强化Petlyuk分壁精馏塔分离四元混合醇的动态控制
发布时间：2019-01-21 17:53
【摘要】：强化Petlyuk分壁精馏塔(PDWC)可在一个塔内实现四元混合物的高纯度分离。以分离甲醇(Methanol)、乙醇(Ethanol)、正丙醇(1-Propanol)和正丁醇(1-Butanol)为对象,在优化的PDWC的严格稳态精馏模型的基础上,采用2种不同的浓度控制结构对PDWC的动态控制效果进行了研究。结果表明,2种控制结构均能对进料组分±20%的波动进行有效的控制。采用塔釜热负荷控制上、下侧线中杂质和塔釜杂质的总和的方法,可使乙醇产品纯度更接近设定值,再沸器负荷略有增加。通过最小蒸汽量V-min图分析控制过程中产品纯度偏差的原因,即当进料组成发生变化导致V-min增加时,乙醇产品纯度会略低于设定值;相反,当进料组成发生变化导致V-min减小时,乙醇产品纯度会略高于设定值。这一现象表明,进料组成波动所导致V-min变化与乙醇产品纯度的变化呈负相关性。
[Abstract]:Enhanced Petlyuk fractionation column (PDWC) can achieve high purity separation of quaternary mixtures in a single column. The separation of methanol (Methanol), ethanol (Ethanol), n-propanol (1-Propanol) and n-butanol (1-Butanol) was studied on the basis of an optimized model of PDWC's strict steady-state distillation. The dynamic control effect of PDWC was studied by using two different concentration control structures. The results show that the fluctuation of feed component 卤20% can be effectively controlled by the two control structures. By adopting the summation of impurity and impurity in the lower side line of the tower, the purity of ethanol product is closer to the set value, and the load of reboiler is slightly increased. The reason of the product purity deviation in the control process was analyzed by V-min diagram of the minimum steam quantity, that is, when the feed composition changed and the V-min increased, the purity of the ethanol product would be slightly lower than the set value. On the contrary, when the feed composition changes and the V-min decreases, the purity of ethanol product is slightly higher than the set value. This phenomenon indicates that the change of V-min caused by the fluctuation of feed composition is negatively correlated with the change of ethanol purity.
【作者单位】： 中国石化抚顺石油化工研究院;华东理工大学化学工程联合国家重点实验室;
【基金】：国家自然科学基金项目(21476081) 上海市教育委员会科研创新重点项目(14ZZ058) 教育部基本科研业务费青年探索基金项目(WA1514306)资助
【分类号】：TQ028.3;TQ223.1
，
本文编号：2412884
[Abstract]:Enhanced Petlyuk fractionation column (PDWC) can achieve high purity separation of quaternary mixtures in a single column. The separation of methanol (Methanol), ethanol (Ethanol), n-propanol (1-Propanol) and n-butanol (1-Butanol) was studied on the basis of an optimized model of PDWC's strict steady-state distillation. The dynamic control effect of PDWC was studied by using two different concentration control structures. The results show that the fluctuation of feed component 卤20% can be effectively controlled by the two control structures. By adopting the summation of impurity and impurity in the lower side line of the tower, the purity of ethanol product is closer to the set value, and the load of reboiler is slightly increased. The reason of the product purity deviation in the control process was analyzed by V-min diagram of the minimum steam quantity, that is, when the feed composition changed and the V-min increased, the purity of the ethanol product would be slightly lower than the set value. On the contrary, when the feed composition changes and the V-min decreases, the purity of ethanol product is slightly higher than the set value. This phenomenon indicates that the change of V-min caused by the fluctuation of feed composition is negatively correlated with the change of ethanol purity.
【作者单位】： 中国石化抚顺石油化工研究院;华东理工大学化学工程联合国家重点实验室;
【基金】：国家自然科学基金项目(21476081) 上海市教育委员会科研创新重点项目(14ZZ058) 教育部基本科研业务费青年探索基金项目(WA1514306)资助
【分类号】：TQ028.3;TQ223.1
，
本文编号：2412884
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