煤基多孔碳孔隙逾渗演化过程及结构特征

doi:10.12034/j.issn.1009-606X.217120

过程工程学报 ›› 2017, Vol. 17 ›› Issue (5): 989-994.DOI: 10.12034/j.issn.1009-606X.217120

煤基多孔碳孔隙逾渗演化过程及结构特征

王启立^1*，何敏2，李小川¹，刘颀³

1. 中国矿业大学化工学院，江苏徐州 221116；2. 徐州工程学院机电学院，江苏徐州 221008；3. 中国矿业大学电力学院，江苏徐州 221116

收稿日期:2017-01-19 修回日期:2017-03-06 出版日期:2017-10-20 发布日期:2017-10-10
通讯作者: 王启立 wqlcumt@126.com
基金资助:
热质耦合作用下高纯石墨孔隙成孔机理及结构表征;煤炭资源高效洁净加工理论与应用研究;硅晶生长还原炉内石墨组件优化及石墨废料回收利用;硅晶生长用高纯石墨制备技术创新与新型石墨组件研究

Percolation Evolution and Structure Characterization for Coal-based Porous Carbon

Qili WANG¹^*, Min HE², Xiaochuan LI¹, Qi LIU³

1. School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China;
2. School of Mechanical and Electrical Engineering, Xuzhou Institute of Technology, Xuzhou, Jiangsu 221008, China;
3. School of Electric Power Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China

Received:2017-01-19 Revised:2017-03-06 Online:2017-10-20 Published:2017-10-10

摘要/Abstract

摘要： 以煤焦颗粒和煤沥青为原料制备多孔碳材料，从多孔介质流体力学角度分析了坯料焙烧成孔过程及孔隙演化过程，结合分形理论和压汞实验结果，表征了多孔碳孔隙结构的非均质特征. 结果表明，多孔碳坯料焙烧成孔的流体力学本质是挥发分在多孔介质中的流动，伴随焙烧各阶段经历了孔隙产生-逐步增多-局部连通-全部连通-网状联接的逾渗演化过程. 各试样的孔隙度为29.67%?36.59%，比表面积为2.32?3.91 m2/g，骨架面积分形维数为1.788?1.854，孔隙面积分形维数为1.638?1.732，体积分形维数为2.844?2.949，迂曲度分形维数为1.319?1.386，压汞实验中阈值压力为(8.94?13.08)?104 Pa，表现出典型的分形和逾渗特征.

关键词: 多孔碳, 逾渗演化, 孔隙结构, 分形特征

Abstract: The porous carbon was prepared using coal char particles and coal tar as raw materials, and the roasting process of green body of carbon was analysed from the perspective of fluid mechanics of porous media. The evolution process of pores of porous carbon during the forming process in roasting was developed, and the heterogeneous characteristics of pore structure were demonstrated by fractal theory and mercury intrusion test. The results showed that the hydrodynamic nature of the roasting process for carbon blank is the flow of the volatile in porous media. With the various stages of the roasting process, the percolation evolution process of the pore structure is developed from the emergence of the pores, local area and finite clusters to global material and infinite clusters. The volume porosity range from 29.67% to 36.59%, the specific surface area range from 2.32?3.91 m2/g, the area fractal dimensions of skeleton range from 1.788 to 1.854, the area fractal dimensions of pores range from 1.638 to 1.732, the volume fractal dimensions range from 2.844 to 2.949, the fractal dimensions of tortuosity range from 1.319 to 1.386, the percolation threshold in mercury intrusion test range (8.94?13.08)?104 Pa, respectively. Consequently, the fractal and percolation characteristics of porous carbon are clearly demonstrated.

Key words: porous graphite, percolation evolution, porous structure, fractal charceristics

王启立何敏李小川刘颀. 煤基多孔碳孔隙逾渗演化过程及结构特征[J]. 过程工程学报, 2017, 17(5): 989-994.

Qili WANG Min HE Xiaochuan LI Qi LIU. Percolation Evolution and Structure Characterization for Coal-based Porous Carbon[J]. Chin. J. Process Eng., 2017, 17(5): 989-994.

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煤基多孔碳孔隙逾渗演化过程及结构特征

Percolation Evolution and Structure Characterization for Coal-based Porous Carbon

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