煤体瓦斯放散磁场响应特征

发布时间：2018-08-22 19:54

【摘要】：针对含煤体瓦斯放散磁效应特性,建立瓦斯放散磁效应实验系统,测试磁化与未磁化煤样瓦斯放散过程,研究恒定磁场对煤样放散瓦斯的影响。实验结果表明:放散初速度较小(f值越大),磁化后煤样瓦斯放散有明显减小趋势;放散初速度越大(f值越小),磁化后煤样瓦斯放散略有增大的趋势;且两者的变化程度都受磁化时间的影响,在撤掉磁场时Δp并未回落至初始值,并保持一定的时间记忆效应。其机理是f值大的煤样,磁化后b值减小,随着压力的升高,磁化后煤样的表面能降低值都小于未磁化的煤样,说明在加磁后煤体吸附容纳瓦斯的空间减少使得吸附量减少,产生的瞬时瓦斯压力梯度降低,从而使得瓦斯的放散初速度降低,而对于坚固性系数f值小的煤样有相反的实验结果。
[Abstract]:According to the characteristics of gas release magnetic effect of coal body, an experimental system of gas release magnetic effect was established to test the process of gas emission from magnetized and unmagnetized coal samples, and to study the effect of constant magnetic field on the gas emission from coal sample. The experimental results show that the lower the initial velocity (the larger the f value), the smaller the gas emission of coal sample after magnetization, the larger the initial velocity (f value is smaller), the greater the gas emission of coal sample is after magnetization. Both of them are affected by the magnetization time, 螖 p does not decrease to the initial value when the magnetic field is removed, and maintains a certain time memory effect. The mechanism is that the coal sample with large f value decreases b value after magnetization. With the increase of pressure, the decrease value of surface energy of magnetized coal sample is smaller than that of unmagnetized coal sample. The instantaneous gas pressure gradient is reduced, which results in the decrease of the initial velocity of gas release, and the contrary experimental results are obtained for the coal samples with low coefficient of solidity (f).
【作者单位】：河南理工大学河南省瓦斯地质与瓦斯治理重点实验室—省部共建国家重点实验室培育基地;中国矿业大学煤炭资源与安全开采国家重点实验室;中原经济区煤层(页岩)气河南省协同创新中心;
【基金】：国家“十二五”科技重大专项课题项目(2011ZX05040-005) 煤炭资源与安全开采国家重点实验室开放课题(SKLCRSM14KFB11) 河南省高校基本科研业务费专项资金资助(NSFRF140104) 河南省教育厅科学技术重点研究项目(14A440008)~~
【分类号】：TD713

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