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时间:2020-03-26
《大同烟煤增压富氧燃烧过程中硫、氯和氟的析出特性.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42卷第9期燃料化学学报Vo1.42No.92014年9月JournalofFuelChemistryandTechnologySep.2014文章编号:0253-2409(2014)09.1053427大同烟煤增压富氧燃烧过程中硫、氯和氟的析出特性雷鸣,吕凯文,王春波,阎维平,王松岭(华北电力大学能源动力与机械工程学院,河北保定071003)摘要:利用高压热重结合傅里叶红外研究了大同烟煤在增压富氧燃烧过程中硫、氯和氟的释放行为,主要考察压力对其析出特性的影响。实验结果表明,压力的改变对煤中硫、氯和氟的迁移
2、转化均有显著影响。随着压力的升高,黄铁矿硫向COS等中间产物的转化率逐渐增加,导致SO:的收率逐步上升,但在31Y[Pa时,燃煤SO:收率却有所降低。此外,压力升高后反应气氛中CO分压的增加促进了COS的生成,导致其收率逐渐上升。因为煤中有机氯析出和转化与挥发分的释放密切相关,所以高压下挥发分释放量的增加使得煤中有更多的:机氯析出并转化为HC1,而且压力升高后,挥发分燃烧速率和温度的升高促进了无机氟化物分解,HF生成量相应增加。此外,高压下水解反应的强化也提高了HF的收率。关键词:增压富氧燃烧;煤;硫;氯;氟
3、;高压热重傅里叶红外联用中图分类号:TK123文献标识码:AInvestigationonsulfur,chlorineandfluorinereleasingcharacteristicsduringpressurizedoxy·fuelcombustionofDatongbituminouscoalLEIMing,LUKai-wen,WANGChun-bo,YANWei-ping,WANGSong—ling(SchoolofEnergyPowerandMechanicalEngineering,North
4、ChinaElectricPowerUniversity,Baoding071003,China)Abstract:Thereleasebehaviorofsulfur.chlorineandfluorineduringpressurizedoxy—fuelcombustionwasinvestigatedbyapressurizedthermogravimetficanalyzer(PTGA)combinedwithFourier订anSforminfrared(FT.Ⅱ)spectroscopy.inwh
5、ichtheinfluenceofpressureonthereleasecharacteristicswasmainlyfocusedon.Theresultsshowthatthechangesinpressurehavearemarkableeffectonthemigrationandtransformationofsulfur,chlorineandfluorine.TheconversionofpyritetoC0Sincreaseswiththeriseinpressure.whichleads
6、toanincreaseinSO,yield。butat3MPa.theSOyielddropssomewhat.Besides,theincreaseofCOpartialpressureathigherpressurepromotestheCOSgeneration.1eadingtoanincreaseinCOSyield.Becausethereleaseofchlorineiscloserelatedtothevolatileyield,theincreaseofvolatileyieldathig
7、herpressuremakesmoreorganicchlorinereleaseandconversiontoHC1.Moreover.theenhancedburningrateandcombustiontemperaturebyvolatilesathigherpressureacceleratethemineralfluorineresolving.andmoreHFisformed.Also.thehydrolyticreactionsarestrengthenedathighetrpressur
8、e.whichresultsinanincreaseofHFyield.Keywords:pressurizedoxy—fuelcombustion;coal;sulfur;chlorine;fluorine;pressurizedthermogravimetricanalyzercoupledwithFouriertransforminfraredspectroscopy由于经济的持续发展和改善生
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