:: ICCAS 2015 ::

WB01		[OS] Experimental Studies for Nonlinear Chemical Process Controls
Time : 13:30~15:00 Room : 101		Chair : Jietae Lee (Kyungpook National University, )



13:30~13:45	WB01-1

n-Propanol Aqueous Solution Shows Nonlinearity in Liquid Level depending on Water Proportion
YoungSu Park, Yugyeong Lim, Jietae Lee(Kyungpook National University, Korea, Republic of )

n-propanol ( boiling point : 97℃) and water ( boiling point : 100℃) mixtures cannot distilled by simple distillation. Mixture has a minimum-boiling azeotrope ( 87.7℃, 71.7wt% ). n-Propanol aqueous solution is fed to a tank temperature remained constant at 90℃. A volume of vaporized solution in tank can be changed by a water proportion of feed flow. A volume of vaporized solution can be measured by liquid level. Liquid level of solution shows nonlinearity.



13:45~14:00	WB01-2

Efficient control research in CO PROX reaction
JeaPil Heo, Jietae Lee(kyung pook national university, Korea, Republic of )

Recently, Fuel cell has attracted attention because of the wide range of applications. But, The supply of hydrogen still has a lot of problems. How supplied hydrogen is mainly used the reforming. It used gas containing CO. It gas causes poisoning of the catalyst fuel cell. Therefore, CO PROX is a necessary reaction to the fuel cell. We need to control for this reaction



14:00~14:15	WB01-3

The Control of pH Neutralization Process in the Large Scale Reactor
Yugyeong Lim, YoungSu Park, Jietae Lee(Kyungpook National University, Korea, Republic of )

The control of pH neutralization process is known to be difficult to control due to its high nonlinearity that is represented with titration curve and time-varying characteristics. These problems cause many difficulties in controlling the pH process with the PID controller. So, there are many modeling and control researches of pH process in perfect mixing. In industry, those are not proper because mixing time should be considered in the large scale reactor. In this study, we simulate pH process in perfect mixing and in not well mixing and compare two simulation.



14:15~14:30	WB01-4

Optimization of hysteresis on the liquid level system and hysteresis process implemented with siphon in the liquid level system
inhyun kyoung, Jietae Lee(Kyungpook National University, Korea, Republic of )

Hysteresis on the liquid level system(HOLLY)-based water tank liquid level systems show popular in testing multivariable control systems for multivariable processes with positive or negative zeros. When showing the relationship between the quantity of state and the variables of state in the substance obtained by test bed, it can be seen to draw a loop phenomenon which the quantity of state is not consistent at the time of increasing and decreasing after the variable of state was increased or decreased cyclically in a predetermined range. This phenomenon is called hysteresis.



14:30~14:45	WB01-5

Reduced order observer design for nonlinear system: Case of Continuous stirred-tank reactor
Sanghun Ahn, Jungwon Kim, Addis Lulu, Dongil Shin(Myongji University, Korea, Republic of )

The main focus of this paper is design of reduced order observer in nonlinear system. Rigorous mathematical model is needed to handle nonstationary process and many accidents occur in these conditions more than steady state operating conditions and reactor is important part of chemical process from its dynamic changes of properties such as temperature, concentration and pressure. Furthermore, its dynamics is nonlinear. So, this problem cannot be solved with SPC and linear system modeling so that we tried to solve it with nonlinear state observer.



14:45~15:00	WB01-6

Theoretical Formula for the Evaluation of Adsorbents in Pressure Swing Adsorption
Seongbin Ga(Korean Advanced Institute of Science and Technology, Korea, Republic of ), Hong Jang, Jay H Lee(KAIST, Korea, Republic of )

We present a shortcut formula to calculate the theoretical efficiency of adsorbents in a PSA system. The shortcut formula calculates the amount of captured CO2 based on an instantaneous isotherm approximation per consumed energy based on an ideal gas compressor This study also suggests a method to calculate the pressure range satisfying a given target purity.