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针对以乙烯深冷分离系统为代表的低温精馏过程合成问题。低温精馏系统包括精馏序列以及与之对应的换热网络和制冷系统。依据轴功目标方法,低温分离系统的能耗可以归结到制冷系统的轴功上,且过程的轴功消耗可以不经过换热网络和制冷系统的合成而直接得到。本文以轴功消耗作为优化目标建立数学模型,在模型中不包含换热网络和制冷系统结构的情况下建立精馏序列与对应轴功消耗的关系。这样,在不增加问题复杂程度的前提下实现对系统总能耗的优化。对乙烯冷端分离系统的合成的算例研究表明,通过基于轴功目标的数学模型可以高效的得到具有最低轴功消耗的精馏系统。
Aiming at the synthesis of cryogenic distillation process represented by ethylene cryogenic separation system. The cryogenic rectification system includes the distillation sequence and the corresponding heat exchange network and refrigeration system. According to the shaft target method, the energy consumption of the cryogenic separation system can be attributed to the shaft work of the refrigeration system, and the shaft work consumption of the process can be obtained directly without the synthesis of the heat exchange network and the refrigeration system. In this paper, the mathematical model of shaft power consumption is taken as the optimization goal. The relationship between the rectification sequence and the corresponding shaft power consumption is established when the model does not include the structure of heat exchange network and refrigeration system. In this way, the total system energy consumption is optimized without increasing the complexity of the problem. A case study on the synthesis of ethylene cold end separation system shows that the distillation system with the lowest shaft work energy consumption can be obtained efficiently through the mathematical model based on the shaft work target.