Thermodynamic research on compressed air energy storage system with turbines under sliding pressure operation

Yang He, MengWang,, Haisheng Chen, Yujie Xu and Jianqiang Deng

Energy, 2021, vol. 222, issue C

Abstract: A high-pressure stage turbine will discharge energy under sliding pressure mode in compressed air energy storage system (CAES) if without throttle valve installed upstream the turbine (NV-CAES). In this work, four high-pressure stage turbines A∼D are designed for NV-CAES with 1-D turbine loss model under four inlet pressures of 5.0 MPa, 7.0 MPa, 9.0 MPa and 11.0 MPa, respectively. Simulation results reveal that Turbine B has relatively wider working operation range and higher performance. Then, another high-pressure stage turbine in NV-CAES is designed with General performance curve (GNV-CAES) under inlet pressure 7.0 MPa. Both thermodynamic model and exergy efficiency model were built to simulation system performance of these NV-CAESs. For comparison, a CAES equipped with throttle valve (V-CAES), in which the turbine train works with constant inlet pressure, is also computed. Compared with V-CAES, GNV-CAES reduces the exergy destruction from 52.25 GJ to 46.29 GJ and improves the exergy efficiency by 3.3%. The thermodynamic comparison among NV-CAESs shows that The CAES with Turbine B shows the best performance with the storage pressure of 4.0–13.0 MPa. Thus, properly choosing design conditions of high-pressure stage turbine plays an important role to enhance performance of CAES with sliding pressure discharging mode.

Keywords: Adiabatic compressed air energy storage system; High-pressure stage turbine; Sliding pressure mode; Thermodynamics analysis; Exergy destruction (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:222:y:2021:i:c:s0360544221002279

DOI: 10.1016/j.energy.2021.119978

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