螺旋管式換熱器設(shè)計(jì)參數(shù)計(jì)算

,,,,,,,,,,,,,

,一、工藝參數(shù),,,,,,,,,,,

,1.1管程介質(zhì),,,,,,,,,,定性參數(shù),

,介質(zhì)名稱,柴油,進(jìn)口溫度t1℃,20,出口溫度t2℃,125,質(zhì)量流量Wtkg/h,8935.2,0.17,m3/min,管程介質(zhì),

,粘度μkg/m·h,91.375,比熱Ckcal/kg·℃,0.4811446,導(dǎo)熱系數(shù)kkcal/m·h·℃,0.106554,密度ρkg/m3,876,,,平均溫度t平℃,72.5

,進(jìn)口壓力P1MPa,75,允許壓降△PKpa,6000,預(yù)測(cè)的出口壓力P2MPa,69,所需傳熱量Qkcal/h,451407.9391,,,殼程介質(zhì),

,污垢熱阻rikcal/m2·h·℃,0.000614096,管道絕對(duì)粗糙度εmm,0.4,,,,,,,,

,1.2殼程介質(zhì),,,,,,,,,,界膜溫度t膜℃,123.75

,介質(zhì)名稱,水蒸汽,進(jìn)口蒸汽溫度T1℃,175,進(jìn)口蒸汽壓力P3MPa,0.8,出口冷凝水溫度T2℃,175,,,,

,冷凝水粘度μfkg/m·h,0.80129,冷凝水密度ρfkg/m3,940.027,冷凝水導(dǎo)熱系數(shù)kfkcal/m·h·℃,0.59048,冷凝潛熱qkcal/kg,500,,,,

,重力加速度gm/h2,127000000,所需冷凝液量Wfkg/h,902.8158783,污垢熱阻r0kcal/m2·h·℃,0.000204699,,,,,,

,1.3蛇管結(jié)構(gòu),,,,,,,,,,,

,材質(zhì),CT90,蛇管外徑D0m,0.0318,蛇管內(nèi)徑Dim,0.023,蛇管螺旋徑DHm,1.5,,,,

,蛇管螺旋間距Pt（1.5-2*D0)m,0.04,蛇管根數(shù)N,1,每根蛇管圈數(shù)N0,70,每根蛇管長(zhǎng)度Lm,329.8672286,,,,

,每根蛇管高度m,2.8,每根蛇管換熱面積Am2,32.9546091,殼側(cè)容器內(nèi)徑Dm,1.7,殼側(cè)容器筒體長(zhǎng)度Hm,3.5,,,,

,導(dǎo)熱系數(shù)Kwkcal/m·h·℃,43,,,,,,,,,,

,二、管程對(duì)流傳熱系數(shù)hi,,,,,,,,,,,

,管內(nèi)質(zhì)量流速Gi=4Wt/(πDi2）=,,21505954.59,kg/m2·h,雷諾數(shù)Re=Di·Gi/μ=,,5413.263537,,,,,

