. 排空气、散热损失和管道标准总结（summary of . row air, heat loss and pipe standards）

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1、10.5排空气、散热损失和管道标准总结（Summaryof10.5rowair,heatlossandpipestandards）ThispaperiscontributedbytaobuzhangPdfdocumentsmayexperiencepoorbrowsingontheWAPside.ItisrecommendedthatyouselectTXTfirstordownloadthesourcefiletothelocalmachine.ThetenthchapterissteamdistributionSummaryofexhaustair,heatlossandpipings

2、tandardsChapter10.5TenpointfiveSummaryofexhaustair,heatlossandpipingstandardsHandbookofsteamandcondensatesystems10.5.1ThetenthchapterissteamdistributionSummaryofexhaustair,heatlossandpipingstandardsChapter10.5Summaryofexhaustair,heatlossandpipingstandardsExhaustairThepipeisfilledwithairbeforethest

3、eamentersthepipelineforaperiodoftime.Airandothernoncondensablegasesalsogointothepipelinealongwithsteam.Comparedwithsteam,theproportionofthesenoncondensablegasesisverysmall.Unlesswetakemeasurestoeliminatethem,otherwise,whenthesteamcondenses,thesenoncondensablegaseswillaccumulateinthesteampipeandhea

4、texchangespace.Theconsequenceofairisnottoextendthetimeofstartingthemachine,reducetheefficiencyofequipmentandtheperformanceoftheprocess.Thepresenceofairinthesteamsystemalsoaffectsthetemperatureofthesystem.Theairhasitsownpressureinthewholesystem,andthepressureofthesteamisthetotalpressureofthesystem.

5、Therefore,theactualsteampressureandtemperaturearelessthanthepressureofthesteam/airmixtureshownbythereadingofthepressuregaugeandthecorrespondingtemperature.Whatismoreimportantistheeffectofaironheattransfer.Only1mthickfilmofair,thewaterfilmthermalresistanceand25m,and2mmthick15mmthickcopperplateandth

6、esame.Sotheexhaustairofanysteamsystemisveryimportant.Theexhaustvalveofthesteamsystem(theworkingprincipleofthethermostaticsteamtrap)shouldbeplacedabovethecondensedwaterlevel,sothatonlythemixtureofvapor/airwillarriveattheexhaustvalve.Thebestmountingpositionisattheendofthesteamhead,asshowninfigure10.

7、5.1.PressurebalancedairexhaustvalveTheairisdischargedtoasafepositionSteamSupervisorRowtosafepositionFigure10.5.1theenddrainandexhaustairofthesteamheadCondensatewaterTheexhaustportoftheexhaustvalveshouldbeconnecte