JP2020070213A - Reforming system - Google Patents

Abstract

To provide a reforming system capable of rapidly raising temperature of a reforming part when a reforming device is activated.SOLUTION: A reforming system 2 includes: a reforming device 7 that includes a reforming part 14 for decomposing an ammonia gas into hydrogen to produce a reformed gas containing the hydrogen, and a burning part 15 for burning the ammonia gas to produce a combustion gas; ammonia gas passages 16, 20 through which the ammonia gas to be supplied to the reforming part 14 and the burning part 15 flow; air passages 17, 21 through which air to be supplied to the reforming part 14 and the burning part 15 flow; air on-off valves 19, 23, provided on the air passages 17, 21, for opening/closing the air passages 17, 21; and a controlling unit 12 for controlling the air on-off valves 19, 23, wherein the controlling unit 12 controls the air on-off valves 19, 23 to be opened when the reforming device 7 is activated, and thereafter controls the air on-off valves 19 to be closed when the temperature of the reforming part 14 becomes equal to or higher than a steady operation temperature.SELECTED DRAWING: Figure 1

Description

  The present invention relates to reforming systems.

  As a conventional reforming system, for example, the technique described in Patent Document 1 is known. The reforming system described in Patent Document 1 is mainly configured by a heat exchange reformer that generates a hydrogen-containing reformed gas to be supplied to a fuel cell. The heat exchange reformer carries a reforming catalyst, and carries a reforming section for producing a reformed gas containing hydrogen gas by catalytically reacting a hydrocarbon gas and steam, and an oxidation catalyst for combustion. The reforming section includes a heating section that supplies heat for performing the reforming reaction. A raw material pump for supplying a hydrocarbon gas to the reforming section is connected to the reforming section via a raw material supply line. A gas mixer that mixes the cooling off gas with the anode off gas from the anode of the fuel cell is connected to the heating unit.

JP, 2007-290901, A

  However, in the above-mentioned conventional technology, since the combustion heat generated in the heating section of the reformer is supplied to the reforming section, the temperature rise of the reforming section is slow at the time of starting the reformer, and the reformer cannot be started. It takes time.

  An object of the present invention is to provide a reforming system that can quickly raise the temperature of the reforming section when the reformer is started.

  A reforming system according to an aspect of the present invention includes a reforming unit that decomposes a fuel gas into hydrogen to generate a hydrogen-containing reformed gas, and a fuel gas that burns the fuel gas to generate a combustion gas. A reformer having a combustion unit that supplies combustion heat to the reforming unit, a fuel gas flow path through which the fuel gas supplied to the reforming unit and the combustion unit flows, and an oxidizing gas supplied to the reforming unit are provided. A flowing first oxidizing gas flow path, a second oxidizing gas flow path through which the oxidizing gas supplied to the combustion section flows, a reformed gas flow path through which the reformed gas generated by the reforming section flows, A combustion gas flow path through which the combustion gas generated by the section flows, a first opening / closing valve arranged in the first oxidizing gas flow path to open and close the first oxidizing gas flow path, and a second oxidizing gas flow path Second opening / closing valve for opening / closing the second oxidizing gas passage, the first opening / closing valve and the second opening / closing valve And an opening / closing valve control unit for controlling the valve, the opening / closing valve control unit controls the first opening / closing valve and the second opening / closing valve to open when the reformer is activated, and then the temperature of the reforming unit is controlled. When the temperature exceeds a predetermined temperature, the first opening / closing valve is controlled to be closed.

  In such a reforming system, when the reformer is activated, the first opening / closing valve and the second opening / closing valve open, so that the oxidizing gas is supplied to both the reforming section and the combustion section of the reformer. It Therefore, the fuel gas burns in both the reforming section and the combustion section. Therefore, the combustion heat of the fuel gas generated in the combustion section is supplied to the reforming section, the temperature of the reforming section rises, and the temperature of the reforming section also increases due to the combustion heat of the fuel gas generated in the reforming section itself. To rise. As a result, the reforming unit reforms with the combustion heat of the fuel gas generated in the combustion unit and the combustion heat of the fuel gas generated in the reforming unit itself. After that, when the temperature of the reforming section becomes equal to or higher than a predetermined temperature, the first opening / closing valve closes, so that the oxidizing gas is supplied only to the combustion section, and the fuel gas burns only in the combustion section. As a result, the reforming unit reforms with the combustion heat of the fuel gas generated in the combustion unit. Thus, when the reformer is started, not only the combustion heat of the fuel gas generated in the combustion section is supplied to the reforming section, but also the combustion heat of the fuel gas is generated in the reforming section itself. Will heat up early.

