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Design and control of energy-efficient distillation columns
김영한 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.9
Distillation is the best option for the separation of hydrocarbon mixtures, unless the boiling points of the constituents are close together. Despite being widely utilized in field applications, the high energy demand of distillation calls for efficient columns in order to save energy. The efficient divided wall column (DWC), diabatic distillation column, and internally heat-integrated distillation column (HIDiC) are introduced here, and the design and control of the columns are briefly reviewed. The practical applications of the columns in the processes of natural gas production from raw gas drawn from underground and benzene separation from naphtha reformate are presented to show the energy-saving performance of the energy-efficient distillation columns. The side-rectifier DWC reduced the heating duty of the conventional system by 5.9%, and provided a compact construction, replacing the three-column conventional system with a single column suitable for offshore application. Moreover, the controllability of DWC was improved by utilizing the side-rectifier. The benzene removal process utilizing the extended DWC lowered the heating duty of the whole conventional process by 56.8%.
Existing System Remodeling for a Fully Thermally Coupled Distillation Column
Moon Yong Lee,Young Han Kim 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
Though many divided wall columns are implemented in field as energy-efficient distillation columns, its application is limited due to the difficulty of building a new column. A novel energy-efficient distillation system utilizing the existing columns is proposed here. The proposed can reduce the energy consumption by about 39% comparing with the existing system. And it is shown that the proposed improves the column operability over the existing. The tray numbers of the added columns have no significant influence on the composition of a side draw.
Senug Hyun Lee,이문용,Mohammad Shamsuzzoha,한명완,김영한 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.2
An efficient design method is proposed for determining the optimal design structure of a dividing wall column (DWC). The internal section of the DWC is divided into four separate sections and matched to the sloppy arrangement with three conventional simple columns. The light and heavy key component mole-fractions are used as the design variables in each column. The structure that gives superior energy efficiency in the shortcut sloppy case also brings superior energy efficiency in the DWC, while the optimal internal flow distribution of the DWC is different from that obtained from the sloppy configuration. Based upon an extensive simulation study, a two-step approach is proposed for the DWC design: the optimal DWC structure is first determined by applying the shortcut method to the sloppy configuration; the optimal internal flow distribution is then found from the corresponding DWC configuration. The simulation study shows that the DWC designed by the proposed method gives a near-optimal structure.
Design and optimization of a dividing wall column by factorial design
구웬롱,이문용 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.5
A factorial design methodology was applied to the design of a dividing wall column, solving the complex multivariable problems and simultaneously optimizing the interacting variables to achieve the best design with respect to total annual cost. Column structure was practically optimized with a minimum of simulation runs. The proposed design method was tested in the design and optimization of an NGL recovery system; it allowed interactions between variables to be identified and quantified. The column system designed by the proposed method reduced reboiler energy consumption and total annual cost by 28.23% and 25.49%, respectively, in case 1, and those by 25.63% and 18.85%,respectively, over conventional distillation in case 2.
Moon Yong Lee,Dae Woong Choi,Young Han Kim 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.3
An approximate procedure for the estimation of operational variables in fully thermally coupled distillation columns (FTCDCs) using two pseudo-pinch points of the feed and side draw trays is proposed, and its performance is examined with two example processes. The estimates from the proposed procedure show some 20% error compared with the results of rigorous simulation using commercial design software, the HYSYS. In addition, the relation between vapor flow rate and composition at one stage above the feed tray-required in the estimation of operational variables of the FTCDC-is analyzed to give information for the selection of the feed tray composition. A preliminary evaluation of operational variables helps to screen unrealizable design obtained often from iterative trial procedures employing the mathematical programming.
Song, Daesung,Yoon, Yeong-Gak,Lee, Chul-Jin Elsevier 2017 Chemical engineering research & design Vol.123 No.-
<P><B>Abstract</B></P> <P>This paper proposes a process scheme for the recovery of 1,3-Butadiene (BD) and methyl ethyl ketone (MEK) from the dehydration products of 2,3-Butanediol (BDO). BDO is produced via the bio-fermentation of the industrial-gas wastes from the steel industry and various biomasses. The suggested process is environmentally beneficial because it can extend the feedstock rather than petroleum, and it replaces the use of the industrial-plant gas wastes. The proposed process is composed of a catalytic-dehydration reactor, a quencher, a BD-purification unit, a decanter, a water-removal column, and an MEK-purification unit. Based on the proposed scheme, the BD- and MEK-recovery rates are approximately 94% and 98%, respectively. Most of the units in the process are well developed, except for the azeotropic distillation column (ADC) that is used in the MEK-purification unit. A pilot test is also performed, and the results are compared with those of a simulation for an analysis of the viability of an ADC. Through the use of the experimental ADC, a mixture of MEK and 2-methylpropanal (2-MPA) is obtained via the removal of water. The results of the pilot test show that a water trace, MEK 84.5%, and 2-MPA 15.5% are separated to the bottom stream, which is in sound agreement with the simulation data. Furthermore, the simulated temperature profile is consistent with the experimental data with an error range of only ±2%.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We present a novel process for recovery of BD and MEK from BDO dehydration. </LI> <LI> Purities of BD and MEK are very high over 99%. </LI> <LI> Recovery rate of BD and MEK are estimated over 94% and 98%, respectively. </LI> <LI> Azeotropic distillation column which is tricky part is validated by pilot plant. </LI> <LI> It can contribute to use of BDO on commercial scale. </LI> </UL> </P>