摘要
为分析不同煤体的电阻率变化规律,通过X射线衍射和矿物元素测定方法研究了芳香结构、矿物质种类、含量对电阻率的影响。结果表明:随煤变质程度的升高,002半峰宽收窄,峰形趋于尖锐,说明芳香片层间距d_(002)逐渐减小,芳香结构的石墨化程度逐渐提高,电阻率则相应下降。芳香片层延展度L_(a)、堆砌高度L_(c)和堆砌芳香片数N随煤级提高也逐渐增大,最终趋于稳定,说明煤结构周边原子集团可能发生脱落,使煤大分子结构表现出高度缩合性和有序性,造成导电性能加强,电阻率降低。不同变质程度煤中矿物元素种类越多,反映离子含量越高,发生离子热运动的可能性增强,其电阻率相应减小。
In order to analyze the changing law of different coal's resistivity,the influence of aromatic structure,mineral type and content on resistivity was studied by X-ray diffraction and mineral element determination methods.The results show as follows.With the increase of coal metamorphism,the half-width of 002 narrows and the peak shape tends to be sharp.The aromatic lamella spacing d_(002) gradually decreases,the graphitization degree of the aromatic structure gradually increases,and the resistivity decreases accordingly.As the coal rank increases,the extension L_(a),the height of fragrant stacking L_(c) and the number of fragrant flakes N also gradually increase and eventually stabilize.It reflects that the surrounding atomic groups of coal structure may fall off,which makes the coal macromolecular structure show high condensation and orderliness,resulting in enhanced electrical conductivity and reduced resistivity.The more types of mineral elements in coal of different metamorphic degrees,the higher the ion content,the greater the possibility of ion thermal movement,and the resistivity decreases accordingly.
作者
郑学召
吴佩利
张铎
童鑫
李腾飞
ZHENG Xue-zhao;WU Pei-li;ZHANG Duo;TONG Xin;LI Teng-fei(College of Safety Science and Engineering, Xi'an University of Science and Technology, Xi'an 710054, China;Xi'an Research Center of National Mine Rescue, Xi'an 710054, China)
出处
《科学技术与工程》
北大核心
2021年第34期14523-14527,共5页
Science Technology and Engineering
基金
国家自然科学基金(52174197,51904234)
陕西省自然科学基础研究计划(2018JQ5080)
陕西省教育厅专项科学研究计划(17JK0495)。
关键词
电阻率
微晶结构
X射线衍射
煤体矿物元素
resistivity
microcrystalline structure
X-ray diffraction
coal mineral elements
作者简介
第一作者:郑学召(1977—),男,汉族,新疆焉耆人,博士,教授,研究方向:矿山应急救援通信与煤火灾害防控,E-mail:zhengxuezhao@xust.edu.cn。
