【作者】 张春霞；

【导师】 徐艳； 朱春雨；

【作者基本信息】 天津大学 ， 化学工程（专业学位）， 2015， 硕士

【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。更多还原

【Abstract】 The research on the systematic synthesis of distillation configurations has attracted great attentions for a long time. A complete search space consisting of distillation configurations is necessary for configurations constructing according to a given separation subject with energy-saving as the goal. The matrix method, as a promosing approach for multicomponent distillation sequences developed recently, has an obvious advantage in generating a complete search space of regular-column and subcolumn configurations with algrism.In order to facilitate the selection of the configurations with the requirements of separation, a code matrix-based method was proposed based on the marked matrix method. Since the search mode in the encoding of the initial code matrices and the criterions for excluding infeasible configurations were associated with the characteristics of regular-column and subcolum configurations, the code matrix-based method has wider application. And the more systematic and concise principles for the combination of initial code and configuration screening make distiallation sequences synthesis easier to be achieved with algorism.Furthermore, the principles for grouping the components in feed and classifying the configurations were summarized for further selecting the schemes with separation requirements.The code matrix-based method is then applied to Etylene Glycol purification. Based on the parameter sensitivity analysis, the effects of design and operation varibles, such as therotical plates number, position of feed stage, side withdrawing rate and reflux ratio, on the reboiler heat dudy were determined to abtain the design specifications of an optimal three-column distillation sequence. The scheme with the lowest total reboiler heat duty was identified from the sixteen candidate schemes by Aspen Plus optimization. It was found that the scheme with ethylene glycol as a pure product uses less energy due to the energy consumption is needed for further purification of ethylene glycol in the scheme with ethylene glycol produced as a mixture.更多还原