Details

Autor(en) / Beteiligte

• Deng, Jun
• Zhao, Jing-Yu
• Huang, An-Chi
• Zhang, Yan-Ni
• Wang, Cai-Ping
• Shu, Chi-Min

Titel

Thermal behavior and microcharacterization analysis of second-oxidized coal

Ist Teil von

• Journal of thermal analysis and calorimetry, 2017, Vol.127 (1), p.439-448

Ort / Verlag

Dordrecht: Springer Netherlands

Erscheinungsjahr

2017

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Among coal-producing countries, China has witnessed the highest frequency and severity of coal fires. During mining in the re-mining face and the lower part of the thick coal seam (or coal seam group), second or multiple oxidations of the residual coal can readily occur in mined-out areas, severely increasing the risk of coal fires. The study of multiple oxidations of coal aids in the early detection of spontaneous combustion of remaining coal in the mined-out areas. The characteristics of coal fires are demonstrated using fresh coal samples (first-oxidized coal) and oxidized coal samples (second-oxidized coal) from four different ranks of coals. Proximate and elemental analysis, Fourier transform spectroscopy, and thermogravimetry–differential scanning calorimetry were adopted to investigate the quality, microcharacteristics, characteristic temperatures, and apparent activation energy of second-oxidized coal. In addition, the effect of spontaneous combustion at heating rates of 5.0, 10.0, and 15.0 °C min −1 was studied. Compared with the four samples of first-oxidized coal, those of second-oxidized coals cause fire easily under the same conditions.