基于小角X射线散射的灰分对煤孔隙结构的影响研究

王博文; 李伟

基于小角X射线散射的灰分对煤孔隙结构的影响研究

王博文,
李伟

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- 发布日期: 2017-01-19

Effect of Ash Content on Coal Pore Structure Based on Small Angle X-ray Scattering

WANG Bowen,
LI Wei

摘要

摘要: 为研究灰分对煤孔隙结构的影响，采用小角X射线散射（SAXS）定量解析了4个低挥发分烟煤脱灰前后的散射曲线和孔隙参数的变化规律。结果表明，所有煤样灰分主位于散射矢量1.0~2.0 nm^-1（对应孔隙尺寸3～6 nm）区间；所有煤样Porod曲线呈正偏离；相比未脱灰样，脱灰样孔隙数量、孔体积、孔比表面积和孔表面分形维数增大，微孔比例增加，最可几孔径和平均孔径下降。结论表明SAXS能够有效地表征煤中孔隙分布。
- 灰分 /
- 孔隙结构 /
- 孔隙度 /
- 小角X射线散射 /
- 分形维数
Abstract: To investigate the effect of ash content on coal pore structure, the change laws of scattering curves and pore parameters of four low-volatile bituminous coal samples were quantitatively analyzed by small angle X-ray scattering (SAXS). The X-ray scattering data indicate that for all samples, the ash is mainly confined in the same size range of 1.0 nm^-1< scattering vector q < 2.0 nm^-1corresponding to the pore size range of 3 nm to 6 nm. The positive deviation of SAXS data from Porod's law for all the test coal samples is observed. In comparison of original coal samples, the demineralised coal samples possess higher pore numbers, pore volume, pore specific surface area and pore surface fractal dimension. Additionally, the micropore volume increases associated with decreasing the most-probable and average pore diameter for demineralised coal samples. The results imply that SAXS can effectively characterize the pore distribution of coal.
- ash content /
- pore structure /
- porosity /
- small angle X-ray scattering /
- fractal dimension

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参考文献(17)

[1]	Karacan C , Okandan E. Adsorption and gas transport in coal microstructure: investigation and evaluation by quantitative X-ray CT imaging[J]. Fuel, 2001, 80(4): 509-520.
[2]	张慧. 煤孔隙的成因类型及其研究[J]. 煤炭学报, 2001, 26(1): 40-44.
[3]	Zhao Y X, Liu S M, Elsworth D, et al. Pore structure characterization of coal by synchrotron SAXS and TEM[J]. Energy & Fuels, 2014, 28(6): 3704-3711.
[4]	Li W, Liu H, Song X. Multifractal analysis of Hg pore size distributions of tectonically deformed coals[J]. International Journal of Coal Geology, 2015,144-145: 138-152.
[5]	Melnichenko Y B, He L L, Sakurovs R, et al. Accessibility of pores in coal to methane and carbon dioxide[J]. Fuel, 2012, 91(1): 200-208.
[6]	郑庆荣, 刘鸿福, 李伟, 等. 煤孔隙结构构造变形的压汞法和小角X射线散射表征[J]. 中国矿业, 2015, 24(1): 149-154.
[7]	Spitzer Z, Ulicky L. Specific surfaces of coals determined by small-angle X-ray scattering and by adsorption of methanol[J]. Fuel, 1976, 55(1): 21-24.
[8]	Radlinski A P, Mastalerz M, Hinde A L, et al. Application of SAXS and SANS in evaluation of porosity, pore size distribution and surface area of coal[J]. International Journal of Coal Geology, 2004, 59(3): 245-271.
[9]	Kalliat M, Kwak Y C, Schmidt P W. Small-angle X-ray investigation of the porosity in coals[M].Washing ton DC:American Chemical Society,1981.
[10]	Okolo G N, Everson R C, Neomagus H W J P, et al. Comparing the porosity and surface areas of coal as measured by gas adsorption, mercury intrusion and SAXS techniques[J]. Fuel, 2015, 141（141）: 293.
[11]	Koberstein J T, Morra B, Stein R S. The determination of diffuse-boundary thicknesses of polymers by small-angle X-ray scattering[J]. Journal of Applied Crystallography, 1980, 13(1): 34-45.
[12]	Cohaut N, Blanche C, Dumas D, et al. A small angle X-ray scattering study on the porosity of anthracites[J]. Carbon, 2000, 38(9): 1391-1400.
[13]	Bale H D, Schmidt P W. Small-Angle X-Ray-Scattering investigation of submicroscopic porosity with fractal properties[J]. Physical review letters, 1984, 53(6): 596-599.
[14]	Beaucage G, Kammler H K, Pratsinis S E. Particle size distributions from small-angle scattering using global scattering functions[J]. Journal of applied crystallography, 2004, 37(4): 523-535.
[15]	Mares T E, Radlinski A P, Moore T A, et al. Assessing the potential for CO₂ adsorption in a subbituminous coal, Huntly Coalfield, New Zealand, using small angle scattering techniques[J]. International Journal of Coal Geology, 2009, 77(1): 54-68.
[16]	李志宏, 赵军平, 吴东,等.小角X射线散射中Porod正偏离的校正[J].化学学报, 2000, 58(9): 1147.
[17]	Ismail I M K, Pfeifer P. Fractal analysis and surface roughness of nonporous carbon fibers and carbon blacks[J]. Langmuir, 1994, 10(5): 1532-1538.

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基于小角X射线散射的灰分对煤孔隙结构的影响研究

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Effect of Ash Content on Coal Pore Structure Based on Small Angle X-ray Scattering

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