管 道 保 温 层 厚 度 的 计 算 方 法Method for calculating thickness of pipeline insulation layer.docx
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管 道 保 温 层 厚 度 的 计 算 方 法Method for calculating thickness of pipeline insulation layer.docx
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管道保温层厚度的计算方法Methodforcalculatingthicknessofpipelineinsulationlayer
管道保温层厚度的计算方法(Methodforcalculatingthicknessofpipelineinsulationlayer)
Calculationmethodofthicknessofpipelineinsulationlayer(threemethods)
(1)bycontrollingtheoutersurfacetemperatureoftheinsulatinglayer;
Thetemperatureofthemediuminthepipelineist=95
Theoutersurfacetemperatureofthemaininsulationlayeristw1=34.66tw1=33.4+0.028*(T-50)(ordirectinputaccordingtoprocessrequirements)
Theaveragetemperatureofinsulationlayeristp=64.83tp=(t+tw1)/2
ThethermalconductivityoftheinsulatingmaterialatTPtemperatureisW/mDEGC1=0.048
Theouterdiameterofpipeismdw=0.219
Theairtemperaturearoundthepipeistk=28
Windspeedoutsidetheductm/somega=4
TheheatreleasecoefficientofthesurfaceoftheinsulatinglayertothesurroundingairisW/(M2=k),alphah=25.53,alphah=11.63+6.95**0.5
Apipemaininsulationlayerouterdiameterisd1:
d1/dw*ln(d1/dw)=0.1556d1/dw*ln(d1/dw)=2*1*(t-tw1)/lambdaalphah*DW*(tw1-tk)]
Maked1/dwxln(d1/dw)=x.LNXlookuptable:
X.Lnx=0.1556input,seeTable1later
Thex=1.147inputisshowninTable1later
Thethicknessoftheinsulatinglayerism=0.0161=/2==d1-dw(x-1)*dw/2
(two)calculationbycontrollingthemaximumheatloss
Thetemperatureofthemediuminthepipelineist=95
Theaveragetemperatureofinsulationlayeristp=70.Whentheinsulationthicknessiscalculatedbythismethod,theoutsidesurfacetemperatureisunknownandtheaveragetemperatureischeckedinTable2
ThethermalconductivityoftheinsulationmaterialisW/mDEGC,lambda1=0.048input
Pipeouterdiametermdw=0.219input
Theairtemperaturearoundthepipeistk=28
TheheatreleasecoefficientoftheinsulatinglayertothesurroundingairisW/(M2=k),alphah=0.034
ThemaximumheatdissipationoftheunitsurfaceisQq=93.Checktable4
Themaininsulationlayerofthepipelineisd1:
d1=,0.3527ln(d1/dw),=2*3.14*x,1*(t-tk)/q-alphah]
Thethicknessoftheinsulatinglayerism=0.0668
Note:
whenthemaximumallowableheatlossofthesurfaceofthepipeorequipmentispredetermined,theeconomicthicknessoftheinsulationlayeris:
Delta1=0.0037,Delta1=2.69*dw1.2*x11.35*tw11.73/q1.5
(three)calculatethethicknessoftheinsulatinglayerwhencontrollingthetemperaturedrop
