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《可溶有机质对煤低温氧化的影响.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第38卷第10期煤炭学报Vol_38No.102013年lO月J0URNALOFCHINACOALSOCIETY0ct.2013文章编号:0253-9993(2013)10—1806—06可溶有机质对煤低温氧化的影响杨永良,李增华,季淮君,刘震,张亮(1.中国矿业大学安全工程学院,江苏徐州221116;2.中国矿业大学煤矿瓦斯与火灾防治教育部重点实验室,江苏徐州221116)摘要:为了揭示煤中可溶有机质对煤自燃的影响规律,利用红外光谱和GC/MS实验测试了经四氢呋喃抽提后煤表面微观结构变化及抽提产
2、物成分,结合可溶有机质影响煤体孔隙结构的测试结果,在研究抽提前后煤体的低温氧化气体产物释放规律的基础上,探讨了可溶有机质对煤表面活性结构和煤低温氧化规律的影响。结果表明,抽提后残煤的羟基和羧基碳的含量降低,含氧量高且性质活泼的侧链及官能团减少,矿物质含量下降;煤中可溶有机质含有大量的甲基、羟基、羰基、醚基等活性基团;残煤总孔体积和比表面积均有不同程度的增加,平均孔径由原煤的6.3nm减小至4.9nm;抽提残煤在低温氧化阶段的耗氧量明显低于原煤,且CO,CO:,CH和cH气体的释放量较原煤有不同程度
3、的降低,可见可溶有机质的存在对煤自燃有较大的促进作用。关键词:可溶有机质;溶剂抽提;微观结构;低温氧化中图分类号:TD530.2文献标志码:AEffectofsolubleorganicmatteronthelow-temperatureoxidationofcoalYANGYong.1iang,LIZenghua一,JIHuai-jun一,LIUZhen,ZHANGLiang,(1.SchoozSa#tyEEneering,ChinaUniversityoJMiningandTechnology
4、,Xuzhou221116,China;2.KeyLaboratoryofGasandFireControzforCoalMines,ChinaUniversityofMiningandTechnology,Xuzhou221116,China)Abstract:Inordertorevealthesolubleorganicmattereffectonthespontaneouscombustionofcoal,theinfraredspec—troscopyandGC/MSexperiment
5、swereusedtotestthechangesofcoalsurfacemicrostructureandproductingredientsafterextractedbytetrahydrofuran.Basedontheresultsofsolubleorganicmatteraffecttheporestructureofthecoal,andaccordingtothegas—productreleaselawoflowtemperatureoxidationofcoalbefore
6、andaftertheextraction,effectofsolubleorganicmatterofthecoalonsurfactantstructureandlowtemperaturecharactersofcoaloxidationwasdis—cussed.Theresultsindicatethatafterextraction,thecontentofhydroxylandcarboxylinresidualcoalisreduced.Meantime,mineralconten
7、tandactivesidechainsandfunctionalgroupswhichinvolvehigh—contentoxygenincoalalsoreduce.Coalsolubleorganicmattercontainsalargeamountoftheactivegroups,suchasmethyl,hydroxyl,carbonylandetheretc.Thetotalporevolumeandsurfaceareaoftheresidualcoalisincreasedi
8、nvaryingdegrees.Theaverageporesizeofresidualcoalreducesfrom6.3nmto4.9nm.Theoxygenconsumptionofextractedresidualcoalinlow—temperatureoxidationstageissignificantlylowerthanthatofrawcoal,andCO,CO2,C2H4andC2H6gasemissionre—ducedthanrawcoaltosomeex
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