JP6117838B2 - High pressure hydrogen production system and method for operating high pressure hydrogen production system - Google Patents

Description

  The present invention relates to a high-pressure hydrogen production system that produces high-pressure hydrogen and supplies it to a supplier such as a fuel cell vehicle, and an operation method of the high-pressure hydrogen production system.

  In recent years, vehicles equipped with fuel cells (FCV: Fuel Cell Vehicle, hereinafter referred to as “fuel cell vehicles”) have been developed. Since the fuel cell vehicle uses a fuel cell that generates electric power by chemically reacting hydrogen and oxygen (air) as a power source, it is necessary to supply hydrogen to the fuel cell vehicle. That is, gasoline for a gasoline vehicle powered by a gasoline engine corresponds to hydrogen for a fuel cell vehicle. Therefore, the fuel cell vehicle receives hydrogen at the hydrogen station for the fuel cell vehicle, which corresponds to a gasoline station for the gasoline vehicle, and the hydrogen supplied from the hydrogen station is stored in a hydrogen tank provided in the fuel cell vehicle. It will be stored.

  The hydrogen station includes a hydrogen production apparatus (for example, Patent Document 1) and a pressure accumulator that stores hydrogen produced by the hydrogen production apparatus, and hydrogen stored in the pressure accumulator is supplied to the fuel cell vehicle. Will be.

JP 2011-132103 A

  At the above hydrogen station, the hydrogen consumption (the amount of hydrogen supplied to the fuel cell vehicle, that is, the number of fuel cell vehicles visited) fluctuates, so the hydrogen production system is stopped or started according to the hydrogen consumption. It is necessary to do. Since the hydrogen production apparatus has a possibility of malfunction if the frequency of stopping and starting is high, development of efficient operation control of the hydrogen production apparatus is desired.

  An object of the present invention is to provide a high-pressure hydrogen production system capable of efficiently operating a hydrogen production apparatus and a method for operating the high-pressure hydrogen production system.

  In order to solve the above problems, the high-pressure hydrogen production system of the present invention produces and outputs hydrogen, and at least performs an output increase process for increasing the hydrogen output and an output decrease process for decreasing the hydrogen output. A hydrogen production apparatus, a compressor that boosts the hydrogen output from the hydrogen production apparatus, a first pressure accumulator and a second pressure accumulator that store hydrogen boosted by the compressor, and the first When the pressure of the pressure accumulator becomes equal to or higher than the first threshold value, the hydrogen output from the hydrogen production apparatus and pressurized by the compressor is stored in the second pressure accumulator, and the first pressure accumulator When the pressure becomes less than the first threshold value, one or both of hydrogen output from the hydrogen production apparatus and hydrogen stored in the second pressure accumulator is increased by the compressor, and the first To the accumulator And when the pressure of the second pressure accumulator exceeds the second threshold value, the output reduction process is started, and the pressure of the second pressure accumulator is less than the third threshold value which is smaller than the second threshold value. A control unit that controls the hydrogen production apparatus to perform the output increase process, and the second pressure accumulator performs a start process for increasing the hydrogen output from a stopped state to a predetermined output. The difference between the maximum value of the amount of hydrogen delivered from the first pressure accumulator during the period to be performed and the amount of hydrogen output during the period during which the start process is performed, and the output of hydrogen until the stop state is reached The second threshold value is set based on the amount of hydrogen output during the period during which the stop process is performed. The third threshold is equal to the start process. The maximum value of the amount of hydrogen transmitted from the first accumulator to the period, characterized in that it is set on the basis of the amount of hydrogen that is output during a period in which the start processing is performed.

  Moreover, the said control part is good also as controlling the said hydrogen production apparatus, and starting the said stop process, if the pressure of a said 2nd pressure accumulator exceeds the said 2nd threshold value.

In order to solve the above-described problems, the high-pressure hydrogen production system of the present invention produces and outputs hydrogen, and at least performs an output increase process for increasing the hydrogen output and an output decrease process for decreasing the hydrogen output. Hydrogen production apparatus, compressor for boosting the hydrogen output from the hydrogen production apparatus, first and second pressure accumulators for storing hydrogen boosted by the compressor, and the first pressure accumulation When the pressure of the reactor becomes equal to or higher than the first threshold value, the hydrogen output from the hydrogen production apparatus and pressurized by the compressor is stored in the second accumulator, and the pressure of the first accumulator Is less than the first threshold, either one or both of the hydrogen output from the hydrogen production apparatus and the hydrogen stored in the second pressure accumulator is boosted by the compressor, and the first Store in pressure accumulator And a control unit for the second pressure accumulator, the amount of hydrogen transmitted from the first accumulator during the start process of increasing the output of the hydrogen from the stop state to a predetermined output is performed The difference between the maximum value and the amount of hydrogen output during the period during which the start process is performed, and the amount of hydrogen output during the period during which the stop process for reducing the output of hydrogen until the stop state is performed are at least When the pressure of the second pressure accumulator exceeds a second threshold set based on the amount of hydrogen output during the period during which the stop process is performed, the control unit The hydrogen output by the hydrogen production apparatus is adjusted according to the pressure of the second pressure accumulator.

Further, the prior SL controller, the second accumulator pressure is equal to or less than the second threshold value smaller than the third threshold value, and controls the hydrogen production device may be to perform the output increasing process .

  The third threshold value is a maximum value of the amount of hydrogen delivered from the first pressure accumulator during a period in which the start process for increasing the hydrogen output from the stop state to a predetermined output is performed, and the start process It may be set based on the amount of hydrogen output during the period to be performed.

