JP7447741B2 - reforming system - Google Patents

Description

The present invention relates to a reforming system.

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 configured with a heat exchange type reformer as a main component that generates a hydrogen-containing reformed gas to be supplied to a fuel cell. A heat exchange reformer has a reforming section that supports a reforming catalyst and generates reformed gas containing hydrogen gas by catalytically reacting hydrocarbon gas and steam, and an oxidation catalyst for combustion. , and a heating section that supplies heat for the reforming section to carry out the reforming reaction. A raw material pump that supplies 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 and the anode off-gas from the anode of the fuel cell is connected to the heating section.

Japanese Patent Application Publication No. 2007-290901

However, in the above conventional technology, since the combustion heat generated in the heating section of the reformer is supplied to the reforming section, the temperature of the reforming section is slow to rise when the reformer is started, and it takes time to start the reformer. becomes long. Furthermore, since the flow rates of the gases supplied to the heating section and the reforming section are not controlled, it is not possible to supply appropriate flow rates of gas to the heating section and the reforming section.

An object of the present invention is to provide a reforming system that can supply a suitable flow rate of fuel gas to a combustor and a reformer while shortening the startup time of the reformer.

A reforming system according to one aspect of the present invention includes a combustor that combusts fuel gas to generate combustion gas, and a reformer that generates hydrogen-containing reformed gas by reforming the fuel gas. , a combustion gas flow path that connects the combustor and the reformer, through which combustion gas flows from the combustor to the reformer; and an oxidizing gas supply section that supplies oxidizing gas to the combustor and the reformer. , a first fuel gas supply section that supplies fuel gas to the combustor, a second fuel gas supply section that supplies fuel gas to the reformer, an oxidizing gas supply section, a first fuel gas supply section, and a second fuel gas supply section. and a control unit that controls the gas supply unit, the second fuel gas supply unit is connected to the combustion gas flow path, and the control unit controls the oxidizing gas to the combustor and the reformer at the time of startup of the reformer. A first control process of controlling the oxidizing gas supply unit to supply gas, and controlling the first fuel gas supply unit and the second fuel gas supply unit to supply fuel gas to the combustor and the reformer. After executing the first control process, a second control process is executed to control the first fuel gas supply unit to stop supplying fuel gas to the combustor.

In such a reforming system, when the reformer is started, the oxidizing gas supply section supplies the oxidizing gas to the combustor and the reformer, and the first fuel gas supply section and the second fuel gas supply section also supply the oxidizing gas to the combustor and the reformer. The fuel gas is supplied to the combustor and the reformer, respectively. After that, the supply of fuel gas to the combustor by the first fuel gas supply section is stopped. When the oxidizing gas and fuel gas are supplied to the combustor and the reformer, the fuel gas is ignited and combusted in the combustor, generating combustion gas. The combustion gas is then supplied to the reformer, and the reformer is heated by the heat of the combustion gas. Then, in the reformer, the fuel gas is combusted and reformed to generate reformed gas containing hydrogen. In this way, the heat of the high-temperature combustion gas generated by burning the fuel gas in the combustor is used to cause the reformer to perform the combustion operation, so that the time required for the fuel gas to ignite in the reformer is shortened. This shortens the startup time of the reformer. Furthermore, the first fuel gas supply section supplies fuel gas to the combustor, and the second fuel gas supply section supplies fuel gas to the reformer. At this time, the second fuel gas supply section does not supply fuel gas to the combustor because it is connected to the combustion gas flow path. Therefore, the flow rate of fuel gas supplied to the combustor and reformer becomes easier to control. Thereby, appropriate flow rates of fuel gas are supplied to the combustor and reformer.

The oxidizing gas supply section is disposed in the first oxidizing gas passage through which the oxidizing gas flows toward the combustor and the first oxidizing gas passage, and is arranged in the first oxidizing gas passage to supply the oxidizing gas to the combustor and the reformer. It has a flow rate control valve that controls the flow rate of the gas, and a second oxidizing gas flow path that connects the first oxidizing gas flow path and the combustion gas flow path and allows the oxidizing gas to flow toward the reformer. , the first fuel gas supply section is connected to the first oxidizing gas flow path, and the second fuel gas supply section is connected to the combustion gas flow path directly or via the second oxidizing gas flow path. The control unit may control the flow control valve to open when executing the first control process. In such a configuration, the oxidizing gas flows through the first oxidizing gas passage and is supplied to the combustor, and the oxidizing gas flows through the second oxidizing gas passage and is supplied to the reformer. At this time, the flow rate of the oxidizing gas supplied to the combustor and the reformer is easily controlled by the flow control valve.

The pressure loss in the first oxidizing gas flow path may be smaller than the pressure loss in the second oxidizing gas flow path. In such a configuration, the flow rate of the oxidizing gas supplied to the combustor is greater than the flow rate of the oxidizing gas supplied to the reformer. Therefore, the fuel gas can be effectively burned in the combustor. Further, even if the number of flow control valves is only one, an appropriate flow rate of oxidizing gas is supplied to the combustor and the reformer.

The first fuel gas supply section has a first fuel supply valve that controls the flow rate of fuel gas supplied to the combustor, and the second fuel gas supply section controls the flow rate of fuel gas supplied to the reformer. The control unit has a second fuel supply valve to be controlled, and when executing the first control process, the control unit controls to open the first fuel supply valve and the second fuel supply valve, and executes the second control process. In this case, the first fuel supply valve may be controlled to close. In such a configuration, by controlling the opening degrees of the first fuel supply valve and the second fuel supply valve, the flow rates of the fuel gas supplied to the combustor and the reformer can be independently controlled. .

The second fuel gas supply section is connected to the combustion gas flow path directly or via a second oxidizing gas flow path, and includes a first fuel gas flow path through which fuel gas flows toward the reformer, and a first fuel gas flow path that is connected to the combustion gas flow path or through a second oxidizing gas flow path. The first fuel gas supply section includes a fuel supply valve that is disposed in the flow path and controls the flow rate of the fuel gas supplied to the combustor and the reformer, and the first fuel gas supply section includes the fuel supply valve and the first fuel gas flow. a second fuel gas flow path that connects the flow path and the first oxidizing gas flow path, through which fuel gas flows toward the combustor, and an on-off valve that opens and closes the second fuel gas flow path; When executing the first control process, the fuel supply valve and the on-off valve may be controlled to open, and when executing the second control process, the on-off valve may be controlled to be closed. In such a configuration, when the on-off valve is opened, the fuel gas flows through the second fuel gas flow path and is supplied to the combustor. When the on-off valve is closed, the supply of fuel gas to the combustor is cut off. Therefore, even with only one fuel supply valve, it is possible to switch between supplying and cutting off fuel gas to the combustor. Additionally, only one fuel supply valve is required, leading to cost reduction.

