公开(公告)号：US20220316081A1

公开(公告)日：2022-10-06

申请号：US17595861

申请日：2020-04-22

申请人： ASAHI KASEI KABUSHIKI KAISHA

发明人： Jun OHNO ,  Yousuke UCHINO

IPC分类号： C25B15/02 ,  C25B9/19

摘要： Provided is a method of operating an electrolysis apparatus that can inhibit electrode degradation under a variable power supply. The method of operating an electrolysis apparatus includes: an energization step in which electrolysis of electrolyte is performed in an anode compartment including an anode and a cathode compartment including a cathode that are partitioned from each other by a membrane; a suspension step in which electrolysis of electrolyte in the anode compartment and the cathode compartment is suspended; and a discharge step of, in the suspension step, electrically connecting an electrolyzer of the electrolysis apparatus to an external load and adjusting a cell voltage to 0.1 V or less in 5 hours or less.

公开(公告)号：US20220106695A1

公开(公告)日：2022-04-07

申请号：US17289591

申请日：2019-10-21

申请人： ASAHI KASEI KABUSHIKI KAISHA

发明人： Yousuke UCHINO ,  Norikazu FUJIMOTO ,  Jun OHNO

IPC分类号： C25B15/08 ,  C25B1/04 ,  C25B9/73

摘要： A method of producing hydrogen using a water electrolysis system comprising at least an electrolyzer and a purifier for removing oxygen in a hydrogen gas generated in the electrolyzer. The method includes controlling a concentration of oxygen in a hydrogen gas to be introduced to the purifier to be constantly less than 0.5 volume % when the electrolyzer is operated at least under a current density of 0.5 kA/m2 or greater; and further controlling Ob/Oa to be less than 10.0, where Oa represents the concentration of oxygen in the hydrogen gas to be introduced to the purifier when the electrolyzer is operated under a current density of 2.0 kA/m2, and Ob represents the concentration of oxygen in the hydrogen gas to be introduced to the purifier when the electrolyzer is operated under a current density of 0.2 kA/m2.

公开(公告)号：US20240003028A1

公开(公告)日：2024-01-04

申请号：US18255712

申请日：2021-12-07

申请人： ASAHI KASEI KABUSHIKI KAISHA

发明人： Yousuke UCHINO ,  Jun OHNO

IPC分类号： C25B15/08 ,  C25B9/70 ,  C25B9/67 ,  C25B1/04 ,  C25B9/17

CPC分类号： C25B15/083 ,  C25B9/70 ,  C25B9/67 ,  C25B1/04 ,  C25B9/17

摘要： An alkaline water electrolysis system (70) includes a rectifier (74) that is connected to a fluctuating power source and converts an AC power to a DC power; a plurality of bipolar electrolyzers (50_1) to (50_N) that generate hydrogen and oxygen through electrolysis of water using an electrolytic solution based on a predetermined DC voltage supplied from the rectifier 74; gas-liquid separation tanks (72) that are connected to the plurality of bipolar electrolyzers (50_1) to (50_N), and separate the hydrogen and the oxygen from the electrolytic solution and store the electrolytic solution; and open/close valves (62) provided between the gas-liquid separation tanks (72) and the bipolar electrolyzers (50).

公开(公告)号：US20230227985A1

公开(公告)日：2023-07-20

申请号：US17998258

申请日：2021-04-07

申请人： ASAHI KASEI KABUSHIKI KAISHA

发明人： Yasuhiro FUJITA ,  Hisanao AOKI ,  Yousuke UCHINO ,  Jun OHNO

IPC分类号： C25B9/19 ,  C25B1/04 ,  C25B15/025 ,  C25B15/08

CPC分类号： C25B9/19 ,  C25B1/04 ,  C25B15/025 ,  C25B15/08

摘要： An object of the present disclosure is to suppress mixing of gases generated during an operation when supply of electric power is stopped, to thereby shorten the time required for restarting after the electric power is stopped. An electrolysis system of the present disclosure includes an electrolyzer including an electrolytic cell in which an anode and a cathode are overlapped with each other having a diaphragm interposed therebetween, and a liquid surface level control unit which is operated when an electric conduction to the electrolyzer is stopped to adjust a liquid surface level of an electrolytic solution in the electrolytic cell.