JP2006344408A - Fuel cell power generating device and re-starting method and device for fuel cell power generating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel cell power generating device and re-starting method and a device for the same capable of appropriately performing re-start after abnormal stoppage. <P>SOLUTION: The fuel cell power generating device is provided with a fuel gas generation part R equipped with a reformation part 16 heated by a reformation burner 15, a raw fuel switching valve V1 intermittently supplying the raw fuel to the fuel gas generation part R, a fuel cell 1 having a fuel electrode to which the fuel gas generated at the fuel gas generation part R is supplied through a fuel gas supplying passage 2, a fuel electrode exhaust gas passage 26 supplying exhaust gas exhausted from a fuel electrode of the fuel cell 1 to the reformation burner 15, a fuel supply passage 29 for burner provided with a switching valve V3 blocking and releasing the fuel for the burner, supplying the fuel gas to the reformation burner 15, a blower 32 for draining water, blowing a fuel gas supply passage 2, and a water draining means 33 arranged at reformation burner 15 side of the fuel electrode exhaust gas passage 26, draining the water flowing through the fuel electrode exhaust gas passage 2 by means of the air blow from the blower 32 for draining water. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention comprises a reforming section for reforming a supplied hydrocarbon-based raw fuel and steam by heating a reforming burner to generate a reforming treatment gas containing hydrogen gas as a main component. A fuel gas generation unit that generates a fuel gas mainly composed of gas;
A raw fuel on-off valve for intermittently supplying raw fuel to the fuel gas generation unit;
A fuel cell in which the fuel gas generated in the fuel gas generator is supplied to the fuel electrode through a fuel gas supply path to generate electricity;
A fuel electrode exhaust gas passage for supplying fuel reformer exhaust gas discharged from the fuel electrode of the fuel cell to the reforming burner;
A fuel cell power generation device provided with a burner fuel supply path that supplies gas fuel to the reforming burner and is provided with a burner fuel on-off valve, a method for restarting the fuel cell power generation device, and the fuel cell power generation device Relates to the restarting device.

  In such a fuel cell power generation apparatus, in a power generation operation in which power is generated by a fuel cell, a raw fuel on-off valve is opened and raw fuel is supplied to a fuel gas generation unit. Fuel gas containing hydrogen gas as a main component is generated by the separately supplied water vapor, and the generated fuel gas is supplied to the fuel electrode of the fuel cell through the fuel gas supply path to generate power in the fuel cell. During the power generation operation, the fuel electrode exhaust gas discharged from the fuel electrode of the fuel cell is supplied to the reformer burner through the fuel electrode exhaust gas passage, and the fuel electrode exhaust gas is combusted in the reformer burner to Part is heated.

When the power generation operation is normally stopped, the raw fuel on-off valve is closed to stop the supply of the raw fuel gas to the fuel gas generation unit to stop the power generation of the fuel cell. A normal-time stop process is performed in which gas is supplied from the fuel gas generation unit to fill the fuel gas generation unit and the fuel cell.
In other words, by holding the fuel cell power generation device in the stopped state while the fuel gas generating unit and the fuel cell are filled with the purge gas, the deterioration of the reforming catalyst of the reforming unit, the electrode catalyst of the fuel cell, and the like is prevented. And it is comprised so that the fall of the power generation performance of a fuel cell power generator may be suppressed.

Incidentally, an inert gas such as nitrogen gas may be used as the purge gas. In this case, it is necessary to install an inert gas supply facility for supplying the inert gas, such as a gas cylinder. As the power generation device increases in size, maintenance of the inert gas supply facility becomes complicated.
Therefore, in recent years, raw fuel gas is used as the purge gas in order to avoid such an increase in the size and maintenance of the fuel cell power generator.
When raw fuel gas is used as the purge gas, in the normal stop process, the raw fuel on-off valve is closed while the supply of water vapor to the fuel gas generator is continued, and the fuel gas generator is supplied to the fuel gas generator. By stopping the supply of the raw fuel gas, steam replacement processing for replacing the gas in the fuel gas generation unit and the fuel cell with water vapor, and the temperature of the reforming unit causes carbon deposition due to thermal decomposition of the raw fuel gas. When the temperature is lowered to a temperature at which the water vapor can be prevented and the water vapor is prevented from condensing, the supply of the water vapor to the fuel gas generation unit is stopped and the raw fuel on-off valve is opened to supply the raw fuel gas to the fuel gas generation unit. Then, a purge process for replacing the water vapor in the fuel gas generator and the fuel cell with the raw fuel gas is sequentially performed (for example, see Patent Document 1).

  Further, although not described in Patent Document 1, before starting the power generation operation, the burner fuel on-off valve is opened and the reformer burner is ignited, and the burner fuel is supplied by the reformer burner. A start-up operation process is performed in which gas fuel supplied through the passage is combusted and the reforming section is heated so that a reforming reaction is possible.

JP 2003-306309 A

By the way, when an abnormality such as a power failure of the commercial power supply occurs, the normal stop process for filling the fuel gas generation unit and the fuel cell with the raw fuel gas as the purge gas cannot be performed. The valve is closed to stop the supply of raw fuel gas to the fuel gas generation unit and stop the power generation operation to stop during an abnormality.
Therefore, when the stop is performed in the event of an abnormality, the fuel gas remains in the fuel gas supply path and the fuel electrode exhaust gas remains in the fuel electrode exhaust path. Thus, water vapor contained in the fuel gas and the fuel electrode exhaust gas is condensed, and water remains in the fuel gas supply channel and the fuel electrode exhaust gas channel. Will flow to the reforming burner, or the water vapor contained in the fuel gas flowing into the reforming burner due to convection and the fuel electrode exhaust gas will be condensed, and water will remain in the reforming burner.

  However, conventionally, when the fuel cell power generation device is started after an abnormal stop is performed, if the startup operation process is performed, as described above, the fuel gas supply path, the fuel electrode exhaust gas path, and the reformer burner are Since water remains, even if the reforming burner cannot be ignited promptly or can be ignited once in the startup operation process, the remaining water remains in the reforming burner. In other words, the reforming burner cannot be properly ignited and the start-up operation process cannot be performed properly.

  The present invention has been made in view of such a situation, and an object of the present invention is to restart a fuel cell power generation device and a fuel cell power generation device that can appropriately perform a restart after a stop at an abnormal time is performed. It is an object to provide a method and a restart device for a fuel cell power generator.

The fuel cell power generator according to the present invention includes a reforming unit that generates a reforming process gas mainly composed of hydrogen gas by reforming a supplied hydrocarbon-based raw fuel and water vapor by heating a reforming burner. A fuel gas generation unit that generates a fuel gas mainly composed of hydrogen gas,
A raw fuel on-off valve for intermittently supplying raw fuel to the fuel gas generation unit;
A fuel cell in which the fuel gas generated in the fuel gas generator is supplied to the fuel electrode through a fuel gas supply path to generate electricity;
A fuel electrode exhaust gas passage for supplying fuel reformer exhaust gas discharged from the fuel electrode of the fuel cell to the reforming burner;
A gas fuel is supplied to the reforming burner, and a burner fuel supply passage provided with a burner fuel on-off valve is provided,
The first characteristic configuration is provided with a drainage blower for blowing air to the fuel gas supply path,
The fuel electrode exhaust gas passage is provided with a drainage means for draining water flowing through the fuel electrode exhaust gas passage in accordance with the air blow by the drainage blower at a location on the reforming burner side.

  In other words, a drainage fan that blows air to the fuel gas supply path is provided, and drainage means that drains water flowing through the fuel electrode exhaust gas path along with the ventilation by the drainage blower at a location on the reforming burner side of the fuel electrode exhaust gas path Therefore, when starting the fuel cell power generation device after an abnormal stop has been performed, the drainage blower is operated and the fuel gas supply passage is blown before the start-up operation process is performed. The water remaining in the gas supply passage and the fuel electrode exhaust passage is caused to flow to the location of the drainage means in the fuel electrode exhaust passage and drained by the drainage means, and the water remaining in the reformer burner is It becomes possible to discharge the combustion gas from the reforming burner through an exhaust port for exhausting the combustion gas.

Therefore, when performing the start-up operation processing, water should not remain in the reforming burner, or water remaining in the fuel gas supply path or the fuel electrode exhaust gas path will not flow into the reforming burner. Therefore, the reforming burner can be appropriately ignited in the startup operation process.
In short, it has become possible to provide a fuel cell power generator capable of appropriately performing a restart after an abnormal stop.

