锅炉给水泵迷宫式最小流量调节阀流动性能的试验研究

:100225855(2008)0220019204:(1982-),,,,,(,200093)DRAG,,GB10869-89GB/T4213-92,,;;;;:TK223152:AExperimentandresearchofflowcharacteristicofDRAG2LabyrinthminimumflowcontrolvalveofboilerfeedwaterpumpZHONGFang2sheng,JIANGXu2ping,CHENMing2tao(CollegeofpowerEngineering,UniversityofShanghaiforScienceandTechnology,Shanghai200093,China)Abstract:Therequirementandproblemofminimumflowcontrolvalveoftherecyclingsystemoffeedwaterpumpofboilerinpowerplantwasanalyzed.TheDRAG-Labyrinthminimumflowcontrolvalvewasusedinordertoraisetheflowresistancecoefficient,ofvalve.Thereduceofpressureofminimumflowcontrolvalvewasmultistageandsmooth;theabilityofflowregulatingwasimproved.TestsystemwasdesignedaccordingtoGB10869-89andGB/T4213-92.theinherentflowcharac2teristicandresistancecharacteristicofvalvewastestedbywaterloop.Animportantbasistoverifythetheoreticalcalculation,themorein-depthinternalcharacteristictestingandflowvisualizationexperi2mentsofvalvewasprovided.Keywords:feedwaterpump;labyrinth;controlvalve;flowcharacteristic1,(),(35MPa),,,,(10),,,300MW,,,,,,,,DRAG()(1),,,,,,,,9120082=f(lL)(1)CvCcmaxlL,,,,,1Drag212,,,=2pV2=2pA2Q2(2)p,Pa,kg/m3V,m/sA,m2Q,m3/s213GB/T10869-1989GB/T4213-1992,(2),,,,,,,Re105,,,CvCv=10Qp0(3)Q,m3/hp,kPa/0(1)112131415161718191101111121131::LWGY-50,015,440m3/h:YSZ-100,,015,115:0215MPa:420mA(DC):-1070:015%/10:wzpk,pt100,AB23,,,,140220082(%)9111812271336144515541563167217811890191003189511471601312518181211832516829150341253915151133(%)71591010014182251813616442153501035714766173791971002L(%)1020304050607080901000196211631905143615381059140101541214113129(%)712216127291354018349116601577017579134931361003L(%)91118122713361445155415631672178118901910018821082493181621780175919431332182413181310184L(%)102030405060708090100108412138656169339128234116154128113107891906419356160341220082(2),,4(2)d=2A2Q2dp+4pAQ2dA-2pA22Q2d-4pA2Q3dQ=d=p2+(2A)2+p2+(2Q)2(4)p,%A,%(),%Q,%,(015%),,,p1=p2=32015%=0175%p=P1-P2,P=P1+P2P1-P2P1P1=1113MPa,P2=0120135MPa,p1125%,011mm,50mm,A=201150100%=014%281535,011114MPa,9981384kg/m3,9941088kg/m3,,=0122%Q=32015%=0175%(4)=11252+(2014)2+01222+(20175)2%=2112%310%310%412(3)Cv=dCv/Cv=Q2+(015P)2+(015)2=01752+(0150175)2+(0150122)2%=01846%110%110%5,,,30%80%,0131%,30%,310%,110%,,,,5,,1.FT968YJ.,1996(1).2GB/T4213-1992,S.3GB/T10869-1989,S.(:2008101121)2220082