Effects of bedding plane on anthracite coal resistivity under different temperatures
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摘要: 選取層理面與軸向夾角θ為0°、30°、45°、60°和90°的無煙煤樣,采用CHI660E型電化學工作站,在0~95℃溫度下測試煤樣的I-V曲線,提出串并聯主導程度概念,采用最小勢能原理和電荷極化原理,分析和研究不同溫度下層理結構對電阻率的影響機理及規律.結果表明:無煙煤電阻率隨溫度升高呈現較強的規律性,當θ為0°時在55℃時出現拐點,其余均在35℃時出現拐點;串并聯主導程度解釋了層理結構對電阻率的影響機理,由關鍵層理面的數量和開始通過時間來決定;無煙煤電阻率受層理結構影響顯著,隨θ增大呈現遞增規律;無煙煤各向異性系數隨溫度升高而增大,在35~65℃范圍內,增大近2倍.Abstract: 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℃.
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參考文獻
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