基于模拟退火算法的变压精馏经济优化

发布时间：2018-04-23 12:20

本文选题：变压精馏 + 模拟退火算法　；参考：《青岛科技大学》2017年硕士论文

【摘要】：变压精馏的经济优化对其节省设备投资与降低能耗具有决定性意义。本文提出了基于序贯迭代软件优化方法和基于模拟退火算法的优化方法,以丙酮-甲醇和甲醇-氯仿共沸体系的变压精馏工艺为例对所提出的优化方法进行研究与讨论。利用化工流程模拟集成技术,通过Visual Basic调用Aspen Plus自动化服务器,以年度总费用(TAC)为目标函数,结合传统序贯迭代法理论基础,开发出基于序贯迭代法变压精馏优化软件并形成相应的优化方法。分析讨论模拟退火算法的状态产生规则与冷却进度表的选择准则,将模拟退火算法与流程模拟集成技术结合起来,实现基于流程模拟与模拟退火算法的软件开发并提出相应的优化方法。将所提出的两种优化方法分别应用到丙酮-甲醇、甲醇-氯仿共沸体系无热集成及热集成变压精馏的经济优化。研究表明,所提出的两种优化方法皆能获得比传统优化方法更优的TAC值。压力优化的变压精馏经济优化结果表明:丙酮-甲醇无热集成与部分热集成变压精馏最优TAC分别减少了17.32%,15.52%。甲醇-氯仿无热集成与完全热集成变压精馏最优TAC分别减少了9.04%,4.05%。与压力设定的优化结果相比,压力优化的经济优化过程能显著降低目标函数TAC值。因此,两塔的操作压力优化对于变压精馏及其热集成工艺的经济优化具有极其重要的意义。热集成变压精馏工艺的再优化研究表明:对于最优工艺塔板数较多的丙酮-甲醇共沸体系,其热集成工艺再优化后TAC明显降低;对于最优工艺塔板数较少的甲醇-氯仿共沸体系,其热集成工艺再优化后TAC降低较少。本文所提出的基于序贯迭代软件优化法和基于模拟退火算法的优化方法具有易获得较优TAC值、计算耗时较少、自动或半自动运行等优势,可用于其它二元共沸物系变压精馏的经济优化与工业设计。
[Abstract]:The economic optimization of variable-pressure distillation plays a decisive role in saving equipment investment and reducing energy consumption. In this paper, the optimization method based on sequential iterative software optimization and simulated annealing algorithm is proposed. The study and discussion of the proposed optimization method are carried out by taking the pressure swing distillation process of acetone-methanol and methanol-chloroform azeotropic system as an example. Using chemical process simulation integration technology, calling Aspen Plus automation server through Visual Basic, taking total annual cost as objective function, combining with the theory foundation of traditional sequential iteration method. The optimization software of variable-pressure distillation based on sequential iterative method was developed and the corresponding optimization method was developed. The state generation rules of simulated annealing algorithm and the selection criteria of cooling schedule are analyzed and discussed. The integration technology of simulated annealing algorithm and process simulation is combined. The software development based on process simulation and simulated annealing algorithm is realized and the corresponding optimization method is proposed. The two optimization methods were applied to the economic optimization of acetone-methanol, methanol-chloroform azeotrope system without heat integration and thermal integrated pressure swing distillation. The results show that both of the proposed optimization methods can obtain better TAC than the traditional optimization methods. The results of economic optimization of pressure optimization show that the optimal TAC of acetone-methanol thermo-free distillation and partial thermal integrated distillation is 17.32% 15.52% respectively. The optimal TAC of methanol chloroform thermostatic integration and complete thermal integration variable pressure distillation decreased by 9.04 and 4.05, respectively. Compared with the optimization results of pressure setting, the economic optimization process of pressure optimization can significantly reduce the TAC value of the objective function. Therefore, the operation pressure optimization of the two towers is of great significance for the economic optimization of the variable pressure distillation and its thermal integration process. The study of reoptimization of thermal integrated pressure swing distillation process shows that the TAC of acetone-methanol azeotropic system with more plates is obviously reduced after the optimization of thermal integration process. For the methanol-chloroform azeotropic system with less plate number, the TAC decreased less after the optimization of the thermal integration process. The optimization method based on sequential iterative software optimization and simulated annealing algorithm has the advantages of easy to obtain optimal TAC value, less computation time, automatic or semi-automatic operation, etc. It can be used for economic optimization and industrial design of other binary azeotropic distillation systems.
【学位授予单位】：青岛科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP301.6;TQ028.31

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