660 MW燃煤锅炉水冷壁局部高温腐蚀原因分析及优化调整.pdf
2024年第8期运行与维护电力系统装备
2024No.8OperationAndMaintenanceElectricPowerSystemEquipment
660 MW燃煤锅炉水冷壁局部高温腐蚀原因分析及优化调整
郑东升
(晋控电力同华山西发电有限公司,山西忻州034114)
[摘要]为了解决某电厂锅炉水冷壁出现的局部高温腐蚀问题,文章对煤质、腐蚀形态及腐蚀产物进行了分
析,研究了导致这种腐蚀的原因。利用热膨胀法测量了不同工况下水冷壁温度分布情况,并对其进行了温度场计算。
研究结果表明,导致高温腐蚀的主要因素是机组实际使用的燃煤中硫的含量超过了预期设计,燃烧器的设计缺陷
使得炉内存在强烈的还原性气氛,加上定期进行的大量出力试验,导致大量的煤粉在水冷壁鳍片附近聚集并粘连。
另外,燃烧器结构存在问题也是造成该炉高温腐蚀的重要原因之一。因此,调整煤粉的粒度,对燃烧器进行改进,
并对燃烧过程进行优化调整,可以解决高温腐蚀的问题。
[关键词]水冷壁;高温腐蚀;原因分析
[中图分类号]TM621.2[文献标志码]A[文章编号]1001–523X(2024)08–0150–03
AnalysisandOptimizationofLocalHighTemperatureCorrosionin
WaterWallof660MWCoal-firedBoiler
ZHENGDongsheng
Abstract
[]afactoryboilerwaterwallappearedhightemperaturecorrosion,throughtheanalysisofcoalquality,
corrosionobservationandcorrosionproducts,westudiedthecausesofthecorrosion,usingthethermalexpansionmethod
measuredthewaterwalltemperaturedistributionunderdifferentconditions,andthetemperaturefieldcalculation.The
researchresultsrevealthatthemainfactorleadingtohightemperaturecorrosionisthatthesulfurcontentinthecoal
actuallyusedintheunitexceedsthedesignexpectation,thedesigndefectoftheburnermakesastrongreducingatmosphere
inthefurnace,andalargenumberofregularoutputtests,leadingtotheaggregationandadhesionofalargenumberofcoal
pulverizedcoalnearthewatercoolingwallfins.Inaddition,thestructureoftheburnerisalsooneoftheimportantreasons
forthehightemperaturecorrosionofthefurnace.Therefore,wesuggesttoadjusttheparticlesizeofpulverizedcoal,
partiallyimprovetheburner,andoptimizethecombustionprocess.