor in this way, since water vapor does not flow through the desulfurization section, in particular, nitrogen gas filled in the desulfurization section cannot be discharged. there were.

  If nitrogen gas remains in the fuel gas generator or the fuel cell, the nitrogen reacts with hydrogen generated by the reforming process of the raw fuel according to the following reaction formula to generate ammonia. The electrode catalyst and the like are poisoned, and there is a possibility that the power generation performance may be lowered, and an improvement is desired.

N ₂ + 3H ₂ → 2NH ₃

  In addition, the condensed water obtained by condensing the water vapor contained in the reformed gas may be used not only for the reforming water but also for humidifying the polymer electrolyte membrane in the polymer type fuel cell. In this case, if ammonia is dissolved in the condensed water, the electrode catalyst is poisoned and the power generation performance is lowered, and this point is also desired to be improved.

  The present invention has been made in view of such circumstances, and its purpose is to operate so as to suppress a decrease in power generation performance when the fuel gas generation unit and the fuel cell are installed with nitrogen gas. An object of the present invention is to provide a method for operating a fuel cell power generator.

The first characteristic configuration of the operation method of the fuel cell power generator according to the present invention is that the desulfurization section for desulfurizing the hydrocarbon-based raw fuel supplied from the raw fuel supply means and the desulfurization raw fuel supplied from the desulfurization section are modified. A reformer that reforms the reformed gas mainly composed of hydrogen gas with water vapor in a heated state by a quality burner, and a fuel gas generator that produces fuel gas mainly composed of hydrogen gas;
A fuel cell that is supplied with fuel gas from the fuel gas generator and generates power;
A steam generation unit that mixes reforming steam generated by heating the supplied reforming water with the raw fuel supplied from the desulfurization unit to the reforming unit;
A normal flow path for supplying the fuel gas generated in the fuel gas generation unit to the fuel cell and supplying exhaust fuel gas discharged from the fuel cell after being used for power generation to the reforming burner;
In the fuel cell power generation apparatus provided with a battery bypass flow path that bypasses the fuel cell and supplies the fuel gas generated in the fuel gas generator to the reforming burner,
When stopping, the combustion of the reforming burner is stopped, and until the temperature of the reforming section falls to a temperature at which the raw fuel can be prevented from thermal decomposition and water vapor condensation can be prevented, Among the supply and the supply of steam by the steam generation unit, at least the supply of steam by the steam generation unit is continued, and the temperature of the reforming unit is lowered to a temperature at which the raw fuel can be prevented from being thermally decomposed and the steam can be prevented from condensing. And stopping the supply of water vapor by the water vapor generation unit and supplying the raw fuel by the raw fuel supply means, and performing a process at the time of filling the fuel gas generation unit and the fuel cell with the raw fuel,
At the time of start-up, combustion of the reforming burner is started, and when the temperature of the reforming unit rises to a temperature at which the raw fuel can be prevented from thermal decomposition and steam condensation can be prevented, steam supply by the steam generating unit When the raw fuel filled in the fuel gas generation unit and the fuel cell is replaced with water vapor, and the temperature of the reforming unit is raised to a temperature capable of reforming, the raw fuel supply is started. An operation method of a fuel cell power generation device that performs a start-up process for starting supply of raw fuel by means,
In a state in which the fuel gas generation unit and the fuel cell are filled with nitrogen gas, the normal flow path is switched to the normal flow state before the start-up process, or the normal flow is performed. The raw fuel is supplied by the raw fuel supply means in a state in which both the path and the battery bypass flow path are switched to the flowing state, and the nitrogen gas filled in the fuel gas generation unit and the fuel cell is supplied. It is characterized in that an initial replacement process for replacing with raw fuel is performed.

  That is, in a state where the fuel gas generation unit and the fuel cell are filled with nitrogen gas, the normal flow path is switched to the flow state or the normal flow path and the battery before the start-up process is performed. Initial replacement in which the raw fuel is supplied by the raw fuel supply means and the nitrogen gas filled in the fuel gas generation unit and the fuel cell is replaced with the raw fuel in a state where both bypass flow paths are switched to the flow state. Execute the process.

In other words, in the state where the fuel gas generation unit and the fuel cell are filled with nitrogen gas, the initial replacement process is executed before the start-up process, and the normal replacement path is in the initial replacement process. In a state where the fuel gas generating unit and the fuel cell are filled with the raw fuel supply means, the normal gas supply path and the battery bypass flow path are switched to the flow state. By supplying the raw fuel for a time that can be reliably discharged, the nitrogen gas filled in the fuel gas generator and the fuel cell is reliably discharged through the reformer burner, and is supplied to the fuel gas generator and the fuel cell. The filled nitrogen gas can be replaced with raw fuel.
In the initial replacement process, the raw fuel is supplied from the desulfurization unit to the reforming unit and the fuel cell by the raw fuel supply means, so that the fuel gas generation unit reliably includes the filled nitrogen gas including the desulfurization unit. Of course, it can be discharged and replaced with raw fuel.
And since the nitrogen gas with which a fuel gas production | generation part and a fuel cell are filled can be discharged | emitted reliably, it becomes possible to prevent that ammonia is produced | generated and suppress the fall of electric power generation performance. Can do.
Accordingly, it is possible to provide a method of operating a fuel cell power generator that can be operated so as to suppress a decrease in power generation performance when the fuel gas generation unit and the fuel cell are filled with nitrogen gas. It was.

The second characteristic configuration is a method of operating the fuel cell power generation device having the same premise configuration as the first characteristic configuration,
In a state in which the fuel gas generation unit and the fuel cell are filled with nitrogen gas, the raw fuel supply is performed in a state in which the battery bypass flow path is switched to a flow state before the start-up process is performed. The raw fuel is supplied by the means, and the nitrogen gas filled in the fuel gas generation unit is replaced with the raw fuel, and then the state in which the normal flow path is switched to the flow state or the normal flow is obtained. The raw fuel is supplied by the raw fuel supply means in a state where both the flow path and the battery bypass flow path are switched to the flowing state, and the nitrogen gas filled in the fuel cell is replaced with the raw fuel. It is characterized in that an initial replacement process is executed.

  That is, in a state where the fuel gas generation unit and the fuel cell are filled with nitrogen gas, the raw fuel supply means supplies the raw fuel in a state in which the battery bypass flow path is switched to the flow state before the start-up process is performed. Supply the fuel and replace the nitrogen gas filled in the fuel gas generator with the raw fuel, and then switch to the normal flow path through the normal flow path, or the normal flow path and battery bypass In the state where both of the flow paths are switched to the flow state, the raw fuel is supplied by the raw fuel supply means, and an initial replacement process is performed in which the nitrogen gas filled in the fuel cell is replaced with the raw fuel.

That is, in a state where the fuel gas generation unit and the fuel cell are filled with nitrogen gas, the initial replacement process is performed before the start-up process. In the initial replacement process, first, the battery bypass flow path is set. In the state of switching to the flow state, the raw fuel supply means supplies the raw fuel for a time during which the nitrogen gas charged in the fuel gas generation unit can be reliably discharged, and then the normal flow path. In the state of switching to the flow-through state, or the state of switching to the flow-through state of both the normal flow path and the battery bypass flow path, the raw fuel supply means ensures the nitrogen gas filled in the fuel cell. By supplying the raw fuel for the time that can be discharged, the nitrogen gas filled in the fuel gas generation unit and the fuel cell is surely discharged through the reformer burner and filled in the fuel gas generation unit and the fuel cell. Has been The nitrogen gas can be replaced with the original fuel.
In the initial replacement process, the raw fuel is supplied from the desulfurization unit to the reforming unit and the fuel cell by the raw fuel supply means, so that the fuel gas generation unit reliably includes the filled nitrogen gas including the desulfurization unit. Of course, it can be discharged and replaced with raw fuel.
And since the nitrogen gas with which a fuel gas production | generation part and a fuel cell are filled can be discharged | emitted reliably, it becomes possible to prevent that ammonia is produced | generated and suppress the fall of electric power generation performance. Can do.
Accordingly, it is possible to provide a method of operating a fuel cell power generator that can be operated so as to suppress a decrease in power generation performance when the fuel gas generation unit and the fuel cell are filled with nitrogen gas. It was.

In addition to the first or second feature configuration, the third feature configuration is
The initial replacement process is terminated when the raw fuel replaced with the nitrogen gas charged in the fuel gas generation unit and the fuel cell is burned in the reforming burner.

