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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Korean Chemical Engineering Research
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Journal DOI :
The Korean Institute of Chemical Engineers
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Volume & Issues
Volume 45, Issue 6 - Dec 2007
Volume 45, Issue 5 - Oct 2007
Volume 45, Issue 4 - Aug 2007
Volume 45, Issue 3 - Jun 2007
Volume 45, Issue 2 - Apr 2007
Volume 45, Issue 1 - Feb 2007
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Simulation of a Six-zone Simulated Moving Bed Chromatographic Process for NPK Fertilizer Production
Lim, Young-Il ; Lee, A-Ran ;
Korean Chemical Engineering Research, volume 45, issue 1, 2007, Pages 1~11
strong cation exchange simulated moving bed (SMB) chromatography, a nitrogen-phosphate-potas-produced in a cost-effective manner. The SMB process operated in a non-traditional way isdivided into production and regeneration sections for exclusion of undesirable ions, and composed of six zones includ-ing two wash-water zones. This paper addreses modeling and simulation studies on the ion-exchange SMB proces, compar-ing simulation results with experimental data obtained both from a pilot plant and an industrial plant. The simulation resultsshow a good agrement with in situ experimental data obtained in the two plants. The model equation validated by the exper-iments will be applicable for optimization problems to obtain optimum operating conditions of the process.
Temperature Control in Autothermal Reforming Reactor
Kim, Song-Joo ; Nam, Ji-Hoon ; Lee, Jie-Tae ; Kim, Dong-Hyun ;
Korean Chemical Engineering Research, volume 45, issue 1, 2007, Pages 12~16
control of an autothermal methanol reforming reactor which uses the copper-zinc oxide cat-alyst was studied. Temperature at 1cm below the hot-spot point in the reactor was used for the controlled variable, andthe air flow rate was used for the manipulated variable. A first order plus time delay model was identified and controlerparameters were obtained by applying the IMC-PI tuning rule to the identified model. With this controler, we couldcontrol the reforming reactor temperature within ± 5oC over 100 hours. Change of the hot-spot point due to the catalystdegradation was investigated and it could be used to design an adaptive controller.
Modeling and Simulation of Drying Cylinders in Paper Processes
Lee, Eun-Ho ; Kwak, Ki-Young ; Yeo, Yeong-Koo ;
Korean Chemical Engineering Research, volume 45, issue 1, 2007, Pages 17~24
purpose of the present study is to identify the drying cylinder model in paper plants and to analyzecharacteristics of process responses for changes in input variables. The model developed in this work is based on actualplant operation data where the steam pressure applied to the cylinder behaves as the major variable. It is found that heattransfer coefficients from the condensate to the canvas could be represented as empirical relations based on heat con-ductivities and operation data. The effectiveness of the cylinder model is demonstrated by the measured moisture con-tents and web temperature. Stability of the drying process is analyzed based on the transfer functions derived from thecylinder model.
Optimal Hydrogen Recycling Network Design of Petrochemical Complex
Jeong, Chang-Hyun ; Lee, Chul-Jin ; Kim, Dae-Hyeon ; Han, Chong-Hun ;
Korean Chemical Engineering Research, volume 45, issue 1, 2007, Pages 25~31
petrochemical complex, large amount of hydrogen is produced as a by-product and used as a fuel inpetrochemical and oil refinery plants. By recycling this byproduct hydrogen as a raw material, the value of hydrogen canbe greatly improved. This paper proposes a design methodology for optimal hydrogen recycle network between plants inpetrochemical complex by analyzing the hydrogen pinch, required cost and constraints.
Fault Detection & SPC of Batch Process using Multi-way Regression Method
Woo, Kyoung-Sup ; Lee, Chang-Jun ; Han, Kyoung-Hoon ; Ko, Jae-Wook ; Yoon, En-Sup ;
Korean Chemical Engineering Research, volume 45, issue 1, 2007, Pages 32~38
The Study of Structure Design for Dividing Wall Distillation Column
Lee, Seung-Hyun ; Lee, Moon-Yong ;
Korean Chemical Engineering Research, volume 45, issue 1, 2007, Pages 39~45
paper proposed a shortcut method for the structure design of dividing wall column based on the Fen-ske-Underwood equation by applying it on thre conventional simple column configuration. It is shown that the pro-posed shortcut method can design the column structure including the feed tray, dividing wall section, and side-streamtray in a simple and efficient way in the initial design stage. Simulation study using HYSYS to compare the energy sav-ing performance betwen the conventional sequential two column system and the dividing wal column designed by theproposed method shows that the proposed dividing wal column system saves from 16. to 65. more over the con-depends on the composition of intermediate component while the optimal energy consumption patern to internal flowdistribution on the dividing wal section is characterized by the ESI factor of the feed mixture.
