简介：Themicroporesilencerwasdevelopeddomesticallyonanewprincipleandhasbeensuccessfullyusedinpowerplantssincetheearlyeighties.Duetotheuniquefeaturesofgreatnoisereduction,compactconfiguration,light,stableperformanceandconvenientforinstallation&maintenance,thecomprehensiveperformanceissuperiortotheconventionalsilencerofcompound-impedancetype,themicroporesilencerhasbeenwidelyadoptedbypowerplantsinChina.First,themicroporesilencerissuccessfullyusedinboiler’ssteamblow-off&safetyvalvesteamexhaustduringstart-upfornoisecontrol;laterusedtothenoisecontrolforsteamblow-offofsteampiping

简介：Amathematicalmodelforatmosphericstagedcirculatingfluidizedbedcombustion,whichtakesfluiddynamics,combustion,heattransfer,pollutantsformationandretention,intoaccountwasdevelopedintheinstituteofEngineeringThermophysics(IET)recently.Themodelofgassolidflowatthebottomofthecombustorwastreatedbythetwo-phasetheoryoffluidizedbedandintheupperregionasacore-annulusflowstructure.ThechemicalspeciesCO,CO2,H2,H2O,CH4,O2andN2wereconsideredinthereactionprocess.Themathematicalmodelconsistedofsub-modelesoffluidnamics,coalheterogeneousandgashomogeneouschemicalreactions.heattransfer,particlefragmentationandattrition,massandenergybalancetec.Thedevelopedcodewasappliedtosimulateanoperatingstagedcirculatingfluidizedbedcombustionboilerofearlydesignandtheresultswereingoodagreementwiththeoperatingdata.Themainsubmodelsandsimulationresultsaregiveninthispaoper.

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简介：Theboilerisoneofthekeypartsofpowerstation.Monitoringtheoperationoftheboilerautomatically,continuouslyandaccuratelyisveryimportant.Incaseofmalfunctions,anexpertsystemmightbehelpfultofindthesourcesoffaults,andthereafterwillassisttheoperatortoactcorrectlyandtopreventthefaultfromfurtherdevelopment.Inthispaper,asimulationstudyofanexpertsystem,whichcandiagnosetherunningfaultsofboilersystem,isconducted.Shallowanddeeptwo-layerknowledgebasestructureisusedinthistwolayersofknowledgebase.So.thiskindofexpertsystemcanovercomethedisadvantagesoftheoldtypesofexpertsystems,whichareonlyabletodealwithexperiencerulesbase.Asimulatorofpowerboilerisusedfortheresearchonfaultdiagnoseexpertsystem.Thisboilersimulatorgivesallnecessaryinformationforthediagnosis.Theknowledgebaseofexpertsystemisbuiltinhierarchies,sothespeedofreasoningmaybeinvreased.Afterthereasoningthesys

简介：Theeffectofpressureoncombustionandheattransferisanalyzed.Theresearchisbasedonthebasiccombustionandheattransfertheorem.Acorrectionfortheheatcalculationmethodforpressurizedfurnaceismadeonthebasisofthenormalpressurecase.Thecorrectiontakestheeffectofpressurizingintoaccount.Theresultsshowthatthecorrectionisreasonableandthemethodisapplicabletocombustionandheattransferofthemarinesuperchargedboiler.

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简介：OnDecember28,2000,theretrofittingprojectbyusing410t/hCFBCboilerinFengyiPowerPlant,JiangxiProvincewasstartedformally,whichindicatesthattheresearchanddevelopmentofcleancoalcombustiontechnologyinChinahasmadeasignificantbreakthrough.The410t/hCFBCboileradoptedint

简介：TheconstructionscaleofPFBC-CCdemonstrationprojectis:toinstalltwosetsofPFBCboilerwithinputpowerof200MWeach,twosetsofimported17MWclassgasturbineandrelevantkeyequipment,andequiponesetofdomesticallymade173.5MWcondensingtypeturbo-generatorunit.Thetotalcapacit

