Assessment of spontaneous heating of fresh and oxidized coals

Praharaj, Sanjib (2013) Assessment of spontaneous heating of fresh and oxidized coals. BTech thesis.



Coal oxidation is a natural phenomenon, It may begin in the pit itself or during the operations of extraction, preparation, transportation and storage. A fresh coal is more reactive to oxygen than a weathered coal i.e. it is more liable to spontaneous heating. To see the rate of decrease in the oxidation rate, first coal samples were taken and three samples were prepared from each sample. First sample was same as the sample taken while the second sample was obtained by oxidizing the sample at 200 degree C for 1 day. Third sample was obtained by oxidizing the coal at 200 degree C for 3 day. Then susceptibility of each of these samples were checked by crossing point temperature method, differential thermal analysis and wet oxidation potential method. For the experimentation purpose total of 15 samples were taken. Among these 6 samples were from SECL, 2 samples were from MCL, 2 samples were from CCL, 3 samples were from SCCL. 2 samples were collected from Indonesia to compare it’s characteristics with the Indian coals. The intrinsic property of both the fresh and oxidized coal was determined by proximate analysis. Similarly susceptibility of both fresh and oxidized coal to spontaneous heating was calculated by crossing point temperature and wet oxidation potential.From the experimental results it was found that the volatile matter content of the coal increases as the sample is oxidized while the liability of the coal to spontaneous heating decreases with oxidation. For coals with high fixed carbon content the change in liability of spontaneous heating is significant even after 1 day oxidation. While in case of coals with low fixed carbon content the change in liability of spontaneous heating is not too significant. It is expected that finding of this work will help in deciding whether to adopt any precautionary measures for oxidized coals.

Item Type:Thesis (BTech)
Uncontrolled Keywords:Oxidation; Sampling; Volatile matter; Crossing point temperature; Wet oxidation potential; Differential thermal analysis
Subjects:Engineering and Technology > Mining Engineering > Safety in Mining
Engineering and Technology > Mining Engineering > Environemental Impact
Divisions: Engineering and Technology > Department of Mining Engineering
ID Code:4710
Deposited By:Hemanta Biswal
Deposited On:29 Oct 2013 11:06
Last Modified:20 Dec 2013 10:43
Supervisor(s):Sahu, H B

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