Abstract:

Accurate and rapid simulation of chemical engineering units is crucial to the success of chemical process digital twins. As one of the most complex and widely used units in chemical engineering, the efficient and accurate solution of distillation columns is essential for the implementation of digital twins in chemical plants. However, traditional distillation column model has become a bottleneck restricting its digital twin due to its large scale and time-consuming calculation of thermodynamic properties. To address this, a efficient and short-cut distillation column model for hydrocarbon systems was developed based on the short-cut distillation column model by introducing the correlation between component equilibrium constants and temperature, thereby simplifying the phase equilibrium calculations. The model was validated by using a distillation column from an actual industrial process. The results show that the proposed efficient and short-cut distillation column model significantly reduces computation time, laying a solid foundation for digital twin modeling of distillation columns.

Key words: model reduction, process systems, computer simulation, digital twin, short-cut distillation column model

摘要：

化工单元的准确快速模拟是化工数字孪生成功实施的关键之一。精馏塔作为最复杂和应用最广泛的化工单元之一，其高效准确求解对于实现化工装置数字孪生具有重要意义。传统精馏塔模型则由于规模较大和热力学性质计算耗时等原因，形成了制约其数字孪生的瓶颈。为此，在简捷精馏塔模型基础上，引入了组分相平衡常数与温度间关联式，以简化相平衡计算，并基于此提出了烃类精馏塔的高效简捷精馏塔模型。最后，通过实际工业中的精馏塔进行验证，结果表明所提出的高效简捷精馏塔模型能有效减少计算耗时，为精馏塔的数字孪生建模奠定了基础。

关键词: 模型简化, 过程系统, 计算机模拟, 数字孪生, 简捷精馏塔模型