A Study on the Computer Simulation for the Complete Combustion Reaction of PCBs in Supercritical Water
Cho, Jung-Ho ; Kim, Kyeong-Sook ; Son, Soon-Hwan ; Kim, Yeong-Cheol ;
Korean Chemical Engineering Research, volume 45, issue 1, 2007, Pages 46~51
In this study, computer simulations have been performed for the removal of the transformer oil contaminated with polychlorinated biphenyls (PCBs) in supercritical water through complete combustion reaction. We regarded n-decane as a main material of transformer oil, and it is assumed to be 3.0 wt％ of transformer oil in supercritical water. We used Peng-Robinson equation of state to estimate the physical properties of components in supercritical water. Throughout the computer simulation done in this work, we could explain the solubilities of 3.0 wt% of transformer oil and excess oxygen in supercritical water.
Design of TAME Process using a Commercial Design Software
Hwang, Kyu-Suk ; Lee, Moon-Yong ; Kim, Young-Han ;
Korean Chemical Engineering Research, volume 45, issue 1, 2007, Pages 52~56
Though a reactive distillation column reduces energy requirement and gives easy separation of azeotropic mixture to result in wide practical applications in field, its design is difficult. On the other hand, a commercial design software used largely in chemical process design and performance evaluation can solve the problem, but the addition of reaction into the tray is not simple. In this study the addition is implemented to make the process simulation available, and it is utilized in the design of a TAME process to find the following design guidelines. The addition of reactive trays gives more composition elevation than the composition decrease from the reduction of the trays, and the increase of nonreactive trays does not improve product quality. The elevation of reboiler heat duty lowers the product quality by the reduction of residence time in reactive tray and conversion.
A Comparison Study between Batch and Continuous Process Simulation for the Separation of Carbon-13 Isotope by Cryogenic Distillation
Kim, Jong-Hwan ; Lee, Doug-Hyung ; Lee, Euy-Soo ; Park, Sang-Jin ;
Korean Chemical Engineering Research, volume 45, issue 1, 2007, Pages 57~66
gases generally consist of mainly12C and about 1.1. of 13C. It is wel known that a stable carbonisotope, 13C, has been widely used for the applications of medical, pharmaceutical, and agricultural tracers. As a result,the development of the separation and concentrating technology of 13C can cause of high value-added products and thepossibility of the generation of ral, there are two kinds of approaches to obtain a stable 13Cisotope by the separation of cryogenic distillation. One is to obtain a concentrated 13CH4 isotope from natural gas.Another approach is to get concentrated 13CO by distillation followed by a chemical reaction of CH4 and H2O. In thisstudy, rigorous process simulations of the cryogenic distillation have been performed and analyzed for the concentratedseparation of 13C isotopes from LNG and NG by using comercial process simulator. Due to the very smal diferencesof relative volatilities and separabilities of 12C and 13centration of 13C need special strategies and feasibility studies. Utilization of vapor pressure data to acentric factor inSRK equation of state and optimized process conditions have been able to predict for the effective of the separation yieldand concentration of 13C for the cryogenic distillation. The various operation strategies for both batch and continuouscryogenic distillation are also studied and sugested for the basic design of the process. Development of this study canprovide a tool for the efective design and operation of the cryogenic separation of 13C.
Identification of MIMO State Space Model based on MISO High-order ARX Model: Design and Application
Won, Wang-Yun ; Yoon, Ji-Eun ; Lee, Kwang-Soon ; Lee, Bong-Kook ;
Korean Chemical Engineering Research, volume 45, issue 1, 2007, Pages 67~72
efficient method for identification of MIMO state space model has been developed by combining partial least squares (PLS) regression, balanced realization, and balanced truncation. In the developed method, a MIMO system is decomposed into multiple MISO systems each of which is represented by a high-order ARX model and the parameters of the ARX models are estimated by PLS. Then, MISO state space models for respective MISO ARX transfer function are found through realization and combined to a MIMO state space model. Finally, a minimal balanced MIMO state space model is obtained through balanced realization and truncation. The proposed method was applied to the design of model predictive control for temperature control of a high pressure CO2 solubility measurement system.
