http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
FDS에 의한 목재 및 지하철 화재의 열 및 연기 거동 시뮬레이션
손윤석(Yun Suk Sonh),단승규(Seung Kyu Dan),이봉우(Bong Woo Lee),권성필(Seong Pil Kwon),신동일(Dong Il Shin),김태옥(Tae Ok Kim) 한국가스학회 2010 한국가스학회지 Vol.14 No.6
본 연구에서는 CFD 기반의 화재시뮬레이터인 FDS에 의해 화재에서 열 및 연기 거동을 해석하는 방법을 제시하기 위하여 시뮬레이션 결과와 실험결과를 비교하였고, FDS 시뮬레이션의 그리드 크기변화에 대한 사고결과의 민감도 분석을 실시하였다. 목재 화재에서는 실험에서 얻은 열화상 이미지와 FDS 시뮬레이션을 비교한 결과, 최대온도에서도 약 4.3 %의 적은 오차를 나타내어 FDS에 의해 화재현상을 해석할 수 있었다. 또한 지하철 화재에서 그리드 크기변화에 대한 FDS 결과의 민감도를 분석한 결과, FDS 시뮬레이션의 그리드 크기를 28(L)×28(W)×14(H)보다 작게 하는 경우에는 연기 온도, CO 농도 및 가시거리의 시뮬레이션 결과가 거의 일정한 값을 나타내어 본 연구에서 설정한 화재 모델링으로 FDS에 의해 화재현상을 해석할 수 있음을 알 수 있었다. In this study, to propose the analysis method of heat and smoke behavior of fire using the CFD-based fire simulator FDS, comparison of the simulation results against the experimental results and the sensitivity of the results to the grid sizes have been investigated. For the wood fire, thermal images captured from the experiments were compared against the FDS simulations, and the maximum temperatures agreed in~4.3 % error, showing the applicability of FDS in the interpretation of the fire phenomena. In the aspect of the sensitivity to the grid size for the subway fire, FDS results of smoke temperature, CO concentration and visibility converged and showed no distinct changes for the grid size < 28(L)×28(W)×14(H), guaranteeing that the FDS fire model set in this research could interpret the fire phenomena successfully.
잠재적 폭발 위험성을 고려한 단단 혼합냉매 LNG 공정의 설계 변수 최적화
김익현 ( Ik Hyun Kim ),단승규 ( Seung Kyu Dan ),조성현 ( Seong Hyun Cho ),이기백 ( Gi Baek Lee ),윤인섭 ( En Sup Yoon ) 한국화학공학회 2014 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.52 No.4
Preliminary design in chemical process furnishes economic feasibility through calculation of both mass balance and energy balance and makes it possible to produce a desired product under the given conditions. Through this design stage, the process possesses unchangeable characteristics, since the materials, reactions, unit configuration, and operating conditions were determined. Unique characteristics could be very economic, but it also implies various potential risk factors as well. Therefore, it becomes extremely important to design process considering both economics and safety by integrating process simulation and quantitative risk analysis during preliminary design stage. The target of this study is LNG liquefaction process. By the simulation using Aspen HYSYS and quantitative risk analysis, the design variables of the process were determined in the way to minimize the inherent explosion risks and operating cost. Instead of the optimization tool of Aspen HYSYS, the optimization was performed by using stochastic optimization algorithm (Covariance Matrix Adaptation-Evolution Strategy, CMA-ES) which was implemented through automation between Aspen HYSYS and Matlab. The research obtained that the important variable to enhance inherent safety was the oper-ation pressure of mixed refrigerant. The inherent risk was able to be reduced about 4~18% by increasing the operating cost about 0.5~10%. As the operating cost increases, the absolute value of risk was decreased as expected, but cost effectiveness of risk reduction had decreased. Integration of process simulation and quantitative risk analysis made it possible to design inherently safe process, and it is expected to be useful in designing the less risky process since risk factors in the process can be numerically monitored during preliminary process design stage.
상온 상압의 이산화탄소 저장용 탱크를 위한 예냉과정의 비선형 모델링 및 비례-적분 제어 적용
임유경 ( Yu Kyung Lim ),이석구 ( Seok Goo Lee ),단승규 ( Seung Kyu Dan ),고민수 ( Min Su Ko ),이종민 ( Jong Min Lee ) 한국화학공학회 2014 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.52 No.5
Storage tanks of Carbon dioxide (CO2) carriers utilized for the purpose of carbon capture and storage(CCS) into subsea strata have to undergo a pre-cooling session before beginning to load cryogenic liquid cargos inorder to prevent physical and thermal deterioration of tanks which may result from cryogenic CO2 contacting tankwalls directly. In this study we propose dynamic model to calculate the tank inflow of CO2 gas injected for precoolingprocess and its dynamic simulation results under proportional-integral control algorithm. We selected two cases inwhich each of them had one controlled variable (CV) as either the tank pressure or the tank temperature and discussedthe results of that decision-making on the pre-cooling process. As a result we demonstrated that the controllinginstability arising from nonlinearity and singularity of the mathematical model could be avoided by choosingtank pressure as CV instead of tank temperature.
윤인섭 ( En Sup Yoon ),장남진 ( Nam Jin Jang ),단승규 ( Seung Kyu Dan ),신동일 ( Dong Il Shin ),이기백 ( Gi Baek Lee ) 한국화학공학회 2013 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.51 No.2
Sustainability, in general, means the protection of environmental resources and economic prosperity, with the consideration of the social, economic and environmental effect, as well as human health and the enhancement of life. Profound consideration about sustainability has to handle the overall cycle of feedstock, resource extraction, transportation and production in addition to the environmental effect. Sustainable development of the chemical industries should be carried out complementarily by strengthening the chemical process safety of the industries. In this respect, chemical process safety can be called an opportunity to enhance the compatibility internationally. Changing new paradigm in chemical process safety is formed from the overall life cycle considering basic design of existing systems and production processes. To improve the chemical process safety, the integrated smart system is necessary, comprising various chemical safety database and knowledge base and improved methods of quantitative risk analysis, including management system. This paper discussed the necessity of overall life cycle in chemical process safety and proposed new technology to improve the sustainability. To develop the sustainable industries in process systems engineering, three S, which include Safety, Stability and Security, will have to be combined appropriate.