热集成复杂精馏系统综合的研究

Research on heat integrated complex distillation system synthesis

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。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。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地降低系统的总费用,还表明该方法是求解热集成复杂精馏系统综合问题的有效方法。

By using the pinch analysis method in the heat exchanger 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 pre-fractionators and reflux ratios and the discrete variables of separation sequence and thermal-coupling scheme was established. The solution of the problem could be achieved with an improved simulated annealing algorithm. Three example problems of five-component mixtures separation were solved and the optimized parameters and economic benefits of different optimal schemes were analyzed and compared. The results demonstrated that the system annual total cost could be reduced by using the heat integrated complex distillation configuration. The solutions of example problems also demonstrated that the proposed method was efficient for the heat integrated complex distillation synthesis problem.