Method for Heat and Steam Recovery in Steam Electrolysis and Steam Electrolysis Plant

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This patent describes a method and system for recovering heat and steam during steam electrolysis using a solid oxide cell stack in a steam electrolysis plant. The innovation allows the hydrogen-steam mixture produced in the cell stack to directly transfer its heat and steam to the feed water, increasing the overall efficiency by pre-heating the feed water before it enters the cell stack.

Use CasesContent extracted from patent full text and abstract with AI.

• Hydrogen production plants aiming for higher energy efficiency
• Industrial processes requiring high-purity hydrogen
• Integration with renewable energy facilities for green hydrogen generation
• Power-to-gas systems for energy storage
• Large-scale chemical factories using electrolysis-based hydrogen

BenefitsContent extracted from patent full text and abstract with AI.

• Improved energy efficiency by recycling waste heat and steam
• Reduced operational costs due to lower external heating requirements
• Enhanced sustainability for hydrogen production
• Lower environmental impact due to energy savings
• Potential for higher output rates in industrial hydrogen generation

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Patent Abstract

The invention relates to a method for heat and steam recovery in steam electrolysis with a solid oxide cell stack in a steam electrolysis plant, wherein the steam electrolysis plant comprises the solid oxide cell stack and in the plant the feed water is first heated to approximately boiling temperature in a means for heating the feed water before it is evaporated, superheated and subsequently fed into the solid oxide cell stack, characterized in that the hydrogen-steam mixture produced in the solid oxide cell stack is brought into direct contact with the feed water in the means for heating the feed water for recovery of the heat and steam contained therein, and is thereby cooled and dried, and in return the feed water is heated to approximately boiling temperature. A steam electrolysis plant for this purpose is disclosed.