JP2020180021A - Reforming system - Google Patents

Abstract

To provide a reforming system capable of quickly supplying gas in a necessary timing.SOLUTION: A reforming system 1 comprises: a buffer tank 5 capable of supplying pressure-accumulated gas by a differential pressure while pressure-accumulating reformed gas generated by a reforming part 4; and a supply-line L21 for supplying from the buffer tank 5 to a gas utilization part 11 for using gas. In this case, the buffer tank 5 is able to quickly supply the pressure-accumulated gas by releasing pressure on the supply-line L21 side. A switching part 30 can switch a flow of the reformed gas from the reforming part 4 between a pressure-accumulating line L22 and a bypass line L23. After reforming at the reforming part 4 is stabilized, the gas pressure-accumulated in the buffer tank 5 is not needed to be used. Accordingly, the buffer tank 5 is able to quickly supply the gas to the gas utilization part 11 in a subsequently necessary timing.SELECTED DRAWING: Figure 1

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 includes a reforming unit that generates a reforming gas containing hydrogen gas by reforming the raw material gas. The reformed gas is supplied to the engine, fuel cell, and the like. As a result, hydrogen in the reformed gas is used in engines, fuel cells, and the like.

Japanese Unexamined Patent Publication No. 2003-293867

In a reforming system such as the above-mentioned conventional technique, it takes time from the start of operation until the reforming can be stably supplied with a certain amount of reforming gas. Therefore, the gas utilization unit to which the reformed gas generated in the reforming unit is supplied may not be able to start up until a stable reformed gas is supplied. Therefore, the gas utilization unit that uses the reformed gas is required to supply the required amount of gas at the required timing.

An object of the present invention is to provide a reforming system capable of promptly supplying gas at a required timing.

The reforming system according to one aspect of the present invention has a reforming catalyst that decomposes a hydrogen-containing raw material into hydrogen, and has a reforming unit that reforms the hydrogen-containing raw material to generate a reformed gas containing hydrogen gas. , A raw material supply unit that supplies hydrogen-containing raw materials to the reforming unit, a pressure accumulating unit that can accumulate the reformed gas generated in the reforming unit, and can supply the accumulated gas by differential pressure, and gas from the pressure accumulating unit. A supply line that supplies the gas to be used, a pressure accumulator line that accumulates the reformed gas from the reformer to the accumulator, and a bypass line that bypasses the accumulator from the reformer to flow the reformed gas. It is provided with a switching unit for switching the flow of reformed gas from the unit between the accumulator line and the bypass line.

In such a reforming system, the reforming gas generated in the reforming section is accumulated, and the accumulated gas is supplied to the pressure accumulating section that can be supplied by the differential pressure and the gas utilization section that uses the gas from the pressure accumulating section. It is equipped with a supply line. In this case, the accumulator unit can quickly supply the accumulating gas by releasing the pressure on the supply line side. That is, even if the reforming in the reforming section is not stable, the pressure accumulating section can quickly supply the gas to the gas utilizing section at the timing required by the gas utilizing section. Here, the reforming system includes a bypass line for accumulating the reformed gas from the reforming section to the accumulating section, and a bypass line for passing the reforming gas by bypassing the accumulating section from the reforming section. Then, the switching unit can switch the flow of the reformed gas from the reforming unit between the accumulator line and the bypass line. In this case, when the reforming in the reforming section is stable, the reforming section can bypass the accumulator section and supply the reforming gas to the gas utilization section. Therefore, since it is not necessary to use the gas accumulated in the accumulator, the accumulator can promptly supply the gas to the gas utilization unit at the next required timing. As described above, the reforming system can promptly supply gas to the gas utilization unit at a required timing.

At the time of starting the reforming system, the accumulator unit may supply gas to the gas utilization unit via the supply line. When the reforming system is started, reforming in the reforming part is not stable. At such a timing, the accumulator unit can quickly supply gas to the gas utilization unit.

The switching unit may flow the reformed gas to the accumulator line until the amount of gas accumulated in the accumulator reaches a predetermined amount, and then the reformed gas to the bypass line when the amount of gas accumulated in the accumulator reaches a predetermined amount. .. As a result, the next time the gas is supplied from the accumulator to the gas utilization unit, the accumulator can supply the gas at a sufficient pressure.

On the upstream side of the accumulator line, a separation unit that separates hydrogen from the reformed gas and supplies it to the accumulator may be provided. In this case, since the purity of hydrogen in the accumulator can be increased, the accumulator can be miniaturized.

