본 연구에서는 마그네슘분의 폭발위험성을 고찰하기 위하여 Hartman식 분진폭발 시험장치(폐쇄형)와 연소속도시험기를 이용하여 마그네슘과 마그네슘-알루미늄 합분, 마그네슘 chip에 대한 폭발위험성의 개연성을 확인하였다. 연구결과, 마그네슘과 마그네슘-알루미늄 합분의 폭발 최고온도는 $790^{\circ}C{\sim}990^{\circ}C$ 범위로 나타났으며, 최고온도에 도달하는 시간은 중량이 클수록, 입자가 작을수록 매우 빠르고 시간차이는 큰 것을 확인할 수 있었다. 내용적 $1600cm^3$에 대한 마그네슘 합분 최대압력은 14.5 bar 이었으며, 입자가 작을수록 2.16~8.53배 높게 압력이 형성되어 연소속도가 빠르게 진행됨을 알 수 있었다. 수분접촉 시에는 급속히 연소가 진행되었으며, 부피 팽창으로 부유되는 현상이 식별되었다. 또한, 외부점화원(산소절단, 전기용접, 그라인더 불티, 전기단락)에 의한 착화는 그라인더 불티의 경우에 휴대폰 케이스에서만 착화가 진행되지 않았으며, 발화 개연성이 매우 높음을 확인할 수 있었다.
본 연구에서는 마그네슘분의 폭발위험성을 고찰하기 위하여 Hartman식 분진폭발 시험장치(폐쇄형)와 연소속도시험기를 이용하여 마그네슘과 마그네슘-알루미늄 합분, 마그네슘 chip에 대한 폭발위험성의 개연성을 확인하였다. 연구결과, 마그네슘과 마그네슘-알루미늄 합분의 폭발 최고온도는 $790^{\circ}C{\sim}990^{\circ}C$ 범위로 나타났으며, 최고온도에 도달하는 시간은 중량이 클수록, 입자가 작을수록 매우 빠르고 시간차이는 큰 것을 확인할 수 있었다. 내용적 $1600cm^3$에 대한 마그네슘 합분 최대압력은 14.5 bar 이었으며, 입자가 작을수록 2.16~8.53배 높게 압력이 형성되어 연소속도가 빠르게 진행됨을 알 수 있었다. 수분접촉 시에는 급속히 연소가 진행되었으며, 부피 팽창으로 부유되는 현상이 식별되었다. 또한, 외부점화원(산소절단, 전기용접, 그라인더 불티, 전기단락)에 의한 착화는 그라인더 불티의 경우에 휴대폰 케이스에서만 착화가 진행되지 않았으며, 발화 개연성이 매우 높음을 확인할 수 있었다.
For considering explosion hazard of magnesium powders, in this study, the probability of explosion hazard of magnesium and magnesium-aluminium mixed powders and magnesium chips was analyzed using Hartman's dust explosion test apparatus(closed type) and burning velocity tester.As a result, the maximu...
For considering explosion hazard of magnesium powders, in this study, the probability of explosion hazard of magnesium and magnesium-aluminium mixed powders and magnesium chips was analyzed using Hartman's dust explosion test apparatus(closed type) and burning velocity tester.As a result, the maximum explosion temperature of magnesium and magnesium- aluminium mixed powders ranged from $790^{\circ}C$ to $990^{\circ}C$ and when the particles were heavy in weight and they were small, the time to reach the maximum temperature was very fast and there was a big time difference. The maximum pressure of magnesium alloy powders was 14.5 bar when the content volume was $1600cm^3$ and when the particles were small, the pressure was 2.16 to 8.53 times higher and the burning velocity was fast. When they made contact with moisture, they were burnt rapidly and the suspension phenomenon was found due to volume expansion. Also, only the mobile phone case wasn't ignited by grinder sparks out of various external ignition sources(oxygen cutting, electric welding, grinder sparks and electric circuits) and there was a very high ignition probability.
For considering explosion hazard of magnesium powders, in this study, the probability of explosion hazard of magnesium and magnesium-aluminium mixed powders and magnesium chips was analyzed using Hartman's dust explosion test apparatus(closed type) and burning velocity tester.As a result, the maximum explosion temperature of magnesium and magnesium- aluminium mixed powders ranged from $790^{\circ}C$ to $990^{\circ}C$ and when the particles were heavy in weight and they were small, the time to reach the maximum temperature was very fast and there was a big time difference. The maximum pressure of magnesium alloy powders was 14.5 bar when the content volume was $1600cm^3$ and when the particles were small, the pressure was 2.16 to 8.53 times higher and the burning velocity was fast. When they made contact with moisture, they were burnt rapidly and the suspension phenomenon was found due to volume expansion. Also, only the mobile phone case wasn't ignited by grinder sparks out of various external ignition sources(oxygen cutting, electric welding, grinder sparks and electric circuits) and there was a very high ignition probability.
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