Study on Optimization and characteristics of Ship-based carbon capture System based on intercooling Process

Ship-based carbon capture (SBCC) and storage technology is an effective way to realize the and emission reduction of ships and the greening of the shipping industry. In order to solve the problems of low decarbonization rate and high energy consumption issues of SBCC systems, a carbon capture model of LNG ship exhaust gas with a 3MW main engine was constructed based on ASPEN PLUS. Optimized basic process including absorber tower packing height, stripper diameter, and absorption liquid concentration process parameters were 9m, 0.74m, and 37.5%, respectively. The intercooling process was added to further improve the system decarbonization rate, and an orthogonal text was designed to explore the ideal installation parameter of intercooler. The intercool load, location, and temperature were 70%, 18, and 10°C, respectively. The advantages and disadvantages of the carbon capture capacity of the two technologies were analyzed from the aspects of solvent flow ratio and reflux ratio. It was proved that at the same processing conditions, the carbon capture amount of intercooling process was always higher than that of basic process. Adjusted solvent flow ratio intercooling process was 6.60% higher than the base process, solvent usage was reduced by 12.27%. The unit carbon capture energy consumption magnified only 0.201 MJ/kgCO2.