摘要
通过对换热网络的定性分析提出了换热网络优化改进的 4条规则 :①控制变量应对调节变量反应灵敏 ;②选择的调节变量数应小于或等于控制变量数 ;③一组控制变量应有一组调节变量相匹配 ;④如果在标准操作条件下现有换热网络是最佳的 ,而且改进过程中对它做最小的改变就使换热网络适合当前的或多周期操作条件 ,那么该改进费用一定是最小的 ,因此这种改进就是最佳的 .根据上述规则 ,结合换热网络的灵敏度分析建立了换热网络优化改进及控制的数学模型和求解方法 ,给出了换热网络优化改进的步骤 ,通过实例计算及应用证明本文所提方法正确、可靠、有效 ,可在解决实际工程问题中使用 .
Four rules of retrofit of heat exchanger networks (HENs) are proposed through qualitative analysis of HENs: (1) The controlled variables (CVs) are sensitive to the manipulated variables (MVs); (2) The number of the selected MVs should be less than or equal to the number of the CVs; (3) A set of the controlled variables possess a set of the manipulated variables, and the changes in the CVs induced by the changes of disturbance variables (DVs) can be adjusted and their increments are equal to zero at the end by the adjustment of the selected MVs; (4) If the existing HEN is optimal in normal operating condition, and the minimum change of the existing HEN during retrofit makes the HEN suitable for present or multi-period operating conditions, then the retrofit cost may be the minimum, so the retrofitted HEN may be optimal. The mathematical models and solving method of retrofit and control of HENs are established based on the rules and sensitivity analysis of HENs. The procedure of the retrofit of HENs is given. It is established by the calculation of the examples and practical use that the method is correct and available.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2003年第7期965-971,共7页
CIESC Journal
基金
吉林省科委青年基金资助项目
关键词
换热网络
控制
柔性
改进
定性分析
Heat transfer
Mathematical models
Optimization
Retrofitting
Thermal variables control