  In order to solve the above problems, an operation method of the high-pressure hydrogen production system of the present invention is to produce and output hydrogen, increase output of hydrogen, increase output of hydrogen, and decrease of output of hydrogen. A hydrogen production apparatus that performs at least the above, a compressor that boosts the hydrogen output from the hydrogen production apparatus, and a first pressure accumulator and a second pressure accumulator that store the hydrogen boosted by the compressor, The second pressure accumulator includes a maximum value of the amount of hydrogen delivered from the first pressure accumulator during the period in which the start process for increasing the hydrogen output from the stop state to a predetermined output is performed, and the start process. The capacity to store at least the amount of hydrogen output during the period when the stop process is performed to reduce the output of hydrogen until the stop state is reached. High pressure hydrogen When the pressure of the first pressure accumulator is determined to be equal to or higher than a first threshold, and the pressure of the first pressure accumulator is determined to be equal to or higher than the first threshold. , The hydrogen output from the hydrogen production apparatus and boosted by the compressor is stored in the second pressure accumulator, and it is determined that the pressure of the first pressure accumulator is less than the first threshold value. Then, either one or both of hydrogen output from the hydrogen production device and hydrogen stored in the second pressure accumulator is boosted by the compressor and stored in the first pressure accumulator, It is determined whether or not the pressure of the second pressure accumulator exceeds a second threshold value set based on the amount of hydrogen output during the period in which the stop process is performed, and the pressure of the second pressure accumulator is When it is determined that the second threshold value is exceeded, the hydrogen production device is To control the output reduction process, the pressure of the second pressure accumulator is a maximum value of the amount of hydrogen delivered from the first pressure accumulator during the period when the start process is performed, It is determined whether or not it is less than a third threshold value that is set based on the amount of hydrogen that is output during the period in which the start process is performed, and is less than the second threshold value, and the pressure of the second pressure accumulator is If it is determined that the value is less than the third threshold value, the hydrogen production apparatus is controlled to perform the output increase process.

In order to solve the above-described problems, the operation method of the high-pressure hydrogen production system of the present invention is to produce and output hydrogen, and to increase the output of hydrogen, and to reduce the output of hydrogen. A hydrogen production apparatus that performs at least the above, a compressor that boosts the hydrogen output from the hydrogen production apparatus, and a first pressure accumulator and a second pressure accumulator that store the hydrogen boosted by the compressor, The second pressure accumulator includes a maximum value of the amount of hydrogen delivered from the first pressure accumulator during the period in which the start process for increasing the hydrogen output from the stop state to a predetermined output is performed, and the start process. The capacity to store at least the amount of hydrogen output during the period when the stop process is performed to reduce the output of hydrogen until the stop state is reached. High pressure hydrogen When the pressure of the first pressure accumulator is determined to be equal to or higher than a first threshold, and the pressure of the first pressure accumulator is determined to be equal to or higher than the first threshold. , The hydrogen output from the hydrogen production apparatus and boosted by the compressor is stored in the second pressure accumulator, and it is determined that the pressure of the first pressure accumulator is less than the first threshold value. Then, either one or both of hydrogen output from the hydrogen production device and hydrogen stored in the second pressure accumulator is boosted by the compressor and stored in the first pressure accumulator, It is determined whether or not the pressure of the second pressure accumulator exceeds a second threshold value set based on the amount of hydrogen output during the period in which the stop process is performed, and the pressure of the second pressure accumulator is When it is determined that the second threshold value is exceeded, the second pressure accumulator And adjusting the output of hydrogen by the hydrogen producing device in accordance with the pressure.

  According to the present invention, the hydrogen production apparatus can be operated efficiently.

It is a figure for demonstrating a hydrogen station. It is a figure for demonstrating a high pressure hydrogen production system. It is a figure for demonstrating the specific structure of a hydrogen production apparatus. It is a figure for demonstrating the output amount of hydrogen of the hydrogen production apparatus which is producing hydrogen also in a stop state at the time of normal operation, a stop process period, and a start process period. It is a figure for demonstrating the output amount of hydrogen of a hydrogen production apparatus which stops production of hydrogen in a stop state at the time of normal operation, a stop process period, and a start process period. It is a figure for demonstrating the setting of the pressure of the variable pressure accumulator used as the control reference | standard of a hydrogen production apparatus. It is a flowchart for demonstrating the flow of control of a hydrogen production apparatus. It is a flowchart for demonstrating the flow of control of a compressor. It is a flowchart for demonstrating the flow of control of a valve | bulb.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

(Hydrogen station 100)
FIG. 1 is a diagram for explaining the hydrogen station 100. As shown in FIG. 1, the hydrogen station 100 includes a high-pressure hydrogen production system 110, a precooler 120, and a dispenser 130. In FIG. 1, the flow of hydrogen is indicated by solid arrows.

  As shown in FIG. 1, the high-pressure hydrogen production system 110 produces hydrogen, and the produced hydrogen is pressurized to, for example, 82 MPa and stored. The hydrogen stored in the high-pressure hydrogen production system 110 is cooled by the precooler 120 (for example, −40 ° C.) and supplied to the hydrogen tank provided in the fuel cell vehicle via the filling control valve of the dispenser 130 (differential pressure). Filled). Here, since hydrogen is heated by adiabatic compression when hydrogen is supplied from the high-pressure hydrogen production system 110 to the hydrogen tank of the fuel cell vehicle, the precooler is used so that the temperature of the hydrogen does not reach the heat resistant temperature of the hydrogen tank. 120 is provided. Hereinafter, a specific configuration of the high-pressure hydrogen production system 110 will be described.

(High pressure hydrogen production system 110)
FIG. 2 is a diagram for explaining the high-pressure hydrogen production system 110. As shown in FIG. 2, the high pressure hydrogen production system 110 includes a hydrogen production apparatus 210, a suction tank 220, a compressor 230, a high pressure accumulator 240 (first accumulator), and a variable pressure accumulator 250 (first accumulator). 2 pressure accumulator), a pressure measurement unit 260, a control unit 270, valves V1, V2, and V3, and a pressure reducing valve RV. In FIG. 2, the hydrogen flow is indicated by a solid line, and the signal flow is indicated by a dashed arrow.

  The hydrogen production apparatus 210 produces and outputs high-purity hydrogen from fossil fuels such as city gas and liquefied petroleum gas (LPG). Moreover, the hydrogen production apparatus 210 can also be comprised with a water electrolysis apparatus.

  The hydrogen production apparatus 210 performs a normal operation process, an output reduction process, and an output increase process in response to a control command from the control unit 270 described later. Here, the normal operation process is a process (load keep) for producing hydrogen at a predetermined output (for example, maximum output (100% output)). The output reduction process is a process (load down) for reducing the output of hydrogen. Of the output reduction processing, in particular, a process of reducing the hydrogen output until the stop state is reached, that is, after the hydrogen output is reduced to a predetermined output (here, the minimum output) and reaches a predetermined output. Processing for stopping output is referred to as stop processing. The output increase process is a process (load up) for increasing the output of hydrogen. Of the output increase processing, in particular, processing for increasing the hydrogen output from the stop state to a predetermined output (for example, maximum output (100% output)) is referred to as start processing. The stop state refers to a state in which hydrogen is not output to the outside (hydrogen output is stopped).

