Acid-gas capturing apparatus and acid gas capturing method

An acid-gas capturing apparatus comprising:

• an absorption unit configured to cause an acid gas contained in a plant exhaust gas to be absorbed by an absorbing liquid, and to discharge the plant exhaust gas as an absorption-unit exhaust gas;
• a regeneration unit configured to cause the acid gas to be released from the absorbing liquid having absorbed the acid gas in the absorption unit, and to discharge the acid gas as a regeneration unit exhaust gas;
• a compression unit configured to compress the regeneration unit exhaust gas;
• and
• a first cleaning unit configured to clean the absorption-unit exhaust gas or the regeneration unit exhaust gas before it is compressed by the compression unit, by means of a first cleaning liquid;
• and
• a first compression-condensate-liquid line whose one end is connected to the compression unit, the first compression-condensate-liquid line being configured to mix a compression-condensate liquid, which is generated by the compression of the regeneration unit exhaust gas in the compression unit, into the first cleaning liquid.