精餾塔保溫層厚度的計(jì)算表格

1、管管 道道 保保 溫溫 層層 厚厚 度度 的的 計(jì)計(jì) 算算 方方 法法(三三種種方方法法)(一).通過控制保溫層外表面溫度的方法計(jì)算管道內(nèi)介質(zhì)的溫度 t=95輸入主保溫層外表面溫度 tw1=34.66保溫層平均溫度 tp=64.83保溫材料在tp溫度下的導(dǎo)熱系數(shù) w/m1=0.048輸入管道外徑 mdw=0.219輸入管道周圍空氣溫度tk=28輸入管道外的風(fēng)速 m/s=4輸入保溫層表面到周圍空氣的放熱系數(shù) w/(m2k)h=25.53設(shè)管道主保溫層外徑為d1:d1/dwln(d1/dw)=0.1556令d1/dwln(d1/dw)=xlnx查表得：xlnx=0.1556輸入x=1.147輸入則

2、保溫層厚度為 : m=0.0161(二).通過控制最大熱損失的方法計(jì)算管道內(nèi)介質(zhì)的溫度 t=95輸入保溫層平均溫度 tp=70輸入保溫材料的導(dǎo)熱系數(shù) w/m1=0.048輸入管道外徑 mdw=0.219輸入管道周圍空氣溫度tk=28輸入保溫層表面到周圍空氣的放熱系數(shù) w/(m2k)h=0.034單位表面允許最大散熱量 qq=93設(shè)管道主保溫層外徑為d1:d1=0.3527則保溫層厚度為 : m=0.0668注:當(dāng)預(yù)先定出管道或設(shè)備的表面最大允許散熱損失時(shí),其保溫層的經(jīng)濟(jì)厚度為:1=0.0037(三).通過控制溫度降時(shí)的保溫層厚度計(jì)算管道內(nèi)的介質(zhì)流量 kg/hg=35輸入介質(zhì)平均比熱 kj/(k

3、g)c=896輸入介質(zhì)始端溫度 t1=95輸入介質(zhì)終端溫度 t2=70輸入管道輸送長度 ml=1000輸入平面保溫層到周圍空氣的放熱系數(shù) w/(m2k)h1=0.344輸入管道支吊架局部保溫系數(shù)k1=1.2輸入當(dāng)(t1-tk)/(t2-tk)2時(shí)true設(shè)管道主保溫層外徑為d1:d1=0.2290則保溫層厚度為 : m=0.0050當(dāng)(t1-tk)/(t2-tk)2時(shí)false設(shè)管道主保溫層外徑為d1:d1=0.2227則保溫層厚度為 : m=0.0018(四).直埋管道的保溫層厚度計(jì)算土壤的導(dǎo)熱系數(shù) w/mt=1.74土壤層溫度 tt=5埋管深度 mh=1.2設(shè)管道主保溫層外徑為d1:d1=

4、0.0442則保溫層厚度為 : m=-0.0874備 注tw1=33.4+0.028(t50) (或者根據(jù)工藝要求直接輸入)tp=(t+tw1)/2h=11.63+6.950.5d1/dwln(d1/dw)=21(t-tw1)/hdw(tw1-tk)見后面附表1見后面附表1=(d1-dw)/2=(x-1)dw/2此計(jì)算方法計(jì)算保溫層厚度時(shí),外表面溫度未知,平均溫度查附表2查附表3查附表4ln(d1/dw)=23.141(t-tk)/qh1=2.69dw1.211.35tw11.73/q1.5室內(nèi)取0.086,室外取0.344吊架室內(nèi)1.10,室外1.15;支架室內(nèi)1.15,室外1.20當(dāng)(t1

5、-tk)/(t2-tk)2時(shí),用下面公式計(jì)算：ln(d1/dw)=23.141(tp-tk)lk1/gc(t1-t2)h1=(d1-dw)/2當(dāng)(t1-tk)/(t2-tk)2時(shí)，用下面公式計(jì)算：ln(d1/dw)=23.141(t2-tk)lk1/gc(t1-tk)h1=(d1-dw)/2一般可取1.74w/m一般可取5管管 道道 保保 溫溫 層層 厚厚 度度 的的 計(jì)計(jì) 算算 方方 法法(三三種種方方法法)lnd1=1(tw1-tt)ln(dw)+1(t-tw1)ln(4h)/t(tw1-tt)+1(t-tw1)=(d1-dw)/2x與與xlnx函函數(shù)數(shù)表表(當(dāng)當(dāng)x=15時(shí)時(shí)的的xlnx)

6、值值xxlnxxxlnxxxlnxxxlnxx10.0001.420.4992.141.632.863.0023.581.0050.0051.430.5122.151.6482.873.0213.591.010.010051.440.5262.161.6652.883.0453.61.0150.015151.450.5392.171.6812.893.0653.611.020.02021.460.5522.181.6992.93.0853.621.0250.2531.470.5652.191.722.913.1043.631.030.03041.480.582.21.7352.923.133.