In addition to the first feature configuration, the second feature configuration of the fuel cell power generator is
Battery bypass flow state switching means capable of switching to a battery bypass flow state in which the air blown from the drainage blower to the fuel gas supply path bypasses the fuel cell and flows to the fuel electrode exhaust gas path. It is characterized by being provided.

  That is, there is provided a battery bypass flow state switching means capable of switching to a battery bypass flow state in which the air blown from the drainage blower to the fuel gas supply path bypasses the fuel cell and flows through the fuel electrode exhaust gas path. Therefore, in the state where the battery bypass flow state switching means is switched to the battery bypass flow state switching means, the drainage blower is operated to blow air to the fuel gas supply path, whereby the drainage blower is changed to the fuel gas supply path. The blown air is passed through the fuel electrode exhaust gas passage in a state of bypassing the fuel cell, and water remaining in the fuel gas supply passage and the fuel electrode exhaust gas passage is drained by the drainage means, and is also supplied to the reformer burner. The remaining water can be discharged through the exhaust port.

And by making the air from the blower for drainage flow around the fuel cell, it can be avoided that the fuel cell is unnecessarily pressurized or unnecessarily dried. It is possible to avoid a decrease in the durability of the fuel cell.
Accordingly, it is possible to appropriately perform the restart after the abnormal stop is performed while avoiding the deterioration of the durability of the fuel cell.

In addition to the first or second feature configuration, the third feature configuration of the fuel cell power generator is
A bleed blower for adding air for oxidizing carbon monoxide contained in the fuel gas to the fuel gas flowing through the fuel gas supply path is provided,
The bleed blower is configured to be used also as the drainage blower.

  That is, a bleed blower that adds air for oxidizing carbon monoxide contained in the fuel gas flowing through the fuel gas supply passage is also used as the drainage blower, and is stopped in an abnormal state. When the fuel cell power generation device is started after the operation, before the start-up operation process is performed, the water blown to the fuel gas supply passage by the bleed blower and the water remaining in the fuel gas supply passage or the fuel electrode exhaust passage is removed. While being drained by the drainage means, water remaining in the reforming burner is discharged through the exhaust port.

That is, in such a fuel cell power generator, the fuel gas generated in the fuel gas generation unit contains carbon monoxide, and carbon monoxide may be generated at the fuel electrode or the like. If the electrode catalyst of the fuel cell is poisoned by the carbon monoxide that is present in this way, the power generation performance is lowered and the durability is lowered.
Therefore, a bleed blower for adding air to the fuel gas flowing through the fuel gas supply path is provided so that the fuel gas to which air has been added is supplied to the fuel electrode, and the fuel gas is absorbed by oxygen in the air. In some cases, the carbon monoxide produced in the fuel electrode or the like is oxidized to suppress poisoning of the electrode catalyst by carbon monoxide.

If the electrode catalyst is poisoned by the carbon monoxide described above, the power generation performance will be reduced. If carbon monoxide is adsorbed on the electrode catalyst of the fuel electrode and the electrode catalyst is poisoned, the power generation reaction at the fuel electrode As a result, the power generation performance is reduced.
In addition, the point that carbon monoxide is included in the fuel gas will be explained. The reformed gas generated by reforming hydrocarbon-based raw fuel with steam in the reforming section provided in the fuel gas generating section. Since the quality treatment gas contains carbon monoxide in addition to hydrogen gas, the fuel gas contains carbon monoxide.
In addition, to explain that carbon monoxide is generated at the fuel electrode, etc., if carbon dioxide is contained in the fuel gas in addition to hydrogen, hydrogen and carbon dioxide react at the fuel electrode. A reaction in which carbon monoxide and water are generated occurs, and carbon monoxide is generated at the fuel electrode or the like.

  Therefore, when a bleed blower is provided, the bleed blower can also be used as a drainage blower so that the restart after an abnormal stop is appropriately performed while reducing the cost. I can do it now.

The fourth characteristic configuration of the fuel cell power generator is in addition to the first or second characteristic configuration described above,
The fuel gas generation unit includes a selective oxidation unit that selectively oxidizes carbon monoxide gas in the reformed gas generated in the reforming unit with air supplied from a selective oxidation blower,
A drainage flow state switching means is provided which is switchable to a drainage flow state for supplying air from the selective oxidation blower to the fuel gas supply path,
The selective oxidation blower is configured to be used also as the drainage blower.

That is, during the power generation operation, in the selective oxidation unit, the carbon monoxide gas in the reformed gas generated in the reforming unit is selectively oxidized with air supplied from the selective oxidation blower. A fuel gas having a low carbon monoxide content is generated in the gas generator, and the fuel gas is supplied to the fuel electrode of the fuel cell through the fuel gas supply path.
Then, when starting the fuel cell power generation device after stopping in the event of an abnormality, the air from the selective oxidation blower is supplied to the fuel gas supply path by the drainage flow state switching means before performing the startup operation process. In this state, the air from the selective oxidation blower is blown by the selective oxidation blower, and the air from the selective oxidation blower flows through the fuel gas supply passage to the fuel gas supply passage and the fuel electrode exhaust passage. The remaining water is drained by the drainage means, and the water remaining in the reformer burner is discharged through the exhaust port.

That is, in such a fuel cell power generation device, in order to suppress poisoning of the electrode catalyst of the fuel electrode by carbon monoxide by generating a fuel gas having a low carbon monoxide content in the fuel gas generation unit. The fuel gas generation unit may be provided with a selective oxidation unit that selectively oxidizes carbon monoxide gas in the reformed gas generated in the reforming unit with air supplied from a selective oxidation blower. .
Therefore, when the selective oxidation unit is provided in the fuel gas generation unit, the selective oxidation blower that supplies the selective oxidation air to the selective oxidation unit is also used as the drainage blower, so that the abnormality can be achieved while reducing the cost. It is now possible to properly restart after an outage.

In the method for starting a fuel cell power generator according to the present invention, a reforming treatment gas containing hydrogen gas as a main component is produced by reforming a supplied hydrocarbon-based raw fuel and steam by heating a reforming burner. A fuel gas generation unit that includes a reforming unit and generates a fuel gas mainly composed of hydrogen gas;
A raw fuel on-off valve for intermittently supplying raw fuel to the fuel gas generation unit;
A fuel cell in which the fuel gas generated in the fuel gas generator is supplied to the fuel electrode through a fuel gas supply path to generate electricity;
A fuel electrode exhaust gas passage for supplying fuel reformer exhaust gas discharged from the fuel electrode of the fuel cell to the reforming burner;
A method of restarting a fuel cell power generator provided with a burner fuel supply path provided with gas fuel to the reforming burner and provided with a burner fuel on-off valve,
The characteristic configuration is that when the fuel cell power generation device is started after the abnormal fuel stop is performed by closing the raw fuel on-off valve to stop the power generation of the fuel cell, the fuel gas supply passage is blown By operating a drainage blower, the water in the fuel gas supply passage and the fuel electrode exhaust gas passage is led to the location on the reforming burner side in the fuel electrode exhaust gas passage or the drainage means provided in the reforming burner. Then, the burner fuel on-off valve is opened, the gas fuel supplied through the burner fuel supply passage is burned in the reformer burner, and the reforming section is subjected to the reforming reaction. It is characterized in that a start-up operation process for heating to a possible temperature is performed.

  That is, when the fuel cell power generation device is started after the stop in the event of an abnormality, the drainage blower that blows air to the fuel gas supply passage is operated, and the water in the fuel gas supply passage and the fuel electrode exhaust passage is used as the fuel electrode exhaust gas. The wastewater treatment is conducted by discharging the wastewater by guiding to the reformer burner side or the drainage means provided in the reformer, and then the burner fuel on-off valve is opened, and the burner fuel supply passage is opened by the reformer burner. The start-up operation process is performed in which the gas fuel supplied through is burned to heat the reforming section to a temperature at which the reforming reaction can be performed.

Therefore, when performing the start-up operation processing, water should not remain in the reforming burner, or water remaining in the fuel gas supply path or the fuel electrode exhaust gas path will not flow into the reforming burner. Therefore, the reforming burner can be appropriately ignited in the startup operation process.
In short, it is possible to provide a method for restarting a fuel cell power generation apparatus that can appropriately perform restart after an abnormal stop.

