Abstract
In the perspective of the transition of gas grids towards hydrogen/natural gas blends or even pure hydrogen, Solid Oxide Fuel Cells “SOFC” could play a crucial role as efficient and clean stationary Combined Heat and Power (CHP) systems, flexibly operating on different feedstocks. A SOFC short stack is analyzed experimentally under different fuel gas compositions which emulate different gas grid transition scenarios. The testing campaign is defined with the aid of a preliminary system-level simulation which assesses system architecture and operating strategy (off-gas recirculation, external reforming, etc.). Experimental tests (polarization curves and performance/efficiency maps) are run in different operating conditions in terms of fuel utilization, current loading and temperature in three gas composition scenarios. Experimental results show that – albeit the highest voltage/power is obtained with the 100%H2 scenario – the efficiency may be higher with 100%NG and blend scenarios, due to the lower energy content of the input fuel.
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