Post-combustion capture is a bottom-up technology for achieving carbon neutrality, but the high costs associated with carbon capture are detrimental to the application of this technology. In order to investigate the sensitivities to changes in the cost of carbon capture, compression and liquefaction, the costs incurred by different process parameters and absorbent types were modelled. The results show that, increasing the number of plates in the absorption tower promotes the efficiency of CO₂ capture by absorbent, with a corresponding rise in investment costs. The increase of absorber temperature at the inlet of the absorber tower does not show a significant decrease in capture rate, but the reduction of coolant and water usage reduces the operating cost to a certain extent. In addition, the reboiling ratio has the greatest influence on the CO₂ capture rate and cost, which may be the key factor for cost reduction. At the same time, the energy consumption of the system with different liquefaction pressures and different numbers of compression stages was compared, and it is found that the lower the liquefaction pressure and the higher the number of compression stages, the higher the total cost, and the equipment investment cost and operation and maintenance cost changes more obviously, while the utility costs are less affected.

carbon emissions  /  carbon capture  /  carbon trading  /  compression and liquefaction  /  costs