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 CO
2
liquefaction process on a large LNG-powered ship with Carbon Capture and Storage (CCS) device, a system utilizing LNG cold energy for CO
2
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 CO
2
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 CO
2
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 CO
2
was reduced at the same time.