  The suction tank 220 is provided between the hydrogen production apparatus 210 and the compressor 230 and functions as a cushion tank.

  The compressor 230 compresses the hydrogen (0.7 MPa) produced by the hydrogen production apparatus 210 and raises the pressure to 82 MPa, for example.

  The high pressure accumulator 240 stores hydrogen (82 MPa) boosted by the compressor 230. Then, the hydrogen stored in the high pressure accumulator 240 is cooled by the precooler 120 and supplied (filled) to a hydrogen tank provided in the fuel cell vehicle by the dispenser 130 (see FIG. 1).

  The variable pressure accumulator 250 stores hydrogen boosted by the compressor 230. Further, when the pressure of the high pressure accumulator 240 decreases, hydrogen is discharged from the variable pressure accumulator 250 via the suction tank 220 to the compressor 230, and the discharged hydrogen is compressed by the compressor 230. The high pressure accumulator 240 is sent out. In the present embodiment, the upper limit pressure (maximum allowable pressure) of the variable pressure accumulator 250 may be different from the upper limit pressure (82 MPa) of the high pressure accumulator 240, for example, 40 MPa.

  The pressure measuring unit 260 measures the pressure Psuc of the suction tank 220, the pressure Phpa of the high pressure accumulator 240, and the pressure Pvpa of the variable pressure accumulator 250.

  The control unit 270 is composed of a semiconductor integrated circuit including a CPU (central processing unit), reads programs and parameters for operating the CPU itself from the ROM, and cooperates with the RAM as a work area and other electronic circuits. To manage and control the entire high-pressure hydrogen production system 110.

  In the present embodiment, the control unit 270 controls the compressor 230. More specifically, the control unit 270 starts and stops the compressor 230 so that the pressure at the inlet of the compressor 230 (here, the pressure Psuc of the suction tank 220) becomes a target value TGs (for example, 0.55 MPa). Control compression capacity.

  The control unit 270 also performs drive control (output control) of the hydrogen production apparatus 210 and opening / closing control of the valves V1, V2, and V3. The valve V1 is provided in a pipe that connects the compressor 230 and the high-pressure accumulator 240, and the valve V2 is between the compressor 230 and the valve V1 in the pipe that connects the compressor 230 and the high-pressure accumulator 240. The valve V3 is provided in a pipe that connects the variable pressure accumulator 250 and the suction tank 220 to the variable pressure accumulator 250. The valves V1, V2, and V3 are constituted by on-off valves.

  Further, a pressure reducing valve RV is provided in a pipe connecting the valve V3 and the suction tank 220. The pressure reducing valve RV may be provided in a pipe connecting the variable pressure accumulator 250 and the valve V3. The set pressure of the pressure reducing valve RV is higher than the target value TGs of the suction tank 220, for example, 0.6 MPa. The drive control of the hydrogen production apparatus 210, the drive control of the compressor 230, and the opening / closing control of the valves V1, V2, and V3 will be described in detail in the operation method of the high-pressure hydrogen production system 110 described later.

(Design of capacity of high pressure accumulator 240 and variable pressure accumulator 250)
Next, the design of the capacities of the high pressure accumulator 240 and the variable pressure accumulator 250 will be described. Here, first, a specific configuration of the hydrogen production apparatus 210 and a hydrogen output amount of the hydrogen production apparatus 210 will be described. Next, the high pressure accumulator 240 and the variable pressure accumulator 250 in the high pressure hydrogen production system 110 will be described. The capacity design will be described.

(1. Specific configuration of the hydrogen production apparatus 210)
FIG. 3 is a diagram for explaining a specific configuration of the hydrogen production apparatus 210. As shown in FIG. 3 (a), the hydrogen production apparatus 210 includes a reactor 212, a heating furnace 214 that maintains the reactor 212 at a predetermined temperature (for example, 800 ° C.), and the mixing generated in the reactor 212. And a purifier 216 for purifying hydrogen from the gas.

  The reactor 212 is, for example, a steam reformer that generates a mixed gas containing hydrogen by catalyzing a fossil fuel such as city gas or liquefied petroleum gas and steam (hereinafter, fossil fuel and steam are referred to as “raw gas”). And a shift reaction vessel for generating hydrogen by reacting carbon monoxide and water vapor in the mixed gas. The purifier 216 includes a hydrogen separation membrane that purifies hydrogen from a mixed gas containing hydrogen generated by the reactor 212 and a pressure swing adsorption device (PSA). The pressure of hydrogen produced by the hydrogen production apparatus 210 (hydrogen output from the purifier 216) is, for example, 0.7 MPa.

  The hydrogen production apparatus 210 performs not only the period during which normal operation processing is performed (during operation at the maximum output (100% output)) but also the period during which output reduction processing is performed (period during which stop processing is performed). And during the period during which the power increase process is performed (including the period during which the start process is performed), hydrogen is also produced. Hereinafter, the period during which normal operation processing is performed is `` during normal operation '', the period during which output reduction processing is performed is `` output reduction processing period '', the period during which stop processing is performed is `` stop processing period '', A period in which the output increase process is performed is referred to as an “output increase process period”, and a period in which the start process is performed is referred to as a “start process period”.

  The hydrogen production apparatus 210 includes a type that produces hydrogen even in a stopped state (hereinafter referred to as “hydrogen production apparatus 210A”) and a type that stops production of hydrogen in a stopped state (hereinafter referred to as “hydrogen production apparatus 210B”). ). Hereinafter, the operation of the hydrogen production apparatuses 210A and 210B in the stopped state will be described with reference to FIGS.

  As shown in FIG. 3B, in the hydrogen production apparatus 210A, the raw material gas is supplied to the reactor 212 even in the stopped state, and a mixed gas containing hydrogen is produced. In the stopped state, the hydrogen production apparatus 210A uses the hydrogen purified by the purifier 216 as fuel for heating the reactor 212 by introducing it into the heating furnace 214, or does not purify it by the purifier 216. In addition, it is introduced into the heating furnace 214 as it is. For this reason, in the hydrogen production apparatus 210A, although the hydrogen output amount is zero in the stop state, the hydrogen production is continued, so that when the start processing command is received, the hydrogen of the rated purity is output immediately. Can do.

