• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1992년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 19-21 Oct. 1992
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• pp.1109-1114
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• 1992

Modern chemical processes are becoming more complicated. The sophisticated chemical processes have needed the fault diagnosis pxpert systems that can detect and diagnose the fault diagnosis expert systems that can detect and diagnose the faults of some processes and give and advice to the operator in the event of process faults. We present the Time-Delay Neural Network(TDNN) approach for on-line fautl diagnosis. The on-line fault diagnosis system finds the exact origin of the fault of which the symptom is propagated continuously with time. The proposed method has been applied to a pilot distillation column to show the merits and applicability of the TDNN.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1986년도 한국자동제어학술회의논문집; 한국과학기술대학, 충남; 17-18 Oct. 1986
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• pp.238-243
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• 1986

Distillation columns are widely used in almost every chemical plant. The use of multivariable control for such units is attractive because of the strong interactions exhibited between outputs and inputs and the desire to control simultaneously both top and bottom products. In this research design of a robust multivariable controller for distillation column was considered; output feedback controller with proportional and integral modes was designed using pole assignment. The transfer function matrix was obtained by fitting the step response realtions between single input double output pairs of variables. This matrix was then converted to linear time invariant state space model by multivariable realization technique. With the proposed multivariable proportional and integral controller applied to the process, the result of the digital computer simulation showed a good performance of asymtotic tracking. The limited experimental performance of this multivariable control was compared with the result from simulation. It was found that the proposed controller performed satisfactorily for the distillation column which separated binary mixture of methanol and water.

• 제어로봇시스템학회논문지
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• 제9권3호
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• pp.236-241
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• 2003

This paper addresses the optimal design of dividing wall distillation column which is rapidly applied in a variety of chemical processes over recent several years because of its high energy saving efficiency. A general dividing wall column model which can cope with the heat transfer through the dividing wall is developed using rigorous computer simulation. Based on the simulation model, the effects of the internal recycle flow distribution around the dividing wall and the heat transfer across the dividing wall on overall system performance are investigated. An improved column design method is suggested to utilize the heat transfer through the wall. The suggested method is compared with the existing method via simulation study in which the proposed design shows improved energy saving result.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1990년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 26-27 Oct. 1990
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• pp.225-228
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• 1990

The major difficulty in distillation column control lies in executing the set point tracking and the disturbance rejection, because of continuous changes in model order and dead time. For that, generalized predictive control(GPC) was applied to distillation column control. Recursive least square method was used to adjust the changes of model order and dead time. Quadratic progamming(QP) was used to solve the constraint problems in control action and the rate of control action. As a result of the simulation on the dynamic simulator(SPEEDUP) and the experiment on pilot plant, the ability of the set point tracking and the disturbance rejection was acceptable to apply to the real distillation column.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1990년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 26-27 Oct. 1990
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• pp.229-233
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• 1990

A new on-line optimization technique of a distillation column is presented. The equation decoupling method and the simultaneous solution method are combined to simulate the distillation process. The storage requirement is small enough to run on a PC. A improved successive quadratic programming is used to find the optimum operating conditions. The optimizer is intensively tested by using the dynamic simulator, SPEEDUP. After this, the technique is applied to a binary distillation column that treats methanol and water.

• 제어로봇시스템학회논문지
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• 제7권3호
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• pp.263-268
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• 2001

A new control scheme s proposed for the control of reactive batch distillation (RBD) column. A nonlinear wave model captures the essential dynamic behavior of the RBD process. The proposed control scheme is based on both Generic Model Control(GNC) and nonlinear wave model. The control scheme uses a profile position of the column as a controlled variable. Ethanol esterification process using RBD is chosen as an example process. Tight control of the distillate purity is obtained with the use of the proposed control scheme.