That is, when the raw fuel replaced with the nitrogen gas filled in the fuel gas generation unit and the fuel cell is combusted in the reforming burner, the initial replacement process is terminated.
That is, when the raw fuel is supplied by the raw fuel supply means, the nitrogen gas filled in the fuel gas generation unit and the fuel cell is pushed away by the fuel gas, reaches the reformer burner, and is discharged from the reformer burner. Therefore, when the raw fuel replaced with the nitrogen gas filled in the fuel gas generation unit and the fuel cell is burned in the reformer burner, the nitrogen gas filled in the fuel gas generation unit and the fuel cell is surely Will be discharged.
Therefore, when the raw gas replaced with the nitrogen gas filled in the fuel gas generation unit and the fuel cell is burned in the reformer burner, the initial replacement process is terminated, thereby providing the raw fuel supply means. Therefore, it is possible to reliably discharge the nitrogen gas filled in the fuel gas generation unit and the fuel cell while preventing the wasteful consumption of the raw fuel by supplying the raw fuel for an unnecessarily long time. it can.
Therefore, when the fuel gas generator and the fuel cell are installed with nitrogen gas, the fuel cell power generator can be operated so as to suppress a decrease in power generation performance without wasting raw fuel. It became possible to provide a method.

The fourth characteristic configuration is an operation method of the fuel cell power generation device of the same premise configuration as the first characteristic configuration,
In the startup process,
When the fuel gas generating unit and the fuel cell are filled with nitrogen gas, after the start of the supply of raw fuel by the raw fuel supply means, until the set time for detour processing for nitrogen elapses, the battery A state in which the bypass flow path is switched to a flow state, and when the set time for the bypass process for nitrogen elapses, the normal flow path is switched to a flow state; and
When the fuel gas generation unit and the fuel cell are filled with raw fuel, after the raw fuel supply by the raw fuel supply means is started, the raw fuel for the raw fuel is shorter than the detour processing set time for nitrogen. The battery bypass flow path is switched to the flow state until the detour processing set time elapses, and the normal flow path is switched to the flow state when the raw fuel detour processing set time elapses. It is characterized by switching.

  That is, in the start-up process, when the fuel gas generation unit and the fuel cell are filled with nitrogen gas, after the start of the supply of raw fuel by the raw fuel supply means, until the set time for bypass processing for nitrogen elapses The battery bypass flow path is switched to the flow-through state, the normal flow path is switched to the flow-through state when the detour processing set time for nitrogen elapses, and the fuel gas generator and the fuel cell are switched to the original state. When the fuel is filled, the battery bypass is performed after the raw fuel supply means starts supplying the raw fuel until the detour processing set time for the raw fuel is shorter than the detour processing set time for nitrogen. The flow path is switched to the flow state, and when the raw fuel detour setting time elapses, the normal flow path is switched to the flow state.

  In other words, even if the temperature of the reforming section is raised to a temperature at which the reforming process can be performed and the supply of raw fuel is started by the raw fuel supply means in the startup process, the reforming process is unstable at the initial stage. Since the composition of the fuel gas generated in step 1 may become unstable, the battery bypass flow path will remain in the flow state until the bypass processing set time elapses after the raw fuel supply means starts supplying the raw fuel. In the switched state, fuel gas having an unstable composition is prevented from being supplied to the fuel cell.

Then, the detour processing set time for nitrogen in the start-up process executed when the fuel gas generation unit and the fuel cell are filled with nitrogen gas, and the fuel gas generation unit and the fuel cell are filled with raw fuel During the start-up process that is performed in the case where the fuel gas generation unit including the desulfurization unit has nitrogen remaining and ammonia may be generated by making it longer than the setting time for the detour processing for raw fuel In the state in which the battery bypass flow path is switched to the flow-through state, the fuel gas that may contain ammonia is not supplied to the fuel cell, so that a decrease in power generation performance can be suppressed.
Accordingly, it is possible to provide a method of operating a fuel cell power generator that can be operated so as to suppress a decrease in power generation performance when the fuel gas generation unit and the fuel cell are filled with nitrogen gas. It was.

In addition to the fourth feature configuration, the fifth feature configuration includes:
The nitrogen bypass processing set time is 1.5 times or more of the raw fuel bypass processing set time.

That is, by setting the setting time for bypass processing for nitrogen to 1.5 times or more of the setting time for bypass processing for raw fuel, the fuel gas is supplied to the fuel cell after ammonia is not contained. Can do.
In other words, as a result of various experiments, by setting the detour processing setting time for nitrogen to 1.5 times or more of the detour processing setting time for raw fuel, nitrogen is contained in the fuel gas generation unit including the desulfurization unit. It has been found that ammonia can be prevented from being contained in the fuel gas supplied to the fuel cell in a state where it does not remain.
Therefore, when the fuel gas generation unit and the fuel cell are installed with nitrogen gas, the fuel gas generation unit and the fuel cell can be operated so as to further suppress the decrease in power generation performance.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described based on the drawings.
As shown in FIG. 1, the fuel cell power generation apparatus includes a desulfurization unit 1 for desulfurizing a hydrocarbon-based raw fuel gas supplied from a raw fuel supply unit K serving as a raw fuel supply unit, and a supply from the desulfurization unit 1. And a reforming unit 2 for reforming the desulfurized raw fuel gas into a reformed gas containing hydrogen gas as a main component by steam in a heated state by the reformer burner 3, and a fuel mainly containing hydrogen gas The fuel gas generating unit P that generates gas, the fuel cell G that generates power by supplying fuel gas from the fuel gas generating unit P, and the desulfurization steam for reforming treatment that is generated by heating the reforming water that is supplied A steam generation unit B mixed with the raw fuel gas supplied from the unit 1 to the reforming unit 2 and a fuel gas generated by the fuel gas generation unit P are supplied to the fuel cell G and from the fuel cell G Exhaust fuel gas discharged after being used for power generation A normal flow path Ru for supplying the reforming burner 3 and a battery bypass flow path Rb for supplying the fuel gas generated in the fuel gas generator P to the reforming burner 3 bypassing the fuel cell G The normal flow state in which the normal flow route Ru is passed, the battery bypass flow state in which the battery bypass flow route Rb is passed, the normal flow route Ru, and the battery bypass flow route There are provided a flow path switching unit S that can be switched to a parallel flow state that allows both of Rb to flow, and an operation control unit C that controls the operation.

  Since the fuel cell G is well known and will not be described in detail and will be briefly described, the fuel cell G includes, for example, a plurality of cells having a solid polymer film as an electrolyte layer in a stacked state. It is configured as a solid polymer type, fuel gas is supplied from the fuel gas generation unit P to the fuel electrode of each cell through the fuel gas supply path 7, and air is supplied from the reaction blower 4 to the oxygen electrode of each cell. Power generation is performed by an electrochemical reaction between hydrogen and oxygen.

  In addition to the desulfurization chamber 1 and the reforming unit 2, the fuel gas generation unit P converts carbon monoxide gas in the reformed gas supplied from the reforming unit 2 into carbon dioxide gas using water vapor. It comprises a shift unit 5 that performs a shift process, a selective oxidation unit 6 that selectively oxidizes the carbon monoxide gas remaining in the reformed gas supplied from the shift unit 5, and the like. It is configured to generate a hydrogen-containing gas having a low carbon concentration.

  A power generation raw fuel supply path 8 for supplying raw fuel gas is connected to the desulfurization unit 1, and desulfurized raw fuel gas desulfurized in the desulfurization unit 1 is supplied to the reforming unit 2, and the reforming unit The desulfurization process is performed so that the reforming process gas reformed in 2 is supplied to the shift converter 5, and the reformed process gas converted in the shift section 5 is supplied to the selective oxidation unit 6. 1, the reforming unit 2, the transformation unit 5, and the selective oxidation unit 6 are connected to each other through a gas processing flow path 9, and the reformed gas that has been selectively oxidized by the selective oxidation unit 6 is used as a fuel gas. The fuel gas is supplied to the fuel electrode of the fuel cell G through the fuel gas supply path 7.

The power generation raw fuel supply passage 8 adjusts the power generation raw fuel intermittent valve V1 for intermittently supplying the raw fuel gas to the desulfurization unit 1 and the supply amount of the raw fuel gas to the desulfurization unit 1. A power generation raw fuel control valve V2 is provided.
That is, the raw fuel supply section K is constituted by the power generation raw fuel supply path 8, the power generation raw fuel intermittent valve V1, and the power generation raw fuel control valve V2.

