Abstract
In the environments of various open coal storage sites, mining-affected coalbeds, and goafs, etc., some coal bodies are often affected by external environmental factors. They are highly prone to spontaneous combustion in low moisture content (≤8%). In order to examine the effect of low moisture content on the spontaneous combustion tendency of coals with different metamorphic grade, we conducted a temperature programmed oxidation (TPO) experiment and differential scanning calorimetry (DSC) experiment to study the spontaneous combustion characteristics of coals with different metamorphic grade at four different low moisture contents. The change laws of the characteristic parameters of four different metamorphic grade coals at four different low moisture contents were comparatively analyzed. The experimental results indicate that: (1) Compared other low moisture content, anthracite and fat coal at a low moisture content of 1.2 % show a stronger tendency for spontaneous combustion, and long flame coal and lignite at a low moisture content of 3.4% and 5.6% are more prone to spontaneous combustion. (2) Four different metamorphic grade coals at a low moisture content of 7.8% are less prone to spontaneous combustion.
Highlights
Among many influencing factors of coal spontaneous combustion, it is widely recognized that moisture plays an important role [1,2,3,4]
The different metamorphic grade of the collected coal samples was ranked in a descending order as follows: anthracite from Changcun Coal Mine, Shanxi Province, China; fat coal from Tangshan as follows: anthracite from Changcun Coal Mine, Shanxi Province, China; fat coal from Tangshan
The results indicate in the low moisture content the decrease in the overall heat of release amount of the coal
Summary
Among many influencing factors of coal spontaneous combustion, it is widely recognized that moisture plays an important role [1,2,3,4]. Underground, moisture in orebody and surrounding rock seepage channels could evaporate due to roadway ventilation, airflow, or geological factors, especially under the influence of mining. After coal is immersed in moisture at the goaf, the moisture may gradually reduce due to the influence of long-term air leakage. In these environments, some coal will be in the low moisture content state [8]
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