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研究非常温下温度对烃类可燃气体最小点火能的影响。通过电火花点火方法,以甲烷为试验气体测得最小点火能测试系统的敏感条件,验证测试系统的可靠性。在20~80℃范围内、测试系统可靠、气体敏感体积分数下,测试烃类可燃气体最小点火能随温度的变化规律。结果表明,测试系统的敏感间隙为1.5 mm,敏感电容为60.168p F。试验测得甲烷最小点火能为0.263 m J,与文献值0.28 m J基本一致,测试系统可靠性好。丙烯、异丁烯、异丁烷和环氧乙烷的敏感体积分数分别为4.8%、3.3%、3.2%和8%。在20~80℃范围内,这4种烃类气体的最小点火能都随温度升高呈显著的线性下降趋势。为避免具有同样性质的可燃气体发生燃烧或爆炸危险,需密切关注此类气体自身温度及其生产、储存和工业使用过程的环境温度。
The effect of temperature on the minimum ignition energy of hydrocarbon combustible gas at very cold temperatures was investigated. By spark ignition method, methane as the test gas measured the minimum ignition can test the sensitivity of the system to verify the reliability of the test system. In the range of 20 ~ 80 ℃, the reliability of the test system, the gas-sensitive volume fraction, the minimum ignition energy of hydrocarbon combustible gases with temperature changes. The results show that the test system has a sensitive gap of 1.5 mm and a sensitive capacitance of 60.168pF. The minimum ignition energy of methane measured by the experiment is 0.263 m J, which is basically consistent with the reference value of 0.28 m J, and the test system has good reliability. The sensitive volume fractions of propylene, isobutylene, isobutane and ethylene oxide were 4.8%, 3.3%, 3.2% and 8%, respectively. In the range of 20 ~ 80 ℃, the minimum ignition energies of these four kinds of hydrocarbon gases showed a significant linear decrease with increasing temperature. To avoid the risk of a flammable or explosive flammable gas of the same nature, close attention must be paid to the ambient temperature of the gas itself and its ambient temperature during its production, storage and industrial use.