The heart of the electrolyser. In the proton exchange membrane (PEM), ultrapure water is split into hydrogen and oxygen by electric current. The SERIES S450 stack consists of a proton-permeable polymer membrane and voltage is applied to the electrodes of the cell. On the anode side, water is split into oxygen, free electrons and positively charged H+ ions. The hydrogen ions diffuse through the proton conducting membrane to the cathode side, where they combine with the electrons to form hydrogen.

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After the drying module, the hydrogen produced has a purity of 99.999 % (5.0 quality). It can be used immediately or stored at up to 30 bar. At the nominal operating point 210 Nm³/h or 450 kg/d of hydrogen are produced. It is possible to specify the H₂ production quantity, an electric power or an H₂ pressure.

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The rectifier power supply provides direct current for the electrolysis stacks. If the electricity comes from renewable energy sources such as biomass, solar or wind, the electrolyser produces “green hydrogen”.

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All components of the water electrolysis system are housed in a 40-foot container. This makes it transportable and space-saving due to its compact design.

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If process heat from the electrolyser cannot be integrated in a heating grid, residual heat is transferred to the environment via the system cooling system.

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In the unlikely event of a fault, the hydrogen blower safely releases residual gas into the environment inertised with nitrogen.

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Under nominal conditions, electrolysis requires only 210 litres of ultrapure water obtained from tap water by reverse osmosis. Following treatment, the water only has a conductivity of 10 µS/cm.

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In the case of heat integration of the electrolysis process, heat extraction at a temperature of 65°C is used. Due to this extraction, overall energy efficiency of up to 95 % can be attained.

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The O₂ released during electrolysis is discharged along with the process water. The water is not only the basic substance of the reaction, but also dissipates the heat generated in the process. After successful oxygen separation, the water can be returned to the cycle.

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Safety is a top priority at H-TEC: In the unlikely event that hydrogen escapes during system operation, the system is safely shut down.

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The produced oxygen of approx. 105 Nm³/h is released into the environment.

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