An MCFC stack consisting of 20 unit cells with an effective electrode area of 3,000 ㎠ was prepared and operated to verify the performance and reliability of the cells. All the porous cell components such as anode, cathode and matrix including electrolyte sheets were manufactured by the casting method. Hard-rail type separator made with AISI 316L stainless steel was used for separating fuel and oxidant gases and conducting electricity between unit cells as well. When fuel gas (H₂ : CO₂ : H₂O = 72 : 18 : 10) and oxidant gas (Air : CO₂ = 70 : 30) were supplied at a flow rate of 40% utilization to the stack at 650℃, the output power of the stack was measured as 7.6 kW at its peak time. This was much higer than the design value of 6 kW. In addition to this high performance, the standard deviation of cell voltage among 20 unit was a mere 3 mV. The stack showed little performance decay up to 1,800 hours of operation time. After an unexpected thermal cycle due to the failure of the pre-heater for fuel gas around 2,000 hours, however, the decay rate became larger accordingly with operating time. The total operation time reached 5,600 hours including 4,800 hours under load in which a total of 23,202 kWh was generated. The evaluation of the stack was quite satisfactory in general except for the difficulty in temperature control under full load.

MCFC Stack Operation Cell Performance Polarization Endurance

Bloemen LJMJ, "Fuel Cell Systems," Plenum Press, New York (1993)
Bockris JOM, "Fuel Cells: Their Electrochemistry," McGraw-Hill, New York (1969)
Hirschenhofer JH, "Fuel Cells a Handbook (Revision 3)," U.S. DOE (1994)
Hong SA, "Development of 2 kW MCFC Stack," KEPRI Report TR. 93T-JO3.97.01 (1997)
Oh IH, "Fabrication of Components for MCFC and its Critical Issues," The 3(rd) Korea-Italy Joint Workchop on Energy Technology (Fuel Cells), Seoul, Korea (1997)
Tanaka T, "Research on On-Site Internal-Reforming Molten Carbonate Fuel Cell," 1989 International Gas Research Conference, 252 (1989)