 Utilization of CO 2 as cushion gas for porous media compressed air energy storageCurtis M. Oldenburg and Lehua Pan Greenhouse Gases: Science and Technology, 2013, vol. 3, issue 2, 124-135 Abstract: Porous media compressed air energy storage (PM‐CAES) and geologic carbon sequestration (GCS) can potentially be combined when CO 2 is used as the cushion gas. The large increase in density of CO 2 around its critical pressure at near‐critical temperature means that a PM‐CAES reservoir operated around the CO 2 critical pressure could potentially store more air (energy) for a given pressure rise in the reservoir. One‐dimensional (1D) radial TOUGH2 simulations of PM‐CAES with CO 2 as the cushion gas have been carried out to investigate pressurization and gas‐gas mixing effects. We find that pervasive pressure gradients in PM‐CAES make it desirable to position the air‐CO 2 interface close to the well, but cushion gas at such locations is subject to strong and undesirable air‐CO 2 mixing and subsequent production of CO 2 up the well. To avoid this negative effect, CO 2 cushion gas should be located at the far outer margins of storage reservoirs where mixing will be very slow. In such a configuration, the super‐compressibility of CO 2 will not be exploited, but CO 2 can be stored in the GCS context potentially earning significant value for the PM‐CAES project depending on the price of carbon. © 2013 Society of Chemical Industry and John Wiley & Sons, Ltd Date: 2013 Downloads: (external link) Related works: Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text Persistent link: https://EconPapers.repec.org/RePEc:wly:greenh:v:3:y:2013:i:2:p:124-135 Access Statistics for this article More articles in Greenhouse Gases: Science and Technology from Blackwell Publishing |
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