DISCHARGING METHOD FOR REMAINING GAS JUST AFTER TIME OF REGENERATION IN CARBON DIOXIDE REMOVER

PURPOSE:To efficiently remove CO2, by feeding the detection value of CO2 concn. to a controller and opening both an inlet valve of treating air of an absorption reactor and an outlet valve of CO2 and discharging remaining CO2 with the treating air between a regenerating process and an absorbing process. CONSTITUTION:Firstly in an absorbing process, solenoid valves 5, 6 are opened and solenoid valves 9, 10 are closed and CO2-contg. air is fed to a reactor 1 through an inlet 3 of treating air and CO2 is absorbed with an absorbent 2 such as ion exchange resin and thereafter it is led out through an outlet 4 of cleaned air. Then in a regenerating process, the solenoid valves 9, 10 are opened and steam is fed to the reactor 1 through an inlet 7 of regenerating steam and CO2 is desorbed and discharged through an outlet 8 of carbon dioxide. Furthermore in a discharging process of remaining carbon dioxide, solenoid valves 5, 10 are opened and solenoid valves 6, 9 are closed and air is introduced through the inlet 3 to discharge remaining CO2 17. At this time, CO2 concn. detected by a CO2 densitometer 12 is fed to a controller 11 and the process shifts to the absorbing process at a point of time when the concn. reaches preset value or below.