Currently, digitalization provides new challenges and opportunities for the process industry. A frequently used keyword in this context is digital twin. In this work, the term digital twin is defined with regard to a flexible air separation unit. Furthermore, the digital twin’s core component, a highly detailed dynamic plant model, is presented. A pressure-driven approach is used as a basis for the modeling. The focus of this work is on the distillation columns. Therefore, a pressure-driven sieve tray column model is presented using design correlations for the calculation of pressure drop and both the liquid and vapor holdup. Furthermore, two industrially relevant load change scenarios are presented and discussed. A plant shutdown is simulated until a state of cold standby is reached. Then, starting from this state a cold restart is simulated. Cold standby means that the plant remains at cryogenic temperatures. Lastly, a hazard analysis is conducted.

当前，数字化为过程工业带来了新的挑战和机遇。在这种情况下，经常使用的关键字是“数字孪生”。在这项工作中，术语“数字孪生”是针对柔性空气分离单元定义的。此外，还介绍了数字孪生的核心组成部分，即高度详细的动态工厂模型。压力驱动的方法用作建模的基础。这项工作的重点是蒸馏塔。因此，提出了一种压力驱动的筛板塔模型，该模型使用设计相关性来计算压降以及液体和蒸气的滞留量。此外，提出并讨论了两种与工业相关的负载变化方案。模拟工厂关闭，直到达到冷待机状态。然后，从该状态开始模拟冷重启。冷备用意味着植物保持低温状态。最后，进行危害分析。