In the desulfurization section 1, the sulfur component in the raw fuel gas is hydrogenated by a desulfurization reaction catalyst, and the hydride is adsorbed on zinc oxide or the like to desulfurize.
In the reforming unit 2, when the raw fuel gas is a natural gas-based city gas (13A) containing methane gas as a main component, for example, 600 by the catalytic action of a reforming reaction catalyst such as ruthenium, nickel, or platinum. Under a reforming treatment temperature in a range of ˜750 ° C., methane gas and water vapor are reformed to generate a reforming treatment gas containing hydrogen gas as a main component.
In the shift section 5, the reforming process supplied from the reforming section 23 under a shift processing temperature in the range of 150 to 400 ° C., for example, by the catalytic action of an iron oxide-based or copper-zinc-based shift reaction catalyst. The carbon monoxide gas in the gas is transformed into carbon dioxide gas using water vapor.
In the selective oxidation section 6, the catalytic treatment of a noble metal-based selective oxidation catalyst such as platinum, ruthenium, rhodium or the like is performed in the reforming treatment gas after the shift treatment at a selective oxidation treatment temperature of 80 to 150 ° C. The carbon monoxide gas remaining in the gas is selectively oxidized.

An off-gas passage 10 for guiding exhaust fuel gas discharged from the fuel electrode of each cell of the fuel cell G is connected to the reforming burner 3 so that the exhaust fuel gas is supplied to the reforming burner 3 as a combustion fuel. It is configured.
Further, a battery bypass circuit 11 is provided for connecting the fuel gas supply path 7 and the off gas path 10 so as to bypass the fuel cell G.
A battery upstream side on-off valve V3 is provided at a location downstream of the connection location of the battery bypass circuit 11 in the fuel gas supply path 7, and upstream of the connection location of the battery bypass circuit 11 in the off gas channel 10. Is provided with a battery downstream side on-off valve V4, and the battery bypass circuit 11 is provided with a battery bypass circuit open / close valve V5.

  That is, the fuel gas supply path 7 and the off-gas path 10 constitute the normal flow path Ru, and a portion of the fuel gas supply path 7 upstream of the connection place of the battery bypass circuit 11, the battery bypass. The battery bypass flow path Rb is configured at a portion of the path 11 and the off-gas path 10 downstream of the connection location of the battery bypass path 11.

Then, by opening the battery upstream side open / close valve V3 and the battery downstream side open / close valve V4 and closing the battery bypass circuit open / close valve V5, the normal flow path Ru is made to flow. By switching to the normal flow state, closing the battery upstream side open / close valve V3 and the battery downstream side open / close valve V4, and opening the battery bypass circuit open / close valve V5, the battery bypass flow path The normal flow is switched by switching to the battery detour flow state for passing Rb and opening the battery upstream side open / close valve V3, the battery downstream side open / close valve V4, and the battery bypass circuit open / close valve V5. It is switched to a parallel flow state in which both the route Ru and the battery bypass flow route Rb are in a flow state.
That is, the flow path switching unit S is configured by the battery upstream side open / close valve V3, the battery downstream side open / close valve V4, and the battery bypass circuit open / close valve V5.

The reforming burner 3 is connected to a combustion raw fuel supply passage 12 for supplying raw fuel gas as combustion fuel, and a combustion air supply passage 14 for sending combustion air from a combustion blower 13. The combustion raw fuel supply passage 12 has a combustion raw fuel intermittent valve V6 for intermittently supplying the raw fuel gas for combustion to the reforming burner 3, and a combustion for the reforming burner 3. A raw fuel control valve V7 for combustion is provided for adjusting the supply amount of the raw fuel gas.
Further, an igniter 15 for igniting the reforming burner 3 is provided, and furthermore, the temperature of the combustion chamber 16 in which combustion fuel is burned by the reforming burner 3 (hereinafter sometimes referred to as combustion chamber temperature). A combustion temperature sensor Tb to detect, and a reforming temperature sensor Tr to detect the temperature of the reforming unit 2 heated in the combustion chamber 16 (hereinafter may be referred to as the reforming unit temperature) are provided. Yes.

  The steam generation section B includes a combustion exhaust gas flow section 19h through which the combustion exhaust gas of the reforming burner 3 is supplied from the combustion chamber 16 through the combustion exhaust gas passage 18, and a reforming water supplied to the combustion exhaust gas flow section 19h. An evaporator 19 provided with an evaporation processing section 19b that evaporates by heating, a reforming water tank 20 that stores reforming water, and reforming water supplied from the reforming water tank 20 A reforming water pump 22 for supplying to the evaporation processing section 19b of the evaporator 19 through the passage 21 is provided.

  In the reforming water supply path 21, a water treatment unit 23 that purifies the reforming water into pure water, and the reforming water purified to pure water in the water treatment unit 23 flows through the fuel gas supply path 7. The first stage preheater 24 that preheats by exchanging heat with the fuel gas to be heated, and the gas treatment that further connects the reforming water preheated in the first stage preheater 24 to the shift unit 5 and the selective oxidation unit 6 A second-stage preheater 25 that preheats by heat exchange with the reforming gas flowing through the flow path 9 is provided in order from the upstream side.

The battery bypass circuit 11 is provided with a battery bypass drain trap 26 that separates condensed water from the gas flowing therethrough, and the 2 in the gas processing flow path 9 that connects the shift unit 5 and the selective oxidation unit 6. At a location downstream of the stage preheater 25, a metamorphic portion downstream drain trap 27 for separating condensed water from flowing gas is provided.
Then, the condensed water separated by the battery bypass drain trap 26 and the condensed water separated by the downstream downstream drain trap 27 are supplied to the reforming water tank 20 through the condensed water recovery path 28. It is configured to be.
Although not shown, it is included in the condensed water obtained by condensing water vapor contained in the exhaust air exhausted from the oxygen electrode of the fuel cell G, or in the combustion exhaust gas discharged from the combustion exhaust gas passage portion 19h of the evaporator 19. The condensed water obtained by condensing the water vapor is also supplied to the reforming water tank 20.
That is, the condensate collected from the reforming gas, fuel gas, exhaust air, combustion exhaust gas, etc. is stored in the reforming water tank 20, and the stored condensate is used as the reforming water. ing.

  A drainage channel 29 is connected to the condensed water recovery channel 28, and a drainage on-off valve 30 is provided in the drainage channel 29. By opening the drainage on-off valve 30, the battery bypass circuit is provided. The condensed water separated by the drain trap 26 and the condensed water separated by the downstream-side drain trap 27 of the shift unit can be discarded without being collected in the reforming water tank 20. Yes.

  An ejector 31 is provided in the gas processing channel 9 connecting the desulfurization unit 1 and the reforming unit 2, and a steam supply channel 32 that sends out the steam generated in the evaporation processing unit 19 b of the evaporator 19 is provided. The raw fuel gas connected to the ejector 31 and mixed with the raw fuel gas desulfurized in the desulfurization section 1 is mixed with the steam in the ejector 31 so that the raw fuel in the steam mixed state is supplied to the reforming section 2. It is configured.

When the fuel cell power generator configured as described above is shipped from a manufacturer, nitrogen gas is supplied through the power generation raw fuel supply path 8 so that the fuel gas generator P and the fuel cell G are filled with nitrogen gas. In this state, the power generation raw fuel intermittent valve V1, the battery downstream side open / close valve V4, and the battery bypass circuit open / close valve V5 are closed, and nitrogen gas is supplied to the fuel gas generation unit P and the fuel cell G. The fuel gas generation unit P and the fuel cell G are installed in a state in which the user fills nitrogen gas.
Incidentally, the state in which the fuel gas generating part P and the fuel cell G are filled with nitrogen gas means that the desulfurization part 1, the reforming part 2, the shifter 5, the selective oxidation part 6, and the above are connected. A gas processing flow path 9, the fuel gas supply path 7, a flow path for supplying fuel gas to the fuel electrode of each cell in the fuel cell G, and a portion of the off gas path 10 upstream of the battery downstream on-off valve V4 In addition, the battery bypass circuit 11 is filled with nitrogen gas in a portion upstream of the battery bypass circuit on-off valve V5.

