Evolutionary algorithm is applied for distillation separation sequence optimization synthesis problems with combination explosion. The binary tree data structure is used to describe the distillation separation sequenc...Evolutionary algorithm is applied for distillation separation sequence optimization synthesis problems with combination explosion. The binary tree data structure is used to describe the distillation separation sequence, and it is directly applied as the coding method. Genetic operators, which ensure to prohibit illegal filial generations completely, are designed by using the method of graph theory. The crossover operator based on a single parent or two parents is designed successfully. The example shows that the average ratio of search space from evolutionary algorithm with two-parent genetic operation is lower, whereas the rate of successful minimizations from evolutionary algorithm with single parent genetic operation is higher.展开更多
针对典型的LNG冷能空气分离工艺存在单位质量产品能耗较高、工艺流程可优化空间大等现状,介绍了一种LNG冷能用于空气分离流程的新模型。在对比传统空气分离工艺的缺点、详细分析典型的LNG冷能空气分离工艺流程优化可行性的基础上,提出...针对典型的LNG冷能空气分离工艺存在单位质量产品能耗较高、工艺流程可优化空间大等现状,介绍了一种LNG冷能用于空气分离流程的新模型。在对比传统空气分离工艺的缺点、详细分析典型的LNG冷能空气分离工艺流程优化可行性的基础上,提出了采用双级精馏塔空气分离的优化工艺流程:一级精馏塔预冷分离富氧液空,二级精馏塔分离液氮。使用Aspen Plus进行流程模拟,物性方程选用Pen—Robinson,并根据模拟数据计算分析产品能耗。计算结果表明:此优化工艺与传统空气分离工艺单位质量能耗1.05~1.25 k Wh相比,降低了50%以上。另外,利用黑箱模型研究了此流程中换热器的效率问题,计算得到η=12.6%,并分析了效率较低的原因,给出了该优化工艺应用建议。展开更多
文摘Evolutionary algorithm is applied for distillation separation sequence optimization synthesis problems with combination explosion. The binary tree data structure is used to describe the distillation separation sequence, and it is directly applied as the coding method. Genetic operators, which ensure to prohibit illegal filial generations completely, are designed by using the method of graph theory. The crossover operator based on a single parent or two parents is designed successfully. The example shows that the average ratio of search space from evolutionary algorithm with two-parent genetic operation is lower, whereas the rate of successful minimizations from evolutionary algorithm with single parent genetic operation is higher.
文摘针对典型的LNG冷能空气分离工艺存在单位质量产品能耗较高、工艺流程可优化空间大等现状,介绍了一种LNG冷能用于空气分离流程的新模型。在对比传统空气分离工艺的缺点、详细分析典型的LNG冷能空气分离工艺流程优化可行性的基础上,提出了采用双级精馏塔空气分离的优化工艺流程:一级精馏塔预冷分离富氧液空,二级精馏塔分离液氮。使用Aspen Plus进行流程模拟,物性方程选用Pen—Robinson,并根据模拟数据计算分析产品能耗。计算结果表明:此优化工艺与传统空气分离工艺单位质量能耗1.05~1.25 k Wh相比,降低了50%以上。另外,利用黑箱模型研究了此流程中换热器的效率问题,计算得到η=12.6%,并分析了效率较低的原因,给出了该优化工艺应用建议。
