[1]郑学召,赵 炬,张 铎,等.不同变质程度煤介电常数特性[J].西安科技大学学报,2019,(03):469-474.[doi:10.13800/j.cnki.xakjdxxb.2019.0312]
 ZHENG Xue-zhao,ZHAO Ju,ZHANG Duo,et al.Dielectric constant characteristics of different metamorphic coals[J].Journal of Xi'an University of Science and Technology,2019,(03):469-474.[doi:10.13800/j.cnki.xakjdxxb.2019.0312]





Dielectric constant characteristics of different metamorphic coals
郑学召12赵 炬12张 铎12郭 军12
(1.西安科技大学 安全科学与工程学院,陕西 西安 710054; 2.国家矿山应急救援西安研究中心,陕西 西安 710054)
ZHENG Xue-zhao12ZHAO Ju12ZHANG Duo12GUO Jun12
(1.College of Safety Science and Engineering,Xi'an University of Science and Technology,Xi'an 710054,China; 2.Xi'an Research Center of State Mine Emergency Rescue,Xi'an 710054,China)
介电常数 宽带介电谱测试 工业分析 煤变质程度 测试频率
dielectric constant broadband dielectric spectrum test proximate analysis coalmetamorphism measurement frequency
TD 76
为了研究煤的介电常数随变质程度与测试频率之间的关系,通过Concept 80宽带介电谱测试系统测试在0.1~1.0 GHz频段范围内褐煤、长焰煤、气煤、贫瘦煤和无烟煤的介电常数。结果表明:不同变质程度煤的介电常数随测试频率的增加先减小后增加,测试频率在0.3 GHz左右时介电常数值最小,在1.0 GHz附近介电常数值最大; 同一测试频率下,贫瘦煤的介电常数最大,依次为褐煤、气煤、长焰煤,无烟煤的介电常数最小。此外,通过5E-MAG6700全自动工业分析仪来研究煤介电常数随变质程度的内在因素,可以发现,煤的水分含量、含碳量和灰分含量对其介电常数有一定的影响,但不是决定因素,以上结论对于超宽带电磁波在煤层中传播的实验频段选择和对井下被困人员超宽带雷达生命信息钻孔探测具有一定指导意义。
In order to study the relationship between the permittivity of coal with the degree of deterioration and the test frequency,the permittivity of lignite,long-flame coal,gas coal,lean coal and anthracite in the range of 0.1~1.0 GHz frequency range were tested with the Concept 80 Broadband Dielectric Spectrum Test System.The results show that the permittivity decreases first and then increases with the increase of test frequency.When the test frequency is around 0.3 GHz,the dielectric constant value is the lowest,and the dielectric constant value is the highest around 1.0 GHz.At the same test frequency,the permittivity of lean coal was the largest,followed by lignite,gas coal and long flame coal,and the permittivity of anthracite was the smallest.In addition,through the 5e-mag 6700 full-automatic industrial analyzer,the internal factors of the coal permittivity with the degree of deterioration are studied.According to the industrial analysis,the moisture content,carbon content and ash content of the coal have certain influence on the permittivity,but it was not the decisive factor.This conclusion has certain guiding significance for the selection of experimental frequency band of electromagnetic wave propagation in coal seam and for the borehole detection of UWB radar life information of downhole people trapped.


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收稿日期:2018-07-22 责任编辑:刘 洁 基金项目:国家重点研发计划重点专项(2018YFC0808201); 陕西省自然基金(2018JM5009,2018JQ5080); 陕西省教育厅专项科学研究计划(17JK0495) 通信作者:郑学召(1977-),男,新疆焉耆人,博士,副教授,E-mail: zhengxuezhao@xust.edu.cn 郑学召,赵 炬,张 铎,等.不同变质程度煤介电常数特性[J].西安科技大学学报,2019,39(3):469-474. ZHENG Xue-zhao,ZHAO Ju,ZHANG Duo,et al.Dielectric constant characteristics of different metamorphic coals[J].Journal of Xi'an University of Science and Technology,2019,39(3):469-474.
更新日期/Last Update: 2019-05-30