DynElectro ApS is proud to announce the results from the project “AC:DC” conducted together with DTU Energy, funded by “DTU Risø Reaktor” case no. RFS-17-0012. In the project solid oxide electrolysis cells (SOECs) were tested with a new operation method called AC:DC. The operation method decrease the degradation rate for SOECs. In the graph below AC:DC operation was used on SOEC cells from DTU Energy to conduct steam electrolysis. With AC:DC operation the cell resistance was constant after a 50 hour initiation period. In contrast, for conventional operation, the resistance increase with time.
AC:DC operation was also conducted with CO2 electrolysis for 600 hours. Here AC:DC operation was shown to reduce the degradation rate from 39 mΩcm2 per 1000 hour to 5 mΩcm2 per 1000 hour and to increase the impurity tolerance.
Microscopy data suggests the stable resistance with AC:DC operation is related to a removal of Nickel migration, which limits the lifetime of conventional operated SOECs.
The AC:DC operation method is patented by DynElectro ApS. Further info about the AC:DC operation method can be found in the published patent application.
DynElectro is happy to announce the results from the project ’DynEl ’ funded by Innovationsnetværket Smart Energy. The project results were:
1: A demonstration of electrothermal balanced operation AC:DC operation at with a commercial 1 kW SOEC stack. The AC:DC operation controls the temperature inside the SOEC stacks. This allows us to maintain a constant temperature inside the stacks, independent of the overall load. The decoupling of the temperature profile inside the stack and the load to the stack enables rapid variations of the system load without damaging the stacks. This opens for dynamic PtX. Dynamic PtX is required for production of green transportation fuels while balancing the load from the PtX system with the intermittent power production from wind and solar.
2: A concept and design for a cost efficient power converter enabling AC:DC operation of SOEC stacks in a MW-scale PtX system. The scalable converter is uniquely designed to avoid noise on the electricity grid while providing dynamic operation of the SOECs. In addition the controller can provide capacity for load-balancing and ancillary services such as reactive power, voltage control or frequency containment reserves (FCR).
3: A report written together with Centrica PlC and Hybrid Greentech analyzing the profitability of co-producing hydrogen and ancillary services to either the FCR, FCR-N or the FCR-D markets. The figure below shows high internal rates of return (IRR) with a 10-year investment horizon can be achieved with small- (~0.33 MW), and medium- (~17 MW) scale SOEC systems. If the SOEC lifetime can be increased to 5 years, the IRR exceeds that of AEC-based systems.
IRR10 yr, for Small- (0.33 MW) and Medium-sized (17 MW) SOEC based systems co-producing H2 and FCR reserves. IRR10 yr is calculated for 2 and 5 year SOEC stack lifetime using forecasted 2025 spot market electricity prices incl. tariffs  and turn-key SOEC system prices .
. PTX I DANMARK FØR 2030 - Potentiale for PtX i Danmark på kortere sigt i et systemperspektiv. Energinet. 2019 Contract No.: 18/07002-7.
. Technology Data for Renewable Fuels. Energinet and Danish Energy Agency, June 2017.
Innovation project ’ACDC ’
Mar - Dec 2019
120.000 DKK under ’Teknologisamarbejde i Region Sjælland’
“DTU Risø Reaktor”
Case no. RFS-17-0012
Innovationsnetværket Smart Energy boble project ’DynEl’