Reclaiming apparatus and method for reclaiming

A reclaiming apparatus comprising:

• a reclaimer configured to extract a lean solution that is a part of an acid gas absorbing liquid regenerated in a regenerator in a recovery unit that recovers acid gas components in gas with the acid gas absorbing liquid, and introduce and receive an extracted lean liquid;
• an alkaline agent supply pipe configured to supply an alkaline agent to an inside of the reclaimer;
• a water supply pipe configured to supply supply water to the inside of the reclaimer;
• a recovered steam discharge pipe configured to introduce recovered steam discharged from the reclaimer into the regenerator;
• a thermometer that measures temperature in the reclaimer;
• a pressure guage configured to measure pressure in the reclaimer;
• and
• a reclaimer controller configured to control pressure in the reclaimer so that temperature in the reclaimer at a timing of terminating introduction of the extracted lean liquid into the reclaimer is determined to be a standard temperature and the standard temperature is maintained when terminating the introduction of the extracted lean liquid into the reclaimer and further recovering an absorption component from a residue in the reclaimer.