Simulation research of charging and discharging processes of compressed air storage based on salt caverns

doi:10.3969/j.issn.2097-0706.2024.10.010

Abstract

Abstract:

In order to quantitatively analyse the thermodynamic behaviour of underground salt cavern gas storage during charging and discharging process， a thermodynamic model of salt cavern charging and discharging was constructed and simulation calculations were conducted. A comprehensive analysis was performed on the dynamic changes of salt cavern gas storage system throughout the continuous process of "charging-storage-discharging-storage". The results showed that， the gas pressure and temperature inside the salt cavern exhibited a regular pattern of "rise-fall-fall-rise"over time. In the spatial dimension， the pressure inside the salt cavern gradually increased from top to bottom due to the gravity effect， while the temperature inside the cavern showed a decreases pattern from the top to the bottom due to natural convection. In addition， if the system was not discharged promptly after the initial static gas storage period， the system would continuously lose energy，negatively impacting energy storage. Moreover，as the static gas storage period extended，the temperature of the compressed air inside the salt cavern dropped to the initial temperature before charging.

Key words: compressed air energy storage, salt cavern, charging and discharging process, thermodynamic model, simulation calculation

CLC Number:

TK02

HAO Ning, LI Zhenya, WANG Yuxuan, BIAN Wenjie. Simulation research of charging and discharging processes of compressed air storage based on salt caverns[J]. Integrated Intelligent Energy, 2024, 46(10): 73-81.

Figures/Tables 15

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材料	密度ρ/ (kg·m^-3)	导热系数k/ [W·(J·K)^-1]	比定压热容c_p/ [J·(kg·K)^-1]	黏度μ/(10^-5Pa·s)
盐岩	2 700	3.000 0	900.00
空气	理想气体	0.024 2	1 006.43	1.789