Abstract
The low-temperature oxidation law of coal and rock mass is the basis to study spontaneous combustion in goafs. In this paper, the low-temperature oxidation laws of coal, oil shale, and mixtures of coal and oil shale were studied by using laboratory programmed heating experiments combined with a field beam tube monitoring system. The results from the programmed heating experiments showed that the heat released from oil shale was less than that from coal. Coal had a lower carbon monoxide (CO)-producing temperature than oil shale, and the mixture showed obvious inhibiting effects on CO production with an average CO concentration of about 38% of that for coal. Index gases were selected in different stages to determine the critical turning point temperature for each stage. The field beam tube monitoring system showed that the temperature field of the 1105 co-mining face of coal and oil shale in the goaf of the Liangjia Coal Mine presented a ladder-like distribution, and CO concentration was the highest for coal and lower for the mixture of coal and oil shale, indicating that the mixture of coal with oil shale had an inhibiting effect on CO production, consistent with the results from the programmed heating experiments.
Highlights
Mine fires are among the most dangerous disasters that affect a safe production in mines.After mining the working face, the empty space of the mined coal is defined as goaf, where residual coal is continuously oxidized in the goaf, with flammable gas released and temperature increased, which can potentially lead to fire in the goaf
When the selected coal and oil shale samples were at the initial low-temperature oxidation stage in the programmed heating experiment, the three tested samples were all at a slow oxidation stage, with the temperature rise rate lower than that set in the programmed heating experiment, and their temperatures were lower than the oven temperature
Through the field beam tube monitoring system in the goaf, it was found that the temperature at various measuring points never exceeded 38 ◦ C, which corresponds to the low-temperature oxidation in the programmed heating experiment
Summary
Mine fires are among the most dangerous disasters that affect a safe production in mines. After mining the working face, the empty space of the mined coal is defined as goaf, where residual coal is continuously oxidized in the goaf, with flammable gas released and temperature increased, which can potentially lead to fire in the goaf. The prevention of fire in goafs is of great significance for a safe production in mines. The Liangjia Coal Mine is located in Longkou City of Shandong Province in China, as shown in. 7. The 1105 working face was designed for mining theShandong seam of Coal Oil shale. Coal located in an Longkou City of Shandong Province
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