泄爆条件对甲烷气体爆炸参数的影响

Impact of Explosion Venting Condition on Methane Gas Explosion Parameters

为进一步探讨受限空间或管道中气体燃爆泄放的安全设计方法,为工程防爆、泄爆提供借鉴意义和理论支持,结合气体爆炸传播机理,利用AutoReaGas软件对甲烷-空气的混合气体在管道内爆炸进行了数值模拟,获得了每个测点在不同泄爆位置和压力时甲烷气体爆炸产生的压力峰值和温度峰值的相关数据,分析了不同泄爆条件对甲烷气体爆炸特性的影响,得出:泄爆膜距点火点越近,管道内甲烷气体爆炸的压力和温度的最高值相对较高;泄爆压力由0kPa升至10kPa,管道中甲烷爆炸产生的最大压力的下降趋势变缓,不同泄爆压力对最高温度的影响不大.

Studying the safety design method of the engineering explosion prevention and the explosion venting in the limited space or pipe could provide certain reference and theoretical support for such acci-dents that may occur in the actual production.According to the gas explosion propagation equations,a closed pipe model of the methane/air explosion process was established by AutoReaGas Software.The explosion parameters of the peak overpressure and the highest temperature of each measuring point in the condition of three different explosion venting membrane position and different explosion pressure were received.And the effect on methane gas explosion characteristics of different explosion venting ini-tial condition was analyzed.Here are the conclusions：the closer the explosion venting membrane to the ignition point,the higher the relative peak explosion overpressure and temperature are;with the explo-sion venting membrane pressure rising from 0kPa to 10kPa,the peak explosion overpressure curves which produced by methane explosion decline slowly in the pipe.Different venting pressure has little in-fluence on the highest temperature.