  On the other hand, the hydrogen production apparatus 210B is an apparatus that, in a stopped state, stops the supply of the source gas to the reactor 212 and stops the production and output of hydrogen. In the case of the hydrogen production apparatus 210B, hydrogen cannot be output immediately even if a start processing command is received in a stopped state (a state where the raw material supply is stopped). More specifically, when the hydrogen production apparatus 210B receives a stop processing command, the hydrogen output is gradually reduced to reach a minimum output (for example, 30% of the maximum output), and then to the source gas reactor 212. The production and output of hydrogen are stopped. At this time, there is an example in which the hydrogen remaining in the apparatus is circulated in the apparatus after the moisture remaining in the apparatus is purged with hydrogen. In some cases, moisture is not purged. This state is shown in FIG. When the start processing command is received from the state of FIG. 3C, the circulation of hydrogen is stopped, the raw material gas is introduced, and the operating state (temperature, pressure) of the reactor 212 and the purifier 216 in the hydrogen production apparatus 210B. Etc.) and then move to the minimum hydrogen output state. As described above, the hydrogen production apparatus 210B requires a predetermined time (for example, 90 minutes) until hydrogen is output from the state of FIG.

(2. Hydrogen output amount during normal operation, stop processing period, and start processing period in hydrogen production apparatuses 210A and 210B)
The hydrogen production apparatus 210 (210A, 210B) produces hydrogen not only during normal operation (during operation at the maximum output (100% output)) but also during the stop process period and the start process period.

  FIG. 4 is a diagram for explaining the hydrogen output amount during normal operation (output 100% operation), stop process period, and start process period in hydrogen production apparatus 210A that produces hydrogen even in a stopped state. FIG. 5 is a diagram illustrating the hydrogen output amount during normal operation (output 100% operation), stop process period, and start process period in the hydrogen production apparatus 210B that stops production of hydrogen in the stopped state. It is a figure for doing. 4 (a) and 5 (a) are diagrams for explaining the hydrogen output amount at the time of 100% output operation, and FIGS. 4 (b) and 5 (b) show the stop processing period. FIG. 4C and FIG. 5C are diagrams for explaining the hydrogen output amount in the start processing period.

When the hydrogen production apparatuses 210A and 210B are operated at an output of 100% (normal operation), for example, it is assumed that hydrogen is produced and output at 300 Nm ³ / h. Then, as shown in FIGS. 4A and 5A, when operating at an output of 100%, the hydrogen production apparatuses 210A and 210B always produce and output hydrogen at 300 Nm ³ / h. It will be.

Here, the average supply amount of hydrogen to the fuel cell vehicle (the average amount of hydrogen that can be supplied by the hydrogen production apparatuses 210A and 210B) will be described. The average supply amount of hydrogen to the fuel cell vehicle (Nm ³ / h) is , Depending on the hydrogen output capacity (Nm ³ / h) by the hydrogen production apparatuses 210A and 210B. That is, the hydrogen station 100 according to the present embodiment can supply hydrogen to the fuel cell vehicle at 300 Nm ³ / h.

  However, since the fuel cell vehicle does not necessarily visit the hydrogen station 100 on a regular basis, it is necessary to adjust the amount of hydrogen output from the hydrogen production apparatuses 210A and 210B.

  Specifically, in a period in which the number of fuel cell vehicles visiting the hydrogen station 100 is small, that is, in a period in which the amount of hydrogen supplied to the fuel cell vehicles is less than the hydrogen output amount of the hydrogen production apparatuses 210A and 210B. When the manufacturing apparatuses 210A and 210B are operating at an output of 100%, the high pressure accumulator 240 and the variable pressure accumulator 250 cannot store hydrogen. Therefore, when the high pressure accumulator 240 and the variable pressure accumulator 250 are unable to store hydrogen, the control unit 270 controls the hydrogen production apparatus 210 to start the stop process. On the other hand, when the hydrogen production apparatus 210 is stopped, a large number of fuel cell vehicles visit the hydrogen station 100, and it is likely that there is not enough hydrogen to be supplied to the fuel cell vehicle, and the hydrogen production apparatus 210 is in a stopped state. The control unit 270 controls the hydrogen production apparatus 210 to start the start process. Hereinafter, the hydrogen output amount during the stop processing period of the hydrogen production apparatuses 210A and 210B and the hydrogen output amount during the start processing period will be described.

When performing the stop process, the hydrogen production apparatus 210A gradually decreases the hydrogen output from 300 Nm ³ / h as shown in FIG. 4B, and finally stops at, for example, 90 Nm ³ / h. It will shift to the state. Here, it is assumed that the stop process requires one hour.

As described above, the hydrogen production apparatus 210A always produces hydrogen with a rated purity of 30% (90 Nm ³ / h) even in a stopped state (idling state). The hydrogen produced by the hydrogen producing apparatus 210A itself is burned and consumed. That is, in the stop state of the hydrogen production apparatus 210A, there is no hydrogen output (zero), but in reality, hydrogen is produced at 90 Nm ³ / h. Accordingly, 1 hour elapsed from the start of the stop process (transition to the stopped state), the output of hydrogen consists of 90 Nm ³ / h to ^{0 Nm} 3 / h.

Thus, in the hydrogen production apparatus 210A, hydrogen is output even during the stop processing period. In the example shown in FIG. 4B, the amount of hydrogen produced and output by the hydrogen production apparatus 210A during the stop processing period, that is, the surplus hydrogen amount A during the stop processing period (indicated by hatching in FIG. 4B). ) ^{becomes (300Nm 3 / h + 90Nm 3} / h) / 2 × 1h = 195Nm 3. Hereinafter, in order to facilitate understanding, the surplus hydrogen amount A during the stop process period is simply referred to as “surplus A”.

The start process of the hydrogen production apparatus 210A will be described. As described above, the hydrogen production apparatus 210A always supplies hydrogen with a rated purity at a load of 30% (90 Nm ³ / h) even in a stopped state (idling state). Manufacture. Therefore, when the start process is started from the stop state of the hydrogen production apparatus 210A, the hydrogen production apparatus 210A itself stops the combustion of hydrogen and immediately starts outputting hydrogen at 90 Nm ³ / h.

When performing the start process, the hydrogen production apparatus 210A gradually increases the hydrogen output from 90 Nm ³ / h as shown in FIG. 4 (c), and finally reaches 300 Nm ³ / h and outputs 100%. It will shift to driving. Here, it is assumed that one hour is required for the start processing.

