管道系统中局部阻力计算

132021,,,,,3-K:CalculationofLocalResistanceForceinPipelineSystemWangGuiqiuChemicalFertilizerPlant,JilingChemicalIndrustryCo.JilinJilin132021Abstract:Therearemanycalculatingmethodsforthelocalresistanceforeeinthepipelinesystem,butitisusedundernormalconditionstheequivalentlengthmethodandtheresistaneecoefficientmethodBecausethelaminalorturbulantproperryofthefluidinthepipefttingsandvalvesisdiffeventfromthatinstraightpipeiftheequiralentlengthmethodwouldtheresistancerelicfofthepipefittingsbenataceurateevalatedandtheresistancereliefisdependedontheReynoldscoeficientandthepipefittingssizes,thenthesingleconstantresistancemethodisnotaccurateenoughtoo.Itispointedoutthe3K-equationcanmoreaccuratecalculatetheresistancereliefinpipefittings.KeyWords:Pipline,LocalResistaaceeForce,LossCoefficient,FrictionCoefficient,Calculation.1,hfP,VsDHe-hf=Z+V2/2g(1)hf=L+le)/DV2/2g(2),,V,m/s;g,9181m/s2;Z,m;L,m,,,,,:,,,2,():P/+g+(aV2)/2+ef+w=0(3),,g,1kg/cm3;P,kg/cm2;ef12,m2/s2;52w123(),Kf:ef=iKfiVi2/2(4)Lf:Kf=4fL/D(5)=4f,311Kf,,()KfKf312(Le/D),,,Le/D11Le/DLe/DLe/D4516()89030()860()145()300(5),f,,,(:fNRe),313Hooper2-K()Hopper2-K()2-K:Kf=K1/NRe+K(1+1/ID)(6)311312,Hooper2-K,ID;NRe,2-K,,:Kf=Km/NRe+Kn(7)Km(6)K1,Kn(6)(7)22(mm)122025385076100150200250300Km90r/D=1108500152014801450140013801350133013001280127012690r/D=1158500136013401310128012701240123012101200119011845r/D=1104500137013401320129012701250123012101200119011845r/D=11545001240122012101190118011601150114011301130112()30001080107010701060106010501050104010401040104()13001200116011201090107010501040104010401040104850111511060199018701810172016701590155015101498501120112011201120112011201120112011201120112015001340130012601220119011601140112011001090109:Km,Kn3143-K(3)3-K()Kf=Km/NRe+Ki(1+Kd/ID013)(8)(KmKiKd)3383KmKiKdr290r/d=11085001096316401998390r/d=11585001069314901995945r/D=11045001064319501998145r/D=1154500104663143019958()3000101144191019748()130-01086-215001923985001068313121019970850-01082-4118019968620003Km2,Hooperr219024512,3-K90453434,3-K,12(8)3,Kn=112,44:5m,1090,10,830m(25300mm),115(4)ef,(9)(3),:Q=D2/(22015)(-gZ/iKfi+115)015(9)(Moody)4,5(8)3-K4566/K(L/D)eqK1K90r/d=11001753080001490r/d=115014520800018245r/D=11001351650001245r/D=1150120105000115()011783000110()0117830001101106050001100142020011105(m3/h103)NRe5688(mm)271117301643015301492396412176311856118171159830534158314831633110125210217137131661712141329701543913628196471693718552402067017854113971657513277402601121798913317017128131055031116018613015825916519216613100(18)724,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,1..,1998(11):64672...1999(4):41463...1999(2):2125(:1999124)(7)5,,,L/D,2-K,,3-K:D,mm;ef12,m2/s2;f;g,9181m/s2;ID,mm;Kd8Kn;Kf;Ki8Kn;Km7;Kn7;K16;K6;L,m;NRe;Q,m3/h;V,m/s;Vi,m/s;W12;P,kg/cm2;,m;,kg/cm2;r21,,.().:2.:3AIChECenterforChemicalProcessSafety,guidelinesforPressureReliefandEffluentHandlingSystems,pp.265268,NewYork,1998.4Darby,R.ChemicalEngineeringFluidMechanics,pp.196-201,MarcelDekker,NewYork,1997.5CraneCo.FlowofFluidsthroughValves,FittingsandPipe,CraneTechnicalManualNo.410,NewYork,1982.6Hooper,W.B.TheTwo-KmethodPredictsHeadLossesinPipeFittings,Chem.Eng.,88,17,p.97-100.August24.1981.7Hopper,W.B.CalculateheadlossCausedbyChangeinPipeSize,Chem.Eng.,pp.89-92.November,7,1988.8Perry,R.H.andGreen,D.w.PerrysChemicalEngineersHandbook,7thed,.P,6-18,McGraw-Hill,1997.(:19991010)812000