Performance analysis of regenerative steam injection gas turbine systems

摘要

In recent years, there is a demand for developments of a distributed energy system using a small scale gas turbine. The steam injection system can improve the thermal efficiency of the simple and regenerative gas turbine system. In this study, we analyzed the performances of two types of regenerative steam injection gas turbine system with respect to the thermal efficiency, specific power and exergy evaluation, and compared the performances of them with those of the simple, regenerative, water injection and Cheng cycle gas turbine injection systems. It was noted that the optimum pressure ratio of the regenerative steam injection systems becomes relatively low. The thermal efficiency of the regenerative steam injection systems is higher than that of the water injection systems and Cheng cycle, and the specific power of them is larger than that of the regenerative system. The steam injection systems can be used for the flexible heat and power generation system and the total thermal efficiency of the cogeneration systems of the regenerative steam injection has turbine can reach more than 70% (HHV).