蒸汽管道压降温降计算EXCEL软件

1、名 称符号公 式管道外径Do管道总长度L管道始端蒸汽焓H1蒸汽始端压力P1蒸汽始端温度T1蒸汽终端允许压力P2管道终端允许温度T2管道终端允许蒸汽焓H2管道蒸汽流量V管道允许焓降HH=H1-H2假定保温厚度假定假定管道保温外径D1D1=D0+2*假定管道外表面积SS=*D1*L/1000允许散热密度qq=1000*H*V/S允许对流和辐射散热密度q1假定：q1=q环境温度ta假定室外常年平均风速w保温层材料黑度(镀锌铁皮)假设管道保温外壁温度ts假定管道对流传热系数acac=72.81*w0.6/D10.4管道保温外表面传热系数anan=(5.67*/(ts-ta)/(273+ts)/100)

2、4-(273+ta)/100)4)传热系数aa=ac+an允许保温外表面温度tsts=ta+q1/a管道设计温度TT=(T1+T2)/2管道外表面温度tt=T1管道保温层平均温度tmtm=(t+ta)/2保温材料导热系数=0.035+1.65*0.0001*tm+1.242*E-7*tm2保温层热传导散热密度q2q2=q1保温层厚度=*(t-ts)/q2实际取用保温厚度A实际保温层热传导散热密度q2q2=(t-ts)/(A/)实际取用保温外径D1D1=D0+2*A管道实际总外表面积SS=*D1*L/1000管道实际损失热量QQ=q2*S/1000蒸汽焓降HH=Q/V终端实际焓H2H2=H1-H

3、终端实际温度T2查表单 位管径计算(426x8)管径计算(426x8)管径计算(426x8)管径计算(426x8)mm426426133219m160016001000700kj/kg303230322828.273287Mpa0.850.8513.8290290200430Mpa0.50.50.83.65260260173405kj/kg3000300027753232.11t/h6050521kj/kg323253.2754.89mm100100100150mm626626333519m23145.0243145.0241045.621140.762W/m2169.580052141.31

4、67170.75812543280.6822691w/m2169.580052141.3167170.75812543280.6822691-30-302020m/s32230.250.250.250.2500304010.709628328.39691280510.8086557111.545077180.0022850510.0022850510.0133872710.0112214610.711913378.39919785610.8220429811.55629864-14.16902321-13.1749754726.5383334344.28824987275275186.5417

5、.5275275186.5417.5122.5122.5103.25218.75W/(m.K)0.0570762760.0570762760.0533602920.077036914w/m2169.580052141.3167170.75812543280.6822691mm97.32684276116.3907263120.6306861102.4328384mm100100100150w/m2165.0469105164.479545185.35601215191.6738768mm626626333519m23145.0243145.0241045.621140.762kw519.076

6、4947517.292116889.24995342218.6542751kj/kg31.1445896837.2450324164.2599664637.48359001kj/kg3000.855412994.7549682764.0100343249.516412702651704121.734104046误差 %名 称符 号单 位公 式管段始端压力p1Mpa管段始端温度t1蒸汽流量Gt/h管段始端蒸汽比容1m3/kg管段始端蒸汽焓值h1kj/kg管段末端允许压力(假定)p2Mpa管段末端允许温度(假定)t2管段末端蒸汽比容(假定)2m3/kg平均压力ppjMpa平均比容pjm3/kgVp

7、j=0.5*(1+2)管道流速计算wm/sw=G/(Di/594.7)2抽汽管道管外径(假定)Dwmm抽汽管道管内径Dimm抽汽管道壁厚mm介质动力粘度1Pa.s查汽规P162165页介质运动粘度m2/s=1*1雷诺系数ReRe=w*Di/管道等值粗糙度查汽规P166页管道相对粗糙度/Di管道摩擦系数查汽规P39页莫迪图管道弯头个数n1每90米一个弯管道上阀门个数n2闸阀1只单个弯头局部阻力系数j1j1=20*(单个弯头阻力系数)弯头处局部总阻力系数jwjw=n1*j1(弯头局部阻力系数:r/d=1)止回阀局部阻力系数j2查汽规(止回阀门阻力系数：L/Di=50)闸阀局部阻力系数j3查汽规(闸

8、阀阻力系数)jfjf=j2+1*j3管道局部阻力系数jj=jw+jf管道沿程阻力系数yy=*L/Di管道总长Lm管道阻力系数tt=j+y管道压降P1PaP1=t*w2/2*管道压降PMPap=1.1*p1/1000000(阻力预留10%预量)终端管道实际压力P2MPaP2=P1-P管道压降比值Bp/p1终端压力计算误差 %数值1(426x8)数值1(219x6)13.82004305210.2060.08172828.273287.670.83.651704050.22110.081620.9003.7250.213550.0816624.168262615.1622815224.190944133219125200560.20.30.00160.00150.0150.020.0214256895030110.250.412.512030.2500.25312.751