Next, an operation method of the fuel cell power generator will be described.
At the time of stoppage, combustion of the reforming burner 3 is stopped, and the raw fuel supply section K is stopped until the temperature of the reforming section 2 falls to a temperature at which the raw fuel gas can be prevented from thermal decomposition and water vapor condensation can be prevented. Among the supply of raw fuel gas and the supply of water vapor by the steam generation unit B, at least the supply of water vapor by the steam generation unit B can be continued, and the temperature of the reforming unit 2 can prevent thermal decomposition of the raw fuel gas; When the temperature drops to a temperature at which condensation of water vapor can be prevented, the supply of water vapor by the water vapor generation unit B is stopped and the raw fuel gas is supplied by the raw fuel supply unit K, so that the fuel gas generation unit P and the fuel cell G The process at the time of stopping is filled with raw fuel gas.

  At the time of start-up, combustion of the reforming burner 3 is started, and when the temperature of the reforming unit 2 is raised to a temperature at which raw fuel gas can be prevented from thermal decomposition and water vapor condensation can be prevented, the steam generating unit B The supply of water vapor is started, the raw fuel gas filled in the fuel gas generation part P and the fuel cell G is replaced with water vapor, and the temperature of the reforming part 2 becomes a temperature at which reforming treatment is possible. When the temperature rises, a start-up process for starting supply of raw fuel by the raw fuel supply unit K is performed.

In the present invention, in the state where the fuel gas generation unit P and the fuel cell G are filled with nitrogen gas, the normal flow path Ru and the battery bypass flow are performed before the start-up process is performed. The raw fuel gas is supplied by the raw fuel supply unit K in a state where both of the paths Rb are switched to the flowing state, and the nitrogen gas filled in the fuel gas generation unit P and the fuel cell G is supplied as the raw fuel. An initial replacement process for replacing with gas is performed.
Further, when the raw fuel gas replaced with the nitrogen gas filled in the fuel gas generating part P and the fuel cell G is combusted in the reforming burner 3, the initial replacement process is terminated.

In the first embodiment, the operation control unit C is configured to execute the above-described operation method.
Hereinafter, the control operation of the operation control unit C will be described.
Incidentally, when the fuel cell power generation device is operated by the operation control unit C in a predetermined operation time zone of one day, the operation control unit C is based on the start time of the operation time zone. It is determined that the start timing is reached, and the stop timing is determined based on the end time of the operation time zone.

A test operation command switch 17 for instructing the operation control unit C to perform a test operation is provided.
Then, before starting the operation of the fuel cell power generation device for the first time after installing this fuel cell power generation device, the installation operator operates the test operation command switch 17 so as to instruct a test operation.
Incidentally, when the fuel cell power generator is installed, as described above, the battery upstream side open / close valve V3 is in an open state, and the power generation raw fuel intermittent valve V1, the battery downstream side open / close valve V4, and the In the state where the battery bypass circuit opening / closing valve V5 is closed, the fuel gas generation part P and the fuel cell G are filled with nitrogen gas.

  When the test operation is instructed by the test operation command switch 17, the operation control unit C maintains the open state of the battery upstream side open / close valve V3 while maintaining the battery downstream side open / close valve V4 and the battery bypass circuit open / close valve. By opening V5, the flow rate switching unit S is switched to the parallel flow state, the igniter 15 is operated, and the set air ratio with respect to the set raw fuel supply amount for initial replacement is set. In the state where the combustion blower 13 is operated at a rotational speed at which a certain amount of combustion air is supplied and the reforming burner 3 is combustable when the combustion gas is supplied, the raw fuel for power generation is interrupted. The power generation raw fuel control valve V2 is operated so that the valve V1 is opened and the fuel gas supply amount becomes the set raw fuel supply amount for the initial replacement, and the raw fuel gas is supplied by the raw fuel supply unit K. Supply and then said When the combustion chamber temperature detected by the firing temperature sensor Tb reaches the raw fuel purge end set temperature, the power generation raw fuel intermittent valve V1, the battery downstream side open / close valve V4, and the battery bypass circuit open / close valve V5 are closed. Then, by stopping the combustion blower 13, an initial replacement process is performed to replace the nitrogen gas filled in the fuel gas generation unit P and the fuel cell G with raw fuel gas. .

Incidentally, the raw fuel purge end set temperature is set to a combustion chamber temperature in a state in which the reforming burner 3 is combusting, and the initial replacement set raw fuel supply amount is set to the fuel gas generation unit P. In addition, the flow rate is set so that the nitrogen gas filled in the fuel cell G can be surely pushed away.
In the initial replacement process, the igniter 15 is operated and the combustion blower 13 is operated so that the reforming burner 3 is combustible when supplied with combustion gas. When the nitrogen gas filled in the gas generator P and the fuel cell G is swept away by the raw fuel gas and discharged from the reforming burner 3, and the raw fuel gas is supplied to the reforming burner 3, the reforming burner 3 combusts, the combustion chamber temperature detected by the combustion temperature sensor Tb rises to the raw fuel purge end set temperature, and the initial replacement process ends.
That is, when the operation control unit C enters a state in which the raw fuel gas replaced with the nitrogen gas charged in the fuel gas generation unit P and the fuel cell G burns in the reforming burner 3, The replacement process is configured to end.

  As will be described in detail later, when the fuel cell power generator is stopped, the stop time process is executed, and the power generation raw fuel interrupt valve V1, the battery downstream side open / close valve V4, and the battery bypass circuit open / close valve V5 are closed. In addition, the fuel gas generation unit P and the fuel cell G are filled with raw fuel gas in a state where the battery upstream side opening / closing valve V3 is opened.

  The operation control unit C executes combustion start control for starting combustion of the reforming burner 3 at the start timing, and subsequently, the reforming unit temperature detected by the reforming temperature sensor Tr is a steam purge. When the starting set temperature is reached, steam supply control is performed in which supply of water vapor by the water vapor generation unit B is started and the raw fuel gas filled in the fuel gas generation unit P and the fuel cell G is replaced with water vapor. Next, when the reforming section temperature detected by the reforming temperature sensor Tr reaches the raw fuel supply start set temperature, the flow path switching section S is switched to the battery bypass flow state, When the raw fuel supply start control for starting the supply of the raw fuel gas by the raw fuel supply unit K is executed, and then the detour processing set time elapses after the supply of the raw fuel gas is started, the flow path switching unit Normal flow through S Switched, it is configured to perform a startup process for executing the fuel fuel gas supply start control for starting the supply of the battery G of the fuel gas generated in the fuel gas generator P.

In the combustion start control, the operation control unit C opens the combustion raw fuel on-off valve V6 in a state where the igniter 15 is operated, and the combustion control unit C opens the combustion so that the set raw fuel supply amount for starting is reached. By adjusting the raw fuel control valve V7 and adjusting the rotational speed of the combustion blower 13 so as to supply combustion air in an amount corresponding to the set air ratio with respect to the set raw fuel supply amount for startup, The combustion of the reforming burner 3 is started.
In the water vapor replacement control, the operation control unit C opens the battery downstream side open / close valve V4 and the battery bypass circuit open / close valve V5 to switch the flow path switching unit S to the parallel flow state. At the same time, the reforming water pump 22 is operated to start supply of water vapor by the water vapor generation unit B, and the raw fuel gas filled in the fuel gas generation unit P and the fuel cell G is converted into water vapor. Are configured to replace.
In the raw fuel supply start control, the operation control unit C closes the battery upstream side open / close valve V3 and the battery downstream side open / close valve V4, thereby allowing the flow path switching unit S to bypass the battery. The supply of raw fuel gas by the raw fuel supply unit K is started by switching to the state and opening the power generation raw fuel intermittent valve V1.
In the fuel gas supply start control, the operation control unit C opens the battery upstream side open / close valve V3 and the battery downstream side open / close valve V4, and closes the battery bypass circuit open / close valve V5. Thus, the flow path switching unit S is switched to the normal flow state, and the supply of the fuel gas generated by the fuel gas generation unit P to the fuel cell G is started.

The steam purge start set temperature is set to a temperature at which raw fuel gas can be prevented from thermal decomposition and steam can be prevented from condensing, for example, 220 to 250 ° C., and the raw fuel supply start set temperature is The temperature at which the fuel gas can be reformed, for example, 600 ° C. is set.
Further, the detour processing set time is such that after the start of the supply of the raw fuel gas, the processing in each of the desulfurization unit 1, the reforming unit 2, the shift unit 5 and the selective oxidation unit 6 becomes normal, and the fuel gas generation unit P The time required for the production of the fuel gas to become normal is set to 2 to 10 minutes, for example.