As described above, hydrogen is output during the start processing period, but the output amount per unit time is small as compared with the operation of 100% output. For this reason, when it is necessary to supply hydrogen at the maximum supply capacity (300 Nm ³ / h) in the hydrogen station 100, even if all the hydrogen produced by the hydrogen production apparatus 210 is supplied during the start processing period, It will be insufficient.

In the example shown in FIG. 4C, the amount of hydrogen produced and output by the hydrogen production apparatus 210A during the start processing period and the maximum amount of hydrogen supplied to the fuel cell vehicle during the start processing period (high pressure during the start processing period). The difference from the maximum hydrogen amount delivered from the pressure accumulator 240, that is, the hydrogen amount B deficient in the start processing period (indicated by cross-hatching in FIG. 4C) is {300 Nm ³ / h− a ^{(300Nm 3 / h + 90Nm 3} / h) / 2} × 1h = 105Nm 3. Hereinafter, in order to facilitate understanding, the amount of hydrogen B deficient in the start processing period is simply referred to as “insufficient B”.

On the other hand, when performing the stop process, the hydrogen production apparatus 210B gradually decreases the hydrogen output from 300 Nm ³ / h as shown in FIG. 5B, and finally, for example, 90 Nm ³ / h. After that, the system shifts to a stopped state (hot standby state). Here, it is assumed that the stop process requires one hour.

As described above, the hydrogen production apparatus 210B produces a predetermined amount of hydrogen to be circulated to the reactor 212 for a predetermined time after shifting to the stopped state (hot standby state), but shifts to the stopped state. , Stop hydrogen output. Accordingly, the output of hydrogen and performing a stop process consists 90 Nm ³ / h to ^{0 Nm} 3 / h, the process proceeds to the stop state and passes 1 hour. The hydrogen production apparatus 210B stops the production of hydrogen when a predetermined time has elapsed after shifting to the stop state, that is, when the production of hydrogen for circulation is completed, and circulates a predetermined amount of hydrogen to the reactor 212. To maintain the temperature of reactor 212.

Similarly to the hydrogen production apparatus 210A, the hydrogen production apparatus 210B also outputs hydrogen during the stop processing period. In the example shown in FIG. 5B, the amount of hydrogen output by the hydrogen production apparatus 210B during the stop processing period, that is, the surplus A (indicated by hatching in FIG. 5B) is (300 Nm ³ / the ^{h + 90Nm 3 / h) /} 2 × 1h = 195Nm 3.

The start process of the hydrogen production apparatus 210B will be described. As described above, since the hydrogen production apparatus 210B has stopped producing hydrogen in the stopped state (hot standby state), as shown in FIG. Even if the start process is started from the stopped state, hydrogen having a rated purity cannot be output until a predetermined time (here, 1.5 hours) elapses. Therefore, the hydrogen output is zero until the predetermined time has elapsed after the start process is started. However, when the predetermined time has elapsed, the hydrogen output can be started at an output of 90 Nm ³ / h. Thereafter, the hydrogen production apparatus 210B gradually increases the hydrogen output from 90 Nm ³ / h, and finally shifts to an operation of 100% output at 300 Nm ³ / h. Here, it is assumed that the start process requires 2.5 hours.

As described above, similarly to the hydrogen production apparatus 210A, the hydrogen production apparatus 210B outputs hydrogen during the start processing period, but the output amount per unit time is small compared to the operation of 100% output. When the hydrogen supply at the maximum supply capacity (300 Nm ³ / h) in the hydrogen station 100 is required, the hydrogen becomes insufficient.

In the example shown in FIG. 5C, the difference between the amount of hydrogen output by the hydrogen production apparatus 210B during the start processing period and the maximum amount of hydrogen supplied to the fuel cell vehicle during the start processing period, that is, the shortage B (in FIG. 5 (c), the shown by cross-hatching.) becomes ^{300Nm 3 /h×2.5h-{(300Nm 3 / h + 90Nm} 3 / h) / 2 × 1h} = 555Nm 3.

In summary, the surplus A is 195 Nm ^{3 in} both the hydrogen production apparatuses 210A and 210B. Also, the shortage B is a hydrogen production apparatus 210A in 105 Nm ³ next, 555 nm ³ In the hydrogen production apparatus 210B.

(3. Design of capacity of high-pressure accumulator 240 and variable-pressure accumulator 250 in high-pressure hydrogen production system 110 according to the present embodiment)
In this embodiment, both the shortage B and the surplus A are stored in the variable pressure accumulator 250 and stored in the variable pressure accumulator 250 in order to make up for the shortage B without discarding the surplus A. Based on the amount (pressure) of hydrogen, the hydrogen production apparatus 210 is controlled to perform stop processing and start processing.

FIG. 6 is a diagram for explaining the setting of the pressure of the variable pressure accumulator 250 that is a control reference of the hydrogen production apparatus 210. In this embodiment, since both the shortage B and the surplus A are stored in the variable pressure accumulator 250, the capacity of the variable pressure accumulator 250 (upper limit pressure Qmax−lower limit pressure Qmin) is as shown in FIG. This is an amount obtained by adding the buffer amount α to the sum of the shortage B and the surplus A. Here, the buffer amount α is, for example, about 700 Nm ³ (about 12 to 15 fuel cell vehicles can be fully filled).

  When hydrogen is supplied from the variable pressure accumulator 250 to the compressor 230 (suction tank 220) with the supply of hydrogen to the fuel cell vehicle, the hydrogen stored in the variable pressure accumulator 250 decreases. When the insufficient pressure B remains in the variable pressure accumulator 250 and the hydrogen production apparatus 210 is in a stopped state, the hydrogen production apparatus 210 needs to start a start process. Therefore, when the pressure of the variable pressure accumulator 250 becomes less than the pressure PthB obtained by adding the shortage B to the lower limit pressure Qmin, the control unit 270 controls the hydrogen production apparatus 210 to start the start process. To do.

  On the other hand, when hydrogen is not supplied to the fuel cell vehicle and hydrogen is supplied from the hydrogen production apparatus 210 to the variable pressure accumulator 250, the amount of hydrogen stored in the variable pressure accumulator 250 increases. When the pressure PthA obtained by subtracting the surplus A from the upper limit pressure Qmax is exceeded, the hydrogen production apparatus 210 needs to start a stop process. Therefore, when the pressure of the variable pressure accumulator 250 exceeds the pressure corresponding to the pressure PthA, the control unit 270 controls the hydrogen production apparatus 210 to start the stop process.