The pressure loss in the first fuel gas flow path may be smaller than the pressure loss in the second fuel gas flow path. In such a configuration, the flow rate of fuel gas supplied to the reformer is greater than the flow rate of fuel gas supplied to the combustor. Therefore, the fuel gas can be effectively reformed in the reformer. Therefore, even with only one fuel supply valve, fuel gas can be supplied to the combustor and the reformer at an appropriate flow rate.

The reforming system further includes a temperature detection unit that detects the temperature of the reformer, and the control unit performs the second control process when the temperature of the reformer detected by the temperature detection unit is equal to or higher than a specified temperature. May be executed. In such a configuration, by detecting the temperature of the reformer, it is possible to stop the supply of fuel gas to the combustor at an appropriate timing according to the temperature increase state of the reformer and with a simple control process. Can be done.

When executing the first control process, the control unit controls the oxidizing gas supply unit to supply the oxidizing gas to the combustor and the reformer, and also supplies the fuel gas to the combustor and the reformer. After controlling the first fuel gas supply section and the second fuel gas supply section so as to controlling at least one of the oxidizing gas supply section, the first fuel gas supply section and the second fuel gas supply section so as to change the flow rate of at least one of the oxidizing gas and the fuel gas; When performing this, when the temperature of the reformer detected by the temperature detection section reaches a second temperature or higher that is higher than the first temperature, the first fuel gas supply is stopped so that the supply of fuel gas to the combustor is stopped. may also be controlled. In such a configuration, when the temperature of the reformer becomes equal to or higher than the first temperature, the fuel gas and oxidizing gas flow at a flow rate ratio suitable for simultaneously performing the combustion operation in the combustor and the reforming operation in the reformer, for example. By supplying the fuel, the combustion operation and the reforming operation can be performed simultaneously, effectively and stably.

According to the present invention, an appropriate flow rate of fuel gas can be supplied to the combustor and the reformer while shortening the startup time of the reformer.

1 is a schematic configuration diagram showing a reforming system according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of the combustor shown in FIG. 1; 2 is a flowchart showing details of a control processing procedure executed by the controller shown in FIG. 1. FIG. FIG. 4 is a timing diagram showing the operation of the reforming system when the control process shown in FIG. 3 is executed. FIG. 2 is a schematic configuration diagram showing a reforming system according to a second embodiment of the present invention. 6 is a flowchart showing details of a control processing procedure executed by the controller shown in FIG. 5. FIG. FIG. 7 is a timing diagram showing the operation of the reforming system when the control process shown in FIG. 6 is executed. 8 is a timing diagram showing a modification of the operation of the reforming system shown in FIG. 7. FIG. It is a schematic block diagram which shows the reforming system based on 3rd Embodiment of this invention. 10 is a flowchart showing details of a control processing procedure executed by the controller shown in FIG. 9. FIG. FIG. 11 is a timing diagram showing the operation of the reforming system when the control process shown in FIG. 10 is executed. 12 is a timing diagram showing a modification of the operation of the reforming system shown in FIG. 11. FIG. 12 is a timing diagram showing another modification of the operation of the reforming system shown in FIG. 11. FIG.

Embodiments of the present invention will be described in detail below with reference to the drawings. In addition, in the drawings, the same or equivalent elements are given the same reference numerals, and overlapping explanations will be omitted.

FIG. 1 is a schematic configuration diagram showing a reforming system according to a first embodiment of the present invention. In FIG. 1, the reforming system 1 of this embodiment includes a combustor 2, a reformer 3, air flow paths 4 and 5, a throttle valve 6, an ammonia tank 7, a vaporizer 8, and a first It includes a fuel supply valve 10 and a second fuel supply valve 12.

The combustor 2 is a tubular flame burner that combusts ammonia gas (NH ₃ gas), which is a fuel gas, to generate combustion gas. As shown in FIG. 2, the combustor 2 includes a cylindrical casing 16, a plurality of (four in this case) gas introduction sections 17 provided in the casing 16, and a gas introduction section 17 attached to the casing 16. It has an ignition part 18 (see FIG. 1).

The gas introduction section 17 introduces a mixed gas of ammonia gas and air, which is an oxidizing gas, into the housing 16 so that a tubular flow is generated. Specifically, the gas introduction section 17 introduces the mixed gas into the housing 16 in the tangential direction of the inner circumferential surface 16a of the housing 16.

The ignition section 18 ignites the ammonia gas in the mixed gas introduced into the housing 16 from the gas introduction section 17 . The ignition unit 18 is, for example, a glow plug or a spark plug.

The reformer 3 is connected to the outlet section 2b of the combustor 2 via a combustion gas flow path 20. The combustion gas flow path 20 is a flow path through which combustion gas generated by the combustor 2 flows toward the reformer 3. Ammonia gas and air that have passed through the combustor 2 also flow through the combustion gas flow path 20 . The combustion gas flow path 20 is formed of piping. Note that the combustion gas flow path 20 may be integrated with the casing 16 of the combustor 2 instead of being a pipe connecting the combustor 2 and the reformer 3.

The reformer 3 generates a reformed gas containing hydrogen by reforming ammonia gas. The reformer 3 has a reforming catalyst 3a. In addition to the function of decomposing ammonia gas into hydrogen, the reforming catalyst 3a also has the function of combusting ammonia gas. The reforming catalyst 3a is, for example, an ATR (Autothermal Reformer) type ammonia reforming catalyst. As the reforming catalyst 3a, for example, a cobalt-based catalyst, a rhodium-based catalyst, a ruthenium-based catalyst, a palladium-based catalyst, or the like is used.

The air flow path 4 is connected to the inlet portion 2a of the combustor 2. The air flow path 4 is a flow path (first oxidizing gas flow path) through which air flows toward the combustor 2 . The air flow path 4 is formed of piping.

The air flow path 5 is branch-connected to the air flow path 4 by a branch connection portion 4a. The air flow path 5 connects the air flow path 4 and the combustion gas flow path 20 so as to bypass the combustor 2. The air flow path 5 is a flow path (second oxidizing gas flow path) through which air flows toward the reformer 3. The air flow path 5 is formed of piping.

When the reformer 3 is started, the reformer 3 uses the heat of the combustion gas generated by the combustor 2 to reform ammonia gas. Therefore, when the reformer 3 is started, the combustor 2 requires more air than the reformer 3. Therefore, the pressure loss in the air flow path 4 is smaller than the pressure loss in the air flow path 5. Specifically, the diameter of the pipe forming the air flow path 4 is larger than the diameter of the pipe forming the air flow path 5.

