Abstract
Microtubular solid oxide fuel cell (mTSOFC) is a clean and low carbon emission power generation technology that has great prospects in the field of portable power generation. Improving the efficiency and broadening the variety of available fuels can significantly improve the performance of portable power generation devices based on mTSOFC. In this study, mTSOFC stack assembled by mounting modular sub-stacks in an array on a designed fuel/air distribution base were tested. By changing the connection of the current collection nodes, the influence of circuit connection modes on the overall output performance of the stack was studied. At a temperature of 700℃ and a fuel feed of hydrogen, the mTSOFC stack composed of 6 sub-stacks can achieve a maximum power of 353W. Fuel cascade utilization was realized by transferring the spent fuel gas from the upstream sub-stacks to the downstream sub-stacks. A maximum power generation efficiency of 45.67% was achieved in the two-cascade stack. The feasibility of using hydrogen, ammonia, propane and diesel as fuel for the mTSOFC stack has also been experimentally verified. A total continuous discharge time of 21h was achieved at an average power ≥ 190W under ammonia feeding conditions.
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