1、BRITISH STANDARD BS EN 12953-7:2002 Shell boilers Part 7: Requirements for firing systems for liquid and gaseous fuels for the boilers The European Standard EN 12953-7:2002 has the status of a British Standard ICS 27.060.30; 27.100 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT L
2、AWBS EN 12953-7:2002 This British Standard, having been prepared under the direction of the Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 14 June 2002 BSI 14 June 2002 ISBN 0 580 39847 1 National foreword This Br
3、itish Standard is the official English language version of EN 12953-7:2002. When the reference to this European Standard has been published in the Official Journal of the European Communities (OJ), compliance with it will confer a presumption of conformity with the essential requirements covered by
4、the standard in respect of the Pressure Equipment Directive. The UK participation in its preparation was entrusted to Technical Committee PVE/16, Shell boilers, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-r
5、eferences The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of Bri
6、tish Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users of this publication are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to unde
7、rstand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document compris
8、es a front cover, an inside front cover, the EN title page, pages 2 to 10, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE E
9、UROPISCHENORM EN129537 May2002 ICS27.060.30;27.100 Englishversion ShellboilersPart7:Requirementsforfiringsystemsforliquid andgaseousfuelsfortheboilers ChaudirestubesdefumePartie7:Exigencespour lesquipementsdechauffepourcombustiblesgazeuxet liquidesdelachaudire GrowasserraumkesselTeil7:Anforderungena
10、n FeuerungsanlagenfrflssigeundgasfrmigeBrennstoffe frdenKessel ThisEuropeanStandardwasapprovedbyCENon15May2002. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbi
11、bliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifi
12、edtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEE
13、FORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2002CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN129537:2002EEN129537:2002(E) 2 Contents page Foreword . 3 1 Scope 4 2 Norma
14、tivereferences 4 3 Termsanddefinitions . 4 4 Fuelsupply. 6 4.1 Fueltransferandpreparation . . 6 4.2 Fuellines 6 4.3 Safetyshutoffdevices(Safetytripvalves) 7 5 Airsupply,air/fuelratio 7 6 Firingsystem . 8 6.1 Burners. 8 6.2 Inspectionopenings. . 8 6.3 Purging,startupandshutdown 8 6.4 Commonstackforse
15、veralfiringsystems. . 8 6.5 Fuels . 8 AnnexZA (informative) ClausesofthisEuropeanStandardaddressingessentialrequirementsorother provisionsofEUDirectives 9 Bibliography 10EN129537:2002(E) 3 Foreword Thisdocument(EN129537:2002)hasbeenpreparedbyTechnicalCommitteeCEN/TC269“Shellandwatertube boilers“,the
16、secretariatofwhichisheldbyDIN. ThisEuropeanStandardhasbeenpreparedunderamandategiventoCENbytheEuropeanCommissionandthe EuropeanFreeTradeAssociation,andsupportsessentialrequirementsofEUDirective(s). ForrelationshipwithEUDirective(s),seeinformativeAnnexZA,whichisanintegralpartofthisstandard. ThisEurop
17、eanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidenticaltextor byendorsement,atthelatestbyNovember2002,andconflictingnationalstandardsshallbewithdrawnatthelatest byNovember2002. TheEuropeanStandardEN12953concerningshellboilersconsistsofthefollowingParts: Part1: General. P
18、art2: Materialsforpressurepartsofboilersandaccessories. Part3: Designandcalculationforpressureparts. Part4: Workmanshipandconstructionofpressurepartsoftheboiler. Part5: Inspectionduringconstruction,documentationandmarkingofpressurepartsoftheboiler. Part6: Requirementsforequipmentfortheboiler. Part7:
