The upper explosion limits of CH4/C2H6 and C2H6/H2O mixtures at elevated temperatures and pressures in oxygen
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摘要: 采用自主搭建的5 L可燃气体爆炸特性实验平台，测量了初始温度200-270 ℃、初始压力0.4～0.6 MPa条件下，不同甲烷掺混比及水蒸气浓度的CH4/C2H6、C2H6/H2O在纯氧中的爆炸上限，揭示了初始压力、初始温度、甲烷掺混比、水蒸气浓度对乙烷爆炸上限的影响。结果表明，初始温度为200 ℃、初始压力在0.4～0.6 MPa范围时，甲烷掺混比（0～0.5）对CH4/C2H6混合气爆炸上限的影响很小；随着初始压力的提高，CH4/C2H6混合气的爆炸上限均提高，且提高幅度逐渐降低；随着水蒸气浓度的提高（0～40%），C2H6/H2O混合气的爆炸上限大致呈线性降低；随着初始压力的提高，C2H6/H2O混合气的爆炸上限均提高。初始压力为0.5 MPa时，初始温度由200 ℃升至270 ℃，纯乙烷和C2H6/H2O混合气（水蒸气浓度为40%）的爆炸上限均随温度的升高而升高，且纯乙烷爆炸上限的增幅呈上升趋势。
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关键词:
- 高温 /
- 高压 /
- CH4/C2H6混合气 /
- C2H6/H2O混合气 /
- 爆炸上限
Abstract: The explosion limit serves as a key parameter for assessing explosion risks and prevention strategies of combustible gases. Through a self-developed 5-liter experimental platform for flammable gas explosion characteristics, the upper explosive limits (UELs) of CH4/C2H6 andC2H6/H2O gas mixtures under high-temperature and high-pressure conditions were investigated, revealing the influence mechanisms of methane blending ratios and steam concentrations on the UELs of ethane under such extreme environments. The results demonstrate that methane blending ratios (0-0.5) exhibit minimal influence on the UELs of CH4/C2H6 mixtures at 200℃ and 0.4-0.6 MPa, and the UELs of CH4/C2H6 mixtures increase with increasing initial pressure, while exhibiting a progressively diminishing rate of UEL increment. Under identical thermal conditions (200℃, 0.4-0.6 MPa), the UELs of C2H6/H2O mixtures decrease approximately linearly with increasing water vapor concentrations (0-40%). Conversely, higher initial pressures enhance the UELs of C2H6/H2O mixtures. Notably, under 0.5 MPa pressure, as temperature increases from 200℃ to 270℃, the UELs of both pure ethane and C2H6/H2O mixtures containing 40% water vapor increase with a rise in temperature, with pure ethane demonstrating an accelerating UEL increase rate.-
Key words:
- elevated temperature /
- elevated pressure /
- CH4/C2H6 mixtures /
- C2H6/H2O mixtures /
- upper explosion limit
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图 2 CH4/C2H6混合气在纯氧中的爆炸上限随甲烷掺混比的变化（初始温度为200 ℃）
Figure 2. The variation of the upper explosive limit of a CH4/C2H6 gas mixture in pure oxygen as a function of methane blending ratio at a constant initial temperature of 200 ℃
图 3 CH4/C2H6混合气在纯氧中的爆炸上限随初始压力的变化（初始温度为200 ℃）
Figure 3. The variation of the upper explosive limit of a CH4/C2H6 gas mixture in pure oxygen as a function of initial pressure at a constant initial temperature of 200 ℃
图 4 乙烷的压力指数随当量比的变化
Figure 4. Variation of pressure exponent of ethane with equivalence ratio
图 5 C2H6/H2O混合气在纯氧中的爆炸上限随水蒸气浓度的变化（初始温度为200 ℃）
Figure 5. The variation of the upper explosive limit of a C2H6/H2O gas mixture in pure oxygen as a function of water vapor concentration at a constant initial temperature of 200 ℃
图 6 爆炸上限处乙烷在乙烷和氧气中的体积占比随水蒸气浓度的变化
Figure 6. The variation of the volume percentage of ethane in the ethane-oxygen mixture at the upper explosive limit as a function of water vapor concentration
图 7 拟合公式对C2H6/H2O混合物爆炸上限的预测值与本文实验值的对比
Figure 7. Comparison between the predicted explosion upper limit of C2H6/H2O mixture by fitting formula and the experimental values in this paper
图 8 C2H6/H2O混合气在纯氧中的爆炸上限随初始压力的变化（初始温度为200 ℃）
Figure 8. The variation of the upper explosive limit of a C2H6/H2O gas mixture in pure oxygen with initial pressure at a constant initial temperature of 200 ℃
图 9 乙烷和C2H6/H2O混合气的爆炸上限随初始温度的变化（初始压力为0.5 MPa）
Figure 9. The variation of the upper explosive limits of ethane and ethane/water vapor mixtures as a function of initial temperature under a constant initial pressure of 0.5 MPa
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