Further, the length of the piping forming the air flow path 4 may be shorter than the length of the piping forming the air flow path 5. The roughness of the inner wall surface of the pipe forming the air flow path 4 may be smaller than the roughness of the inner wall surface of the pipe forming the air flow path 5. It is not necessary to arrange a pressure adjustment member inside the piping forming the air flow path 5 to narrow the flow path, but to arrange a pressure adjustment member inside the piping forming the air flow path 4. In either case, the pressure loss in the air flow path 4 is smaller than the pressure loss in the air flow path 5.

The throttle valve 6 is arranged in the air flow path 4. Specifically, the throttle valve 6 is disposed on the upstream side of the branch connection portion 4a with the air flow path 5 in the air flow path 4. The throttle valve 6 is an electromagnetic flow control valve that controls the flow rate of air supplied to the combustor 2 and the reformer 3.

The air flow paths 4 and 5 and the throttle valve 6 constitute an air supply section 21 (oxidizing gas supply section) that supplies air to the combustor 2 and the reformer 3.

The ammonia tank 7 is a tank that stores ammonia in a liquid state. That is, the ammonia tank 7 stores liquid ammonia. The vaporizer 8 is connected to the ammonia tank 7 via an ammonia flow path 22. The ammonia flow path 22 is a flow path through which liquid ammonia flows from the ammonia tank 7 toward the vaporizer 8. The vaporizer 8 vaporizes liquid ammonia to generate ammonia gas. Note that the ammonia flow path 22 may be provided with a flow rate regulating valve.

The first fuel supply valve 10 is connected to the carburetor 8 via an ammonia flow path 9. The ammonia flow path 9 is a flow path through which ammonia gas flows from the vaporizer 8 to the first fuel supply valve 10 . The ammonia channel 9 is formed of piping.

The first fuel supply valve 10 is an electromagnetic injector (fuel injection valve) that controls the flow rate of ammonia gas supplied to the combustor 2 by injecting the ammonia gas toward the combustor 2 . Specifically, the first fuel supply valve 10 is attached to a pipe that forms the air flow path 4. The first fuel supply valve 10 injects ammonia gas between the branch connection portion 4 a of the air flow path 4 and the air flow path 5 and the combustor 2 .

The ammonia tank 7, the vaporizer 8, the ammonia flow path 9, and the first fuel supply valve 10 constitute a first fuel gas supply section 23 that supplies ammonia gas to the combustor 2. The first fuel gas supply section 23 is connected to the air flow path 4. The first fuel gas supply section 23 supplies ammonia gas to the combustor 2 through the air flow path 4 .

The second fuel supply valve 12 is connected to the carburetor 8 via the ammonia flow path 11. The ammonia flow path 11 is branched and connected to the ammonia flow path 9. The ammonia flow path 11 is a flow path through which ammonia gas flows from the vaporizer 8 to the second fuel supply valve 12 . The ammonia channel 11 is formed of piping.

The second fuel supply valve 12 is an electromagnetic injector that controls the flow rate of ammonia gas supplied to the reformer 3 by injecting the ammonia gas toward the reformer 3 . Specifically, the second fuel supply valve 12 is attached to a pipe that forms the air flow path 5. The second fuel supply valve 12 injects ammonia gas into a region on the downstream side (reformer 3 side) of the air flow path 5.

The ammonia tank 7, the vaporizer 8, the ammonia flow path 11, and the second fuel supply valve 12 constitute a second fuel gas supply section 24 that supplies ammonia gas to the reformer 3. The second fuel gas supply section 24 is connected to the combustion gas flow path 20 via the air flow path 5. The second fuel gas supply unit 24 supplies ammonia gas to the reformer 3 through the combustion gas passage 20 so as to avoid the combustor 2 . That is, the second fuel gas supply section 24 does not supply ammonia gas to the combustor 2.

Note that the second fuel supply valve 12 may be attached to a pipe forming the combustion gas flow path 20 and inject ammonia gas into the combustion gas flow path 20. In this case, the second fuel gas supply section 24 will be directly connected to the combustion gas flow path 20.

The reformer 3 is connected to the hydrogen utilization device 13 via a reformed gas flow path 27. The reformed gas flow path 27 is a flow path through which the reformed gas generated by the reformer 3 flows toward the hydrogen utilization device 13 . The reformed gas flow path 27 is formed of piping.

The hydrogen utilization device 13 is a device that utilizes hydrogen contained in the reformed gas. Examples of the hydrogen utilization device 13 include a combustion device such as an ammonia engine or an ammonia gas turbine using ammonia as fuel, or a fuel cell that generates power by chemically reacting hydrogen with oxygen in the air. When the hydrogen utilization device 13 is a fuel cell, unlike when the hydrogen utilization device 13 is an ammonia engine, negative pressure is not generated and air is difficult to flow. Therefore, a pump or the like is required to smoothly supply air. You may prepare.

The reforming system 1 also includes a temperature sensor 30 and a controller 31. The temperature sensor 30 is a temperature detection section that detects the temperature of the reformer 3. The temperature sensor 30 may detect the temperature of the reforming catalyst 3a of the reformer 3, or may detect the temperature of the ammonia gas supplied to the reformer 3, for example.

The controller 31 includes a CPU, RAM, ROM, input/output interface, and the like. The controller 31 constitutes a control section that controls the throttle valve 6, the first fuel supply valve 10, the second fuel supply valve 12, and the ignition section 18 of the combustor 2 based on the detected value of the temperature sensor 30.

The controller 31 controls the throttle valve 6 to supply air to the combustor 2 and the reformer 3 when the reformer 3 is started, and also controls the throttle valve 6 to supply ammonia gas to the combustor 2 and the reformer 3. A first control process for controlling the first fuel supply valve 10 and the second fuel supply valve 12 is executed.

After executing the first control process, the controller 31 executes a second control process to control the first fuel supply valve 10 to stop the supply of ammonia gas to the combustor 2. At this time, the controller 31 executes the second control process when the temperature of the reformer 3 detected by the temperature sensor 30 is equal to or higher than the specified temperature T.

FIG. 3 is a flowchart showing details of the control processing procedure executed by the controller 31. This process is executed when startup of the reformer 3 is instructed. Note that before this process is executed, the throttle valve 6, the first fuel supply valve 10, and the second fuel supply valve 12 are in a closed state.

In FIG. 3, when the controller 31 is instructed to start the reformer 3, it controls the throttle valve 6, the first fuel supply valve 10, and the second fuel supply valve 12 to open (step S101). The controller 31 also controls the ignition unit 18 of the combustor 2 to ignite (step S102).