  The operation control unit C is configured to adjust the supply amount of the raw fuel gas so as to adjust the generated power of the fuel cell G according to an electric load during normal operation in which the fuel cell G generates power. The raw water control valve V2 is controlled, and the supply amount of reforming water is set so as to be a preset S / C (ratio of the steam supply amount to the raw fuel gas supply amount to the reforming unit 2). The generated power adjustment control for controlling the rotation speed of the reforming water pump 22 to be adjusted, and the temperature detected by the reforming temperature sensor Tr is set to the set temperature for reforming treatment (for example, 600 to 750 ° C.). The reforming temperature control that adjusts the rotation speed of the combustion blower 13 so as to adjust the raw fuel control valve V7 for combustion and to supply the reforming burner 3 with an amount of combustion air having a set air ratio. Configured to perform normal operation processing in parallel It has been. Note that S / C is set to, for example, about 2.8 by the ratio of the amount of water vapor supply (number of moles) to the amount of raw fuel gas supplied (number of moles of carbon) to the reforming unit 2.

Incidentally, the fuel utilization rate in the fuel cell G is set in advance, and the off-gas supplied to the reforming burner 3 based on the control information of the power generation raw fuel control valve V2 and the combustion raw fuel control valve V7 The amount of combustion fuel combined with the raw fuel gas can be obtained.
Therefore, the operation control unit C obtains the current amount of combustion fuel supplied to the reforming burner 3 (a total amount of off-gas and raw fuel gas) and sets it for the obtained amount of combustion fuel supplied. The rotational speed of the combustion blower 13 is adjusted so as to supply combustion air in an amount corresponding to the air ratio.

  The operation control unit C executes combustion stop control for stopping combustion of the reforming burner 3 at the stop timing, and subsequently, the reforming unit temperature detected by the reforming temperature sensor Tr is the raw fuel. Until the temperature is lowered to the purge start set temperature, the temperature decrease standby control is performed in which the supply of the raw fuel gas by the raw fuel supply unit K is stopped and the supply of the water vapor by the water vapor generation unit B is continued. When the reforming part temperature detected by the reforming temperature sensor Tr falls to the raw fuel purge start set temperature, the supply of water vapor by the steam generation part B is stopped and the raw fuel gas is supplied by the raw fuel supply part K. The fuel gas generator P and the fuel cell G are supplied to perform raw fuel gas filling control for filling raw fuel, and a stop time process is executed.

In the combustion stop control, the operation control unit C opens the battery bypass open / close valve V5 while maintaining the open state of the battery upstream open / close valve V3 and the battery downstream open / close valve V4. By switching the flow path switching unit S to a parallel flow state and continuing the operation of the reforming water pump 22, the steam generation unit B continues to supply the steam, By closing the raw fuel intermittent valve V1 and the combustion raw fuel intermittent valve V6 and stopping the combustion blower 13, the supply of raw fuel gas by the raw fuel supply unit K is stopped, and The combustion of the reforming burner 3 is stopped.
In the temperature decrease standby control, the operation control unit C continues the parallel flow state of the flow path switching unit S from the previous combustion stop control, and operates the reforming water pump 22 and the power generation source. By continuing the closed state of the fuel intermittent valve V1, the supply of water vapor by the water vapor generation unit B is continued in a state where the supply of the raw fuel gas by the raw fuel supply unit K is stopped.
In the raw fuel gas charging control, the operation control unit C stops the reforming water pump 22 while continuing the parallel flow state of the flow path switching unit S from the previous temperature decrease standby control, and By opening the raw fuel intermittent valve V1 for power generation, the supply of water vapor by the water vapor generation part B is stopped and the raw fuel gas is supplied by the raw fuel supply part K. Subsequently, the set time for purging the raw fuel Is passed, the fuel gas generation section P and the fuel cell G are supplied with the raw fuel gas by closing the power generation raw fuel intermittent valve V1, the battery downstream side open / close valve V4, and the battery bypass circuit open / close valve V5. Is configured to be filled.

  The set temperature for starting the raw fuel purge is set to a temperature at which the raw fuel gas can be prevented from being thermally decomposed and water vapor can be prevented from condensing, for example, 400 ° C. The set time for the raw fuel purge is set to After the fuel intermittent valve V1 is opened and the supply of the raw fuel gas is started, the water vapor filled in the fuel gas generator P and the fuel cell G is pushed out of the reformer burner 3 by the raw fuel gas, The time required for the gas to reach the reforming burner 3 or a time slightly longer than that time is set.

Next, the control operation of the operation control unit C will be described based on the flowcharts shown in FIGS.
As shown in FIG. 2, when the initial replacement process has not been executed, the operation control unit C executes the initial replacement process when the trial operation is instructed by the trial operation command switch 17, and the initial replacement process has been executed. In this case, the start-up process is executed at the start timing, the normal operation process is executed at the end of the start-up process, and the stop-time process is executed at the stop timing (steps # 1 to # 8).

  As shown in FIG. 3, in the initial replacement process, the operation control unit C switches the flow path switching unit S to a parallel flow state, operates the igniter 15, and supplies the set raw fuel for the initial replacement. The combustion blower 13 is operated at a rotational speed that supplies combustion air in an amount corresponding to the set air ratio with respect to the amount, and the reforming burner 3 is combusted when supplied with combustion gas, Subsequently, the power generation raw fuel intermittent valve V1 is opened, and the power generation raw fuel control valve V2 is operated so that the fuel gas supply amount becomes the initial replacement set raw fuel supply amount. When the combustion chamber temperature detected by the combustion temperature sensor Tb reaches the raw fuel purge end set temperature, the power generation raw fuel intermittent valve V1, the battery downstream side open / close valve V4, and the battery bypass circuit open / close valve V5 is closed and the fuel is The use blower 13 is stopped (Step # 31 to 35).

  As shown in FIG. 4, in the start-up process, the operation control unit C opens the combustion raw fuel on-off valve V6 in a state where the igniter 15 is operated, so that the set raw fuel for start-up is set. The combustion raw fuel control valve V7 is adjusted so as to be the supply amount, and the combustion blower 13 of the combustion blower 13 is supplied so as to supply an amount of combustion air that has a set air ratio with respect to the set raw fuel supply amount for startup. By adjusting the rotation speed, combustion of the reforming burner 3 is started (step # 51). Subsequently, the reforming section temperature detected by the reforming temperature sensor Tr is set to the steam purge starting set temperature. Then, the flow path switching unit S is switched to the parallel flow state, and the reforming water pump 22 is operated (steps 52 and 53).

  Subsequently, when the reforming section temperature detected by the reforming temperature sensor Tr reaches the raw fuel supply start set temperature, the flow path switching section S is switched to the battery bypass flow state and the power generating raw fuel By opening the intermittent valve V1, the supply of the raw fuel gas by the raw fuel supply unit K is started (steps # 54 and 55), and then, after the start of the supply of the raw fuel gas, the detour processing set time When the time elapses, the flow path switching unit S is switched to the normal flow state (steps # 56 and 57).

As shown in FIG. 5, the operation control unit C switches the flow path switching unit S to a parallel flow state and continues the operation of the reforming water pump 22 in the stop time process. In the state where the supply of steam by the steam generation unit B is continued by closing the power generation raw fuel intermittent valve V1 and the combustion raw fuel intermittent valve V6 and stopping the combustion blower 13. The supply of the raw fuel gas by the raw fuel supply unit K is stopped and the combustion of the reforming burner 3 is stopped (step # 81).
Subsequently, when the reforming section temperature detected by the reforming temperature sensor Tr falls to the raw fuel purge start set temperature, the reforming water pump 22 is stopped and the power generation raw fuel intermittent valve V1 is opened. By stopping the supply of water vapor by the water vapor generation unit B and supplying the raw fuel gas by the raw fuel supply unit K (steps # 82 and 83), and then, after starting the supply of the raw fuel gas, When the raw fuel purge set time has elapsed, the power generation raw fuel intermittent valve V1, the battery downstream side open / close valve V4, and the battery bypass circuit open / close valve V5 are closed (steps # 84 and 85).

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described. This second embodiment will explain another embodiment of the operation method of the fuel cell power generator, and the configuration of the fuel cell power generator will be described above. Since it is the same as that of 1st Embodiment, the description about the structure of a fuel cell power generator is abbreviate | omitted, and the driving | running method of a fuel cell power generator is mainly demonstrated.
In the second embodiment, another embodiment of the initial replacement process is described in the operation method of the fuel cell power generation apparatus. The operation method other than the initial replacement process is the same as that of the first embodiment. Therefore, the initial replacement process will be mainly described.

