Design and Simulation of CCS Fuel Cold Energy Liquefaction CO2 System for Large LNG Powered Ships Based on Aspen HYSYS

Aiming at the problem of high energy consumption in CO2 liquefaction process on a large LNG-powered ship with Carbon Capture and Storage (CCS) device, a system utilizing LNG cold energy for CO2 liquefaction was designed,the system scheme were simulated by Aspen HYSYS. Based on the key node A-1, the optimal value of cold energy utilization of the system and device under 75% working conditions of the ship is determined, and the CO2 liquefaction system using LNG cold energy is calculated according to different working conditions. When the working condition of the ship was 60%, exergy efficiency of the CO2 liquefaction system utilizing LNG cold energy reached the maximum of 57.78%, the utilization rate of LNG cold energy is about 79.69%, so the effective utilization of LNG cold energy could be realized and the energy consumption of the system liquefied CO2 was reduced at the same time.