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medium;">T3- Initial temperature of sample cylinder units ofmeasurement (K);V1- System total volume unitsof measurement (cm3);V2- Reference cylinder volumeunits of measurement (cm3);V3- Sample cylinder volumeunits of measurement (cm3);Z1- Gas compression factorunder the balance condition, dimensionlessZ2- Initial gas compressionfactor of reference cylinder, dimensionlessZ3- Initial gas compressionfactor of sample cylinder, dimensionless After getting the coal samplevolume, calculate the free space volume of sample cylinder. FreeSpace Volume refers to the sum of various volumes that coalparticle space after the coal sample put into the sample cylinder,micro-flow gap of internal coal particle size, the remaining freespace of sample cylinder, and connection tube and internal spacevolume. Calculation formulas of free space volume asfollows:Vf- Free space volume, unitof measurement (cm3)V0- Total volume of samplecylinder, unit of measurement (cm3);Vs- Coal sample volume, unitof measurement (cm3);Z3- sample cylinder initialgas compressed factor, dimensionlessCalculation theabsorption capacity of each pressure spotAccording to balance pressureand temperature of reference cylinder and sample cylinder,calculate adsorption capacity of different pressure spot Formulasas follows PV=nZRT P-Gas pressure, unit ofmeasurement (MPa)V- Gas volume, unit ofmeasurement (cm3);n- Gas mole number, unit ofmeasurement (mol)Z- Gas compressor factor,dimensionlessR- Molar gas constant, unitof measurement (U·mol-1·K-1)T- Thermodynamic temperatureunit of measurement (K) Respectively obtain the gasmole number of inner sample cylinder before pressure spot balanceand after balance, the gas mole number of sample cylinder (N2),mole number of coal sample adsorption of gas (ni)Ni=n1-n2 ni- Gas mole number, unit ofmeasurement (mol)N1- Sample cylinder‘s gasmole quantity after balance, unit of measurement(mol).N2- Sample cylinder‘s gasmole quantity after balance,, unit of measurement(mol).Adsorption gas volume of eachpressure spotVI=ni * 22.4 *1000 The gas volume of eachpressure spot adsorption: V adsorption=V i/cV-adsorption- Adsorptioncapacity, unit of measurement (cm3/g)-total volume of adsorptiongas, unit of measurement (cm3/g)-coal sample weight, unit ofmeasurement (g)Data Calculation andReportAdsorptionIsothermAccording to adsorptioncapacity of each balance pressure V and pressure F drew theadsorption isotherm.ExperimentPrecision5.1RepeatabilityVL repeatability of relativeerror less than 15%PL repeatability of relativeerror less than 15%5.2ReproducibilityVL reproducibility ofrelative error less than 20%PL reproducibility ofrelative error less than 20%5.3 Sample experimentalweightRelated coefficient R of P/Vand P is greater than 0.98Sample experimentalqualityP/V and its relativecoefficient R >0.98