  In the second embodiment, in the state in which the fuel gas generation unit P and the fuel cell G are filled with nitrogen gas, the battery bypass flow path Rb flows before the start-up process is performed. The raw fuel gas is supplied by the raw fuel supply means K, and the nitrogen gas filled in the fuel gas generation part P is replaced with the raw fuel gas. Subsequently, the normal flow path The raw fuel gas is supplied by the raw fuel supply unit K in a state where both Ru and the battery bypass flow path Rb are switched to the flowing state, and the nitrogen gas filled in the fuel cell G is supplied to the raw fuel. An initial replacement process for replacing with gas is performed.

And also in this 2nd Embodiment, it is comprised so that the said driving | operation control part C may perform the above-mentioned driving | running method.
Hereinafter, the control operation of the operation control unit C in the initial replacement process will be described.
When a test operation is instructed by the test operation command switch 17, the operation control unit C closes the battery upstream side open / close valve V3 and the battery downstream side open / close valve V4 and opens the battery bypass circuit open / close valve V5. As a result, the flow rate switching unit S is switched to the battery bypass flow state, the igniter 15 is operated, and the amount of the set air ratio becomes the set raw fuel supply amount for the initial replacement. The combustion blower 13 is operated at a rotational speed for supplying combustion air, and the reforming burner 3 is combusted when supplied with combustion gas. The raw fuel supply unit K supplies the raw fuel gas by opening the valve V1 and operating the power generation raw fuel control valve V2 so that the supply amount of the fuel gas becomes the set raw fuel supply amount for the initial replacement. And the raw fuel gas When the initial purge set time has elapsed after the start of supply, the battery upstream side open / close valve V3 and the battery downstream side open / close valve V4 are opened and the battery bypass circuit open / close valve V5 is closed, thereby When the switching unit S is switched to the normal flow state, and the combustion chamber temperature detected by the combustion temperature sensor Tb reaches the raw fuel purge end set temperature, the power generation raw fuel intermittent valve V1, the downstream of the battery The side opening / closing valve V4 and the battery bypass circuit opening / closing valve V5 are closed, and the combustion blower 13 is stopped, so that the nitrogen gas filled in the fuel gas generator P and the fuel cell G is converted into the raw fuel gas. An initial replacement process for replacement is executed.

  Incidentally, the setting time for the initial purge is that the nitrogen gas filled in the fuel gas generation part P is caused by the raw fuel gas after opening the power generation raw fuel intermittent valve V1 and starting the supply of the raw fuel gas. The time required to be swept away by the battery bypass 11 or a time slightly longer than that time is set.

Next, a control operation of the operation control unit C in the initial replacement process will be described based on the flowchart shown in FIG.
In the initial replacement process, the operation control unit C switches the flow path switching unit S to a battery bypass flow state, operates the igniter 15 and operates the combustion blower 13, and performs the reforming. When the combustion gas is supplied to the burner 3, the burner 3 is brought into a combustible state, the power generation raw fuel intermittent valve V <b> 1 is opened, and the fuel gas supply amount is set to the initial replacement set raw fuel supply. The power generation raw fuel control valve V2 is actuated so as to reach the amount, and the supply of the raw fuel gas is started (steps # 31a and 32a).
Subsequently, when the initial purge setting time has elapsed after the start of the supply of the raw fuel gas, the flow path switching unit S is switched to the normal flow state (steps # 33a and 34a).
Incidentally, the setting time for the initial purge is that the nitrogen gas filled in the fuel gas generation part P is caused by the raw fuel gas after opening the power generation raw fuel intermittent valve V1 and starting the supply of the raw fuel gas. The time required to be swept away by the battery bypass 11 or a time slightly longer than that time is set.
As described above, when the initial purge setting time has elapsed after the start of the supply of the raw fuel gas, the nitrogen gas filled in the fuel gas generation unit P is replaced with the raw fuel gas.

Subsequently, when the combustion chamber temperature detected by the combustion temperature sensor Tb reaches the raw fuel purge end set temperature, the power generation raw fuel intermittent valve V1, the battery downstream side on-off valve V4, and the battery bypass circuit on-off valve V5 is closed, and then the combustion blower 13 is stopped (steps # 35a to 37a).
Thus, when the combustion chamber temperature detected by the combustion temperature sensor Tb reaches the set temperature for ending the raw fuel purge, the nitrogen gas filled in the fuel cell G is replaced with the raw fuel gas, and the fuel gas The generation unit P and the fuel cell G are filled with the raw fuel gas.

[Third Embodiment]
Hereinafter, a third embodiment of the present invention will be described. This third embodiment will explain another embodiment of the operation method of the fuel cell power generator, and the configuration of the fuel cell power generator is a test operation command switch. Since it is the same as that of said 1st Embodiment except having omitted 17, the description about the structure of a fuel cell power generator is abbreviate | omitted, and the operating method of a fuel cell power generator is mainly demonstrated.
And in this 3rd Embodiment, since another embodiment of the process at the time of starting is demonstrated in the operating method of a fuel cell power generation device, the process at the time of starting is mainly demonstrated.
Incidentally, in the third embodiment, the initial replacement process performed in the first embodiment is not performed.

  In the third embodiment, similarly to the first embodiment, at the time of start-up, combustion of the reforming burner 3 is started, and the temperature of the reforming unit 2 can prevent thermal decomposition of the raw fuel gas and When the temperature is raised to a temperature at which condensation of water vapor can be prevented, supply of water vapor by the water vapor generation part B is started, and the raw fuel gas filled in the fuel gas generation part P and the fuel cell G is replaced with water vapor. When the temperature of the reforming unit 2 is raised to a temperature at which reforming can be performed, a start-up process for starting the supply of the raw fuel gas by the raw fuel supply unit K is performed.

  In the start-up process, when the fuel gas generation unit P and the fuel cell G are filled with nitrogen gas, the supply of raw fuel gas by the raw fuel supply unit K is started, and then the detour for nitrogen is performed. Until the set time for processing elapses, the battery bypass flow path Rb is switched to the flow-through state, and when the set time for detour processing for nitrogen elapses, the normal flow path Ru is switched to the flow-through state. When the fuel gas generation unit P and the fuel cell G are filled with the raw fuel gas, the supply of the raw fuel gas by the raw fuel supply unit K is started, and then the detour processing for nitrogen is performed. Until the detour processing set time for raw fuel shorter than the set time elapses, the battery detour flow path Rb is switched to the flow through state, and when the raw fuel detour processing set time elapses. Normal flow Switching the road Ru in flowing state.

And also in this 3rd Embodiment, it is comprised so that the said operation method may be performed by the said operation control part C. FIG.
Hereinafter, the control operation of the operation control unit C in the startup process will be described.
When this fuel cell power generator is installed, the power generation raw fuel intermittent valve V1, the battery downstream side on-off valve V4, and the battery bypass circuit on-off valve V5 are closed, and the battery upstream side on-off valve V3. Is opened, the fuel gas generator P and the fuel cell G are filled with nitrogen gas.
And the said operation control part C is comprised so that it may perform the process at the time of the first start, if it becomes the first start timing after a fuel cell power generator is installed.
When this first startup process is executed and the fuel cell power generator is operated, the stop process is executed when the fuel cell power generator is stopped. Therefore, at the second and subsequent startup timings, the power generation raw fuel intermittent valve V1 is used. The fuel gas generating part P and the fuel cell G are opened with the battery downstream side open / close valve V4 and the battery bypass open / close valve V5 closed and the battery upstream side open / close valve V3 opened. The raw fuel gas is filled.
And the said operation control part C is comprised so that it may perform a normal process at the time of the starting timing after the 2nd time.

Hereinafter, the first startup process and the normal startup process will be described.
In the initial startup process, the operation control unit C opens the drainage on-off valve 30 and subsequently executes combustion start control for starting the combustion of the reforming burner 3. When the reforming section temperature detected by the temperature sensor Tr reaches the steam purge start set temperature, the steam generation section B starts supplying steam and fills the fuel gas generation section P and the fuel cell G. The steam replacement control for replacing the raw fuel gas that has been performed with water vapor is executed, and when the reformer temperature detected by the reforming temperature sensor Tr reaches the raw fuel supply start set temperature, The raw fuel supply start control for starting the supply of raw fuel gas by the raw fuel supply unit K is executed in a state where the path switching unit S is switched to the battery bypass flow state, and then the supply of the raw fuel gas is started. After, set time for detour processing for nitrogen After the passage, the flow path switching unit S is switched to the normal flow state, and fuel gas supply start control for starting the supply of the fuel gas generated by the fuel gas generation unit P to the fuel cell G is executed. Subsequently, the drainage on-off valve 30 is closed.