  The reforming system further includes a temperature detection unit that detects the temperature of the reforming unit, and the opening / closing valve control unit opens the first opening / closing valve when the temperature of the reforming unit detected by the temperature detection unit becomes equal to or higher than a predetermined temperature. It may be controlled to close. With such a configuration, it is possible to easily and accurately determine whether the temperature of the reforming section is equal to or higher than a predetermined temperature.

  The reforming system includes a fuel removing unit that removes fuel contained in the reformed gas flowing through the reformed gas passage, a catalyst that removes fuel contained in the combustion gas flowing through the combustion gas passage, and a reformed gas passage. And a switching valve control unit for controlling the switching valve, the switching valve switching between a main route for supplying the reformed gas to the fuel removing unit and a sub route for supplying the reformed gas to the catalyst. The valve control unit may control the switching valve to switch from the sub route to the main route when the temperature of the reforming unit becomes equal to or higher than a predetermined temperature. In such a configuration, since the reformed gas generated by the reforming unit is supplied to the catalyst until the temperature of the reforming unit becomes equal to or higher than the predetermined temperature, it is difficult to supply the reformed gas to the fuel removing unit. .. Therefore, the total amount of fuel removed by the fuel removal unit is reduced, and the fuel removal unit can be downsized.

  A fuel cell to which the reformed gas from which the fuel has been removed by the fuel removal section and the oxidizing gas are supplied may be connected to the fuel removal section. With such a configuration, the reforming system can be effectively used for the fuel cell system.

  According to the present invention, it is possible to quickly raise the temperature of the reforming section when the reformer is started.

It is a schematic block diagram which shows the fuel cell system provided with the reforming system which concerns on 1st Embodiment of this invention. 6 is a flowchart showing details of a control processing procedure executed by the control unit shown in FIG. 1. 3 is a timing diagram showing an operation of the fuel cell system shown in FIG. 1. FIG. It is a schematic block diagram which shows the fuel cell system provided with the reforming system which concerns on 2nd Embodiment of this invention. 5 is a flowchart showing details of a control processing procedure executed by the control unit shown in FIG. 4.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or equivalent elements will be denoted by the same reference symbols, without redundant description.

  FIG. 1 is a schematic configuration diagram showing a fuel cell system including a reforming system according to a first embodiment of the present invention. In FIG. 1, the fuel cell system 1 is mounted in, for example, a fuel cell vehicle. The fuel cell system 1 includes the reforming system 2 of this embodiment and a fuel cell 3.

  The reforming system 2 includes an ammonia tank 4, a vaporizer 5, an air supply unit 6, a heat exchange reformer 7, a heater 8, an ammonia remover 9, a catalyst 10, and a temperature sensor 11. , And a control unit 12.

The ammonia tank 4 is a tank for storing ammonia (NH ₃ ) which is a fuel in a liquid state. The vaporizer 5 is connected to the ammonia tank 4 via the ammonia flow path 13. The vaporizer 5 vaporizes liquid-state ammonia led from the ammonia tank 4 by a pump (not shown) to generate ammonia gas (fuel gas).

  The air supply unit 6 supplies air, which is an oxidizing gas, to the reformer 7 and the fuel cell 3. As the air supply unit 6, for example, a blower or the like is used.

  The reformer 7 reforms the ammonia gas generated by the vaporizer 5 to generate a reformed gas containing hydrogen. The reformer 7 includes a reforming unit 14 including a reforming catalyst 14a that decomposes ammonia gas into hydrogen, and a combustion catalyst 15a that burns ammonia gas, and supplies the combustion heat of the ammonia gas to the reforming unit 14. And a part 15. As the reforming catalyst 14a, for example, ruthenium (Ru) or rhodium (Rh) is used. As the combustion catalyst 15a, for example, platinum (Pt) or rhodium (Rh) is used.

