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机械外文翻译--保证电除尘器高效稳定运行的措施.doc

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机械外文翻译--保证电除尘器高效稳定运行的措施.doc

ToensurestableoperationofelectrostaticprecipitatorefficiencymeasuresESPisahighlyefficientdustcollector,hasbeenmoreandmoreusedbycoalfiredpowerplants.Electrostaticprecipitatorinordertomaintainlongterm,highperformanceandstableoperation,itshouldbeaffectingtheefficiencyofelectrostaticprecipitatorfactorsanalysis,andtothestrengtheningofelectrostaticprecipitatoroperation,maintenanceandoverhaulmanagement.1Affecttheefficiencyofelectrostaticprecipitatordustfactor1.1HighlowvoltagepowersupplycontroldevicedesignandoperationofthepoorReasonablecoronaESPpoweristoensuresafe,stableoperationofoneoftheimportantfactors.ESP380VDChighvoltagefromhighvoltagealternatingcurrentflowingthroughthyristorrectifierequipmentsupply,electricdustcollectorofhighvoltagepowersupplyimpedanceisaloadchange.ImpedancewhentheelectricfieldincreasedERhourrequirementsofequipmenttoautomaticallystepuplowerimpedancewhentheelectricfieldandcurrentbecomelarger,therequirementsofequipmenttoautomaticallystepdowninordertomaintainthecurrentsettings.Internaltransformerrectifiervoltageandcurrentsamplingresistor,theintroductionofnegativefeedbacksignals,processedbythemicrocomputerintelligentcontrolthyristorphaseshiftoftheconductionangle,theoutputvoltagetochangetheloadtothepurposeofoutput,sothatthemosteffectiveelectricfieldofcoronapower.However,somepowerandcontrolequipment,factoryproductioncontrolofthecontrollerofthedevicecharacteristicsandcontrolmethodsarenotperfectprotection,etc.,coupledwiththepowerplantoperationandmaintenancepersonnelofequipmentThereisacertainunderstandingoftheprinciplesoftheblindspot,resultinginpowersupplypooroperationofcontroldevices.1.2vibrationcleaningdeviceoperatingmodeunreasonableAtpresent,thermalpowerplantsinadditiontotheuseofelectricity,andallisvibrationcleaningmethods.Inthevibrationintensityanduniformityrequirementsaremet,thevibrationsystemcycletime,thewayisreasonablefortheefficiencyofelectrostaticprecipitatordustimpact.Vibrationcycle,theimpactonthecollectionefficiencyistobeabletomakewhencleaningoffthedustfromfallingintotheashbucketdirectlyblock.Vibrationcycleistoolong,foulingplatethickness,willreducethedustintheveryboardchargedtheconductiveproperties,reducingcollectionefficiencyvibrationcycleistooshort,dustwillbedispersedintofalling,havegivenrisetotheseconddust,thatisdepositedontheelectrostaticprecipitatordustcollectingonthepoleagainwithadustcollectorcurrents,inparticulartheelectricfieldattheendofthesecondpolardustwouldgreatlyreducetheefficiencyofelectrostaticprecipitator.Dustcausedbythesecondtherearemanyfactors,suchashighresistivitydust,resultinginanticoronaelectricfieldcollectingtheunevendistributionofthefluegasflowrateorflowratecausedbyhighturbulenceandswirl.Therefore,therequirementsoftheelectricfieldoffluegasflowrateofnotmorethan3m/s,thegeneraloperationoftheelectricfieldinthefluegasflowrate1.5m/sorso,andthepossibledistributionoffluegasflow,andthevibrationfrequencyofcleaningoffiscausedbydustSecondarydustfactor.Followcertainprocedures,usingappropriatetestmethods,establishtherightvibrationsystem,atthesametimestrengthenthegrayashbucketequipmentmaintenancetopreventgrayashblockedouttheBigDipper,canpreventtheoccurrenceofsecondarydust.1.3boileroperatingparametersdeviatefromnormalUnderthenormalloadintheboilerfluegasflow,exhaustgastemperature,fluegasdustconcentrationandotherparameterswiththedesignparametersofelectrostaticprecipitatororlessthesameasallthenormaloperationofelectrostaticprecipitator.Iftheboilerfluegasflowincreases,smoketemperature,fluegasdustconcentrationincreased,theelectrostaticprecipitatoroperatingconditionswilldeteriorate,sothatlowercollectionefficiency.Whentheboilerlowloadrunningtime,inordertostabilizecombustion,mustbeinputforcombustionofheavyoilordiesel,resultinginfluegastemperatureandincreaseintheviscousmaterial.Theseviscousmaterialshypertrophycausedbycathoderayanodeplatedeposition,resultingindecreasedefficiencyoftheelectricfieldofthedust.Ifvaporleaksintheboiler,fluegaswillincreasethehumidity,althoughinaveryshorttimebecauseofsmokeandquenchedandtemperedbylowerresistancethantheash,dustremovalefficiencywillbeincreased,butalittlelonger,willseriouslyfoulingESP,Inparticular,whenthedisclosureoflarge,plateorscale,willreducethelifeofprecipitator.1.4changesincoalIfcoalburningboilerchangesinthedesignofitscalorificvaluethancoalwithlowashcoalthanthedesignofhigh,itwillincreaseitscoal,flourmills,dust,ashequipmentwearandshortenthemaintenancecycleoftheequipment.Theuseoflowcalorificvaluecoal,theactualcoalfiredboilerswillincreasesothatthevolumeoffluegascontainingashincreased.ThiswillmakeESPmorethandealingwiththedesignoffluegasdustconcentrationvalues,collectionefficiencywillbeseriouslyaffected.Inordertoeliminatecoalfromtheimpactofchangesincollectionefficiencyofelectrostaticprecipitator,dustremovalequipmentinthesystemundernormalcircumstances,eachelectrostaticprecipitatorshouldbecarriedoutatleastoneofthecharacteristicsoftypicalcoalteststodeterminethecoal,electricity,vibrationefficiencyelectrostaticprecipitatorforthecombinedeffectoftheESPtofindthebestoperatingmode.2strengthentheelectrostaticprecipitatormaintenanceandrepairwork1StatePowerEnvironmentalProtectionproducedbyDJseriesofcomputercontrolledhighlowvoltagepowersupplydevices,anditsuseofadvancedhighpressurecontrolpartofthe8098singlechipandperipheralchips,control,protectionfunctions,simplestructure,easytousefeatures,andforthermalpowerplantboilercombustionemissionofdustflyashthanthechangesinresistanceprovidesawiderangeofpowersupplytorunavarietyofdifferentwaystomeettherequirementsofworkingconditions.Thispowersupplyequipmentfortheoriginaltransformation,thecentralplanecanbeachievedwithlongrangeandturbiditydustdetectorconstitutethefeedbacksignaloftheclosedloopcontrolelectrostaticprecipitator,totheeffectofenergyefficientoperation.Theirprotectionandalarmfunctionsinvolvedintheimportationofovercurrent,outputopencircuit,outputshortcircuit,undervoltageprotection,partialexcitation,SCRriskofopenandcriticaltemperature,thethermalpowerplantisalmostcoveredbytheoperationofelectrostaticprecipitatorforallfaulttypes.2effortstoimprovethestatusoftheoperationofelectrostaticprecipitator,strictlyenforcetheelectrostaticprecipitatoroperationandmaintenanceguidelines,theexistenceoftheoperationoftheequipmentfailuresandshortcomingsshouldbeintime,establishacomprehensive,reasonablemaintenanceandprojectcycle.3maintenancearea.Overhaulattheelectrostaticprecipitatorinovercast,anodespacingadjustments,andrecordthemeasurementresultsbeforeandafteradjustment.Toovercast,anodedevicevibrationequipmentmainlyelectricalvibration,reducingthebrowsermachine,shaft,bearings,torsionarmhammer,insulationconnectingrod,etc.toinspectthewearandhandlingofashsystems,insulation,heatingsystems,Doograylevelmeter,devicessuchaslockinggasinspectionanddebugging.4electricalconnection.Enforcingoverhaulofpreventivetestselectricalequipmentorderintheelectrostaticprecipitatortransformerrectifiersectionsofhighpressureandlowpressurereactor,insulatingsupportandconnectedcomponents,highvoltagedirectcurrentcablesandotherequipmentofthepilotprojectandtheexpressprovisionofthecycle,totriggerpowersupplydeviceperformancetesting,onavarietyofprotectionthroughoutthetrial,thehighlowvoltageelectricalcircuitandswitchinstrumentsseizedtheschool,andhangingrectifiertochangethecoreinspection.5ESPoveralldebuggingafteroverhaul.Aftertheoverhauloftherectifiertransformers,electricfieldtonoloadstepuptest,andruntimeconditionstotheratedcharacteristicsoftheUItestingofimportsandexportsoffluegastemperatureandpressuretestinginstructionsofTurbidimeter,lightingequipmentfortesting.Iftheconditionalwords,itshouldalsobeontheESPcollectionefficiencybeforeandafteroverhaulcomparisontest,totesttheeffectivenessofrepairwork.保证电除尘器高效稳定运行的措施电除尘器是一种高效的除尘器,已被越来越多的火力发电厂所采用。为了保持电除尘器长期、高效、稳定地运行,应该对影响电除尘器效率的因素进行分析,并加强对电除尘器运行、维护和检修的管理。1影响电除尘器除尘效率的因素1.1高低压供电控制装置设计运行不佳合理的电除尘器电晕功率是保证电除尘器安全、稳定运行的重要因素之一。电除尘器直流高压由380V交流电流经可控硅高压整流设备供给,除尘器电场阻抗对高压供电装置来说是一个变化的负载。当电场阻抗升高、电流变小时,要求设备能自动升压而当电场阻抗降低、电流变大时,要求设备能自动降压以保持设定的电流。整流变压器内部的电压、电流取样电阻,引进负反馈信号,经微机智能处理后移相控制可控硅的导通角,改变负载输出电压,达到稳定输出的目的,使电场获得最有效的电晕功率。然而有些电源及控制设备制造厂生产的控制器对

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