Abstract
There is a demand for developments of a distributed energy system using a small scale gas turbine. The steam injection configurations can improve the performances of the simple and regenerative gas turbine cycles. In this study, the thermal efficiency and exergy loss of two types of regenerative steam injection gas turbine (RSTIG) system are analyzed, and the performances of them are compared with those of the regenerative, water injection and STIG systems. It is noted that the optimum pressure ratio of the RSTIG systems becomes relatively low. The thermal efficiency of the RSTIG systems is higher than that of the water injection and STIG systems. The specific power of them is larger than that of the regenerative cycle. The steam injection configurations can be applied to the flexible heat and power generation system. The total efficiency of the heat and power generation of the RSTIG systems reaches more than 70% (HHV).
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