Experimental Study on the Thermal Effect according to the Distance around a Hydrogen Jet Flame

Abstract

In this study, the safe distance in the case of a hydrogen vehicle fire was analyzed according to the temperature distribution around a hydrogen gas jet flame formed by the thermally activated pressure relief device operation of a hydrogen storage container. The experiment was conducted while 70 MPa hydrogen gas was released from a 1.8-mm-diameter nozzle to a 1.8- × 1.8 m fire-resistant structure wall for distances of 2 and 4 m between the nozzle output and the wall. To analyze the temperature around the hydrogen gas jet flame, five fire-fighting heat-protective hood test samples, certified by the Korea Fire Institute, and temperature sensors were installed every 1 m from the center of the jet flame in the vertical direction to the direction of the flame. In the experiment, the temperature around the jet flame was measured to observe the safe distance for firefighters. The results show that the safe distances at 70°C or less, which is harmless to firefighters, were 5 m without a heat-protective hood and 3 m with a heat-protective hood. In addition, it was confirmed that the direction of the jet flame and blocking by obstacles affect the safe distance during fire-fighting and rescue activities by firefighters.

The Safety of Hydrogen Jet-flame Suppression Training

“…3 , 2022 32 급계획에 대한 이행사항 등이 활발하게 진행되고 있다 (1) . 이처럼 수소산업에 대해 수소생산 저장 운송 활용 전 주기 --⋅ 에 걸쳐 안전관리 기준 및 부품 제품의 안전성 평가를 강화 ⋅ 하고 관련 법령 제 개정을 통한 안전관리 체계 향상을 추진 , ⋅ 하고 있으나 (2,3) 등 Kwon (5) 은 이격거리에 따른 수소제트화염 실험을 통하여 방열두건에 미치는 열적영향을 분석하여 안전거리를 제안하였 으며 과 , Kang Lee (6) 는 수소충전소 사고시나리오를 위험성 평가 프로그램에 적용하여 노즐의 구경 충전압력에 따른 피해 범위 , 를 평가하였다 등 . Makarov (7)…”