以中海油南海北部湾陆上终端项目为分析对象，研究发现天然气轻烃回收装置丙烷回收率越高，产品的收益越高，装置综合能耗越高，丙烷回收率-装置总功耗呈现指数增长趋势。采用"差价平衡法"综合分析丙烷回收率对装置总功耗和产品收益率的影响规律，对比LPG/LNG实际价差与区间LPG/LNG差价平衡点，确定装置最优丙烷回收率为92%。

CNOOCs onshore terminal project of the oil and gas field in South China Sea is analyzed.It is found that the higher the propane yield of natural gas light hydrocarbon recovery unit, the higher the product benefit and the higher the comprehensive energy consumption of the unit.Total power consumption of the unit increases exponentially with the increase of propane recovery.The effect of propane recovery rate on total power consumption and product benefit of the unit is comprehensively analyzed by means of "price variance balance method", and the optimal propane recovery rate is determined as 92% by comparing actual LPG/LNG price variance with the balance point of LPG/LNG price variance in the interval.