Reclaiming device, reclaiming method, and recovery unit for CO2 or H2S or both

A reclaiming device comprising:

• an evaporator that is configured to introduce a part of an absorbent to recover CO2 or H2S in a gas in a closed system recovery unit through an introduction line and separate a degraded substance contained in the absorbent from the absorbent;
• a heating section that is provided on a circulation line configured to draw off the absorbent from the evaporator and circulate the absorbent therein, and is configured to heat the circulating absorbent to obtain recovery steam containing an absorbent and CO2 or H2S;
• a recovery steam discharge line that is configured to discharge the recovery steam from a top side of the evaporator;
• a concentrate drawing off line that is drawn off from the circulation line and is configured to supply a concentrate from a bottom side of the evaporator;
• a cooler that is interposed on the concentrate drawing off line and is configured to cool the concentrate;
• an ionic degraded substance removal section that is configured to remove an ionic degraded substance in the cooled concentrate;
• wherein
• a concentrated waste water line that is branched off from the concentrated drawing off line and is configured to discharge a concentrated waste water;
• and
• a first on-off valve that is provided between the branched portion of the concentrated waste water line and the cooler on the concentrated drawing off line, wherein
• the reclaiming device is configured to concentrate an absorbent containing the degraded substance in the evaporator by closing the first on-off valve to concentrate the degraded substance and discharge the concentrated waste water to the outside through the concentrated waste water line.