This study examined into property of flour dust explosion to get the basic data for safety of industry by protecting accident of dust explosion. The experiment was conducted to know the effect of distance between explodes in the experiment device, effect of flour dust concentration, effect of humidi...
This study examined into property of flour dust explosion to get the basic data for safety of industry by protecting accident of dust explosion. The experiment was conducted to know the effect of distance between explodes in the experiment device, effect of flour dust concentration, effect of humidity, effect of explosion pressure to the dust concentration and effect of inactive substance additive. The study indicated that explosion was happened effectively at the optimum distance 100mm or less in inter-polar distance, and minimum ignition energy was measured at 6mm. The data of feed concentration to the probability of explosion showed that the smaller the particle diameter was, the larger probability of explosion was, and the higher the dust concentration was, the more increased the pressure of explosion was, but more than upper limit of dust concentration, then the explosion of pressure decreased. For the effect of humidity, the more it contained water, the more decreased the ignition energy of dust was, so increased minimum explosive concentration, and effective water content was minimum 10% or more. Inactive substance additive was effective in adding more than 15% CaCO3 and CaO as substance inhibiting dust explosion, in which CaCO3 was more effective than CaO. the analysis of the flame of dust explosion was performed by high-speed video camera, it showed the size of flame bacame smaller in order that sub feed, main feed, wheat powder. As a result, sub feed was expected to be less dangerous than others.
This study examined into property of flour dust explosion to get the basic data for safety of industry by protecting accident of dust explosion. The experiment was conducted to know the effect of distance between explodes in the experiment device, effect of flour dust concentration, effect of humidity, effect of explosion pressure to the dust concentration and effect of inactive substance additive. The study indicated that explosion was happened effectively at the optimum distance 100mm or less in inter-polar distance, and minimum ignition energy was measured at 6mm. The data of feed concentration to the probability of explosion showed that the smaller the particle diameter was, the larger probability of explosion was, and the higher the dust concentration was, the more increased the pressure of explosion was, but more than upper limit of dust concentration, then the explosion of pressure decreased. For the effect of humidity, the more it contained water, the more decreased the ignition energy of dust was, so increased minimum explosive concentration, and effective water content was minimum 10% or more. Inactive substance additive was effective in adding more than 15% CaCO3 and CaO as substance inhibiting dust explosion, in which CaCO3 was more effective than CaO. the analysis of the flame of dust explosion was performed by high-speed video camera, it showed the size of flame bacame smaller in order that sub feed, main feed, wheat powder. As a result, sub feed was expected to be less dangerous than others.
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문제 정의
본 연구에서는 위와 같은 특성치 연구를 위해 가연성 물질 중 사료에 대한 실험을 실시하였고 전극간 거리, 사료 분진의 농도 및 수분 등의 여러 변수를 통해 사료 분진의 폭발 특성 실험치를 도출하였으며 본 연구를 통해 화재·폭발 에방 대책에 효율적인 기초자료를 제공하여 산업안전에 기여하고자 한다.
제안 방법
본 실험에 사용한 실험 장치는 Hartman식 분진폭발 장치로 폭발통부, 분산부, 공기공급부 및 전기에너지공급부로서 실험장치의 전체 구성도는 [Figure 1]과 같다. 폭발통부는 폭발통, 폭발통취부대로 구성되며, 폭발통은 투명한 파이렉스제의 내열유리로 분진폭발통의 내부 부피는 1.17x10-3m3이며 폭발통취부대의 상부에 고정되고, 상부는 마개(종이 등)의 착탈이 가능하게 되어 있으며 마개부분에 온도센서(Model M-107K)와 압력센서(PCB, Piezotronics, INC, USA, Nodel 494A)를 설치하여 폭발 시 온도와 압력을 측정하도록 하였다. 측벽에는 착화용 방전전극 2개를 마주보는 형태로 장착하였다.
대상 데이터
본 실험에 사용한 실험 장치는 Hartman식 분진폭발 장치로 폭발통부, 분산부, 공기공급부 및 전기에너지공급부로서 실험장치의 전체 구성도는 [Figure 1]과 같다. 폭발통부는 폭발통, 폭발통취부대로 구성되며, 폭발통은 투명한 파이렉스제의 내열유리로 분진폭발통의 내부 부피는 1.
참고문헌 (6)
小林義隆,"作業環境의の有害物質測定法", ユロナネヒ, 1976
이창우 외3명,"가축사료의 분진폭발 위험성에 관한 연구", 韓國火災 消防學會誌, 제12권2호, 1998년 6월
강석호,"분진폭발의 예방과 방재", 화학공업과 기술, 제4권 제2호, 1986
坂下, 掘江, 小大曾, 안전공학, 14-4, 250, 1975
최일곤 외 5명, "소나무 분진의 최소착화에너지와 폭발한계 측정에 관한 연구", Journal of the KoreanㅇInstitute of Gas, Vol.2, No.2, June, 1998.
한우섭, "이송 배관 내 분진폭발의 화염전파특성", 화학공학 제47권 제5호, 2009년 10월
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