Subsequently, the controller 31 acquires the detected value of the temperature sensor 30 (step S103). Then, the controller 31 determines whether the temperature of the reformer 3 is equal to or higher than a predetermined temperature T based on the detected value of the temperature sensor 30 (step S104). The specified temperature T is, for example, a temperature at which the temperature of the reformer 3 stabilizes the reforming operation of ammonia gas by the reforming catalyst 3a, and is higher than the reforming temperature (described later) of the reformer 3.

When the controller 31 determines that the temperature of the reformer 3 is not equal to or higher than the specified temperature T, it executes step S103 again. When the controller 31 determines that the temperature of the reformer 3 is equal to or higher than the specified temperature T, it controls the first fuel supply valve 10 to close (step S105). Further, the controller 31 controls the opening degree of the throttle valve 6 to be reduced (step S106).

Subsequently, the controller 31 determines whether a prescribed time t has elapsed since the first fuel supply valve 10 was controlled to close (step S107). When the controller 31 determines that the prescribed time t has elapsed, it controls the throttle valve 6 and the second fuel supply valve 12 to increase their opening degrees (step S108). At this time, the controller 31 controls the throttle valve 6 and the second fuel supply valve 12 so that the flow rates of ammonia gas and air become a flow rate ratio suitable for the reforming operation by the reformer 3.

Here, steps S101 and S102 correspond to the first control process described above. Steps S103 to S106 correspond to the second control process described above.

In the reforming system 1 as described above, when startup of the reformer 3 is instructed, as shown in FIGS. 4(a), (d), and (e), the throttle valve 6 and the first fuel supply valve 10 and the second fuel supply valve 12 are opened. Then, the air flows through the air flow path 4 and is supplied to the combustor 2, and the air flows through the air flow path 5 and is supplied to the reformer 3. Furthermore, ammonia gas flows through the air flow path 4 and is supplied to the combustor 2, and ammonia gas flows through the combustion gas flow path 20 and is supplied to the reformer 3.

At this time, the pressure loss in the air flow path 4 is smaller than the pressure loss in the air flow path 5. Therefore, as shown in FIGS. 4(b) and 4(c), the flow rate of air supplied to the combustor 2 is greater than the flow rate of air supplied to the reformer 3.

A mixed gas of ammonia gas and air is introduced into the housing 16 from the gas introduction part 17 in the combustor 2 . At this time, the mixed gas is introduced into the casing 16 in the tangential direction of the inner circumferential surface 16a of the casing 16, so that it forms a tubular flow inside the casing 16.

In this state, the ignition section 18 of the combustor 2 ignites the ammonia gas in the mixed gas, forming a tubular flame, and the ammonia gas begins to burn. Specifically, as shown in the formula below, ammonia and oxygen in the air undergo a chemical reaction to generate high-temperature combustion gas (exothermic reaction). The combustion gas swirls and flows through the combustion gas flow path 20 toward the reformer 3 .
_NH3 +3/ _4O2 →1/ _2N2 +3/ _2H2O ...(A)

When high temperature combustion gas is supplied to the reformer 3, the reformer 3 is directly heated by the heat of the combustion gas. Furthermore, the heat of the combustion gas heats the ammonia gas and air, and the heat of the ammonia gas and air also heats the reformer 3. Therefore, as shown in FIG. 4(f), the temperature of the reformer 3 begins to rise.

Then, when the temperature of the reformer 3 reaches a combustible temperature, the ammonia gas is combusted by the reforming catalyst 3a of the reformer 3. Then, the exothermic reaction of the above formula (A) occurs, and combustion gas is generated in the reformer 3. Then, the temperature of the reformer 3 further increases due to the heat of the combustion gas. That is, the reformer 3 comes to perform an autonomous combustion operation.

Thereafter, when the temperature of the reformer 3 reaches a reforming temperature, the ammonia gas is reformed by the reforming catalyst 3a of the reformer 3. Specifically, a decomposition reaction of ammonia occurs (endothermic reaction) as shown in the following formula, and a reformed gas containing hydrogen is generated. The reformed gas flows through the reformed gas passage 27 and is supplied to the hydrogen utilization device 13 .
NH ₃ → 3/2H ₂ + 1/2N ₂ …(B)

Thereafter, when the temperature of the reformer 3 reaches the specified temperature T, the first fuel supply valve 10 closes to stop the supply of ammonia gas to the combustor 2, as shown in FIG. 4(d). Stop. Therefore, wasteful consumption of ammonia gas is prevented.

Further, as shown in FIG. 4(a), as the opening degree of the throttle valve 6 becomes smaller, the flow rate of air supplied to the combustor 2 and the reformer 3 decreases. At this time, due to the difference in pressure loss between the air channels 4 and 5 mentioned above, as shown in FIGS. air flow rate.

Thereafter, when a predetermined time t has elapsed after the first fuel supply valve 10 is closed, the throttle valve 6 and the second As the opening degree of the fuel supply valve 12 increases, the flow rates of ammonia gas and air supplied to the reformer 3 increase. Note that the air supplied to the combustor 2 passes through the combustor 2 and is supplied to the reformer 3. At this time, ammonia gas and air are supplied to the reformer 3 at a flow rate suitable for the reforming operation. This completes the startup of the reformer 3, and the reformer 3 enters a steady state.

As described above, in this embodiment, when the reformer 3 is started, the air supply section 21 supplies air to the combustor 2 and the reformer 3, and the first fuel gas supply section 23 and the Ammonia gas is supplied to the combustor 2 and the reformer 3 by the two fuel gas supply sections 24, respectively. After that, the supply of ammonia gas to the combustor 2 by the first fuel gas supply section 23 is stopped. When ammonia gas and air are supplied to the combustor 2 and the reformer 3, the ammonia gas is ignited and combusted in the combustor 2, generating combustion gas. The combustion gas is then supplied to the reformer 3, and the reformer 3 is heated by the heat of the combustion gas. Then, in the reformer 3, the ammonia gas is combusted and reformed, and a reformed gas containing hydrogen is generated. In this way, the heat of the high-temperature combustion gas generated by burning ammonia gas in the combustor 2 is used to operate the reformer 3, so the time it takes for the ammonia gas to ignite in the reformer 3 is Becomes shorter. Thereby, the startup time of the reformer 3 is shortened. Further, the first fuel gas supply section 23 supplies ammonia gas to the combustor 2, and the second fuel gas supply section 24 supplies ammonia gas to the reformer 3. At this time, the second fuel gas supply section 24 does not supply ammonia gas to the combustor 2 because it is connected to the combustion gas flow path 20 . Therefore, the flow rate of ammonia gas supplied to the combustor 2 and the reformer 3 can be easily controlled. Thereby, ammonia gas at an appropriate flow rate is supplied to the combustor 2 and the reformer 3.