  The reforming section 14 and the combustion section 15 are stacked, for example, via a partition plate (not shown). The combustion heat generated in the combustion section 15 is transmitted to the reforming section 14 through the partition plate. The number of the reforming sections 14 and the number of the combustion sections 15 may be one each or plural. When the number of the reforming units 14 and the number of the combustion units 15 are each plural, the reforming units 14 and the combustion units 15 are alternately stacked.

  The reforming unit 14 is connected to the vaporizer 5 via the ammonia gas flow passage 16 (fuel gas flow passage), and the air supply unit 6 via the air flow passage 17 (first oxidizing gas flow passage). Connected with. The ammonia gas flow path 16 is a flow path through which the ammonia gas supplied to the reforming section 14 flows. The air flow path 17 is a flow path through which the air supplied to the reforming section 14 flows.

  An electromagnetic fuel opening / closing valve 18 for opening / closing the ammonia gas flow path 16 is disposed in the ammonia gas flow path 16. The air passage 17 is connected to a portion of the ammonia gas passage 16 between the fuel opening / closing valve 18 and the reforming section 14. An electromagnetic air opening / closing valve 19 (first opening / closing valve) that opens / closes the air passage 17 is arranged in the air passage 17. As the fuel opening / closing valve 18 and the air opening / closing valve 19, for example, flow rate adjusting valves are used.

Ammonia gas and air are introduced into the reforming section 14. The reforming section 14 basically decomposes ammonia into hydrogen and nitrogen by the combustion heat generated in the combustion section 15 and the reforming catalyst 14a. Specifically, as shown in the following formula, decomposition reaction of ammonia occurs due to combustion heat (endothermic reaction), and reformed gas rich in hydrogen is generated. The reformed gas may contain a small amount of ammonia.
NH ₃ → 3 / 2H ₂ + 1 / 2N ₂ (A)

  The combustion unit 15 is connected to the carburetor 5 via the ammonia gas flow passage 20 (fuel gas flow passage), and is connected to the air supply unit 6 via the air flow passage 21 (second oxidizing gas flow passage). It is connected. The ammonia gas flow path 20 is a flow path through which the ammonia gas supplied to the combustion unit 15 flows. The air passage 21 is a passage through which the air supplied to the combustion unit 15 flows.

  An electromagnetic fuel opening / closing valve 22 for opening / closing the ammonia gas flow passage 20 is arranged in the ammonia gas flow passage 20. The air flow passage 21 is connected to a portion of the ammonia gas flow passage 20 between the fuel opening / closing valve 22 and the combustion section 15. An electromagnetic air opening / closing valve 23 (second opening / closing valve) is arranged in the air passage 21. As the fuel opening / closing valve 22 and the air opening / closing valve 23, for example, flow rate adjusting valves are used.

Ammonia gas and air are introduced into the combustion section 15. The combustion unit 15 generates combustion heat by oxidizing ammonia with the combustion catalyst 15a. Specifically, as shown in the following formula, a part of ammonia chemically reacts with oxygen in the air, and combustion heat is generated by the oxidation reaction of the ammonia (exothermic reaction). Such an exothermic reaction produces a combustion gas containing nitrogen and water. The combustion gas may contain a small amount of ammonia.
NH ₃ + 3 / 4O ₂ → 1 / 2N ₂ + 3 / 2H ₂ O (B)

  The heater 8 heats the reforming unit 14 and the combustion unit 15 when the fuel cell system 1 including the reformer 7 is activated. As the heater 8, for example, an electric heater or the like is used. Instead of directly heating the reformer 7 with the heater 8, the ammonia gas supplied to the reforming section 14 and the combustion section 15 may be heated and the reformer 7 may be heated by the heat.