Themediumflowinthepipeiskg/hG=35input
Mediumaveragespecificheatkj/(kgDEGC)C=896input
Mediumstarttemperaturet1=95input
Mediumterminaltemperaturet2=70input
PipeconveyinglengthmL=1000input
TheheatreleasecoefficientoftheplaneinsulationlayertothesurroundingairisW/(M2*k),alphaH=1=0.344,andtheinputchamberis0.086,and0.344istakenoutside
ThelocalheatpreservationcoefficientK1=ofthepipesupportandhangeris1.2intothehangerchamber1.10andoutdoor1.15;thesupportroomis1.15andtheoutdooris1.20
When(t1-tk)/(t2-tk)<2,TRUE,when(t1-tk)/(t2-tk)<2,iscalculatedusingthefollowingformula:
Themaininsulationlayerofthepipelineshallbed1:
d1=,0.2290ln(d1/dw),=2*3.14*x,1x[(tp-tk)*L*K1/[G*C*(T1-T2)-H1]
Thethicknessoftheinsulatinglayerism=0.0050=d1-dw=/2
When(t1-tk)/(t2-tk)=2whenFALSE(t1-tk)/(t2-tk)=2,calculatedbythefollowingformula:
Themaininsulationlayerofthepipelineshallbed1:
d1=,0.2227ln(d1/dw),=2*3.14*x,1x[(t2-tk)*L*K1/[G*C*(t1-tk)-H1]
Thethicknessoftheinsulatinglayerism=0.0018=d1-dw=/2
(four)calculationofinsulationlayerthicknessofburiedpipeline;
ThethermalconductivityofsoilW/m.1.74W/mt=1.74isgenerallydesirable
Soiltemperatureistt=5,generally5degreescentigrade
Thedepthofembeddedpipeismh=1.2
Apipemaininsulationlayerisd1:
diameterd1=0.0442lnd1=[lambda1*(tw1-tt)*ln(DW)+lambda1x(t-tw1)*ln(4h)t(tw1-tt)/lambdax+lambda1x(t-tw1)]
Thethicknessoftheinsulatinglayerism=-0.0874=/2(d1-dw)
Xandxlnxfunctiontables(valuesofxlnxwhenx=1~5)
X,x,LNX,x,x,LNX,x,LNX,x,x,LNX,x,x,,LNX,x,x,x,LNX
10,1.42,0.499,2.14,1.63,2.86,3.002,3.58,,4.57,4.3,6.27
1.005,0.005,1.43,0.512,2.15,1.648,2.87,3.021,,3.59,4.59,4.31,6.29
1.01,0.01005,1.44,0.526,2.16,1.665,2.88,3.045,,3.6,4.62,4.32,6.32
1.015,0.01515,1.45,0.539,2.17,1.681,2.89,3.065,,3.61,4.64,4.33,6.35
1.02,0.0202,1.46,0.552,2.18,1.699,2.9,3.085,,3.62,4.66,4.34,6.38
1.025,0.253,1.47,0.565,2.19,1.72,2.91,3.104,,3.63,4.68,4.35,6.4
1.03,0.0304,1.
48,0.58,2.2,1.735,2.92,3.13,3.64,4.71,4.36,6.42
1.035,0.0356,1.49,0.594,2.21,1.756,2.93,3.15,3.65,4.73,4.37,6.44
1.04,0.0407,1.5,0.607,2.22,1.771,2.94,3.17,3.66,4.75,4.38,6.46
1.045,0.046,1.51,0.622,2.23,1.791,2.95,3.19,3.67,4.77,4.39,6.48
1.05,0.0512,1.52,0.637,2.24,1.805,2.96,3.21,3.68,4.8,4.4,6.52
1.055,0.0565,1.53,0.65,2.25,1.825,2.97,3.24,3.69,4.82,4.41,6.54
1.06,0.0617,1.54,0.665,2.26,1.841,2.98,3.25,3.7,4.84,4.42,6.57