During this initial startup process, the drain on-off valve 30 is opened and the condensed water is discarded without being collected in the reforming water tank 20, so that ammonia is dissolved. It is possible to avoid the condensate that may be collected in the reforming water tank 20.
And since it can suppress that the ion load of the water treatment part 23 becomes large by avoiding that the condensed water in which ammonia may melt | dissolve is collect | recovered by the reforming water tank 20, water The life of the processing unit 23 can be extended.

  In the normal start-up process, the operation control unit C performs combustion start control for starting combustion of the reforming burner 3, and subsequently the reforming unit temperature detected by the reforming temperature sensor Tr is detected. When the set temperature for starting the steam purge is reached, steam supply is started by the steam generation part B, and the raw fuel gas filled in the fuel gas generation part P and the fuel cell G is replaced with steam. When the reforming section temperature detected by the reforming temperature sensor Tr reaches the raw fuel supply start set temperature, the flow path switching section S is switched to the battery bypass flow state. Then, the raw fuel supply start control for starting the supply of the raw fuel gas by the raw fuel supply unit K is executed, and then, after the start of the supply of the raw fuel gas, the detour processing set time for the raw fuel elapses. The flow path switching unit S is usually used By switching the flow state, executing the fuel fuel gas supply start control for starting the supply of the battery G of the fuel gas generated in the fuel gas generator P.

  The control operations of the operation control unit C of the combustion start control, the steam replacement control, the raw fuel supply start control, and the fuel gas supply start control in the initial start-up process and the normal start-up process are the same as those in the first embodiment. Since it is the same, description is abbreviate | omitted.

  In the third embodiment, the setting time for the bypass processing for the raw fuel is set, for example, in a range of 2 to 10 minutes, and the setting time for the bypass processing for the nitrogen is set for the bypass processing for the raw fuel. It is set to 1.5 times the set time, for example, in the range of 3 to 15 minutes.

Next, the control operation of the operation control unit C will be described based on the flowcharts shown in FIGS.
As shown in FIG. 7, when the start timing comes, the operation control unit C determines whether or not the start timing is the first start timing, and if it is the first start timing, executes the first start-up process. And, if it is the second and subsequent startup timing, the normal startup process is executed, and when the first startup process or the normal startup process is completed, the normal operation process is executed, and when the stop timing is reached, The stop process is executed (steps # 101 to 107).

As shown in FIG. 8, the flowchart for the initial startup process is that step # 50 for closing the drain opening / closing valve 30 is added, and the processing of step # 56 is the setting time for bypass processing for nitrogen. The flow chart is the same as that shown in FIG. 4 described in the first embodiment except that it is determined whether or not it has elapsed and step # 58 for closing the drainage on-off valve 30 is added. Therefore, explanation is omitted.
The flowchart for the normal startup process is the same as that in the first embodiment except that the process of step # 56 is different in that it is determined whether or not the detour processing set time for raw fuel has elapsed. Since it is the same as the flowchart shown in FIG. 4 described, illustration and description are omitted.

[Another embodiment]
Next, another embodiment will be described.
(A) In the first embodiment, in the initial replacement process, the raw fuel supply unit K performs the raw fuel supply in a state where both the normal flow path Ru and the battery bypass flow path Rb are switched to the flow state. Although the case where fuel gas is supplied has been exemplified, the raw fuel gas may be supplied by the raw fuel supply unit K in a state where the normal flow path Ru is switched to the flow state.
In the second embodiment, in the initial replacement process, the raw fuel gas is supplied by the raw fuel supply means K while the battery bypass flow path Rb is switched to the flow state, and the fuel gas is supplied. Nitrogen gas filled in the generation part P is replaced with raw fuel gas, and then the raw fuel is changed in a state where both the normal flow path Ru and the battery bypass flow path Rb are switched to the flow state. Although the case where the raw fuel gas is supplied by the supply unit K is illustrated, the raw fuel gas is supplied by the raw fuel supply means K in the state where the battery bypass flow path Rb is switched to the flow state, and the fuel is supplied. Nitrogen gas filled in the gas generating unit P is replaced with raw fuel gas, and then the raw fuel gas is supplied by the raw fuel supply unit K in a state where the normal flow path Ru is switched to the flow state. You may make it do.

(B) In each of the first and second embodiments, the end of the initial replacement process is determined based on the fact that the combustion chamber temperature detected by the combustion temperature sensor Tb becomes the raw fuel purge end set temperature. However, the accumulated supply amount of the raw fuel gas after the start of the initial replacement process is determined based on the fact that the elapsed time after the start of the initial replacement process becomes the set time for the end of the raw fuel purge. It may be configured to perform based on the set supply amount for the end of the raw fuel purge.
The set time for the end of the raw fuel purge and the set supply amount for the end of the raw fuel purge are determined after the start of the supply of the raw fuel gas by the raw fuel supply unit K, and then the fuel gas generation unit P and the fuel It is set corresponding to the state in which the nitrogen gas filled in the battery G is swept away by the raw fuel gas and discharged from the reforming burner 3, and the raw fuel gas is supplied to the reforming burner 3.
In other words, when the raw fuel gas replaced with the nitrogen gas filled in the fuel gas generation part P and the fuel cell G is burned in the reforming burner 3, the initial replacement process is terminated.

(C) In each of the first and second embodiments described above, the case where the operation control unit C is caused to execute the initial replacement process by the command from the test operation command switch 17 is illustrated, but when the first activation timing is reached In addition, the operation control unit C may be configured to automatically execute the initial replacement process before executing the startup process.

(D) In each of the first to third embodiments, in the stop process, until the temperature of the reforming unit 2 falls to a temperature at which the raw fuel gas can be prevented from thermal decomposition and water vapor can be prevented from condensing. Although illustrated about the case where the supply of water vapor by the water vapor generation unit B is continued, it is configured to continue both the supply of raw fuel gas by the raw fuel supply unit K and the supply of water vapor by the water vapor generation unit B. Also good.
When the operation control unit C is to execute the stop process, in the combustion stop control in the stop process, the open state of the power generation raw fuel intermittent valve V1 is continued, and in the temperature decrease standby control, the power generation from the previous combustion stop control is performed. By continuing the open state of the raw fuel intermittent valve V1, the raw fuel supply section K performs the raw fuel supply until the reforming section temperature detected by the reforming temperature sensor Tr falls to the raw fuel purge starting set temperature. Both the supply of fuel gas and the supply of water vapor by the water vapor generation unit B are continued.

(E) A specific setting example of the detour processing setting time for nitrogen is limited to a case where the setting time is set to 1.5 times the setting time for detour processing for raw fuel exemplified in the third embodiment. It can be changed under the condition that it is longer than the set time for the bypass processing for raw fuel. However, if it is too short, the nitrogen gas may not be discharged reliably. If it is too long, the raw fuel gas will be wasted, so that it is about 1.3 to 2 times the detour processing set time for raw fuel. Is preferred.

(F) In each of the first to third embodiments described above, the fuel gas generation unit P is illustrated as being provided with the transformation unit 5 and the selective oxidation unit 6, but the polymer type fuel cell is more fuel gas. When it is not required that the concentration of carbon monoxide is low, the selective oxidation unit 6 can be omitted, or the transformation unit 5 and the selective oxidation unit 6 can be omitted.

(G) The hydrocarbon-based raw fuel is not limited to the natural gas-based city gas (13A) exemplified in the above embodiment, and various kinds of fuels such as alcohols such as propane gas and methanol are used. Can be used.

