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时间:2020-03-26
《微细腔内甲烷湿空气低温重整积炭特性的热力学分析.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39卷第10期燃料化学学报Vo1.39No.1O2011年10月JournalofFuelChemistryandTechnology0ct.2011文章编号:0253—2409(2011)10-0759-07微细腔内甲烷湿空气低温重整积炭特性的热力学分析冉景煜,赵柳洁(重庆大学动力工程学院,重庆400044)摘要:微细腔内重整积炭会引起催化剂失活和孔道堵塞,甲烷低温自热重整技术的提出,既有利于实现微燃烧器中甲烷的持续稳定燃烧,又能有效降低热点和减少积炭。通过热力学分析,探讨常压下反应温度低于973K时微细腔内自热重整积炭的影
2、响因素及重整特性。结果表明,温度、空碳比及水碳比对积炭生成有重要影响。微细腔内积炭含量随温度升高先增大后减小;贫氧环境下,空碳比和水碳比的增加不仅对减少积炭有效,对氢气产生也有利;同时,甲烷自热重整系统与无水系统相比减碳性能优越。甲烷质量流量为6.6g/h、空碳比和水碳比分别为2和1时,积炭产生的温度为680K~850K,并在785K达到积炭质量分数的最大值为0.66%,此时甲烷转化率和氢气质量含量分别为53.43%和2.37%;且消碳对应的空碳比和水碳比分别约为2.4和1.1。关键词:微细腔;白热重整;积炭;无水系统;热力学分
3、析中图分类号:TK123文献标识码:AThermodynamicanalysisofcarbondepositionformethanereformingatlowtemperatureinmicro-combustorRANJing—yu,ZHAOLiu-jie(CollegeofThermalPowerEngineering,ChongqingUniversity,Chongqing400044,China)Abstract:Carbondeposifioncausedbyreforminginmicro.combustor
4、bringscatalystdeacfiv~ionandchannelsnarl—up.Thetechnologyofmethanewet—airautothermalreformingispresentedtorealizemethanelast,steady-statecombustionandtoreducecarbondeposition.Theeffectsforcarbondepositionbelow973Karediscussedbythermodynamicanalysisat0.1M【Painthispape
5、r.Resultsshowthattemperature.airmethaneratioandsteam—methaneratiocontributealottothecarbondeposition.Inmicro—combustor.carbondepositionincreaseswithtemperatureincreasingfirst,thendecreases;itisbeneficialtoreducecarbondepositionaswellastoproducehydrogenwithairandsteam
6、increaseunderleanoxygen;attheSalTletime,autothermalreformingcomparedwithnon—steamsystemissuperioronreducingcarbondepositioninmicro.combustor.WhenmethanemassflOWis6.6g/h,air—methaneratioandsteam.methaneratioarerespectively2and1inmicro—combustor,thecarbondepositiontemp
7、eraturerangeisat680K~850K.Thelargestmassfractionofcarbondepositionis0.66%andoccurredat785K,alSOthemethaneconversionrateandthemassfractionofhydrogenareapproximately53.43%and2.37%:andthat,requirementsofair.methaneratioandsteam—methaneratiotoeliminatethecarbondeposition
8、areabout2.4and1.1respectively.Keywords:micro—combustor;autothermalreforming;carbondeposition;non—steamsystem;thermodynamicanalysis随
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