1.065,0.067,1.55,0.679,2.27,1.861,2.99,3.27,3.71,4.86,4.43,6.6
1.07,0.0724,1.56,0.695,2.28,1.88,3,3.29,3.72,4.88,4.44,6.62
1.075,0.0777,1.57,0.708,2.29,1.899,3.01,3.31,3.73,4.91,4.45,6.64
1.08,0.0831,1.58,0.722,2.3,1.92,3.02,3.34,3.74,4.93,4.46,6.67
1.085,0.0885,1.59,0.737,2.31,1.935,3.03,3.36,3.75,4.96,4.47,6.7
1.09,0.0946,1.6,0.751,2.32,1.955,3.04,3.38,3.76,4.98,4.48,6.72
1.095,0.0994,1.61,0.765,2.33,1.97,3.05,3.4,3.77,5,4.49,6.74
1.1,0.1048,1.62,0.782,2.34,1.99,3.06,3.42,3.78,5.03,4.5,6.77
1.105,0.11,1.63,0.799,2.35,2.007,3.07,3.44,3.79,5.05,4.51,6.79
1.11,0.1162,1.64,0.815,2.36,2.027,3.08,3.46,3.8,5.07,4.52,6.81
1.1150.121。
1.65,0.827,2.37,2.042,3.09,3.48,3.81,5.09,4。
536.83
1.120.127。
1.66,0.842,2.38,2.062,3.1,3.5,3.82,5.12,4.54,6.86
1.125,0.1327,1.67,0.856,2.39,2.08,3.11,3.53,3.83,5.15,4.55,6.9
1.13,0.138,1.68,0.872,2.4,2.1,3.12,3.55,3.84,5.17,4.56,6.92
1.135,0.143,1.69,0.889,2.41,2.12,3.13,3.57,3.85,5.19,4.57,6.94
1.14,0.1492,1.7,0.902,2.42,2.14,3.14,3.59,3.86,5.21,4.58,6.97
1.145,0.1545,1.71,0.916,2.43,2.16,3.15,3.61,3.87,5.24,4.59,6.99
1.15,0.1607,1.72,0.932,2.44,2.18,3.16,3.64,3.88,5.26,4.6,7.02
1.155,0.1665,1.73,0.949,2.45,2.195,3.17,3.66,3.89,5.28,4.61,7.05
1.16,0.1721,1.74,0.965,2.46,2.217,3.18,3.68,3.9,5.31,4.62,7.07
1.165,0.1772,1.75,0.98,2.47,2.233,3.19,3.7,3.91,5.33,4.63,7.1
1.17,0.1846,1.76,0.994,2.48,2.255,3.2,3.72,3.92,5.35,4.64,7.12
1.175,0.189,1.77,1.011,2.49,2.27,3.21,3.74,3.93,53.7,4.65,7.14
1.18,0.195,1.78,1.029,2.5,2.29,3.22,3.76,3.94,5.4,4.66,7.16
1.185,0.201,1.79,1.04,2.51,2.31,3.23,3.78,3.95,5.43,4.67,7.19
1.19,0.207,1.8,1.059,2.52,2.328,3.24,3.81,3.96,5.45,4.68,7.21
1.195,0.213,1.81,1.081,2.53,2.344,3.25,3.83,3.97,5.47,4.69,7.24
1.2,0.218,1.82,1.089,2.54,2.37,3.26,3.85,3.98,5.5,4.7,7.26
1.2050.251.831.1082.552.3853.273。
883.995.534.717.28
1.21,0.23,1.84,1.121,2.56,2.405,3.28,3.9,4,5.55,4.72,7.32
1.215,0.236,1.85,1.138,2.57,2.425,3.29,3.92,4.01,5.57,4.73,7.35
1.22,0.242,1.86,1.152,2.58,2.444,3.3,3.94,4.02,5.6,4.74,7.38
1.225,0.245,1.87,1.169,2.59,2.462,3.31,3.96,4.03,5.62,4.75,7.4
1.23,0.2545,1.88,1.185,2.6,2.48,3.32,3.98,4.04,5.64,4.76,7.42
1.235,0.261,1.89,1.205,2.61,2.503,3.33,4,4.05,5.66,4.77,7.45
1.24,0.266,1.9,1.22,2.62,2.521,3.34,4.03,4.06,5.68,4.78,7.47
1.245,0.272,1.91,1.234,2.63,2.54,3.35,4.05,4.07,5.71,4.79,7.5
