精馏过程多工况优化设计的能量流结构理论

OPTIMIZATION OF DISTILLATION PROCESS UNDER MULTIPLE PERIOD OPERATION BASED ONENERGY FLOW STRUCTURE THEORY

以“三环节”能量流结构理论为基础建立了精馏过程多工况优化设计的经济数学模型 ,提出了精馏过程的多工况优化设计策略方法 :将其分解为单个塔的多工况优化设计和塔间热集成的优化两个层次 ,有效输出价cU 和待回收价cO 为协调变量来解决多工况优化设计问题 .并给出了应用实例 .

Based on the three-link energy flow structure theory, an optimization strategy for the distillation process under multiple period operation is presented. The highlights of the strategy are as follows: the problem solution is divided into two levels of single column and column system, and transformed exergy price cU and to-be-recovered exergy price cO are used as the coordination variables. Exergoeconomic models for the optimization of the whole distillation process (including single column and heat integration between columns) are established. The strategy and the model are applied successfully to the optimal design for the column system of a gas separation unit in a refinery under 3 period operation. The optimal scheme proposed is 29.4% less in energy consumption and 21.9% lower in the total cost compared to the exist traditional design.