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Application of a divided wall column for gas separation in floating liquefied natural gas plant
전호환,김영한 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.7
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 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.
전호환,Lee Cheol-Min,이인원,최정은 대한조선학회 2021 International Journal of Naval Architecture and Oc Vol.13 No.1
This paper applies load variation method to predict speed-power-rpm relationship along with propulsive performances in regular head waves, and to derive overload factors (ITTC, 2018). ‘Calm-water tests’ and ‘resistance test in waves’ are used. The modified overload factors are proposed taking non-linearity into consideration, and applied to the direct powering, and resistance and thrust identity method. These indirect methods are evaluated through comparing the speed-power-rpm relationships with those obtained from the resistance and self-propulsion tests in calm water and in waves. The objective ship is KVLCC2. The load variation method predicts well the speed-power-rpm relationship and propulsion performances in waves. The direct powering method with modified overload factors also predicts well. The resistance and thrust identity method with modified overload factor predicts with a little difference. The direct powering method with overload factors predicts with a relatively larger difference.
전호환,조완근 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.3
Polymer-supported TiO2 nanofibers with different polyvinylpyrrolidone (PVP)-to-TiO2 (PT) ratios weresynthesized and their photocatalytic efficiencies were examined for the decomposition of trichloroeth-ylene (TCE). The spectral results of the TiO2 nanofibers confirmed the presence of TiO2 crystal phases inthe nanofibers. The TiO2 nanofiber with the highest PT ratio of 1:1.3 showed the highest TCEdecomposition (94%), followed by TiO2 nanofibers with PT ratios of 1:0.7 (91%), 1:0.35 (88%), and 1:0.1(84%). The conditions of low input concentration and humidity were suggested for the optimaldecomposition of TCE. Consequently, the TiO2 nanofiber webs could be used effectively to decomposeTCE.