  As described above, the pressure of the variable pressure accumulator 250 (second threshold, hereinafter referred to as “stop pressure PthA”), which is a control reference for the stop process by the hydrogen production apparatus 210, corresponds to the surplus A from the upper limit pressure Qmax. The pressure of the variable pressure accumulator 250 (the third threshold, hereinafter referred to as “starting pressure PthB”), which serves as a control reference for the starting process, is a pressure corresponding to the shortage B. That is, the start pressure PthB is smaller than the stop pressure PthA, and the stop pressure PthA is set based on the maximum capacity of the variable pressure accumulator 250 and the surplus A (amount of hydrogen output in the stop processing period). The start pressure PthB is the shortage B (the hydrogen amount output during the start process period and the maximum amount of hydrogen delivered from one or both of the high pressure accumulator 240 and the variable pressure accumulator 250 during the start process period). (Difference with value).

Subsequently, the design of the capacity of the high pressure accumulator 240 will be described. As described above, the variable pressure accumulator 250 has the capacity of the variable pressure accumulator 250 so that both the shortage B and the surplus A can be stored. design. Therefore, regardless of whether the hydrogen production apparatus 210A or the hydrogen production apparatus 210B is employed, the high pressure accumulator 240 uses the amount of hydrogen for fully filling one fuel cell vehicle. It only has to be stored. Therefore, the capacity of the high-pressure accumulator 240 is sufficient if it has at least a hydrogen amount (for example, 56 Nm ³ ) for fully filling one fuel cell vehicle.

(Operation method of high-pressure hydrogen production system 110)
Subsequently, an operation method of the high-pressure hydrogen production system 110 will be described. FIG. 7 is a flowchart for explaining the control flow of the hydrogen production apparatus 210, FIG. 8 is a flowchart for explaining the control flow of the compressor 230, and FIG. 9 shows the valves V1, V2, It is a flowchart for demonstrating the flow of control of V3.

(Drive control of hydrogen production apparatus 210)
As shown in FIG. 7, the control unit 270 determines whether or not the pressure Pvpa of the variable pressure accumulator 250 measured by the pressure measurement unit 260 exceeds the stop pressure PthA (second threshold) (S110). When it is determined that the pressure Pvpa of the variable pressure accumulator 250 exceeds the stop pressure PthA (YES in S110), the control unit 270 controls the hydrogen production apparatus 210 to start a stop process (S112). If the stop process has already been started, the stop process is maintained (output reduction process is performed).

  On the other hand, when the pressure Pvpa of the variable pressure accumulator 250 is equal to or lower than the stop pressure PthA (NO in S110), the control unit 270 determines whether the pressure Pvpa of the variable pressure accumulator 250 is less than the start pressure PthB (third threshold). It is determined whether or not (S114). If it is determined that the pressure Pvpa of the variable pressure accumulator 250 is less than the start pressure PthB (YES in S114), the hydrogen production apparatus 210 is controlled to start the output increase process (S116). If the output increase process has already been started, the execution of the output increase process is maintained. Further, when the pressure Pvpa of the variable pressure accumulator 250 is less than the start pressure PthB (YES in S114) and the hydrogen production apparatus 210 is in a stopped state, the hydrogen production apparatus 210 is controlled to start the start process. . If the start process has already been started, the start process is maintained.

  If it is determined that the pressure Pvpa of the variable pressure accumulator 250 is equal to or higher than the start pressure PthB (NO in S114), the control unit 270 is operating normally, that is, whether it is operating at 100% output. It is determined whether or not (S118). If it is determined that the vehicle is operating normally (YES in S118), control unit 270 keeps (maintains) the current output (S120). On the other hand, when determining that the normal operation is not performed (NO in S118), the control unit 270 performs the output increase process (loads up) and performs the normal operation (S122).

(Drive control of compressor 230)
As shown in FIG. 8, first, the control unit 270 determines whether or not the pressure Psuc of the suction tank 220 is equal to the target value TGs (S130). When it is determined that the pressure Psuc of the suction tank 220 is equal to the target value TGs (YES in S130), the control unit 270 loads (suction / discharge amount) the compressor 230 and keeps it (S132).

  On the other hand, when the pressure Psuc of the suction tank 220 is not equal to the target value TGs (NO in S130), the control unit 270 determines whether or not the pressure Psuc of the suction tank 220 is higher than the target value TGs (S134). ). If it is determined that the pressure Psuc of the suction tank 220 is higher than the target value TGs (YES in S134), the compressor 230 is loaded up (S136). On the other hand, when it is determined that the pressure Psuc of the suction tank 220 is not a pressure higher than the target value TGs, that is, lower than the target value TGs (NO in S134), the compressor 230 is loaded down (S138).

(Open / close control of valves V1, V2, and V3)
As shown in FIG. 9, first, the control unit 270 determines whether or not the pressure Phpa of the high pressure accumulator 240 is equal to or higher than a first threshold (for example, 81.5 MPa) (S150). When it is determined that the pressure Phpa of the high pressure accumulator 240 has become equal to or higher than the first threshold (YES in S150), the control unit 270 opens the valve V2 and closes the valves V1 and V3 (S152). Thus, when the high pressure accumulator 240 is filled with hydrogen, the hydrogen produced by the hydrogen production device 210 is sent to the variable pressure accumulator 250.

  On the other hand, if it is determined that the pressure Phpa of the high pressure accumulator 240 has become less than the first threshold value (NO in S150), the valve V2 is closed and the valves V1 and V3 are opened (S154). Thus, when the amount of hydrogen in the high pressure accumulator 240 decreases, either one or both of hydrogen produced by the hydrogen production device 210 and hydrogen stored in the variable pressure accumulator 250 are sent to the high pressure accumulator 240. Become.

  As described above, according to the high-pressure hydrogen production system 110 and the operation method of the high-pressure hydrogen production system 110 according to the present embodiment, the stop pressure PthA serving as the control reference for the stop process and the control reference for the start process. By making the start pressure PthB different, it is possible to reduce the frequency of stop processing and start processing by the hydrogen production apparatus 210.