  The ammonia remover 9 is connected to the reforming unit 14 via the reformed gas flow path 24. The reformed gas passage 24 is a passage through which the reformed gas generated by the reforming unit 14 flows. The ammonia remover 9 is a fuel removing unit that removes ammonia, which is the fuel contained in the reformed gas flowing through the reformed gas passage 24. The ammonia remover 9 removes ammonia by, for example, adsorbing, occluding or selectively oxidizing it. The ammonia remover 9 may remove not only ammonia but also water.

  The catalyst 10 is connected to the combustion section 15 via the combustion gas flow path 25. The combustion gas passage 25 is a passage through which the combustion gas generated by the combustion unit 15 flows. The catalyst 10 removes ammonia, which is the fuel contained in the combustion gas flowing through the combustion gas passage 25. For example, platinum (Pt) or the like is used as the catalyst 10. The combustion gas from which ammonia has been removed by the catalyst 10 is discharged into the atmosphere.

  The temperature sensor 11 is a temperature detection unit that detects the temperature of the reforming unit 14. The temperature sensor 11 detects, for example, the temperature of the reforming catalyst 14a.

  The control unit 12 is composed of a CPU, a RAM, a ROM, an input / output interface and the like. The control unit 12 is an open / close valve control unit that performs a predetermined process based on the detection signal of the temperature sensor 11 and controls the fuel open / close valves 18 and 22 and the air open / close valves 19 and 23. Specific control processing by the control unit 12 will be described in detail later.

  The fuel cell 3 is connected to the ammonia remover 9 via the reformed gas flow path 26 and is also connected to the air supply unit 6 via the air flow path 27. The fuel cell 3 generates electricity by chemically reacting hydrogen contained in the reformed gas from which ammonia has been removed with oxygen in the air. As the fuel cell 3, for example, a polymer electrolyte fuel cell (PEFC) is used. The fuel cell 3 may be a solid oxide type or alkaline type fuel cell or the like.

  FIG. 2 is a flowchart showing details of the control processing procedure executed by the control unit 12. Note that this process is executed when an ignition switch (not shown) is turned on. Before execution of this process, the fuel opening / closing valves 18 and 22 and the air opening / closing valves 19 and 23 are both closed.

  In FIG. 2, the control unit 12 first acquires the detection value of the temperature sensor 11 (step S101). Subsequently, the control unit 12 determines whether the temperature of the reforming section 14 detected by the temperature sensor 11 is equal to or higher than the starting temperature (step S102). The starting temperature is a temperature at which the reformer 7 is started and ammonia reacts with air in the reforming section 14 and the combustion section 15 to be combustible. The starting temperature is, for example, about 200 ° C.

  When the control unit 12 determines that the temperature of the reforming unit 14 is not equal to or higher than the starting temperature, the control unit 12 executes step S101 again. When it is determined that the temperature of the reforming section 14 is equal to or higher than the starting temperature, the control unit 12 controls to open the fuel opening / closing valves 18 and 22 and the air opening / closing valves 19 and 23 (step S103). As a result, the ammonia gas and the air are supplied to the reforming section 14 and the combustion section 15 of the reformer 7, respectively.

  Then, the control unit 12 acquires the detection value of the temperature sensor 11 (step S104). Subsequently, the control unit 12 determines whether or not the temperature of the reforming unit 14 detected by the temperature sensor 11 is equal to or higher than the steady operation temperature (predetermined temperature) (step S105). The steady operation temperature is a temperature at which the reforming unit 14 is normally operated. The steady operation temperature is a temperature higher than the starting temperature (for example, about 400 ° C to 500 ° C).

  When the control unit 12 determines that the temperature of the reforming unit 14 is not equal to or higher than the steady operating temperature, the control unit 12 executes the procedure S104 again. When the control unit 12 determines that the temperature of the reforming unit 14 is equal to or higher than the steady operating temperature, the control unit 12 controls to close the air opening / closing valve 19 while keeping the air opening / closing valve 23 open (step S106). As a result, the air supply to the combustion section 15 is continued, but the air supply to the reforming section 14 is stopped.

  FIG. 3 is a timing chart showing the operation of the fuel cell system 1. In FIG. 3, when the ignition switch (not shown) is turned on (see time t1 in the figure), the operation of the fuel cell system 1 is started. Then, the heater 8 heats the reforming section 14 and the combustion section 15 of the reformer 7, so that the temperatures of the reforming section 14 and the combustion section 15 rise.

