Apparatus for recovering carbon dioxide

A recovery apparatus for recovering carbon dioxide, comprising:

• a first separation device for separating carbon dioxide from a carbon dioxide-containing gas by pressure swing adsorption;
• and
• a second separation device disposed downstream of the first separation device and connected thereto,
• wherein the first separation device includes:
• an adsorption column,
• a first pressurization device for supplying to the adsorption column a first pressurized gas obtained by pressurizing the gas,
• a vacuum pump for sucking a desorption gas containing carbon dioxide desorbed from an adsorbent within the adsorption column, and
• an introduction pipe for introducing part of the desorption gas into the adsorption column as a cleaning gas,
• wherein the second separation device includes:
• a concentration unit, and
• a second pressurization device for supplying to the concentration unit a second pressurized gas obtained by pressurizing the desorption gas, and
• wherein the concentration unit concentrates carbon dioxide contained in the second pressurized gas, and
• the second pressurized gas is higher in pressure than the first pressurized gas.