P14-15 平板型固体酸化物燃料電池とガスタービン複合発電のサイクル計算 (2)

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The planar solid oxide fuel (SOFC) with the Y_2O_3 stabilized ZrO_2 electrolyte is expected to be a candidate for the distributed power sources in the next generation to its high efficiency of power generation. In this study, we have analyzed the system performance of the SOFC and gas turbine combined cycle of about 500kW output, using a two-dimensional simulation program for planar SOFC with the internal reforming. The effects of cell temperature, SOFC pressure, recirculation ratios of fuel and air, utilization ratios of fuel and air, and average current density at SOFC on the system efficiency were analyzed under typical operating condition taking account of realistic efficiencies and heat losses. The addition of Cheng cycle to the SOFC and gas turbine combined cycle improves the system efficiency by 1∿3%. The 500kW class SOFC, gas turbine and Cheng combined cycle gives the high efficiency of 61.2% (HHV) under the typical condition when the SOFC pressure is set to about 2.0MPa. We also discussed the possibility of carbon deposition at the downstream of external and internal reformers by estimating the equilitrium carbon activities in therr possible chemical reactions for carbon deposition.
2002-06-14