Abstract
In the present study, chemical equilibrium FactSage computations with an actual flammable off-gas have been firstly done for designing a prototype O2 reducing apparatus to convert the off-gas into safe SOFC fuel and determining a thermal pretreating temperature range. O2 reducing experiments from simulated flammable off-gases as thermal pretreatments before feeding to the SOFC anode side have been carried out.O2 concentration can be reduced in proportion to the Ni surface area, reaching the minimum concentration of about 0.16 vol% from its initial value of 10.2 vol% with the Ni surface areas of 562 m2/m3 at 1073 K. H2 and CO concentrations of the objective SOFC fuel constituents are close to their respective initial concentrations, due to accelerated Boudouard reactions and reverse shift reaction. Concentration of H2 plus CO reached the maximum value at 537 m2/m3 of Ni surface area, concretely 92.8% of H2 plus CO is remaining in comparison with the initial simulated flammable off-gas.Some recommended future strategies of this thermal pretreating process to convert the flammable off-gas into safe SOFC fuel are also proposed in every part through this paper so as to supply complete solutions for any global-scale problems.
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