1.25,0.279,1.92,1.251,2.64,2.56,3.36,4.07,4.08,5.74,4.8,7.52
1.255,0.285,1.93,1.27,2.65,2.58,3.37,4.09,4.09,5.76,4.81,7.55
1.26,0.291,1.94,1.288,2.66,2.6,3.38,4.12,4.1,5.78,4.82,7.58
1.265,0.298,1.95,1.302,2.67,2.62,3.39,4.14,4.11,5.81,4.83,7.6
1.27,0.34,1.96,1.318,2.68,2.64,3.4,4.16,4.12,5.83,4.84,7.63
1.275,0.309,1.97,1.335,2.69,2.66,3.41,4.18,4.13,5.85,4.85,7.65
1.28,0.316,1.98,1.351,2.7,2.68,3.42,4.2,4.14,5.88,4.86,7.68
1.285,0.322,1.99,1.369,2.71,2.7,3.43,4.23,4.15,5.91,4.87,7.7
1.29,0.328,2,1.386,2.72,2.72,3.44,4.25,4.16,5.93,4.88,7.73
1.2950.3342.011.4012。
732.743.454.274.175.954.897.76
1.3,0.34,2.02,1.419,2.74,2.76,3.46,4.3,4.18,5.98,4.9,7.78
1.31,0.354,2.03,1.439,2.75,2.78,3.47,4.32,4.19,6.01,4.91,7.8
1.32,0.367,2.04,1.455,2.76,2.8,3.48,4.34,4.2,6.03,4.92,7.83
1.33,0.38,2.05,1.471,2.77,2.82,3.49,4.36,4.21,6.05,4.93,7.85
1.34,0.389,2.06,1.488,2.78,2.84,3.5,4.38,4.22,6.07,4.94,7.86
1.35,0.405,2.07,1.507,2.79,2.86,3.51,4.4,4.23,6.1,4.95,7.9
1.36,0.417,2.08,1.52,2.8,2.88,3.52,4.42,4.24,6.13,4.96,7.92
1.37,0.432,2.09,1.542,2.81,2.901,3.53,4.45,4.25,6.15,4.97,7.95
1.38,0.445,2.1,1.559,2.82,2.921,3.54,4.47,4.26,6.17,4.98,8
1.39,0.457,2.11,1.579,2.83,2.94,3.55,4.5,4.27,6.19,4.99,8.02
1.4,0.47,2.12,1.592,2.84,2.961,3.56,4.52,4.28,6.22,5,8.05
1.41,0.485,2.13,1.61,2.85,2.98,3.57,4.55,4.29,6.25
附表3-2:
常年运行工况允许最大散热损失
设备、管道及附件外表面温度323(50)373(100)423(150)473(200)523(250)573(250)623(350)
允许最大散热损失5893116140163186209
附表4:
保温层表面热阻
Nominaldiameter(mm)indoorandoutdoor
MediumtemperatureT(DEGC)mediumtemperatureT(DEGC)
=100200300400500=100200300400500
TheheatreleaseresistanceofthecylindersurfaceisR2(M2=K/w)
250.301,0.258,0.215,0.198,0.189,0.103,0.095,,0.086,0.077,0.077
320.275,0.232,0.198,0.163,0.138,0.095,0.086,,0.077,0.069,0.06
400.258,0.215,0.181,0.155,0.129,0.086,0.077,,0.069,0.06,0.052
500.198,0.163,0.138,0.12,0.103,0.069,0.06,,0.052,0.043,0.043
1000.155,0.129,0.112,0.095,0.077,0.052,0.043,,0.043,0.034,0.034
1250.129,0.112,0.095,0.077,0.069,0.043,0.034,,0.034,0.026,0.026
1500.103,0.086,0.077,0.069,0.06,0.034,0.026,,0.026,0.026,0.026
2000.086,0.077,0.069,0.06,0.052,0.034,0.026,,0.026,0.017,0.017
2500.077,0.069,0.06,0.052,0.043,0.026,0.017,,0.017,0.017,0.017
3000.069,0.06,0.052,0.043,0.043,0.026,0.017,,0.017,0.017,0.017
3500.
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