Novel Steam Constant-Pressure Pumped Hydro with Compressed Air Energy Storage System and Thermodynamic Analysis[J]. 2021, 55(6): 84-91.
DOI:
Novel Steam Constant-Pressure Pumped Hydro with Compressed Air Energy Storage System and Thermodynamic Analysis[J]. 2021, 55(6): 84-91.DOI: 10.7652/xjtuxb202106011.
Novel Steam Constant-Pressure Pumped Hydro with Compressed Air Energy Storage System and Thermodynamic Analysis
In view of off-design working condition characteristics of the original pumped hydro compressed air(PHCA)system
and based on previous research of PHCA
a novel steam constant-pressure pumped hydro combined with compressed air energy storage system is proposed. The system realizes constant pressure discharge process by using the latent heat and sensible heat released from steam
and steam also serves as working fluid after condensation
which improves energy capacity and energy density of whole system. Following the second-law of thermodynamics
the system performances are analyzed with focus on the dependence of energy efficiency and energy density on each parameter
and the exergy loss of the equipment in each part of the system is evaluated. The results show that with the increasing initial pressure
energy density of the system increases gradually
but the total efficiency decreases; with the increasing volume of a single cylinder
the total efficiency and energy density of the system reach the minimum and maximum successively; the exergy loss of steam generator and cylinder gets the highest.
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