简介：Thecapabilitytoperformfastload-followinghasbeenanimportantissueinthepowerindustry.Anoutputtrackingcontrolsystemofaboiler-turbineunitisdeveloped.Thesystemiscomposedofstableinversionandfeedbackcontroller.Thestableinversionisimplementedasafeedforwardcontrollertoimprovetheload-followingcapability,andthefeedbackcontrollerisutilizedtoguaranteethestabilityandrobustnessofthewholesystem.Loop-shapingH∞methodisusedtodesignthefeedbackcontrollerandthefinalcontrollerisreducedtoamultivariablePIform.Theoutputtrackingcontrolsystemtakesaccountofthemultivariable,nonlinearandcouplingbehaviorofboiler-turbinesystem,andthesimulationtestsshowthatthecontrolsystemworkswellandcanbewidelyapplied.

简介：High-temperaturecorrosionisaseriousproblemforthewater-walltubesofboilersusedinthermalpowerplants.Oxidation,sulfidationandmoltensaltcorrosionaremaincorrosionways.Thereinto,themostseverecorrosionoccursinmoltensaltcorrosionenvironment.Materialsrichinoxidesformers,suchaschromiumandaluminum,areneededtoresistcorrosioninhigh-temperatureandcorrosiveenvironment,butprocessabilityofsuchbulkalloysisverylimited.Highvelocityelectricarcspraying(HVAS)technologyisadoptedtoproducecoatingswithhighcorrosionresistance.Bycomparison,NiCr(Ni-45Cr-4Ti)isrecommendedasapromisingalloycoatingforthewater-walltubes,whichcanevenresistmoltensaltcorrosionattack.Inthestudyofcorrosionmechanism,themodernmaterialanalysismethods,suchasscanningelectronmicroscopy(SEM),X-raydiffractometry(XRD)andenergydispersivespectrometry(EDS),areused.ItisfoundthatthecorrosionresistancesofNiCrandFeCrAIcoatingsaremuchbetterthanthatof20gsteel,thattheNiCrcoatingshavethebestanti-corrosionproperties,andthattheNiCrcoatingshaveslightlylowerporesthanFeCrAIcoatings.Itistestifiedthatcorrosionresistanceofcoatingsismainlydeterminedbychromiumcontent,andthemicrostructureofacoatingisasimportantasthechemicalcompositionofthematerial.Inaddition,thefracturemechanismsofcoatingsinthecycleofheatingandcoolingareputforward.Thedifferenceofthethermalphysicalpropertiesbetweencoatingsandbasemetalsresultsinthethermalstressinsidethecoatings.Consequently,thecoatingsspallfromthebasemetal.

简介：Thecombustionperformanceoftheboilerlargelydependsonthecoaltype.Lotsofexperimentalresearchshowsthatdifferentfuelshavedifferentcombustioncharacteristics.ItisobviousthatfuelwillchangethewholeoperatingperformanceofCirculatingFluidizedBedCombustion(CFBC).Weknoweveninapilot-scalerunningboiler,themeasurementofsomeparametersisdifficultandcostly.Therefore,wedevelopedthewayofsimulationtoevaluatethecombustionperformanceofChinesecoalsinCFB,Thesimulationresultsshowthat,differentcoalswillresultindifferentcoalparticlediameterandcominutiondependingontheirmineralcomponentandthechangewillaffectthedistributionofashinCFBCsystem.Inaword.thecomputationalresultsareinaccordancewithexperimentalresultsqualitativelybuttherearesomedifferencesquantitatively.

简介：300MWCFBCdemonstrationprojectinBaimaPowerPlant,SichuanProvinceisabackingprojectofimportingthedesignandmanufacturingtechnologyoflargesizeCFBCboilerbyusingtechnologyandtradecooperationmode.Thetotalprojectinvestmentamountstoabout1.8billionyuan(RMB),witha300MW