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- Title
A method for evaluating the spontaneous combustion of coal by monitoring various gases.
- Authors
Guo, Jun; Wen, Hu; Zheng, Xuezhao; Liu, Yin; Cheng, Xiaojiao
- Abstract
• A novel evaluating method was proposed to determinate the spontaneous combustion of coal. • Variations of the indexes of spontaneous combustion from three rank coal were obtained. • The prediction accuracy of this method can be set according to the actual requirements of coal mine site. • The evaluating method is simple and applicable to the coal of different ranks. Coal spontaneous combustion has always been a worldwide problem, which causes waste of coal resources, greenhouse gas emissions and other atmospheric environmental pollution problems. Although coal temperature monitoring is the most direct and accurate means of predicting the spontaneous combustion of coal, the coal temperature often cannot be directly measured owing to various physical restrictions. As an alternative, the present study assessed the qualitative and quantitative analysis of the CO and C 2 H 4 formation rates, as well as various gas ratios such as the CO/CO 2 ratio and fire coefficient R 2 (R 2 = 100×ΔCO/ΔO 2), to predict spontaneous combustion. This method was established based on the temperature-programmed experiments of three different coal rank (including lignite, bituminous coal and anthracite), and was verified using data obtained from on-site monitoring at an actual mine. The results show that the method accuracy is as high as 97% when predicting the coal temperature to within 15 °C (allowable error range of the predicted value). This degree of accuracy should be sufficient for on-site fire prevention and control. This new technique is not only accurate and reliable but also has theoretical significance with regard to the identification of coal spontaneous combustion in goaf and for the development of fire prevention and suppression technologies.
- Subjects
SPONTANEOUS combustion; COAL combustion; BITUMINOUS coal; ANTHRACITE coal; COAL mine waste; COAL mining
- Publication
Process Safety & Environmental Protection: Transactions of the Institution of Chemical Engineers Part B, 2019, Vol 126, p223
- ISSN
0957-5820
- Publication type
Article
- DOI
10.1016/j.psep.2019.04.014