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1、ToensurestableoperationofelectrostaticprecipitatorefficiencymeasuresESPisahighlyefficientdustcollector,hasbeenmoreandmoreusedbycoal-firedpowerplants.Electrostaticprecipitatorinordertomaintainlong-term,high-performanceandstableoperation,itshouldbeaffectingtheefficiencyofelectrostaticprecipitatorfacto
2、rsanalysis,andtothestrengtheningofelectrostaticprecipitatoroperation,maintenanceandoverhaulmanagement.1Affecttheefficiencyofelectrostaticprecipitatordustfactor1.1High-low-voltagepowersupplycontroldevicedesignandoperationofthepoorReasonablecoronaESPpoweristoensuresafe,stableoperationofoneoftheimporta
3、ntfactors.ESP380VDChighvoltagefromhigh-voltagealternatingcurrentflowingthroughthyristorrectifierequipmentsupply,electricdustcollectorofhigh-voltagepowersupplyimpedanceisaloadchange.ImpedancewhentheelectricfieldincreasedER-hourrequirementsofequipmenttoautomaticallystep-up；lowerimpedancewhentheelectri
4、cfieldandcurrentbecomelarger,therequirementsofequipmenttoautomaticallystep-downinordertomaintainthecurrentsettings.Internaltransformerrectifiervoltageandcurrentsamplingresistor,theintroductionofnegativefeedbacksignals,processedbythemicrocomputerintelligentcontrolthyristorphase-shiftoftheconductionan
5、gle,theoutputvoltagetochangetheloadtothepurposeofoutput,sothatthemosteffectiveelectricfieldofcoronapower.However,somepowerandcontrolequipment,factoryproductioncontrolofthecontrollerofthedevicecharacteristicsandcontrolmethodsarenotperfectprotection,etc.,coupledwiththepowerplantoperationandmaintenance
6、personnelofequipmentThereisacertainunderstandingoftheprinciplesoftheblindspot,resultinginpowersupplypooroperationofcontroldevices.1.2vibrationcleaningdeviceoperatingmodeunreasonableAtpresent,thermalpowerplantsinadditiontotheuseofelectricity,andallisvibrationcleaningmethods.Inthevibrationintensityand
7、uniformityrequirementsaremet,thevibrationsystem(cycletime,theway)isreasonablefortheefficiencyofelectrostaticprecipitatordustimpact.Vibrationcycle,theimpactonthecollectionefficiencyistobeabletomakewhencleaningoffthedustfromfallingintotheashbucketdirectlyblock.Vibrationcycleistoolong,foulingplatethick
8、ness,willreducethedustintheveryboardchargedtheconductiveproperties,reducingcollectionefficiency；vibrationcycleistooshort,dustwillbedispersedintofalling,havegivenrisetotheseconddust,thatisdepositedontheelectrostaticprecipitatordustcollectingonthepoleagainwithadustcollectorcurrents,inparticulartheelec
9、tricfieldattheendofthesecondpolardustwouldgreatlyreducetheefficiencyofelectrostaticprecipitator.Dustcausedbythesecondtherearemanyfactors,suchashighresistivitydust,resultinginanti-coronaelectricfieldcollectingtheunevendistributionofthefluegasflowrateorflowratecausedbyhighturbulenceandswirl.Therefore,
10、therequirementsoftheelectricfieldoffluegasflowrateofnotmorethan3m/s,thegeneraloperationoftheelectricfieldinthefluegasflowrate1.5m/sorso,andthepossibledistributionoffluegasflow,andthevibrationfrequencyofcleaningoffiscausedbydustSecondarydustfactor.Followcertainprocedures,usingappropriatetestmethods,e
11、stablishtherightvibrationsystem,atthesametimestrengthenthegrayashbucketequipmentmaintenancetopreventgrayashblockedouttheBigDipper,canpreventtheoccurrenceofsecondarydust.1.3boileroperatingparametersdeviatefromnormalUnderthenormalloadintheboilerfluegasflow,exhaustgastemperature,fluegasdustconcentratio
12、nandotherparameterswiththedesignparametersofelectrostaticprecipitatororlessthesameasallthenormaloperationofelectrostaticprecipitator.Iftheboilerfluegasflowincreases,smoketemperature,fluegasdustconcentrationincreased,theelectrostaticprecipitatoroperatingconditionswilldeteriorate,sothatlowercollection
13、efficiency.Whentheboilerlow-loadrunningtime,inordertostabilizecombustion,mustbeinputforcombustionofheavyoilordiesel,resultinginfluegastemperatureandincreaseintheviscousmaterial.Theseviscousmaterialshypertrophycausedbycathode-rayanodeplatedeposition,resultingindecreasedefficiencyoftheelectricfieldoft
