| 초록 |
A divided wall column (DWC), a compact ternary separator, is a good candidate for the distillation process in the offshore operation. In this study the DWC is applied to the offshore floating liquefied natural gas (FLNG) plant, but high utility cost is incurred in the application because of the large difference of boiling points among the feed components. A diabatic DWC is proposed here, and its design procedure is presented along with the performance and economic evaluation and the examination of thermodynamic efficiency as well. Though 7 % more investment is required in the DWC compared with the conventional system, 16 % less utility cost is used. The exergy loss is reduced by 12 %, and the thermal efficiency is improved by 3.3 percentage point over the conventional system. |
