摘要
为核定低煤阶镜煤和暗煤的润湿性及主要控制因素,采集大佛寺4^(#)煤样品并剥离出镜煤和暗煤,进行显微组分分析、工业分析、接触角测定、吸水速率测定、核磁共振测试,并测定不同温度水热处理后样品工业组分、元素含量,分析水热处理煤的分子结构变化,明确镜煤和暗煤的润湿性差异及主要控制因素。结果表明大佛寺4^(#)煤镜煤相较于暗煤,镜质组、壳质组含量高,挥发分、水分高,而惰质组、矿物质含量低、灰分低,并且H、O含量较高。镜煤和暗煤均表现亲水性,但暗煤的灰分更高,润湿性更好,自由水/结合水呈过渡态,灰分是影响大佛寺4^(#)煤润湿性的关键因素。水热处理温度增高,煤的灰分、水分、挥发分皆下降,H/C变化不大,O/C降低。煤的低温水热提质本质是减弱煤分子间二级结构的缔合作用,促进灰分重力沉降和羟基等含氧官能团分解脱除,增强煤的疏水性。
The coal samples are collected from No.4 coal seam in Dafosi coal mine for the verification of wettability and its main influence factors of low-rank vitrain and durain coal.Based on the experimental data of maceral analysis,proximate analysis,contact angle measurement,water absorption,nuclear magnetic resonance test,and hydrothermal treatment with different temperatures,the changes of molecular structure of coal after hydrothermal treatment are examined,with the wettability difference and its main influence factors of vitrain and durain defined.The results show that compared with the durain,the vitrain has a higher content of vitrinite,exinite,volatiles,moisture and element H and O,and lower content of minerals and ash.Both the vitrain and durain coal are hydrophilic,while the durain coal has higher ash content and better wettability,and its free water and combined water are in a transitional state.Ash content is a key factor affecting the wettability of No.4 coal in Dafosi area.When the temperature of hydrothermal treatment increases,the content of ash,moisture and volatiles of coal decreases,while H/C has little change and O/C decreases.The essence of low-temperature hydrothermal treatment of coal is to weaken the association of secondary structures between coal molecules,promote the ash gravity settlement and the decomposition and removal of oxygen-containing functional groups such as hydroxyl,thus enhancing the hydrophobicity of coal.
作者
刘巧妮
刘钰辉
LIU Qiaoni;LIU Yuhui(Shaanxi Coal Geology Group Co. ,Ltd. ,Xi’ an 710010,China;Shaanxi Ecological Industry Co. ,Ltd. ,Xi’ an 710061,China;College of Water Resources and Hydro-electric Engineering,Xi’an University of Technology,Xi’ an 710048,China)
出处
《西安科技大学学报》
CAS
北大核心
2021年第1期112-120,共9页
Journal of Xi’an University of Science and Technology
基金
陕西省自然科学基础研究计划项目(2018JQ2044)。
关键词
大佛寺
镜煤
暗煤
水热处理
煤质
润湿性
核磁共振
Dafosi
vitrain
durain
hydrothermal treatment
coal quality
wettability
nuclear magnetic resonance
作者简介
通信作者:刘巧妮,女,陕西西安人,工程师,E-mail:liuqiaoni0122@126.com。
