Comparison on characteristics of adsorption /desorptionof vitrain and durain in long-flame coal
Received date: 2017-01-21
Revised date: 2017-03-25
Online published: 2017-06-10
In order to identify theadsorption/desorption capability of coalbed methane(CBM) of different macro lithotypes in low rank coal,weselected vitrain and durain samples of Dafosi No.4 coal in Binchang Mining Region to conduct the adsorption/desorption experiments,analyzed the adsorption/desorption characteristicsand studied the differences of adsorption/desorption and the nature of desorption from the perspectives of adsorption thermosdynamic.The results showthatcomponents of vitrain and durain mainly consist of the middle and micropores at Dafosi minefield,and the pore connectivity of durain,with the open hole as the main,is better than vitrain,which is mainly dominated by a semi closed flask shaped or ink bottle shaped pores;The adsorption/desorption capacity of different macro lithotypes was affected(from strong to weak) by pressure,temperature,moisture,granularity and pore characteristics;The effects of moisture and granularity on the different macro lithotypes are different in the process of depressurization and desorption,the desorption hysteresis rate ofdurain was larger than vitrain.The effect of differential pressure transfer on the adsorption of coal is not as good as that of competitive adsorption between water molecules and methane in coal.Desorption of CBM is the result of the joint effect of pressure drop(pressure-energytransferfunction) and vaporization of water vapor replacement of methane(displacement effect).
Ma Dong-min,Li Pei,Zhang Hui,Li Wei-bo,Yang Fu . Comparison on characteristics of adsorption /desorptionof vitrain and durain in long-flame coal[J]. Natural Gas Geoscience, 2017 , 28(6) : 852 -862 . DOI: 10.11764/j.issn.1672-1926.2017.04.006
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