低阶煤层中CO渗透率特性规律研究  

Research on characteristics of CO permeability in low rank coal seam

作　　者：王月红 关雅洁 张九零 林建广[3] 

机构地区：[1]华北理工大学矿业工程学院,河北唐山063009 [2]河北省矿山开发与安全技术重点实验室,河北唐山063009 [3]河北钢铁集团矿业有限公司,河北唐山063000

出　　处：《煤炭工程》2018年第1期128-131,136,共5页Coal Engineering

基　　金：国家自然科学基金项目(51504077;51404086);河北省自然科学基金资助项目(E2016209056);河北省科技计划项目(15274112)

摘　　要：基于林南仓矿CO超标对井下自然发火预报体系造成威胁,提出了从煤的微观结构和外界环境条件两大方面对CO渗流规律进行研究。结果表明:低变质程度煤在不同外界条件下煤层中CO的渗透率远远小于瓦斯的渗透率,但二者随气体压力变化趋势大体一致,并且都对温度较敏感;当外界围压较小时,随着温度的升高CO渗透率下降,并随着围压的升高,CO渗透率影响逐渐减弱。当围压大于3.0MPa时,低阶煤中孔隙受到严重破坏,大孔结构消失,CO渗透率停止减小,几乎不受外界条件变化的影响,最后由主成份分析法和SPSS软件对煤层中CO渗透率影响因素进行权重分析,得到2个主要影响因素,分别为孔隙率和围压。Based on the fact that CO over-run in Linnancang Coal Mine poses a threat to the underground natural fire prediction system,we study the CO seepage law from microstructure and external environmental conditions of coal. The results show that the permeability of CO in coal seam with low metamorphic degree is far less than that of gas under different external conditions,but both of them are generally consistent with the changes of gas pressure and are sensitive to temperature. When the confining pressure is small,the permeability of CO decreased with the increase of temperature,and with the increase of confining pressure,the influence of CO permeability gradually weakens. When the confining pressure is more than 3. 0 MPa,the porosity of low-rank coal is severely damaged,the macro-pore structure disappears and the permeability of CO ceases to decrease,and it is hardly affected by the change of external conditions. Finally,the main factors for the permeability of CO in coal seam are analyzed by the principal component analysis and SPSS software,obtaining two main influencing factors,porosity and confining pressure.

关 键 词：低阶煤 渗透率 围压 孔隙率 权重分析 

分 类 号：TD75[矿业工程—矿井通风与安全]