Integration of reversible solid oxide cells with methane synthesis (ReSOC-MS) in grid stabilization
A dynamic investigation
Bin Chen (The Hong Kong Polytechnic University, TU Delft - Energy Technology, Shenzhen University)
Yashar Hajimolana (University of Twente, TU Delft - Energy Technology)
V. Venkataraman (TU Delft - Energy Technology)
Meng Ni (The Hong Kong Polytechnic University)
Aravind Purushothaman Vellayani (TU Delft - Energy Technology)
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Abstract
The power to gas concept is promising for the next generation of electrochemical energy storage and grid stabilization technologies. The fuel produced from electricity-driven fuel production can be an efficient energy carrier for excessive grid power. Here, a reversible solid oxide cell(s) system integrated with methane synthesis (ReSOC-MS) is proposed for the grid stabilization application at Mega Watts class. CH
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can be synthesized at grid surplus conditions and can be a transportation friendly energy carrier. A control strategy is proposed for this combined system, based on the grid state and H
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tank state of the system for the normal solid oxide fuel cell (SOFC) mode and solid oxide electrolysis cell (SOEC) mode. Simulation results of these two operational modes demonstrate that the ReSOC-MS can achieve 85.34% power to gas efficiency in SOEC mode and 46.95% gas to power efficiency in SOFC mode. Dynamic simulations of stepping grid state for 5000 s operation show that the power to gas efficiency can be higher than 70%, thereby successfully demonstrating the capability of grid-balancing and methane production.
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