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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(yùn)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(yùn)行，應(yīng)該對影響電除塵器效率的因素進(jìn)行分析，并加強(qiáng)對電除塵器運(yùn)行、維護(hù)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(shè)計(jì)運(yùn)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(yùn)行的重要因素之一。電除塵器直流高壓由380V交流電流經(jīng)可控硅高壓整流設(shè)備供給，除塵器電場阻抗對高壓供電裝置來說是一個(gè)變化的負(fù)載。當(dāng)電場阻抗升高、電流變小時(shí)，要求設(shè)備能自動(dòng)升壓；而當(dāng)電場阻抗降低、電流變大時(shí)，要求設(shè)備能自動(dòng)降壓以保持設(shè)定的電流。整流變壓器內(nèi)部的電壓、電流取樣電阻，引進(jìn)負(fù)反饋信號，經(jīng)微機(jī)智能處理后移相控制可控硅的導(dǎo)通角，改變負(fù)載輸出電壓，達(dá)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(shè)備制造廠生產(chǎn)的控制器對
機(jī)械外文翻譯--保證電除塵器高效穩(wěn)定運(yùn)行的措施.doc
