Tadashi Tsuji

Multi-Stage Solid Oxide Fuel Cell: Gas Turbine Combined Cycle Hybrid Power Plant System

Today, the need to develop more efficient thermal power systems that emit less greenhouse effect gas has become a paramount importance. In line with this awareness, our research has leapt into such development that the combination of SOFC and Gas Turbine could generate power at extremely high efficiency. In this paper, we would like to present our concept of Inter Cooled Multistage SOFC-GT Hybrid Power System, developed to maximize fuel heat input to the system. We propose the combination of F-class GT (TIT 1350°C class) and 5 stage SOFC as the best for the hybrid power plant system and 77% (LHV base) is achieved at high pressure ratio.Copyright

Performance Evaluation of Multi-Stage SOFC and Gas Turbine Combined Systems

Solid oxide fuel cell (SOFC) and gas turbine hybrid power generation systems have gained more and more attention with regard to the development of the high performance distributed energy systems. The SOFC can be combined with a gas turbine because the SOFC operating temperature of about 1000°C matches the turbine inlet temperature. In this study, we proposed the multi-stage type SOFC/GT combined system and compared the system performance of it with that of other combined systems using the thermal efficiency and exergy evaluation. It is noted that the thermal efficiency of the 3-stage type SOFC/GT combined system can reach more than 70% (HHV) at low pressure ratio.Copyright

Cycle Optimization and High Performance Analysis on Gas Engine-Steam/Gas Turbine Combined Cycles

The reciprocating engine has the maximum pressure and temperature in the cylinder, higher than that of the conventional gas turbines. When the gas engine is integrated with gas turbine instead of turbocharger, ETCS (the engine-turbo compound system) is composed. This paper defines the compound system with ERGT (the Engine Reheat Gas Turbine) and optimizes the engine operating condition. Natural gas firing steam/gas turbine combined cycle is selected as the standard system of thermal power plant. The higher TIT (Turbine Inlet Temperature) of gas turbine usually enables the higher power generation efficiency. This paper shows the effect of engine exhaust temperature on the cycle performance with no change of TIT and that the exhaust of 900°C increases the system power generation efficiency from 46 to 50% LHV (TIT 1 150°C) and 54 to 57% LHV (TIT 1 350°C), respectively.