Post‐combustion carbon capture is a valuable technology, capable of being deployed to meet global CO₂ emissions targets. The technology is mature and can be retrofitted easily with existing carbon emitting energy generation sources, such as natural gas combined cycles. This study investigates the effect of operating a natural gas combined cycle plant coupled with carbon capture and storage while using varying fuel compositions, with a strong focus on the influence of the CO₂ concentration in the fuel. The novelty of this study lies in exploring the technical and economic performance of the integrated system, whilst operating with different fuel compositions. The study reports the design of a natural gas combined cycle gas turbine and CO₂ capture plant (with 30 wt% monoethanolamine), which were modelled using the gCCS process modelling application. The fuel compositions analysed were varied, with focus on the CO₂ content increasing from 1% to 5%, 7.5% and 10%. The operation of the CO₂ capture plant is also investigated with focus on the CO₂ capture efficiency, specific reboiler duty and the flooding point. The economic analysis highlights the effect of the varying fuel compositions on the cost of electricity as well as the cost of CO₂ avoided. The study revealed that increased CO₂ concentrations in the fuel cause a decrease in the efficiency of the natural gas combined cycle gas turbine; however, rising the CO₂ concentration and flowrate of the flue gas improves the operation of the capture plant at the risk of an increase in the flooding velocity in the column. The economic analysis shows a slight increase in cost of electricity for fuels with higher CO₂ contents; however, the results also show a reduction in the cost of CO₂ avoided by larger margins.

中文翻译：

---

结合二氧化碳捕集装置的商业规模联合循环燃气轮机燃料灵活性的技术经济评估

燃烧后的碳捕集是一项有价值的技术，能够部署以实现全球CO ₂排放目标。该技术很成熟，可以很容易地用现有的碳排放能源产生源进行改造，例如天然气联合循环。这项研究调查了使用不同的燃料成分同时运行天然气联合循环发电厂，结合碳捕集与封存的效果，重点研究了燃料中CO ₂浓度的影响。这项研究的新颖性在于探索集成系统的技术和经济性能，同时以不同的燃料成分运行。该研究报告了天然气联合循环燃气轮机和CO _2的设计使用gCCS过程建模应用程序对捕集植物（含30 wt％单乙醇胺）进行建模。分析的燃料成分各不相同，重点是CO ₂含量从1％增加到5％，7.5％和10％。还对CO ₂捕集装置的运行进行了研究，重点是CO ₂捕集效率，特定的再沸器负荷和溢流点。经济分析突出显示了变化的燃料成分对电力成本以及避免的CO ₂成本的影响。研究表明，燃料中CO ₂浓度的增加会导致天然气联合循环燃气轮机效率的降低；但是，CO ₂上升烟气的浓度和流速提高了捕集装置的运行，但存在塔中溢流速度增加的风险。经济分析表明，CO ₂含量较高的燃料的电费略有增加；然而，结果还表明，可以通过较大幅度避免CO ₂成本的降低。