Carbon dioxide recovery apparatus and carbon dioxide recovery method

A carbon dioxide recovery apparatus comprising:

• a first adsorption chamber having an intake port and an exhaust port open to an atmosphere;
• a fan that is configured to form a flow of air in a direction from the intake port toward the exhaust port;
• a damper that is configured to close the exhaust port;
• a first adsorption unit that is disposed in the first adsorption chamber and is configured to adsorb carbon dioxide contained in air;
• a second adsorption chamber that is formed alongside the first adsorption chamber;
• a connecting pipe that connects the first adsorption chamber and the second adsorption chamber to each other;
• a second adsorption unit that is disposed in the second adsorption chamber and is configured to adsorb carbon dioxide contained in a gas flowing into the second adsorption chamber from the connecting pipe;
• an on-off valve that is provided on the connecting pipe;
• a first desorption unit that is configured to desorb the carbon dioxide absorbed by the first adsorption unit;
• a second desorption unit that is configured to desorb the carbon dioxide absorbed by the second adsorption unit;
• and
• a suction unit that is connected to the second adsorption unit and is configured to suck gases in the first adsorption chamber and the second adsorption chamber.