Research status and engineering application of competitive adsorption of multicomponent mixed gases in coal

Adsorptioncharacteristicsofgasesincoalarethebasisofresearchonpreventionandcontrol ofdynamicdisastersofmethaneincoalmineandECBMengineering.Coalbedmethanecontainsnot onlyCH4,butalsoCO,CO2,H2Sandotheralkanes.Furthermore,intheprojectsofenhancedcoalbed methanerecoverybygasinjectionandpressuremeasurementbygasinjectionactivelyofcoalseam, competitiveadsorptionbehavioroccursduetothedifferenceadsorptioncapacityofdifferentgasesin coal.First,themechanismofcompetitiveadsorptionofgasincoalwasanalyzed.Themulti-component gasadsorptionequilibriumpredictionmodelincoalporousmediawascomparedandanalyzed.Theinfluencingfactors,characteristicsofadsorptionswellingandadsorptiondynamicbehaviorofcompetitive adsorptionwerediscussed.Second,thephenomenonofpermeabilitydecaycausedbytheswellingdeformationintheprocessofCO2-ECBM,thederivedoutburstdisasterriskandthesupercriticalCO2adsorptionwerediscussed.Finally,theadsorptionequilibriumpredictionmodelofmulticomponentgasesin coal,theengineeringapplicationofcoal-rockdynamicdisasterprevention,ECBMandPSAtechnology werediscussed.