가솔린탱크의 위험성평가를 위한 노말헵탄의 연소특성치 측정 및 고찰

Measurement and Investigation of Combustible Properties of n-Heptane for Risk Assessment of Gasoline Tank

노말헵탄의 안전한 취급을 위해서 <TEX>$25^{\circ}C$</TEX>에서 폭발한계와 폭발한계 온도의존성 그리고 하부인화점을 고찰하였다. 또한 발화지연시간에 의한 발화온도를 측정하였다. 공정의 안전을 위해서 노말헵탄의 폭발하한계는 1.0Vol%, 상한계는 7.0Vol%를 추천하였고, 하부인화점은 <TEX>$-4^{\circ}C$</TEX>를 추천하였다. ASTM E659-78 장치를 사용하여 발화온도와 발화지연시간을 측정하였고, 여기서 측정된 최소자연발화온도는 <TEX>$225^{\circ}C$</TEX>였다. 그리고 노말헵탄의 새로운 폭발한계 온도의존식을 제시하였으며, 제시된 식은 문헌값과 일치하였다.

For the safe handling of n-heptane, the explosion limit at <TEX>$25^{\circ}C$</TEX>, the temperature dependence of the explosion limits and the lower flash point were investigated. And AITs (auto-ignition temperatures) by ignition time delay for n-heptane were experimented. By using the literatures data, the lower and upper explosion limits of n-heptane recommended 1.0 Vol% and 7.0 Vol%, respectively. And the lower flash points of n-heptane recommended <TEX>$-4^{\circ}C$</TEX>. This study measured relationship between the AITs and the ignition delay times by using ASTM E659-78 apparatus for n-heptane and the experimental AIT of n-hexane was <TEX>$225^{\circ}C$</TEX>. The new equation for predicting the temperature dependence of the explosion limits of n-heptane is proposed. The values calculated by the proposed equations were a good agreement with the literature data.