Experimental studies of spontaneous combustion and anaerobic cooling of coal. (1st October 2015)

• Record Type: Journal Article
• Authors: Deng, Jun; Xiao, Yang; Li, Qingwei; Lu, Junhui; Wen, Hu
• Is Part Of: Fuel. Volume 157(2015)
• Page Start: 261
• Page End: 269
• Publication Date: 2015-10-01
• Subjects: Gas ratios -- Oxygen consumption rate -- Heat intensity -- Cooling rate -- Coal temperature; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2015.04.063
• Languages: English
• ISSNs: 0016-2361

Abstract

Highlights: A 15-t experimental furnace of coal spontaneous combustion was constructed. Characteristics of coal spontaneous combustion and anaerobic cooling were studied. Temperature variations of coal spontaneous combustion and anaerobic cooling were obtained. Quantitative calculation method of oxygen consumption rate and heat intensity was created. Corresponding relationship between gas ratios and coal temperature was established. Abstract: To study the spontaneous combustion and anaerobic cooling of coal, a 15-t experimental furnace was constructed, and large-scale spontaneous combustion tests were conducted. The coal sample came from No. 3 seam in Dongtan mine in Yanzhou coalfield, Shandong province, China. The variations in temperature, gas ratios, oxygen consumption rate, and heat intensity were studied. The experimental results show that for coal spontaneous combustion below 70 °C, the temperature increases slowly with time and the oxygen consumption rate and heat intensity increase slowly with temperature and accelerate when the temperature exceeds 100 °C. In anaerobic cooling, the cooling rate decreases with the decrease in temperature. When the coal temperature goes from 452.7 to 250.0 °C, the cooling rate decreases rapidly, whereas below 250.0 °C, the cooling rate decreases slowly. The variation trends of the CO2 /CO, CH4 /C2 H6, C2 H4 /C2 H6, and C3 H8 /C2 H6 gas ratios in the spontaneous combustion and anaerobic cooling of coal in a certain range of temperature can be used to predict the temperature of coal.