作者:标准资料网 时间:2024-05-27 05:43:11   浏览:8960   来源:标准资料网

【英文标准名称】:Naturalgas-Calculationofcalorificvalues,density,relativedensityandWobbeindexfromcomposition(ISO6976:1995includingCorrigendum1:1997,Corrigendum2:1997andCorrigendum3:1999);EnglishversionofDINENISO6976
【原文标准名称】:天燃气.热值、密度和相对密度及化合物沃泊指数的计算
【标准号】:DINENISO6976-2005
【标准状态】:现行
【国别】:德国
【发布日期】:2005-09
【实施或试行日期】:
【发布单位】:德国标准化学会(DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:计算方法;化学成分;数学计算;定义;密度;热值;沃泊指数;天然气
【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";fikewise,"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,thesumofthemolefractionsusedmustbeumtytothenearest0,0001,andallcomponentswithmolefractionsgreaterthan0,00005mustbeaccountedfor.5Forthecalorificvaluecalculatedonavolumetricbasis,therearelimitationsontheamountsofcomponentsotherthanmethanewhichmaybepresent.Itisimpossibletobedefinitiveonthismatter,butthefollowingguidelinesmaybeuseful:N2shouldnotbepresentinamountsexceeding0,3molefraction;CO2andC2H6shouldeachnotexceed0,15molefrac-tion;noothercomponentshouldexceed0,05molefraction.Giventheselimits,theexpectedtruenessofthecalculationiswithin0,1%.6Theeffectsofwatervapouronthecalortficvalue,e~therdirectlymeasuredorcalculated,arediscussedinannexF7Forthemethodsofcalculationdescribedtobevalid,thegasmustbeaboveitshydrocarbondew-pointatthepre-scribedreferenceconditions.8Thevaluesofbasicphysicalpropertydataaresubjecttorevwsionasmoreaccuratevaluesbecomeava~labiefromauthoritat,vesources.
【中国标准分类号】:E24
【国际标准分类号】:75_060
【页数】:50P.;A4
【正文语种】:英语