基于压汞法的赵庄矿不同煤体结构煤的孔隙特征研究
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摘要
选取赵庄矿3号煤层4种不同煤体结构煤的煤样,采用压汞法研究分析其煤体孔隙特征。实验表明,随着煤体破坏程度的增大,大孔孔容占比呈下降趋势,中孔、小孔孔容占比呈上升趋势,煤岩渗透性随之减小。原生结构煤、碎裂煤存在相当数量的封闭孔或孔径在纳米级以下,孔隙连通性差;碎粒结构煤孔隙连通性稍好,退汞效率在4种煤体结构中最高。
Four kinds of coal samples with different coal body structure of No.3 coal seam in Zhaozhuang Coal Mine were selected to analyze the coal pore characteristics by way of mercury intrusion porosimetry.The experiment showed that with the increase of destruction degree of coal body,the capacity ratio of macropore was decreasing,the capacity ratio of mesopore and micropore were increasing,and the permeability of coal decreased.The primary structural coal and cataclysmic coal have a considerable number of closed pores or pore sizes below the nanometer level,and its pore connectivity was poor.The pore connectivity of crushed coal was slightly better,and the mercury removal efficiency was the highest among the four coal structures.
Four kinds of coal samples with different coal body structure of No.3 coal seam in Zhaozhuang Coal Mine were selected to analyze the coal pore characteristics by way of mercury intrusion porosimetry.The experiment showed that with the increase of destruction degree of coal body,the capacity ratio of macropore was decreasing,the capacity ratio of mesopore and micropore were increasing,and the permeability of coal decreased.The primary structural coal and cataclysmic coal have a considerable number of closed pores or pore sizes below the nanometer level,and its pore connectivity was poor.The pore connectivity of crushed coal was slightly better,and the mercury removal efficiency was the highest among the four coal structures.
引文
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[2] 边强,白刚,张潇文.高阶煤孔隙特性及对吸附气体影响的研究[J].山西焦煤科技,2018(7):18-23.Bian Qiang,Bai Gang,Zhang Xiaowen.Research on high grade coal pore property and influence on adsorption gas[J].Shanxi Coking Coal Science and Technology,2018(7):18-23.
[3] 戚灵灵,王兆丰,杨宏民,等.基于低温液氮吸附法和压汞法的煤样孔隙研究[J].煤炭科学技术,2012,40(8):36-39.Qi Lingling,Wang Zhaofeng,Yang Hongmin,et al.Study on porosity of coal samples based on low temperature nitrogen adsorption method and mercury porosimetry[J].Coal Science and Technology,2012,40(8):36-39.
[4] 顾熠凡,王兆丰,戚灵灵.基于压汞法的软、硬煤孔隙结构差异性研究[J].煤炭科学技术,2016,44(4):64-67.Gu Yifan,Wang Zhaofeng,Qi Lingling.Study on porous structure difference of soft coal and hard coal based on mercury intrusion method[J].Coal Science and Technology,2016,44(4):64-67.
[5] 赵迪斐,郭英海,毛潇潇,等.基于压汞、氮气吸附与FE-SEM的无烟煤微纳米孔特征[J].煤炭学报,2017,42(6):1517-1526.Zhao Difei,Guo Yinghai,Mao Xiaoxiao,et al.Characteristics of macro-nanopores in anthracite coal based on mercury injection,nitrogen adsorption and FE-SEM[J].Journal of China Coal Society,2017,42(6):1517-1526.
[6] 张召召,潘结南,李猛,等.基于压汞和低温液氮吸附联合实验的不同变质程度煤全孔隙结构特征研究[J].煤矿安全,2018,49(4):25-29.Zhang Zhaozhao,Pan Jienan,Li Meng,et al.Total pore structure characteristics of coal with different metamorphic degree based on joint experiment of mercury intrusion and low temperature nitrogen adsorption[J].Safety in Coal Mines,2018,49(4):25-29.
[7] 陈悦,李东旭.压汞法测定材料孔结构的误差分析[J].硅酸盐通报,2006,25(4):198-201.Chen Yue,Li Dongxu.Analysis of error for pore structure of porous materials measured by MIP[J].Bulletin of the Chinese Ceramic Society,2006,25(4):198-201.
[8] 孟召平,刘珊珊,王宝玉,等.不同煤体结构煤的吸附性能及其孔隙结构特征[J].煤炭学报,2015,40(8):1865-1870.Meng Zhaoping,Liu Shanshan,Wang Baoyu,et al.Adsorption capacity and its pore structure of coals with different coal body structure[J].Journal of China Coal Society,2015,40(8):1865-1870.
[9] 宋世钊,王佑安.煤与瓦斯突出[M]北京:中国工业出版社,1966.
[10] 林海飞,卜婧婷,严敏,等.中低阶煤孔隙结构特征的氮吸附法和压汞法联合分析[J].西安科技大学学报,2019(1):1-8.Lin Haifei,Bu Jingting,Yan Min,et al.Joint analysis of pore structure characteristics of middle and low rank coal with nitrogen adsorption and mercury intrusion method[J].Journal of Xi′an University of Science and Technology,2019(1):1-8.
[11] 宋播艺,宋党育,李春辉,等.基于压汞法探究岩浆侵入对煤孔隙的影响[J].煤田地质与勘探,2017,45(3):7-12.Song Boyi,Song Dangyu,Li Chunhui,et al.Influence of magmatic intrusion on the coal pore on the basis of mercury intrusion porosimetry[J].Coal Geology & Exploration,2017,45(3):7-12.
[12] 张小东,苗书雷,王勃,等.煤体结构差异的孔隙响应及其控制机理[J].河南理工大学学报(自然科学版),2013(2):125-130.Zhang Xiaodong,Miao Shulei,Wang Bo,et al.Pores response of structural difference of coal body and its influence mechanism[J].Journal of Henan Polytechnic University(Natural Science),2013(2):125-130.