19、 Requirementsforfiringsystemsforliquidandgaseousfuelsfortheboiler. Part8: Requirementsforsafeguardsagainstexcessivepressure. Part9: Requirementsforlimitingdevicesoftheboilerandaccessories. Part10: Requirementsforboilerfeedwaterandboilerwaterquality. Part11: Acceptancetests. Part12: Requirementsforfi
20、ringsystemsforsolidfuelsfortheboiler. Part13: Operatinginstructions. CR1295314: Guidelinesfortheinvolvementofaninspectionbodyindependentofthemanufacturer. AlthoughthesePartscanbeobtainedseparately,itshouldberecognizedthatthePartsareinterdependent.As such,thedesignandmanufactureofshellboilersrequires
21、theapplicationofmorethanonePartinorderforthe requirementsofthestandardtobesatisfactorilyfulfilled. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRe public,Denmark,Finland, France,Germ
22、any,Greece,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain, Sweden,SwitzerlandandtheUnitedKingdom.EN129537:2002(E) 4 1Scope ThisPartofthisEuropeanStandardspecifiesrequirementsforfiringsystemsforoilandgaseousfuelsapplicableto shellboilers,asdefinedinEN129531,irrespectiveofthe
23、degreeofsupervision.Formultifuelfiringsystemsusing separateorcombinedburners,theserequirementsapplytotheoiland/orgasfiringpartinvolved. ThisPartofthisEuropeanStandardspecifiestheimprovedsafetymeasuresrequiredwhenseveralfuelsareburnt simultaneously. 2 Normativereferences ThisEuropeanStandardincorpora
24、tes,bydatedorundatedreference,provisionsfromotherpublications.These normativereferencesarecitedattheappropriateplacesinthetextandthepublicationsarelistedhereafter.For datedreferences,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplytothisEuropean Standardonlywhenincorporatedinitbyamendm
25、entorrevision.Forundatedreferences,thelatesteditionofthe publicationreferredtoapplies(includingamendments). EN267, ForceddraughtoilburnersDefinitions,requirements,testing,marking . EN676, Automaticforceddraughtburnersforgaseousfuels. EN129531, General. 3 Termsanddefinitions ForthepurposesofthisParto
26、fthisEuropeanStandard,thefollowingtermsanddefinitionsapply. 3.1 liquidfuels lightfueloils,andheavyfueloilswhichneedpreheatingforproperatomisation 3.2 gaseousfuels standardizedqualitydifferentiatedmainlybytheirrelativedensity 3.2.1 lightgases withrelativedensitybelow1,3e.g.naturalgas,cokeovengas,blas
27、tfurnacegas NOTE NaturalgasinaccordancewithISO6976. 3.2.2 heavygases withrelativedensitiesexceeding1,3e.g.liquefiedpetroleumgases,themaincomponentsofwhicharepropane andbutane 3.3 burners devicesfortheintroductionoffuelandairintoacombustionchamberatrequiredvelocities,turbulenceandlocal fuelconcentrat
28、iontoestablishandmaintainproperignitionandstablecombustionofthefuel 3.4 burnermanagementsystem performsapredeterminedsequenceofactionsandalwaysoperatesinconjunctionwithaflamemonitorthatreacts tosignalsfromcontrolandsafetydevices,givescontrolcommands,controlsthestartupsequence,supervisesthe burnerope
29、ration,andcausescontrolledshutdownandlockoutEN129537:2002(E) 5 3.5 firingsystem totalequipmentrequiredforthecombustionoffuelsincludingtheinstallationsforthestorage,preparation,and supplyoffuels,thecombustionairsupply,theburner(s),thefluegasdischarge,andallrelatedcontrolandmoni toringdevices NOTE Afl
30、uegasrecirculationsystemcanbeinstalledasanintegralpartofthefiringsystem. 3.6 firingsystemheatinput heatinputintothecombustionchamber,includingthereserverequiredforloadcontrolatwhichtheboilercanbe safelyoperated NOTE Themassflowofthefuelsuppliedmultipliedbythenetcalorificvalue. 3.7 flamemonitor devic
31、ewhichdetectsthepresenceorabsenceorbreakawayoftheflameandtransmitsasignaltothecontrolde vice,andgenerally,consistsofasensingdevice(ifnecessarywithamplifier)andswitchingequipment 3.8 fluegasrecirculation returnoffluegasfromdownstreamoftheflamezoneorfromthefluegasexitbyhydrodynamicpressuredifference o
