An integrated system of natural gas combined cycle (NGCC) with monoethanolamine-based (MEA-based) CO₂ capture was proposed in this study aiming to reduce the efficiency penalty of CO₂ mitigation. In the proposed system, three measures were adopted: (1) utilizing absorption heat transformer (AHT) and ejector to recover the waste heat as well as providing suitable steam for solvent regeneration; (2) recirculating part of reboiler condensate to fully utilize the superheat degree of the extracted steam, and (3) injecting reboiler condensate into the regenerative system of power cycle to reuse the surplus heat of reboiler condensate. Thermodynamic benefits and economic viability of the proposed system were compared with the de-carbonization NGCC power plant without integration. Results indicated the efficiency penalty of CO₂ capture in the proposed system decreased by 2.67 percentage points. Meanwhile, the cost of electricity and the cost of CO₂ avoided were reduced by 4.73% and 15.08%, respectively, while the adopted additional devices caused an increase of the investment by 19.12 M$.

本研究提出了一种天然气联合循环（NGCC）与基于单乙醇胺（MEA）CO ₂捕集的集成系统，旨在降低 CO ₂的效率损失减轻。在该系统中，采取了三项措施：（1）利用吸收式热转换器（AHT）和喷射器回收废热并提供合适的蒸汽用于溶剂再生；(2)再循环部分再沸器冷凝水，充分利用抽出蒸汽的过热度；(3)将再沸器冷凝水注入动力循环再生系统，再利用再沸器冷凝水余热。将拟议系统的热力学效益和经济可行性与没有集成的脱碳 NGCC 发电厂进行了比较。结果表明，在提议的系统中，CO ₂捕获的效率损失降低了 2.67 个百分点。同时，电力成本和 CO ₂成本 分别减少了 4.73% 和 15.08%，而采用的附加设备导致投资增加了 1912 万美元。