浮式海上油田伴生气液化流程设计与分析

针对南海某油田伴生气的气源组分和特点，设计了无预冷的混合制冷剂液化流程（MRC）和氮膨胀液化流程，在储存条件相同而且产量相同的情况下，分析比较了两种液化流程的性能参数和流程布局。结果表明，氮膨胀液化流程功耗高于MRC流程，但是流程装置简单紧凑，占地面积小，对气源条件变化有较好的适应性，操作安全可靠，对装置晃动不敏感，开停机迅速方便，对气源条件变化有较好的适应性，是比较适合于海上油田伴生气的液化流程。本文还对氮膨胀液化进行了火用分析，指出了流程中火用损失较大的设备。

Design and analysis of liquefaction process for offshore associated-gas resources

The liquefaction processes of mixed refrigerant cycle（MRC）and nitrogen expander cycle（N₂ expander）for the special offshore associated-gas resources in South China Sea，have been designed and studied.The main performance parameters of these liquefaction processes have been compared at the same storage conditions and output of LNG.The layouts on LNG-FPSO for the two processes have also been compared and analyzed.The results reveal that the N₂ expander is more suitable for offshore applications considering its many advantages such as simpler and more compact，more adaptable to the natural gases of different components，safer，and less sensitive to the motion of floating equipments，in spite of its shortcomings of higher power consumption and poorer economic performance.In addition，the exergy analysis is carried out for N₂ expander.