Carbon dioxide absorption system and method based on multiple absorbents

• Main Authors: MENG RUIHONG, XU DONG, ZHANG SHUAI, HAN TAO, FENG LEI, SHI XIAOHONG, FENG BAIYANG
• Format: Patent
• Language: Chinese; English
• Published: 04.08.2023
• Subjects: PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING

The invention belongs to the technical field of carbon capture, and particularly relates to a carbon dioxide absorption system and method based on multiple absorbents. The system comprises an absorption tower, a lean and rich liquid heat exchanger, a rich liquid heater and a desorption unit, the desorption unit comprises a desorption system and a falling film evaporation system which are connected in parallel, and the desorption system is used for desorbing the viscosity lt; the first heat exchange barren liquor is used for desorbing the heated pregnant liquor with the viscosity being larger than or equal to 30 mpa.s, the falling film evaporation system is used for desorbing the heated pregnant liquor with the viscosity being larger than or equal to 30 mpa.s, and the barren liquor cooler is used for cooling the first heat exchange barren liquor and then returning the first heat exchange barren liquor to the absorption tower. The system can effectively realize that the composite amine absorbent, the two-phase