预测管道中气体爆炸超压的改进ME法

PREDICTION OF GAS EXPLOSION OVERPRESSURE IN PIPE USING ME MODEL

分析了管道中可燃气体爆炸超压的特点 ,提出了利用ME模型预测管道中气体爆炸超压的新方法 ,在能量守恒定律和爆炸能量相似律分析的基础上结合爆炸反射压力理论修正了ME模型并用于封闭管道中气体爆炸超压的预测 ,利用修正的ME模型计算了甲烷在管道中的爆炸超压 ,对计算值与实验值同ME模型、TNT当量模型的计算值以及数值模拟计算结果进行了比较分析 .实验的管道分别是直径为 2m、长 2 9m的大型圆管和边长为80mm、长 2 4m的小型方管 .数值模拟的独头巷道横截面是方形 ,边长为 1 77m ,巷道全长 30m ,瓦斯填充长度为 6m .比较分析结果表明 :修正的ME模型计算值与实验值以及数值模拟计算结果吻合较好 .该方法可用于管道中气体爆炸灾害事故危险性分析与评估 ,给管道防爆泄压设计和爆炸防护提供重要参考 .

Based on the analysis of the characteristics of gas explosion overpressure in pipe, the ME model was used to predict the overpressure in pipe. The ME model was revised on the basis of the law of conservation of energy and the resembling law of explosion energy to eliminate the error caused by using the original ME model to evaluate gas explosion overpressure in pipe. Then combined with the explosion blast reflecting theory the calculation methods of gas explosion overpressure in one end closed pipe were presented. In order to verify the revised ME model, calculated data were compared with experiment data and the data simulated with CFD software. Cylindrical and square experimental tubes were used. The diameter of the cylindrical tube was 2 m, and the width of the square tube was 80 mm. When carrying out the experiments, firstly some types of pressure sensors were installed at different places of the tube. Then methane mixed with air was filled in the tube. Explosion overpressure can be measured with the data acquisition and analyzing system. The simulated tunnel was square which was 1.77 m wide and 30 m long, The tunnel was closed in one end and open in the other. The concentration of methane in the tunnel was 8.5%. The filling length of methane was 6 m. The results showed that the calculated data coincided with experiment data and that there was good agreement between the calculated data and simulated data. The calculation methods can be used for risk analysis and assessment of flammable gas explosion accidents in pipe. It can also provide important reference for the design of explosion relief venting and safety measures against the effects of gas explosion in pipe.