| (19) |
 |
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(11) |
EP 4 047 112 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
01.03.2023 Bulletin 2023/09 |
| (43) |
Date of publication A2: |
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24.08.2022 Bulletin 2022/34 |
| (22) |
Date of filing: 02.02.2022 |
|
| (51) |
International Patent Classification (IPC):
|
|
| (84) |
Designated Contracting States: |
|
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL
NO PL PT RO RS SE SI SK SM TR |
|
Designated Extension States: |
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BA ME |
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Designated Validation States: |
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KH MA MD TN |
| (30) |
Priority: |
17.02.2021 JP 2021023663
|
| (71) |
Applicant: Hitachi, Ltd. |
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Tokyo 100-8280 (JP) |
|
| (72) |
Inventors: |
|
- WATANABE, Keiji
Chiyoda-ku, 100-8280 (JP)
- FURUTA, Futoshi
Chiyoda-ku, 100-8280 (JP)
- ISHIKAWA, Takao
Chiyoda-ku, 100-8280 (JP)
|
| (74) |
Representative: Strehl Schübel-Hopf & Partner |
|
Maximilianstrasse 54
80538 München
80538 München (DE) |
|
| |
|
| (54) |
HYDROGEN PRODUCTION SYSTEM AND HYDROGEN PRODUCTION METHOD |
(57) In a hydrogen production system that produces hydrogen using a plurality of water
electrolysis stacks, a technique is provided, which is capable of effectively restraining
a degradation of the water electrolysis stacks. In the hydrogen production system
according to the present disclosure, any one of an operation priority stack, a stop
priority stack, and an intermediate operation stack is allocated as the operation
states of the water electrolysis stacks.