Decarbonization absorption of ship exhaust gas and solvent regeneration by a high-gravity method

• Ship exhaust gas decarbonization and solvent regeneration by a high-gravity method have been optimized. • Gas-side mass transfer coefficient prediction was improved considering the Grashof liquid Reynolds number . • Waste heat of flue gas was coupled with solvent regeneration to reduce energy consumption. Ship-based carbon capture technology is a technology that can be implemented in the short term to reduce ship carbon emissions. The high gravity reactor is smaller, suitable for limited space on ships, and resistant to ocean shaking conditions, making it ideal for the offshore decarbonization process. In this paper, the effects of liquid–gas volume ratio and rotational speed on the calculation parameters were investigated experimentally, and the mass transfer coefficient correlation was improved from the experimental data so that the relative deviation of CO 2 absorption rate was reduced to within ± 12 %. The linkage of absorption and regeneration of decarbonization by the high gravity method was studied. Comparing the CO 2 absorption efficiency and the theoretical amine liquid CO 2 loading with time under cycling conditions, the combination of high-concentration amine solution and high pore density packing has a significant advantage in increasing the CO 2 absorption rate as well as reducing energy consumption. The effects of amine regeneration temperature and regeneration flow rate on CO 2 absorption rate in the linkage experiment were studied, and exhaust gas waste heat utilization was analyzed. A temperature drop of 50 °C in the exhaust gas provides 15.4 % of the total power.