The integration of renewable energy into industrial processes has a high potential for moving to a competitive low‐carbon economy in 2050, as targeted by the European Commission. The vision of the GrInHy project is to provide ‘green’ hydrogen via electrolysis using renewable electricity and to provide grid management services as a reversible generator in the iron‐and‐steel works of Salzgitter Flachstahl GmbH (Germany). Therefore, an reverse solid oxide cell (RSOC) system was built with a nominal electrolyzer power consumption of 150 kWAC and a power output of 30 kWAC in fuel cell operation with hydrogen, respectively, 25 kWAC with natural gas. A key outcome of the project is to prove high system efficiencies up to 84%LHV in electrolysis mode and more than 50%LHV in fuel cell mode with natural gas are achievable in a real life system. It also showed long‐term operability at degradation rates < 1% kh−1. The findings and results of the first 5,000 h of operation are presented in this paper. The GrInHy prototype demonstrates the technical feasibility of the integration of an RSOC system in an industrial environment as flexible load or power source. It proves that steam electrolyzers have reached a technical readiness that allows their scale‐up to a level at which real life customer demands can be covered.
The GrInHy project targets the industrial integration and validation of a SOC based (Solid Oxide Cell) High-Temperature Electrolyser (HTE) with a nominal electrolyser power of 150 kW AC in one scalable module. The prototype is designed as reversible generator.In the Electrolyser Mode hydrogen can be produced with an overall efficiency over 80% LHV , whereas the Fuel Cell Mode is able to generate electricity from hydrogen or natural gas with efficiencies over 50% LHV . The reversibility allows a maximized annual utilization of the prototype system by providing hydrogen or electricity e.g. for grid balancing. The system is the world's largest known HTE/RSOC unit. It will be fully integrated in an existing iron-and-steel works regarding feed streams, products and power management. This paper describes the project concept, the layout of the prototype system as well as the first results of the prototype operation obtained during lab testing.
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