Carbon dioxide gas separation device and carbon dioxide gas separation method

Abstract

[Problem] To provide a carbon dioxide gas separation device and a carbon dioxide gas separation method which make it possible to efficiently separate water from an exhaust gas which contains carbon dioxide gas. [Solution] A carbon dioxide gas separation device 1 has: an oxygen supply unit 10A; a combustion unit 12 comprising a combustion furnace 12A which is supplied with oxygen from the oxygen supply unit 10A and in which said oxygen is combusted together with supplied fuel, and a dehumidifier 40 which separates water from a combustion gas which has been generated in the combustion furnace 12A and which contains the water and carbon dioxide gas; and a water separation unit 15 into which the exhaust gas discharged from the combustion unit 12 is introduced and which separates remaining water from the exhaust gas. The water separation unit 15 is provided between the oxygen supply unit and the combustion furnace and comprises: an oxygen introduction port for introducing dry oxygen which is supplied from the oxygen supply unit 10A, an oxygen discharge port for discharging oxygen, which contains water, to the combustion unit, an exhaust gas introduction port for introducing the exhaust gas which has been discharged from the combustion unit and contains water and carbon dioxide gas; and an exhaust gas discharge port for discharging dry exhaust gas from which the water has been removed.