A pump for pumping the reformed gas to the accumulator may be provided on the upstream side of the accumulator line. In this case, since the pressure of the pressure accumulator can be increased, the pressure accumulator can be miniaturized.

The reforming system may further include a return line that returns the gas in the accumulator to the reforming section. In this case, when the reforming system is started, the starting time can be shortened by using the gas of the accumulator for the reforming part.

According to the present invention, gas can be supplied promptly at a required timing.

It is a schematic block diagram which shows the modification system which concerns on embodiment of this invention. It is a graph which shows the state of various components. It is a flowchart which shows the operation of a reforming system. It is a schematic block diagram which shows the reforming system which concerns on the modification. It is a schematic block diagram which shows the reforming system which concerns on the modification.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or equivalent elements are designated by the same reference numerals, and duplicate description will be omitted.

FIG. 1 is a schematic configuration diagram showing a reforming system according to an embodiment of the present invention. As shown in FIG. 1, the reforming system 1 includes a raw material supply unit 2, an air supply unit 3, a reforming unit 4, a buffer tank 5 (accumulation unit), and a controller 6.

The raw material supply unit 2 supplies the hydrogen-containing raw material to the reforming unit 4. The hydrogen-containing raw material is a raw material containing hydrogen as a constituent element of the composition. In this embodiment, ammonia (NH ₃ ) is used as the hydrogen-containing raw material. The raw material supply unit 2 includes a tank 2a that stores ammonia in a liquid state, and a vaporizer 2b that vaporizes the ammonia in the liquid state into ammonia gas. Ammonia in the tank 2a is supplied to the vaporizer 2b via the line L1. The vaporizer 2b supplies ammonia gas to the gas utilization unit 11 via the lines L2 and L3. The line L2 and the line L3 are connected to each other at a connection point P2 with the line L9 described later. The vaporizer 2b supplies ammonia gas to the reforming unit 4 via the line L4.

The gas utilization unit 11 is a portion that utilizes the gas supplied from the reforming system 1. Examples of the gas utilization unit 11 include an internal combustion engine such as an ammonia engine or an ammonia gas turbine using ammonia as fuel. These internal combustion engines utilize hydrogen at startup.

The air supply unit 3 supplies air to the reforming unit 4. As the air supply unit 3, for example, a blower or the like that sends air in the atmosphere to the reforming unit 4 is used. The air supply unit 3 supplies air to the reforming unit 4 via the line L5.

The reforming unit 4 reforms ammonia gas to generate a reformed gas containing hydrogen gas. The reforming unit 4 has a reforming catalyst that decomposes ammonia gas into hydrogen. The reforming catalyst may have a function of burning ammonia gas in addition to a function of decomposing ammonia gas into hydrogen. As the reforming catalyst, for example, palladium, rhodium, platinum or the like is used. The reforming gas generated in the reforming unit 4 is supplied to the buffer tank 5 via the lines L6 and L7. The line L6 and the line L7 are connected to each other at a connection point P1 with the line L9 described later.

The reforming unit 4 is provided with a temperature sensor 20 that detects the temperature of the reforming catalyst. The temperature sensor 20 may detect either the temperature of the inlet of the reforming catalyst into which the ammonia gas flows in or the temperature of the outlet of the reforming catalyst in which the reforming gas flows out.

The buffer tank 5 is a tank capable of accumulating the reformed gas generated by the reforming unit 4 and supplying the accumulated gas by a differential pressure. The buffer tank 5 supplies gas to the gas utilization unit 11 via the line L8. The buffer tank 5 can store the gas in a high pressure state. Therefore, the buffer tank 5 can supply gas to the gas utilization unit 11 by the differential pressure from the gas utilization unit 11 whose pressure is lower than that of the buffer tank 5. The buffer tank 5 stores hydrogen gas, nitrogen gas, ammonia gas, and water vapor as gases contained in the reforming gas in a high pressure state. The pressure of the buffer tank 5 is not particularly limited, but it is preferable that the gas is stored at a pressure of at least 0.2 MPa or more at the time when the supply of the gas to the gas utilization unit 11 is started. The buffer tank 5 is provided with a pressure sensor 21 for detecting the internal pressure and a hydrogen concentration sensor 22 for detecting the concentration of accumulated hydrogen.