The restart device of the fuel cell power generator according to the present invention generates a reforming treatment gas containing hydrogen gas as a main component by reforming the supplied hydrocarbon-based raw fuel and steam by heating the reforming burner. A fuel gas generation unit that includes a reforming unit that generates a fuel gas containing hydrogen gas as a main component;
A raw fuel on-off valve for intermittently supplying raw fuel to the fuel gas generation unit;
A fuel cell in which the fuel gas generated in the fuel gas generator is supplied to the fuel electrode through a fuel gas supply path to generate electricity;
A fuel electrode exhaust gas passage for supplying fuel reformer exhaust gas discharged from the fuel electrode of the fuel cell to the reforming burner;
A fuel cell power generator restarting device provided with a burner fuel supply path that supplies gas fuel to the reforming burner and is provided with a burner fuel on-off valve,
The characteristic configuration is provided with a blower for drainage that blows air to the fuel gas supply path,
When the control means for controlling the operation is instructed to start the fuel cell power generator after the abnormal fuel stop is performed by closing the raw fuel on-off valve to stop the power generation of the fuel cell, The water in the fuel gas supply path and the fuel electrode exhaust gas path are introduced into the fuel gas supply path to be drained by being led to a portion on the reformer burner side in the fuel electrode exhaust gas path or a drain means provided in the reformer burner. A gas supplied to the reformer burner through the burner fuel supply passage by performing drainage blower operation processing for operating the drainage blower so as to blow, and then opening the burner fuel on-off valve. It is characterized in that a starting heating operation process is performed in which fuel is burned to heat the reforming section to a temperature at which a reforming reaction is possible.

  That is, when the start command for starting the fuel cell power generation device is issued after the stop in the event of an abnormality, the operation control means sends the water in the fuel gas supply path and the fuel electrode exhaust gas path to the reformer burner in the fuel electrode exhaust gas path. The drainage blower actuating process is performed to actuate the drainage blower so as to blow to the fuel gas supply path to be drained by leading to the drainage means provided on the side or reformer burner, and then the burner fuel on-off valve Is opened, and the reforming burner burns the gas fuel supplied through the burner fuel supply path to heat the reforming section to a temperature at which the reforming reaction can be performed.

Therefore, when performing the start-up operation processing, water should not remain in the reforming burner, or water remaining in the fuel gas supply path or the fuel electrode exhaust gas path will not flow into the reforming burner. Therefore, the reforming burner can be appropriately ignited in the startup operation process.
In short, it has become possible to provide a restart device for a fuel cell power generation device that can appropriately restart after an abnormal stop.

[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 generator includes a fuel cell 1 configured to generate power by supplying a fuel gas mainly composed of hydrogen to a fuel electrode and supplying air to an oxygen electrode. The raw fuel gas is used as a raw material to generate the fuel gas, and the generated fuel gas is supplied to the fuel cell 1 through the fuel gas supply path 2. The fuel cell 1 through the reaction air supply path 3. A reaction blower 4 that supplies air for power generation reaction to the fuel gas, air for oxidizing carbon monoxide contained in the fuel gas flowing through the fuel gas supply path 2 (hereinafter referred to as bleed air) A bleed blower 6 for supplying the air through a bleed air supply path 5, a control unit 7 as a control means for controlling the operation of the fuel cell power generator, and the like.

Hereinafter, each part which comprises a fuel cell power generator is demonstrated.
Since the fuel cell 1 is well known, a detailed description thereof will be omitted, and a brief description will be given below.
This fuel cell 1 includes a solid polymer cell (not shown) in which an oxygen electrode (not shown) and a fuel electrode (not shown) are arranged on both sides of a polymer film (not shown) as an electrolyte layer. A plurality of cell stacks (not shown) provided in a stacked state with a cooling water flow part (not shown) interposed between adjacent cells, and fuel gas from the fuel gas generating part R The reaction gas is distributed and supplied to the fuel electrode of each cell through the fuel gas supply path 2, and the reaction air is distributed and supplied from the reaction blower 4 to the oxygen electrode of each cell through the reaction air supply path 3. The cooling water is distributed and supplied to each cooling water flow section through the cooling water circulation path 9.
Then, in a state where each cell is cooled by the cooling water flow portion, power is generated by an electrochemical reaction between hydrogen and oxygen in each cell.

The fuel gas generation unit R supplies the raw fuel gas such as city gas (for example, natural gas-based city gas 13A) supplied through the raw fuel supply channel 11 through the desulfurization unit 12 and the raw water supply channel 13 for desulfurization treatment. The raw material water is evaporated to generate water vapor, the desulfurization raw fuel gas from the desulfurization unit 12 and the water vapor from the water vapor generation unit 14 are supplied in a mixed state, and the raw fuel in the mixed state is supplied In the reforming process gas supplied from the reforming unit 16, the reforming unit 16 generates a reforming process gas mainly composed of hydrogen gas by reforming the gas and water vapor by heating the reforming burner 15. The carbon monoxide is converted to carbon dioxide with water vapor, and the carbon monoxide in the reformed gas supplied from the shift unit 17 is supplied from the selective oxidation blower 18 with selective oxidation air. 19 is configured to include a selective oxidation unit 20 that performs selective oxidation treatment with selective oxidation air supplied through 19 to generate a reforming treatment gas having a low carbon monoxide concentration (for example, 10 ppm or less). .
Then, the reforming process gas obtained by reducing carbon monoxide by the modification process and the selective oxidation process is supplied to the fuel cell 1 through the fuel gas supply path 2 as a fuel gas.

  In the raw fuel supply path 11, a raw fuel on-off valve V <b> 1 that intermittently supplies the raw fuel gas to the fuel gas generation unit R and a raw fuel gas that adjusts the supply amount of the raw fuel gas to the fuel gas generation unit R are provided. A fuel adjustment valve 21 is provided, and the supply amount of the fuel gas supplied to the fuel cell 1 is adjusted by adjusting the supply amount of the raw fuel gas to the fuel gas generator R by the raw fuel adjustment valve 21. The output power from the fuel cell 1 is adjusted to adjust.

  A desulfurization raw fuel gas path 22 for supplying desulfurization raw fuel gas from the desulfurization section 12 to the reforming section 16 is connected to a water vapor supply path 23 for introducing water vapor from the water vapor generation section 14, The steam is supplied to the reforming unit 16 in a mixed state, and the steam supply path 23 is provided with a steam on-off valve V2 for opening and closing the steam supply path 23.

The reforming unit 16 is provided with a reforming unit temperature sensor 25 that detects the temperature of the reforming reaction region inside the reforming unit 16.
A fuel electrode exhaust gas passage 26 that guides the fuel electrode exhaust gas discharged from the fuel electrode of each cell to the reforming burner 15 and a combustion air passage 28 that guides combustion air from the combustion blower 27. Is connected.

  The reformer burner 15 is connected to a burner fuel supply path 29 for supplying a gas fuel such as city gas in addition to the fuel electrode exhaust gas path 26 for supplying fuel, and the burner fuel supply path 29 Furthermore, a burner fuel on-off valve V3 for intermittently supplying gas fuel to the reforming burner 15 and a burner fuel adjusting valve 31 for adjusting the amount of gas fuel supplied to the reforming burner 15 are provided.

A fuel cell outlet on-off valve V4 for opening and closing the fuel electrode side exhaust gas passage 26 is provided at an end portion of the fuel electrode side exhaust gas passage 26 on the reforming burner 15 side.
The combustion exhaust gas of the reforming burner 15 is configured to be discharged outside through the exhaust port 34 of the reforming burner 15.

  The selective oxidation air supply passage 19 is provided with a selective oxidation air on-off valve V7 for intermittently supplying the selective oxidation air to the selective oxidation unit 20.

The reaction air supply path 3 includes a reaction air on-off valve V5 for intermittently supplying the reaction air to the fuel cell 1, and a reaction air for adjusting a supply amount of the reaction air to the fuel cell 1. A control valve 35 is provided.
Incidentally, the amount of reaction air supplied to the fuel cell 1 by the reaction air adjustment valve 35 is changed to the amount of fuel gas supplied to the fuel cell 1 adjusted by the raw fuel adjustment valve 21. It is configured to adjust accordingly.

  The bleed air supply path 5 is provided in a state of being connected to a location upstream of the reaction air on-off valve V5 and the reaction air control valve 35 in the reaction air supply path 3 and the fuel gas supply 2. In addition, the bleed air supply path 5 is provided with a bleed air on / off valve V6 for opening and closing the bleed air supply path 5 and a bleed air adjusting valve 37 for adjusting the amount of bleed air added. .

