Model development of amine scrubbing and CO2 liquefaction process using waste LNG cold energy

Jonghun Lim, Yurim Kim, Yup Yoo, Hyungtae Cho, Jaewon Lee, Jinwoo Park, Junghwan Kim

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

Abstract

Amine scrubbing and CO2 liquefaction processes are generally employed in most power plants for CO2 capture and storage (CCS) because they are suitable for large-scale plants. However, a significant amount of cold energy is required to cool the lean amine solution in the amine scrubbing system and liquefy compressed CO2. Hence, liquefied natural gas (LNG) cold energy, which is generally wasted in seawater during LNG regasification, should be recovered. In this study, we developed an amine scrubbing and CO2 liquefaction process using waste LNG cold energy. The proposed process model comprises the following three steps: (1) LNG regasification, (2) CO2 capture and regeneration, and (3) CO2 liquefaction. First, in LNG regasification, the boil-off gas (BOG) is compressed, and the LNG with compressed BOG is regasified in an LNG vaporizer. To regasify the LNG, seawater is used as a heat source, and the waste cold energy in the chilled seawater is recovered in steps 2 and 3. Second, the CO2 capture and regeneration process involves the use of an absorber and a regenerator, and the waste cold energy is recovered at the lean amine cooler to reduce the temperature of the lean amine solution. Finally, to liquefy CO2, cold energy derived from LNG regasification is recovered to a heat exchanger to cool the compressed CO2. Consequently, the total cold energy consumption can be decreased by 31% by recovering waste LNG cold energy. This increases the overall energy efficiency of the amine scrubbing and CO2 liquefaction processes for CCS using waste LNG cold energy, thus resulting in less fuel use. We believe that the proposed approach will afford significant economic improvements and environmental protection effects.

Original languageEnglish
Title of host publicationComputer Aided Chemical Engineering
PublisherElsevier B.V.
Pages1415-1420
Number of pages6
DOIs
StatePublished - Jan 2023

Publication series

NameComputer Aided Chemical Engineering
Volume52
ISSN (Print)1570-7946

Keywords

  • Amine scrubbing
  • CO capture and storage
  • CO liquefaction
  • Liquefied natural gas

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