1000MW火电机组水泵节能策略 电气工程专业

1000MW火电机组水泵节能策略Energysavingstrategyfor1000MWthermalpowerunitpumps摘要随着江苏外来电量的大幅增加、新能源发电的占比提高，火电机组的实际负荷能力明显降低，火电机组年运行小时数逐年稳步下降，火电机组厂用设备耗电量也有所升高。那么，火力发电厂如何降低厂房设备的能耗，提高厂房的能源利用率，进而降低机组煤耗，以减少成本，提高电能上网竞价优势，便成了现在火电行业亟需解决的课题。火力发电厂的厂用电主要来自汽机、锅炉等系统中大型的风机、水泵等辅机设备的电机。本文对机组的节能现状进行分|析，针对机组电耗较高的水泵开展节能降耗分析，主要体现在凝结水泵以及循环水泵两个方面。研究循环水泵高、低速两者变化运行的可能性，这种方案实现了循环水泵的高、低速变化。再根据循环水泵高、低速运行情况采取可行的优化运行措施，通过计算与试验制定合理的循环水泵运行方式，力争达到最优的运行方式，使其能够节省更多的能量。从能量消耗方面分析凝结水系统，从而可以进一步分析凝结水泵变频的改造，与此同时也可以进行除氧器水位调节性能的优化，尽量保持除氧器上水调阀在全开状态。改造后提高了凝结水泵所具有的泵的启动特性，降低了控制阀的磨损几率，使设备更加可靠，使|用时间更长，使得凝结水泵的能耗和系统节流损失都大大的降低，最终达到设备能耗进一步减少的目的。本文通过对火电机组水泵主要设备节能降耗工作的开展，挖掘了机组的节能潜力，产生了较好的经济效益，有效提升机组的竞争力。该论文共有图17幅，表22个，参考文献67篇。。关键词：火电发电；节能降耗；厂用电；循环水泵；凝结水泵17

1AbstractDuetothelargeincreaseofexternalelectricityandtheincreaseoftheproportionofnewenergypowergenerationinJia|ngsuProvince,theloadrateofthermalpowergenerationunitshasdecreasedsignificantly,theannualoperationhoursofunitshavecontinuedtodecrease,andtheauxiliarypowerconsumptionrateofthermalpowerunitshasalsoincreasedcorrespondingly.Therefore,Howtoreducetheenergyconsumptionofplanteq|uipmentandimprovetheenergyutilizationrateofthermalpowerplant,andthenreducethecoalconsumptionofunits,soastoreducethecostandimprovethecompetitiveadvantageofelectricenergyonline,hasbecomeanurgentissueforthethermalpowerindustry.Theauxiliarypowerofthermalpowerplantismainlyd|uetothelargefan,waterpumpandotherauxiliaryequipmentinsteamturbine,boilerandothersystems.Thispaperanalyzesthecurrentsituationofenergysavingoftheunit,andfindsthatthepumpwithhighpowerconsumptionoftheunitcarriesouttheanalysisofenergysavingandconsumptionreduction,mainlyincl|udingcirculatingwaterpumpandcondensatepump.Thispaperanalyzeswhythehighandlowspeedtransformationofthecirculatingwaterpumpisfeasible,totransformthehighandlowspeedofthecirculatingwaterpump.Throughcalculationsandexperiments,areasonableoperationmodeofthecirculatingwaterpump|isformulated,andtheoperationsituationafterthetransformationisstrivingtoachievetheoptimaloperationmodeandrealizetheidealenergy-savingeffect.Thispaperalsoanalyzestheenergyconsumptionofcondensatesystem,and17

2analyzesthefrequencyconversiontransformationofcondensatepump.Th|ecombinationofcondensatepumpfrequencyconversiontransformationanddeaeratorwaterlevelcontrolmodeoptimizationimprovesthestart-upcharacteristicsofcondensatepump,reducesthewearofcontrolvalve,andimprovesthereliabilityandservicelifeoftheequipment;atthesametime,italsogreatlyre|ducesthepowerconsumptionofcondensatepumpoperationandthethrottlinglossofdeaerato