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이해평,류경옥 ( Hae Pyeong Lee,Kyong Ok Yoo ) 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.3
본 연구는 최적 열교환망 합성에 관한 연구로서 핀치 설계 방법을 기본으로 하였으며, 실제적인 열교환망 합성 이전 단계에서 최소 접근 온도차의 최적화를 수행함으로써 최적의 목표값을 설정하였다. 목표값 설정 단계에서는 제약 조건이 주어지거나 여러 개의 핀치점들을 갖는 계인 것으로 판단될 경우, 계의 분리법을 적용하여 보다 타당성있는 결과 값을 얻을 수 있었으며, 다중 유틸리티의 사용을 고려하여 에너지 비용의 절감 효과를 기대할 수 있었다. 실제적인 흐름들간의 합성 방법으로서는 경험 법칙들을 이용하였으며, 이 이론들을 근거로 하는 프로그램을 개발하여 몇 가지 예제들에 적용한 결과 값들을 제시하였다. This article for the synthesis of optimal heat exchanger network has been based on the pinch design method. The optimal targets were determined by the optimization of the minimum temperature difference before the actual synthesis steps. The system separation method was proposed to determine the reliable target for the system with multiple pinches or constraints. To save energy cost, we used multiple utilities. The program developed on the basis of several heuristics was applied to examples and we examined the validity of the results.
이해평,류경옥 ( Hae Pyeong Lee,Kyong Ok Yoo ) 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.3
This article for the synthesis of optimal heat exchanger network has been based on the pinch design method. The optimal targets were determined by the optimization of the minimum temperature difference before the actual synthesis steps. The system separation method was proposed to determine the reliable target for the system with multiple pinches or constraints. To save energy cost, we used multiple utilities. The program developed on the basis of several heuristics was applied to examples and we examined the validity of the results.
이해평,류경옥 ( Hae Pyeong Lee,Kyong Ok Yoo ) 한국화학공학회 1994 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.32 No.3
The optimal minimum temperature difference and the optimal total cost targets based on the energy and capital cost were determined before the synthesis of the heat exchanger network. The present method using the system separation, was applied to the system which have the discontinuity on the temperature-enthalpy diagram, the multiple pinches and the match constraints for the intangibles of design such as safety, layout and etc. The program based on the above method was developed and it was possible simply to find the optimal target for the actual heat exchanger network by the pinch design rule.
Dry Sorbent Injection 에 의한 배가스 처리 : Calcium 계와 금속산화물 흡착제를 이용한 HF 제거
이충무(Choong Moo Lee),오세천(Sea Cheon Oh),이해평(Hae Pyeong Lee),김희택(Hee Taik Kim),류경옥(Kyong Ok Yoo) 한국화학공학회 1999 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.37 No.3
In order to reduce HF in a flue gas via DSI process, the HF removal efficiency of calcium-based sorbent was investigated. By using gas chromatography the effluent gas exited from fixed-bed reactor was analyzed at temperature range of 250-950 ℃. Also BET, XRD, SEM/EDX, DLS and TG/DTA were carried out to certify the reaction mechanism. HF removal efficiency was maximum at 750 ℃ and decreased above this temperature because of specific surface area reduction resulted from structural changes of sorbent. Reactivity of sorbent was proportional to initial concentration of HF and flow rate of 150 ㎖/min showed the highest removal capacity. In addition, HF removal efficiency of various metal oxide sorbents such as Al₂O₃, Cu₂O, Fe₂O₃, MgO, TiO₂and ZnO was studied. As a result, Fe₂O₃ showed an excellent removal capacity in this study.
수송 및 준비 시간을 고려한 다제품 회분식 공정의 최적 생산 방안을 위한 혼합 정수 선형 모델
변승헌(Seung Heon Byun),이해평(Hae Pyeong Lee),김경숙(Kyong Sook Kim),류경옥(Kyong Ok Yoo) 한국화학공학회 1997 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.35 No.6
Previous MINLP models in the multiproduct batch scheduling problems with nonzero transfer and setup times have defects in obtaining a local optimal solution. Therefore, a newly formulated MILP models using binary variable Y_(lij) were presented. In case of large size problems, approximate MILP method which can improve the efficiency of previous heuristics was proposed. After obtaining an initial solution by previous heuristics, a solution group which was supposed to obtain good results was investigated using the proposed MILP model.
공업화학 촉매 / 반응공학 : Dynamic Model 을 이용한 PVC 열분해의 속도론적 연구
오세천(Sea Cheon Oh),이해평(Hae Pyeong Lee),김희택(Hee Taik Kim),류경옥(Kyong Ok Yoo) 한국화학공학회 1999 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.37 No.5
The kinetic analysis of the thermal degradation of poly(vinyl chloride)(PVC) has been studied by a conventional thermogravimetric technique using dynamic model method. The thermal degradation was found to be a complex process composed of at least two steps for which kinetic values can be calculated. The kinetic analysis of PVC gave apparent activation energy of 159.7 kJ/㏖ for the first step with a value of 189.6 kJ/㏖for the second step. To verify the effectiveness of the kinetic analysis method proposed in this work, the results based on dynamic model method were compared to those of analytical methods reported in the literature.
단신 / 황화된 다공성 아연계 흡착제의 산화적 재생반응에 관한 연구
오세천(Oh Sea Cheon),이해평(Lee Hae Pyeong),김희택(Kim Hee Taik),이재복(Lee Jae Bok),류경옥(Yoo Kyong Ok) 한국화학공학회 2000 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.38 No.1
In order to develop sorbents for the removal of hydrogen sulfide contained in coal-derived gas, additives such as CaO, Li₂O and TiO₂, were added to zinc oxide and the reactivity and kinetics of the oxidative regeneration for the sulfided porous zinc-based sorbents were examined. At 600-700℃ the initial reaction rate of these sorbents increased with increasing the reaction temperature and the effect of total gas flow rate on the reaction above 100 ㎖/min showed similar behavior. Also it was revealed that only the 2.0 at% TiO₂-doped ZnO sorbent promoted oxidation rate of pure zinc sulfide from the investigation of the effect of additives on regeneration. In this study Avrami equation was appropriate to interpret the kinetic data obtained from oxidation. The oxidation rate constant was expressed as k=2.07×10^(12) exp(-27170/T) and the activation energy of oxidation was 54.06 kJ/㏖.