A new unified model to simulate columns with multiple phase divisions and their impact on energy savings
A new unified model to simulate columns with multiple phase divisions and their impact on energy savings
复制标题
DOI：
10.1016/j.compchemeng.2020.106937
复制
发表时间：
2020-09
期刊：
影响因子：
--
通讯作者：
L. C. Biasi;M. Heinkenschloss;F. R. Batista;R. Zemp;A. L. Romano;Antonio J. A. Meirelles
中科院分区：
文献类型：
--
作者：
L. C. Biasi;M. Heinkenschloss;F. R. Batista;R. Zemp;A. L. Romano;Antonio J. A. Meirelles
本文提出了一种新的统一模型，该模型允许对具有任意整数分相的精馏塔进行模拟。这样的柱子具有节省大量能源和资本成本的潜力。然而，传统的模拟器不涵盖与相位划分的列和以前的模拟需要一个定制的算法为每种类型的列。所提出的模型使用一套独特的网格方程来计算寄生物、转生和常规蒸馏。通过对阶段分度的微小修改，该模型可以模拟常规、顶部和底部dwcs。通过引入两个新变量：液体（θ）和蒸汽（β）相分的数量，这种推广成为可能。通过对寄生柱和转寄生柱的分析，证明了增加相分裂数对生物乙醇蒸馏的积极影响。与传统色谱柱相比，这些色谱柱的运营成本和年总成本分别降低了19%和15%。
This paper presents a new unified model that allows the simulation of distillation columns with any integer number of phase divisions. Such columns have the potential for substantial savings in energy and capital costs. However, conventional simulators do not cover columns with phase divisions and previous simulations required a tailored algorithm for each type of column. The proposed model uses a unique set of MESH-equations for parastillation, metastillation, and conventional distillation. With small modifications in the stage indexing, the model allows the simulation of conventional, top and bottom-DWCs. This generalization was possible by introducing two new variables: the number of liquid (θ) and vapor (β) phase divisions. The positive impact of increasing the number of phase divisions was demonstrated in the bioethanol distillation, by analyzing parastillation and metastillation columns. These columns reduce the operational and total annual costs in 19% and 15%, when compared to conventional columns.