7、641.0350.03561.490.5942.211.7562.933.153.651.040.04071.50.6072.221.7712.943.173.661.0450.0461.510.6222.231.7912.953.193.671.050.05121.520.6372.241.8052.963.213.681.0550.05651.530.652.251.8252.973.243.691.060.06171.540.6652.261.8412.983.253.71.0650.0671.550.6792.271.8612.993.273.711.070.07241.560.695

8、2.281.8833.293.721.0750.07771.570.7082.291.8993.013.313.731.080.08311.580.7222.31.923.023.343.741.0850.08851.590.7372.311.9353.033.363.751.090.09461.60.7512.321.9553.043.383.761.0950.09941.610.7652.331.973.053.43.771.10.10481.620.7822.341.993.063.423.781.1050.111.630.7992.352.0073.073.443.791.110.11

9、621.640.8152.362.0273.083.463.81.1150.121.1.650.8272.372.0423.093.483.811.120.127.1.660.8422.382.0623.13.53.821.1250.13271.670.8562.392.083.113.533.831.130.1381.680.8722.42.13.123.553.841.1350.1431.690.8892.412.123.133.573.851.140.14921.70.9022.422.143.143.593.861.1450.15451.710.9162.432.163.153.613

10、.871.150.16071.720.9322.442.183.163.643.881.1550.16651.730.9492.452.1953.173.663.891.160.17211.740.9652.462.2173.183.683.91.1650.17721.750.982.472.2333.193.73.911.170.18461.760.9942.482.2553.23.723.921.1750.1891.771.0112.492.273.213.743.931.180.1951.781.0292.52.293.223.763.941.1850.2011.791.042.512.

11、313.233.783.951.190.2071.81.0592.522.3283.243.813.961.1950.2131.811.0812.532.3443.253.833.971.20.2181.821.0892.542.373.263.853.981.2050.251.831.1082.552.3853.273.883.991.210.231.841.1212.562.4053.283.941.2150.2361.851.1382.572.4253.293.924.011.220.2421.861.1522.582.4443.33.944.021.2250.2451.871.1692

12、.592.4623.313.964.031.230.25451.881.1852.62.483.323.984.041.2350.2611.891.2052.612.5033.3344.051.240.2661.91.222.622.5213.344.034.061.2450.2721.911.2342.632.543.354.054.071.250.2791.921.2512.642.563.364.074.081.2550.2851.931.272.652.583.374.094.091.260.2911.941.2882.662.63.384.124.11.2650.2981.951.3

13、022.672.623.394.144.111.270.341.961.3182.682.643.44.164.121.2750.3091.971.3352.692.663.414.184.131.280.3161.981.3512.72.683.424.24.141.2850.3221.991.3692.712.73.434.234.151.290.32821.3862.722.723.444.254.161.2950.3342.011.4012.732.743.454.274.171.30.342.021.4192.742.763.464.34.181.310.3542.031.4392.

14、752.783.474.324.191.320.3672.041.4552.762.83.484.344.21.330.382.051.4712.772.823.494.364.211.340.3892.061.4882.782.843.54.384.221.350.4052.071.5072.792.863.514.44.231.360.4172.081.522.82.883.524.424.241.370.4322.091.5422.812.9013.534.454.251.380.4452.11.5592.822.9213.544.474.261.390.4572.111.5792.83

15、2.943.554.54.271.40.472.121.5922.842.9613.564.524.281.410.4852.131.612.852.983.574.554.29xlnxxxlnx4.574.36.274.594.316.294.624.326.324.644.336.354.664.346.384.684.356.44.714.366.424.734.376.444.754.386.464.774.396.484.84.46.524.824.416.544.844.426.574.864.436.64.884.446.624.914.456.644.934.466.674.9

16、64.476.74.984.486.7254.496.745.034.56.775.054.516.795.074.526.815.094.536.835.124.546.865.154.556.95.174.566.925.194.576.945.214.586.975.244.596.995.264.67.025.284.617.055.314.627.075.334.637.15.354.647.1253.74.657.145.44.667.165.434.677.195.454.687.215.474.697.245.54.77.265.534.717.285.554.727.325.

17、574.737.355.64.747.385.624.757.45.644.767.425.664.777.455.684.787.475.714.797.5x與與xlnx函函數(shù)數(shù)表表(當(dāng)當(dāng)x=15時(shí)時(shí)的的xlnx)值值5.744.87.525.764.817.555.784.827.585.814.837.65.834.847.635.854.857.655.884.867.685.914.877.75.934.887.735.954.897.765.984.97.786.014.917.86.034.927.836.054.937.856.074.947.866.14.957.96.134

18、.967.926.154.977.956.174.9886.194.998.026.2258.056.25附附表表2:保保 溫溫 層層 平平 均均 溫溫 度度 tp周圍空氣溫度()介 質(zhì) 溫 度10015020025030035040025709512515017520523015659012014517020022506080110135160190215-155575105130155185210附附表表3-1:季季 節(jié)節(jié) 運(yùn)運(yùn) 行行 工工 況況 允允 許許 最最 大大 散散 熱熱 損損 失失設(shè)備、管道及附件外表面溫度50100150200250300允許最大散熱損失11616320324

19、4279308附附表表3-2:常常 年年 運(yùn)運(yùn) 行行 工工 況況 允允 許許 最最 大大 散散 熱熱 損損 失失設(shè)備、管道及附件外表面溫度 323(50)373(100) 423(150) 473(200) 523(250) 573(250)允許最大散熱損失5893116140163186附附表表4:保保 溫溫 層層 表表 面面 熱熱 阻阻公稱直徑(mm)室內(nèi)室外介質(zhì)溫度t()介質(zhì)溫度t()100200300400500100200300圓 筒 面 放 熱 阻 力 r2 (m2k/w)250.3010.2580.2150.1980.1890.1030.0950.086320.2750.2320

20、.1980.1630.1380.0950.0860.077400.2580.2150.1810.1550.1290.0860.0770.069500.1980.1630.1380.120.1030.0690.060.0521000.1550.1290.1120.0950.0770.0520.0430.0431250.1290.1120.0950.0770.0690.0430.0340.0341500.1030.0860.0770.0690.060.0340.0260.0262000.0860.0770.0690.060.0520.0340.0260.0262500.0770.0690.060.0520.0430.0260.0170.0173000.0690.060.0520.0430.0430.0260.0170.0173500.0