Optimal Trajectory Finding and re-optimization of SBR for Nitrogen Removal
Kim, Young-Whang ; Yoo, Chang-Kyoo ; Lee, In-Beum ;
Korean Chemical Engineering Research, volume 45, issue 1, 2007, Pages 73~80
This article aims to optimize the nitrogen removal of a sequencing batch reactor (SBR) through the use of the activated sludge model and iterative dynamic programming (IDP). Using a minimum batch time and a maximum nitrogen removal for minimum energy consumption, a performance index is developed on the basis of minimum area criteria for SBR optimization. Choosing area as the performance index makes the optimization problem simpler and a proper weighting in the performance index makes it possible to solve minimum time and energy problem of SBR simultaneously. The optimized results show that the optimal set-point of dissolved oxygen affects both the total batch time and total energy cost. For two different influent loadings, IDP-based SBR optimizations suggest each supervisory control of batch scheduling and set-point trajectory of dissolved oxygen (DO) concentration, and can save 20% of the total energy cost, while meeting the treatment requirements of COD and nitrogen. Moreover, it shows that the re-optimization of IDP within a batch can solve the modelling error problem due to the influent loading changes, or the process faults.
The Computer Simulation and Estimation of Membrane Mass Transfer Coefficients of Hollow Fiber Membrane G-L Contactors for
Kim, Yong-Kuk ; Song, Hee-Ouel ; Lee, Hyung-Keun ; Kim, In-Won ;
Korean Chemical Engineering Research, volume 45, issue 1, 2007, Pages 81~86
Hollow fiber membrane G-L contactors are widely used to remove SO2 emitted from industrial facilities. In this work, the mathematical modeling and computer simulation for hollow membrane G-L contactors is carried out to analyze SO2 absorption behavior in hollow fiber membranes. The model is solved with the finite element method using a commercial software. Investigated is the dependency of SO2 removal efficiency and mass transfer characteristics on gas velocities, membrane mass transfer coefficients and physical properties of contactors. The membrane mass transfer coefficients are estimated by fitting the experimental data with the simulated SO2 removal efficiencies. In addition, a design methodology of membrane contactors is suggested.
Missing Value Estimation and Sensor Fault Identification using Multivariate Statistical Analysis
Lee, Chang-Kyu ; Lee, In-Beum ;
Korean Chemical Engineering Research, volume 45, issue 1, 2007, Pages 87~92
Recently, developments of process monitoring system in order to detect and diagnose process abnormali-ties has got the spotlight in process systems engineering. Normal data obtained from processes provide available infor-mation of process characteristics to be used for modeling, monitoring, and control. Since modern chemical andenvironmental processes have high dimensionality, strong correlation, severe dynamics and nonlinearity, it is not easy toanalyze a process through model-based approach. To overcome limitations of model-based approach, lots of systemengineers and academic researchers have focused on statistical approach combined with multivariable analysis such asprincipal component analysis (PCA), partial least squares (PLS), and so on. Several multivariate analysis methods havebeen modified to apply it to a chemical process with specific characteristics such as dynamics, nonlinearity, and so on.This paper discusses about missing value estimation and sensor fault identification based on process variable reconstruc-tion using dynamic PCA and canonical variate analysis.
Development of 3D DMFC Model for Flow Field Design
Kim, Hong-Seong ; Danilov, Valeri A. ; Lim, Jong-Koo ; Moon, Il ;
Korean Chemical Engineering Research, volume 45, issue 1, 2007, Pages 93~102
objective of this study is to develop a 3D DMFC model for modeling gas evolution and flow patterns to design optimal flow field for gas management. The gas management on the anode side is an important issue in DMFC design and it greatly influences the performance of the fuel cell. The flow field is tightly related to gas management and distribution. Since experiment for the optimal design of various flow fields is difficult and expensive due to high bipolar plate cost, computational fluid dynamics (CFD) is implemented to solve the problem. A two-fluid model was developed for CFD based flow field design. The CFD analysis is used to visualize and to analyze the flow pattern and to reduce the number of experiments. Case studies of typical flow field designs such as serpentine, zigzag, parallel and semi-serpentine type illustrate applications of the model. This study presents simulation results of velocity, pressure, methanol mole fraction and gas content distribution. The suggested model is verified to be useful for the optimal flow field design.
A Study on Hazard Identification Method for Small and Medium Chemical Industries
Lee, Jae-Min ; Yoo, Jin-Hwan ; Ko, Jae-Wook ;
Korean Chemical Engineering Research, volume 45, issue 1, 2007, Pages 103~108
for hazard identification and risk assessment by using brainstorming method. So, HAZOP analysis has been applied tomajor chemical industries efficiently. But it does not apply to small and midium chemical industries because of theinsufficiency of the experts. Hence, in this study a new hazard identification method is proposed by modifying com-plexity and expertise of the HAZOP analysis and will be contributed to improve risk management for small and midiumchemical industries