Study on Methane Adsorption Characteristics of Different Rank Coals in Presence of Moisture
Authors
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State Key Laboratory of Coal Resource and Mine Safety, School of Resources and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100 083 ,CN
Kai Wang -
School of Resources and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100 083 ,CNYifeng Jiang
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School of Resources and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100 083 ,CNTong Kan
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School of Resources and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100 083 ,CNAng Liu
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School of Resources and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100 083 ,CNXinyu Chang
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School of Resources and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100 083 ,CNGuanzhu Xu
Keywords:
Moisture, Methane, Isothermal Adsorption, Coal Rank.Abstract
Experiments on methane sorption of four coals from north China ranging from high-volatile bituminous to anthracite with different moisture have been carried out. The results show that the coal rank has a signi?cant impact on the absorption characteristic of the moist coal. The moisture content of coals varies with volatile mater shows a U-shape function and reaches the minimum at about 30% volatile matter under the same humidity and temperature condition. The methane adsorption isotherms of four different rank coals in the presence of moisture can be well fitted by the Langmuir model. The experimental results show that there is a critical moisture content above which the moisture has no inhibition effect on methane sorption. Furthermore, coal rank influences the critical moisture content. High rank coal usually has higher critical moisture than low rank coal. Moreover, the adsorption capacity of low rank coal reduces more by the moisture than high rank coal at the moisture content. A new empirical formula was proposed and it can well fit the data of the gas adsorption capacity of four coals with different moisture. This empirical formula explains the effect of coal rank on the adsorption capacity of moist coal from the perspective of mathematical theory.
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References
Mirandola, A. and Lorenzini, E. (2016): “Energy, environment and climate: from the past to the future.” International Journal of Heat and Technology, 34(2): 159-164.
Busch, A. and Gensterblum, Y. (2011): “CBM and CO2-ECBM related sorption processes in coal: A review,” Int J Coal Geol, 87(2): 49-71.
Crosdale, P. J., Moore, T. A. and Mares, T. E. (2008): “Influence of moisture content and temperature on methane adsorption isotherm analysis for coals from a low-rank, biogenically-sourced gas reservoir.” Int J Coal Geol, 76(1): 166-174.
Krooss, B. M., van Bergen, F., Gensterblum, Y., Siemons, N., Pagnier, H. J. M. and David, P. (2002): “High-pressure methane and carbon dioxide adsorption on dry and moisture-equilibrated Pennsylvanian coals.” Int J Coal Geol, 51(2): 69-92.
Joubert, J. I., Grein, C. T. and Bienstock, D. (1974): “Effect of moisture on the methane capacity of American coals.” Fuel, 53(3): 186-197.
Joubert, J. I., Grein, C. T. and Bienstock, D. (1973): “Sorption of methane in moist coal.” Fuel, 52(3): 181-185.
Guo, H. J., Cheng, Y. P., Wang, L., Lu, S. Q. and Jin, K. (2015): “Experimental study on the effect of moisture on low-rank coal adsorption characteristics.” J Nat Gas Sci Eng, 24(4): 245-251.
Levy, J. H., Day, S. J. and Killingley, J. S. (1997): “Methane capacities of Bowen Basin coals related coals related to coal properties.” Fuel, 76(4): 813-819.
Ettinger I., L. I. L., Dmitriev, A. M. and Shaupakhina, E. S. (1958): US Bureau of Mines Translation No. 1505/National Coal Board Translation A1606SEH.
Prinz, D. and Littke, R. (2005): “Development of the micro- and ultramicroporous structure of coals with rank as deduced from the accessibility to water.” Fuel, 84(12-13): 1645-1652.
Zhang, H. T., Wei, J. P., Wang, Y. G., Wen, Z. H. and Yao, B. H. (2016): “Experimental Study on the Parameters Effect on the Sampling Method Based on Negative Pneumatic Conveying.” International Journal of Heat and Technology, 34(1): 51-56.
Pan, Z. J., Connell, L. D., Camilleri, M. and Connelly, L. (2010): “Effects of matrix moisture on gas diffusion and flow in coal.” Fuel, 89(11): 3207-321.
Wang, H. Y., Cheng, Y. F. and Yu, B. (2015): “Adsorption effect of overlying strata on carbon dioxide in coalfied fire area.” International Journal of Heat and Technology, 34(2): 11-18.
Allardice, D. J. and Evans, D. G. (1978): Moisture in coal. In: Karr Jr, C. (Ed.), Analytical methods for coal and coal products, New York, USA: Academic Press.
Zhao, J. L., Xu, H., Tang, D. Z., Mathews, J. P., Li, S. and Tao, S. (2016): “A comparative evaluation of coal specific surface area by CO2 and N2 adsorption and its influence on CH4 adsorption capacity at different pore sizes.” Fuel, 183(1): 420-431.
Day, S., Sakurovs, R. and Weir, S. (2008): “Supercritical gas sorption on moist coals,” Int J Coal Geol, 74(3): 203-214.
Švábová, M., Weishauptová, Z. and Pribyl, O. (2012): “The effect of moisture on the sorption process of CO2 on coal.” Fuel, 92(1): 187-196.
Gensterblum, Y., Busch, A. and Krooss, B. M. (2014): “Molecular concept and experimental evidence of competitive adsorption of H2O, CO2 and CH4 on organic material.” Fuel, 115(4): 581-588.
Zhang, Z. C. and Ma, P. L. (2008): “Experimental on moisture effects on the gas adsoption speciality of different kinds of coal.” J China Coal Soc, 33( 2): 144-147, Feb. 2008.
Li, B., Ren, J. G. and Song, Z. M. (2016): “Image Processing-based Quantitative Representation of Coal Porosity.” Revista de la Facultad de Ingeniería, 31(5): 221-228.
