Zpravodaj Hnědé uhlí 2015, 55(2)

Evaluation of the degree of risk of the spontaneous combustion of brown coal on landfill sites with the use of modern numerical methods

Ing. Petr Klouda, Ing. Vlastimil Moni, Ph.D., Ing. Marcel Dlask, Ing. Petr Kolman, Ing. Petr Urban

The article presents a summary of the risk assessment of spontaneous combustion of brown coal. The evaluation was carried out analysing the extensive database of information on the development of the state variables and desorbed gases of the stored brown coal. The data were obtained from the complex long term measurement implemented on landfill sites at the selected mine companies. In the final phase of the project the results of the thermal images obtained by evaluating the acquired thermograms were assessed in comparison with the results of the gas and coal samples taken during the experiment. In addition the influence of atmospheric conditions (insulation, aeration, rain water donation, alterations of the barometric pressure, etc.) were evaluated as well as the impact of the degradation of coal mass, physical and chemical factors, and the impact of other failure factors on the processes of spontaneous combustion of coal. The gas samples obtained in situ were compared with the laboratory measurements of gas indicators of auto ignition using the method of thermal oxidation to obtain the correlation to estimate a temperature of the spontaneous combustion hot spot.

Keywords: spontaneous ignition, brown coal, landfills, evaluation of predisposition to a spontaneous ignition

Published: June 1, 2015  Show citation