Effects of water injection on generator output power augmentation in a microturbine

2017 Abstract Both water atomizing inlet air cooling (WAC) and the evaporative gas turbine cycle are methods to improve gas turbine efficiency and output using water evaporation. Especially, small-amount water injection methods which are used in WAC and the recuperative water injected (RWI) cycle are relatively easy to implement in existing turbines, and they are effective ways to increase output power for microturbines. The purposes of this study are to develop a dynamic simulator which can handle WAC and RWI operations and to clarify the quantitative contribution to power augmentation by the effect of water injection. Heat penetration from the turbine to the compressor which affects the performance of the turbine system is considered in the simulator. Simulation results are compared with measured results which were previously obtained in the operation test of the 150 kW class prototype microturbine. Good agreement is seen between the simulation and measured results for the main output data such as the compressor discharge pressure and the generator output power. In the total output power augmentation of the generator by WAC and RWI operations, about 1/3 is brought about by the reduction of the compressor driving power and about 2/3 is brought about by the increase of the turbine output power. Simulation results also show a big effect from the heat penetration to the compressor on the generator output power.

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