Synthesis of Dynamically Stable Chemical Processes

CIRIC-9408694传统工艺综合涉及优化化工过程的稳态经济性能。在确定了流程图结构、设备尺寸和额定运行参数后，进行稳定性分析和控制系统设计。这项工作的目标是将可控性问题纳入到工艺设计中。其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。该测试是一种基于非局部优化的动态稳定性测试，它询问动态系统是否将始终保持在控制邻域内。该测试方法灵活，可应用于参数不确定系统、约束动态系统或离散动态模式系统。这项工作将把这种基于优化的稳定性测试嵌入到一个寻求经济设计的更大的优化问题中。PI计划用双温度模拟退火法解决由此产生的双层优化问题。将研究四个具体问题：换热网络综合、热集成精馏系统、热集成反应器网络和均相共沸精馏。

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.