甲烷-空气最小点火能与耦合系数的计算及应用

发布时间：2018-12-20 17:32

【摘要】：针对一种可以用于检测非金属制品在矿井下工作安全性的静电火花检测系统,研究了计算该系统中甲烷-空气引爆的最小点火能量的数学物理模型。并根据该检测系统的结构,提出了点火系统点火前后的电磁能量计算方法。通过计算系统点火前的电磁能量与最小点火能量,计算出检测样品被粉尘摩擦后的带电量,得出了点火能量耦合系数阈值与电荷阈值。结果表明,点火能量耦合系数阈值随电压升高而减小,随电极间距的增大而增大。以静电检测系统为例,当电极间距由1mm增大到5mm时,耦合阈值从0.416 3增加到0.769 1。同时,电荷阈值亦随电极间距增大而增大。研究结果可为进一步检测材料摩擦起电属性以及制定相关安全标准提供参考。
[Abstract]:Aiming at an electrostatic spark detection system which can be used to detect the safety of non-metallic products working under a mine, a mathematical and physical model for calculating the minimum ignition energy of methane-air detonation in this system is studied. According to the structure of the detection system, the calculation method of electromagnetic energy before and after ignition is proposed. By calculating the electromagnetic energy and minimum ignition energy of the system before ignition, the electrical energy of the sample after dust friction is calculated, and the threshold of coupling coefficient of ignition energy and the threshold of charge are obtained. The results show that the threshold of ignition energy coupling coefficient decreases with the increase of voltage and increases with the increase of electrode spacing. Taking electrostatic detection system as an example, when the electrode spacing increases from 1mm to 5mm, the coupling threshold increases from 0.416 3 to 0.769 1. At the same time, the charge threshold also increases with the increase of electrode spacing. The results can provide a reference for the further testing of friction starting properties of materials and the establishment of relevant safety standards.
【作者单位】：重庆大学输配电装备及系统安全与新技术国家重点实验室;山东电力公司淄博供电局;
【基金】：国家自然科学基金青年基金(51007096) 国家重点基础研究发展计划(2011CB209401)
【分类号】：TD712

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