煤中多组分混合气体竞争吸附研究现状及工程应用

煤对气体的吸附特性是煤岩瓦斯动力灾害防治、提高煤层气采收率(ECBM)等研究的基 础。 煤层气中不仅含有CH4,同时含有CO、CO2、H2S以及其他烷烃类气体。 在注气开采煤层气 和煤层主动式瓦斯压力测定等工程中,不同气体由于吸附能力的差异会发生竞争吸附行为。 首 先,分析了煤中气体竞争吸附的机理,对比分析煤基质中多组分气体吸附平衡预测模型,并探讨 了竞争吸附的影响因素、吸附膨胀特性以及吸附动力学行为。 其次,结合现有研究阐述了CO2ECBM过程中的煤层渗透率降低、衍生的突出灾害风险以及超临界CO2 吸附等问题。 最后,对煤 中多组分气体吸附平衡预测模型、煤岩动力灾害防治、ECBM及PSA变压分离技术等工程应用进 行了探讨。

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.