Design and control of pressure-swing distillation(PSD) with different heat integration modes for the separation of methyl acetate/methanol azeotrope are explored using Aspen Plus and Aspen Dynamics. First, an optimum ...Design and control of pressure-swing distillation(PSD) with different heat integration modes for the separation of methyl acetate/methanol azeotrope are explored using Aspen Plus and Aspen Dynamics. First, an optimum steady-state separation configuration conditions are obtained via taking the total annual cost(TAC) or total reboiler heat duty as the objective functions. The results show that about 27.68% and 25.40% saving in TAC can be achieved by the PSD with full and partial heat integration compared to PSD without heat integration. Second,temperature control tray locations are obtained according to the sensitivity criterion and singular value decomposition(SVD) analysis and the single-end control structure is effective based on the feed composition sensitivity analysis. Finally, the comparison of dynamic controllability is made among various control structures for PSD with partial and full heat integration. It is shown that both control structures of composition/temperature cascade and pressure-compensated temperature have a good dynamic response performance for PSD with heat integration facing feed flowrate and composition disturbances. However, PSD with full heat integration performs the poor controllability despite of a little bit of economy.展开更多
变压精馏工艺虽然是生产高浓度甲缩醛的主要方法,但该工艺存在能耗高的缺点。本文基于变压精馏分离甲缩醛和甲醇共沸物的工艺方法,利用Aspen plus软件对10万t/a高浓度甲缩醛生产过程进行模拟,基于模拟数据和Aspen Energy analyzer软件...变压精馏工艺虽然是生产高浓度甲缩醛的主要方法,但该工艺存在能耗高的缺点。本文基于变压精馏分离甲缩醛和甲醇共沸物的工艺方法,利用Aspen plus软件对10万t/a高浓度甲缩醛生产过程进行模拟,基于模拟数据和Aspen Energy analyzer软件对该过程换热网络进行分析和优化。结果表明:在最小传热温差为10℃时,常规变压精馏工艺夹点温度为84.03℃(热物流)和74.03℃(冷物流),充分利用甲缩醛加压精馏塔塔顶物流潜热及塔底物流显热的换热网络节能效果显著,优化后的换热网络可节省热公用工程3.732 MW、冷公用工程3.701 MW,热节能率为33.68%。展开更多
文摘Design and control of pressure-swing distillation(PSD) with different heat integration modes for the separation of methyl acetate/methanol azeotrope are explored using Aspen Plus and Aspen Dynamics. First, an optimum steady-state separation configuration conditions are obtained via taking the total annual cost(TAC) or total reboiler heat duty as the objective functions. The results show that about 27.68% and 25.40% saving in TAC can be achieved by the PSD with full and partial heat integration compared to PSD without heat integration. Second,temperature control tray locations are obtained according to the sensitivity criterion and singular value decomposition(SVD) analysis and the single-end control structure is effective based on the feed composition sensitivity analysis. Finally, the comparison of dynamic controllability is made among various control structures for PSD with partial and full heat integration. It is shown that both control structures of composition/temperature cascade and pressure-compensated temperature have a good dynamic response performance for PSD with heat integration facing feed flowrate and composition disturbances. However, PSD with full heat integration performs the poor controllability despite of a little bit of economy.