Adsorptive Capacity of Coals and Its Affecting Factors
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摘要: 为了研究煤的储气性能, 笔者对1 2 4个煤样进行等温吸附试验、煤岩测试、工业分析、压汞试验和低温液氮测试.研究表明: (1)煤变质对煤吸附能力具有控制作用, 反射率从0.3%~ 4.2 5 %, 可燃基的Langmuir体积是1 1.2 5~ 4 7.1 6cm3 / g; (2)平衡水煤样吸附量与镜质组含量呈正相关、与惰质组含量呈负相关、与孔隙比表面积、微孔比表面积、微孔孔体积呈正相关; (3)水分、温度对煤的吸附能力有负面影响.煤变质程度不同, 吸附曲线的变化趋势不同: 气煤随着温度和压力增加吸附量一直增大, 说明压力的影响起主导作用; 无烟煤在温度小于6 0℃、压力小于1 5MPa之前, 随着温度和压力同时增加吸附量增大, 说明压力的影响起主导作用, 之后, 吸附量减小。Abstract: In order to research on the gas storage capacity of coal, a series of tests were carried out using 124 coal samples. These tests include: isothermal adsorption test, coal petrography analysis, proximate analysis, mercury intrusion test and cryogenic liquid nitrogen test. The research shows: (1) Coal metamorphism controls the adsorptive capacity. As R max increases from 0.3% to 4.25%, the volume of Langmuir increases from 11.25 to 47.16 cm3/g. (2) The capacity rate of the coal processed with equilibrium moisture has a normal correlation to the vitrinite content and an inverse correlation to the inertinite content of the coal, and displays a normal correlation to the specific surface areas of pore and micropore, and micropore volume. (3) The moisture and temperature have inverse influence on coal adsorptive capacity. Coals at different metamorphic stages have different variation tendency of adsorption curves. The adsorptive capacity of gas coal increases with temperature and pressure, indicating the dominant role of pressure. The adsorptive capacity of anthracite increases with increasing temperature and pressure when the temperature is lower than 60 ℃ and the pressure lower than 15 MPa, which also indicates the dominant role of pressure. When the temperature is over 60 ℃ and the pressure higher than 15 MPa, the adsorptive capacity of the anthracite decreases, suggesting that the influence of temperature is stronger than that of pressure.
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Key words:
- coal /
- metamorphism /
- adsorptive capacity /
- gas storage capacity
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图 1 不同变质程度(Rmax)煤等温(45℃)吸附能力比较
Fig. 1. Isothermal(45℃)adsorption capability of different metamorphosed degree(Rmax)coals
图 3 Langmuir体积与Langmuir压力的关系
Fig. 3. Relation of Langmuir volume and Langmuir pressure
图 4 干燥基煤样Langmuir体积与煤变质关系
Fig. 4. Relation of dry coal sample Langmuir volume and coal metamorphism
图 5 平衡水煤样Langmuir体积与煤变质关系
Fig. 5. Relation of balance water coal sample Langmuir volume and coal metamorphism
图 6 Langmuir体积与煤的显微组分含量关系
Fig. 6. Relation of Langmuir volume and maceral group of coal
图 7 平衡水分含量与煤的显微组分含量关系
Fig. 7. Relation of balance water content and maceral group content of coal
图 8 Langmuir体积与煤的孔表面积的关系
Fig. 8. Relation of Langmuir volume and pore surface area of coal
图 9 Langmuir体积与总孔体积、微孔孔体积的关系
Fig. 9. Relation of HT5 coal Langmuir volume and all pores volume, tiny pores volume
图 10 煤样的分析基水分、平衡水分与Rmax关系
Fig. 10. Relation of analysis moisture, balance moisture of coal sample and Rmax
图 11 HJH- 8煤不同温度的等温吸附曲线
Fig. 11. Isothermal adsorption curves of HJH-8 coal at dif- ferent temperatures
图 12 YQ-15煤不同温度的等温吸附曲线
Fig. 12. Isothermal adsorption curves of YQ-15 coal at dif- ferent temperatures
图 13 HJH-8(a), YQ-15(b)煤在不同压力下温度与吸附量关系
Fig. 13. Temperature and adsorption relation of HJH-8(a) and YQ-15(b) coal at different pressures
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Crosdale P. J., Beamish B. B., Valix M. . 1998. Coalbed methane sorption related to coal composition. International Journal ofCoal Geology, 35: 147- 158. Gürdal, G., Yalcin M.N. . 2001. Pore volume and surface area of the Carboniferous coals from the Zonguldak basin(NW Turley)and their variations with rank and maceral composition.,International Journal of Coal Geology 48: 133-144. doi: 10.1016/S0166-5162(01)00051-9 Levy J.H., Day S.J., Killingley J.S. . 1997. Methane capacities of Bowen basin coals related to coal properties. Fuel, 76(9): 813- 819. doi: 10.1016/S0016-2361(97)00078-1 Zhong L.W., Zhang X.M. . 1990. The relation of adsorption capability of coal and coal metamorphose degree and coal maceral. Coal Geology and Exploration, 18(4): 29- 35(in Chinese with English abstract). 钟玲文, 张新民. 1990. 煤的吸附能力与其煤化程度和煤岩组成间的关系. 煤田地质与勘探, 18(4): 29-35. https://www.cnki.com.cn/Article/CJFDTOTAL-MDKT199004008.htm -
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