Evaluation of natural gas combined cycle power plant for post-combustion CO2 capture integration
Evaluation of natural gas combined cycle power plant for post-combustion CO2 capture integration
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DOI：
10.1016/j.ijggc.2013.10.003
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发表时间：
2013-11
影响因子：
3.9
通讯作者：
Chechet Biliyok;H. Yeung
中科院分区：
文献类型：
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作者：
Chechet Biliyok;H. Yeung
在未来十年，燃气发电厂预计将占全球产量的很大份额。需要二氧化碳捕获来减少相关排放。因此，高保真模型的440 MW天然气联合循环电厂，CO2捕集厂和CO2压缩火车建立和集成为90%的捕获水平。据观察，发电量下降了15%，而冷却水需求增加了33%。40%的废气再循环（EGR）导致10 MW的功率回收，但进一步增加了冷却水需求。结果表明，较高的废气CO2浓度增强了捕集装置中的传质，从而降低了其蒸汽需求。观察到废气的补充燃烧（SF）通常改善了设备输出。通过自下而上的方法进行的经济分析显示，综合工厂的隔夜成本比发电厂的成本高出58%，阻碍了CO2捕获的部署。EGR的影响是微不足道的，而SF的实施几乎使隔夜成本增加一倍。集成工厂的电力成本增加了30%，但EGR仅增加了26%，SF仅增加了24%。然而，天然气价格仍然是电力成本的最大贡献者。
Over the coming decade, gas-fired power plants are projected to account for a substantial share of global output. CO2capture would be required to mitigate the associated emissions. Thus, high fidelity models of a 440 MW natural gas combined cycle power plant, a CO2capture plant and a CO2compression train were built and integrated for 90% capture level. Power output is observed to fall by 15%, while cooling water demand increases by 33%. A 40% exhaust gas recirculation (EGR) causes a 10 MW power recovery, but increases cooling water demand further. It is shown that higher exhaust gas CO2concentration enhances mass transfer in the capture plant, which reduces its steam requirement. Supplementary firing (SF) of the exhaust gas is observed to generally improve the plant output. Economic analysis, performed via a bottom-up approach, reveals integrated plant overnight cost to be 58% higher than the power plant cost, discouraging deployment of CO2capture. The impact of EGR is marginal, while SF implementation almost doubles the overnight cost. Cost of electricity increases by 30% for the integrated plant, but only by 26% with EGR, and 24% with SF. However, the price of gas remains the largest contributor to cost of electricity.