Increasing Compressed Gas Energy Storage Density Using CO 2 –N 2 Gas Mixture

Ahmad Abuheiba, Moonis R. Ally, Brennan Smith and Ayyoub Momen
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Ahmad Abuheiba: Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA
Moonis R. Ally: Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA
Brennan Smith: Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA
Ayyoub Momen: Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA

Energies, 2020, vol. 13, issue 10, 1-13

Abstract: This paper demonstrates a new method by which the energy storage density of compressed air systems is increased by 56.8% by changing the composition of the compressed gas to include a condensable component. A higher storage density of 7.33 MJ/m 3 is possible using a mixture of 88% CO 2 and 12% N 2 compared to 4.67 MJ/m 3 using pure N 2 . This ratio of gases representing an optimum mixture was determined through computer simulations that considered a variety of different proportions from pure CO 2 to pure N 2 . The computer simulations are based on a thermodynamic equilibrium model that predicts the mixture composition as a function of volume and pressure under progressive compression to ultimately identify the optimal mixture composition (88% CO 2 + 12% N 2 ). The model and simulations predict that the optimal gas mixture attains a higher energy storage density than using either of the pure gases.

Keywords: GLIDES; pumped storage; compressed air storage; vapor liquid equilibrium; binary mixture (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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