Furthermore, in this embodiment, air flows through the air flow path 4 and is supplied to the combustor 2, and air flows through the air flow path 5 and is supplied to the reformer. At this time, the flow rate of air supplied to the combustor 2 and the reformer 3 is easily controlled by the throttle valve 6.

Furthermore, in this embodiment, since the pressure loss in the air passage 4 is smaller than the pressure loss in the air passage 5, the flow rate of air supplied to the combustor 2 is lower than the flow rate of air supplied to the reformer 3. There will also be more. Therefore, the ammonia gas is effectively combusted in the combustor 2. Moreover, even if the number of throttle valves 6 is only one, air is supplied to the combustor 2 and the reformer 3 at an appropriate flow rate.

Further, in this embodiment, by controlling the opening degrees of the first fuel supply valve 10 and the second fuel supply valve 12, the flow rates of ammonia gas supplied to the combustor 2 and the reformer 3 are independently controlled. can be controlled.

Furthermore, in this embodiment, by detecting the temperature of the reformer 3 with the temperature sensor 30, the temperature of the combustor 2 is controlled at an appropriate timing according to the temperature increase state of the reformer 3 and with simple control processing. The supply of ammonia gas can be stopped.

In the present embodiment, the specified temperature T is a temperature at which the temperature of the reformer 3 stabilizes the reforming operation of ammonia gas by the reforming catalyst 3a, but it is not limited to such a form. The specified temperature T may be, for example, the reforming temperature or combustible temperature of the reformer 3.

FIG. 5 is a schematic configuration diagram showing a reforming system according to a second embodiment of the present invention. In FIG. 5, the reforming system 1A of the present embodiment includes a fuel supply valve 40 and an ON/OFF valve 41 instead of the first fuel supply valve 10 and the second fuel supply valve 12 in the first embodiment described above. It is equipped with

The fuel supply valve 40 is arranged in an ammonia flow path 42 that connects the vaporizer 8 and the combustion gas flow path 20. The ammonia flow path 42 is a flow path (first fuel gas flow path) through which ammonia gas flows from the vaporizer 8 toward the reformer 3. The ammonia channel 42 is formed of piping. The fuel supply valve 40 is an electromagnetic flow control valve that controls the flow rate of ammonia gas supplied to the combustor 2 and the reformer 3.

The ON/OFF valve 41 is arranged in an ammonia flow path 43 that connects the ammonia flow path 42 and the air flow path 4. One end of the ammonia flow path 43 is connected to a portion of the ammonia flow path 42 between the fuel supply valve 40 and the combustion gas flow path 20. The other end of the ammonia flow path 43 is connected to a portion of the air flow path 4 between the branch connection portion 4 a with the air flow path 5 and the combustor 2 . The ammonia flow path 43 is a flow path (second fuel gas flow path) through which ammonia gas flows from the vaporizer 8 toward the combustor 2 . The ammonia channel 43 is formed of piping.

The reformer 3 requires more ammonia gas than the combustor 2. Therefore, the pressure loss in the ammonia flow path 42 is smaller than the pressure loss in the ammonia flow path 43. The piping forming the ammonia flow path 42 has the same structure as the piping forming the air flow path 4, for example. The piping forming the ammonia flow path 43 has the same structure as the piping forming the air flow path 5, for example.

The ON/OFF valve 41 is an electromagnetic on-off valve that opens and closes the ammonia flow path 43. The ON/OFF valve 41 is a normally closed on-off valve that is normally closed and opens when energized.

The ammonia tank 7 , the vaporizer 8 , a part of the ammonia flow path 42 , the fuel supply valve 40 , the ammonia flow path 43 and the ON/OFF valve 41 are connected to a first fuel gas supply section 45 that supplies ammonia gas to the combustor 2 . It consists of The first fuel gas supply section 45 is connected to the air flow path 4. The first fuel gas supply unit 45 supplies ammonia gas to the combustor 2 through the air flow path 4 .

The ammonia tank 7, the vaporizer 8, the ammonia flow path 42, and the fuel supply valve 40 constitute a second fuel gas supply section 46 that supplies ammonia gas to the reformer 3. The second fuel gas supply section 46 is connected to the combustion gas flow path 20. The second fuel gas supply unit 46 supplies ammonia gas to the reformer 3 through the combustion gas passage 20 so as to avoid the combustor 2 . Note that the second fuel gas supply section 46 may not be directly connected to the combustion gas flow path 20 but may be connected to the combustion gas flow path 20 via the air flow path 5.

Furthermore, the reforming system 1A includes a controller 31A instead of the controller 31 in the first embodiment. The controller 31A constitutes a control section that controls the throttle valve 6, the fuel supply valve 40, the ON/OFF valve 41, and the ignition section 18 of the combustor 2 based on the detected value of the temperature sensor 30. The controller 31A executes the first control process and the second control process similarly to the first embodiment described above.

The controller 31A controls to open the throttle valve 6, fuel supply valve 40, and ON/OFF valve 41 when executing the first control process, and opens the ON/OFF valve 41 when executing the second control process. control to close.

FIG. 6 is a flowchart showing details of the control processing procedure executed by the controller 31A, and corresponds to FIG. 3.

In FIG. 6, when the controller 31A is instructed to start the reformer 3, it controls the throttle valve 6, the fuel supply valve 40, and the ON/OFF valve 41 to open (step S111). Then, the controller 31A executes steps S102 to S104 similarly to the first embodiment described above.

When the controller 31A determines in step S104 that the temperature of the reformer 3 is equal to or higher than the specified temperature T, the controller 31A controls the ON/OFF valve 41 to close (step S112). Further, the controller 31A controls the opening degrees of the throttle valve 6 and the fuel supply valve 40 to be small (step S113). At this time, the controller 31A controls the opening degree of the fuel supply valve 40 so that the flow rate of ammonia gas supplied to the reformer 3 does not change, for example.

Subsequently, the controller 31A determines whether a prescribed time t has elapsed since the ON/OFF valve 41 was controlled to close (step S114). When the controller 31A determines that the prescribed time t has elapsed, it controls the throttle valve 6 and the fuel supply valve 40 to increase their opening degrees (step S115). At this time, the controller 31A controls the throttle valve 6 and the fuel supply valve 40 so that the flow rates of ammonia gas and air become a flow rate ratio suitable for the reforming operation by the reformer 3.

Here, steps S111 and S102 correspond to the first control process described above. Steps S103, S104, S112, and S113 correspond to the second control process described above.

In the above, when the start-up of the reformer 3 is instructed, the ON/OFF valve 41, the throttle valve 6, and the fuel supply valve 40 are opened, as shown in FIGS. 7(a), (b), and (e). speak. Then, air flows through the air passage 4 and is supplied to the combustor 2, and at the same time, air flows through the air passage 5 and is supplied to the reformer 3. Further, ammonia gas flows through the ammonia flow paths 42 and 43 and the air flow path 4 and is supplied to the combustor 2, and at the same time, ammonia gas flows through the ammonia flow path 42 and the combustion gas flow path 20 and is supplied to the reformer 3. be done.

