Spontaneous combustion characteristics and infrared analysis of soaked lignite

doi:10.16265/j.cnki.issn1003-3033.2018.08.018

Abstract

Abstract: In order to prevent self-igniting fire caused by soaking of residual coal in goaf,lignite samples and soaked coal samples were prepared,and temperature programmed experiments were carried out to study the change of the spontaneous combustion characteristics.FT-IR spectra of the coal samples were obtained,and the influences of soaking on the functional groups of coal were quantitatively analyzed.The results show that the temperature of the end point of water evaporation,the ignition temperature and the temperature corresponding to the maximum weight loss rate of the soaked coal sample are advanced in varying degree,and the ignition activation energy is reduced by 11.2%,indicating that the soaked lignite is more prone to spontaneous combustion,and the contents of alkyl ether,aryl ether,methylene and self associative hydroxyl hydrogen bond in the coal are increased,and the oxidation activity of coal are enhanced after soaking.

Key words: soaking, lignite, Fourier transform infrared (FT-IR) spectrum, spontaneous combustion characteristics, coal structure

CLC Number:

X936

DENG Cunbao, QIAO Ling, WANG Xuefeng, DAI Fengwei, ZHANG Xun. Spontaneous combustion characteristics and infrared analysis of soaked lignite[J]. China Safety Science Journal, 2018, 28(8): 105-110.

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