Optimization and load-following characteristics of 5kw-class tubular solid oxide fuel cell/gas turbine hybrid systems

Combining solid oxide fuel cell and gas turbine (SOFC/GT) system is a promising concept for future clean and efficient power generation. An SOFC/GT system exploits the complementary features of the two power plants, where the GT recuperates the energy in the SOFC exhaust stream and thereby boosting the overall system efficiency. Through model based transient analysis, however, it is shown that the intricate coupling dynamics make the transient load following very challenging. Power shutdown has been observed when the load is changed abruptly. The purpose of this study is to examine the operating characteristics of 5kW-Class SOFC/GT hybrid systems in two different configurations: single-shaft and dual-shaft gas turbine designs. The load following characteristics and advantage/disadvantage for each design are explored through model-based dynamic analysis and simulation studies.