As described above, the reforming system 1 includes lines L1 to L8. Further, the reforming system 1 includes lines L6 and L7 connecting the reforming unit 4 and the buffer tank 5, and lines L2 and L3 between the vaporizer 2b and the gas utilization unit 11. Among such lines, the line L8 functions as a supply line L21 for supplying gas from the buffer tank 5 to the gas utilization unit 11. The lines L6 and L7 function as a pressure accumulating line L22 for accumulating the reformed gas from the reforming unit 4 to the buffer tank 5. The lines L6, L9, and L3 function as bypass lines L23 in which the reforming gas is flowed by bypassing the buffer tank 5 from the reforming unit 4.

The reforming system 1 includes a valve 12 on line L9 of bypass line L23. The valve 12 switches the opening and closing of the line L9. The reforming system 1 includes a valve 13 on line L7 of accumulator line L22. The valve 13 switches the opening and closing of the line L7. The switching unit 30 is configured by the combination of the valves 12 and 13. The switching unit 30 switches the flow of the reformed gas from the reforming unit 4 between the accumulator line L22 and the bypass line L23. Specifically, the switching unit 30 switches the reformed gas flow to the accumulator line L22 by closing the valve 12 on the bypass line L23 side and opening the valve 13 on the accumulator line L22 side. The switching unit 30 switches the reformed gas flow to the bypass line L23 by opening the valve 12 on the bypass line L23 side and closing the valve 13 on the accumulator line L22 side. However, the switching unit 30 not only allows the entire reformed gas to flow through either the bypass line L23 or the accumulator line L22, but also adjusts the opening degrees of the valves 12 and 13 to allow the bypass line L23 and the accumulator line L22 to flow. The reforming gas may flow through both.

The reforming system 1 includes a valve 14 on line L8 of supply line L21. The valve 14 switches the opening and closing of the line L8. As a result, the valve 14 can switch between supplying and stopping the gas of the buffer tank 5 to the gas utilization unit 11. The valve 14 can adjust the flow rate of gas from the buffer tank 5 to the gas utilization unit 11 by adjusting the opening degree.

The reforming system 1 includes a valve 16 on the line L4 between the vaporizer 2b and the reforming unit 4. The valve 16 switches the opening and closing of the line L4. As a result, the valve 16 can switch between supplying and stopping the ammonia gas of the vaporizer 2b to the reforming unit 4. The valve 16 can adjust the flow rate of gas from the vaporizer 2b to the reforming unit 4 by adjusting the opening degree. The reforming system 1 includes a valve 17 on the line L2 between the vaporizer 2b and the gas utilization unit 11. The valve 17 switches the opening and closing of the line L2. As a result, the valve 17 can switch between supplying and stopping the ammonia gas of the vaporizer 2b to the gas utilization unit 11. The valve 17 can adjust the flow rate of gas from the vaporizer 2b to the gas utilization unit 11 by adjusting the opening degree.

The controller 6 is a control unit that controls the entire reforming system 1. The controller 6 is composed of a CPU, RAM, ROM, an input / output interface, and the like. The controller 6 is electrically connected to the raw material supply unit 2, the air supply unit 3, and the valves 12, 13, 14, 16, and 17, and transmits control signals to these. Further, the controller 6 is electrically connected to the temperature sensor 20, the pressure sensor 21, and the hydrogen concentration sensor 22. The controller 6 acquires the temperature of the reforming catalyst of the reforming unit 4 detected by the temperature sensor 20. The controller 6 can determine from the detection result of the temperature sensor 20 that the reforming unit 4 has reached the target temperature. Here, the target temperature is a temperature at which the reforming unit 4 can perform steady operation, and may be set to, for example, 600 ° C. During steady operation, the reforming unit 4 can generate a set constant amount of hydrogen. However, the specific target temperature is not limited to the temperature. The controller 6 can determine whether or not the pressure accumulation on the buffer tank 5 is completed based on the detection results of the pressure sensor 21 and the hydrogen concentration sensor 22. The controller 6 controls the raw material supply unit 2, the air supply unit 3, and the valves 12, 13, 14, 16, 17 based on the detection results of the temperature sensor 20, the pressure sensor 21, and the hydrogen concentration sensor 22.

When the reforming system 1 is started, the controller 6 turns on the raw material supply unit 2 and the air supply unit 3, opens the valves 13, 14, 16 and 17, and closes the valve 12. However, the controller 6 prevents the gas from flowing back from the buffer tank 5 by opening the valve 12 and closing the valve 13 only immediately after the start. When the reforming catalyst of the reforming unit 4 reaches the target temperature, the controller 6 suppresses the flow rate of the gas supplied from the buffer tank 5 to the gas utilization unit 11 and stores the reforming gas in the buffer tank 5. Specifically, the controller 6 reduces the opening degree of the valve 14 to reduce the flow rate of gas with respect to the gas utilization unit 11.