  When the temperature of the reforming section 14 reaches the starting temperature (see time t2 in the figure), the fuel opening / closing valves 18, 22 and the air opening / closing valves 19, 23 are opened, so that the reforming section 14 and the combustion section 15 are opened. Ammonia gas and air are respectively supplied to. As a result, the combustion heat of ammonia is generated in the reforming section 14 and the combustion section 15, and the temperature of the reforming section 14 and the combustion section 15 rises due to the combustion heat. At this time, the combustion heat generated in the combustion unit 15 is supplied to the reforming unit 14, and the combustion heat is also generated in the reforming unit 14 itself. Reforming is started.

Here, in the reforming section 14, not only the endothermic reaction of the above formula (A) but also the exothermic reaction of the above formula (B) occurs. Therefore, the reformed gas containing N ₂ , H ₂ , unburned NH _3, and H ₂ O flows through the reformed gas passage 24. Further, since an exothermic reaction occurs in the combustion section 15, the combustion gas containing N ₂ , unburned NH ₃ and H ₂ O flows in the combustion gas flow path 25. In the ammonia remover 9, unburned NH ₃ and H ₂ O contained in the reformed gas are removed. Therefore, the reformed gas containing N ₂ and H ₂ is supplied to the fuel cell 3. The catalyst 10 removes unburned NH ₃ contained in the combustion gas. Therefore, N ₂ and H ₂ O are released into the atmosphere.

  After that, when the temperature of the reforming section 14 reaches the steady operating temperature (see time t3 in the figure), the air opening / closing valve 23 remains open, but the air opening / closing valve 19 closes, so that The supply of air to the quality unit 14 is stopped. As a result, the reforming unit 14 receives the combustion heat generated in the combustion unit 15 and continues the reforming.

Here, in the reforming section 14, only an endothermic reaction occurs. Therefore, the reformed gas containing N ₂ , H ₂ and unburned NH ₃ flows through the reformed gas passage 24, and H ₂ O stops flowing. In addition, a combustion gas containing N ₂ , unburned NH ₃ and H ₂ O flows through the combustion gas passage 25. A reformed gas containing N ₂ and H ₂ is supplied to the fuel cell 3. Further, N ₂ and H ₂ O are released into the atmosphere.

  As described above, in the present embodiment, when the reformer 7 is activated, the air opening / closing valves 19 and 23 are opened, so that air is supplied to both the reforming section 14 and the combustion section 15 of the reformer 7. Supplied. Therefore, the ammonia gas burns in both the reforming section 14 and the burning section 15. Therefore, the combustion heat of the ammonia gas generated in the combustion section 15 is supplied to the reforming section 14, the temperature of the reforming section 14 rises, and the reforming section 14 itself also reforms by the combustion heat of the ammonia gas generated in the reforming section 14 itself. The temperature of section 14 rises. As a result, the reforming unit 14 reforms with the combustion heat of the ammonia gas generated in the combustion unit 15 and the combustion heat of the fuel gas generated in the reforming unit 14 itself. After that, when the temperature of the reforming section 14 becomes equal to or higher than the steady operation temperature, the air opening / closing valve 19 closes, so that air is supplied only to the combustion section 15 and the ammonia gas burns only in the combustion section 15. Thereby, the reforming unit 14 reforms with the combustion heat of the ammonia gas generated in the combustion unit 15. As described above, when the reformer 7 is started, not only the combustion heat of the ammonia gas generated in the combustion section 15 is supplied to the reforming section 14, but also the combustion heat of the ammonia gas is generated in the reforming section 14 itself. The temperature of the reforming section 14 rises early. Thereby, the starting time of the reformer 7 can be shortened.

  Further, in the present embodiment, since the temperature sensor 11 that detects the temperature of the reforming unit 14 is used, it is possible to easily and accurately determine whether the temperature of the reforming unit 14 is equal to or higher than the steady operation temperature. ..

  Further, in the present embodiment, the reforming system 2 can be effectively used for the fuel cell system 1.