When the stop pressure PthA and the start pressure PthB are set to the same value, that is, the configuration in which the capacity of the variable pressure accumulator 250 is the sum of the shortage B and the surplus A (buffer portion α = 0) is used as a comparative example. The stop pressure PthA and the start pressure PthB of the embodiment were made different, and the capacity of the variable pressure accumulator 250 was compared with a configuration in which the buffer amount α300 Nm ³ was added to the sum of the shortage B and the surplus A. Here, the simulation was performed for the case where hydrogen was supplied to the fuel cell vehicle at one unit / hour. As a result, in this embodiment, it was confirmed that the number of stop processes and the number of start processes of the hydrogen production apparatus 210 can be reduced to about ½ compared to the comparative example.

(First modification)
In the said embodiment, when the pressure Pvpa of the variable pressure accumulator 250 exceeded the stop pressure PthA, the control part 270 controlled and demonstrated the case where the hydrogen production apparatus 210 was started and a stop process was started. However, when the pressure Pvpa of the variable pressure accumulator 250 exceeds the stop pressure PthA, the control unit 270 controls the hydrogen production device 210 to reduce the output of hydrogen from the hydrogen production device 210 (load down). May be started.

  Further, for example, a fourth threshold value (a pressure in the vicinity of the upper limit pressure Qmax of the variable pressure accumulator 250, for example, 39.5 MPa) larger than the second threshold value is set, and the control unit 270 determines that the pressure Pvpa of the variable pressure accumulator 250 is When the second threshold value is exceeded, the output reduction process is started, and when the minimum output is reached, the hydrogen production apparatus 210 is loaded with the minimum output (for example, 30% output) if the second threshold value is less than the fourth threshold value. The stop process may be started when the value is equal to or greater than the fourth threshold.

(Second modification)
In the said embodiment, when the pressure Pvpa of the variable pressure accumulator 250 exceeded the stop pressure PthA, the control part 270 controlled and demonstrated the case where the hydrogen production apparatus 210 was started and a stop process was started. However, when the pressure Pvpa of the variable pressure accumulator 250 exceeds the stop pressure PthA, the control unit 270 may adjust the hydrogen output from the hydrogen production apparatus 210 according to the pressure of the variable pressure accumulator 250.

  For example, when the pressure Pvpa of the variable pressure accumulator 250 exceeds the stop pressure PthA, the control unit 270 may control the output of the hydrogen production apparatus 210 in inverse proportion to the pressure of the variable pressure accumulator 250. Specifically, the control unit 270 may control the hydrogen production apparatus 210 so that the output of hydrogen decreases as the pressure of the variable pressure accumulator 250 increases.

  Thereby, the output (load) of the hydrogen production apparatus 210 can be maintained at an optimum value, and the frequency of stop processing and start processing by the hydrogen production apparatus 210 can be greatly reduced.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to this embodiment. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  For example, in the above embodiment, the hydrogen production apparatus 210 configured to include a hydrogen separation membrane and PSA has been described as an example. However, the hydrogen production technique of the hydrogen production apparatus 210 is not limited, and various existing techniques such as a water electrolysis apparatus can be used.

  In the above embodiment, the pressure reducing valve RV may be a spring pressure reducing valve that keeps the downstream pressure mechanically constant, or may be an electronic control valve that keeps the downstream pressure constant.

  Moreover, in the said embodiment, the upper limit pressure of the variable pressure accumulator was demonstrated and demonstrated as an example the structure lower than the upper limit pressure of a high pressure accumulator. However, the upper limit pressure of the variable pressure accumulator may be higher than the upper limit pressure of the high pressure accumulator, or may be substantially equal to the upper limit pressure of the high pressure accumulator (for example, 82 MPa).

  In the second modified example, the capacity of the variable pressure accumulator 250 is set to an amount obtained by adding the buffer amount α to the sum of the shortage B and the surplus A, and hydrogen production according to the pressure of the variable pressure accumulator 250 is performed. The configuration in which the pressure at which the control of the apparatus 210 is started (stop pressure PthA) and the start pressure PthB that is the control reference for the output increase process (start process) is described as an example. However, the pressure of the variable pressure accumulator is set to the sum of the shortage B and the surplus A (buffer part α = 0), and the pressure for starting the control of the hydrogen production apparatus 210 according to the pressure of the variable pressure accumulator 250 And the pressure serving as the control reference for the start processing may be the same value (this pressure is hereinafter referred to as “trigger pressure”). In this case, when the pressure Pvpa of the variable pressure accumulator exceeds the trigger pressure, the control unit adjusts the hydrogen output from the hydrogen production apparatus 210 according to the pressure of the variable pressure accumulator. Further, when the pressure Pvpa of the variable pressure accumulator becomes less than the trigger pressure, an output increase process is performed. Note that when the pressure Pvpa of the variable pressure accumulator is less than the trigger pressure and the hydrogen production apparatus 210 is in a stopped state, the start process is started. Further, the control unit may keep (maintain) the current output of the hydrogen production apparatus 210 when the pressure Pvpa of the variable pressure accumulator is equal to the trigger pressure.

  INDUSTRIAL APPLICABILITY The present invention can be used for a high-pressure hydrogen production system that produces hydrogen and supplies it to a supplier such as a fuel cell vehicle, and a method for operating the high-pressure hydrogen production system.

110 High-pressure hydrogen production system 210 Hydrogen production device 230 Compressor 240 High-pressure accumulator (first accumulator)
250 Variable pressure accumulator (second accumulator)
260 Pressure measurement unit 270 Control unit

Claims (7)

