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A Partial Oxidation Technique for Fuel-Cell Anode Exhaust-Gas Synthesis

This paper describes the performance of a gas generator used to synthesize the exhaust gas from the anode of a molten-carbonate fuel cell. The composition of this gas is estimated to be that of equilibrium at 1,250 ° F and 1 atm: 48% CO 2 , 39% H 2 O, 5% CO, and 8% H 2 , with an energy content of approximately 39 Btu/scf (higher heating value). To synthesize a range of gas compositions around this point, the gas generator partially oxidizes a mixture of CH 4 , O 2 , and CO 2 to generate energy densities between 20 and 60 Btu/scf at temperatures between 1,198 and 1,350 ° F. Results show that the technique provides a relatively high ratio of CO to H2 concentrations compared with the target composition (CO:H 2 of 2, versus 0.71). A detailed chemical model shows that the likely cause is quenching of the CO and H 2 chemistry below 2,000 ° F.