The explosion limits of methane and air premixed gas at 30～100 ℃ and 0.1～1.0 MPa was measured by gas explosion limit test device to study the change rule of explosion limit.The length of explosion tube was 1 500 mm and the diameter of explosion tube was 260 mm.The experimental results indicated that:with the rising of initial temperature and initial pressure,the explosion scope of methane is widened and the explosion risk increases.When the initial temperature comes to 100 ℃ with the initial pressure reaching 1.0 MPa,the lower explosion limit of methane is 5.25％ which does not change obviously with the change of temperature and pressure.Under the same condition,the upper explosion limit is 27％.Compared with the data under lower temperature and pressure,the upper explosion limit changes obviously with the change of temperature and pressure.The change rule of upper explosion limit affected by initial temperature and initial pressure was fitted by SPSS and the fitting formula was obtained.%采用气相爆炸极限测试装置研究甲烷与空气的预混气体在30～100、0.1～1.0 MPa下爆炸极限的变化规律.爆炸管体长1 500 mm,直径260 mm.实验结果表明:随着初始温度和初始压力升高,甲烷爆炸范围变宽,爆炸危险性升高.100、1.0 MPa时甲烷爆炸下限为5.25％,不随温度、压力出现明显的变化;爆炸上限为27％,爆炸上限随温度、压力变化明显.用SPSS对初始温度和初始压力耦合下爆炸上限的变化规律进行拟合,得出拟合公式.
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