When the amount of gas in the buffer tank 5 reaches a predetermined amount, the controller 6 causes the reformed gas from the reforming unit 4 to flow to the bypass line L23. Specifically, the controller 6 closes the valves 13 and 14 and opens the valve 12. The controller 6 may determine whether or not the amount of gas in the buffer tank 5 has reached a predetermined amount, but the controller 6 makes a determination based on the detection results of the pressure sensor 21 and the hydrogen concentration sensor 22. Good. That is, when the pressure detected by the pressure sensor 21 reaches a predetermined threshold value, the controller 6 may determine that the gas in the buffer tank 5 has reached a predetermined amount. Further, the controller 6 may determine that the amount of gas in the buffer tank 5 has reached a predetermined amount when both the condition based on the pressure sensor 21 and the condition based on the hydrogen concentration sensor 22 are satisfied.

As a result, when the reforming system 1 is started, the buffer tank 5 supplies gas to the gas utilization unit 11 via the supply line L21. The switching unit 30 allows the reformed gas to flow through the accumulator line L22 until the amount of gas accumulated in the buffer tank 5 reaches a predetermined amount, and bypasses the reformed gas when the amount of gas accumulated in the buffer tank 5 reaches a predetermined amount. Flow to L23.

Next, the operation of the reforming system 1 will be described with reference to FIGS. 2 and 3. FIG. 2 is a graph showing the states of various components. The “reformer temperature” in FIG. 2 is a graph showing the temperature of the reformer of the reformer 4. The “reformer outlet gas” in FIG. 2 is a graph showing the concentrations of H ₂ and NH ₃ contained in the reformed gas. The “buffer tank pressure” in FIG. 2 is a graph showing the pressure of the buffer tank 5. “Valve 12, 13, 14, 16, 17” in FIG. 2 is a graph showing a switching state of valves 12, 13, 14, 16, 17. The upper side of the graph shows that the valves 12, 13, 14, 16 and 17 are open, and the lower side shows that the valves 12, 13, 14, 16 and 17 are closed. FIG. 3 is a flowchart showing the operation of the reforming system 1. The process of FIG. 3 is a process executed by the controller 6 when the reforming system 1 is started.

As shown in FIG. 3, when the reforming system 1 is started, the controller 6 executes the start processing (step S10). In S10, the controller 6 turns on the raw material supply unit 2 and the air supply unit 3, opens the valves 13, 14, 16 and 17, and closes the valve 12. As a result, the buffer tank 5 promptly supplies gas to the gas utilization unit 11 via the supply line L21. However, the controller 6 keeps the valve 12 open and the valve 13 closed for a certain period of time immediately after the start, thereby preventing the gas from flowing back from the buffer tank 5. Further, the vaporizer 2b supplies ammonia gas to the gas utilization unit 11 via the lines L2 and L3. Further, the vaporizer 2b supplies ammonia gas to the reforming unit 4 via the line L4. The air supply unit 3 supplies air to the reforming unit 4 via the line L5. The reforming unit 4 supplies the reforming gas to the buffer tank 5 via the accumulator line L22.

When the treatment of S10 is performed, ammonia is oxidized by the reforming catalyst in the reforming unit 4, and combustion heat is generated. As shown in the formula below, a chemical reaction between a part of ammonia and oxygen causes a combustion reaction in which ammonia ignites and burns, and combustion heat is generated (exothermic reaction).
NH ₃ + 3/4O ₂ → 1 / 2N ₂ + 3 / 2H ₂ O + Q

Then, ammonia is reformed by the reforming catalyst to generate a reformed gas. Specifically, as shown in the following formula, a reforming reaction occurs in which ammonia is decomposed into hydrogen and nitrogen by the heat of combustion, and a reformed gas in a hydrogen-rich state is generated (endothermic reaction).
NH ₃ → 3 / 2H ₂ + 1 / 2N ₂ −Q

When the reforming reaction of ammonia gas is started, the temperature of the reforming catalyst rises. Therefore, as shown in FIG. 2, as the reforming in the reforming section 4 gradually progresses, the hydrogen concentration of the reforming gas in the reforming section 4 and the temperature of the reforming section 4 gradually increase, and the reforming occurs. The concentration of unreacted ammonia in the gas gradually decreases. Since the buffer tank 5 supplies gas to the gas utilization unit 11, the pressure in the buffer tank 5 gradually decreases.

