不同变质程度煤体注水蚀变演化及降尘机制研究  

Study on alteration evolution and dust reduction mechanism of coal with different metamorphic degrees by water injection

作　　者：王刚[1,2] 张晏铭 佟林全 王恩茂 解树亮 梁瀚丹 陆景阳 WANG Gang;ZHANG Yanming;TONG Linquan;WANG Enmao;XIE Shuliang;LIANG Handan;LU Jingyang(l.College of Safety and Environmental Engineering,Shandong University of Science and Technology,Qingdao,Shandong 266590,China;State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology,Shandong University of Science and Technology,Qingdao,Shandong 266590,China;National Center for Occupational Safety and Health,NHC,Beijing 102308,China;Key Laboratory for Engineering Control of Dust Hazard,NHC,Beijing 102308,China)

机构地区：[1]山东科技大学安全与环境工程学院,山东青岛266590 [2]山东科技大学矿山灾害预防控制省部共建国家重点试验室培育基地,山东青岛266590 [3]国家卫生健康委职业安全卫生研究中心,北京102308 [4]国家卫生健康委粉尘危害工程防护重点试验室,北京102308

出　　处：《中国矿业大学学报》2024年第6期1085-1098,共14页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(52174194);山东省自然科学基金杰出青年基金项目(ZR2020JQ22);泰山学者工程(TS20190935)。

摘　　要：为了探究水对煤微观结构的影响和水-煤蚀变演化规律及降尘机制,采用聚焦光谱显微镜、傅里叶红外光谱(FT-IR)、X射线光电子能谱(XPS)、单轴压缩等测试方法,综合分析了乌东煤矿褐煤、高家堡煤矿烟煤和赵固煤矿无烟煤3种不同变质程度煤体浸水蚀变前后煤体表面形貌、力学特性、官能团等特征变化,阐明水-煤蚀变作用对煤体降尘的宏、微观影响规律,揭示不同变质程度煤体注水蚀变演化规律及注水降尘机制.结果表明:蚀变后煤体局部相对塑性形变能力增强,煤体更多的能量用于煤体裂纹闭合和孔隙间的摩擦消耗,此时煤体破碎需要消耗更多的释放能密度U_(f);随着煤体变质程度的提高,极性亲水性含氧官能团占比下降,水-煤蚀变作用减弱,水分子通过黏附力以及表面张力吸附在煤大分子表面,降低了粉尘浓度;水-煤蚀变后,含氧官能团与水分子吸附形成氢键,且吸附距离都在2A之内,氢键作用增强了粉尘颗粒之间的结合强度与黏性,粉尘颗粒结合成更大的团聚体,更易附着在煤体粗糙的表面.In order to explore the effect of water on the microstructure of coal,the evolution law of water-coal alteration and the mechanism of dust reduction,focusing spectrum microscope,fourier transform infrared spectroscopy(FT-IR),X-ray photoelectron spectroscopy(XPS)and uniaxial compression were used.The changes of coal surface morphology,mechanical properties and functional groups before and after water immersion alteration of lignite,Gaojiabu bituminous coal and Zhaogu anthracite in Wudong coal mine were comprehensively analyzed.The macroscopic and microscopic influence of water-coal alteration on coal dust reduction was expounded and the evolution law and dust reduction mechanism of water injection of coal with different metamorphic degrees were revealed.The results show that the local relative plastic deformation ability of coal is enhanced after alteration,and more energy of coal is used for crack closure and friction consumption between pores,and coal fragmentation needs to consume more released energy density U_(f).With the increase of the metamorphic degree of coal,the proportion of polar hydrophilic oxygen-containing functional groups decreases,water-coal alteration weakens,and water molecules are adsorbed on the surface of coal macromolecules through adhesion and surface tension,thus reducing the dust concentration.After water-coal alteration,oxygen-containing functional groups and water molecules are adsorbed to form hydrogen bonds,and the adsorption distances are all within 2A.Hydrogen bonds enhance the bonding strength and stickiness between dust particles,and dust particles combine into larger aggregates,which are easier to adhere to the rough surface of coal.

关 键 词：水-煤蚀变 表面形貌 官能团 力学特性 降尘机制 

分 类 号：X936[环境科学与工程—安全科学]