At this time, the pressure loss in the air flow path 4 is smaller than the pressure loss in the air flow path 5. Therefore, as shown in FIGS. 7(c) and 7(d), the flow rate of air supplied to the combustor 2 becomes larger than the flow rate of air supplied to the reformer 3. Further, the pressure loss in the ammonia flow path 42 is smaller than the pressure loss in the ammonia flow path 43. Therefore, as shown in FIGS. 7(f) and (g), the flow rate of ammonia gas supplied to the reformer 3 becomes larger than the flow rate of ammonia gas supplied to the combustor 2.

When a mixed gas of ammonia gas and air is supplied to the combustor 2, the ammonia gas is ignited and combusted, generating high-temperature combustion gas. Then, when the high-temperature combustion gas flows through the combustion gas passage 20 and is supplied to the reformer 3, the reformer 3 is heated. temperature begins to rise.

Then, when the temperature of the reformer 3 reaches a reforming temperature, the ammonia gas is reformed by the reforming catalyst 3a of the reformer 3, and a reformed gas containing hydrogen is generated. The reformed gas then flows through the reformed gas passage 27 and is supplied to the hydrogen utilization device 13.

Thereafter, when the temperature of the reformer 3 reaches the specified temperature T, the ON/OFF valve 41 closes to supply ammonia gas to the combustor 2, as shown in FIGS. supply will be stopped. Further, as shown in FIGS. 7(b) to 7(d), as the opening degree of the throttle valve 6 becomes smaller, the flow rate of air supplied to the combustor 2 and the reformer 3 decreases.

Thereafter, when a specified time t has elapsed after the ON/OFF valve 41 was closed, the opening degrees of the throttle valve 6 and the fuel supply valve 40 become larger, as shown in FIGS. 7(b) to 7(e). Then, the flow rates of ammonia gas and air supplied to the reformer 3 increase. Note that the air supplied to the combustor 2 passes through the combustor 2 and is supplied to the reformer 3. At this time, ammonia gas and air are supplied to the reformer 3 at a flow rate suitable for the reforming operation. This brings the reformer 3 into a steady state.

As described above, in this embodiment, ammonia gas is supplied to the combustor 2 by the first fuel gas supply section 45, and ammonia gas is supplied to the reformer 3 by the second fuel gas supply section 46. At this time, the second fuel gas supply section 46 does not supply ammonia gas to the combustor 2 because it is connected to the combustion gas flow path 20 . Therefore, the flow rate of ammonia gas supplied to the combustor 2 and the reformer 3 can be easily controlled. Thereby, ammonia gas can be supplied to the combustor 2 and the reformer 3 at an appropriate flow rate while shortening the startup time of the reformer 3.

Furthermore, in this embodiment, when the ON/OFF valve 41 is opened, ammonia gas flows through the ammonia flow path 43 and is supplied to the combustor 2 . Thereafter, when the ON/OFF valve 41 is closed, the supply of ammonia gas to the combustor 2 is cut off. Therefore, even if the number of fuel supply valves 40 is only one, supply and cutoff of ammonia gas to the combustor 2 can be switched. Further, since only one fuel supply valve 40 is required, costs can be reduced.

Furthermore, in this embodiment, since the pressure loss in the ammonia flow path 42 is smaller than the pressure loss in the ammonia flow path 43, the flow rate of the ammonia gas supplied to the reformer 3 is lower than that of the ammonia gas supplied to the combustor 2. It will be more than the flow rate. Therefore, the ammonia gas can be effectively reformed in the reformer 3. Therefore, even if the number of fuel supply valves 40 is only one, ammonia gas is supplied to the combustor 2 and the reformer 3 at an appropriate flow rate.

In this embodiment, a normally closed type ON/OFF valve 41 is used, but the form is not limited to this, and a normally open type ON/OFF valve 41 which is normally open and closes when energized is used. An ON/OFF valve 41 may also be used.

In this case, as shown in FIG. 8, when the temperature of the reformer 3 reaches the specified temperature T, the ON/OFF valve 41 is energized to close the valve, and after the specified time t has passed, the ON/OFF valve 41 is closed. The ON/OFF valve 41 is opened by de-energizing the /OFF valve 41 (see FIG. 8(a)). This makes it possible to save power.

FIG. 9 is a schematic configuration diagram showing a reforming system according to a third embodiment of the present invention. In FIG. 9, the reforming system 1B of this embodiment does not include the air flow path 5 in the first embodiment. The air flow path 4 and the throttle valve 6 constitute an air supply section 50 (oxidizing gas supply section) that supplies air to the combustor 2 and the reformer 3.

Furthermore, the reforming system 1B includes a controller 31B instead of the controller 31 in the first embodiment. The controller 31B constitutes a control section that controls the throttle valve 6, the first fuel supply valve 10, the second fuel supply valve 12, and the ignition section 18 of the combustor 2 based on the detected value of the temperature sensor 30. The controller 31B executes the first control process and the second control process similarly to the first embodiment described above.

When executing the first control process, the controller 31B controls the throttle valve 6 to supply air to the combustor 2 and the reformer 3, and also supplies ammonia gas to the combustor 2 and the reformer 3. After controlling the first fuel supply valve 10 and the second fuel supply valve 12 to The throttle valve 6 is controlled to change the flow rate of air supplied to the engine.

When executing the second control process, the controller 31B performs a first control process to stop supplying ammonia gas to the combustor 2 when the temperature of the reformer 3 detected by the temperature sensor 30 becomes equal to or higher than the specified temperature T2. 1 controls the fuel supply valve 10.

FIG. 10 is a flowchart showing details of the control processing procedure executed by the controller 31B, and corresponds to FIG. 3.

In FIG. 10, when the controller 31B is instructed to start the reformer 3, it executes steps S101 to S103 similarly to the first embodiment described above. Then, the controller 31B determines whether the temperature of the reformer 3 is equal to or higher than a predetermined specified temperature T1 (first temperature) based on the detected value of the temperature sensor 30 (step S121). The specified temperature T1 is, for example, the combustible temperature of the reformer 3 (described above).

When the controller 31B determines that the temperature of the reformer 3 is equal to or higher than the specified temperature T1, the controller 31B controls the throttle valve 6 to increase the opening degree (step S122). At this time, the controller 31B controls the throttle valve 6 so that the flow rates of the ammonia gas and air are at a flow rate ratio suitable for simultaneously performing the combustion operation by the combustor 2 and the reforming operation by the reformer 3.