Next, the controller 6 determines whether or not the temperature of the reforming catalyst of the reforming unit 4 has reached the target temperature (step S20). When it is determined in S20 that the temperature of the reforming catalyst of the reforming unit 4 has not reached the target temperature, the controller 6 performs the processing of S20 again while maintaining the state set in S10.

When it is determined in S20 that the temperature of the reforming catalyst of the reforming unit 4 has reached the target temperature (state at the time indicated by "t1" in FIG. 2), the controller 6 executes the accumulator process (step S30). ). In S30, the controller 6 reduces the opening degree of the valve 14 to reduce the flow rate of gas with respect to the gas utilization unit 11. As a result, the flow rate of the gas supplied from the buffer tank 5 to the gas utilization unit 11 is suppressed, and the reformed gas is accumulated in the buffer tank 5. Therefore, as shown in FIG. 2, the pressure and hydrogen concentration of the buffer tank 5 gradually increase.

Next, the controller 6 determines whether or not the pressure accumulation in the buffer tank 5 is completed (step S40). The controller 6 determines whether or not the accumulator has been completed by determining whether or not the amount of gas in the buffer tank 5 has reached a predetermined amount. When it is determined in S40 that the amount of gas in the buffer tank 5 is not a predetermined amount, the controller 6 performs the process of S40 again while maintaining the state set in S30.

When it is determined in S40 that the amount of gas in the buffer tank 5 is a predetermined amount, the controller 6 closes the valves 13 and 14 and opens the valve 12. As a result, the switching unit 30 causes the reformed gas from the reforming unit 4 to flow to the bypass line L23. The reformed gas is supplied to the gas utilization unit 11 via the bypass line L23. After that, the same state is maintained until the reforming system 1 is stopped, and the process shown in FIG. 3 is completed.

Next, the operation and effect of the reforming system 1 according to the present embodiment will be described.

The reforming system 1 accumulates the reformed gas generated by the reforming unit 4, and supplies the accumulated gas by a differential pressure to the buffer tank 5 and the gas utilization unit 11 that uses the gas from the buffer tank 5. A supply line L21 for supplying is provided. In this case, the buffer tank 5 can quickly supply the accumulated gas by releasing the pressure on the supply line L21 side. That is, even if the reforming in the reforming unit 4 is not stable, the buffer tank 5 can promptly supply the gas to the gas utilization unit 11 at the timing required by the gas utilization unit 11. it can. As described above, when the gas is promptly supplied to the gas utilization unit 11, the engine and the turbine of the gas utilization unit 11 can be started promptly by using the hydrogen contained in the gas. This reduces the start-up time of the engine and turbine. Here, in the reforming system 1, in addition to the pressure accumulating line L22 that accumulates the reformed gas from the reforming unit 4 into the buffer tank 5, a bypass line that bypasses the buffer tank 5 from the reforming unit 4 to flow the reformed gas. It is equipped with L23. Then, the switching unit 30 can switch the flow of the reformed gas from the reforming unit 4 between the accumulator line L22 and the bypass line L23.

In this case, when the reforming in the reforming unit 4 is stable, the reforming unit 4 can bypass the buffer tank 5 and supply the reformed gas to the gas utilization unit 11. For example, when the bypass line L23 is not provided, the reforming system 1 supplies gas from the buffer tank 5 to the gas utilization unit 11 even after the supply of the reforming gas of the reforming unit 4 is stable. Become. In this case, there is a possibility that the gas cannot be quickly supplied from the buffer tank 5 when the engine or turbine of the next gas utilization unit 11 is started, such as when the operation is completed with the pressure of the gas in the buffer tank 5 lowered. There is. On the other hand, when the bypass line L23 is provided, it is not necessary to use the gas accumulated in the buffer tank 5 after the reforming in the reforming section 4 is stable. Therefore, the buffer tank 5 can promptly supply gas to the gas utilization unit 11 at the next required timing. Further, when the reforming gas is supplied from the bypass line L23 to the gas utilization unit 11 after accumulating the pressure in the buffer tank 5, the operating pressure of the reforming unit 4 may be lowered, whereby the reforming rate can be increased. Is. As described above, the reforming system 1 can promptly supply gas to the gas utilization unit 11 at a required timing.

