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Optimal design and effective control of Kaibel column with liquid-only transfer streams for quaternary distillation

机译：高液蒸馏液体传输流的高效设计与有效控制

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摘要

The Kaibel column (KC) is considered to be energy effective and capital economical replacement of conventional distillation sequences for quaternary distillation. However, the industrialization of such a structure is still hesitant due to increased complexity and related uncertainties. Compared to the highly integrated KC, distillation configurations with liquid-only transfer streams (LTS) are more easily understandable and acceptable to the industrial community. A KC-LTS configuration is therefore investigated through an optimal design and controllability comparison to the conventional direct sequence (DS). When separation of aromatics is proposed as a case study, the results demonstrate the economic superiority of KC-LTS to DS in terms of the total annual cost. Considering the controllability using composition controllers, the former structure performs as favorable as the latter when tackling a +/- 20% step changes in throughput and feed composition. An inferential temperature control strategy is also established for KC-LTS. Good controllability is generally realized in most cases at handling relatively small (10%) throughput and feed composition disturbances, except for large product offsets when resisting large (20%) feed perturbations. To further improve its dynamic control effectiveness, an intensified control option with three composition control loops is successfully proposed to handle 20% step feed disturbances. Overall, this work expands LTS to quaternary distillation, suggesting a competitive substitute of the well-known KC for both academic and industrial purposes.
机译：Kaibel柱（KC）被认为是能量有效和资本经济替代季蒸馏的常规蒸馏序列。然而，由于增加了复杂性和相关的不确定性，这种结构的产业化仍然犹豫不决。与高度集成的KC相比，具有液体传输流（LTS）的蒸馏配置更容易理解和工业界可接受。因此，通过与传统直接序列（DS）的最佳设计和可控性比较来研究KC-LTS配置。当提出芳烃的分离作为案例研究时，结果表明KC-LTS对DS的经济优势在年度成本方面。考虑到使用组成控制器的可控性，前者在处理+/- 20％的吞吐量和饲料组合物中的步骤变化时，前者的结构表现为后者。还为KC-LT建立了推理温度控制策略。除了在抵抗大（20％）饲料扰动时，大多数情况下，通常在大多数情况下实现良好的可控性。为了进一步提高其动态控制效率，成功提出了具有三种组合对照环路的强化控制选项，以处理20％的步骤进纸干扰。总体而言，这项工作扩大了季度蒸馏，表明学术和工业目的的知名KC竞争替代品。

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