A part of the air from the reaction blower 4 is supplied to the fuel gas supply passage 2 as bleed air by opening the bleed air on-off valve V6.
That is, the reaction blower 4 is also used as the bleed blower 6.

  In addition, each said on-off valve V1-V7 is comprised so that it may be in a valve closing state, if supply of electric power for operation stops.

In the present invention, a drainage blower 32 for blowing air to the fuel gas supply path 2 is provided, and at the end of the fuel electrode side exhaust gas path 26 on the reforming burner 15 side, along with the blowing by the drainage blower 32. A drain trap 33 is provided as a drainage means for draining water flowing through the fuel electrode exhaust gas passage 26.
Further, the exhaust port 34 of the reforming burner 15 is also configured to function as the drainage means.
Further, in the first embodiment, the reaction blower 4 is also used as the drainage blower 32, that is, the bleed blower 6 is also used as the drainage blower 32.

Next, a method for starting the fuel cell power generator configured as described above will be described.
In this fuel cell power generation device, the details will be described later, but in the state where the normal time stop process is performed and the operation is stopped, the fuel gas generator R, the fuel gas supply path 2, the fuel cell 1, and the fuel electrode exhaust gas supply path A gas path (hereinafter, also referred to as a fuel electrode side gas path) including the gas fuel gas 26 is filled with raw fuel gas as a purge gas.
Further, when the detected value of the gas sensor for detecting the concentration of the combustible gas in the atmosphere around the fuel cell power generation device exceeds the set upper limit concentration, the on-off valves V1 to V7 such as the raw fuel on-off valve V1 are opened. An abnormal stop process is performed by closing the valve, and an abnormal stop for stopping the power generation of the fuel cell 1 is performed.
In addition, when the power supply for controlling the operation of the fuel cell power generation device is stopped, such as for controlling the operation of the on-off valves V1 to V7 due to a power failure or the like of the commercial power source, the on-off valve for raw fuel is used. The on-off valves V1 to V7 such as V1 are closed, and stoppage is performed when an abnormality occurs.

  When the fuel cell power generation device is started when the normal time stop process is performed and the fuel cell power generation device is stopped, the reformer 16 starts heating the reforming unit 16 with the reformer burner 15. When the temperature of the partial heat treatment and the reforming unit 16 is raised to a set temperature for replacement (for example, 400 ° C.) that can prevent carbon deposition due to thermal decomposition of the raw fuel gas and prevent condensation of the water vapor, the water vapor generating unit The reforming unit 16 is configured to start reforming by sequentially performing start-up steam replacement processing in which steam is supplied from 14 and the raw fuel gas in the fuel electrode side gas path is replaced with steam. A normal start-up operation process for heating to a temperature (for example, 650 ° C.) is performed, and then the raw fuel on-off valve V1 is opened to generate fuel gas in the fuel gas generator R, and the generated fuel Gas is supplied to the fuel cell 1 Then, power generation operation processing for generating power in the fuel cell 1 is performed.

  In addition, when the fuel cell power generation device is started after the abnormal fuel stop is performed by closing the raw fuel on-off valve V1 to stop the power generation of the fuel cell 1, the drainage blower 32 is also used. The reaction blower 4 is actuated to conduct a drainage treatment in which the water in the fuel gas supply passage 2 and the fuel electrode exhaust passage 26 is led to the drain trap 33 and the exhaust port 34 of the reforming burner 15 to be drained. The burner fuel on-off valve V3 is opened, the gas fuel supplied through the burner fuel supply passage 29 is burned in the reformer burner 15, and the reforming section 16 can undergo a reforming reaction. An abnormal start-up operation process for heating to the reforming start set temperature is performed, and then the power generation operation process is performed.

It should be noted that the fuel gas supply passage is supplied with an amount of air suitable for draining the fuel gas supply passage 2 and the fuel electrode exhaust passage 26 through the drain trap 33 and the exhaust port 34 of the reforming burner 15. The control conditions for waste water treatment of the bleed air control valve 37 are set in advance so that the air can be supplied to the air.
In the wastewater treatment, the bleed air control valve 37 is controlled under the wastewater treatment control conditions.

That is, when the stop is performed in the event of an abnormality, the fuel gas remains in the fuel gas supply path 2 and the fuel electrode exhaust gas remains in the fuel electrode exhaust path 26. In the polar exhaust gas passage 26, the fuel gas and water vapor contained in the fuel electrode exhaust gas are condensed, and water remains in the fuel gas supply passage 2 and the fuel electrode exhaust gas passage 26.
Then, when the fuel cell power generation device is started after the abnormal stop is performed, the wastewater treatment is performed as described above, and the fuel is blown to the fuel gas supply path 2 by the reaction blower 4 functioning as the drainage blower 32. Therefore, the air from the reaction blower 4 flows through the fuel gas supply path 2, the fuel cell 1, the fuel electrode exhaust gas path 26 and the reformer burner 15 and is discharged through the exhaust port 34 of the reformer burner 15. Therefore, due to the air flow, water remaining in the fuel gas supply path 2, the fuel cell 1, and the fuel electrode exhaust gas path 26 flows toward the reforming burner 15, and the drain trap 33 and the modified It is discharged through the exhaust port 34 of the quality burner 15.
Therefore, when the abnormal start-up operation process is performed, water remains in the reforming burner 15 or water remaining in the fuel gas supply path 2, the fuel cell 1, and the fuel electrode exhaust gas path 26 enters the reforming burner 15. Since it is possible to prevent the fluid from flowing, the reforming burner 15 can be appropriately ignited in the startup operation process at the time of abnormality.

The drainage process, the normal start operation process, the abnormal start operation process, the power generation operation process, and the normal stop process will be described.
First, the wastewater treatment will be described. In the wastewater treatment, the bleed air on-off valve V6 and the fuel cell outlet on-off valve V4 are opened, and the reaction blower 4 that also serves as the drainage blower 32 is used. To maintain the state for a set time for wastewater treatment.

  The set time for wastewater treatment is that substantially all of the water remaining in the fuel gas supply path 2, the fuel cell 1, and the fuel electrode exhaust gas path 26 is blown by the reaction blower 4 that also serves as the drainage blower 32. It is set to be longer than the time required to flow toward the reforming burner 15 and to discharge through the drain trap 33 and the exhaust port 34 of the reforming burner 15.

  Next, the normal startup operation process will be described. In the reforming part heating process of the normal startup operation process, the burner fuel on-off valve V3 is opened and the combustion blower 27 is operated. An ignition device (not shown) is operated to ignite the reforming burner 15, and the reforming unit 16 is heated by burning the gas fuel supplied through the burner fuel supply passage 29 in the reforming burner 15.

  The startup steam replacement process of the normal startup operation process is executed when the temperature detected by the reformer temperature sensor 25 reaches the replacement set temperature. In the startup steam replacement process, the steam on / off valve V2 and The fuel cell outlet opening / closing valve V4 is opened. That is, the water vapor supplied from the water vapor generation unit 14 through the water vapor supply path 23 is converted into the reforming unit 16, the conversion unit 17, the selective oxidation unit 20, the fuel gas supply channel 2, the fuel cell 1, the fuel electrode exhaust gas channel 26, and the reforming. As the burner 15 flows, the raw fuel gas filled in the fuel electrode side gas path is pushed to the reformer burner 15 and combusted in the reformer burner 15, and the combustion gas is discharged to the exhaust port. Therefore, the raw fuel gas in the fuel electrode side gas path is replaced with water vapor.

  Next, the abnormal start operation process will be described. In the abnormal start operation process, the burner fuel on-off valve V3 is opened and the combustion blower 27 is operated, and an ignition device (not shown) is installed. The reforming burner 15 is ignited, and the reforming unit 16 is heated by burning the gas fuel supplied through the burner fuel supply passage 29 in the reforming burner 15.

  Next, the power generation operation process will be described. The power generation operation process is executed when the temperature detected by the reforming unit temperature sensor 25 becomes the reforming start set temperature in the normal time start operation process or the abnormal time start operation process. The raw fuel on-off valve V1, the steam on-off valve V2, the reaction air on-off valve V5, the bleed air on-off valve V6, and the selective oxidation air on-off valve V7 are opened.

