Experimental study of adsorption CO2 storage device for compressed CO2 energy storage system

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.

Automated summary

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.