低压省煤器在锅炉中的应用研究

上海交通大学硕士学位论文低压省煤器在锅炉中的应用研究姓名：李伟申请学位级别：硕士专业：机械工程指导教师：于立军;张伟20071201I670t/h20-30140MW,II3.765g/kw*h178.91:IIIAPPLICATIONANDRESEARCHOFTHELOW-PRESSECONOMIZERINPOWERSTATIONABSTRACTTheoverhighexhaustsmoketemperature(EST)isauniversalproblemforpowerstationboilersatpresent,whentheESTexceedsoverthedesignvalueverymuch,itnotonlyaffectsthethermaleconomicefficiencyofpowerstations,butalsoaffectsthesafetyandreliabilityofairpreheat;ithasagreatmeaningtodecreasetheESTforsavingtheenergy,promotingsafetyandreliabilityofboilers.TheESTofthe670t/hboilerofShengLipowerstationexceeds2030abovethedesignvalue,theboilerefficiencydecreasesbyalargescale,forthat,thepowerstationdecidedtoretrofittheboilertodecreasetheESTandincreasetheeconomy.ThispaperinvestigatesdeeplyallkindsofmeanstodecreasetheESTandexhaustsmokeloss(ESL).Atthesametime,thispaperintroducestheapplicationthingsofthelow-presseconomizerindecreasingtheESTandESL.Thelow-presseconomizernotonlydecreasestheEST,butalsodecreasesthecarbon-consumption;enhancetheoperationeconomyofboiler.Itplaysanimportantroleintheremainingheatreclaiminginthepowerplant.Thispapermainlyintroducestheprincipleofthelow-presseconomizer.Themathematicalmodelofoptimumdesignofthelow-presseconomizerwasestablished,theselectionoftheaimfunction,determinationofcontrolcondition,andmulti-optimumscanningwasdiscusseddetailunderthegiventheEGT,theoptimumarrangementandstructureparametersofthelow-presseconomizeraregained;theretrofitincomewascalculatedunderdifferentusagelivescoalpriceentrainsmoketemperature,IVitexplainsthatthemodelhasagooddynamicandeconomicstability.Itcanbeapplyforallkindsofoptimizationdesignworkoftheeconomizer.Atthesametime,thepapergivesdeepanalystisabouttheoptimizationoperationofthelow-presseconomizer.Thereisanwaterfluxwhichcanmakethewholeheatsystemreachingthehighesteconomyforthelow-presseconomizersystem.Movingfromtheoptimumwaterflux,thesystemeconomywillbedecreased.Atfirst,thistextestablishesthemathematicsmodelofseekingthebestfluxofthelow-presseconomizer.Then,thistext'scalculatingtargetisthelow-presseconomizerofWeiHaipowerstation's140MWunitinShanDong.Gatheringdatatothistargetbyengineeringtest.Thistextdoesaseriesofcalculationbyutilizingtheequivalententhalpylowerlawandfinallygetsoutthecalculationconclusion.Thistextwillcarryonheatingpoweranalysisbyusingthisimportantcomputingtechnologyofequivalententhalpylowerlawandobtainthebestdividingwaterflowfinally.Itcanbeapplyforallkindsofobtainthebestdividingwaterfluxofthelow-presseconomize.Thispapermakestheeconomicalanalysisforthelow-presseconomizer.Itisthestandardcoalconsumptioncanlessenabout3.765g/kw*h,thegainedthatincomeperyearisabout1.79*106Yuan,therecoverytimeoftheprogramisaboutoneyearandonemonths,theprogramhasahighratiovalueofinvestmenttoincome.Aftertheinvestmentreclaimingterm,thepowerstationwillbereclaimedforgreateconomicalbenefit.KEYWORDS:low-presseconomizer,optimumthemathematicsmodelequivalententhalpylowerlaw,thebestdividingwaterfluxVIIIDdkg/sD0kg/sQdwYkJ/kgWY%hd/hd/kJ/kgd,DdD0qdkJ/kgHkJ/kgHkJ/kgjj%jjkJ/kghyhykJ/kghdhdkJ/kgMyMykg/sDdDdkg/sBjkg/sty1,tpy,d0,mm0,mmf,mmhf,mmsf,mms1/s2/z1/z2/b,mmc,mmIXl,mmuv()P1/P2Tc,TH,Cb,/B,/Ey,/xn,Ch,kg/kJhq,kJ/kw*hHkJ/kgQkJ/kgkJ/kghm-1m-1kJ/kgCh/kw*hp%vy1m3/sPy1PaCr/kWN0kWCprprk/G0Wy,m/s/2Hd2tdc,XPyPaQj1kg,kJ/kgKw/(m2*)Am2t,qkj/kw*hdkg/kw*h%g%%qkj/kw*hbg/kw*hPkwSS0()hHTSHHightemperaturesuperheaterLTSHLowtemperaturesuperheaterHTRHHightemperaturereheaterLTRHLowtemperaturereheaterECONEconomizerIDfansInduceddraughtfansFDfansForceddraughtfansELPREElectrostaticPrecipitatorHPCHighpressurecylinderIPCIntermediatepressurecylinderLPCLowpressurecylinderHPHHighpressureheaterLPHLowpressureheaterDEADeaeratorBFPBoilerfeedwaterpumpXICEPCondensateextractionpumpCWPCirculatingwaterpumpCRHColdreheaterHRHHotreheaterUCBUpperconnectingboxLCBLowerconnectingboxSLVSSteam-leakageofValveStem11901949138127344451956126.31-2,370%-80%10-15,1%3-4g/kW*h4-5220MW153,90.1%203088.63%2200MW26:17-8:0.35-0.40.4-0.459-111-2.5%12-14()151-2%15-16.199227%4%41%17200MW22%,600MW336%18:19.1%0.7%0.1%20;21-22223-24253026-272028329-3031323343435-36200MW670th24.815.30C100500MW1651801402.53610-15600.2,1023738439-4041,42-43544454610-500.5-1.5475-100%-270%25%-35%10-2510-15,,48649650-5253-54:a.b.c.371155200MWDG670/13.7-8A,,2-1Fig2-1:SketchOfBoilers2-159930mm,11920mm,10880mm50*6,S=80mm,,50,,,377*36,,3400mm,,,,159*16128,60*6,60*6,120mm38*5,,,,,,,,,,,,,1600mm95mm21620mm52700mm661-32-4736mm,,,26m37m49m55m,,,922-12-1(t/h)670(MPa)13.72()540(t/h)588/(MPa)2.6/2.4/()321/540()245()340351()153(%)90.1388%(t)3049(t)280(t/h)86.4/(Pa)2648/981(MPa)1.498/0.245(MPa)0.193(Pa)981(Pa)1960(Pa)2452(%)51(%)4932-2102-2CY%56.89HY%2.83NY%0.98O2Y%2.4SY%1.08WY%9AY%26.82VY%13.72QdwYKJ/Kg22198.4K1.35SiO2%49AL2O3%35.88Fe2O3%6.83t11330T21500T31500256N220-12.7/535/535DG670/13.7-8AQFSN-220-22-211Fig2-2:SketchOfTurbing2-21N220-12.7/535/535220MW230MW12.7MPa5352.22MPa5353000r/min203325000t/h0.0052MPa(a)436.43t/h12550t/h638t/h569.51t/h244.13+1+48143kJ/kW.h22-32-3#1#2#3#5#6#7#8912151517202228/3325/30/35MPa3.892.52-1.250.840.430.240