天然气联合循环电厂燃烧后CO2捕集一体化技术经济评价

  目的  近年来，天然气发电在我国构建清洁能源体系中扮演着重要角色，预计到2025年“十四五”规划期结束时，中国气电装机容量将会突破150 GW。二氧化碳捕集利用是气电实现“双碳”目标的关键路径之一。  方法  为此，设立1个600 MW等级天然气联合循环发电（NGCC）、1个CO₂捕集和压缩（PCC）的综合工厂作为模拟对象。  结果  模拟研究表明:设计CO₂全烟气量捕集、90%效率、CO₂压缩提纯率为99.5%，燃气发电总出力输出下降了约16.05%，厂用电率增加5.55%，循环冷却水需求增加了约50.52%。  结论  通过经济分析显示，综合工厂的静态投资成本比单一发电厂的成本高54.28%，电力均等化运营成本（LCOE）增加了15.96%，给二氧化碳捕集的部署和发展带来了非常大的困难。但其中天然气价格仍然是影响电厂运营成本的最主要因素。

Economic Evaluation of Post-Combustion CO2 Capture Integration Technology in Natural Gas Combined Cycle Power Plant

  Introduction  In recent years, natural gas power generation has played an important role in the construction of clean energy system of China. By the end of the "14th Five-year Plan" in 2025, China's gas power installed capacity is expected to hit 150 million kilowatts. Carbon capture, utilization and storage (CCUS) is one of the key paths for gas power to achieve the carbon peaking and carbon neutrality goals.   Method  To this end, an integrated plant combining 600 MW natural gas combined cycle (NGCC) and CO₂ post-combustion capture (PCC) were set up as the simulation object.   Result  The simulation study shows that the design captures all CO₂ flue gas with 90% efficiency, the CO₂ compression and purification rate is 99.5%, the total output of gas power generation decreases by about 16.05%, the auxiliary power ratio increases by 5.55%, and the demand for circulating cooling water increases by about 50.52%.   Conclusion  The economic analysis shows that the static investment cost of the integrated plant is 54.28% higher than that of the single power plant, and the levelized cost of energy (LCOE) increases by 15.96%, which brings great difficulties to the deployment and development of carbon dioxide capture. However, the natural gas price is still the most important factor affecting the operating cost of the power plant.