机械外文翻译--保证电除尘器高效稳定运行的措施.doc

ToensurestableoperationofelectrostaticprecipitatorefficiencymeasuresESPisahighlyefficientdustcollector,hasbeenmoreandmoreusedbycoal-firedpowerplants.Electrostaticprecipitatorinordertomaintainlong-term,high-performanceandstableoperation,itshouldbeaffectingtheefficiencyofelectrostaticprecipitatorfactorsanalysis,andtothestrengtheningofelectrostaticprecipitatoroperation,maintenanceandoverhaulmanagement.1Affecttheefficiencyofelectrostaticprecipitatordustfactor1.1High-low-voltagepowersupplycontroldevicedesignandoperationofthepoorReasonablecoronaESPpoweristoensuresafe,stableoperationofoneoftheimportantfactors.ESP380VDChighvoltagefromhigh-voltagealternatingcurrentflowingthroughthyristorrectifierequipmentsupply,electricdustcollectorofhigh-voltagepowersupplyimpedanceisaloadchange.ImpedancewhentheelectricfieldincreasedER-hourrequirementsofequipmenttoautomaticallystep-up；lowerimpedancewhentheelectricfieldandcurrentbecomelarger,therequirementsofequipmenttoautomaticallystep-downinordertomaintainthecurrentsettings.Internaltransformerrectifiervoltageandcurrentsamplingresistor,theintroductionofnegativefeedbacksignals,processedbythemicrocomputerintelligentcontrolthyristorphase-shiftoftheconductionangle,theoutputvoltagetochangetheloadtothepurposeofoutput,sothatthemosteffectiveelectricfieldofcoronapower.However,somepowerandcontrolequipment,factoryproductioncontrolofthecontrollerofthedevicecharacteristicsandcontrolmethodsarenotperfectprotection,etc.,coupledwiththepowerplantoperationandmaintenancepersonnelofequipmentThereisacertainunderstandingoftheprinciplesoftheblindspot,resultinginpowersupplypooroperationofcontroldevices.1.2vibrationcleaningdeviceoperatingmodeunreasonableAtpresent,thermalpowerplantsinadditiontotheuseofelectricity,andallisvibrationcleaningmethods.Inthevibrationintensityanduniformityrequirementsaremet,thevibrationsystem(cycletime,theway)isreasonablefortheefficiencyofelectrostaticprecipitatordustimpact.Vibrationcycle,theimpactonthecollectionefficiencyistobeabletomakewhencleaningoffthedustfromfallingintotheashbucketdirectlyblock.Vibrationcycleistoolong,foulingplatethickness,willreducethedustintheveryboardchargedtheconductiveproperties,reducingcollectionefficiency；vibrationcycleistooshort,dustwillbedispersedintofalling,havegivenrisetotheseconddust,thatisdepositedontheelectrostaticprecipitatordustcollectingonthepoleagainwithadustcollectorcurrents,inparticulartheelectricfieldattheendofthesecondpolardustwouldgreatlyreducetheefficiencyofelectrostaticprecipitator.Dustcausedbythesecondtherearemanyfactors,suchashighresistivitydust,resultinginanti-coronaelectricfieldcollectingtheunevendistributionofthefluegasflowrateorflowratecausedbyhighturbulenceandswirl.Therefore,therequirementsoftheelectricfieldoffluegasflowrateofnotmorethan3m/s,thegeneraloperationoftheelectricfieldinthefluegasflowrate1.5m/sorso,andthepossibledistributionoffluegasflow,andthevibrationfrequencyofcleaningoffiscausedbydustSecondarydustfactor.Followcertainprocedures,usingappropriatetestmethods,establishtherightvibrationsystem,atthesametimestrengthenthegrayashbucketequipmentmaintenancetopreventgrayashblockedouttheBigDipper,canpreventtheoccurrenceofsecondarydust.1.3boileroperatingparametersdeviatefromnormalUnderthenormalloadintheboilerfluegasflow,exhaustgastemperature,fluegasdustconcentrationandotherparameterswiththedesignparametersofelectrostaticprecipitatororlessthesameasallthenormaloperationofelectrostaticprecipitator.Iftheboilerfluegasflowincreases,smoketemperature,fluegasdustconcentrationincreased,theelectrostaticprecipitatoroperatingconditionswilldeteriorate,sothatlowercollectionefficiency.Whentheboilerlow-loadrunningtime,inordertostabilizecombustion,mustbeinputforcombustionofheavyoilordiesel,resultinginfluegastemperatureandincreaseintheviscousmaterial.Theseviscousmaterialshypertrophycausedbycathode-rayanodeplatedeposition,resultingindecreasedefficiencyoftheelectricfieldofthedust.Ifvaporleaksintheboiler,fluegaswillincreasethehumidity,althoughinaveryshorttimebecauseofsmokeandquenchedandtemperedbylowerresistancethantheash,dustremovalefficiencywillbeincreased,butalittlelonger,willseriouslyfoulingESP,Inparticular,whenthedisclosureoflarge,plateorscale,willreducethelifeofprecipitator.1.4changesincoalIfcoalburningboilerchangesinthedesignofitscalorificvaluethancoalwithlowashcoalthanthedesignofhigh,itwillincreaseitscoal,flourmills,dust,ashequipmentwearandshortenthemaintenancecycleoftheequipment.Theuseoflowcalorificvaluecoal,theactualcoal-firedboilerswillincreasesothatthevolumeoffluegascontainingashincreased.ThiswillmakeESPmorethandealingwiththedesignoffluegasdustconcentrationvalues,collectionefficiencywillbeseriouslyaffected.Inordertoeliminatecoalfromtheimpactofchangesincollectionefficiencyofelectrostaticprecipitator,dustremovalequipmentinthesystemundernormalcircumstances,eachelectrostaticprecipitatorshouldbecarriedoutatleastoneofthecharacteristicsoftypicalcoalteststodeterminethecoal,electricity,vibrationefficiencyelectrostaticprecipitatorforthecombinedeffectoftheESPtofindthebestoperatingmode.2strengthentheelectrostaticprecipitatormaintenanceandrepairwork(1)StatePowerEnvironmentalProtectionproducedbyDJseriesofcomputer-controlledhigh-low-voltagepowersupplydevices,anditsuseofadvancedhigh-pressurecontrolpartofthe8098single-chipandperipheralchips,control,protectionfunctions,simplestructure,easy-to-usefeatures,andforthermalpowerplantboilercombustionemissionofdust(flyash)thanthechangesinresistanceprovidesawiderangeofpowersupplytorunavarietyofdifferentwaystomeettherequirementsofworkingconditions.Thispowersupplyequipmentfortheoriginaltransformation,thecentralplanecanbeachievedwithlong-rangeandturbiditydustdetectorconstitutethefeedbacksignaloftheclosed-loopcontrolelectrostaticprecipitator,totheeffectofenergy-efficientoperation.Theirprotectionandalarmfunctionsinvolvedintheimportationofover-current,outputopen-circuit,outputshortcircuit,undervoltageprotection,partialexcitation,SCRriskofopenandcriticaltemperature,thethermalpowerplantisalmostcoveredbytheoperationofelectrostaticprecipitatorforallfaulttypes.(2)effortstoimprovethestatusoftheoperationofelectrostaticprecipitator,strictlyenforcetheelectrostaticprecipitatoroperationandmaintenanceguidelines，theexistenceoftheoperationoftheequipmentfailuresandshortcomingsshouldbeintime,establishacomprehensive,reasonablemaintenanceandprojectcycle.(3)maintenancearea.Overhaulattheelectrostaticprecipitatorinovercast,anodespacingadjustments,andrecordthemeasurementresultsbeforeandafteradjustment.Toovercast,anodedevicevibrationequipment(mainlyelectricalvibration,reducingthebrowsermachine,shaft,bearings,torsionarmhammer,insulationconnectingrod,etc.)toinspectthewearandhandling；ofashsystems,insulation,heatingsystems,Doo-graylevelmeter,devicessuchaslockinggasinspectionanddebugging.(4)electricalconnection.Enforcingoverhaulofpreventivetestselectricalequipmentorderintheelectrostaticprecipitatortransformerrectifiersectionsofhighpressureandlowpressurereactor,insulatingsupportandconnectedcomponents,highvoltagedirectcurrentcablesandotherequipmentofthepilotprojectandtheexpressprovisionofthecycle,totriggerpowersupplydeviceperformancetesting,onavarietyofprotectionthroughoutthetrial,thehigh-lowvoltageelectricalcircuitandswitchinstrumentsseizedtheschool,andhangingrectifiertochangethecoreinspection.(5)ESPoveralldebuggingafteroverhaul.Aftertheoverhauloftherectifiertransformers,electricfieldtono-loadstep-uptest,andrun-timeconditionstotheratedcharacteristicsoftheU-Itesting；ofimportsandexportsoffluegastemperatureandpressuretestinginstructions；ofTurbidimeter,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