,Di/DH=,,0.015333333,,Pr=Cμ/k=,,412.6038236,,,,,

,（Di·Gi/μ）·（Di/DH）1/2=,,670.3127174,,（Re）crit,,5253.318115,5520.21152,,,,

,2.1德雷為德方程（層流）,,,,,,,,,,,

,,,,,233.7735832,,kcal/m2·h·℃,,,,,

,,,,,,,,,,,,,

,2.2西班方程（湍流）,,,,,,,,,,,

,,,,,251.156885,,kcal/m2·h·℃,,,,,

,,,,,,,,,,,,,

,三、殼程對(duì)流傳熱系數(shù)ho（冷凝傳熱）,,,,,,,,,,,

,冷凝負(fù)荷Γ,,,,2.736906852,,kg/m·h,,,,,

,,,,,20853.24704,,kcal/m2·h·℃,,,,,

,四、總傳熱系數(shù)（外徑基準(zhǔn)）,,,,,,,,,,,

,,,,,0.00711834,,m2·h·℃/kcal,,,,,

,總傳熱系數(shù)U,,,,140.4821869,,kcal/m2·h·℃,,,,,

,五、計(jì)算所需傳熱面積A計(jì),,,,,,,,,,,

,傳熱溫差△T,,,,92.80520067,,,,,,,

,計(jì)算所需傳熱面積A計(jì),,,,34.62387087,,m2,,,,,

,換熱器裕度（A-A計(jì)）/A計(jì),,,,-4.821129846,,﹪,,,,,

,六、壓力損失,,,,,,,,,,,

,6.1管程壓力損失,,,,,,,,,,,

,Re＜2000時(shí),,,,,,,,,,,

,摩察系數(shù)λ,,,,FALSE,,,,,,,

,Re＞2000時(shí),,,,,,,,,,,

,假設(shè)λ=,,,,0.046470195,,,,,,,

,λ-1/2-(1.74-2lg（2ε/Di+18.7/（Re·λ-1/2）=,,,,-3.27252E-09,,,,,,,

,計(jì)算λ,,,,0.046470195,,,,,,,

,管內(nèi)流速V,,,,6.819493466,,m/s,,,,,

,△P=ρλ·(L/Di)·(V2/2),,,,13.57576083,,MPa,,,,,

,,,,,,,,,,,,,

,,,,,,,,,,,,,

,,,,,,,,,,,,,

,,,,λ試差值,,,,,,,,

,,,,計(jì)算值,0.046470195,,,,,,,

,,,,返回平均值,0.046470195,,,,,,,

,,,,,,,,,,,,,

,設(shè)備結(jié)構(gòu),,,,,,,,,,,

,材質(zhì),CT90,蛇管外徑D0m,0.0318,蛇管內(nèi)徑Dim,0.023,蛇管螺旋徑DHm,1.5,,,,

,蛇管螺旋間距Pt（1.5-2*D0)m,0.04,蛇管根數(shù)N,1,每根蛇管圈數(shù)N0,70,每根蛇管長(zhǎng)度Lm,329.8672286,,,,

,每根蛇管高度m,2.8,每根蛇管換熱面積Am2,32.9546091,殼側(cè)容器內(nèi)徑Dm,1.8,殼側(cè)容器筒體長(zhǎng)度Hm,3.5,,,,

,筒體設(shè)計(jì)壓力MPa,1.6,筒體厚度mm,16,,,,,,,,

,設(shè)備性能（管內(nèi)柴油125℃擠入井口，1MPa、184℃蒸汽加熱）,,,,,,,,,,,

,泵排量m3/min,擠3m3柴油所需時(shí)間min,,換熱面積余量﹪,,加熱盤(pán)管壓降MPa,,,,,,

,0.05,60,,118,,1.01,,,,,,

,0.07,43,,98,,2.3,,,,,,

,0.09,33,,54,,3.8,,,,,,

,0.11,27,,36,,5.7,,,,,,

,0.13,23,,23,,7.9,,,,,,

,0.15,20,,13,,10.5,,,,,,

,0.17,18,,5.34,,13.6,,,,,,

,0.19,16,,-1.5,,16.9,,,,,,

,設(shè)備性能（管內(nèi)柴油125℃擠入井口，0.8MPa、175℃蒸汽加熱）,,,,,,,,,,,

,泵排量m3/min,擠3m3柴油所需時(shí)間min,,換熱面積余量﹪,,加熱盤(pán)管壓降MPa,,,,,,

,0.05,60,,96.7,,1.0,,,,,,

,0.07,43,,61.4,,2.3,,,,,,

,0.09,33,,39.2,,3.8,,,,,,

,0.11,27,,23.6,,5.7,,,,,,

,0.13,23,,11.8,,7.9,,,,,,

,0.15,20,,2.6,,10.5,,,,,,

,0.17,18,,-4.8,,13.6,,,,,,

,0.19,,,,,,,,,,,

,設(shè)備性能（管內(nèi)柴油125℃擠入井口，0.6MPa、165℃蒸汽加熱）,,,,,,,,,,,

,泵排量m3/min,擠3m3柴油所需時(shí)間min,,換熱面積余量﹪,,加熱盤(pán)管壓降MPa,,,,,,

,0.05,60,,72.8,,1.0,,,,,,