Journal
JOURNAL OF ENERGY STORAGE
Volume 58, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.est.2022.106286
Keywords
CompressedCO2 energy storage; Low-pressureCO2 storage; Adsorption storage system; Storage capacity; Density; Heat exchange efficiency
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Compressed CO2 energy storage is a reliable solution for physical energy storage. The main challenge is achieving high-density storage of low-pressure CO2. In this study, a new adsorption transcritical compressed CO2 energy storage system was proposed, using adsorbents for low-pressure, high-density storage. The results showed that the storage density of the adsorption gas storage system was 43.46 kg/m3, 24.8 times higher than the density of CO2. Heating the adsorbents to above 160 degrees Celsius can further increase the storage density.
Compressed CO2 energy storage is a reliable physical energy storage solution. The main challenge of compressed CO2 energy storage system is how to solve the high-density storage of low-pressure CO2. In this study, we proposed a new type of adsorption transcritical compressed CO2 energy storage system. We used adsorbents to adsorb CO2 for achieving low-pressure, high-density storage of low-pressure CO2. We investigated the gas storage capacity of the adsorption storage system and the heat and mass transfer process. Results demonstrate that the storage density (57.6 degrees C-25 degrees C) of adsorption gas storage is 43.46 kg/m3, which is 24.8 times of the CO2 density (1.75 kg/m3, 30 degrees C, 1 bar). If the adsorbents are heated above 160 degrees C, then the storage density will increase 3-4 times. The whole process is controlled by heat exchange efficiency. The heat exchange efficiency greatly affects the response time of the system during the application.
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