Technical gazette, Vol. 22 No. 5, 2015.
Original scientific paper
https://doi.org/10.17559/TV-20150225022245
Laboratory study on low-temperature coal spontaneous combustion in the air of reduced oxygen and low methane concentration
Gang Wang
; Laboratory of Mine Disaster Prevention and Control, Shandong University of Science & Technology, Room 427, College of Mining and Safety Engineering, 579 Qianwangang Road Economic & Technical Development Zone, Qingdao Shandong Province, 266590 P. R. China
Jun Xie
; State Key Laboratory Breeding Base for Mining Disaster Prevention and Control, Shandong University of Science & Technology, Room 431, College of Mining and Safety Engineering, 579 Qianwangang Road Economic & Technical Development Zone, Qingdao Shandong Pr
Sheng Xue
; CSIRO Energy Flagship, PO Box 883, Kenmore, QLD 4069, Australia
Haiyang Wang
; State Key Laboratory Breeding Base for Mining Disaster Prevention and Control, Shandong University of Science & Technology, Room 224, College of Mining and Safety Engineering, 579 Qianwangang Road Economic & Technical Development Zone, Qingdao Shandong Pr
Abstract
Laboratory tests were conducted to study coal spontaneous combustion at low-temperature (30 ÷ 200 °C) in the air of reduced oxygen (10 ÷ 21 %) and low methane concentrations (0 ÷ 3 %). The production of carbon monoxide in coal spontaneous combustion was analysed. The test results show that both oxygen and methane concentrations affect coal spontaneous combustion. At given oxygen concentration the methane concentration in air had a positive impact on coal spontaneous combustion and the impact increased with methane concentration. This impact was weakened and diminished with the rise of temperature. The initial carbon dioxide temperate at which carbon monoxide started to appear increased with the reduction of oxygen concentration in the air and the increase was somewhat negated by the presence of increased methane concentration in air. However, as the oxygen concentration reduced to a certain value, methane concentration showed little or no influence on coal spontaneous combustion. The low temperature sorption characteristics of oxygen and methane by coal were applied to explain the results. The findings in this study are particularly useful in the prediction and control of coal spontaneous combustion in gassy coal mines.
Keywords
coal mine; coal spontaneous combustion; low temperature; low methane concentration; oxygen concentration
Hrčak ID:
147303
URI
Publication date:
22.10.2015.
Visits: 2.137 *