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ID:39111686
大小:1.50 MB
页数:57页
时间:2019-06-25
《W型火焰锅炉拱上燃尽风结构与布置的分析》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、哈尔滨工业大学工学硕士学位论文入炉膛中部,因而和煤粉的混合变差,混合点升高。关键词燃尽风;W型火焰;NOx;冷态模化;数值模拟II哈尔滨工业大学工学硕士学位论文AbstractTheconfigurationandcollocationofOFAindown-firedboilerwerestudiedbyexperimentsandnumericalsimulationinthepaper.AnIFA300constanttemperatureanemometerssystemwasusedtomeasuretheairvelocityatthemeasurementp
2、ointsincoldaerodynamicexperiments.TraceglycolwasusedtoacquirethecontrailofOFAinthetraceexperiments.NumericalsimulationwascompletedbyFLUET.AnadditionofOFAabovethearchindown-firedboilerforthelow-NOxemissionwilldecreasethesecondaryair.Thiswillinfluenttheairvelocityoffuel-burningzoneandthecom
3、bustionoftheboiler.Thusit’sessentialforstudyingtheairvelocityoffuel-burningzonebeforeinstallingOFA.Thecontentsmainlycontaintwosituations:theangelofthesecondaryairjetwas0andtheangelofthesecondaryairjetwas25.IntheexperimentweusetheOFAjetformedbytwopipesinwhichtheairwasvorticalintheouterpipe
4、andtheotherwasstraight.FourexperimentswerecompletedbyarrangingtheproportionofOFA,10%,20%,30%,40%.Whentheangelofthesecondaryairjetwas0,theprimaryairstillformedW-shapeairflowinthefurnacealongwiththeproportionofOFAincreased.Anditalsoincreasedtheburn-outrate.Whentheangelofthesecondaryairjetwa
5、s25,theaerodynamicfieldinthedown-firedfurnacehadfewchange.Andtheprimaryaircouldreachthebottominthefurnace.It’snecessarythattheOFAaircouldblendintotheotherairinthefurnacewheninstallingtheOFApipes.ThestandardisthecontrailoftheOFAbywayoftraceglycol.Thustheemphasesistheeffectoftherate,theange
6、landthestructureoftheOFA.Therearethreekindsofstructureintheexperiments:onepipefromwhichthejetisstraight,twopipesinwhichtheairwasverticalintheouterpipeandtheotherwasstraight,FWpipe.Fromthetracephotographswecanconclude:therateis20%atlowest,thebestangelis30,thebeststructureisthesecondkindinw
7、hichthevaneshouldbecurving.Thenumericalsimulationofgas-solidflowwascarriedoutbyLagrangestochasticparticletrackingmodel.TheinfluencesoftherateandtheangeloftheOFAonthetemperaturedistributioninthefurnace,theburn-outrateofthecoalIII哈尔滨工业大学工学硕士学位论文powderandNOxemissionwer
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