Novel cryogenic carbon dioxide capture and storage process using LNG cold energy in a natural gas combined cycle power plant

This study proposes a novel cryogenic CO₂ capture and storage (CCS) process using liquefied natural gas (LNG) cold energy in a natural gas combined cycle (NGCC) power plant. This study makes two major contributions to the literature. First, the cryogenic solid-phase CCS process using LNG cold energy can effectively reduce the efficiency penalty in NGCC power plants by solving the fundamental problems associated with the conventional CCS process: energy-intensive thermal treatment of the monoethanolamine-based absorption process and significant power consumption for compressing CO₂ to 150 bar. Second, the cryogenic CCS process requires minimal equipment installation in the NGCC power plant by integrating LNG cold energy utilization and CO₂ capture processes. The proposed cryogenic CCS process reduces the efficiency penalty from 14.34 % to 3.51 %, with a 99.93 % CO₂ capture rate. We believe this study will provide a novel guideline for reducing the efficiency penalty by overcoming the challenges of the conventional CCS process.