Discussion on Geological Factors Controlling Adsorption Characteristics of Coal Rock
On the basis of summarizing the previous research results,selects the representative experimental data of coal and rock samples at home and abroad,and discusses the influencing factors of Langmiur volume and Langmiur pressure respectively.The research shows that the coal maturity(coal rank),coal type,temperature,ash content and water content all affect the adsorption capacity of coal and rock,among which the coal and rock maturity is the most important factor.It is concluded that the Langmiur volume presents a"U"-shaped or"first rising-then falling-then rising"trend with the maturity of coal and rock,which reflects the phenomenon that the adsorption capacity of middle coal rank is weaker than that of low and high coal rank,mainly because the maturity of coal and rock affects the pore structure and thus the adsorption capacity.The influence of coal-rock type on Langmiur volume is objective,the content of vitrinite is high,and the adsorption capacity tends to be stronger.Ash content and moisture have a complex nonlinear negative relationship with Langmiur volume of coal rock,which is reflected in experimental studies,and can also be recognized to a certain extent in the analysis of low coal rank data.Langmiur pressure is also significantly affected by coal maturity(coal rank),showing a trend of decreasing with the increase of coal rank.The effects of ash or moisture and vitrinite content can be recognized to a certain extent in the low coal rank region,but it is difficult to form a regular understanding,while the middle and high coal rank region does not reflect obvious characteristics.
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万方数据
