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【英文标准名称】:Naturalgas-Calculationofcalorificvalues,density,relativedensityandWobbeindexfromcomposition
【原文标准名称】:天燃气.热值、密度、相对密度和由化合物推导的沃泊指数的计算
【标准号】:BS7859-1996
【标准状态】:作废
【国别】:英国
【发布日期】:1996-03-15
【实施或试行日期】:1996-03-15
【发布单位】:英国标准学会(BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:准确度;估计;误差修正;再现性;燃料;相对密度;矿物燃料;天然气;密度;文献索引;热值;气体燃料;数学计算
【英文主题词】:Calorificvalue;Calorificvalues;Chemicalcomposition;Definition;Definitions;Density;Mathematicalcalculations;Methodsofcalculation;Naturalgas;Wobbeindex
【摘要】:ThisInternationalStandardspecifiesmethodsforthecalculationofthesuperiorcalorificvalue,inferiorcalorificvalue,density,relativedensityandWobbeindexofdrynaturalgases,naturalgassubstitutesandothercombustiblegaseousfuels,whenthecompo-sitionofthegasbymolefractionisknown.Themethodsprovideameansofcalculatingtheproper-tiesofthegasmixtureatcommonlyusedmetricref-erenceconditions.Themethodsofcalculationrequirevaluesforvariousphysicalpropertiesofthepurecomponents;thesevaluesareprovidedintablesandtheirsourcesareidentified.Methodsaregivenforestimatingtheprecisionofcalculatedproperties.Themethodsofcalculationofthevaluesofpropertiesoneitheramolarormassbasisareapplicabletoanydrynaturalgas,naturalgassubstituteorothercombustiblefuelwhichisnormallygaseous.Forthecalculationofthevaluesofpropertiesonavolumetricbasis,themethodsarerestrictedtogasesconsistingpreponderantlyofmethane(notlessthan0,5molefraction).ExamplesofcalculationsaregiveninannexDfortherecommendedmethodsofcalculation.NOTES1ThesymbolsusedinthisInternationalStandard,to-getherwiththeirmeanings,aregiveninannexA.2Thequalifiers"higher","upper","total"and"gross"are,forthepurposesofthisInternationalStandard,syn-onymouswith"superior";likewise,"lower"and"net"aresynonymouswith"inferior".Theterm"heatingvalue"issynonymouswith"calorificvalue";"specificgravity"issynonymouswith"relativedensity";"Wobbenumber"issynonymouswith"Wobbeindex";"compressibilityfactor"issynonymouswith"compressionfactor".3Ifthecompositionofthegasisknownbyvolumefrac-tionsthesemustbeconvertedtomolefractions(seeannexC).Note,however,thatthederivedmolefractionswillhaveuncertaintiesgreaterthanthoseoftheoriginalvolumefractions.4ForthepurposesofthisInternationalStandard,thesumofthemolefractionsusedmustbeunitytothenearest0,0001,andallcomponentswithmolefractionsgreaterthan0,00005mustbeaccountedfor.5Forthecalorificvaluecalculatedonavolumetricbasis,therearelimitationsontheamountsofcomponentsotherthanmethanewhichmaybepresent.Itisimpossibletobedefinitiveonthismatter,butthefollowingguidelinesmaybeuseful:N2shouldnotbepresentinamountsexceeding0,3molefraction;CO2andC2H6shouldeachnotexceed0,15molefrac-tion;noothercomponentshouldexceed0,05molefraction.Giventheselimits,theexpectedtruenessofthecalculationiswithin0,1%.6Theeffectsofwatervapouronthecalorificvalue,eitherdirectlymeasuredorcalculated,arediscussedinannexF.7Forthemethodsofcalculationdescribedtobevalid,thegasmustbeaboveitshydrocarbondew-pointatthepre-scribedreferenceconditions.8Thevaluesofbasicphysicalpropertydataaresubjecttorevisionasmoreaccuratevaluesbecomeavailablefromauthoritativesources.
【中国标准分类号】:E24
【国际标准分类号】:75_060
【页数】:56P;A4
【正文语种】:英语