第6题
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.
第9题
A. 天然气是一种比较理想的燃料。
B. 一般来说,凡是能够燃烧液体燃料的燃烧室只要适当更换供气机构后,就有可能改烧天然气。
C. 由于天然气燃烧火焰比较透明,热辐射强,会降低火焰管的使用寿命。
D. 燃烧天然气时假如控制不当,就有发生爆炸的危险。
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