W型火焰锅炉拱上燃尽风结构与布置的分析

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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