32、raseparatefanintotheairregisteroftheburnerordirectlyintothecombustionchamber 3.9 limiters devicethat,onreachingafixedvalue(e.g.pressure,temperature,flow,waterlevel)isusedtointerruptandlockout theenergysupplyandrequiresmanualunlockingbeforerestart 3.10 lockout isolationofenergysupplywhichrequiresaman
33、ualinterventiontoreinstate NOTE SeeEN676fordefinitionofnonvolatilelockout. 3.11 masterfueltrip deviceforrapidautomaticshutoffofallfuelsuppliestotheboilerareaintheeventofdangerwhichmayactby automatic,manualoremergencyswitchinitiationevenifapossibleelectricalormechanicalfaultoccurs 3.12 firingrateofth
34、eburner rateatwhichtheburnermaybeoperated 3.13 multifuelburners burnersinwhichmorethanonefuelisburnedeithersimultaneouslyorseparately 3.14 purgingofthefluegaspasses forcedflowofairthroughthecombustionchamber,fluegaspasses,andassociatedductswhicheffectivelyre movesanycombustibleproductsandreplacesthe
35、mwithair 3.16 relativedensity ratioofthedensityofthegastothedensityofdryairunderequalconditionsofpressureandtemperatureEN129537:2002(E) 6 3.17 returnflowatomizer oilburnerswhereaportionofthequantityofoilsuppliedtotheburnerviatheflowlinedoesnotflowfromaburner gunintothecombustionchamber,butflowsbackw
36、ardsintothestoragetankorthesuctionsideofthepumpviaa separatereturnline,theoutputbeingadjustedbyacontroldeviceinthereturnline 4Fuel supply 4.1 Fueltransferandpreparation 4.1.1 Thefuelsupplylineshallbeequippedwithamasterfueltripwhichshallbepositionedinasafelocation.It shallcutoffthefuelsupplytotheboil
37、erroomortheboilerareaandcanbeoperatedmanuallyorbyremotecontrol, orbyanemergencyswitch. 4.1.2 Someliquidfuelssuchasheavyfueloilshallbepreheatingtoachievetheviscosityrequiredforproperat omisation. Anyheatsourcethatcanbecutoffimmediatelyifrequired,andtheratingofwhichcanbeautomaticallycontrolled, canbeu
38、sedforoilpreheating.Openflamesshallnotbepermitted.Thefueloiltemperatureshallnotattainthefuel oilflashpointatatmospherepressure. Eachfueloilpreheatingsystemshallbeautomaticallytemperaturecontrolled.Atemperatureindicatorshallbefitted downstreamofthepreheatingsystem.Asuitablecutoutfortheheatingsourcesh
39、allbeprovidedtoprevent overheatingoftheoil.Inaddition,aminimumtemperaturelimitingdeviceshallalsobeprovidedtoensureadequate atomisation. Forpressurizedpreheaters,therequirementsforpressurevesselsshallbeapplied,includingoverpressure protection.Anyescapingoilshallbesafelydischarged. 4.2Fuel lines 4.2.1
40、 Fuellines,includinggasketsandvalvesshallbedesignedandlaidouttowithstandthemechanical,chemi calandthermalloadstowhichtheyareexposedinservice.Onlyfireresistantpipingmaterialshallbepermitted. Isolationvalvesshallbeprovidedbetweentheburnerandthefuellines. 4.2.2 Thefuellinesshallbetightandproperlyfixed.
41、Insystemssubjectedtovibrationstheresultingstresses shallbeminimizedtoavoidleakage. 4.2.3 Flexiblelinesmaybeusedforconnectingtheburnertothefixedpiping.Forfueloilinthepreheatedstate, onlyjacketedmetallichosesshallbepermitted.Isolatedvalvesshallbeinstalled. Flexiblelinesmaybeusedinsteadofcompensatorsat
42、protectedlocations.Foroil,theselinesshouldbejacketed metallichoses,otherwisetheyneedaprotectivedeviceconsistingofe.g.adoublelinewithanoilmonitorwhich switchesofftheoilsupplypumpincaseofanoilleakage.Forgas,theselinesshallbecorrugatedsteelpipes. Allflexiblelinesshallbeasshortaspossibleandbeinstalledwi
43、thadequatebendingradii.Theflexiblelinesandthe connectionsshallcarrythemanufacturerssymbolsandindicationofthenominalcarrypressure.Thedesign pressureshallbeatleast1,5timesthemaximumallowablepressure.Thelinesshallbeprotectedagainst unacceptableexternalheating. 4.2.4 Toprotectfuellinesagainstunacceptablehighpressure,automaticcontrolandsafetydevicesshallbepro vided.Foroillines,pressurereliefvalvesshallbeinstalled.Protectionofoilpumpsandtheeffectofpressurerisein linesbetweenclosedshutoffdevicesduetoheatingshallalsobetakenintoconsideration.Forgaslinesthenec essarypr