  That is, when the power generation operation process is performed, fuel gas is generated in the fuel gas generation unit R, and the fuel gas generated in the fuel gas generation unit R is supplied from the bleed air supply path 5 to the bleed air. In addition to being supplied to the fuel electrode of the fuel cell 1 through the fuel gas supply path 2, the reaction air is supplied to the oxygen electrode of the fuel cell 1 through the reaction air supply path 3. The fuel electrode exhaust gas generated and discharged from the fuel electrode of the fuel cell 1 is supplied to the reforming burner 15 through the fuel electrode exhaust gas passage 26, and the entire amount of the fuel electrode exhaust gas is combusted from the combustion air supply passage 28. The reforming part 16 is heated by burning with working air.

  Next, the normal time stop process will be described. In the normal time stop process, the raw fuel gas is supplied to the fuel gas generation unit R in a state where the supply of water vapor to the fuel gas generation unit R is continued. When stopping, the generation of fuel gas is stopped, and the reforming burner 15 is extinguished to stop the heating of the reforming section 16, and the gas in the fuel electrode side gas path is replaced with water vapor. When the temperature of the reforming unit 16 is reduced to the set temperature for replacement, which can prevent carbon deposition due to thermal decomposition of the raw fuel gas and can prevent condensation of water vapor, the steam to the fuel gas generation unit R And supply the raw fuel gas to the fuel gas generating section R, replace the water vapor in the fuel electrode side gas path with the raw fuel gas, and purge the inside of the fuel electrode side gas path Fill raw fuel gas as gas Sequentially performed over di processing.

  In the stop-time steam replacement process, the raw fuel on-off valve V1 and the selective oxidation are maintained in a state in which the steam on-off valve V2 is kept open and the supply of water vapor to the fuel gas generator R is continued. And the supply of fuel gas to the fuel cell 1 is stopped, and the reaction air on-off valve V5 is closed. The supply of the reaction air to the fuel cell 1 is stopped to stop the power generation of the fuel cell 1, and the burner fuel on-off valve V3 is opened and the gas fuel is supplied through the burner fuel supply passage 29. Is being supplied to the reforming burner 15, the burner fuel on-off valve V3 is closed.

Then, the gas inside the fuel electrode side gas path is forced to flow into the reforming burner 15 by water vapor and burned in the reforming burner 15, and the combustion gas is discharged through the exhaust port 34. The gas inside the fuel electrode side gas path is replaced with water vapor.
Further, since the supply of fuel to the reforming burner 15 is stopped, the reforming burner 15 is extinguished and heating of the reforming section 16 by the reforming burner 15 is stopped.

  The purge process is executed when the temperature detected by the reforming section temperature sensor 25 reaches the replacement set temperature. In the purge process, the steam on-off valve V2 is closed and the raw fuel on-off valve V1 is opened. The state is maintained for the first set time, and when the first set time elapses, the fuel cell outlet on-off valve V4 is closed, and the state is maintained for the second set time. When the second set time elapses, the raw fuel on-off valve V1 is closed.

In the first set time, after the steam on-off valve V2 is closed and the raw fuel on-off valve V1 is opened, all of the water vapor in the fuel electrode side gas path is discharged through the exhaust port 34, It is set longer than the time required for the water vapor in the fuel electrode side gas path to be replaced with the raw fuel gas.
Further, the second set time can maintain the state in which the raw fuel gas is sealed in the fuel electrode side gas path at a pressure higher than the external pressure even when the temperature in the fuel electrode side gas path is lowered to the normal temperature. It is set to be longer than the time required to enclose the raw fuel gas in the fuel electrode side gas path.

Hereinafter, the control operation of the control unit 7 will be described.
In this embodiment, the control unit 7 is used to automatically perform the drainage process, the normal start operation process, the abnormal start operation process, the power generation operation process, the normal stop process, and the abnormal stop process. It is configured to be performed.

  In the present invention, the control unit 7 causes the start command to start the fuel cell power generator after the abnormal fuel stop is performed to close the raw fuel on-off valve V1 and stop the power generation of the fuel cell 1. Is commanded, the water in the fuel gas supply passage 2 and the fuel electrode exhaust passage 26 is blown to the fuel gas supply passage 2 to be led to the drain trap 33 and the exhaust port 34 of the reforming burner 15 for drainage. The drainage fan is operated by executing the drainage fan operation process for operating the reaction fan 4 that also serves as the drainage fan 32, and then the burner fuel on-off valve V3 is opened. Then, the start-up heating operation process is performed in which the reformed burner 15 burns the gas fuel supplied through the burner fuel supply passage 29 to heat the reforming unit 16 to a temperature at which the reforming reaction can be performed. It is arranged to execute the abnormal starting operation processing by.

Based on the time chart shown in FIG. 2, the control operation of the control unit 7 when starting the fuel cell power generator after the abnormal stop is described.
When the fuel cell power generation device is stopped in an abnormal state, the control unit 7 is configured to store that the fuel cell power generation device is in an abnormal stop state in which the fuel cell power generation device is stopped in an abnormal state.
In the state where the fuel cell power generation device is stopped due to the stop at the time of abnormality, all of the on-off valves V1 to V7 are closed, and all of the reaction, selective oxidation, and combustion are used. Blowers 4, 18, and 27 are in a stopped state.

The control unit 7 stores the fact that it is in the abnormal stop state, and when the start command is issued by an operation switch (not shown) provided on the operation panel or the like, the fuel cell outlet opening / closing is opened and closed. The valve V4 and the bleed air on-off valve V6 are opened, and the reaction blower 4 that also serves as the drainage blower 32 is operated, and the state is maintained until the wastewater treatment set time elapses. Execute drainage blower operation processing.
In the wastewater blower operation process, the control unit 7 controls the bleed air control valve 37 under the wastewater treatment control conditions.

  Subsequently, when the set time for wastewater treatment elapses, the control unit 7 closes the bleed air on-off valve V6 and stops the reaction blower 4 that also serves as the drainage blower 32, and The drainage blower operation process is terminated, the burner fuel on-off valve V3 is opened, the combustion blower 27 is activated, the ignition device is activated, the reforming burner 15 is ignited, and the starting heating operation is performed. Start processing.

  Subsequently, when the temperature detected by the reforming unit temperature sensor 25 is equal to or higher than the reforming start set temperature, the control unit 7 opens the raw fuel on-off valve V1, the steam on-off valve V2, and the reaction air on-off. The valve V5, the bleed air on-off valve V6 and the selective oxidation air on-off valve V7 are opened, and the reaction blower 4 and the selective oxidation blower 18 are operated to complete the start-up heating operation process. And the power generation operation process is started.

In the power generation operation process, the raw fuel control valve 21 and the reaction air control valve 35 are controlled to adjust the output power according to the power load, and the fuel gas is supplied to the fuel cell 1. The amount of bleed air and the amount of reaction air supplied are adjusted, and the amount of bleed air supplied to the fuel is adjusted by the bleed air control valve 37 so that the amount of bleed air added to the fuel gas becomes a set ratio. It adjusts according to the supply amount of the fuel gas to the said fuel cell 1 adjusted with the control valve 21. FIG.
In the power generation operation process, when the temperature detected by the reforming section temperature sensor 25 falls below the reforming set temperature (for example, 700 ° C.), the burner fuel on-off valve V3 is opened and the reforming operation is performed. The burner fuel adjustment valve 31 is controlled so that the temperature detected by the mass part temperature sensor 25 becomes the reforming set temperature. Therefore, the reforming unit 16 is heated by the reforming burner 15 so as to be maintained at the set temperature for reforming.

  When the stop command is instructed by the operation switch, the control unit 7 maintains the open state of the steam on-off valve V2, and the raw fuel on-off valve V1, the burner fuel on-off valve V3, The reaction air on-off valve V5, the bleed air on-off valve V6, and the selective oxidation air on-off valve V7 are closed, and the reaction blower 4, the selective oxidation blower 18, and the combustion blower 27 are stopped. Then, the power generation operation process is terminated, and the stop-time steam replacement process of the normal time stop process is started.

Subsequently, when the temperature detected by the reforming unit temperature sensor 25 reaches the replacement set temperature, the control unit 7 closes the steam on-off valve V2 and opens the raw fuel on-off valve V1. In addition, the stop-time steam replacement process is terminated, and the normal-time stop process purge process is started.
Then, the controller 7 closes the fuel cell outlet on / off valve V4 when the first set time has elapsed after the start of the purge process, and when the second set time has elapsed after the valve closing, The raw fuel on-off valve V1 is closed to end the purge process.

  That is, the control unit 7, the reaction blower 4 that also serves as the drainage blower 32, the burner fuel on-off valve V 3, the drain trap 33, the reforming burner 15, etc. Is configured.

