Abstract: The processes for liquefied natural gas separation，including conventional distillation，thermally coupled distillation，side-stripper，double-effect distillation and heat-integrated distillation were simulated by using rigorous models and their energy consumptions were compared. The simulated results showed that the complex distillation processes consume much less energy and operation cost than conventional distillation. The thermally coupled distillation saves energy by 21.4%，side-stripper by 13.3%，double-effect distillation by 34.7% while heat-integrated distillation by 37.6%，against the conventional process. All the complex distillation processes have good prospects of application and double-effect distillation and thermally coupled distillation arrangements are superior.

摘要： 采用严格模拟计算的方法，对液化天然气分离过程的现有常规蒸馏工艺与热耦蒸馏工艺、侧线提馏工艺、双效蒸馏工艺和热集成工艺进行了模拟，并比较了其能量消耗。模拟计算结果显示，复杂蒸馏工艺都比常规蒸馏工艺减少了能耗和操作成本。其中，热耦蒸馏工艺可比常规蒸馏工艺节能21.4%，侧线提馏工艺节约13.3％，双效蒸馏工艺可节约34.7%，热集成工艺节约则达37.6%左右，表明新工艺在此分离过程中都有较好的应用前景，尤以多效蒸馏和热耦蒸馏最有优势。