煤的低温氮气吸附多尺度孔隙结构特征与分形分析Multiscale Pore Structure Characteristics and Multifractal Analysis of Coal via Low-Temperature Nitrogen Adsorption
赵成栋,李金财,李元吉,张强,代诚欣,戴宇祥
摘要(Abstract):
为明确煤阶与颗粒尺度对煤孔隙结构非均质性的协同控制机制,选取褐煤、烟煤与无烟煤,并制备5~10目、10~20目和20~40目三种颗粒样品,采用低温氮气吸附实验结合多分形理论进行分析。结果表明:随煤阶升高,孔隙结构由褐煤的狭缝孔(Ⅳ型等温线,H3型滞后环)向无烟煤的“墨水瓶”孔(近Ⅱ型等温线,H2型滞后环)转变,孔隙连通性下降,但能量非均质性总体增强,无烟煤奇点谱宽度Δα整体处于较高水平(2.79~2.83)。颗粒尺度的影响具有煤阶依赖性:褐煤细化使系统趋于均质(Δα下降17.6%);烟煤适度破碎加剧异质性(Δα上升3.5%);无烟煤孔隙参数对破碎不敏感。多分形参数(D_q、f(α))有效量化了孔隙表面能量分布,揭示了煤阶(TOC、灰分)与颗粒尺度对孔隙结构的协同调控作用。
关键词(KeyWords): 低温氮气吸附;煤阶;分形维数;多分形谱;孔隙连通性;表面能;颗粒尺度;非均质性
基金项目(Foundation): 黑龙江省优秀青年教师基础研究支持计划(YQJH2024215);; 黑龙江省省属本科高校基本科研业务费项目(2024-KYYWF-1090);; 黑龙江省博士后科研启动金项目(2023BSH14)
作者(Author): 赵成栋,李金财,李元吉,张强,代诚欣,戴宇祥
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