热集成复杂精馏系统综合的研究.pdfVIP

主题十：其它相关论文 热集成复杂精馏系统综合的研究 丰莲，袁希钢，罗 青 （天津大学化学工程联合国家重点实验室，天津大学化学工程研究所，天津300072） 摘 要：将夹点分析法应用于热集成复杂精馏系统综合的换热网络设计中，避免了以换热网络结构作为独 立变量，建立了一个以预分馏塔组分回收率，回流比及操作压力为连续变量，以分离序列和热耦合方式为 离散变量的混合整数非线性规划（MINLP）模型。 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。对多个五组分混合物分离问题进行了求解，并对不同优化方案的优化结果及其经济性 作了比较和分析，结果表明采用热集成复杂精馏塔流程可以显著的降低系统的总费用。算例还表明本文方 法是求解热集成复杂精馏系统综合问题的有效方法。 关键词：夹点分析法；复杂精馏系统综合；热集成； MINLP On Heat Integration in the Complex Distillation System Synthesis Dong Feng-lian，Yuan Xi-gang ， Luo Yi-qing （State key laboratory of Chemical Engineering (Tianjin University), Chemical Engineering Research Center, Tianjin University. Tianjin 300072, China ） Abstract: Through applying the pinch analysis method in the heat exchanger s design of heat integrated complex distillation system synthesis, a mixed-integrated nonlinear programming(MINLP) model with the continuous variables of the recoveries of key components in the prefractionators and reflux ratios and the discrete variables of separation sequence and thermal-coupling scheme was established. The solution to the problem could be achieved with an improved simulated annealing algorithm. Three example problems for five-component mixtures separation were solved and the optimized parameters and economic benefits of different optimal schemes were analyzed and compared. The results demonstrate that it can evidently reduce the system s annual total cost by using the heat integrated complex distillation configuration. The solutions of example problems also demonstrate that the proposed method is efficient for the heat integrated complex distillation synthesis problem. Key words: pinch analysis method ；complex distillation system synthesis; heat integration; MINLP 0 引言 574