化工原理-再沸器计算(最终)

壳程水蒸气冷凝温度100℃潜热rc2319.2kJ/kg黏度μc0.283mPa*s管程釜液温度53℃潜热rb310kJ/kg液相黏度μb0.07mPa*s液相比定压热容Cpb3.44kJ/(kg*K)汽相黏度μv0.0088mPa*s蒸汽压曲线斜率(△t/△p)s0.000226m2*K/kg传热温差△tm47℃再沸器热流量Q2075530.94W传热管规格(外径d0)38mm传热管数NT102.7532084110壳径Ds614.5026232800进口管直径Di250mm出口管直径D0350mm传热管出口处汽化率xe0.241传热管内质量流速G473.6216072kg/(m2*s)2蒸汽冷凝的质量流量Dc0.894934003kg/s冷凝液膜的Re0963.248670421003污垢热阻及管壁热阻沸腾侧Ri0.0001764显热段传热系数KL821.310141W/(m2*K)1传热管内釜液质量流速Gh1.705037786kg/(m2*h)xe=0.24时1/Xtt1.096681074查图3-29αEx=0.4xe=0.096时1/Xtt0.411258594查图3-29α'2泡核沸腾压抑因数α0.2泡核表面传热系数αnb1614.075571W/(m2*K)34对流沸腾因子Ftp2.244530637沸腾表面传热系数αv5097.37523再沸器的选用立式热虹吸式再沸器以液体单独存在为基准的对流表面传热系数αi估算设备尺寸传热系数校核显热段传热系数KL显热段传热管内表面传热系数αi管外冷凝表面传热系数α0蒸发段传热系数KE5沸腾传热系数KE1068.84968312显热段的长度LBC0.144578199m1传热系数Kc1060.8966122实际需要传热面积Ac41.625387683传热面积裕度H0.41964700130%1x=xe/3=0.08时Xtt2.9107545972x=xe=0.24时Xtt0.9118421243查表3-19根据焊接需要取l1.024循环系统的推动力△pD10199.61819Pa1853.579805429.298644221458.6334812473.62160720.01935044222.5417433G=75.779457150.018730423243.9942325397.842150.015710333389.01644034963.01150942.9442210651518.2530885435.49990074157044.50756.66054278管程出口管中汽相质量流动雷诺数Rev管程出口管汽相流动阻力△pV5汽相流动阻力△pV5的计算管程出口管中汽液相总质量流速G管程出口管的长度与局部阻力的当量长度之和l'蒸发段程管内因动量变化引起的阻力△p4传热管内液相流动的摩擦系数λL传热管内液相流动阻力△pL3传热管内两相流动阻力△p3蒸发段管内因动量变化引起的阻力系数M传热管内汽相流动的摩擦系数λv传热管内汽相流动阻力△pv3液相流动阻力△pL3的计算液相在传热管内的质量流速GL进口管内流体流动的摩擦系数λ传热管显热段阻力△p2汽相流动阻力△pV3的计算汽相在传热管内的质量流速Gv釜液在传热管内的质量流速G循环系统的推动力进口管长度与局部阻力当量长度Li管程进口管阻力△p1循环阻力釜液在管程进口管内的质量流速G传热面积裕度循环流量校核显热段LBC和蒸发段LCD的长度显热段的长度LBC与传热管总长L的比值LBC/L330.97992450.01553897228.01315621931.6046119894.044432Pa1.0308846161.01---1.05管程出口液相流动阻力△pL5管程出口管中两相流动阻力△p5系统阻力△pf循环推动力与循环阻力的比值△pD/△pf液相流动阻力△pL5的计算管程出口管中液相质量流速GL管程出口管液相流动摩擦系数λL热导率λc0.683W/(m*K)P1820000密度ρc958.4kg/m3液相热导率λb0.1387W/(m*K)液相密度ρb435kg/m3表面张力σb0.0045N/m汽相密度ρv30kg/m3蒸发质量流量Db10.056kg/s传热系数K800传热面积Ap55.20029096m2厚度δ3mm长度L4.5m管心距t47.5mmb11.5368973L/Ds=5(4-6)5.625循环流量Wt41.9kg/s雷诺数Re216512.7347普朗特数Pr1.7361212306.073174W/(m2*K)0.068151/(m*s)6276.025772W/(m2*K)m2*K/W冷凝侧R00.00028m2*K/W管壁热阻RW0.00005m2*K/W00.9118421240.42.4315601282127.19757W/(m2*K)4774.560116W/(m2*K)立式热虹吸式再沸器传热管外单位润湿周边上凝液质量流量M显热段传热管内表面传热系数αi两相对流表面传热系数αtp0.032128489蒸发段LCD长度4.3554218010.346424302170.30180.199074417110.6251kg/(m2*s)雷诺数Rei3048499.305m摩擦系数λi0.01486174Pakg/(m2*s)雷诺数Rei216512.7347Pa473.6216072kg/(m2*s)kg/(m2*s)雷诺数Rev275561.6624Pakg/(m2*s)雷诺数ReL1446698.727PaPakg/(m2*s)104.519976kg/(m2*s)40.78699237m0.01457359Pa管程出口管汽相流动摩擦系数λv管程出口管中汽相质量流速Gv两相流的液相分率RL两相流平均密度ρtp两相流的液相分率RL两相流平均密度ρtpkg/(m2*s)1654899.62PaPa管程出口管中液相质量流动雷诺数ReL