Reversible SOCs als Bindeglied zwischen Strom-, Wärme- und Gasnetz und Plus Energie-Quartieren

The reduction of CO₂ emissions in the domestic energy sector requires alternative energy production and energy storage concepts. A future technology mix could include a system operation based on environmental circumstances: (i) produce green gases during renewable energy surplus, (ii) store them for colder seasons, and (iii) convert them back to heat and electricity during domestic energy demand. One promising system to address that challenge is fuel and electrolysis cells combined heat and power plants (CHP). The research project Cell4Life focuses on the theoretical and functional integrity of reversible solid oxide cells (rSOC) combined heat and power plants in positive energy districts (PED). The research includes the optimization of dynamic rSOC-CHP based on PED-related operation scenarios, which are presented in this study. To include the local energy infrastructure, a blending of hydrogen into the local gas grid will be discussed further on. For an urban PED, a rSOC system based on steam electrolysis in solid oxide electrolysis cell (SOEC) mode and operated with an energy demand dependent hydrogen-methane mixture in solid oxide fuel cell (SOFC) mode is proven to be the optimal solution. Based on a theoretical analysis of a real world PED, optimization scenarios for the experimental analysis were defined, which include short-term and long-term operation of rSOC-CHP.