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为探讨升温煤体受限空间气体的变化规律,设计加工升温煤体引爆瓦斯试验平台,针对不同初始CH4体积分数开展受限空间煤体升温试验。利用Matlab计算试验数据,绘制O2,N2,CO,CH4,C2H4,C2H2的体积分数变化规律曲线。基于可燃性气体爆炸极限理论和计算公式,计算可燃性气体体积分数与混合气的爆炸上下限值,并绘制其关系图。结果显示,当温度为190~400℃时,受限空间气体将失去爆炸性。分析现场煤自燃引爆瓦斯的条件和形式,提出防治煤自燃引爆瓦斯的重点是防止煤柱、断层和高冒煤自燃升温到更高温度,尤其是要防止该区域提前氧化升温,同时要保持工作面风流稳定。
In order to explore the variation law of the gas in the limited space of coal, the gas test platform for designing and processing the coal body to detonate was designed, and the coal space temperature rise test was carried out in the limited space for different initial CH4 volume fraction. The experimental data were calculated by Matlab and the curve of the volume fraction of O2, N2, CO, CH4, C2H4 and C2H2 was plotted. Based on the explosion limit theory and calculation formula of flammable gas, the upper and lower explosion limits of flammable gas volume fraction and mixed gas are calculated and their relations are plotted. The results show that the gas in the confined space will lose its explosiveness when the temperature is between 190 and 400 ℃. This paper analyzes the conditions and forms of spontaneous combustion of spontaneous combustion gas and puts forward that the key point to prevent gas spontaneous combustion is to prevent coal pillars, faults and spontaneous combustion of coal spontaneous combustion from rising to a higher temperature. In particular, it is necessary to prevent the area from oxidizing in advance and keep working Strange and steady.