(137a) New Approach to Using CFD Modeling for Chlorine Releases in Seoul

Reinforced control of chemicals and chemical accidents, so called Chemical Control Act (CCA) was initiated when hydrogen fluoride leaked from a chemical plant in Gumi, S. Korea in 2012. This incident gave rise to greater social demand for a system to prevent and respond to chemical accidents. As part of this, consequence analysis is done for chlorine which is one of the most widely used chemicals in the world, especially for water purification plants near populated areas. Therefore, when a chlorine release occurs in a water purification plant, the damage would fatally spread to the residents and widely affect people in the residential area.  

In this study, CFD (Computational Fluid Dynamic) simulations are performed for a possible Cl₂ leak scenario in the urban area of Seoul, S. Korea where the population density is very high and numerous buildings exist near the plant in operation. FLACS is used to predict the dispersion results for the area whose size is around 5 by 3 km. In fact how precisely implementing 3D geometries is the key for successful 3D simulation. For that a methodology is suggested to rapidly implement geometry by importing CAD files provided by the government agency, and processing them. One accidental release from 1 ton of trailer was simulated with 2 different weather conditions and 3 different wind directions in order to show how far evacuation distance should be expected.