Development of High Efficient Multi Fuel Reversible Solid Oxide Electrolyzer Systems

Power-to-Gas-to-Power (PtG) technologies offer strong potentials for energy markets with highly stochastic energy production from renewable sources. However, usability and cost effectiveness still remain major challenges. This paper presents reversible SOE system designs for H2 and CH4 production as well as multifuel SOFC power production respectively. The multiuse and multifuel character of those systems is in accordance with a minimal design, reducing components and complexity. The concepts have been simulated and the simulation methods have been verified on the test rig with an overall electrical H2 production efficiency of 80%el. The paper explains the major challenges of a combined reversible SOE system and describes the current developments.