复杂管网中支路增设通风设施对瓦斯爆炸超压传播的影响

Effect of additional ventilation facilities on the overpressure propag-ation of gas explosions in branch circuits of complex pipeline network

为了探究复杂管网中通风设施对瓦斯爆炸超压传播的影响,利用自行研制的瓦斯爆炸组合式管网实验系统(“F+L”型管网),研究了不同体积分数甲烷、不同支路增设不同强度通风设施对瓦斯爆炸超压变化幅度的影响。结果表明:在进行空管爆炸时发现爆炸越剧烈,爆炸超压在截面突变段的衰减幅度越小,甲烷体积分数为6%、8%、9.5%、11%及13%时衰减幅度分别为4.44%、1.85%、0.64%、1.31%及1.32%;在五种浓度甲烷爆炸实验中发现,支路二增设通风设施会降低支路一中的超压衰减,平均超压衰减幅度由29.47%降至27.63%,而支路一增设通风设施会增加支路二的超压衰减,平均超压衰减幅度由25.84%增加至35.46%;通风设施强度的提升会增加拐弯支路附近的超压数值,五种浓度下超压数值平均增加0.02 MPa。

This paper aims to investigate the influence of ventilation facilities on the propagation of gas explosion overpressure in complex pipeline networks.The experiment utilizes self-developed experimental system of the gas explosion combined pipeline network("F+L"type pipeline network)to study the influence of methane with different volume fractions and ventilation facilities with different strengths in different branch circuits on the change amplitude of gas explosion overpressure.The results show that the more intense the empty tube explosion is,the smaller the attenuation amplitude of the explosion overpressure in the sudden change cross-section is,and when the methane volume fractions are 6%,8%,9.5%,11%and 13%,the attenuation amplitudes are 4.44%,1.85%,0.64%,1.31%and 1.32%,respectively;In methane explosion experiments with five concentrations,the overpressure attenuation in branch I can be reduced by the additional ventilation facilities in brand II,and the average overpressure attenuation amplitude decreases from 29.47%to 27.63%,while the overpressure attenuation in branch II can increase by the additional ventilation facilities in brand I,and the average overpressure attenuation amplitude increases from 25.84%to 35.46%.The numerical value of overpressure near the corner branch can increase along with the raise of the ventilation facilities strength,which averagely increases by 0.02 MPa under five concentrations.