증기운 폭발 사례 비교를 통한 멀티에너지법의 폭발강도계수 지침 개선
Improvement of Charge Strength Guideline for Multi-Energy Method by Comparing Vapor Cloud Explosion Cases
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초록
증기운 폭발의 폭압을 예측하거나 위험성 분석을 위하여 다양한 폭압 산정법이 존재하지만 대표적으로 경험적 방법인 TNT 등가량환산법과 멀티에너지법을 주로 사용한다. 멀티에너지법은 환경적 요인을 고려한 폭발강도계수를 사용한다. 본 연구에서는 문헌 분석을 통하여 점화원 강도를 세분하고 강도분류를 확장하여 개선한 폭발강도계수 가이드라인을 제안하였다. 개선한 폭발강도계수 가이드라인의 합리성 검증과 기존 Kinsella 가이드라인과의 비교를 위하여 실제 추정 폭압과 대조가 가능한 4가지의 증기운 폭발 사례를적용하였다. 결과적으로 기존 Kinsella 가이드라인은 실제 추정 폭압에 비하여 광범위하거나 부정확한 폭압 산정 결과를 나타내는 것으로 확인하였다. 반면, 개선한 폭발강도계수 가이드라인은 명확한 점화원의 강도 선정이 가능하고 분류의 확장을 통하여 더욱 세분화된 계수 값의 선정이 가능함에 따라 실제 사례와 비교적 유사한 폭압 산정이 가능하다.
Abstract
Various blast pressure calculation methods have been developed for predicting the explosion pressure of vapor cloud explosions. Empiricalmethods include the TNT equivalent method, and multi-energy method. The multi-energy method uses a charge strength that considersenvironmental factors. Although the Kinsella guideline was provided to determine the charge strength, there are limitations such as guidelinesrelated to ignition sources. In this study, we proposed an improved charge strength guideline, by subdividing the ignition source intensity andexpanding the type classification through literature analysis. To verify the improved charge strength guideline, and to compare it with theresult obtained using the Kinsella guideline, four vapor cloud explosion cases which could be used to estimate the actual blast pressure wereinvestigated. As a result, it was confirmed that the Kinsella guidelines showed an inaccurate, that is, wider pressure than the actual estimatedblast pressure. However, the improved charge strength guideline enabled the selection of the intensity of the ignition source, and more subdividedtypes through the expansion of classification, hence it was possible to calculate the blast pressure relatively close to that of the actual case.
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