  FIG. 4 is a schematic configuration diagram showing a fuel cell system including a reforming system according to the second embodiment of the present invention. In FIG. 4, the reforming system 2 of the present embodiment has the electromagnetic switching valve 30 disposed in the reformed gas flow path 24, the switching valve 30 and the combustion in addition to the configuration of the first embodiment. A branch flow path 31 that connects the gas flow path 25 is provided.

  The switching valve 30 is a valve that switches between a main path for supplying the reformed gas to the ammonia remover 9 and a sub path for supplying the reformed gas to the catalyst 10. As the switching valve 30, for example, a three-way valve is used.

  Further, the reforming system 2 includes a control unit 32 instead of the control unit 12 in the above-described first embodiment. The control unit 32 has an opening / closing valve control unit 33 and a switching valve control unit 34. The opening / closing valve control unit 33 performs a predetermined process based on the detection signal of the temperature sensor 11 to control the fuel opening / closing valves 18 and 22 and the air opening / closing valves 19 and 23. The switching valve control unit 34 performs a predetermined process based on the detection signal of the temperature sensor 11 to control the switching valve 30.

  FIG. 5 is a flowchart showing details of the control processing procedure executed by the control unit 32. Before execution of this processing, the switching valve 30 is set to the sub route.

  In FIG. 5, the control unit 32 executes steps S101 to S105 shown in FIG. 2 similarly to the control unit 12 described above. Then, when the control unit 32 determines in step S105 that the temperature of the reforming section 14 is equal to or higher than the steady operating temperature, the control unit 32 controls to close the air opening / closing valve 19 while keeping the air opening / closing valve 23 open (step S106). ). As a result, the supply of air to the reforming section 14 is stopped.

  Then, the control unit 32 controls the switching valve 30 to switch from the sub route to the main route (step S107). As a result, the reformed gas generated by the reformer 14 is switched from being supplied to the catalyst 10 to being supplied to the ammonia remover 9.

  In the above, steps S101 to S106 are executed by the opening / closing valve control unit 33. The steps S105 and S107 are executed by the switching valve control unit 34.

  In such a reforming system 2, when the temperature of the reforming section 14 reaches the starting temperature, the fuel opening / closing valves 18, 22 and the air opening / closing valves 19, 23 are opened, so that the reforming section 14 and the combustion section 15 are opened. Ammonia gas and air are respectively supplied to. As a result, the temperature of the reforming section 14 immediately rises as described above, and the reforming section 14 starts reforming.

At this time, the switching valve 30 is set to the sub flow path. Therefore, the reformed gas containing N ₂ , H ₂ , unburned NH ₃ and H ₂ O is supplied to the catalyst 10 from the reformed gas passage 24 through the branch passage 31 and the combustion gas passage 25. It is not supplied to the ammonia remover 9. Therefore, the reformed gas is not supplied to the fuel cell 3.

  After that, when the temperature of the reforming section 14 reaches the steady operating temperature, the air opening / closing valve 19 is closed, so that the supply of air to the reforming section 14 is stopped. As a result, the reforming unit 14 receives the combustion heat generated in the combustion unit 15 and continues the reforming.

Further, when the temperature of the reforming section 14 reaches the steady operating temperature, the switching valve 30 is switched from the sub route to the main route. Therefore, the reformed gas containing N ₂ , H ₂ , unburned NH _3, and H ₂ O is supplied to the ammonia remover 9 through the reformed gas passage 24. Then, in the ammonia remover 9, unburned NH ₃ contained in the reformed gas is removed. Therefore, the reformed gas containing N ₂ and H ₂ is supplied to the fuel cell 3.

  As described above, in the present embodiment, the reformed gas generated by the reforming unit 14 is supplied to the catalyst 10 until the temperature of the reforming unit 14 becomes equal to or higher than the steady operating temperature, and the ammonia removing unit 9 is not changed. It is difficult to supply quality gas. Therefore, the total amount of ammonia removed in the ammonia remover 9 is reduced, so that the ammonia remover 9 can be downsized.