Block diagram showing overall configuration of fuel cell power generator The figure which shows the flowchart of control operation of the fuel cell power generation device which concerns on 1st Embodiment. The figure which shows the flowchart of control operation of the fuel cell power generation device which concerns on 1st Embodiment. The figure which shows the flowchart of control operation of the fuel cell power generation device which concerns on 1st Embodiment. The figure which shows the flowchart of control operation of the fuel cell power generation device which concerns on 1st Embodiment. The figure which shows the flowchart of control operation of the fuel cell power generation device which concerns on 2nd Embodiment. The figure which shows the flowchart of control operation | movement of the fuel cell electric power generating apparatus which concerns on 3rd Embodiment. The figure which shows the flowchart of control operation | movement of the fuel cell electric power generating apparatus which concerns on 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Desulfurization part 2 Reforming part 3 Reforming burner B Steam generation part G Fuel cell K Raw fuel supply means P Fuel gas generation part Rb Battery bypass flow path Ru Normal flow path

Claims (5)

A desulfurization section that desulfurizes hydrocarbon-based raw fuel supplied from the raw fuel supply means, and a desulfurization raw fuel supplied from the desulfurization section is reformed mainly with hydrogen gas by steam while being heated by a reforming burner A fuel gas generation unit that includes a reforming unit that performs a reforming process on the processing gas, and that generates a fuel gas mainly composed of hydrogen gas;
A fuel cell that is supplied with fuel gas from the fuel gas generator and generates power;
A steam generation unit that mixes reforming steam generated by heating the supplied reforming water with the raw fuel supplied from the desulfurization unit to the reforming unit;
A normal flow path for supplying the fuel gas generated in the fuel gas generation unit to the fuel cell and supplying exhaust fuel gas discharged from the fuel cell after being used for power generation to the reforming burner;
In the fuel cell power generation apparatus provided with a battery bypass flow path that bypasses the fuel cell and supplies the fuel gas generated in the fuel gas generator to the reforming burner,
When stopping, the combustion of the reforming burner is stopped, and until the temperature of the reforming section falls to a temperature at which the raw fuel can be prevented from thermal decomposition and water vapor condensation can be prevented, Among the supply and the supply of steam by the steam generation unit, at least the supply of steam by the steam generation unit is continued, and the temperature of the reforming unit is lowered to a temperature at which the raw fuel can be prevented from being thermally decomposed and the steam can be prevented from condensing. And stopping the supply of water vapor by the water vapor generation unit and supplying the raw fuel by the raw fuel supply means, and performing a process at the time of filling the fuel gas generation unit and the fuel cell with the raw fuel,
At the time of start-up, combustion of the reforming burner is started, and when the temperature of the reforming unit rises to a temperature at which the raw fuel can be prevented from thermal decomposition and steam condensation can be prevented, steam supply by the steam generating unit When the raw fuel filled in the fuel gas generation unit and the fuel cell is replaced with water vapor, and the temperature of the reforming unit is raised to a temperature capable of reforming, the raw fuel supply is started. An operation method of a fuel cell power generation device that performs a start-up process for starting supply of raw fuel by means,
In a state in which the fuel gas generation unit and the fuel cell are filled with nitrogen gas, the normal flow path is switched to the normal flow state before the start-up process, or the normal flow is performed. The raw fuel is supplied by the raw fuel supply means in a state in which both the path and the battery bypass flow path are switched to the flowing state, and the nitrogen gas filled in the fuel gas generation unit and the fuel cell is supplied. A method of operating a fuel cell power generation apparatus that performs an initial replacement process for replacing with raw fuel. A desulfurization section that desulfurizes hydrocarbon-based raw fuel supplied from the raw fuel supply means, and a desulfurization raw fuel supplied from the desulfurization section is reformed mainly with hydrogen gas by steam while being heated by a reforming burner A fuel gas generation unit that includes a reforming unit that performs a reforming process on the processing gas, and that generates a fuel gas mainly composed of hydrogen gas;
A fuel cell that is supplied with fuel gas from the fuel gas generator and generates power;
A steam generation unit that mixes reforming steam generated by heating the supplied reforming water with the raw fuel supplied from the desulfurization unit to the reforming unit;
A normal flow path for supplying the fuel gas generated in the fuel gas generation unit to the fuel cell and supplying exhaust fuel gas discharged from the fuel cell after being used for power generation to the reforming burner;
In the fuel cell power generation apparatus provided with a battery bypass flow path that bypasses the fuel cell and supplies the fuel gas generated in the fuel gas generator to the reforming burner,
When stopping, the combustion of the reforming burner is stopped, and until the temperature of the reforming section falls to a temperature at which the raw fuel can be prevented from thermal decomposition and water vapor condensation can be prevented, Among the supply and the supply of steam by the steam generation unit, at least the supply of steam by the steam generation unit is continued, and the temperature of the reforming unit is lowered to a temperature at which the raw fuel can be prevented from being thermally decomposed and the steam can be prevented from condensing. And stopping the supply of water vapor by the water vapor generation unit and supplying the raw fuel by the raw fuel supply means, and performing a process at the time of filling the fuel gas generation unit and the fuel cell with the raw fuel,
At the time of start-up, combustion of the reforming burner is started, and when the temperature of the reforming unit rises to a temperature at which the raw fuel can be prevented from thermal decomposition and steam condensation can be prevented, steam supply by the steam generating unit When the raw fuel filled in the fuel gas generation unit and the fuel cell is replaced with water vapor, and the temperature of the reforming unit is raised to a temperature capable of reforming, the raw fuel supply is started. An operation method of a fuel cell power generation device that performs a start-up process for starting supply of raw fuel by means,
In a state in which the fuel gas generation unit and the fuel cell are filled with nitrogen gas, the raw fuel supply is performed in a state in which the battery bypass flow path is switched to a flow state before the start-up process is performed. The raw fuel is supplied by the means, and the nitrogen gas filled in the fuel gas generation unit is replaced with the raw fuel, and then the state in which the normal flow path is switched to the flow state or the normal flow is obtained. The raw fuel is supplied by the raw fuel supply means in a state where both the flow path and the battery bypass flow path are switched to the flowing state, and the nitrogen gas filled in the fuel cell is replaced with the raw fuel. A method of operating a fuel cell power generator that performs an initial replacement process.   3. The fuel according to claim 1, wherein when the raw fuel replaced with the nitrogen gas charged in the fuel gas generation unit and the fuel cell is burned in the reforming burner, the initial replacement process is terminated. Operation method of battery power generation device. A desulfurization section that desulfurizes hydrocarbon-based raw fuel supplied from the raw fuel supply means, and a desulfurization raw fuel supplied from the desulfurization section is reformed mainly with hydrogen gas by steam while being heated by a reforming burner A fuel gas generation unit that includes a reforming unit that performs a reforming process on the processing gas, and that generates a fuel gas mainly composed of hydrogen gas;
A fuel cell that is supplied with fuel gas from the fuel gas generator and generates power;
A steam generation unit that mixes reforming steam generated by heating the supplied reforming water with the raw fuel supplied from the desulfurization unit to the reforming unit;
A normal flow path for supplying the fuel gas generated in the fuel gas generation unit to the fuel cell and supplying exhaust fuel gas discharged from the fuel cell after being used for power generation to the reforming burner;
In the fuel cell power generation apparatus provided with a battery bypass flow path that bypasses the fuel cell and supplies the fuel gas generated in the fuel gas generator to the reforming burner,
When stopping, the combustion of the reforming burner is stopped, and until the temperature of the reforming section falls to a temperature at which the raw fuel can be prevented from thermal decomposition and water vapor condensation can be prevented, Among the supply and the supply of steam by the steam generation unit, at least the supply of steam by the steam generation unit is continued, and the temperature of the reforming unit is lowered to a temperature at which the raw fuel can be prevented from being thermally decomposed and the steam can be prevented from condensing. And stopping the supply of water vapor by the water vapor generation unit and supplying the raw fuel by the raw fuel supply means, and performing a process at the time of filling the fuel gas generation unit and the fuel cell with the raw fuel,
At the time of start-up, combustion of the reforming burner is started, and when the temperature of the reforming unit rises to a temperature at which the raw fuel can be prevented from thermal decomposition and steam condensation can be prevented, steam supply by the steam generating unit When the raw fuel filled in the fuel gas generation unit and the fuel cell is replaced with water vapor, and the temperature of the reforming unit is raised to a temperature capable of reforming, the raw fuel supply is started. An operation method of a fuel cell power generation device that performs a start-up process for starting supply of raw fuel by means,
In the startup process,
When the fuel gas generating unit and the fuel cell are filled with nitrogen gas, after the start of the supply of raw fuel by the raw fuel supply means, until the set time for detour processing for nitrogen elapses, the battery A state in which the bypass flow path is switched to a flow state, and when the set time for the bypass process for nitrogen elapses, the normal flow path is switched to a flow state; and
When the fuel gas generation unit and the fuel cell are filled with raw fuel, after the raw fuel supply by the raw fuel supply means is started, the raw fuel for the raw fuel is shorter than the detour processing set time for nitrogen. The battery bypass flow path is switched to the flow state until the detour processing set time elapses, and the normal flow path is switched to the flow state when the raw fuel detour processing set time elapses. Operation method of the fuel cell power generator to be switched.   The method for operating a fuel cell power generator according to claim 4, wherein the setting time for bypass processing for nitrogen is 1.5 times or more of the setting time for bypass processing for raw fuel.

Images