The control operation of the control unit 7 when starting the fuel cell power generation device after the normal stop process is performed will be briefly described.
In the state in which the normal time stop process is performed and the fuel cell power generation device is stopped, the open / close valves V1 to V7 are all closed, as in the case of the abnormal stop. All blowers 4, 18, and 27 for reaction, selective oxidation, and combustion are in a stopped state.

When a start command is commanded by the operation switch, the control unit 7 executes the normal start operation process. During the normal start operation process, the temperature detected by the reforming unit temperature sensor 25 is increased. When the reforming start set temperature is reached, the power generation operation process is executed in the same manner as the control operation when the abnormal stop is performed.
In addition, when the stop command is issued by the operation switch while the power generation operation process is being executed, the control unit 7 stops the normal operation in the same manner as the control operation when the abnormal stop is performed. Execute the process.

  Hereinafter, the second and third embodiments of the present invention will be described. However, the same constituent elements as those of the first embodiment and the constituents having the same actions are denoted by the same reference numerals in order to avoid redundant description. The description is omitted, and a configuration different from the first embodiment will be mainly described.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described based on the drawings.
As shown in FIG. 3, in the second embodiment, in addition to the configuration of the first embodiment, the air blown from the drainage blower 32 to the fuel gas supply path 2 is replaced with the fuel cell 1. It differs from the first embodiment in that a battery bypass flow state switching means S that can be switched to a battery bypass flow state that is bypassed and flows through the fuel electrode exhaust gas passage 26 is provided.

Hereinafter, the battery bypass flow state switching means S will be described.
As shown in FIG. 3, the battery bypass circuit 38 is provided in a state of being connected to the fuel gas supply path 2 at a position lower than the connection position of the bleed air supply path 5 and the fuel electrode exhaust gas path 26. The battery bypass circuit 38 is provided with a battery bypass circuit opening / closing valve V8, and a battery upper-side opening / closing valve V9 is provided at a position lower than the connection position of the battery bypass circuit 38 in the fuel gas supply path 2, and the fuel electrode A battery lower side on-off valve V10 is provided at a location on the upper side of the exhaust gas passage 26 with respect to the connection location of the battery bypass circuit 38.

When the battery upper side open / close valve V9 and the battery lower side open / close valve V10 are opened and the battery bypass circuit open / close valve V8 is closed, the fluid flowing through the fuel gas supply path 2 is The fuel cell 1 is passed through, and the fuel electrode exhaust gas passage 26 is passed. The battery upper side on-off valve V9 and the battery lower side on-off valve V10 are closed, and the battery bypass circuit is closed. In the state where the on-off valve V8 is opened, the fluid flowing through the fuel gas supply path 2 bypasses the fuel cell 1 and enters the battery bypass flow state where the fuel electrode exhaust gas path 26 flows. .
That is, the battery bypass circuit state switching means S is constituted by the battery bypass circuit opening / closing valve V8, the battery upper side opening / closing valve V9, and the battery lower side opening / closing valve V10.

  Also in the second embodiment, as in the first embodiment, when the fuel cell power generation device is started when the normal time stop process is performed and the fuel cell power generation device is stopped, A normal startup operation process in which the reforming section heating process and the startup steam replacement process are sequentially performed is performed, and then the power generation operation process is performed, and the raw fuel on-off valve V1 is closed to generate power in the fuel cell 1. When the fuel cell power generation device is started after an abnormal stop is performed, the waste water treatment is performed, and then the abnormal start operation processing is performed, and then the power generation operation processing is performed. It is.

  Also in the second embodiment, similarly to the first embodiment, the control unit 7 is used to perform the drainage process, the normal start operation process, the abnormal start operation process, the power generation operation process, and the normal stop. The process and the abnormal stop process are automatically performed.

  Also in the second embodiment, similarly to the first embodiment, the control unit 7 is stopped at the time of abnormal operation in which the raw fuel on-off valve V1 is closed to stop the power generation of the fuel cell 1. When an activation command is issued to activate the fuel cell power generation device after being broken, the drainage treatment is performed by executing the drainage fan operating process, and then the heating operation process for activation is performed. It is configured to execute the start-up operation process at the time of abnormality.

Hereinafter, based on the time chart shown in FIG. 4, the control operation of the control unit 7 when starting the fuel cell power generator after the abnormal stop is described.
In the state in which the fuel cell power generation device is stopped due to the stop when the abnormality occurs, all the on-off valves V1 to V10 are closed, and all of the reaction, the selective oxidation and the combustion are used. Blowers 4, 18, and 27 are in a stopped state.

When the control unit 7 stores the fact that it is in the abnormal stop state, and when a start command is commanded by the operation switch, the fuel cell outlet on-off valve V4, the bleed air on-off valve V6, The drainage blower that opens the battery bypass circuit opening / closing valve V8 and operates the reaction blower 4 that also serves as the drainage blower 32, and maintains the state until the set time for wastewater treatment elapses. Perform the activation process.
In the wastewater blower operation process, the control unit 7 controls the bleed air control valve 37 under the wastewater treatment control conditions.

  That is, the battery upper side open / close valve V9 and the battery lower side open / close valve V10 are closed, and the battery bypass circuit open / close valve V8 is opened, so that the battery bypass flow state switching means S is connected to the battery bypass. Switch to the flow state.

  Subsequently, when the set time for wastewater treatment elapses, the control unit 7 closes the bleed air on-off valve V6 and the battery bypass circuit on-off valve V8 and also serves as the drainage blower 32. The blower 4 is stopped, the drainage blower operation processing is terminated, the burner fuel on-off valve V3 is opened, the combustion blower 27 is activated, the ignition device is activated, and the reforming burner 15 is ignited. Then, the starting heating operation process is started.

Subsequently, when the temperature detected by the reforming unit temperature sensor 25 becomes equal to or higher than the reforming start set temperature, the control unit 7 opens the raw fuel on-off valve V1, the steam on-off valve V2, and the reaction air on-off. The valve V5, the bleed air on-off valve V6, the selective oxidation air on-off valve V7, the battery upper side on-off valve V9 and the battery lower side on-off valve V10 are opened, and the reaction blower 4 and the selective oxidation on-off valve V10 are opened. The blower 18 is operated to end the start-up heating operation process and start the power generation operation process.
That is, the battery upper side open / close valve V9 and the battery lower side open / close valve V10 are opened, the battery bypass circuit open / close valve V8 is closed, and the battery bypass flow state switching means S is connected to the battery flow. Switch to state.

In the power generation operation process, the raw fuel control valve 21 and the reaction air control valve 35 are controlled to adjust the output power according to the power load, and the fuel gas is supplied to the fuel cell 1. The amount of bleed air and the amount of reaction air supplied are adjusted, and the amount of bleed air supplied to the fuel is adjusted by the bleed air control valve 37 so that the amount of bleed air added to the fuel gas becomes a set ratio. It adjusts according to the supply amount of the fuel gas to the said fuel cell 1 adjusted with the control valve 21. FIG.
Further, in the power generation operation process, when the temperature detected by the reforming section temperature sensor 25 falls below the reforming set temperature, the burner fuel on-off valve V3 is opened and the reforming section temperature sensor 25 is opened. The burner fuel regulating valve 31 is controlled so that the detected temperature becomes the reforming set temperature.

  When the stop command is issued by the operation switch during execution of the power generation operation process, the control unit 7 maintains the open state of the steam on-off valve V2 and maintains the open / close valve for raw fuel V1. The burner fuel on-off valve V3, the reaction air on-off valve V5, the bleed air on-off valve V6 and the selective oxidation air on-off valve V7 are closed, the battery bypass circuit on-off valve V8 is opened, The reaction blower 4, the selective oxidation blower 18, and the combustion blower 27 are stopped, the power generation operation process is terminated, and the normal time stop process stop steam replacement process is started.

Subsequently, when the temperature detected by the reforming unit temperature sensor 25 reaches the replacement set temperature, the control unit 7 closes the steam on-off valve V2 and opens the raw fuel on-off valve V1. In addition, the stop-time steam replacement process is terminated, and the normal-time stop process purge process is started.
Then, the controller 7 closes the fuel cell outlet on / off valve V4 when the first set time has elapsed after the start of the purge process, and when the second set time has elapsed after the valve closing, The purge process is terminated by closing the raw fuel on-off valve V1, the battery bypass circuit on-off valve V8, the battery upper-side on-off valve V9, and the battery lower-side on-off valve V10.

