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1、四角布置直流燃烧器锅炉燃烧调整CombustionadjustmentoffourcornerarrangementDCburnerboiler1,fourcornerburnerprinciplefficeffice7>Thedirectcurrentburnerisgenerallyarrangedonthefourcornetofthefurnace・Whenthepulverizedcoaljetflowsintothenozzle,itisadirectcurrentjetWhenthefoura
2、ircurrentsarriveatthecentralpartofthefurnace,theyconvergeintheformofatangentialcircle,Aswirlingcombustionflameisformed,andavortexflowfrombottomtotopisformedinthefurnace・1.1.Theworkingprocessofdirectcurrentburner:(1)theheatingprocessofpulverizedcoalairentra
3、inmentinhightemperaturefluegas:(2)theairsupplyandpressurebalanceprocessonbothsidesofthejet:(3)theignitionprocessofpulverizedcoalairflow;(4)themixingprocessofpulverizedcoalandtwoair;(5)thetangentialrotationprocessofairflow;(6)theprocessofcokeburning.Althoug
4、htheaboveprocessesareinsequenceorsomeprocessesatthesametime,theinteractionbetweentheprocessesisverysignificantProcessofentrainmentofhightemperaturefluegasbymainair.Theflowfromtheburnernozzlestillmaintainsahighvelocityflow.Becauseoftheturbulentdiffusionofai
5、rflowDrivethesurroundinghotfluegasforwardflow,thisphenomenoncalled''entrainment77〃・Asthe,,entrainment,/,thejetcontinuestoexpand,continuetofourZhouKuozhang・Atthesametime,thevelocityofthemainairflowdecreasesgraduallyduetoattenuation・Itisbecauseofthe,,entrain
6、ment,zeffectofthejet,thehightemperaturefluegasisformedTheheatflowiscontinuouslytransportedtothenewpulverizedcoalflowintothefurnace,andthepulverizedcoalf1owisheatedcontinuouslyandheatedup,whenthepulverizedcoalairstreamabsorbsWhenenoughheatisreachedandtheign
7、itiontemperaturebegins,thefirebeginsattheouteredgeoftheairflow,andthentheflamespreadsrapidlytothedeeplayeroftheairSteadystateofignition.1.2,theimpactoflightingeffectscomposedofairInatangentiallyfiredfurnace,thefourstrandairflowhasaselfignitioneffect・Onesid
8、eiscomposedofpulverizedcoalfireupstreamofthehightemperatureflamestraightTouchedandignited・Thisisthemainconditionofpulverizedcoalflowignition.Onesideofthebackfirealsorollsthehotsmokearoundthefurnacewall,butthi