Parametric study of turbine systems for compressed air energy storage plants

Kim, C. S.; Kartsounes, G. T.

doi:10.2172/6801581

Cited by 2 publications

(2 citation statements)

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“…In this operating mode, when expander works under variable operating conditions, ratios of actual output power to rated output power for each stage are equivalent, as shown in Equation (16). Since the expansion ratios are equal for each stage expander under design conditions, when the expander works under EPR operation, its expansion ratios for each stage are closed if isentropic efficiencies change a little.…”

Section: Epr Operationmentioning

confidence: 99%

“…Currently, most research in the field of multistage expansion in CAES systems focuses on conventional CAES. Kim et al investigated the influence of parameters of a multistage expansion process in conventional CAES on system performance and economics, but off‐design models of the components were not considered. Khaitan et al built a dynamic model for conventional CAES system, the simulation results were fitted well with the operation data of Huntorf plant, but the study did not concern the off‐design operation strategy.…”

Section: Introductionmentioning

confidence: 99%

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Off‐design performance and operation strategy of expansion process in compressed air energy systems

Guo

Zhang

et al. 2018

Int J Energy Res

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Summary Compressed air energy storage (CAES) systems usually operate under off‐design conditions due to load fluctuations, environmental factors, and performance characteristics of the system. In order to optimize design and operation of CAES systems, it is significant to study off‐design performance. The expansion process plays an important role in the whole system. The main objective of this study is to explore the off‐design characteristics and optimization strategy of the multistage expansion process of CAES systems with thermal storage. Two kinds of off‐design operating modes, which are equal‐power‐ratio (EPR) operation and optimizing variable stator vane rotation angle (OVRA) operation, are proposed and compared for the first time. Correlation between key parameters such as total output power ratio, exergy efficiency, outlet air/water temperature versus mass flow rate ratio, and inlet pressure are revealed. Furthermore, optimal operation principles are obtained. The primary optimizing operation principle is to optimize the isentropic efficiencies of low‐pressure stages to improve the whole efficiency of expansion process. Lastly, the optimized regulating law for variable stator vane is expressed in a polynomial form.

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Section: Epr Operationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%