摘要
The regeneration energies of CO 2 -lean solvent and NH 3 -washing water comprise the main fractions of the total energy consumption in an NH 3 -based post-combustion carbon capture (PCC) process. However, the reconfiguration of the CO 2 absorption process may significantly reduce the requirement for NH 3 -washing water to relieve the energy burden of regenerating it. Additionally, the utilization of a pressurized CO 2 stripper to enhance the purity of CO 2 in the overhead vapor is an alternative strategy for reducing the energy requirement for regenerating the CO 2 -lean solvent. Moreover, further energy reductions can be achieved by modifying the stripper configurations that have been reported in the literature. In this study, the energy-saving performance of the modified configurations, including the utilization of a two-stage absorber, a cold-split bypass (CSB) and an advanced flash stripper (AFS) for PCC by an NH 3 -based solvent is investigated. Our results indicate that the concentration of NH 3 slip can be reduced to a quarter of the emission by the two-stage absorber. Moreover, this study also demonstrates that the configuration of AFS is a limiting case of the CSB modification. The energy requirement of AFS is higher than that of CSB because the heat recovery by the main heat exchanger in AFS must be sacrificed to avoid solid precipitation in the reflux.