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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received March 15, 2013
Accepted April 25, 2013

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Application of a divided wall column for gas separation in floating liquefied natural gas plant

Ho Hwan Chun Young Han Kim^1†

Department of Naval Architecture & Ocean Engineering, Pusan National University, Busan 609-735, Korea ¹Department of Chemical Engineering, Dong-A University, Busan 604-714, Korea

Korean Journal of Chemical Engineering, July 2013, 30(7), 1473-1479(7), 10.1007/s11814-013-0067-y

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Abstract

A divided wall column (DWC) has widely been utilized as an energy-efficient distillation column. When it is applied to the offshore floating liquefied natural gas (FLNG) plant, its compactness can provide a favorable distillation system for the unconventional plant on top of its high energy efficiency. We investigated the design characteristic, cost evaluation and operation difficulty of the DWC at its utilization in the FLNG plant. The results from the HYSYS simulation of the DWC were compared with those of the conventional distillation system, and the following was found from_x000D_ the study. The DWC replacing the depropanizer and debutanizer of the conventional distillation system requires 12.5% less investment cost. While the saving of 25% in steam cost is expected from the DWC, the total utility cost including the refrigerant cost is reduced by 20.2% due to the lower cost reduction of refrigeration in the DWC.

Keywords

Divided Wall Column Energy-efficient Distillation Floating Liquefied Natural Gas Plant Thermally-coupled Distillation

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