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针对矿井瓦斯抽采在PVC管壁电荷积聚产生强静电场而导致静电放电的危害,通过搭建塑性管瓦斯流动静电场测试装置,模拟测试瓦斯流动过程中塑性管道的静电场,同时数值计算静电放电有效点火能量。研究结果表明,改变瓦斯流速、管径和瓦斯浓度,PVC管静电场总体趋势是开始时电场随时间逐渐增大,而后趋于稳定,流动瓦斯与PVC管壁面摩擦产生电荷积聚而导致的静电场可达20 kV/m以上。以甲烷的最小点燃能量0.28 mJ为标准,大多时刻PVC管静电放电有效点火能量小于0.28mJ,处于安全状态,但某些时刻有效点火能量大于0.28 mJ,使得瓦斯处于爆炸的最小点火能量范围。从试验分析瓦斯抽采PVC管静电场及有效点火能量,可为矿井瓦斯抽采防静电措施提供科学依据。
In view of the harm of electrostatic discharge caused by the strong electrostatic field generated by the accumulation of charge in the wall of PVC pipe in gas drainage of mines, the electrostatic field of plastic pipe in gas flow process is simulated by setting up a test device of gas flow electrostatic field in plastic pipe. Simultaneously, Effective ignition energy. The results show that changing the gas flow rate, pipe diameter and gas concentration, the overall trend of the electrostatic field in the PVC pipe is that the electric field increases gradually with time and then tends to be stable. The electrostatic field due to the charge accumulation caused by the friction between the flowing gas and the PVC pipe wall Up to 20 kV / m or more. The minimum ignition energy of methane is 0.28 mJ. Most of the time, the effective ignition energy of PVC tube ESD is less than 0.28 mJ, which is safe. However, the effective ignition energy is greater than 0.28 mJ at some time, so that the gas is at the minimum ignition energy range of explosion. From the experimental analysis of gas drainage PVC pipe electrostatic field and effective ignition energy, it can provide a scientific basis for mine gas drainage anti-static measures.