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This study aims at presenting important aspects in developing the pressurized SOFC/GT hybrid system, such as different types of system configurations, characteristics of matching between SOFC and GT and effects of design constraints. Assorted system configurations, depending on component design technologies, are analyzed and their performances are comparatively evaluated. Various options considered are internal and external reforming processes, reforming steam supply methods and reforming heat sources. Performances are examined in terms of matching of cell temperature and turbine inlet temperature. Performance limitation caused by practical matching of those parameters under additional constraints on the cell stack (temperature difference at the cell) is investigated. Performances of the hybrid systems are also compared with those of the SOFC only systems under identical constraints and the extent of performance enhancement is evaluated. In order for the system to reach a comparable level of efficiency with internal reforming, the system having external reforming requires both high operating temperature of the cell and large temperature difference at the cell. With a practical design constraint, the internally reformed system is more efficient and this superiority becomes increasingly evident as the constraint becomes more severe.

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Abstract-In this paper, the detailed mathematical models are established for solid oxide fuel cell-humid air turbine (SOFC-HAT) combined cycle system, and the performances of the combined system are analyzed under variable conditions such as the fuel flow, pressure ratio and turbine initial temperature. At the typical working condition, the system efficiency reaches 73.86%, which is far more than that of the usual HAT cycle as well as the system combined with SOFC. The results disclosed in this paper can help to understand basic rules of the integrated system of SOFC and HAT so as to provide guidance for the design and operation of SOFC-HAT combined system.