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1、低频振动对煤解吸特性的影响李树刚1赵勇1张天军2许鸿杰2(1.西安科技大学能源学院;2.西安科技大学基础课部;西安)摘要:为研究低频振动对煤解吸瓦斯性能的影响,研制了瓦斯解吸激振与测试系统。试验研究发现:在低频振动作用下,随着频率降低,解吸量和解吸速度就越大。针对这一现象,采用振动理论和瓦斯解吸速度的相关知识,对实验结果进行了分析研究。研究认为:低频扰动会导致煤的孔隙性变小,不利于瓦斯分子的解吸。因此吸附伴生分子虽然受到脱附能,由于扩散阻力的增大,解吸速度就较慢,解吸量就小。无扰动作用时,煤样的孔隙性没有改变,虽然吸附伴生分
2、子没有受到脱附能,解吸速度反而较快。这说明:低频振动使煤样的孔隙性减弱,增大了分子的自由程,导致分子在煤样中扩散变慢,同时增加了煤样的吸附位,从而减缓了在煤样中的解吸。关键词:低频振动;解吸;分子自由程;吸附位中图分类号:TD712文献标识码:AResearchtheparseeffectofexperimentandmechanismwhichgasamongcoalinlowoscillatefrequencyconditionLIShu-gang1,ZhaoYong1,ZhangTian-jun2,XuHong-jie
3、2(1SchoolofEnergy,Xi'anUniversityofScienceandTechnology;Xi'an,China2Dept.ofBasicCourses,Xi'anUniversityofScience&Technology;Xi'an,China)Abstract:Inordertoresearchtheparseeffectwhichgasamongcoalinlowoscillatefrequencycondition,theauthordesignagasabsorbvibrancyandtes
4、tingsystem.Theexperimentresearchshows:thelowerfrequencyofoscillation,theloweroffrequency,thelargerofdisengagequantityandtheslowerofparsespeed.Lowfrequency.withouttheoscillation,thebignessofdisengagequantityandthefasterofparsespeed.Low.Aimatphenomenon,adopttingthevi
5、brancyofenginetheoryandcorrelationknowledgeaboutthedesorptionspeedofgas.weexpansionaseriesofresearch.Theresultshow:withthedisturb,theholeofcoalturnsmall,disadvantagedesorption.Thereforeabsorbpartermoleculegetmissoutenergy,becausepervasionresistanceturnslarge.theslo
6、werofparsespeedandthesmallerofdisengagequantity.withoutthelowfrequencydisturb,theholeofcoalshapekeepthesamemakeforthegasdesorption.absorbpartermoleculedoesnotgetmissoutenergy.Parsespeedshowfast.Itmakesoutthatfrequencyoscillatereducetheholedensityofcoalmodel,increas
7、ethedisengagementdegreeoffiredampmolecule,thatmakesfiredampmolecule’sdiffusionslower,andincreasestheadsorptionsiteofcoalmodelatthesametime,whilethecoalmodel’sdisengagespeedanddisengagequantitybecomeslowerandsmaller.Keywords:lowoscillatefrequency;disengagequantity;m
8、oleculediffusiondegree;adsorptionsite.1引言煤层瓦斯解吸特性除了与煤体的孔隙性,煤质等煤体本身性质有关外,还受到地电场、地应力、地温、以及人为采掘活动影响。研究不同因素影响下煤体的瓦斯的解吸特征,对于认识煤层瓦斯的运移,以及瓦斯突出机理,煤层气开采等都