Solar hybrid steam injection gas turbine (STIG) cycle |
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| Authors: | Maya Livshits Abraham Kribus |
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| Affiliation: | 1. Key Laboratory of Advanced Energy and Power, Institute of Engineering Thermophysics, Chinese Academy of Sciences, P.O. Box 2706, Beijing 100190, China;2. Research Center for Clean Energy and Power, Chinese Academy of Sciences, Lianyungang, Jiangsu 222069, China;2. Abengoa, Campus Palmas Altas, 410140 Sevilla, Spain;3. German Aerospace Centre (DLR), Institute of Solar Research, Pfaffenwaldring 38-40, 70569 Stuttgart, Germany;4. Solar Turbines, Incorporated, San Diego, CA, USA;1. Harcourt Butler Technological Institute, Kanpur, U.P., India;2. Madan Mohan Malaviya University of Technology Gorakhpur, U.P., India;1. Key Laboratory of Efficient Utilization of Low and Medium Grade Energy (Tianjin University), Ministry of Education of China, Tianjin 300072, China;2. Ningbo RX New Materials Tech. Co., Ltd., Ningbo 315200, China;4. Department of Chemical Engineering, Royal Institute of Technology, SE 100 44 Stockholm, Sweden |
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| Abstract: | Solar heat at moderate temperatures around 200 °C can be utilized for augmentation of conventional steam-injection gas turbine power plants. Solar concentrating collectors for such an application can be simpler and less expensive than collectors used for current solar power plants. We perform a thermodynamic analysis of this hybrid cycle. High levels of steam-to-air ratio are investigated, leading to high power augmentation compared to the simple cycle and to conventional STIG. The Solar Fraction can reach up to 50% at the highest augmentation levels. The overall conversion efficiency from heat to electricity (average over fuel and solar contributions) can be in the range of 40–55% for typical candidate turbines. The incremental efficiency (corresponding to the added steam beyond conventional STIG) is in the range of 22–37%, corresponding to solar-to-electricity efficiency of about 15–24%, similar to and even exceeding current solar power plants using higher temperature collectors. The injected water can be recovered and recycled leading to very low water consumption of the cycle, but a very low cost condenser is required to make water recovery feasible. |
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