Acid-gas capturing apparatus and acid gas capturing method

• Main Authors: Koshito Fujita, Mitsuru Udatsu, Tetsuya Kaseda
• Format: Patent
• Language: English
• Published: 14.03.2018
• Subjects: PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING

An acid-gas capturing method and apparatus, the apparatus comprises an absorption unit 21 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 31 is 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 50 is configured to compress the regeneration unit exhaust gas and a first cleaning unit 60 is 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. A first compression-condensate-liquid line 101 has one end connected to the compression unit 50. The first compression-condensate-liquid line is configured to mix a compression-condensate liquid, generated by the compression of the regeneration unit exhaust gas in the compression unit, into the first cleaning liquid. The acid-gas capturing method and apparatus provides an improved capture of absorbing liquid in the exhaust gases.