基于弹性分析的空分变负荷操作优化  

Optimization of air separation variable-loading based on flexibility analysis

作　　者：姚润杰 高静雨 章渊昶[1] 孙健 祝铃钰[1] YAO Run-jie;GAO Jing-yu;ZHANG Yuan-chang;SUN Jian;ZHU Ling-yu(College of Chemical Engineering,Zhejiang University of Technology,Hangzhou 310014,China;Hangzhou Oxygen Plant Group Co.Ltd.,Hangzhou 310014,China)

机构地区：[1]浙江工业大学化学工程学院,浙江杭州310014 [2]杭州制氧机集团股份有限公司,浙江杭州310014

出　　处：《高校化学工程学报》2022年第2期218-225,共8页Journal of Chemical Engineering of Chinese Universities

基　　金：浙江省自然科学基金重点项目(LZ21B060001);国家重点研发计划(2017YFB0603703)。

摘　　要：针对空分装置变负荷过程的优化控制问题,提出用弹性分析对不同控制精度下的操作变量进行优化的方法。建立等价超结构换热网络模型用以描述多股流换热器,进而建立可用于操作分析的空分装置机理模型以准确描述空分变负荷过程。引入弹性指数表示关键操作变量的控制范围和精度,用柱形代数分解方法求解关键操作变量弹性边界的显式表达式,将复杂多变量非线性过程模型转换为多项式显式模型。提出基于弹性分析的优化命题,在此基础上进行空分装置操作优化。以空分氮气液化流程为例,建立流程模型并求解优化命题,计算结果证明该策略的有效性。A flexibility analysis method was proposed to optimize operation variables under different control precision for the optimal control of variable-loading process of air separation unit.The Stage-Wise superstructure heat transfer network model was established to describe the multi-flow heat exchanger,and then the mechanism model of air separation unit for operation analysis was developed to accurately describe the variable load process of air separation.The flexibility index was introduced to represent the control range and precision of key operational variables,and the explicit expression of the flexibility boundary of the key operating variables was solved by the cylindrical algebraic decomposition(CAD)method,and the complex multivariable nonlinear process model was transformed into a polynomial explicit model.An air separation nitrogen liquefaction process analyzed as an example,and the optimization proposition was solved.The calculation results showed the effectiveness of the strategy.

关 键 词：空分 变负荷 多股流换热器 分级超结构换热网络 弹性 柱形代数分解 

分 类 号：TQ116.11[化学工程—无机化工]