半煤岩巷混合粉尘最低着火温度实验方案
首发时间:2016-12-09
摘要:为有效控制和预防半煤岩巷道在采掘过程中发生煤尘爆炸事故,研究煤岩混合型粉尘的着火特性,提出了测试半煤岩巷混合粉尘云最低着火温度的实验设想,并为之设计了一套实验方案。该实验方案包括实验装置的选用、煤样和岩样的现场采集、混合型粉尘的配制、最低着火温度测试方法和实验结果分析五个部分,并对现有的实验方法进行了改进,提出了运用高速摄像机对混合粉尘引爆过程进行拍摄取代肉眼观察的方法,提高了实验结果的准确度。通过该项实验方案可以得出煤岩混合型粉尘在不同配比下的最低着火温度和其特征曲线,实验结果表明,当混合粉尘中岩粉含量低于40%时,混合粉尘云最低着火温度随岩粉含量的增加变化幅度较小,当混合粉尘中岩粉含量高于40%时,混合粉尘云最低着火温度随岩粉含量的增加而大幅度升高。
关键词: 矿业工程 半煤岩巷道 煤岩混合型粉尘 最低着火温度 煤尘爆炸
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Experimental scheme of minimum ignition temperature of mixed dust in coal and rock roadway
Abstract:The purpose of this study is to control and prevent the explosion accidents occurred during the process of mining in coal and rock roadway effectively, to explore the fire characteristics of mixed coal and rock dust. Come up with an idea for test the minimum ignition temperature of coal and rock mixed dust cloud. Experimental scheme is designed for making sense of the ignition characteristics of mixed dust in coal and rock roadway.The experiment scheme including the choice of experimental apparatus, coal and rock collection, preparation of pulverized coal rock powder, the configuration of the mixed pulverized coal dust and hybrid minimum ignition temperature test.In addition, the existing experimental method has been improved, propose using the High-speed cameras filmed the mixed dust detonation process , instead of the naked eyes.That can improve the accuracy of experimental results. Through the experiments under different ratio of blended coal and rock dust can be drawn from the minimum ignition temperature and the minimum ignition temperature characteristic curve.It reveals that, when the percentage of rock dust content is less than 40%, the mixing of rock powder will slightly impact the minimum ignition temperature of mixed dust cloud. On the other hand, when the percentage of rock powder is higher than 40%, the minimum ignition temperature of mixed dust will increase dramatically with the percentage of rock powder.
Keywords: mineral engineering coal and rock roadway mixed coal and rock dust minimum ignition temperature coal dust explosion
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