Experimental Study on the Impact of Temperature on Coal Electric Parameter

Abstract:

The experiment studied the variation of coal electric parameter using coal electric parameter testing system designed and processed by themselves. Raw coal sample and moulded coal sample were chosen as the study object. Studies have shown that the resistivity of coal sample decreases with increasing temperature. The resistivity of raw coal decreases significantly as the temperature increases, while the extent of decrease in moulded coal small. The dielectric constant of coal body decreases with increasing temperature. At the same temperature, the dielectric constant and the resistivity of moulded coal are both smaller than that of the raw coal. There are some theory and reference value of the experimental results for predicting coal and gas outburst with electromagnetic radiation.

• Periodical: Advanced Materials Research (Volumes 524-527)
• Pages: 431-435
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.524-527.431
• Online since: May 2012
• Authors: Xiang Chun Li, Wen Bo Liu, Bai Sheng Nie, Zhan Jun Li, Yong Jie Wang, Li Li
• Keywords: Coal Body, Dielectric Constant, Resistivity, Temperature

References

[1] He Xueqiu. Coal gas-bearing rock rheological Dynamics[M]. Xuzhou: China University of mining and technology press, 1995.

[2] Wang Yungang. Basic study on microwave radiation rules and its mechanism of loading coal in deformation and fracture process[D]. China University of Mining & Technology,2008.

[3] Xu Longjun, Liu Chenglun, Xian Xuefu. Fractal characteristics of alternating current conductivity of coal[J]. Coal Conversion 2001 ,24(1):50-52.

[4] Xu Hongwu. Testing and research of seam electric parameter[J]. Coal Geology & Exploration, 1996,( 2) :53-56.

[5] Lv Shaolin, He Jishan. Electrical property measurements for the outburst coal mass[J]. Journal of Central south university of technology,1998,12(6):511-513.

[6] Liu Zhentang,Jia Yingmei,Wang Enyuan Et al.. Study on the Change Law of the Resistivity of Coal in the process of Compression[J]. Coal Science and Technology,47-49.

[7] Lu Hailong, Jia Yingmei. Experimental Study on Change Law of Resistivity of Coal under Compressive Load[J]. Mining Research and Development, 2009, 8(4):42-44.

[8] Du Yungui, Xian Xuefu, Tan Xueshu Et al.. Reserach on the Electrical Conductivity of Nantong Coal[J]. Journal of Chongqing University，1995,(2):145-148.

[9] Xu Longjun, Xian Xuefu, Li Xiaohong Et al.. Experimental study on the complex permittivity of coal under alternating electric field[J]. Journal of Chongqing University, 1998,21(3):6-10.

[10] Zhang Liangying, Yao Xi. Dielectric Physics[M]. Xian: Xi'an Jiaotong University Press,1991.

[11] Jin Weifang. Dielectric Physics[M]. Beijing: Mechanical Industry Press,1997.

[12] Zhu Xingshan. The impact of pore characteristics of coal seam on drainage methane[J]. China Coalbed Methane, 1996, 6(1):21-23.