Assessment of Auto-Oxidation Potential of Some Indian Coals by Differential Thermal Analysis (DTA) Technique
Authors
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Department of Mining Engineering, IIT (BHU) Varanasi, 221 055 ,IN
B. Behera -
Department of Mining Engineering, NIT Rourkela, 769 008 ,INH. B. Sahu
Keywords:
Auto-Oxidation, Spontaneous Heating, Differential Thermal Analysis, Intrinsic Properties, Coal.Abstract
It is a well-known fact that coal when exposed to air, undergoes oxidation, even at ambient temperature conditions.The process is exothermic in nature. If the amount of heat liberated during the process is not dissipated, it leads to an increase in temperature, which in turn enhances the rate of reaction, ultimately culminating in open fire. These fires are the major causes of accidents resulting in loss of lives and property across the globe. Apart from loss of valuable coal reserves, blockage of resources and capital, reduction of heating values and coking properties; it also causes serious environmental pollution. However, all coals are not susceptible to auto-oxidation to the same extent. Therefore, accurate assessment of the oxidative tendency is essential to plan the production and storage capabilities in mines.There are different innovations and technologies available in various parts of world to assess and control spontaneous heating tendency, till date there is no unanimity to adopt single method for its assessment. In this study, an attempt has been made to study the auto-oxidative tendency of Indian coal seams by using different thermal technique (DTA). For this purpose 48 coal samples were collected from all major coalfields of the country.The intrinsic properties of these samples were determined using proximate analysis and bomb calorimeter. Correlation study between the intrinsic parameters and susceptibility indices indicate that DTA can be a better method for assessment of the auto-oxidation potential of coal.
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References
Banerjee, S. C. (1985): Spontaneous Combustion of Coal and Mine Fires, Oxford & IBH Publishing Co. Pvt. Ltd., 1st Edition, 1985, pp. 1-38.
Banerjee, S. C. (2000): Prevention and combating mine fires, Special Indian edition, Publisher: Oxford and IBH Publishing Co. Pvt. Ltd., New Delhi, 2000, p.91-92 & 77.
Banerjee, S.C. and Chakravarty, R.N. (1967): “Use of D.T.A. in the Study of Spontaneous Combustion of Coal,” Journal of Mines, Metals and Fuels, 1967, Jan., pp. 1-5.
Beamish, B. B. and Arisoy, A. (2008a): Effect of intrinsic coal properties in self-heating rates, 12th U.S/North American Mine Symposium, 2008a, pp. 149-152.
Chen, Y., Mori, S. and Pan, W. (1996): “Studying the mechanism of ignition of coal particles by TG-DTA,” Thermochimica Acta, 1996, pp.149-158.
Clemens, A. H. , Mathew, T. W. and Rogers, D. E. (1990): “DTA studies of the low temperature oxidation of low rank coals,” Fuel, 69, 1990, pp. 255-256.
DGMS, Statistics of Mines in India, Volume 1 (Coal). Directorate General of Mines Safety, Ministry of Labour & Employment, Government of India, 2011.
Dhar, B. B. (1996): Keynote address on status of mine fires – trends and challenges. In Proceedings of the Conference on Prevention and Control of Mine and Industrial Fires – Trends and Challenges, Calcutta, India, 1996, pp. 1-8.
Indian Standard): 436 (Part-I, Section-I) (1964): Methods for sampling of coal and coke, Part- I, Sampling of coal, Section-1, Manual Sampling, Bureau of Indian Standards, New Delhi, pp. 3-23.
Indian Standard: 1350 (Part-II) (1970): Methods of test of coal and coke: Determination of calorific value, Bureau of Indian standards, New Delhi, pp. 3-27.
Indian Standard: 1350 (Part-I) (1984): Methods of test of coal and coke: Proximate Analysis, Bureau of Indian standards, New Delhi, pp. 3-28
Kucuk, A., Kadoglu, Y. and Gulaboglu, M. S. (2003): “A study of spontaneous combustion characteristics of a Turkish lignite: particle size, moisture of coal, humidity of air,” Combustion and Flame, Vol. 133, 2003, pp. 255-261.