  That is, the control unit 7, the reaction blower 4 that also serves as the drainage blower 32, the burner fuel on-off valve V 3, the drain trap 33, the reforming burner 15, the battery bypass flow state switching means S, etc. Thus, a restart device of the fuel cell power generator is configured.

[Third Embodiment]
The third embodiment of the present invention will be described below based on the drawings.
As shown in FIG. 5, in the third embodiment, in addition to the configuration of the first embodiment, the air blown from the drainage blower 32 to the fuel gas supply path 2 is changed into the fuel cell 1. It differs from the first embodiment in that a battery bypass flow state switching means S that can be switched to a battery bypass flow state that is bypassed and flows through the fuel electrode exhaust gas passage 26 is provided.
Further, in the third embodiment, in addition to the configuration of the first embodiment, the drainage that can be switched to the drainage flow state for supplying the air from the selective oxidation blower 18 to the fuel gas supply path 2. It differs from 1st Embodiment also in the point which is provided with the use flow state switching means T, and is configured so that the selective oxidation fan 18 is also used as the drainage fan 32.

  As shown in FIG. 5, the battery bypass flow state switching means S is similar to the second embodiment in that the battery bypass circuit on-off valve V8, the battery upper side on-off valve V9, and the battery lower side on-off valve It is comprised by V10.

The drainage flow state switching means T will be described below.
A drainage air supply path 39 branched from the selective oxidation air supply path 19 is connected to the fuel gas supply path 2, and a drainage air on-off valve V11 is provided in the drainage air supply path 39.
When the selective oxidation air on-off valve V7 is opened and the drainage air on-off valve V11 is closed, air from the selective oxidation blower 18 passes through the selective oxidation air supply path 19. In the state in which selective oxidation is supplied to the selective oxidation unit 20, the selective oxidation air on / off valve V7 is closed, and the drainage air on / off valve V11 is opened, the selective oxidation is performed. The air from the blower 18 enters the drainage flow state in which the air is supplied to the fuel gas supply path 2 through the drainage air supply path 39.
That is, the drainage flow state switching means T is constituted by the selective oxidation air on-off valve V7 and the drainage air on-off valve V11.

  In the third embodiment, as in the first embodiment, when the fuel cell power generation device is started when the normal time stop process is performed and the fuel cell power generation device is stopped, A normal startup operation process in which the reforming section heating process and the startup steam replacement process are sequentially performed is performed, and then the power generation operation process is performed, and the raw fuel on-off valve V1 is closed to generate power in the fuel cell 1. When the fuel cell power generation device is started after an abnormal stop is performed, the waste water treatment is performed, and then the abnormal start operation processing is performed, and then the power generation operation processing is performed. It is.

  Also in the third embodiment, similarly to the first embodiment, the control unit 7 is used to perform the drainage process, the normal start operation process, the abnormal start operation process, the power generation operation process, and the normal stop. The process and the abnormal stop process are automatically performed.

  Also in the third embodiment, similarly to the first embodiment, the control unit 7 is stopped at the time of abnormality in which the fuel cell 1 is stopped by closing the raw fuel on-off valve V1. When an activation command is issued to activate the fuel cell power generation device after being broken, the drainage treatment is performed by executing the drainage fan operating process, and then the heating operation process for activation is performed. It is configured to execute the start-up operation process at the time of abnormality.

Hereinafter, based on the time chart shown in FIG. 6, the control operation of the control unit 7 when starting the fuel cell power generator after the abnormal stop has been performed will be described.
In the state in which the fuel cell power generator is stopped due to the stop at the time of abnormality, all the on-off valves V1 to V11 are closed, and all of the reaction, the selective oxidation and the combustion are used. Blowers 4, 18, and 27 are in a stopped state.

When the control unit 7 stores the fact that the engine is stopped at the time of an abnormality and a start command is commanded by the operation switch, the fuel cell outlet on-off valve V4 and the battery bypass circuit on-off valve V8. And the drainage air on-off valve V11 is opened, the selective oxidation blower 18 that also serves as the drainage blower 32 is operated, and the state is maintained until the set time for wastewater treatment elapses. The blower operation process is executed.
That is, the battery upper side open / close valve V9 and the battery lower side open / close valve V10 are closed, and the battery bypass circuit open / close valve V8 is opened, so that the battery bypass flow state switching means S is connected to the battery bypass. Switch to the flow state.
The selective oxidation air on-off valve V7 is closed, and the drainage air on-off valve V11 is opened, so that the drainage flow state switching means T is switched to the drainage flow state.

  Subsequently, when the set time for wastewater treatment elapses, the control unit 7 closes the battery bypass circuit on-off valve V8 and the drainage air on-off valve V11 and performs the selective oxidation that also serves as the drainage blower 32. The blower 18 is stopped, the drainage blower operation processing is terminated, the burner fuel on-off valve V3 is opened, the combustion blower 27 is activated, and the ignition device is activated, so that the reforming burner 15 is The start-up heating operation process is started by igniting.

Subsequently, when the temperature detected by the reforming unit temperature sensor 25 becomes equal to or higher than the reforming start set temperature, the control unit 7 opens the raw fuel on-off valve V1, the steam on-off valve V2, and the reaction air on-off. The valve V5, the bleed air on-off valve V6, the selective oxidation air on-off valve V7, the battery upper side on-off valve V9 and the battery lower side on-off valve V10 are opened, and the reaction blower 4 and the selective oxidation on-off valve V10 are opened. The blower 18 is operated to end the start-up heating operation process and start the power generation operation process.
That is, the selective oxidation air on-off valve V7 is opened, the drainage air on-off valve V11 is closed, and the drainage flow state switching means T is switched to the selective oxidation flow state. .
Further, the battery upper side open / close valve V9 and the battery lower side open / close valve V10 are opened, the battery bypass circuit open / close valve V8 is closed, and the battery bypass flow state switching means S is connected to the battery flow. Switch to state.

In the power generation operation process, the raw fuel control valve 21 and the reaction air control valve 35 are controlled to adjust the output power according to the power load, and the fuel gas is supplied to the fuel cell 1. The amount of bleed air and the amount of reaction air supplied are adjusted, and the amount of bleed air supplied to the fuel is adjusted by the bleed air control valve 37 so that the amount of bleed air added to the fuel gas becomes a set ratio. It adjusts according to the supply amount of the fuel gas to the said fuel cell 1 adjusted with the control valve 21. FIG.
Further, in the power generation operation process, when the temperature detected by the reforming section temperature sensor 25 falls below the reforming set temperature, the burner fuel on-off valve V3 is opened and the reforming section temperature sensor 25 is opened. The burner fuel regulating valve 31 is controlled so that the detected temperature becomes the reforming set temperature.

  When the stop command is issued by the operation switch during execution of the power generation operation process, the control unit 7 maintains the open state of the steam on-off valve V2 and maintains the open / close valve for raw fuel V1. The burner fuel on-off valve V3, the reaction air on-off valve V5, the bleed air on-off valve V6 and the selective oxidation air on-off valve V7 are closed, the battery bypass circuit on-off valve V8 is opened, The reaction blower 4, the selective oxidation blower 18, and the combustion blower 27 are stopped, the power generation operation process is terminated, and the normal time stop process stop steam replacement process is started.

Subsequently, when the temperature detected by the reforming unit temperature sensor 25 reaches the replacement set temperature, the control unit 7 closes the steam on-off valve V2 and opens the raw fuel on-off valve V1. In addition, the stop-time steam replacement process is terminated, and the normal-time stop process purge process is started.
Then, the controller 7 closes the fuel cell outlet on / off valve V4 when the first set time has elapsed after the start of the purge process, and when the second set time has elapsed after the valve closing, The purge process is terminated by closing the raw fuel on-off valve V1, the battery bypass circuit on-off valve V8, the battery upper-side on-off valve V9, and the battery lower-side on-off valve V10.

  That is, the control unit 7, the selective oxidation blower 18 that also serves as the drainage blower 32, the burner fuel on-off valve V 3, the drain trap 33, the reforming burner 15, and the battery bypass flow state switching means S The drainage flow state switching means T and the like constitute a restart device for the fuel cell power generator.

[Another embodiment]
Next, another embodiment will be described.
(A) In each of the first and second embodiments described above, when the bleed blower 6 is also used as the drainage blower 32, the reaction blower 4 is also used as the bleed blower 6. However, the bleed blower 6 may be provided exclusively for use as the drainage blower 32, and the dedicated bleed blower 6 may also be used as the drainage blower 32.

