Monoethanolamine (MEA), 2-butylaminoethanol (BEA) and diethylaminoethanol (DEEA) were employed as absorbents in a continuous hot-water decarbonization apparatus to investigate the CO₂ absorption and desorption performances of the three absorbents under specific proportions and different catalyst combinations, aiming to determine the optimal CO₂ capture strategy and reduce desorption energy consumption. The experimental results show that the CO₂ absorption and desorption performance of the 4.5 mol/L MEA-BEA-DEEA ternary amine system is superior to that of the traditional 30% (mass fraction) MEA solution. When the inlet temperature of the absorption tower is 25 ℃ and 150 g of HND-8 catalyst is added, the catalytic effect of solid acid is the best. At this time, the cyclic capacity is 46.3 mmol CO₂/min and the desorption energy consumption is 2.21 GJ/t CO₂. After adding another 30 g of dolomite on this basis, the overall performance of the system reached its peak, with the cyclic capacity increase to 53.8 mmol CO₂/min and the desorption energy consumption reduce to 1.92 GJ/t CO₂, representing a 54.3% reduction in desorption energy consumption relative to the 30% MEA solution.