摘要
采用自主搭建的5L可燃气体爆炸特性实验平台,测量了初始温度为200~270℃、初始压力为0.4~0.6MPa的条件下,不同甲烷掺混比及水蒸气浓度的CH_(4)/C_(2)H_(6)、C_(2)H_(6)/H_(2)O在纯氧中的爆炸上限,揭示了初始压力、初始温度、甲烷掺混比和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℃、初始压力为0.4~0.6MPa时,甲烷掺混比(0~0.5)对CH_(4)/C_(2)H_(6)混合气爆炸上限的影响很小;随着初始压力的提高,CH_(4)/C_(2)H_(6)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%),C_(2)H_(6)/H_(2)O混合气的爆炸上限大致呈线性降低;随着初始压力的提高,C_(2)H_(6)/H_(2)O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C_(2)H_(6)/H_(2)O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。
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 CH_(4)/C_(2)H_(6) and C_(2)H_(6)/H_(2)O 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 CH_(4)/C_(2)H_(6) mixtures at 200℃and 0.4-0.6 MPa,and the UELs of CH_(4)/C_(2)H_(6) 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 C_(2)H_(6)/H_(2)O mixtures decrease approximately linearly with increasing water vapor concentrations(0-40%).Conversely,higher initial pressures enhance the UELs of C_(2)H_(6)/H_(2)O mixtures.Notably,under 0.5 MPa pressure,as temperature increases from 200℃to 270℃,the UELs of both pure ethane and C_(2)H_(6)/H_(2)O mixtures containing 40%water vapor increase with a rise in temperature,with pure ethane demonstrating an accelerating UEL increase rate.
作者
吴传栋
曹栋
祁畅
闫兴清
喻健良
WU Chuandong;CAO Dong;QI Chang;YAN Xingqing;YU Jianliang(School of Chemical Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China)
出处
《爆炸与冲击》
北大核心
2025年第8期1-8,共8页
Explosion and Shock Waves
基金
国家自然科学基金(52174167,52374184)。
