Experimental study of low‐concentration gas explosion in large‐scale pipeline,Energy Science & Engineering

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Experimental study of low‐concentration gas explosion in large‐scale pipeline
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2020-02-26 , DOI: 10.1002/ese3.652
Lei Li _{1,

2} , Zhigang Zhang ₂ , Peng Liu ₁ , Kequan Wang ₂ , Jun Zhang ₂ , Xuelong Li _{1,

3}

Affiliation

Low‐concentration gas is one of the most realistic and reliable supplementary or alternative energy sources of conventional natural gas, which has a wide range of applications. However, this gas is flammable and explosive during pipeline transportation and easily causes an explosion. In order to achieve safe transmission, the explosion characteristics and propagation law of low‐concentration gas are systematically studied through a large‐scale pipeline experimental system. We found that the peak pressure of low‐concentration gas explosion in pipeline has a quadratic function relationship with the propagation distance. Moreover, the peak pressure of gas explosion initially decreases from the explosion source, and then a turning point appears after a certain distance of propagation, which is followed by a sharp increase of peak pressure of gas explosion. The explosion pressure becomes maximum at the outlets of a pipeline. The arrival time of explosion flame is logarithmically relevant to propagation distance, while the speed of flame propagation gradually increases along with the increase of propagation distance. The flame propagation is faster at the exit point. In addition, the diameter of pipeline has also an important influence on the explosion propagation process of low‐concentration gas. So, the larger the diameter, the higher the explosion pressure. The explosion pressure of DN700 pipeline is obviously higher than that of DN500, and the explosion pressure rises faster; the speed of flame propagation of gas explosion in DN700 pipeline is also higher than that in DN500 pipeline. This study provides a theoretical reference for the prevention and control of explosion accidents in low‐concentration gas pipelines.

中文翻译：

大型管道中低浓度瓦斯爆炸的实验研究

低浓度气体是常规天然气的最现实，最可靠的补充或替代能源之一，具有广泛的应用范围。但是，这种气体在管道运输过程中易燃易爆，容易引起爆炸。为了实现安全传输，通过大型管道实验系统对低浓度气体的爆炸特性和扩散规律进行了系统研究。我们发现，管道中低浓度瓦斯爆炸的峰值压力与传播距离具有二次函数关系。此外，气体爆炸的峰值压力最初从爆炸源开始降低，然后在传播一定距离后出现拐点，随后，气体爆炸的峰值压力急剧增加。爆炸压力在管道出口处达到最大。爆炸火焰的到达时间与传播距离成对数关系，而火焰传播的速度随着传播距离的增加而逐渐增加。火焰在出口处传播更快。另外，管道的直径对低浓度气体的爆炸传播过程也有重要影响。因此，直径越大，爆炸压力越高。DN700管道的爆炸压力明显高于DN500，爆炸压力上升更快。DN700管道中瓦斯爆炸的火焰传播速度也高于DN500管道。

更新日期：2020-02-26

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