Numerical study on the air distribution characteristics of the turbine regulating stage in a compressed air energy storage system

doi:10.19799/j.cnki.2095-4239.2020.0038

Abstract

Abstract:

Compressed air energy storage is considered the most promising large-scale energy storage system. Because a compressed air energy storage system operates under variable working conditions and is characterized by the long-term pressure loss between the air storage device and the inlet of the turbine, in this study, a nozzle governing mode is proposed to reduce throttling losses. Numerical calculation and analysis of a closed radial turbine in a MW-level compressed air energy storage system were performed by the computational fluid dynamics method. By adjusting the air state at the inlet of each nozzle group, the effects of air distribution on control-stage performance was studied. The results show that under the nozzle governing condition, the flow rate of the turbine varies between 0.86 and 1.42 times that of the rated flow rate, which meets the regulation requirement. The output of the regulating stage can also be increased by 11.2% at the specified flow rate compared with that using throttled governing. The abovementioned results reveal the effects of air distribution on the performance of the radial turbine, which provides a theoretical basis for the design, optimization, and system operation control of a nozzle governing radial turbine.

Key words: nozzle governing, compressed air energy storage, turbine, variable working conditions

CLC Number:

TK 472⁺.6

LIU Jiahao, WANG Xing, ZHANG Xuehui, LI Wen, ZHU Yangli, CHEN Haisheng. Numerical study on the air distribution characteristics of the turbine regulating stage in a compressed air energy storage system[J]. Energy Storage Science and Technology, 2020, 9(2): 425-434.

Figures/Tables 3

References 17

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