典型石化工艺装置换热网络模型的全局优化策略  

Global Optimization Strategies of Heat Exchanger Network Models for Typical Petrochemical Process Units

作　　者：雷杨[1] 范宝安[1] 曾丹林[1] 王光辉[1] 

机构地区：[1]武汉科技大学化学工程与技术学院,湖北武汉430081

出　　处：《高校化学工程学报》2016年第3期686-692,共7页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(21473126);高等学校博士学科点专项科研基金(20124219110002);中国博士后科学基金(2015M582285)

摘　　要：在石化节能的工程实践中,由于冷物流分流限制,石化工艺装置中存在一类单一冷物流被多条热物流加热的问题。针对这类典型的石化工艺过程换热流程优化模型存在陷入局部最优解或无解的困境,提出利用凸化非凸项技术,将非线性规划问题转化为凸规划问题。通过逐段线性化的方法松弛原有可行区间,并依据上下界差异确定分段数值,最终得到目标函数的全局最优解。以延迟焦化装置的换热网络为例,计算结果显示采用全局优化策略计算的结果更优,减少约3.4×10~6 CNY×a^(-1)。One of the petrochemical energy saving problems is that a single cold stream can be heated by several hot streams because of the limitation of cold stream splitting. This problem usually results in partial or no solution. Therefore, a method was proposed in this study to convert concave functions into convex functions. The problem was solved by converting each section into a linear problem, and the section boundary was determined in term of the difference between upper and lower boundaries to obtain a global optimal solution. Heat exchanger networks of a delayed coking unit were used for case study and the result shows that the global optimal solution can provide better results by reducing cost of 3.4×10^6 CNY×a^-1.

关 键 词：换热网络 石化过程 全局优化 混合整数非线性模型 

分 类 号：TQ028.8[化学工程]