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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,HASBEENMOREANDMOREUSEDBYCOALFIREDPOWERPLANTSELECTROSTATICPRECIPITATORINORDERTOMAINTAINLONGTERM,HIGHPERFORMANCEANDSTABLEOPERATION,ITSHOULDBEAFFECTINGTHEEFFICIENCYOFELECTROSTATICPRECIPITATORFACTORSANALYSIS,ANDTOTHESTRENGTHENINGOFELECTROSTATICPRECIPITATOROPERATION,MAINTENANCEANDOVERHAULMANAGEMENT1AFFECTTHEEFFICIENCYOFELECTROSTATICPRECIPITATORDUSTFACTOR11HIGHLOWVOLTAGEPOWERSUPPLYCONTROLDEVICEDESIGNANDOPERATIONOFTHEPOORREASONABLECORONAESPPOWERISTOENSURESAFE,STABLEOPERATIONOFONEOFTHEIMPORTANTFACTORSESP380VDCHIGHVOLTAGEFROMHIGHVOLTAGEALTERNATINGCURRENTFLOWINGTHROUGHTHYRISTORRECTIFIEREQUIPMENTSUPPLY,ELECTRICDUSTCOLLECTOROFHIGHVOLTAGEPOWERSUPPLYIMPEDANCEISALOADCHANGEIMPEDANCEWHENTHEELECTRICFIELDINCREASEDERHOURREQUIREMENTSOFEQUIPMENTTOAUTOMATICALLYSTEPUP;LOWERIMPEDANCEWHENTHEELECTRICFIELDANDCURRENTBECOMELARGER,THEREQUIREMENTSOFEQUIPMENTTOAUTOMATICALLYSTEPDOWNINORDERTOMAINTAINTHECURRENTSETTINGSINTERNALTRANSFORMERRECTIFIERVOLTAGEANDCURRENTSAMPLINGRESISTOR,THEINTRODUCTIONOFNEGATIVEFEEDBACKSIGNALS,PROCESSEDBYTHEMICROCOMPUTERINTELLIGENTCONTROLTHYRISTORPHASESHIFTOFTHECONDUCTIONANGLE,THEOUTPUTVOLTAGETOCHANGETHELOADTOTHEPURPOSEOFOUTPUT,SOTHATTHEMOSTEFFECTIVEELECTRICFIELDOFCORONAPOWERHOWEVER,SOMEPOWERANDCONTROLEQUIPMENT,FACTORYPRODUCTIONCONTROLOFTHECONTROLLEROFTHEDEVICECHARACTERISTICSANDCONTROLMETHODSARENOTPERFECTPROTECTION,ETC,COUPLEDWITHTHEPOWERPLANTOPERATIONANDMAINTENANCEPERSONNELOFEQUIPMENTTHEREISACERTAINUNDERSTANDINGOFTHEPRINCIPLESOFTHEBLINDSPOT,RESULTINGINPOWERSUPPLYPOOROPERATIONOFCONTROLDEVICES12VIBRATIONCLEANINGDEVICEOPERATINGMODEUNREASONABLEATPRESENT,THERMALPOWERPLANTSINADDITIONTOTHEUSEOFELECTRICITY,ANDALLISVIBRATIONCLEANINGMETHODSINTHEVIBRATIONINTENSITYANDUNIFORMITYREQUIREMENTSAREMET,THEVIBRATIONSYSTEMCYCLETIME,THEWAYISREASONABLEFORTHEEFFICIENCYOFELECTROSTATICPRECIPITATORDUSTIMPACTVIBRATIONCYCLE,THEIMPACTONTHECOLLECTIONEFFICIENCYISTOBEABLETOMAKEWHENCLEANINGOFFTHEDUSTFROMFALLINGINTOTHEASHBUCKETDIRECTLYBLOCKVIBRATIONCYCLEISTOOLONG,FOULINGPLATETHICKNESS,WILLREDUCETHEDUSTINTHEVERYBOARDCHARGEDTHECONDUCTIVEPROPERTIES,REDUCINGCOLLECTIONEFFICIENCY;VIBRATIONCYCLEISTOOSHORT,DUSTWILLBEDISPERSEDINTOFALLING,HAVEGIVENRISETOTHESECONDDUST,THATISDEPOSITEDONTHEELECTROSTATICPRECIPITATORDUSTCOLLECTINGONTHEPOLEAGAINWITHADUSTCOLLECTORCURRENTS,INPARTICULARTHEELECTRICFIELDATTHEENDOFTHESECONDPOLARDUSTWOULDGREATLYREDUCETHEEFFICIENCYOFELECTROSTATICPRECIPITATORDUSTCAUSEDBYTHESECONDTHEREAREMANYFACTORS,SUCHASHIGHRESISTIVITYDUST,RESULTINGINANTICORONAELECTRICFIELDCOLLECTINGTHEUNEVENDISTRIBUTIONOFTHEFLUEGASFLOWRATEORFLOWRATECAUSEDBYHIGHTURBULENCEANDSWIRLTHEREFORE,THEREQUIREMENTSOFTHEELECTRICFIELDOFFLUEGASFLOWRATEOFNOTMORETHAN3M/S,THEGENERALOPERATIONOFTHEELECTRICFIELDINTHEFLUEGASFLOWRATE15M/SORSO,ANDTHEPOSSIBLEDISTRIBUTIONOFFLUEGASFLOW,ANDTHEVIBRATIONFREQUENCYOFCLEANINGOFFISCAUSEDBYDUSTSECONDARYDUSTFACTORFOLLOWCERTAINPROCEDURES,USINGAPPROPRIATETESTMETHODS,ESTABLISHTHERIGHTVIBRATIONSYSTEM,ATTHESAMETIMESTRENGTHENTHEGRAYASHBUCKETEQUIPMENTMAINTENANCETOPREVENTGRAYASHBLOCKEDOUTTHEBIGDIPPER,CANPREVENTTHEOCCURRENCEOFSECONDARYDUST13BOILEROPERATINGPARAMETERSDEVIATEFROMNORMALUNDERTHENORMALLOADINTHEBOILERFLUEGASFLOW,EXHAUSTGASTEMPERATURE,FLUEGASDUSTCONCENTRATIONANDOTHERPARAMETERSWITHTHEDESIGNPARAMETERSOFELECTROSTATICPRECIPITATORORLESSTHESAMEASALLTHENORMALOPERATIONOFELECTROSTATICPRECIPITATORIFTHEBOILERFLUEGASFLOWINCREASES,SMOKETEMPERATURE,FLUEGASDUSTCONCENTRATIONINCREASED,THEELECTROSTATICPRECIPITATOROPERATINGCONDITIONSWILLDETERIORATE,SOTHATLOWERCOLLECTIONEFFICIENCYWHENTHEBOILERLOWLOADRUNNINGTIME,INORDERTOSTABILIZECOMBUSTION,MUSTBEINPUTFORCOMBUSTIONOFHEAVYOILORDIESEL,RESULTINGINFLUEGASTEMPERATUREANDINCREASEINTHEVISCOUSMATERIALTHESEVISCOUSMATERIALSHYPERTROPHYCAUSEDBYCATHODERAYANODEPLATEDEPOSITION,RESULTINGINDECREASEDEFFICIENCYOFTHEELECTRICFIELDOFTHEDUSTIFVAPORLEAKSINTHEBOILER,FLUEGASWILLINCREASETHEHUMIDITY,ALTHOUGHINAVERYSHORTTIMEBECAUSEOFSMOKEANDQUENCHEDANDTEMPEREDBYLOWERRESISTANCETHANTHEASH,DUSTREMOVALEFFICIENCYWILLBEINCREASED,BUTALITTLELONGER,WILLSERIOUSLYFOULINGESP,INPARTICULAR,WHENTHEDISCLOSUREOFLARGE,PLATEORSCALE,WILLREDUCETHELIFEOFPRECIPITATOR14CHANGESINCOALIFCOALBURNINGBOILERCHANGESINTHEDESIGNOFITSCALORIFICVALUETHANCOALWITHLOWASHCOALTHANTHEDESIGNOFHIGH,ITWILLINCREASEITSCOAL,FLOURMILLS,DUST,ASHEQUIPMENTWEARANDSHORTENTHEMAINTENANCECYCLEOFTHEEQUIPMENTTHEUSEOFLOWCALORIFICVALUECOAL,THEACTUALCOALFIREDBOILERSWILLINCREASESOTHATTHEVOLUMEOFFLUEGASCONTAININGASHINCREASEDTHISWILLMAKEESPMORETHANDEALINGWITHTHEDESIGNOFFLUEGASDUSTCONCENTRATIONVALUES,COLLECTIONEFFICIENCYWILLBESERIOUSLYAFFECTEDINORDERTOELIMINATECOALFROMTHEIMPACTOFCHANGESINCOLLECTIONEFFICIENCYOFELECTROSTATICPRECIPITATOR,DUSTREMOVALEQUIPMENTINTHESYSTEMUNDERNORMALCIRCUMSTANCES,EACHELECTROSTATICPRECIPITATORSHOULDBECARRIEDOUTATLEASTONEOFTHECHARACTERISTICSOFTYPICALCOALTESTSTODETERMINETHECOAL,ELECTRICITY,VIBRATIONEFFICIENCYELECTROSTATICPRECIPITATORFORTHECOMBINEDEFFECTOFTHEESPTOFINDTHEBESTOPERATINGMODE2STRENGTHENTHEELECTROSTATICPRECIPITATORMAINTENANCEANDREPAIRWORK1STATEPOWERENVIRONMENTALPROTECTIONPRODUCEDBYDJSERIESOFCOMPUTERCONTROLLEDHIGHLOWVOLTAGEPOWERSUPPLYDEVICES,ANDITSUSEOFADVANCEDHIGHPRESSURECONTROLPARTOFTHE8098SINGLECHIPANDPERIPHERALCHIPS,CONTROL,PROTECTIONFUNCTIONS,SIMPLESTRUCTURE,EASYTOUSEFEATURES,ANDFORTHERMALPOWERPLANTBOILERCOMBUSTIONEMISSIONOFDUSTFLYASHTHANTHECHANGESINRESISTANCEPROVIDESAWIDERANGEOFPOWERSUPPLYTORUNAVARIETYOFDIFFERENTWAYSTOMEETTHEREQUIREMENTSOFWORKINGCONDITIONSTHISPOWERSUPPLYEQUIPMENTFORTHEORIGINALTRANSFORMATION,THECENTRALPLANECANBEACHIEVEDWITHLONGRANGEANDTURBIDITYDUSTDETECTORCONSTITUTETHEFEEDBACKSIGNALOFTHECLOSEDLOOPCONTROLELECTROSTATICPRECIPITATOR,TOTHEEFFECTOFENERGYEFFICIENTOPERATIONTHEIRPROTECTIONANDALARMFUNCTIONSINVOLVEDINTHEIMPORTATIONOFOVERCURRENT,OUTPUTOPENCIRCUIT,OUTPUTSHORTCIRCUIT,UNDERVOLTAGEPROTECTION,PARTIALEXCITATION,SCRRISKOFOPENANDCRITICALTEMPERATURE,THETHERMALPOWERPLANTISALMOSTCOVEREDBYTHEOPERATIONOFELECTROSTATICPRECIPITATORFORALLFAULTTYPES2EFFORTSTOIMPROVETHESTATUSOFTHEOPERATIONOFELECTROSTATICPRECIPITATOR,STRICTLYENFORCETHEELECTROSTATICPRECIPITATOROPERATIONANDMAINTENANCEGUIDELINES,THEEXISTENCEOFTHEOPERATIONOFTHEEQUIPMENTFAILURESANDSHORTCOMINGSSHOULDBEINTIME,ESTABLISHACOMPREHENSIVE,REASONABLEMAINTENANCEANDPROJECTCYCLE3MAINTENANCEAREAOVERHAULATTHEELECTROSTATICPRECIPITATORINOVERCAST,ANODESPACINGADJUSTMENTS,ANDRECORDTHEMEASUREMENTRESULTSBEFOREANDAFTERADJUSTMENTTOOVERCAST,ANODEDEVICEVIBRATIONEQUIPMENTMAINLYELECTRICALVIBRATION,REDUCINGTHEBROWSERMACHINE,SHAFT,BEARINGS,TORSIONARMHAMMER,INSULATIONCONNECTINGROD,ETCTOINSPECTTHEWEARANDHANDLING;OFASHSYSTEMS,INSULATION,HEATINGSYSTEMS,DOOGRAYLEVELMETER,DEVICESSUCHASLOCKINGGASINSPECTIONANDDEBUGGING4ELECTRICALCONNECTIONENFORCINGOVERHAULOFPREVENTIVETESTSELECTRICALEQUIPMENTORDERINTHEELECTROSTATICPRECIPITATORTRANSFORMERRECTIFIERSECTIONSOFHIGHPRESSUREANDLOWPRESSUREREACTOR,INSULATINGSUPPORTANDCONNECTEDCOMPONENTS,HIGHVOLTAGEDIRECTCURRENTCABLESANDOTHEREQUIPMENTOFTHEPILOTPROJECTANDTHEEXPRESSPROVISIONOFTHECYCLE,TOTRIGGERPOWERSUPPLYDEVICEPERFORMANCETESTING,ONAVARIETYOFPROTECTIONTHROUGHOUTTHETRIAL,THEHIGHLOWVOLTAGEELECTRICALCIRCUITANDSWITCHINSTRUMENTSSEIZEDTHESCHOOL,ANDHANGINGRECTIFIERTOCHANGETHECOREINSPECTION5ESPOVERALLDEBUGGINGAFTEROVERHAULAFTERTHEOVERHAULOFTHERECTIFIERTRANSFORMERS,ELECTRICFIELDTONOLOADSTEPUPTEST,ANDRUNTIMECONDITIONSTOTHERATEDCHARACTERISTICSOFTHEUITESTING;OFIMPORTSANDEXPORTSOFFLUEGASTEMPERATUREANDPRESSURETESTINGINSTRUCTIONS;OFTURBIDIMETER,LIGHTINGEQUIPMENTFORTESTINGIFTHECONDITIONALWORDS,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11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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