ADSORPTION EXPERIMENT OF EXTRA-HIGH RANK COAL UNDER THE CONDITION OF EQUILIBRIUM MOISTURE CONTENT

In view of the gaps existing in the adsorptive characteristics research of extra high rank coal whose vitrinite has the maximum reflectance(R_o(max))of more than 4.0%,twelve coal samples(R_o(max)>4.0%)were collected systematically and conducted a high pressure and isothermal adsorption experiment under the condition of equilibrium moisture content,and the relationships between the Longmuir constant of extra high rank coal samples and R_o(max),maceral,specific pore volume or specific surface area were analyzed.It was found that inflection point on the curve of Longmuir volume vs.coal rank is around R_o(max)=4.5%.On the basis of above research,the adsorptive characteristics and mechanism of coal were discussed.