【摘要】 构建了以燃气轮机烟气为热源、LNG气化热为冷源的超临界二氧化碳（sCO₂）朗肯循环与天然气直接膨胀耦合的余热发电系统。针对300万t/a LNG气化站，开展了循环参数对热力学性能的敏感性分析以及优化计算。结果表明：该系统的总出力可达528.57 MW,可匹配约342 MW等级燃机，LNG贡献电能为0.095 7 MJ/kg,联合系统燃料热效率达到63.54%;相比传统的燃气蒸汽联合循环，系统净功提高3.5%,燃料热效率提升2.15个百分点。更多还原

【Abstract】 A waste-heat power generation system was proposed based on supercritical carbon dioxide（sCO₂） Rankine cycle coupled with the natural gas expansion, using gas turbine flue gas as the heat source and LNG as the cold source. For 3 million tons per year LNG receiving station, the sensitivity analysis and optimization calculations of cycle parameters on thermodynamic performance were carried out. Results show that the net power of system can reach 528.57 MW, which is able to match 342 MW gas turbine. LNG contributes 0.095 7 MJ/kg of electrical energy, and the thermal efficiency of the system reaches 63.54%. Compared with the traditional gas-steam combined cycle, the net power of system is increased by 3.5%, and the efficiency of system is improved by 2.15 percentage points.更多还原