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여영구 한국시뮬레이션학회 1994 한국시뮬레이션학회 논문지 Vol.3 No.1
For the identification of the optimal operating conditions of phosphoric acid plant, an intelligent simulation was performed based on the dissolution reaction of phosphate rock. A phosphoric acid plant consists of three main processes : ball-mill grinding process, rock reaction process and slurry filteration process. The grinding and filteration processes are relatively simple processes and most of the simulation works are on the reaction process. The practical operation data of phosphoric acid plant at Namhae Chemical Corp. were utilized in the simulation. The operation of the phosphoric acid plant is highly dependent on the heuristics of operators and so the expert system technology was employed. The operation of phosphoric acid plant varies with the origin of phosphate rock. Results of the simulation showed the optimal values of major process variables and optimal operating conditions. The knowledgebase for the expert system was constructed based on the interview with the experienced plant operators.
Analysis of the Wet-end Dynamics in Paper Mills
여영구,이성철,DongJunSeo,HongKang,JaeYongRyu 한국펄프.종이工學會 2003 펄프.종이기술 Vol.35 No.5
For the purpose of manufacturing water-resistant corrugated board boxes for agricultural products in the cold chain system, the effects of fiber types, wet strength agents and a moisture-proof chemical on the properties of the base papers were investigated first. PAE(polyamide amine epichlorohydrin) showed better performance than MF(melamine formalde-hyde) over broad stock pH ranges, which was prefered as wet strength agent for the paper grade. When short fibers(AOCC, KOCC) were mixed with long fiber(UKP) in certain ratios, some physical properties of the paper made with mixed fibers were similar to those of the paper made with UKP only. Paper containing AOCC showed the biggest increase in water resistance when PAE was added to the stock. Synergistic effects in moisture-proof and some mechanical properties of paper were appeared when PAR was added internally, together with the coating of a moisture proof chemical on the sheets.
Modeling and Simulation of Wet-end White Water System in the Paper Mill
여영구,이성철,Jae Yong Ryu,Hong Kang 한국화학공학회 2004 Korean Journal of Chemical Engineering Vol.21 No.2
A dynamic model representing the wet-end of a paper mill is developed to characterize its dynamic behavior. The model is based on the mass balance relationships written for the simplified wet-end white water network. The dynamic response of the wet-end is influenced both by the white water volume and by the level of wire retention. Effects of key manipulated variables such as the thick stock flow rate, the ash flow rate and the retention aid rate on the major controlled variables are analyzed by numerical simulations. It can be said that the consistency of the model with plant data seems to be reasonably good and can be used as a tool for plant analysis and control.
여영구,윤인섭,송형근,노균 한국화학공학회 1991 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.29 No.3
이산시간대 다변수 쌍일차공정에 대해 적분기능을 지닌 새로운 모델인 쌍일차 CARIMA모델을 제안하고 이를 이용한 일반형 예측제어를 유도하였다. 모델을 이용한 다스� 최적예측자를 유도하고 이동구간 비용함수를 선정하여 이를 최소화시키는 제어입력을 계산하는 엄밀해법과 근사해법을 제시하였다. 수치모사를 통하여 제안된 제어방법이 공정에 대한 제한된 사전지식만이 반영된 모델을 이용한 경우에도 견실한 제어성능을 발휘함을 확인하였다. A generalized predictive controller for discrete-time MIMO bilinear processes is derived based on a new bilinear CARIMA model with integral action. Using this model a multi-step ahead optimal predicaor is derived. Two alternative solution methods-rigorous and short-cut-of the minimization problem of a longrange cost-function are introduced and used to calculate control input. Several simulation results show that the proposed control methods have robustness to the limited prior knowledge of the process.