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1、l:2003-05- 30Te:null(1978-),3,v?,V3b/Msnull,N!,.(v?,62250061)Knull1: 介绍了换热器污垢热阻的数学模型,包括污垢沉积模型和剥蚀模型b分析了换热器结垢工况下的换热系数的变化,重点研究了时间a流体雷诺数 Re 和流体 null 污垢界面温度Ts 对换热系数K 的影响,以及在结垢诱导期内换热系数K 的变化b得到了冷却水流速与污垢热阻之间的关系式,界面温度 Ts 与污垢热阻和换热系数之间关系的示意图,并得出了诱导期内的换热系数K 大于结垢过程的其他四个阶段的结论b最后,阐述了分析结果对工程的实际指导意义b1oM:结垢;模型;换热系数;热
2、阻ms|:TK124null null null null nullDSM:Anull null null null nullcI|:1004- 3950(2003)04- 0009- 05Variation of heat transfer coefficient and itsmathematic model for heat exchangers in conditions of foulingGAO Ming, SHUN Fong-zhong, HUANG Xing-yuan, SHI Yue-tao, WANG Na-i hua(SchoolofEnergy& DynamicEngi
3、neering, ShandongUniversity, Jinan250061, China)Abstract:This paper introduces themathematicmodel of heat exchangersnull fouling resistance, including deposit model andcorrosionmodel. Andanalyzes change of heat transfer coefficient, emphasizingtostudytheeffect of time, Re and surfacetemperatureTstoh
4、eat transfercoefficient, andthevarietyof heattransfercoefficient in inducementperiod. Thengettingtherelativeformulaof circularwatervelocityandfoulingresistance, thesketch mapof surfacetemperatureTs andfoulingresis-tance, heat transfercoefficient. Inaddition, drawingtheconclusionthat comparedtootherp
5、eriod, inducementperiodnull s heattransfercoefficient is higher. Finally, thepaperexpoundsthedirectionmeaningtofactualproject.Key words:fouling; model; heat transfer coefficient; heat resistance0null-nullBRC,i1a3bYVwV,)!Mfb1nullwLVSaaaKbS9HW,m1TDUbm1nullEHWMwLv4V,b8(,EHWMm11+Tb1L9,HW1Tb!b2q,EHWL19F,
6、9qv/,HWBtb3v,E)2003null?null - 9null -HWvL19F,KriBbL=HWMi?5,74*b7Ob8(,+4EC,m1L1Aa2Aa3AU;f(BHW=3b2nullVKrenSeaton2,V,BZ,V79FE,6BZ9i$87,PEhlCbEHWMCTF,qZVU:dmfdnull = nullmd - nullmr (1)nullmrKq, nullmdq,mfiqbqGT,aa,7Kq5aTa5=agM#d1b2.1 null 污垢沉积模型.pV:nullmd = Kr(Cs - Csat)n (2)DpV:Kr = Anull exp - E/ R
7、TTS (3)TVq:nullmd = Anull exp - E/RTTS (Cs - Csat) n (4)T: Cs null null null)i,kg/m3;Ts null null nullA%M, null ;Csat null null null Ts/H,i,kg/m3;n null null nullQ);Anullnull null nullD;E null null null?,kJ/(kgnullmol);RT null null null8a;Kr null null nullqb2.2 null 污垢剥蚀模型,VnullnullH,9nullMnull,bKVC
8、)gMTfnull1,1T3:nullmr = B0 nullwmfnull (5)nullw8vCY14b: nullw = f2 nullu2f = 0.0792Re- 0. 25T: nullw null null null8%8VgM,N/m2;nullnull null null8;B0 null null nullBb3nullEERfYy,V.A,y:&Kfxbv,Ev,9l,VVU:dRf null dxKfl,Ev,9lbTLs+Z_(s,5El:dRf null dmfnullfKf(6)T: nullf null null null;Kf null null null,W
9、/(mnullK);Rf null null nullE,(m2K)/Wb1D5,nullmdHW1H,nullmrmf1bNHT(1)Mdmfdnull = nullmd - B0nullwmfnull (7)|null= 0, mf = 0SHq,5(7)THs:nullmf0 1nullmd - B0nullwmfnulldmf =nullnull0dnull (8)null= T - TDb:mf = m* 1- enullnull0null (9)m* = nullmd nullB0nullw, null0 = nullB0nullw,vLZ6b(9)T(6)T1:)- null - ENERGY ENGINEERING 2003nullRf = R*f (1- enullnull0) (10)R*f = nullmd nullnullfKfB0nullwT(10),8(zVV-4/,HW979,OHW,9qh,m1wL3Ub4nullEKY5TT7,iH,9.EZ:R = 1K = 1h0+ d0hidj+ Rw + Rf (11)T:K null null null9,W/(m2 nullK);h0 null null null5b,W/(m2 nullK);h
