水冷壁高温腐蚀原因分析.pdf

工業加熟

2024年第53卷第3期

Vol.53No.32024INDUSTRIALHEATING

D0I:10.3969/j.issn.1002-1639.2024.03.003

水冷壁高温腐蚀原因分析

何晓梅，王悦悦，王波，杨宇卓，梁灯灯

（西安建筑科技大学冶金工程学院,陕西西安710055）

摘要：通过宏观分析、显微组织观察、扫描电镜与能谱成分分析和X射线衍射分析，对某电厂水冷壁向火侧进行高温腐蚀原因分析。

结果表明：由于该锅炉采用四角切圆燃烧方式导致水冷壁局部高温；复合空气分级低NO，燃烧系统导致部分燃烧器区域处于贫氧还

原性气氛，使烟气中CO+H,S浓度过高；锅炉入炉煤硫份超过设计值较多,形成高浓度的H,S和SO2;水冷壁向火侧腐蚀以硫腐蚀为

主。针对该锅炉水冷壁高温腐蚀问题，给出以下建议：控制入炉煤硫份，降低煤中的硫元素含量，减少H,S和SO,浓度；燃烧优化调

整，采用侧边风技术，向炉膛内通入空气，降低水冷壁高温腐蚀区域的还原性气浓度,增加局部含氧量；在高温腐蚀严重的区域，对

其水冷壁管进行防高温腐蚀喷涂处理,以增强其抗高温腐蚀性能。

关键词：锅炉；水冷壁；高温腐蚀

中图分类号：TK224.9文献标志码：A文章编号：1002-1639(2024)03-0011-03

CausesAnalysisofHigh-temperatureCorrosionofStationBoilerWaterWalls

HEXiaomei,WANGYueyue,WANGBo,YANGYuzhuo,LIANGDengdeng

(SchoolofMetallurgicalEngineering,XianUniversityofArchitectureTechnology,Xian710055,China)

Abstract:Thecausesofhightemperaturecorrosionofwaterwallwasinvestigatedbymeansofmacroanalysis,microstructureobservation,

scanningelectronmicroscopy,energyspectrumcompositionanalysis,andX-ray.Resultsshowedthatduetotheuseoftangentialfiringatfour

cornersintheboiler,localhightemperaturesinthewater-cooledwallwereobserved;thecompositeairclassificationlowNO,combustionsys-

temcausessomeburnerareastobeinareducingatmospherewithlowoxygenconcentration,resultinginexcessivelyhighCO+H,Sconcentra-

tioninthefluegas;thesulfurcontentofthecoalfedintotheboilerexceedsthedesignvaluesignificantly,resultingintheformationofhigh

concentrationsofH,SandSO2;thecorrosionofthewater-cooledwalltowardsthefiresideismainlycausedbysulfurcorrosion.Insummary,

thefllowingsuggestionsaregiven:thesulfurcontentoftheincomingcoaliscontrolledtoreducethesulfurele