A hydrogen production apparatus that produces and outputs hydrogen, and at least performs an output increase process that increases the output of hydrogen and an output decrease process that decreases the output of hydrogen, and
A compressor for boosting the hydrogen output from the hydrogen production device;
A first accumulator and a second accumulator for storing hydrogen boosted by the compressor;
When the pressure of the first pressure accumulator becomes equal to or higher than the first threshold value, the hydrogen output from the hydrogen production apparatus and increased in pressure by the compressor is stored in the second pressure accumulator. When the pressure of the pressure accumulator becomes less than the first threshold value, either one or both of hydrogen output from the hydrogen production apparatus and hydrogen stored in the second pressure accumulator is boosted by the compressor. When the pressure of the second pressure accumulator is stored in the first pressure accumulator and exceeds the second threshold value, the output reduction process is started, and the pressure of the second pressure accumulator is smaller than the second threshold value. A control unit that controls the hydrogen production apparatus to perform the output increase process when the value is less than a third threshold value,
With
The second pressure accumulator performs the maximum value of the amount of hydrogen delivered from the first pressure accumulator and the start process during a period in which the start process for increasing the hydrogen output from the stop state to a predetermined output is performed. Difference between the amount of hydrogen output during a period of time and a capacity capable of storing at least the amount of hydrogen output during a period of time during which a stop process is performed to reduce the output of hydrogen until reaching the stop state,
The second threshold is set based on the amount of hydrogen output during a period in which the stop process is performed,
The third threshold is based on the maximum amount of hydrogen delivered from the first pressure accumulator during the period when the start process is performed and the amount of hydrogen output during the period when the start process is performed. A high-pressure hydrogen production system characterized by being set.   2. The high-pressure hydrogen production according to claim 1, wherein when the pressure of the second pressure accumulator exceeds the second threshold value, the control unit controls the hydrogen production device to start the stop process. system. A hydrogen production apparatus that produces and outputs hydrogen, and at least performs an output increase process that increases the output of hydrogen and an output decrease process that decreases the output of hydrogen, and
A compressor for boosting the hydrogen output from the hydrogen production device;
A first accumulator and a second accumulator for storing hydrogen boosted by the compressor;
When the pressure of the first pressure accumulator becomes equal to or higher than the first threshold value, the hydrogen output from the hydrogen production apparatus and increased in pressure by the compressor is stored in the second pressure accumulator. When the pressure of the pressure accumulator becomes less than the first threshold value, either one or both of hydrogen output from the hydrogen production apparatus and hydrogen stored in the second pressure accumulator is boosted by the compressor. A control unit for storing in the first pressure accumulator;
With
The second pressure accumulator performs the maximum value of the amount of hydrogen delivered from the first pressure accumulator and the start process during a period in which the start process for increasing the hydrogen output from the stop state to a predetermined output is performed. Difference between the amount of hydrogen output during a period of time and a capacity capable of storing at least the amount of hydrogen output during a period of time during which a stop process is performed to reduce the output of hydrogen until reaching the stop state,
When the pressure of the second pressure accumulator exceeds a second threshold value set based on the amount of hydrogen output during the period during which the stop process is performed, the control unit determines the pressure of the second pressure accumulator. The high-pressure hydrogen production system is characterized in that the hydrogen output from the hydrogen production apparatus is adjusted according to the conditions. The control unit controls the hydrogen production apparatus to perform the output increase process when the pressure of the second pressure accumulator becomes less than a third threshold value smaller than the second threshold value. Item 4. The high-pressure hydrogen production system according to Item 3.   The third threshold value is the maximum value of the amount of hydrogen delivered from the first pressure accumulator during the period in which the start process for increasing the hydrogen output from the stop state to a predetermined output is performed, and the start process is performed. The high-pressure hydrogen production system according to claim 4, wherein the high-pressure hydrogen production system is set based on an amount of hydrogen output during a period. A hydrogen production apparatus that produces and outputs hydrogen, and at least performs an output increase process that increases hydrogen output and an output decrease process that decreases hydrogen output, and boosts the hydrogen output from the hydrogen production apparatus And a first pressure accumulator and a second pressure accumulator for storing hydrogen boosted by the compressor, wherein the second pressure accumulator outputs hydrogen from a stopped state to a predetermined output. The difference between the maximum value of the amount of hydrogen delivered from the first pressure accumulator during the period when the start process for increasing the amount of hydrogen is performed and the amount of hydrogen output during the period when the start process is performed, and the stop state An operation method of a high-pressure hydrogen production system having a capacity capable of storing at least the amount of hydrogen output during a period in which a stop process for reducing the output of hydrogen is performed,
Determining whether the pressure of the first pressure accumulator is equal to or greater than a first threshold;
If it is determined that the pressure of the first pressure accumulator is equal to or higher than the first threshold value, the hydrogen output from the hydrogen production apparatus and boosted by the compressor is stored in the second pressure accumulator. When it is determined that the pressure of the first pressure accumulator has become less than the first threshold value, either one or both of hydrogen output from the hydrogen production apparatus and hydrogen stored in the second pressure accumulator, Boosted by the compressor and stored in the first accumulator;
Determining whether or not the pressure of the second pressure accumulator exceeds a second threshold set based on the amount of hydrogen output during the period in which the stop process is performed;
When it is determined that the pressure of the second pressure accumulator has exceeded the second threshold, the hydrogen production apparatus is controlled to start the output reduction process,
The pressure of the second pressure accumulator is the maximum value of the amount of hydrogen delivered from the first pressure accumulator during the period when the start process is performed, and the amount of hydrogen output during the period when the start process is performed. It is determined whether or not it is less than a third threshold smaller than the second threshold set based on
A method for operating a high-pressure hydrogen production system, wherein when the pressure of the second pressure accumulator is determined to be less than the third threshold, the hydrogen production apparatus is controlled to perform the output increase process. A hydrogen production apparatus that produces and outputs hydrogen, and at least performs an output increase process for increasing the hydrogen output and an output reduction process for reducing the hydrogen output, and boosts the hydrogen output from the hydrogen production apparatus And a first pressure accumulator and a second pressure accumulator for storing hydrogen boosted by the compressor, wherein the second pressure accumulator outputs hydrogen from a stopped state to a predetermined output. The difference between the maximum value of the amount of hydrogen delivered from the first pressure accumulator during the period when the start process for increasing the amount of hydrogen is performed and the amount of hydrogen output during the period when the start process is performed, and the stop state An operation method of a high-pressure hydrogen production system having a capacity capable of storing at least the amount of hydrogen output during a period in which a stop process for reducing the output of hydrogen is performed,
Determining whether the pressure of the first pressure accumulator is equal to or greater than a first threshold;
If it is determined that the pressure of the first pressure accumulator is equal to or higher than the first threshold value, the hydrogen output from the hydrogen production apparatus and boosted by the compressor is stored in the second pressure accumulator. When it is determined that the pressure of the first pressure accumulator has become less than the first threshold value, either one or both of hydrogen output from the hydrogen production apparatus and hydrogen stored in the second pressure accumulator, Boosted by the compressor and stored in the first accumulator;
Determining whether or not the pressure of the second pressure accumulator exceeds a second threshold set based on the amount of hydrogen output during the period in which the stop process is performed;
When it is determined that the pressure of the second pressure accumulator exceeds the second threshold value, the output of hydrogen by the hydrogen production device is adjusted according to the pressure of the second pressure accumulator. Driving method.

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