不同温度下无烟煤电阻率的层理效应

Effects of bedding plane on anthracite coal resistivity under different temperatures

选取层理面与轴向夹角θ为0°、30°、45°、60°和90°的无烟煤样,采用CHI660E型电化学工作站,在0~95℃温度下测试煤样的I-V曲线,提出串并联主导程度概念,采用最小势能原理和电荷极化原理,分析和研究不同温度下层理结构对电阻率的影响机理及规律.结果表明:无烟煤电阻率随温度升高呈现较强的规律性,当θ为0°时在55℃时出现拐点,其余均在35℃时出现拐点;串并联主导程度解释了层理结构对电阻率的影响机理,由关键层理面的数量和开始通过时间来决定;无烟煤电阻率受层理结构影响显著,随θ增大呈现递增规律;无烟煤各向异性系数随温度升高而增大,在35~65℃范围内,增大近2倍.

This study tested the current vs.voltage curves of coals with angles of 0°,30°,45°,60°,and 90° between the bedding plane and the axial direction at temperatures from 0 to 95 ℃ using a CHI660E electrochemical workstation.The concept of the series-parallel dominant degree was put forward.Moreover,the influence mechanism and the rule of the bedding structure of anthracite coal on coal resistivity under different temperatures were analyzed and investigated using the principle of minimum potential energy and polarization charge.The results show that the resistivity of the anthracite coal exhibits a strong regularity with temperature rise.A turning point appears at 55 ℃ for θ of the 0° samples,whereas the other samples have a turning point at 35 ℃.The series-parallel dominant degree reflects the impact mechanism of the bedding structure on coal resistivity and depends on the number of key bedding surface and the start time of the current going through.The resistivity increases with the increasing θ.In addition,the anisotropy coefficient of the anthracite coal increases with the temperature rise and elevates nearly twice in the scope of 35 to 65 ℃.