新型复合封孔材料的密封性能

Sealing performance of new typed composite sealing material

为保障矿井安全生产、增强抽采钻孔密封效果、提高瓦斯抽采浓度,针对传统密封材料封孔效果差、漏气量大、抽采浓度低等缺点,通过对材料本身漏气通道、钻孔周围煤体漏气通道及密封材料-孔壁间隙漏气通道的分析,得出影响漏气量的三项因素。选择新型复合材料和聚氨酯为密封材料进行室内密封性能实验,并进行现场验证。结果表明:复合材料的封堵性能优于聚氨酯,由其密封的钻孔平均瓦斯抽采体积分数比聚氨酯提高75%。该复合材料是一种致密性高、膨胀性高、结合性强的新型无机封孔材料,其瓦斯抽采钻孔密封效果好。

This paper proposes a novel composite sealing material as an improved alternative to conventional sealing material which suffers from disadvantages such as a poor sealing effect, a larger leakage, and a lower extraction in an effort to ensure the safety of mine production, enhance the sealing effect of extraction borehole, and improve the concentration of gas extraction. The research builds on an analysis of the three leakage channels, namely the leakage channel of the material itself, the leakage channel around the coal seam and the gap between the sealing material and the pore wall, identifies the three factors influencing the air leakage, and is validated by an indoor sealing performance test using the new type of composite material and polyurethane as the sealing material, as well as field tests. The study shows that composites boast a better sealing performance than polyurethane and the composite seal provides a 75 % higher average volume of gas extraction than polyurethane. The results demonstrate that the composite material is a new typed inorganic sealing material with a higher compactness, a higher expansibility and a stronger binding and affords a better gas drainage borehole sealing effect.