Post-combustion carbon capture (PCC) using a chemical solvent is the most mature and well-proven technology to mitigate carbon dioxide (CO₂) emission. However, substantial energy consumption for solvent regeneration is still a critical challenge for widespread deployment of this PCC. In this study, a novel low-energy, combined rich and lean vapor recompression (RLVR) process for the CO₂ capture process using dilute aqueous ammonia (NH₃) solvent was developed and optimized by integrating of rich vapor recompression (RVR) and lean vapor recompression (LVR) approaches. A parametric study showed that the minimum total equivalent work can be obtained when CO₂ loading and NH₃ concentration of lean solution are 0.275 mol CO₂/mol NH₃ and 5.0 wt%, respectively and the pressures of stripper, rich and lean solvent flash drums are maintained at 10.5 bar, 4.62 bar and 6.93 bar, respectively. Under such operation conditions, the total equivalent work required for a CO₂ capture plant was remarkably reduced to 0.123 kW h/kg of CO₂ captured, which is equivalent to about 10% energy penalty. This amounts to 26–54% reduction from recent literature reports. Furthermore, this combined RLVR process can completely eliminate the need of reboiler, leads to improving the flexibility of the capture plant since it can be separated from power plant steam systems.

使用化学溶剂的燃烧后碳捕集（PCC）是减轻二氧化碳（CO ₂）排放的最成熟，最成熟的技术。但是，溶剂再生的大量能量消耗仍然是PCC广泛部署的关键挑战。在这项研究中，开发了一种新型的低能量富浓和稀薄蒸汽压缩（RLVR）组合工艺，该工艺通过使用稀氨水（NH ₃）溶剂将CO ₂捕集过程进行了优化，并通过富浓蒸汽压缩（RVR）和稀薄蒸汽的集成蒸气压缩（LVR）方法。参数研究表明，当装载CO ₂和NH ₃时，可以获得最小的总当量功。稀溶液的浓度分别为0.275 mol CO ₂ / mol NH ₃和5.0 wt％，汽提塔，浓和稀溶剂闪蒸鼓的压力分别保持在10.5 bar，4.62 bar和6.93 bar。在这样的操作条件下，CO ₂捕集装置所需的总当量功显着降低至0.123 kW h / kg捕集的CO ₂，相当于约10％的能量损失。与最近的文献报道相比，减少了26-54％。此外，这种组合的RLVR工艺可以完全消除对再沸器的需求，因为可以将其与发电厂的蒸汽系统分开，从而提高了捕集装置的灵活性。