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为解决LNG冷能用于轻烃回收工艺存在冷能利用率低、能耗高的问题,将(用)分析方法应用于轻烃回收工艺优化中.通过建立(用)分析模型,确定LNG轻烃回收工艺系统中有效能利用的薄弱环节,以(用)效率、综合能耗、乙烷回收率为目标函数进行优化,得出优化参数,从而提高轻烃回收工艺中的冷能利用率.以某LNG接收站冷能用于轻烃回收工程实例进行验证,结果表明:工艺优化后,冷能利用率提高了8.14%,综合能耗减少了约21778.01 MJ,乙烷回收率提高了6.18%.同时,对优化工艺的经济性进行分析,结果表明:优化后年利润达到5713.24×104元,投资收益率为112.24%,投资回收期约为2年,经济效益非常可观.(图5,表7,参22)“,”When LNG cold energy is used for light hydrocarbon recovery process, the cold energy utilization rate is low and the energy consumption is high. In order to solve the problems, the exergy analysis method was applied to the optimization of light hydrocarbon recovery process. The exergy analysis model was established to confirm the weak links of effective energy utilization in LNG light hydrocarbon recovery process system. Then, it was optimized with exergy efficiency, comprehensive energy consumption, and ethane recovery rate as object functions and the optimal parameters were obtained, so as to improve the cold energy utilization rate of light hydrocarbon recovery process. Finally, this method was practically applied in one certain LNG receiving station to optimize its light hydrocarbon recovery which makes use of cold energy. It is shown that the cold energy utilization rate is increased by 8.14%, the comprehensive energy consumption is reduced by about 21 778.01 MJ, and the ethane recovery rate is increased by 6.18% after process optimization. Meanwhile, it is revealed from the economy analysis on the optimization process that the economic benefit after the optimization is quite considerable with the annual profit RMB 5 713.24×104, the rate of return 112.24% and the payback period about 2 years. It is indicated that the economic benefit is very considerable. (5 Figures, 7 Tables, 22 References)