Carbon dioxide recovery system

A carbon dioxide recovery system that recovers carbon dioxide from a mixed gas containing carbon dioxide by an electrochemical reaction, the system comprising:

• a carbon dioxide recovery tank configured to store recovered carbon dioxide;
• a recovery device including a housing into which the mixed gas is supplied, and an electrochemical cell housed in the housing, the electrochemical cell including a working electrode having an adsorbent capable of adsorbing carbon dioxide, and a counter electrode paired with the working electrode;
• a sensor configured to detect a recovery amount that is an amount of carbon dioxide recovered in the recovery device and sent to the carbon dioxide recovery tank;
• a storage unit that stores adsorption-amount change data indicating association between a target adsorption amount and an adsorption time period, and recovery-amount change data indicating association between a change in the recovery amount and the target adsorption amount, the target adsorption amount being an amount of carbon dioxide that can be adsorbed by the adsorbent;
• and
• a controller configured to execute an adsorption mode in which carbon dioxide is adsorbed and a recovery mode in which carbon dioxide is recovered, wherein
• the controller is configured to:
• apply a first potential between the working electrode and the counter electrode only for an adsorption time period in the adsorption mode such that the adsorbent adsorbs carbon dioxide, the adsorption time period corresponding to a target adsorption amount that is an amount of carbon dioxide that can be adsorbed by the adsorbent, and
• apply a second potential between the working electrode and the counter electrode only for a recovery time period in the recovery mode such that the carbon dioxide adsorbed by the adsorbent is desorbed, and
• the controller is configured to
• acquire the target adsorption amount from the recovery-amount change data as a correlation value correlated with the recovery amount that is a detection result of the sensor, and
• acquire the adsorption time period from the adsorption-amount change data based on the acquired target adsorption amount.