摘要
为了确保合成气在工业生产与使用中的安全,通过自行搭建的试验系统研究了不同H_(2)体积分数的H_(2)/CO/空气预混气体爆炸压力振荡特性,同时利用理论计算了量纲一因素对压力振荡的影响。结果表明,在H_(2)体积分数为70%时,合成气在密闭管道存在燃烧诱导快速相变现象。在开口管道中,当H_(2)体积分数为50%和70%时,爆炸超压最大值发生在曲线后期高频振荡阶段。燃烧诱导快速相变发生在开口管道中,且H_(2)体积分数的变化对超压峰值和超压振荡的变化起着重要作用。不同H_(2)体积分数的振荡周期都属于10-4同一数量级,表明H_(2)体积分数对振荡周期没有影响。随着H_(2)体积分数的增加,振荡平均幅值逐渐增加,超压振荡现象更加明显。通过理论分析,燃烧诱导快速相变受量纲一因素的影响,是火焰传播阶段、水和壁面凝结阶段,以及火焰和冷壁面辐射热交换阶段三者共同驱动的。研究结果对于预防合成气爆炸故发生具有指导意义。
To ensure the safety of syngas in industrial production and use,the explosion pressure oscillation characteristics of H_(2)/CO/Air premixed gas with different hydrogen volume fractions are studied in this paper through an experimental system built by ourselves,and the influence of dimension one factors on the pressure oscillation is also calculated using theory.It is found that the combustion-induced rapid phase transformation of syngas occurs when the hydrogen volume fraction is 70%.With the gradual increase in the hydrogen volume fraction,the overpressure curve then appears as a more obvious combustion-induced rapid phase transition phenomenon,the explosion generated by the first peak value of the overpressure gradually increases.In the open pipe,when the hydrogen volume fraction is 50%and 70%,the maximum explosion overpressure occurs in the high-frequency oscillation stage at the later stage of the curve.When the volume fraction of hydrogen is 50%,the first peak explosion overpressure and the maximum explosion overpressure are 0.043 MPa and 0.111 MPa,respectively;when the volume fraction of hydrogen is 70%,the first peak explosion overpressure and the maximum explosion overpressure are 0.057 MPa and 0.162 MPa,respectively.It is found that the combustion-induced rapid phase transition does occur in the open pipe,and the change of hydrogen volume fraction plays an important role in the change of overpressure peak and overpressure oscillation.The oscillation periods of different hydrogen volume fractions all belong to the same order of magnitude of 10^(-4),indicating that hydrogen volume fraction does not affect the oscillation period.With the increase of hydrogen volume fraction,the average amplitude of oscillation increases gradually,and the overpressure oscillation becomes more obvious.As the dimension one factorsθ1 andθ2 gradually increase,the oscillation phenomenon is strengthened.The theoretical analysis indicates that the flame propagation stage and the condensation stage of the water and wall surface are jointly driven,as well as the heat exchange stage between the flame and the cold wall surface through radiation and the condensation stage of the water and wall surface are jointly driven.The results of the study have implications for preventing the occurrence of syngas explosions.
作者
李宇峰
申宏栋
LI Yufeng;SHEN Hongdong(Jiaozuo Coal Industry Group,Jiaozuo 454000,Henan,China)
出处
《安全与环境学报》
CAS
CSCD
北大核心
2024年第4期1362-1370,共9页
Journal of Safety and Environment
关键词
安全工程
合成气
爆炸
振荡
量纲一因素
凝结
辐射
safety engineering
syngas
explosion
oscillation
dimension one factor
condensation
radiation