Subsequently, the controller 31B acquires the detected value of the temperature sensor 30 (step S123). Then, the controller 31B determines whether the temperature of the reformer 3 is equal to or higher than a predetermined specified temperature T2 (second temperature) based on the detected value of the temperature sensor 30 (step S124). The specified temperature T2 is a temperature higher than the specified temperature T1. The specified temperature T2 is, for example, the temperature of the reformer 3 at which the reforming operation of ammonia gas by the reforming catalyst 3a is stabilized (corresponding to the above specified temperature T).

When the controller 31B determines that the temperature of the reformer 3 is not higher than the specified temperature T2, it executes step S123 again. When the controller 31B determines that the temperature of the reformer 3 is equal to or higher than the specified temperature T2, the controller 31B executes steps S105 to S108 similarly to the first embodiment described above.

Here, steps S101 to S103, S121, and S122 correspond to the first control process described above. Steps S123, S124, S105, and S106 correspond to the second control process described above.

In the above, when the start-up of the reformer 3 is instructed, the throttle valve 6, the first fuel supply valve 10, and the second fuel supply valve 12 are opened, as shown in FIGS. 11(a) to 11(c). do. Then, air is supplied to the combustor 2 and the reformer 3, and ammonia gas is supplied to the combustor 2 and the reformer 3.

When a mixed gas of ammonia gas and air is supplied to the combustor 2, the ammonia gas is ignited and combusted, generating high-temperature combustion gas. Then, when the high-temperature combustion gas is supplied to the reformer 3, the reformer 3 is heated, so the temperature of the reformer 3 starts to rise as shown in FIG. 11(d).

Then, when the temperature of the reformer 3 reaches a prescribed temperature T1 that is a combustible temperature, the ammonia gas is combusted by the reforming catalyst 3a of the reformer 3, and combustion gas is generated in the reformer 3. Therefore, the temperature of the reformer 3 further increases due to the heat of the combustion gas.

Furthermore, when the temperature of the reformer 3 reaches the combustible temperature, the opening degree of the throttle valve 6 increases as shown in FIG. Air flow increases. Thereby, the combustion operation by the combustor 2 and the reforming operation by the reformer 3 are simultaneously and efficiently performed.

Thereafter, when the temperature of the reformer 3 reaches a reforming temperature, the ammonia gas is reformed by the reforming catalyst 3a of the reformer 3, and a reformed gas containing hydrogen is generated. The reformed gas is then supplied to the hydrogen utilization device 13.

Thereafter, when the temperature of the reformer 3 reaches the specified temperature T2, the first fuel supply valve 10 closes, thereby stopping the supply of ammonia gas to the combustor 2, as shown in FIG. 11(b). Stop. Further, as shown in FIG. 11(a), as the opening degree of the throttle valve 6 becomes smaller, the flow rate of air supplied to the reformer 3 through the combustor 2 decreases.

Thereafter, when a specified time t has elapsed after the first fuel supply valve 10 was closed, the opening degrees of the throttle valve 6 and the second fuel supply valve 12 are changed as shown in FIGS. 11(a) and 11(c). By increasing the size, the flow rates of ammonia gas and air supplied to the reformer 3 increase. At this time, ammonia gas and air are supplied to the reformer 3 at a flow rate suitable for the reforming operation. This brings the reformer 3 into a steady state.

As described above, in this embodiment as well, ammonia gas can be supplied to the combustor 2 and the reformer 3 at an appropriate flow rate while shortening the startup time of the reformer 3. Further, since a dedicated air flow path for supplying air to the reformer 3 is not required, the air supply section 50 is simplified.

In this embodiment, when the temperature of the reformer 3 becomes equal to or higher than the specified temperature T1, the ammonia gas and By supplying air, the combustion operation and the reforming operation can be performed simultaneously, effectively and stably.

In this embodiment, when the temperature of the reformer 3 becomes equal to or higher than the specified temperature T1, the flow rate of air supplied to the combustor 2 and the reformer 3 is changed by changing the opening degree of the throttle valve 6. However, it is not limited to such a form. For example, the flow rate of ammonia gas supplied to the combustor 2 and the reformer 3 may be changed by changing the opening degree of the first fuel supply valve 10 or the second fuel supply valve 12, or by changing the opening degree of the first fuel supply valve 10 or the second fuel supply valve 12, 6. The flow rates of ammonia gas and air supplied to the combustor 2 and the reformer 3 may be changed by changing the opening degrees of the first fuel supply valve 10 and the second fuel supply valve 12.

Further, in the present embodiment, the specified temperature T1 is the combustible temperature of the reformer 3, but the specified temperature T1 is not particularly limited to the combustible temperature, but may be the reforming temperature of the reformer 3, etc. It's okay. Further, the specified temperature T2 may be a temperature higher than the specified temperature T1.

Further, in this embodiment, when the start-up of the reformer 3 is instructed, the throttle valve 6 and the first fuel supply valve 10 are controlled to open, and at the same time, the second fuel supply valve 12 is controlled to open. However, it is not limited to such a form. For example, as shown in FIG. 12, after the throttle valve 6 and the first fuel supply valve 10 are controlled to open, the second fuel supply valve 12 is opened before the temperature of the reformer 3 reaches the specified temperature T1. It may be controlled to open (see FIG. 12(c)).

Further, when the reformer 3 is in the maximum load operation state during steady state, the opening degrees of the throttle valve 6 and the second fuel supply valve 12 are controlled to be large, as shown in FIG. After that, the ammonia supplied to the reformer 3 is controlled to further increase the opening degree of the throttle valve 6 and the second fuel supply valve 12 at the timing when the reformer 3 reaches the maximum load operation state. Gas and air flow rates may be further increased.

Although several embodiments of the present invention have been described above, the present invention is not limited to the above embodiments. For example, in the first and third embodiments described above, the first fuel supply valve 10 and the second fuel supply valve 12 are injectors that inject ammonia gas, but the first fuel supply valve 10 and the second fuel supply valve 12 is not particularly limited to this form, and a flow rate control valve or the like disposed in the ammonia flow path may be used similarly to the fuel supply valve 40 in the second embodiment described above.

Furthermore, in the third embodiment described above, when the temperature of the reformer 3 becomes equal to or higher than the specified temperature T1, the opening degree of the throttle valve 6 is changed to reduce the amount of air supplied to the combustor 2 and the reformer 3. Although the flow rate is changed, such control processing may be applied to the first and second embodiments described above.

