CONVENTIONAL AND ADVANCED ANALYSIS OF CHAR FORMATION OF COALS.
DOI:
https://doi.org/10.60787/jnamp.v67i2.387Keywords:
Coal, Char, Pyrolysis, Coal Conversion Energy contentAbstract
The knowledge of the physical and chemical properties of the transition of coal to char plays a major role in the reactivity of the coal char. Though previous research findings have reported the characterization of coal and the subsequent chars from such coals, analysis on the transition stage have not been critically considered. This study entails the characterization of coal and chars of different ranks using both conventional and advanced analytical techniques.
Six coal samples of different ranks were used in this study. From the ultimate analysis, the carbon content of the coals (daf) varies from 92.3 to 70.5% for anthracite to lignite respectively for the parent coal and from 89.0 to 69.2% for the demineralized coals. The atomic ratio O/C decreases (0.20 for lignite to 0.02 for anthracite); and the H/C ratio equally decreases with increase in coal rank (1.16 for lignite to 0.36 for anthracite).
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References
. Feng, B.O.; Bhatia, S.K., Variation of the pore structure of coal chars during gasification. Carbon 2003, 41, 507-523.
. Van Dyk, J.C.; Benson, S.A.; Laumb, M.L.; Waanders, B.; Coal and coal characteristics to understand mineral transformations and slag formation. Fuel 2009, 88,1057-1063.
. Chelgani, S.C.; Mesroghli, S.; Hower, J.C.; S imultaneous prediction of coal rank parameters based on ultimate analysis using regression and artificial neural network. International Journal of Coal Geology 2010, 83, 31-34.
. Hurt, R.; Sun, J. –K.; Lunden, M.; A kinetic model of carbon burnout in pulverized coal combustion. Combustion and Flame 1998, 113, 181-197.
. Sarici-Ozdemir, C.; Onal, Y.; Akmil-Baser, C., The effects of demineralization and swelling in producing active carbon from Turkish lignites. Fuel Processing Technology 2006, 87, 979-986.
. Shui, H.; Wang, G., Effect of hydrothermal treatment on the extraction of coal in the CS2/NMP mixed solvent. Fuel 2006, 85, 1798-1802.
. Wilkins, R.W.T; George, S.C. Coal as a source rock for oil: a review. International Journal of Coal Geology 2002, 50, 317-361.
. Ward, C.R.; Li, Z.; Gurba, L.W., Comparison of elemental composition of macerals determined by electron microprobe to whole coal ultimate analysis data. International Journal of Coal Geology 2008, 75, 157-165.
. Ibarra, J.V.; Munoz, D.; Moliner, R., FTIR study of the evolution of coal structure during the coalification process. Organic Geochemistry 1996, 24, 725-735.
. Li, Y.; Cao, X.; Zhu, D.; Chappel, M.A.; Miller, L.F.; Mao, J., Characterization of coals and their laboratory-prepared black carbon using advanced solid-state 13C nuclear magnetic resonance spectroscopy. Fuel Processing Technology 2012, 96, 56-64.
. Lu, L.; Sahajwalla, D.; Kong, C.; Harris, D., Quantitative X-ray diffraction analysis and its application to various coals. Carbon 2001, 39, 1821-1833.
. Lunden, M.M.; Yang, N.Y.C.; Headley, J.; Shaddix, C.R., Mineral-char interactions during char combustion of a high volatile coal. Proceedings of Combustion Institute 1998, 1695-1702.
. Orrego-Ruiz, R.A.; Cabanzo, R.; Mejia-Ospino, E., Study of Colombian coals using photoacoustic Fourier transform infrared spectroscopy. International Journal of Coal Geology 2011, 85, 307-310.
. Painter, P.; Sobkowiak, M.; Heidary, S.; Coleman, M., Current status of FTIR in the analysis of coal structure. Fuel 1994, 39, 49-53.
. Pusz, S.; Duber, S.; Kwiecinska, B., The study of textrural and structural transformations of carbonized anthracites. Fuel Processing Technology 2002, 77, 173-180.
. Rodrigues, S.; Suarez-Ruiz, I.; Marques, M.; Camean, I.; Flores, D., Microstructural evolution of high temperature treated anthracites of different rank. International Journal of Coal Geology 2011, 87, 204-211.
. Sekine, Y.; Ishikawa, K.; Kikuchi, E.; Matsukata, M.; Akimoto, A., Reactivity and structural change of coal during steam gasification. Fuel 2006, 85, 122-126.
. Supaluknari, S.; Larkins, F.P.; Redlich, P.; Jackson, W.R., Determination of aromaticities and other structural features of Australian coals using solid state 13C NMR and FTIR spectroscopies. Fuel Processing Technology 1989, 23, 47-61.
. Neavel, R.C., “Origin, petrography and classification”, Chemistry of Coal Utilization. 2nd supplement volume. Wiley 1981, New York.
. Jasienko, S.; Matuszewska, A.; John, A., Properties and structure of hard coals from the borehole Niedobczyce IG-1 in the Rybnik Coal District, Upper Silesian Coal Basin, their petrographic and group constituents. 2. Variations in petrographic composition of the coals along the depth of borehole and alterations in structure of the coals characterized by vitrinites spectroscopic analyses (X-ray, IR). Fuel Processing Technology 1995, 41, 221-232.
. Lazaro M-J, Moliner R, Suelves I. Non-isothermal versus isothermal technique to evaluate kinetic parameters of coal pyrolysis. Journal of Analytical and Applied Pyrolysis 1998; 47: 111 – 125.
. Rubiera F, Arenillas A, Pevida C, Garcia R, Pis JJ, Steel KM, Patrick JW. Coal structure and reactivity changes induced by chemical demineralization. Fuel Processing Technology 2002; 79: 273 – 279.
. Alonso MJG, Borrego AG, Alvarez D, Parra JB, Menendez R. Influence of pyrolysis temperature on char optical structure and reactivity. Journal of Analytical and Advanced Pryloysis 2001; 58-59: 887 – 909.
. Strydom CA, Bunt JR, Schobert HH, Raghoo M. Changes to the organic functional groups of an inertinite rich medium rank bituminous coal during acid treatment processes. Fuel Processing Technology 2011; 92: 764 – 770.
. Odeh AO. Exploring the potential of petrographics in understanding coal pyrolysis. Energy 2015a; 87; 555 – 565.
. Odeh AO. Comparative study of the aromaticity of the coal structure during the char formation process under both conventional and advanced analytical techniques. Energy & Fuels 2015b; 29; 2676 - 2684.
. Odeh AO. Qualitative and quantitative ATR-FTIR analysis and its application to coal char of different ranks. Journal of Fuel Chemistry and Technology 2015c; 43; 129 – 137.
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