摘要: 本文对空气分离系统中最重要的能耗进行了深入的分析。空分能耗可以分成三类：压缩功、分离功和液化功。作者分别使用了经典计算方法和火用计算方法来计算上述三类功，并且得出完全相同的结果。在文末，作者指出：火用计算方法就像一把万能钥匙，不管中间发生的过程如何，比如说压缩、换热和精馏，也不管是压缩功、分离功和液化功，只要知道起始和终了状态，通过 E = h - T0 x S 分别算出起始和终了状态的火用，两者之差即为要使该过程发生的最小功。
关键词: 火用；有效能；火用损；空分流程；功耗；分离功；压缩功；液化功；氧气；氮气；液氧；液氮
Abstract: The most important energy consumption of Air Separation Unit is analyzed comprehensively. Energy consumption of ASU can be divided into three categories: compression, separation and liquefaction. The classical and EXERGY calculation methods are used to calculate them and achieve the same results. In the end, the author concludes that: EXERGY calculation method is just like an almighty key to solve all the problems, whatever the intermediate processes are, such as compression, heat exchanger and distillation; whatever needs to be calculated, such as compression, separation and liquefaction energy; once the beginning and ending conditions are known, through E = h - T0 x S the EXERGY of beginning and ending conditions can be calculated and the EXERGY difference is the minimum energy to drive the process.
Keywords: Exergy; Available energy; Exergy loss; Air separation process; Power consumption; Energy of separation, compression and liquefaction；oxygen; nitrogen; liquid oxygen; liquid nitrogen
