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Pressurised alkaline electrolysis process
O 2
Safety gas analysis H 2 in O 2
Safety gas analysis O 2 in H 2
Condensate trap
Control valve |
Demister |
Demister |
Catalytic de-oxo unit |
Cooling water
Cooling water
Water feed |
Feed water pump |
Purifier |
Gas / lye phase separator |
Regenerative twin bed dryer |
Gas / lye phase separator
Control valve
KOH management
H 2
Lye tank
Pressurised alkaline electrolysis stack
Gas purity analysis
Fresh KOH |
Recirculation pump |
Cooling water |
Filter |
Electricity
Rectifier Transformer
© 2022 sbh4 GmbH
Posco, a major South Korean steel maker, is a major investor in Hysata, one of Australia’ s leading electrolyser start-ups. Hysata, of all the green hydrogen technology innovators, undoubtedly has the greatest claim to be a mouldbreaking pioneer with its bubble-free alkaline electrolyser.
Its unparalleled high efficiency results in stunningly low operating costs, and its innovative design eliminates the need for many balanceof-plant items, reducing on-site installation complexity and equipment manufacturing costs.
Posco may be proud to have the chance to leverage this kind of technology for green steel production and to support the scale-up of electrolyser production to decarbonise other sectors.
Bricks in the wall
There is no single silver bullet behind Electric Hydrogen’ s ultra-high-current-density PEM stack. Its innovation is breaking the PEM paradigm and challenging PEM’ s reputation as an expensive electrolyser technology choice.
Its breakthrough has come from integrating a number of smart, synergistic innovations at the component level. As a result, the stack and the associated system are more cost-effective. But its magic was to look at the components and build up.
Similar things can be said about Fortescue Zero’ s rectangular pressurised alkaline stack. This design breaks the trend for this class of electrolysers, which has historically used round stacks. As with Electric Hydrogen’ s case, the high current density of Fortescue Zero’ s stack( which leads to its small size) is achieved through cumulative component-level innovations.
De Nora’ s new DRAGONFLY ® pressurised alkaline electrolyser also has a rectangular stack. A key innovation is in-cell cooling of the bipolar plate component. This decouples thermal management through lye cooling from lye recirculation for
Hydrogen Tech World | Issue 21 | April 2025 19