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Diaphragm metering pump feeds demo electrolyzer

| By Gerald Ondrey

The ecoflow LDC1 M910S (photo) has a hydraulic output of 0.2 kW and was equipped with an Ex motor due to the hydrogen produced during the process. In accordance with the requirements of the application, it conveys water at up to 30°C at a flowrate of 130 L/h against 40 bars in the “Made in Baden-Württemberg” electrolysis demonstrator system. Due to possible points of contact with the KOH solution in the electrolysis stack, all components of the ecoflow unit also had to be highly resistant to chemicals. This is why the components in contact with the product are made of stainless steel 316/316L (1.4401/1.4404), and the pump head of the M900 series has a robust PTFE sandwich diaphragm. The diaphragm is monitored with patented DPS technology, which prevents interruptions caused by leaks, even when the electrolyzer is in continuous use, the company says. The 1-MWel electrolysis demonstrator system has been in operation since 2023. The demonstrator itself will eventually feed H2 into the new pipeline along the Neckar River as of 2026, as part of the H2 GeNeSiS model region at the port of Stuttgart. — LEWA GmbH, Leonberg, Germany