Further, in the embodiment described above, in the combustor 2, the gas introduction section 17 introduces ammonia gas and air in the tangential direction of the inner circumferential surface 16a of the casing 16 so that a tubular flow is generated inside the casing 16. However, it is not limited to this particular form. The gas introduction section 17 may introduce, for example, ammonia gas and air into the housing 16 in the radial direction of the housing 16. That is, the combustor 2 may be a burner other than a tubular flame burner, or may be a heater, etc., as long as it generates combustion gas to be supplied to the reformer 3.

Further, in the embodiment described above, various valves and the like are controlled based on the temperature of the reformer 3 detected by the temperature sensor 30, but the temperature sensor 30 may not be particularly necessary. For example, the flow rate of ammonia gas , the temperature of the reformer 3 may be estimated from the air flow rate, time, room temperature, etc.

Further, in the above embodiment, the reformer 3 has a reforming catalyst 3a that has both the function of burning ammonia and the function of decomposing ammonia into hydrogen, but it is not particularly limited to such a form. do not have. The reformer 3 may separately include a combustion catalyst that burns ammonia and a reforming catalyst that decomposes ammonia into hydrogen.

Further, in the above embodiment, air is supplied to the combustor 2 and the reformer 3 by the throttle valve 6, but the form is not limited to this. For example, a mass flow controller, a compressor, a pump, etc. Air may be supplied to the vessel 2 and the reformer 3.

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

Further, in the above embodiment, air is used as the oxidizing gas, but the present invention is also applicable to a reforming system using oxygen as the oxidizing gas.

1, 1A, 1B...Reforming system, 2...Combustor, 3...Reformer, 4...Air flow path (first oxidizing gas flow path), 5...Air flow path (second oxidizing gas flow path) , 6... Throttle valve (flow rate control valve), 10... First fuel supply valve, 12... Second fuel supply valve, 20... Combustion gas flow path, 21... Air supply section (oxidizing gas supply section), 23... Third... 1 fuel gas supply section, 24... second fuel gas supply section, 30... temperature sensor (temperature detection section), 31, 31A, 31B... controller (control section), 40... fuel supply valve, 41... ON/OFF valve ( on-off valve), 42... Ammonia flow path (first fuel gas flow path), 43... Ammonia flow path (second fuel gas flow path), 45... First fuel gas supply section, 46... Second fuel gas supply section, 50... Air supply section (oxidizing gas supply section), T... Specified temperature, T1... Specified temperature (first temperature), T2... Specified temperature (second temperature).

Claims (8)

a combustor that burns fuel gas to generate combustion gas;
a reformer that generates a reformed gas containing hydrogen by reforming the fuel gas;
a combustion gas flow path connecting the combustor and the reformer, through which the combustion gas flows from the combustor to the reformer;
an oxidizing gas supply section that supplies oxidizing gas to the combustor and the reformer;
a first fuel gas supply section that supplies the fuel gas to the combustor;
a second fuel gas supply section that supplies the fuel gas to the reformer;
a control unit that controls the oxidizing gas supply unit, the first fuel gas supply unit, and the second fuel gas supply unit,
The second fuel gas supply section is connected to the combustion gas flow path,
The control unit controls the oxidizing gas supply unit to supply the oxidizing gas to the combustor and the reformer when the reformer is started, and also controls the oxidizing gas supply unit to supply the oxidizing gas to the combustor and the reformer. A first control process is executed to control the first fuel gas supply section and the second fuel gas supply section so as to supply the fuel gas to the combustor. A reforming system that executes a second control process that controls the first fuel gas supply unit to stop supplying the fuel gas. The oxidizing gas supply unit is disposed in a first oxidizing gas passage through which the oxidizing gas flows toward the combustor, and in the first oxidizing gas passage, and is arranged in the combustor and the reformer. A flow rate control valve that controls the flow rate of the oxidizing gas supplied to the first oxidizing gas flow path and the combustion gas flow path is connected, and the oxidizing gas flows toward the reformer. a second oxidizing gas flow path;
The first fuel gas supply section is connected to the first oxidizing gas flow path,
The second fuel gas supply section is connected to the combustion gas flow path directly or via the second oxidizing gas flow path,
The reforming system according to claim 1, wherein the control unit controls the flow rate control valve to open when executing the first control process. The reforming system according to claim 2, wherein a pressure loss in the first oxidizing gas flow path is smaller than a pressure loss in the second oxidizing gas flow path. The first fuel gas supply section includes a first fuel supply valve that controls the flow rate of the fuel gas supplied to the combustor,
The second fuel gas supply section includes a second fuel supply valve that controls the flow rate of the fuel gas supplied to the reformer,
The control unit controls to open the first fuel supply valve and the second fuel supply valve when executing the first control process, and controls the first fuel supply valve to open the first fuel supply valve when executing the second control process. The reforming system according to claim 2 or 3, wherein the reforming system is controlled to close the fuel supply valve. The second fuel gas supply section is connected to the combustion gas flow path directly or via the second oxidizing gas flow path, and a first fuel gas flow path through which the fuel gas flows toward the reformer. , a fuel supply valve disposed in the first fuel gas flow path and controlling the flow rate of the fuel gas supplied to the combustor and the reformer,
The first fuel gas supply unit connects the fuel supply valve, the first fuel gas passage, and the first oxidizing gas passage, and the second fuel gas supply unit connects the fuel supply valve, the first fuel gas passage, and the first oxidizing gas passage, and the second fuel gas supply unit connects the fuel supply valve, the first fuel gas passage, and the first oxidizing gas passage. It has a gas flow path and an on-off valve that opens and closes the second fuel gas flow path,
The control unit controls to open the fuel supply valve and the on-off valve when executing the first control process, and controls to close the on-off valve when executing the second control process. The reforming system according to claim 2 or 3. The reforming system according to claim 5, wherein a pressure loss in the first fuel gas flow path is smaller than a pressure loss in the second fuel gas flow path. further comprising a temperature detection unit that detects the temperature of the reformer,
The reformer according to any one of claims 1 to 6, wherein the control unit executes the second control process when the temperature of the reformer detected by the temperature detection unit is equal to or higher than a specified temperature. system. When executing the first control process, the control unit controls the oxidizing gas supply unit to supply the oxidizing gas to the combustor and the reformer, and controls the oxidizing gas supply unit to supply the oxidizing gas to the combustor and the reformer. After controlling the first fuel gas supply section and the second fuel gas supply section to supply the fuel gas to the reformer, the temperature of the reformer detected by the temperature detection section is a first temperature. In this case, the oxidizing gas supply section, the first fuel gas supply section, and the When controlling at least one of the second fuel gas supply sections and executing the second control process, the temperature of the reformer detected by the temperature detection section is higher than the first temperature. 8. The reforming system according to claim 7, wherein the first fuel gas supply unit is controlled to stop supplying the fuel gas to the combustor when the temperature reaches 2 or higher.

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