A、2%~10%
B、5%~15%
C、10%~15%
D、15%~20%
A.沸点
B.燃点
C.闪点
A.石油、天然气具有易燃、易爆、易挥发的特点
B.石油液体产品蒸发的气体,与空气混合就可以产生可爆性气体
C.一定比例范围之内的混合气体一遇到明火就会产生爆炸
D.一定比例范围之内的混合气体一遇到静电就会产生爆炸
天然气和空气混合,当天然气浓度在一定范围内时,遇明火就会发生燃烧和爆炸。燃烧时,燃烧波的传播速度较慢,约0.3~2.4m/s,而爆炸时,会迅即产生高压高温,波速达到1000~3000m/s,对管线和容器的破坏力很大。天然气产生爆炸的浓度范围为5~15%,随温度、压力升高,爆炸浓度的上限提高,爆炸范围扩大。Natural gas and air mix, when the concentration of natural gas within a certain range, open fire will occur combustion and explosion. In combustion, the propagation speed of combustion wave is slow, about 0.3 ~ 2.4m/s, while in explosion, the high pressure and temperature will be generated immediately, and the wave speed reaches 1000 ~ 3000m/s, which is very destructive to pipelines and containers. The explosion concentration range of natural gas is 5 ~ 15%. With the increase of temperature and pressure, the upper limit of explosion concentration increases and the explosion range expands.
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