Development

200一MWunitfittedwithconventionalpulverizedcoal—fired

    ;boiler,tubemill,binstoragepulverizingsystem,motor—driven

    ;feedpumpandrecirculationcoolingtower,theservicepower ;rateoftheairandgassystemstoodat1.69%.

    ;Thereexistedageneralandbasicproblemthatoversize ;equipmentwerechosenfortheairandgassystem.Forunitsof ;200MWandbelow.centrifugalfausweremainlyusedas ;forced—draftfan,induced—draftfanandprimaryairfanfor

    ;theairandgassystem.Theairflowinoperationdepended ;basicallyondamperforregulation.Resistanceandairflow ;calculationwasrelativelycomplicated.Thereweremany ;powerplantswhosedesignoutputsoffansweregreaterthan ;required.Accordingtoanalysisonmeasureddataofapower ;plant’s200一MWunit.theoutputofitsinduced—draftfanwas

    ;greaterthanitisneeded.sothattheactualelectricitycon—

    ;sumptionwasbyfargreaterthanthedueone.Itsactualmotor ;loadexceeded3.55.2.89and2.5ltimesoftherequiredunder ;60%,80%and100%unitloadrespectively.Inotherwordsthe ;actuallyrequiredfanpowerwasonly39%oftheselectedone.

;MeasureddataofalO0一MWunitshowedthattheprimaryair

    ;fanloadwas81.5%and88.55%respectivelyunder60%and ;80%unitloadandconsumed35.9%andl0.7%moreofelectric ;energyunderlowload.

    ;1)Accordingtostatisticsofoperatingdataonthermal ;powerunitsin2004and2005,thecorrectedservicepower ;rateof563100—800一MWclassunitscountedwas6.187%

    ;in2004andthatof285300一MWandaboveunitswas5.124%

    ;in2005.Throughcomparisonandcalculation,theannual ;averageservicepowerrateofthermalpowerunitsnationwide ;was1.0%一1.5%higherthantheadvancedworldleve1.

    ;21Thegoalthattheannualaverageservicepowerrateis ;decreasedby0.1%canbeachievedbymeansofstrengthening ;productionmanagement,maintainingequipmentperfectness, ;payingattentiontosavingenergyduringpeakloadregulation, ;eliminatingoldmediumandsmallunits,commissioninglarge ;unitsandtechnicalrenovation.

    ;3)Highenergy—consumingsystemsandequipmentare

    ;mainlycoalpulverizing,airandfluegas,feedwaterandcircu—

    ;latingcoolingwatersystemsincludingmotor..drivenfeedwa.. ;terpump,circulatingpump,induced—draftfan,primaryair

    ;fan,forced—draftfan,coalpulverizerandcondensatepump.

;Stressshouldbeplacedontheoptimizationofthefoursys—

    ;temsandthesevenkindsofequipment.

    ;4)Whenthecoalheatingvaluehasavariationof2092kJ/kg, ;theservicepowerrateoftubemillandmedium—speedmill

    ;systemsvariesinarangeof-+0.2%and?0.1%respectively. ;Whenthehardgrovegnndabilityindexhasavariationof5,the ;averageservicepowerrateincreasesordecreasesby?0.1%. ;5)Largeequipmentshouldbefittedwithspeedregulation ;orfrequencymodulationratherthandampersorregulating ;valvesasfullyaspossible.Thisisaneffectivewaytocut ;downtheservicepowerrate.

    ;(TranslatedbyWangBenandeditedbyZhangYan) ;DevelopmentofpowerindustryinChongqing

    ;Thepolicyofreformandopeningtotheoutside

    ;worldhasbroughtaboutahistoricaIopportunityfor ;thepowerindustryofChongqingtodeveloprapidly. ;In1992.two360一MWunitsofHuanengLuohuang

    ;PowerPlantwentintooperation.In1995.thetotaI ;installedcapacityofChongqingPowerPlantcameup ;to800MWafterextended.In1996.Chongqing

    ;becameamunicipalitydirectlyundertheCentraI ;Government,whichcreatedanothergreatopportunity

    ;f0rfurtherdevelopmentofthepowerindustryin ;Chongqing.TiIItheyear,theinstalledcapacityof ;thewholecityreached2993.1MWandtheannuaI ;generationtotaled13-316TVvh.Theelectricitysoldof ;thenationaIgridwas11.382TVvh.Therewere299 ;substations(35—220kV)withanaggregatecapacityof ;6564.6MvAand35—50okVtransmissionlinesof

    ;9157.76kminlength.Bytheendof2005.theinstalled ;capacityandtheannuaIgenerationwere5645.4MW ;一兰0-ELECTRICITY2006.N0.4

    ;and25.112TWhrespectively.Theelectricitysoldof ;thenationalgridamountedto28.934TWh.There ;were458substations(35--500kV)withanaggregateca-- ;pacityof24,693.7MVAand35—500kVtransmission

    ;linesof14.932.14kminlength.

    ;Asmoreandmorepowersourcesenterandthe ;cityexpands,thesupplycapacityofthepowergrid ;cannotmeettheneedsofthesociaIandeconomic ;development.ChongqingPowerCompanyseizesthe ;opportunityofthevastdevelopmentofwesternChina ;andtheconstructioninThreeGorgesreservoirarea. ;TakingtheconstructionofuItra-highvoltagegridasa

    ;turningpointandtheconstructionof500-kVtrunk ;frameasakeypoint,thecompanywillbuildupa ;strong500-kVpowergridconnectingwestwardwith ;SichuanPowerGridandeastwardwithCentraIC’hina

    ;PowerGridby2010.

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