TY - JOUR
T1 - Combustion Characteristics of Coal Dust Containing Oil in the Oxygen-enriched Environment
AU - Shao, Hao
AU - Lu, Qingzi
AU - Bhattacharyya, Sekhar
AU - Jiang, Shuguang
N1 - Funding Information:
This work is supported by the Fundamental Research Funds for the Central Universities (2018GF12), the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
Publisher Copyright:
© 2020 Taylor & Francis Group, LLC.
PY - 2022
Y1 - 2022
N2 - An oily coal dust that is difficult to remove is easily formed on the surface of coal mining equipment. However, high-power equipment generates a higher surface temperature, which can promote spontaneous combustion of coal, especially in the oxygen-enriched environment of the refuge chamber. This study investigated the effects of lubricating oil on coal spontaneous combustion under different oxygen concentrations using a temperature-programmed experiment, Fourier transform infrared spectroscopy and thermogravimetry-differential scanning calorimetry. The results show that the activation energy is inversely proportional to the lubricating oil content during the low-temperature oxidation stage. With a mass ratio of coal to lubricating oil of 2:1, compared with raw coal, the activation energy was reduced by 6.46 KJ/mol. With a higher lubricating oil content of coal and an increased oxygen concentration, the absorption peak intensities of -CH3, -CH2, -OH were lower and the C-O absorption peak intensity was higher. Therefore, lubricating oil promotes coal spontaneous combustion and the promoting effect is proportional to the lubricating oil content and oxygen concentration. Furthermore, the difference in heat released indicates that the effect of lubricating oil on coal spontaneous combustion is the result of the interaction between coal oxidation and lubricating oil oxidation.
AB - An oily coal dust that is difficult to remove is easily formed on the surface of coal mining equipment. However, high-power equipment generates a higher surface temperature, which can promote spontaneous combustion of coal, especially in the oxygen-enriched environment of the refuge chamber. This study investigated the effects of lubricating oil on coal spontaneous combustion under different oxygen concentrations using a temperature-programmed experiment, Fourier transform infrared spectroscopy and thermogravimetry-differential scanning calorimetry. The results show that the activation energy is inversely proportional to the lubricating oil content during the low-temperature oxidation stage. With a mass ratio of coal to lubricating oil of 2:1, compared with raw coal, the activation energy was reduced by 6.46 KJ/mol. With a higher lubricating oil content of coal and an increased oxygen concentration, the absorption peak intensities of -CH3, -CH2, -OH were lower and the C-O absorption peak intensity was higher. Therefore, lubricating oil promotes coal spontaneous combustion and the promoting effect is proportional to the lubricating oil content and oxygen concentration. Furthermore, the difference in heat released indicates that the effect of lubricating oil on coal spontaneous combustion is the result of the interaction between coal oxidation and lubricating oil oxidation.
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U2 - 10.1080/00102202.2020.1804887
DO - 10.1080/00102202.2020.1804887
M3 - Article
AN - SCOPUS:85089257416
SN - 0010-2202
VL - 194
SP - 1213
EP - 1225
JO - Combustion Science and Technology
JF - Combustion Science and Technology
IS - 6
ER -