Alkaline pressure electrolysis
The research center had previously developed system technology for alkaline water electrolysis in the 1 megawatt performance class. It is an alkaline pressure electrolysis, it is said.
When fully expanded, the electrolyzer should deliver around 20 kilograms of hydrogen per hour (at a pressure level of 16 bar) with an efficiency of around 70 percent. With an annual running time of 5000 hours, this is 90 tons of hydrogen. Up to this limit, electricity purchases are exempt from the EEG surcharge. With an annual running time of 8000 hours, it would even be 144 tons of hydrogen.
“Alkaline electrolysis is a well-tested and robust technology. Technically, it can be easily scaled to large performance classes,” says Marc-Simon Löffler, Head of the Department of Regenerative Energy Sources and Processes at ZSW.
In contrast to many other electrolysis technologies, the process also does not require resource-critical precious metals and rare earths. “On the one hand, this makes them cheaper. On the other hand, no raw material bottlenecks are to be expected when the market ramps up,” Löffler continues.
A good 2 million euros in funding
The system should also be designed for dynamic operation in the Power-to-X context with renewable, fluctuating electricity. It has therefore already been tested in a practical environment.
The joint project with Ecoclean will run until March 2024. The Baden-Württemberg Ministry of the Environment is funding it with around 2.1 million euros as part of the hydrogen BW future program.
80 plants per year
To date, there has not been an industrial provider in Baden-Württemberg that has taken over the production of electrolysis system technology. Ecoclean is now taking on this role. The company from Filderstadt (Baden-Württemberg) says it has expertise in the field of process engineering and industrial manufacturing processes.
According to Michael Förster, Managing Director, Ecoclean wants to market the electrolysis system technology worldwide. It is planned that the company will produce around 80 systems per year at the Dettingen site. The production of the first systems is scheduled to start in 2023.
Companies from the supply industry in Baden-Württemberg are to be involved in the project. “This should now quickly and purposefully create the conditions to drive the hydrogen economy,” announces Löffler. (jk)