• 제어로봇시스템학회논문지
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• 제12권9호
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• pp.945-953
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• 2006

Though a fully thermally coupled distillation column consumes less energy than an original column, it is not widely implemented in practice due to its operational difficulty. A new fully thermally coupled distillation column is proposed for the operability improvement, and its performance is investigated. The main improvement is the separation of a main column to give an upper and lower columns and the installation of an intermediate heat exchanger between them to regulate the fluctuation of product compositions. A proper manipulation of column pressure in the separated main columns made easy vapor flow without a compressor. The operability improvement is examined in a hexane process from the dynamic simulation using a commercial design software HYSYS. The simulation results indicate that the coupling among inputs and outputs is loosened to make easy manipulation of product compositions in the proposed distillation system.

• 제어로봇시스템학회논문지
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• 제12권12호
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• pp.1209-1214
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• 2006

This paper presents an application of Dividing Wall Column(DWC) to the recovery of the waste solvent from the film making processes. The waste solvent feed contains MEK(Methyl-Ethyl-Ketone), Toluene, Cyclohexanone, and water. The commercial software $HYSYS^{TM}$ was used for rigorous simulation and analysis. Sensitivity analysis for several major design variables were carried out to achieve the optimal design of the process. Distribution of the internal vapor and liquid flows to the prefractionator and main sections is shown to be the most dominant design factor for energy saving efficiency in the DWC process. The simulation results also show that the solvent recovery process using the DWC significantly improves both the energy efficiency and the compactness of the solvent recovery process.

• 에너지공학
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• 제2권1호
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• pp.123-132
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• 1993

알콜 발효액으로부터 순수 에탄올을 분리하기 위하여 이용되는 증류공정에 대한 에너지 절약형 모델이 여러 가지 제시되고 있다. 본 연구에서는 이들 중 개발가능성이 가장 높은 가압-감압 증류공정의 설계를 위한 컴퓨터 프로그램을 개발하고 이를 이용하여 증류탑의 최적 운전 조건을 규명하였을 뿐만 아니라 가압-감압 증류공정 및 상압증류 공정에 대한 고정 비용 및 분리 에너지 비용을 비교, 분석하였다. 본 연구에서 고려한 운전 압력은 상압 증류 공정인 경우 760 mmHg, 가압-감압 증류 공정인 경우 3103-760 mmHg, 31034-450mmHg, 및 3130-160 mmHg이였다. 각 운전압력에서 년간 고정비용과 년간 에너지 소비 비용의 합이 최소가 되는 최적 환류비는 운전압력이 상압일때는 3.8554, 가압-감압이 3130-760 mmHg일 때는 3.7475, 2.9111, 가압-감압이 3130-450 mmHg일 때는 3.8814, 2.9712, 가압-감압이 3103-160 mmHg일 때는 3.0783과 2.2400 이였다. 또한 가압-감압 증류공정에 소요되는 에너지 비용은 상압증류공정에 대하여 가압-감압 운전압력이 3103-760 mmHg인 경우에는 45.4%. 운전압력이 3130-450 mmHg인 경우에는 46.9%, 운전압력이 3103-160 mmHg인 경우에는 42%에 불과하였다.

• Korean Chemical Engineering Research
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• 제52권6호
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• pp.713-719
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• 2014

4성분계 다중반응이 반응증류 탑 내에서 발생할 때 증류거동의 변화를 시각화 방법을 통해 분석하였다. 시각화 방법이란 단순 증류의 물질수지에 각 반응에 의한 벡터를 추가하고 이를 공간상에 표현하는 것으로 각 단에서 혼합물의 조성 변화 및 반응의 진척도를 직관적으로 알 수 있다. 또한 이를 통해 주어진 운전조건에서 필요한 총 단수 및 최적반응 단의 위치를 결정할 수 있다. 본 연구에서는 에틸렌글리콜(Ethylene glycol) 생산공정을 시각화 방법을 통해 분석하였다. 제안된 시각화 방법을 사용하여 복잡한 실험이나 공정모사 없이 4성분계 다중반응증류 공정에 대한 타당성 평가 및 분석이 가능하다.