The Methodology for Prediction and Control of Hazardous Chlorine Gas Flow Releases as Meteorological Data

기상조건에 따른 유해독성염소가스의 가상흐름누출에 관한 예측 및 제어론

  • Kim, Jong-Shik (Department of Chemical Engineering, Keimyung University) ;
  • Park, Jong-Kyu (Department of Chemical Engineering, Keimyung University)
  • 김종식 (계명대학교 화학공학부) ;
  • 박종규 (계명대학교 화학공학부)
  • Received : 1999.08.02
  • Accepted : 1999.11.18
  • Published : 1999.12.10

Abstract

The screening methodology modeling, dispersion modeling procedures for continuous and instantaneous releases of the gas phase flow from the storage tank and pressure relief valve were considered. This study was performed to develop the screening methodology for prediction and control of hazardous/toxic gas releases by estimating the 1-hr average maximum ground-level concentration of $Cl_2$ gas vs. downwind distance by incorporating source term model including the general/physical properties of released material and release mode of the $Cl_2$ storage tank of the chemical plant facilities, dispersion model, and meteorological/topographical data into the TSCREEN model. As the results of the study, it was found that dispersion modes of the dense gas were affected by the state of the released material, the released conditions, physical-chemical properties of released material, and the released modes (continuous and instantaneous releases), and especially largely affected by initial (depressurized) density of the released material and release emission rate as well as the wind velocity. Especially, this study was considered to release hazardous material as meteorological data. It was thought that this screening methodology can be useful as a preliminary guideline for application of the refined analysis model by developing the generic sliding scale methodology for various senarios selected.

Keywords

screening methodology;$Cl_2$ gas;TSCREEN model;analysis model;sliding scale

References

  1. EPA-454/R-92-024 Workbook of Screening Technologies for Assessing Impacts of Toxic Air Pollutants(Revised) USEPA
  2. User's Manual for ISCST Trinity Consultants
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  9. Center for Chemical Process Safety Guidelines for Use of Vapor Cloud Dispersion Models AIChE/CCPS