Synthesis of Dynamically Stable Chemical Processes

摘要- Ciric - 9408694 传统的过程综合涉及优化化学过程的稳态经济性能。 稳定性分析和控制系统设计是在流程图结构、设备尺寸和标称操作参数确定后进行的。 这项工作的目的是将可控性问题纳入工艺设计。 这个想法是使用基于优化的测试来筛选出不稳定或难以控制的工艺设计。 该测试是基于非局部优化的动态稳定性测试，询问动态系统是否始终保持在控制邻域内。 该测试是灵活的，可以应用到系统的参数不确定性，约束动态系统，或系统的离散动态模式。 这项工作将嵌入一个更大的优化问题，寻求一个经济的设计，这种基于优化的稳定性测试。 PI计划使用双温度模拟退火方法解决由此产生的双层优化问题。 四个具体问题将被调查：热交换器网络综合，热集成蒸馏系统，热集成反应器网络，和均相共沸蒸馏。

Abstract - Ciric - 9408694 Traditional process synthesis involves optimizing the steady state economic performance of a chemical process. Stability analysis and control system design are performed after the flowsheet structure, equipment sizes, and nominal operating parameters have been specified. The objective of this work is to incorporate controllability issues into process design. The idea is to use an optimization based test to screen out process designs that are unstable or difficult to control. The test is a non-local optimization-based test of dynamic stability that asks whether a dynamic system will always remain within the control neighborhood. The test is flexible and can be applied to systems with parameter uncertainty, to constrained dynamic systems, or to systems with discrete dynamic modes. The work will embed this optimization-based test for stability within a larger optimization problem that seeks an economical design. The PI plans to solve the resulting bi-level optimization problem with a dual-temperature simulated annealing approach. Four specific problems will be investigated: heat exchanger network synthesis, heat integrated distillation systems, heat integrated reactor networks, and homogeneous azeotropic distillation.