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Abstract Hg-injection experiment was carried out with coal samples in the gas coal from Caiyuan Mine in Weishan City，Shandong Province，and the coking coal from Malan Mine in Gujiao City，Shanxi Province，to find out the distribution regularity of pore volume and specific surface area in various pore sizes. The absorption- desorption experiment on binary-component gas(CH4/CO2) was carried out with equilibrium water coal sample to analyze the influence on coal adsorbing gas in deep coal bed in the aspect of pore configuration. The results indicate that the pore configuration of the coking coal is more complicated than that of gas coal；and there are smaller and micro pores in coking coal rather than in gas coal. The absorption capacity of coal is determined by the distribution of micro pores；and the most effective absorption pore radii are below 10 nm. The absorption capacity of coking coal is stronger than that between gas coal. It is analyzed that the absorption capacity difference of gas coal and coking coal would lead to the phenomenon that absorption in high-pressure stage is less than that in low-pressure stage in the experiment. Based on the research of the pore distribution and absorption-desorption characteristics of coal，the absorption capacity of coal in deep coal bed can be revealed at micro level；and the characteristics and mechanism of absorption-desorption of coal are explored，which enriches the absorption-desorption theory of coal and is of great significance to coal and gas outburst prevention and coal-bed methane exploitation.
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Received: 14 January 2009
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