2018传热传质学年会集

学术会 周扬1，高明1,*，孙奉仲1，何锁盈1，史月涛（1.山东大学能源与动力济南( , [5]和赵顺安[6]建立了增加填料高度和淋水密度的数值模型，优化填料布置和配水方0.7K0.52K。高明等人[7]通过热态实验研究了冷却塔填料非均11000MW机组冷却塔设1/180，模型塔与原型塔主要的几何参1所示。塔内安装风机结构，其位于填料上方。主要目的通过实验研究强制通风条件2所示。 1实验流程12精KA31风速0-0-0-600-10-根据文献[14-15]分析，且本实验为热态模型实验，因此必须满足密度弗劳德数相 Fr

ΔgH/ ΔgH/ ΔgH/ FrΔ为密度弗劳德数；V00Δ为塔内外空气密度之差；He为有效高度；“P”、“M”VAVA

Q Q 式中，V为填料上方的气流出流速度；A为填料处的横截面积；ρ为空气密度；Q为循3℃WPp

p

5npp

m mm

Dmnm

pDp3 3

nmDm式中，P为风机功率，D为风机直径，n为风机转速，Q＇为风机通风量。根据式(3)、(4)3所示。GcwwQt1t2Kaia2ia1

蒸发水量系数；ρa为空气密度；ia1、ia2分别为进出塔空气比焓。2通风量随风机功率的变化规于3L/min，这主要是因为增加循环水流量，填料区和雨区的淋水密度增大，增大了通风阻0.4W26.0%1.2W66%。Merkel模型[16]的假设条件,Merkel模型计算冷却塔换热量，其定义式为

焓；i为湿空气的焓；A为水接触面积。33L/min3.6L/min循环水流量下，换热量与风机功率的关系曲线。换热量0.4W时，换热量的增加幅度逐渐减小，这是受3规0.4W1.2W11.5%；此时，相比于自然通风，换热量最大提0.4W1.2W时，换热量分别17.8%35.3%。t

3L/min3.6L/min4所示。由4水温降随功率的变化规3L/min的循环水流量下的淋水密度较小，单位体积散热量较大，因此，3L/min3.6L/min3.6L/min的相同。风机功率0.4W1.2W17.8%35.3%。5强制通风下，冷却塔热力性能极大提升。3.0L/min循环水流量下，风机功率达到率增加达到1.2W时，塔内通风量最大可提升60%左右，换热量提升35.3%，水温降提升约S.P.Fisenko,A.I.Petruchik,A.D.Solodukhin.Evaporativecoolingofwaterinanaturaldraftcoolingtower.InternationalJournalofHeatandMassTransfer,2002,45(23):4683-4694.J.Smrekar,J.Oman,B.Širok.Improvingtheefficiencyofnaturaldraftcoolingtowers.EnergyandManagement,2006,47(9-10):1086-金台,张力,唐磊.自然通风湿式冷却塔配水优化的三维数值研究[J].中国电机工程学报,2012,9-JINTai,ZHANGLi,TANGLei.Three-DimensionalNumericalStudyonWater-DistributionOptimizationinaNaturalDraftWetCoolingTower[J].ProceedingoftheCSEE,2012,32(2):9-15.MNAHawlader,BMLiu.Numericalstudyofthethermal-hydraulicperformanceofevaporativenaturaldraftcoolingtowers[J].AppliedThermalEngineering,2002,22(1):41-59.,):HUANGDongtao,DUChenqi.NumericalOptimizationonArrangementoftheFillingMaterialandSprayingWaterinCoolingTower[J].JournalofAppliedMechanics,2000,17(1):102-109.,:ZHAOShunan,LIAONei,XUMing.TwoDimensionalOptimalDesignofCounterFlowNaturalDraughtCoolingTower[J].ShuiLiXueBao,2003,10:165-168.MingGao,LeiZhang,Ni-niWang,Yue-taoShi,Feng-zhongSun.Influenceofnon-uniformlayoutfillingsonthermalperformanceforwetcoolingtower.AppliedThermalEngineering,2016,93:549-555.GaoMing,GuoChang,MaChaoqun,ShiYuetao,SunFengzhong.Thermalperformanceforwetcoolingtowerwithdifferentlayoutpatternsoffillingsundertypicalcrosswindcondition.Energies,2017,10(1).张磊,高明,陈友良,史月涛,孙奉仲.侧风对冷却塔通风性能影响的现场试验[J].中国电机工程学报,32(35):80-ZHANGLei,GAOMing,CHENYouliang,SHIYuetao,SUNFengzhong.FieldTestoftheEffectofCrosswindonVentilationPerformanceofaNaturalDraftWetCoolingTower[J].ProceedingoftheCSEE,2012,32(35):80-86.高明,王妮妮,史月涛,赵元宾,孙奉仲.自然通风湿式冷却塔冷却数随外界侧风变化规律的研究[J].机工程学报2012,32(1720-NumberforNaturalDraftWetCoolingTowerwithEnvironmentalCrossWind[J].ProceedingoftheCSEE,2012,32(17):20-24.蒋波,周兰欣.自然通风冷却塔加装十字挡风墙数值研究[J].汽轮机技术2010,52(03165-JIANGBo,ZHOULanxin.NumericalStudyofInstallingCross-windBreakonNaturalDraftCoolingTower[J].TurbineTechnology,2010,52(03):165-168.2012,32(11):28-CHENYouliang,SUNFengzhong,GAOMing,ZHAOYuanbin,SHIYuetao.ExperimentalStudyofCrossWallsEffectonthePerformanceofWetCoolingTowers[J].ProceedingoftheCSEE,2012,32(11):28-34.2012,32(23):48-CHENYouliang,GAOMing,ZHAOYuanbin,SHIYuetao,SUNFengzhong.ExperimentalStudyonOptimizingInletAirflowofWetCoolingTowersunderCrosswinds.ProceedingoftheCSEE,2012,32(23):MingGao,Feng-zhongSun,Ni-niWang,Yuan-binZhao.Experimentalresearchoncircumferentialinflowandvortexdistributionforwetcoolingtowerundercrosswindconditions.AppliedThermalEngineering,2014,64(1–2):93-100.MingGao,Feng-zhongSun,A.Turan.Experimentalstudyregardingtheevolutionoftemperatureprofilesinsidewet