포스터 전시회 : 지하복합발전플랜트의 가스 누출 및 확산 거동에 관한 수치해석 = Poster Session : Numerical Analysis of Gas Leakage and Diffusion Behavior in Underground Combined Cycle Power Plant

다국어 초록 (Multilingual Abstract)

It has been reported that the leakage accident frequently happens which can cause serious fire at the gas transportation at the power plant. Especially, a combined cycle power plant (CCPP) in underground might be exposed to substantial human injury and facility damage. The main objective of present study is to investigate the effect of crack sizes on transient evolution of temperature and concentration of leakage gas under various accident scenarios. The commercial code (ANSYS FLUENT V.16.1) was used to predict the three-dimensional thermo-fluid flows. To analysis the quantitative risk assessment (QRA) factor, such as flammable volume ratio, radius of damage, and transient numerical analysis were carried out for different scenarios, and LNG volume fraction in closed space were estimated in time. From the numerical results, the maximum propagation length of LNG gas concentration between 2.5% and 15% increased with the crack size. LNG gas is rapidly spread by convection in confined space because of the high release rate of LNG and the circulation flow was shown after generating the secondary flow at the upper wall. The study is expected to be used later as the basis for accident through the consequence risk analysis, we provide QRA results in the development of a fuel leakage.