Adsorption Respondence of Different Coal Body Structures and Its Influence Mechanism
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摘要: 为了研究不同煤体结构煤的吸附行为差异和作用机理, 以焦作煤田为研究区, 对煤体破坏严重的糜棱煤和原生结构煤的岩石学组成、吸附性和孔隙性进行了测试, 结果表明: 煤体破坏后, 吸附、解吸能力增大; 温度增加, 煤的吸附能力均为下降, 解吸能力增加.相比于原生结构煤, 随着温度增加, 糜棱煤吸附能力下降趋势和解吸能力增大趋势比原生结构煤更为明显.研究认为: 煤体破坏后, 不同孔径段的孔隙数量均有增大, 使得煤样容纳气体的能力增大.特别是大中孔含量的增大, 导致了糜棱煤样更容易发生解吸.另外, 煤体破坏后的煤级增高、镜质组含量增大和惰质组含量减小也对吸附能力增大具有重要作用, 而灰分含量不是决定两类煤吸附性差异的主要因素.Abstract: In order to study the difference and its controlling mechanism of gas adsorption on coals with different body structures, such parameters as the macroscopic petrographic constituents, the adsorption capacity and pore structure of undeformed and mylonitic coal samples of Jiaozuo coalfield, were measured. The experimental results show that the mylonitic coal is of higher ability of absorption and desorption than that of the undeformed coal. With the rising of temperature, the mylonitic coal is more evident than undeformed coal in the tendency of decline in absorption and increase in desorption. The study concludes that the pores in different pore diameter increases after the coal body is deformed, so the gas-containing capacity of mylonitic coals is stronger. Especially, the contents of macroand meso-pore are higher in mylonitic coals, so the desorption becomes easier. Moreover, other factors, including the coal rank rise, the vitrinite content increase and inertinite content decrease after the coal body is deformed, lead to the increase of absorption ability. The study also concludes that the ash content is not the main controlling factor on the adsorption difference between two types of coals with different coal body structures.
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Key words:
- Jiaozuo coalfield /
- coal sturcture /
- porosity /
- adsorbability /
- mechanism analysis
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图 1 不同温度下古汉山井田两类煤的等温吸附曲线
Fig. 1. Isotherm adsorption curves of two kinds of coals of Guhanshan coalfield under different temperatures
图 2 不同温度下两类煤的吸附参数变化
Fig. 2. Langmuir adsorption parameter changes of two kinds of coals under different temperatures
图 3 温度增加1 ℃后两类煤的吸附减少量与压力的关系
Fig. 3. Relation between the absoption decrement of two kinds of coals under perunit temperature rise and pressure
图 4 显微组分含量与Langmuir体积参数(VL) 的关系
Fig. 4. Relation between maceral composition and Lang muirvolume parameter
图 5 灰分含量(Ad) 与Langmuir体积参数(VL) 的关系
Fig. 5. Relation between ash content and Langmuir volume parameter
表 1 煤样的显微组分定量统计结果
Table 1. Quantitative statistic data of the macerals content of different coal samples
表 2 煤样孔隙结构参数测试结果
Table 2. Measured data of pore structure parameters of different coal samples
表 3 煤样吸附性实验测试结果
Table 3. Adsorption experiment results of the different coal samples
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