PROBLEM TO BE SOLVED: To provide a carbon dioxide recovery device that enables efficient recovery of carbon dioxide without increasing the size of the device by using an adsorbent in recovering the carbon dioxide generated from a biogas generation device and an internal combustion engine of a cogeneration device and supplying the recovered carbon dioxide to a plant cultivation facility and thus supplies the biogas of which purity has been enhanced through the recovery of the carbon dioxide to the internal combustion engine as fuel.SOLUTION: Exhaust gas discharged from an internal combustion engine 22 is pressure-fed to an adsorption tank 60 so as to cause carbon dioxide included in the exhaust gas to be adsorbed to a first adsorbent 72, and biogas generated by a biogas generation device 3 is pressure-fed to the adsorption tank 60 so as to cause the carbon dioxide included in the biogas to be adsorbed to the first adsorbent 72. Internal pressure of the adsorption tank 60 is reduced to desorb the adsorbed carbon dioxide from the first adsorbent 72, and the biogas pressure-fed to the adsorption tank 60 is supplied to the internal combustion engine 22 as fuel.SELECTED DRAWING: Figure 1【課題】バイオガス発生装置とコージェネレーション装置の内燃機関とから発生される二酸化炭素を回収して植物栽培施設に供給する際に吸着剤を用いることで装置を大型化することなく二酸化炭素を効率的に回収すると共に、二酸化炭素が回収されることで純度が高められたバイオガスを内燃機関に燃料として供給するようにした二酸化炭素回収装置を提供する。【解決手段】内燃機関２２から排出される排ガスを吸着タンク６０に圧送し、排ガスに含まれる二酸化炭素を第１吸着剤７２に吸着させ、バイオガス発生装置３で生成されるバイオガスを吸着タンク６０に圧送し、バイオガスに含まれる二酸化炭素を第１吸着剤７２に吸着させ、吸着タンク６０の内圧を減圧して吸着された二酸化炭素を第１吸着剤７２から脱離させると共に、吸着タンク６０に圧送されたバイオガスを内燃機関２２に燃料として供給する。【選択図】図１
