基于随机优化的热耦合复杂精馏系统的综合(Ⅰ) 模型化方法  

Synthesis of thermally coupled complex distillation system based on stochastic optimization (Ⅰ) Problem formulation

作　　者：安维中[1] 袁希钢[1] 

机构地区：[1]化学工程联合国家重点实验室(天津大学)

出　　处：《化工学报》2006年第7期1591-1598,共8页CIESC Journal

基　　金：国家重点基础研究发展规划项目(G2000026308).~~

摘　　要：基于随机型最优化策略,针对包含简单塔、带有侧线蒸出及侧线汽提塔的复杂塔、全热耦合(或Petlyuk)塔的热耦合复杂精馏塔系统的综合问题,提出一种模型化方法.针对热耦合复杂精馏流程系统所需塔段数目以及冷凝器和再沸器数目的不确定性,提出了一种分解求解策略,将原问题分解成一系列具有不同塔段数的子问题分别求解;针对流程结构的优化提出一种流程结构的编码表达法,该方法将问题的分离序列结构和热耦合方式分别用两组编码表示,对分离序列的编码采用了数据结构理论中的二叉树排序方法,使流程结构的描述变得更加简便;最后以预分馏塔组分回收率及回流比为连续变量,建立了热耦合复杂精馏系统优化的混合整数非线性规划(MINLP)模型,该模型用改进的模拟退火算法求解,可同时得到优化的流程结构和操作参数.Based on stochastic optimization strategy, a formulation methodology was proposed for optimal synthesis of thermally coupled complex distillation column systems comprising simple columns, complex columns with side rectifier and/or side stripper as well as partially or fully thermally coupled （Petlyuk） columns with prefractionators. To cope with the uncertainty of the number of column sections and thermally coupled streams for a given multi-component mixture separation problem, a decomposition strategy was proposed so that the original problem could be divided into a series of subproblems with different numbers of column sections. To represent and manipulate the flowsheet structure in the optimization, a coding procedure was developed. The procedure was implemented by tearing the representation into two strings of code： separation sequence and thermal-coupling scheme. The fiowsheet structure encoding was performed by adopting a binary sort tree approach that is originally used in data structure theory, so that the problem formulation and solution becomes tractable. Finally, taking the recoveries of key components in the pretractionators and reflux ratios as continuous variables, mixed-integer nonlinear programming （MINLP） problem was formulated. The solution to could be achieved with an improved simulated annealing algorithm. a conceptual the problem

关 键 词：复杂精馏流程综合 热耦合 模拟退火 混合整数非线性规划 二叉树排序 

分 类 号：TQ021.8[化学工程]