本煤层固液耦合流体壁式密封技术开发及应用

发布时间：2018-06-27 11:57

本文选题：本煤层 + 固液耦合　；参考：《中国安全生产科学技术》2015年04期

【摘要】：针对本煤层瓦斯抽采钻孔密封性差、封孔长度不够、钻孔形变较大、钻孔及周围煤体漏风严重等造成抽采瓦斯浓度偏低、衰减速度较快及稳定性差等技术难题,基于"固封液-液封气",受限空间膨胀、渗流力学等理论,进行了钻孔及煤体密封技术的实验模拟与现场验证,研究并开发了固液耦合流体壁式密封新技术及设备。研究表明,采用固液耦合流体壁式密封技术可对抽采钻孔及周围煤体裂隙实施动态密封,最终形成粘液、裂隙及钻孔周围煤体相互耦合的立体封面,有效阻止了因抽采负压增大而导致的巷道空气通过钻孔及周围煤体裂隙向抽采钻孔的漏入,使得瓦斯抽采过程浓度稳定,单孔平均浓度提高4~5倍,显著地提高了本煤层瓦斯的抽采效率。
[Abstract]:Aiming at the technical problems of low gas concentration, fast attenuation speed and poor stability due to the poor sealing property of the gas drainage borehole in this coal seam, the insufficient length of the hole sealing hole, the large deformation of the borehole, the serious air leakage of the borehole and the surrounding coal body, etc. Based on the theories of "solid-liquid gas sealing", confined space expansion and seepage mechanics, the experimental simulation and field verification of drilling and coal sealing technology were carried out, and the new technology and equipment of solid-liquid coupled fluid wall seal were studied and developed. The results show that the solid liquid coupled fluid wall sealing technique can be used to seal the extraction borehole and surrounding coal body crack dynamically, and finally form the solid cover with the coupling of mucus, fissure and coal body around the borehole. The leakage of air in roadway caused by the increase of negative pressure in mining is effectively prevented from leaking through the borehole and the surrounding coal body fissure to the drainage borehole, which makes the concentration of gas drainage stable, and the average concentration of single hole increases by 4 times, and the average concentration of the single hole increases by 5 times. The efficiency of gas drainage in this coal seam is improved significantly.
【作者单位】：辽宁工程技术大学安全科学与工程学院;辽宁工程技术大学矿业学院;辽宁工程技术大学矿业技术学院;中国矿业大学安全工程学院;
【基金】：国家自然科学基金资助项目(51304112)
【分类号】：TD712.6

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