(B) In each of the first and second embodiments, the bleed blower 6 is also used as the drainage blower 32. In the third embodiment, the selective oxidation blower 18 is also used as the drainage blower 32. Although illustrated about the case where it does, you may comprise so that the combustion air blower 27 may be combined with the air blower 32 for drainage.
Further, the drainage blower 32 may be provided exclusively without being shared with other blowers.

(C) In each of the first and second embodiments described above, the bleed air supply path 5, the bleed air on-off valve V6, and the bleed air control valve 37 are omitted, thereby allowing the fuel gas supply path 2 to flow. A structure for adding air for oxidizing the carbon monoxide contained in the fuel gas to the fuel gas to be omitted may be omitted, and a dedicated drainage blower 32 may be provided.

(D) In the third embodiment, the battery bypass flow state switching means S may be omitted.

(E) In the third embodiment, the bleed air supply path 5, the bleed air on-off valve V6, and the bleed air control valve 37 are omitted, and the fuel flows through the fuel gas supply path 2. The configuration for adding bleed air to the gas may be omitted.

(F) The specific configuration of the battery bypass flow state switching means S is not limited to the configuration exemplified in the second and third embodiments.
For example, a three-way valve is provided at each of the connection location between the battery bypass circuit 38 and the fuel gas supply path 2 and the connection location between the battery bypass circuit 38 and the fuel electrode exhaust gas path 26, and the two The battery bypass flow state switching means S may be constituted by a three-way valve.
The specific configuration of the drainage flow state switching means T is not limited to the configuration exemplified in the third embodiment.
For example, a three-way valve may be provided at a branch point of the drainage air supply path 39 in the selective oxidation air supply path 19, and the drainage flow state switching means T may be configured by the three-way valve.

(G) In each of the above-described embodiments, the control unit 7 is configured to execute the drainage process and the abnormal start operation process, and the fuel cell power generator is started after the abnormal stop is performed. Although the restarting method is configured to be executed by the control unit 7, the control of the operation of the drainage blower 32 and the like related to the wastewater treatment and the burner fuel on-off valve V3 and the like related to the startup operation processing at the time of abnormality It may be configured such that the operation control is performed by manual operation, and a restart method for starting the fuel cell power generation device after the abnormal stop is performed by manual operation.

(H) When a hydrocarbon-based raw fuel that does not contain a sulfur compound or has a slight sulfur compound content, the desulfurization section 12 can be omitted.
Further, the hydrocarbon-based raw fuel is not limited to the natural gas-based city gas exemplified in the above embodiment, and various kinds of fuel such as propane gas and alcohols such as methanol may be used. Is possible.

The block diagram which shows the whole structure of the fuel cell electric power generating apparatus which concerns on 1st Embodiment. The figure which shows the time chart of control operation of the fuel cell power generation device which concerns on 1st Embodiment. The block diagram which shows the whole structure of the fuel cell electric power generating apparatus which concerns on 2nd Embodiment. The figure which shows the time chart of the control action of the fuel cell electric power generating apparatus which concerns on 2nd Embodiment. The block diagram which shows the whole structure of the fuel cell electric power generating apparatus which concerns on 3rd Embodiment. The figure which shows the time chart of the control action of the fuel cell electric power generating apparatus which concerns on 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fuel cell 2 Fuel gas supply path 6 Bleed blower 7 Control means 15 Reforming burner 16 Reforming part 18 Selective oxidation fan 20 Selective oxidation part 26 Fuel electrode exhaust gas path 29 Burner fuel supply path 32 Drainage blowers 33 and 34 Drainage Means R Fuel gas generator S Battery bypass flow state switching means T Drain flow state switching means V1 Raw fuel on-off valve V3 Burner fuel on-off valve

Claims (6)

Provided with a reforming section that reforms the supplied hydrocarbon-based raw fuel and steam by heating the reforming burner to generate a reformed gas containing hydrogen gas as the main component. A fuel gas generator that generates fuel gas, and
A raw fuel on-off valve for intermittently supplying raw fuel to the fuel gas generation unit;
A fuel cell in which the fuel gas generated in the fuel gas generator is supplied to the fuel electrode through a fuel gas supply path to generate electricity;
A fuel electrode exhaust gas passage for supplying fuel reformer exhaust gas discharged from the fuel electrode of the fuel cell to the reforming burner;
A fuel cell power generation apparatus provided with a burner fuel supply path that supplies gas fuel to the reforming burner and includes an on-off valve for burner fuel,
A drainage blower for blowing air to the fuel gas supply path is provided,
A fuel cell power generator in which a drainage means for draining water flowing through the fuel electrode exhaust gas passage in association with air blown by the drainage blower is provided at a location on the reformer burner side in the fuel electrode exhaust gas passage.   Battery bypass flow state switching means capable of switching to a battery bypass flow state in which the air blown from the drainage blower to the fuel gas supply path is bypassed by the fuel cell and flows to the fuel electrode exhaust gas path. The fuel cell power generator according to claim 1 provided. A bleed blower for adding air for oxidizing carbon monoxide contained in the fuel gas to the fuel gas flowing through the fuel gas supply path is provided,
The fuel cell power generator according to claim 1 or 2, wherein the bleed blower is also used as the drainage blower. The fuel gas generation unit includes a selective oxidation unit that selectively oxidizes carbon monoxide gas in the reformed gas generated in the reforming unit with air supplied from a selective oxidation blower,
A drainage flow state switching means is provided which is switchable to a drainage flow state for supplying air from the selective oxidation blower to the fuel gas supply path,
The fuel cell power generator according to claim 1 or 2, wherein the selective oxidation blower is also used as the drainage blower. Provided with a reforming section that reforms the supplied hydrocarbon-based raw fuel and steam by heating the reforming burner to generate a reformed gas containing hydrogen gas as the main component. A fuel gas generator that generates fuel gas, and
A raw fuel on-off valve for intermittently supplying raw fuel to the fuel gas generation unit;
A fuel cell in which the fuel gas generated in the fuel gas generator is supplied to the fuel electrode through a fuel gas supply path to generate electricity;
A fuel electrode exhaust gas passage for supplying fuel reformer exhaust gas discharged from the fuel electrode of the fuel cell to the reforming burner;
A method of restarting a fuel cell power generator provided with a burner fuel supply path provided with gas fuel to the reforming burner and provided with a burner fuel on-off valve,
When the fuel cell power generation device is started after the fuel cell power generation device is started after an abnormal stop that closes the raw fuel on-off valve and stops the power generation of the fuel cell, the drainage blower that blows air to the fuel gas supply path is operated. And performing drainage treatment in which the water in the fuel gas supply passage and the fuel electrode exhaust gas passage is led to drainage means provided on the reforming burner in the fuel electrode exhaust gas passage or in the reforming burner and drained. Thereafter, the burner fuel on-off valve is opened, the gas fuel supplied through the burner fuel supply passage is burned by the reforming burner, and the reforming section is heated to a temperature at which the reforming reaction can be performed. A method for restarting a fuel cell power generator that performs startup operation processing. Provided with a reforming section that reforms the supplied hydrocarbon-based raw fuel and steam by heating the reforming burner to generate a reformed gas containing hydrogen gas as the main component. A fuel gas generator that generates fuel gas, and
A raw fuel on-off valve for intermittently supplying raw fuel to the fuel gas generation unit;
A fuel cell in which the fuel gas generated in the fuel gas generator is supplied to the fuel electrode through a fuel gas supply path to generate electricity;
A fuel electrode exhaust gas passage for supplying fuel reformer exhaust gas discharged from the fuel electrode of the fuel cell to the reforming burner;
A fuel cell power generator restarting device provided with a burner fuel supply path that supplies gas fuel to the reforming burner and is provided with a burner fuel on-off valve,
A drainage blower for blowing air to the fuel gas supply path is provided,
When the control means for controlling the operation is instructed to start the fuel cell power generator after the abnormal fuel stop is performed by closing the raw fuel on-off valve to stop the power generation of the fuel cell, The water in the fuel gas supply path and the fuel electrode exhaust gas path are introduced into the fuel gas supply path to be drained by being led to a portion on the reformer burner side in the fuel electrode exhaust gas path or a drain means provided in the reformer burner. A gas supplied to the reformer burner through the burner fuel supply passage by performing drainage blower operation processing for operating the drainage blower so as to blow, and then opening the burner fuel on-off valve. A restart device for a fuel cell power generator configured to execute a starting heating operation process in which fuel is burned and the reforming section is heated to a temperature at which a reforming reaction is possible.

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