基于代码矩阵的精馏序列合成及其应用研究

发布时间：2018-07-20 12:41

【摘要】：多元体系的精馏分离序列合成一直以来备受关注。构建完备的精馏序列搜索空间,是筛选出满足分离要求且具有能耗优势的精馏序列的重要前提。矩阵法是近年来发展起来的一种以0-1上三角矩阵表示精馏配置的合成方法,该方法具有提供完整的精馏配置搜索空间、便于算法实现的特点。在矩阵法的基础上,开展与其相关的应用研究具有重要的应用价值和一定的理论意义。本文在基于标号矩阵的减塔配置合成的研究基础上,提出了基于代码矩阵的精馏序列合成法。该方法由于提出了针对常规配置的初始代码生成方法和分别针对常规及减塔的不可行配置的剔除原则,适用于常规配置和减塔配置的合成。该方法对初始代码矩阵合并原则进行了补充与完善,较为简洁、系统化的代码合并原则和不可行配置的剔除原则更便于算法实现。在方法应用方面,提出了多元体系组群的划分原则,将分离序列的分类方法及算法与针对具体分离要求的流股分割要求及产品采出位置要求相结合,使基于代码矩阵生成的精馏序列搜索范围进一步减小。将精馏序列合成方法和筛选方法用于煤制乙二醇精制过程,根据乙二醇分离体系特点,采取了两种组群划分方式,在设定精馏塔个数和侧采流股数、流股分割情况以及产品流股采出位置的条件下,进行了分离方案的筛选,共计获得了8个三塔流程及对应的16个备选方案。通过Aspen Plus模拟软件,对备选方案进行灵敏度分析模块,确定理论板数、进料位置、侧采速率和回流比等对再沸器热负荷以及产品纯度的影响。进而通过优化模块,对各方案优化,获得了总再沸器热负荷最小的分离方案。结果表明:将乙二醇单独作为一个组群时三塔分离能耗更低。
[Abstract]:The synthesis of distillation separation sequence has always attracted much attention. The construction of a complete distillation sequence search space is an important prerequisite for screening the distillation sequence that meets the requirements of separation and has the advantage of energy consumption. The matrix method is a synthetic method which has been developed in recent years by the 0-1 triangular matrix rectifying configuration. A complete distillation configuration search space is provided to facilitate the realization of the algorithm. On the basis of the matrix method, it is of great application value and theoretical significance to carry out its related application research. On the basis of the research on the configuration of the reduced tower configuration based on the label matrix, the distillation sequence synthesis method based on the code matrix is proposed. The method is suitable for the synthesis of the conventional configuration and the reduction of the tower configuration. This method is suitable for the synthesis of the conventional configuration and the reduction of the tower configuration. This method is complementary and perfect to the principle of the initial code matrix merging. The elimination principle of row configuration is more convenient for algorithm implementation. In the application of the method, the partition principle of multicomponent system group is proposed. The classification method and algorithm of the separation sequence are combined with the requirements of the flow share segmentation and the production position requirements for the specific separation requirements, so that the search range of the distillation sequence generated based on the code matrix is further extended. The distillation sequence synthesis method and the screening method are used for the refining process of ethylene glycol. According to the characteristics of the ethylene glycol separation system, two groups of groups are divided. The separation scheme is selected under the conditions of setting the number of the distillation column and the number of side mining flow, the split situation of the flow share and the position of the product flow. Through the Aspen Plus simulation software, the sensitivity analysis module is carried out through the Aspen Plus simulation software to determine the influence of the theoretical plate number, the feeding position, the side recovery rate and the reflux ratio on the reboiler heat load and the product purity. Then the optimization module is used to optimize the reboiler heat and obtain the heat of the reboiler. The results showed that when ethylene glycol was used as a group, the energy consumption of three towers separation was lower.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ028

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