Pore Structure evolution and fractal analysis of Shenhua non-caking coal during low-temperature oxidation. Issue 3 (14th September 2022)

• Record Type: Journal Article
• Authors: Fan, Lulu; Meng, Xianliang; Zhao, Jianqiao; Tang, Ludeng; Chu, Ruizhi; Li, Weisong; Wu, Guoguang; Jiang, Xiaofeng; Miao, Zhenyong
• Is Part Of: Energy sources. Volume 44:Issue 3(2022)
• Page Start: 6856
• Page End: 6867
• Publication Date: 2022-09-14
• Subjects: low-temperature oxidation -- low-rank coal -- pore structure -- fractal dimension -- evolution mechanism; Natural resources -- Periodicals; Energy consumption -- Periodicals; Energy consumption -- Climatic factors -- Periodicals; Energy conversion -- Periodicals; Energy conversion -- Environment aspects -- Periodicals; Power (Mechanics) -- Periodicals; 333.7905
• DOI: 10.1080/15567036.2022.2103213
• Languages: English
• ISSNs: 1556-7036

Abstract

ABSTRACT: Revealing the evolution of pore structure during low-temperature oxidation is important for the deep-going understanding of coal spontaneous combustion disasters. For this purpose, the pore structure parameters and fractal dimension of Shenhua bituminous coal during low-temperature oxidation were examined by low-temperature nitrogen adsorption and mercury intrusion porosimetry. With the enhancement of oxidation degree, the pore connectivity increased, but the pore volume decreased, especially micropores, which decrease by 79.08%. In the two fractal dimensions, D1 increases from 2.684 to 2.924 while D2 decreases from 2.686 to 2.481, indicating that the pores have a rougher surface and a less heterogenous structure after low-temperature oxidation. An exponential characteristic is observed between the comprehensive fractal dimension and the gas yield. At last, a pore structure evolution mechanism was proposed, dividing the evolution into two stages: collapse of micropores and merging of micropores and transition pores. The research findings in this paper will lay the foundation for understanding the mass transfer in the low-temperature oxidation process.