14、hedust.Ifvaporleaksintheboiler,fluegaswillincreasethehumidity,althoughinaveryshorttimebecauseofsmokeandquenchedandtemperedbylowerresistancethantheash,dustremovalefficiencywillbeincreased,butalittlelonger,willseriouslyfoulingESP,Inparticular,whenthedisclosureoflarge,plateorscale,willreducethelifeofpr
15、ecipitator.1.4changesincoalIfcoalburningboilerchangesinthedesignofitscalorificvaluethancoalwithlowashcoalthanthedesignofhigh,itwillincreaseitscoal,flourmills,dust,ashequipmentwearandshortenthemaintenancecycleoftheequipment.Theuseoflowcalorificvaluecoal,theactualcoal-firedboilerswillincreasesothatthe
16、volumeoffluegascontainingashincreased.ThiswillmakeESPmorethandealingwiththedesignoffluegasdustconcentrationvalues,collectionefficiencywillbeseriouslyaffected.Inordertoeliminatecoalfromtheimpactofchangesincollectionefficiencyofelectrostaticprecipitator,dustremovalequipmentinthesystemundernormalcircum
17、stances,eachelectrostaticprecipitatorshouldbecarriedoutatleastoneofthecharacteristicsoftypicalcoalteststodeterminethecoal,electricity,vibrationefficiencyelectrostaticprecipitatorforthecombinedeffectoftheESPtofindthebestoperatingmode.2strengthentheelectrostaticprecipitatormaintenanceandrepairwork(1)S
18、tatePowerEnvironmentalProtectionproducedbyDJseriesofcomputer-controlledhigh-low-voltagepowersupplydevices,anditsuseofadvancedhigh-pressurecontrolpartofthe8098single-chipandperipheralchips,control,protectionfunctions,simplestructure,easy-to-usefeatures,andforthermalpowerplantboilercombustionemissiono
19、fdust(flyash)thanthechangesinresistanceprovidesawiderangeofpowersupplytorunavarietyofdifferentwaystomeettherequirementsofworkingconditions.Thispowersupplyequipmentfortheoriginaltransformation,thecentralplanecanbeachievedwithlong-rangeandturbiditydustdetectorconstitutethefeedbacksignaloftheclosed-loo
20、pcontrolelectrostaticprecipitator,totheeffectofenergy-efficientoperation.Theirprotectionandalarmfunctionsinvolvedintheimportationofover-current,outputopen-circuit,outputshortcircuit,undervoltageprotection,partialexcitation,SCRriskofopenandcriticaltemperature,thethermalpowerplantisalmostcoveredbytheo
21、perationofelectrostaticprecipitatorforallfaulttypes.(2)effortstoimprovethestatusoftheoperationofelectrostaticprecipitator,strictlyenforcetheelectrostaticprecipitatoroperationandmaintenanceguidelines，theexistenceoftheoperationoftheequipmentfailuresandshortcomingsshouldbeintime,establishacomprehensive
22、,reasonablemaintenanceandprojectcycle.(3)maintenancearea.Overhaulattheelectrostaticprecipitatorinovercast,anodespacingadjustments,andrecordthemeasurementresultsbeforeandafteradjustment.Toovercast,anodedevicevibrationequipment(mainlyelectricalvibration,reducingthebrowsermachine,shaft,bearings,torsion
23、armhammer,insulationconnectingrod,etc.)toinspectthewearandhandling；ofashsystems,insulation,heatingsystems,Doo-graylevelmeter,devicessuchaslockinggasinspectionanddebugging.(4)electricalconnection.Enforcingoverhaulofpreventivetestselectricalequipmentorderintheelectrostaticprecipitatortransformerrectif
24、iersectionsofhighpressureandlowpressurereactor,insulatingsupportandconnectedcomponents,highvoltagedirectcurrentcablesandotherequipmentofthepilotprojectandtheexpressprovisionofthecycle,totriggerpowersupplydeviceperformancetesting,onavarietyofprotectionthroughoutthetrial,thehigh-lowvoltageelectricalci
25、rcuitandswitchinstrumentsseizedtheschool,andhangingrectifiertochangethecoreinspection.(5)ESPoveralldebuggingafteroverhaul.Aftertheoverhauloftherectifiertransformers,electricfieldtono-loadstep-uptest,andrun-timeconditionstotheratedcharacteristicsoftheU-Itesting；ofimportsandexportsoffluegastemperature
26、andpressuretestinginstructions；ofTurbidimeter,lightingequipmentfortesting.Iftheconditionalwords,itshouldalsobeontheESPcollectionefficiencybeforeandafteroverhaulcomparisontest,totesttheeffectivenessofrepairwork.保證電除塵器高效穩(wěn)定運行的措施電除塵器是一種高效的除塵器，已被越來越多的火力發(fā)電廠所采用。為了保持電除塵器長期、高效、穩(wěn)定地運行，應該對影響電除塵器效率的因素進行分析，并加強對電除塵器運行、維護和檢修的管理。1影響電除塵器除塵效率的因素1.1高低壓供電控制裝置設計運行不佳合理的電除塵器電暈功率是保證電除塵器安全、穩(wěn)定運行的重要因素之一。電除塵器直流高壓由380V交流電流經可控硅高壓整流設備供給，除塵器電場阻抗對高壓供電裝置來說是一個變化的負載。當電場阻抗升高、電流變小時，要求設備能自動升壓；而當電場阻抗降低、電流變大時，要求設備能自動降壓以保持設定的電流。整流變壓器內部的電壓、電流取樣電阻，引進負反饋信號，經微機智能處理后移相控制可控硅的導通角，改變負載輸出電壓，達到穩(wěn)定輸出的目的，使電場獲得最有效的電暈功率。然而有些電源及控制設備制造廠生產的控制器對
機械外文翻譯--保證電除塵器高效穩(wěn)定運行的措施.doc
