Study On Microcrystalline Structure Of Organic Microcomponent And Pores Feature In Coal

Coal is an organic chemical fuel composed of chitin,vitrinite,inertinite,and minerals.There are certain differences in the single component structure of coal.Different components,the macromolecular structure and nano-pore structure is not the same,will inevitably lead to coal adsorption and desorption characteristics are not the same.Therefore,the study on the macromolecular structure and pore characteristics of coal and rock components is of great significance for studying the heterogeneity of coal and guiding the development of coalbed methane.Based on this,based on the density centrifugation experiment,the enrichment of vitrinite and inertinite was obtained.The structure information of single component was obtained by XRD and Raman spectroscopy.The pore structure and fractal characteristics of the mass group are studied.Based on the above experimental research,this paper draws the following conclusions:?1?It was found that the optimal particle size range for each coal rank is:low coal rank coal samples,120-150 mesh?2h?;coal-grade coal sample,80-120 mesh?0.5h?;middle and high grade coal sample,80-120 mesh?0.5h?;high coal grade coal sample,80-120 mesh?2h?.?2?The trend of XRD crystallite parameters of vitrinite enrichment is basically consistent with that of primary structure coal.With the increase of coal rank,the change of surface net spacing d₀₀₂,stacking degree L_c and aromatic layer N_c has obvious stage,and finally Tends to be stable;ductility La and coal rank into a positive correlation,with the increase of coal grade and gradually increased.When R_o,max is less than 4%,the crystallite parameters of XRD of XRD are changed stepwise with the coal rank,after which the coal crystallites grow toward the aroma layer.?3?With the increase of coal ranks,the difference in the characteristics of the map between coal and rock components gradually decreases;from the low coal ranks to the medium coal ranks,the structure of homogeneous vitrinite,matrix vitrinite,and silk plastid differs greatly.The homogenous vitrinite has a significant change trend with the coal rank,but the macromolecular structure of the silkworm does not change significantly with the coal rank,and the macromolecular structure of the homogenous vitrinite in the same coal sample is also different.The half width of G peak of homogeneous vitrinite decreased with the increase of coal rank,while the half width of G peak of filamentous body did not change obviously with coal rank.The homogenous vitrinite D peak fitted The area increased gradually with the increase of coal rank,while the D-fitting area of silk plastids did not change much in the low to medium-high coal ranks,and suddenly rose when the coal ranks were high;the G-shape fitting area of the homogenous vitrinite was associated with coal.Gradual increase was gradually increased,and the fitting area of silk plastids at low coal ranks was not significantly changed.After a high coal rank,it suddenly increased,and the G-peak fitting area of silk plastids was higher than homogenous vitrinite.?4?In Dahuangshan,Daishucun and Zhaozhuang coal samples,the pore morphology of vitrinite enrichment is L1,and the parallel plate-shaped pores are dominant.The pores of 10-100 nm are also dominated by pores.The specific surface area of micropores is from The order of descending order is:vitrinite,coal,inertinite group;the specific surface area of transition pore descending order:inertinite group,raw coal and vitrinite.