  The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the temperature sensor 11 that detects the temperature of the reforming unit 14 is provided, but the invention is not particularly limited to that form, and the reforming is performed based on, for example, the flow rate of ammonia gas, the flow rate of air, time, and room temperature. You may estimate the temperature of the part 14.

  Further, in the above-described embodiment, the fuel on / off valves 18 and 22 and the air on / off valves 19 and 23 are flow rate adjusting valves, but the invention is not particularly limited to that form and opens and closes the flow paths of ammonia gas and air. Alternatively, an ON / OFF valve may be used.

  Further, in the above embodiment, air is used as the oxidizing gas, but the form is not particularly limited, and oxygen may be used as the oxidizing gas.

  Further, although the reforming system 2 of the above embodiment is applied to the fuel cell system 1, the present invention is also applicable to a system including, for example, an ammonia engine or an ammonia gas turbine.

  Further, in the above embodiment, the ammonia gas is used as the fuel gas, but the present invention is also applicable to a reforming system using a hydrocarbon gas or the like as the fuel gas.

  2 ... Reforming system, 3 ... Fuel cell, 7 ... Reformer, 9 ... Ammonia remover (fuel removing section), 10 ... Catalyst, 11 ... Temperature sensor (temperature detecting section), 12 ... Control unit (open / close valve control) Part), 14 ... reforming part, 15 ... combustion part, 16 ... ammonia gas flow path (fuel gas flow path), 17 ... air flow path (first oxidizing gas flow path), 19 ... air opening / closing valve (first) Open / close valve), 20 ... Ammonia gas flow path (fuel gas flow path), 21 ... Air flow path (second oxidizing gas flow path), 23 ... Air open / close valve (second open / close valve), 24 ... Reformed gas flow Channel, 25 ... Combustion gas flow channel, 30 ... Switching valve, 33 ... Open / close valve control unit, 34 ... Switching valve control unit.

Claims (4)

A reforming unit that decomposes a fuel gas into hydrogen to produce a reformed gas containing the hydrogen, and a combustion unit that combusts the fuel gas to produce combustion gas and supplies combustion heat of the fuel gas to the reforming unit. A reformer having a combustion section for
A fuel gas channel through which the fuel gas supplied to the reforming section and the combustion section flows,
A first oxidizing gas flow path through which the oxidizing gas supplied to the reforming section flows,
A second oxidizing gas flow path through which the oxidizing gas supplied to the combustion section flows;
A reformed gas channel through which the reformed gas generated by the reforming section flows,
A combustion gas flow path in which the combustion gas generated by the combustion unit flows,
A first opening / closing valve which is disposed in the first oxidizing gas passage and opens and closes the first oxidizing gas passage;
A second opening / closing valve that is disposed in the second oxidizing gas passage and opens and closes the second oxidizing gas passage;
An opening / closing valve control unit that controls the first opening / closing valve and the second opening / closing valve,
The opening / closing valve control unit controls the first opening / closing valve and the second opening / closing valve to open when the reformer is activated, and then, when the temperature of the reforming unit becomes equal to or higher than a predetermined temperature, A reforming system that controls to close the first opening / closing valve. Further comprising a temperature detection unit for detecting the temperature of the reforming unit,
The reforming system according to claim 1, wherein the opening / closing valve control unit controls to close the first opening / closing valve when the temperature of the reforming unit detected by the temperature detection unit becomes equal to or higher than the predetermined temperature. A fuel removal unit that removes fuel contained in the reformed gas flowing through the reformed gas flow path,
A catalyst for removing the fuel contained in the combustion gas flowing through the combustion gas passage,
A switching valve that is disposed in the reformed gas flow path and that switches between a main path that supplies the reformed gas to the fuel removal unit and a sub path that supplies the reformed gas to the catalyst;
Further comprising a switching valve control unit for controlling the switching valve,
The reforming system according to claim 1, wherein the switching valve control unit controls the switching valve to switch from the sub route to the main route when the temperature of the reforming unit becomes equal to or higher than the predetermined temperature.   The reforming system according to claim 3, wherein a fuel cell to which the reformed gas from which the fuel has been removed by the fuel removal section and the oxidizing gas are supplied is connected to the fuel removal section.

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