When the reforming system 1 is started, the buffer tank 5 supplies gas to the gas utilization unit 11 via the supply line L21. When the reforming system 1 is started, the reforming in the reforming unit 4 is not stable. At such a timing, the buffer tank 5 can quickly supply gas to the gas utilization unit 11.

The switching unit 30 allows the reformed gas to flow through the accumulator line L22 until the amount of gas accumulated in the buffer tank 5 reaches a predetermined amount, and bypasses the reformed gas when the amount of gas accumulated in the buffer tank 5 reaches a predetermined amount. Flow to L23. As a result, the buffer tank 5 can supply the gas at a sufficient pressure the next time the gas is supplied from the buffer tank 5 to the gas utilization unit 11.

The present invention is not limited to the above-described embodiment.

For example, the configuration shown in FIG. 4A may be adopted. In FIG. 4A, the accumulator line L22 is provided with a separation membrane 31 (separation portion) that separates hydrogen from the reformed gas and supplies it to the buffer tank 5. The separation membrane 31 separates hydrogen gas from the gas of other components among the reforming gases, and supplies the separated hydrogen gas to the buffer tank 5. In this case, since the purity of hydrogen in the buffer tank 5 can be increased, the size of the buffer tank 5 can be reduced.

Further, the configuration shown in FIG. 4B may be adopted. In FIG. 4B, the accumulator line L22 is provided with a pump 40 that pumps the reformed gas to the buffer tank 5. In this case, since the pressure of the buffer tank 5 can be increased, the size of the buffer tank 5 can be reduced.

Further, the configuration shown in FIG. 5 may be adopted. The reforming system 1 shown in FIG. 5 further includes a return line L10 for returning the gas in the buffer tank 5 to the reforming unit 4. Further, a valve 25 is provided on the return line L10. The controller 6 promptly supplies the gas in the buffer tank 5 to the reforming unit 4 by opening the valve 25 when the reforming system 1 is started. In the reforming section 4, the gas in the buffer tank 5 can be used to quickly ignite with, for example, a glow plug, and the reforming catalyst can be heated by the heat of combustion of hydrogen. In this case, when the reforming system 1 is started, the reforming unit 4 uses the gas in the buffer tank 5, so that the starting time can be shortened.

In addition to the engine and turbine, a fuel cell or the like that chemically reacts hydrogen with oxygen in the air to generate electricity may be adopted as the gas utilization unit 11.

In the above-described embodiment, the switching unit 30 is composed of valves 12 and 13, but the switching method is not particularly limited, and for example, a three-way valve or the like may be used to switch between the accumulator line and the bypass line. ..

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

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

1 ... reforming system, 2 ... raw material supply section, 4 ... reforming section, 5 ... buffer tank (accumulation section), 31 ... switching section, 30 ... separation membrane (separation section), 40 ... pump, L21 ... supply line, L22 ... Accumulation line, L23 ... Bypass line, L10 ... Return line.

Claims (6)

A reforming unit having a reforming catalyst that decomposes a hydrogen-containing raw material into hydrogen and reforming the hydrogen-containing raw material to generate a reformed gas containing hydrogen gas.
A raw material supply unit that supplies the hydrogen-containing raw material to the reforming unit,
A pressure accumulating unit capable of accumulating the reformed gas generated in the reforming unit and supplying the accumulated gas by a differential pressure.
A supply line that supplies the gas from the accumulator to the gas utilization unit that uses the gas.
An accumulator line for accumulating the reformed gas from the reformed portion to the accumulator portion,
A bypass line that bypasses the pressure accumulator from the reformed portion and allows the reformed gas to flow.
A reforming system including a switching section for switching the flow of the reforming gas from the reforming section between the accumulator line and the bypass line. The reforming system according to claim 1, wherein when the reforming system is started, the pressure accumulating section supplies the gas to the gas utilization section via the supply line. The switching unit causes the reformed gas to flow through the accumulator line until the amount of the gas accumulated in the accumulator reaches a predetermined amount, and when the amount of the gas accumulated in the accumulator reaches the predetermined amount, the modification is performed. The reforming system according to claim 1 or 2, wherein the quality gas is allowed to flow through the bypass line. The reforming system according to any one of claims 1 to 3, wherein the pressure accumulating line is provided with a separating unit that separates hydrogen from the reforming gas and supplies it to the accumulating unit. The reforming system according to any one of claims 1 to 4, wherein the pressure accumulating line is provided with a pump for pumping the reformed gas to the pressure accumulating portion. The reforming system according to any one of claims 1 to 5, further comprising a return line for returning the gas in the accumulator to the reforming section.

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