火电厂脱硝SNCR尿素溶液对锅炉水冷壁管腐蚀分析及防止措施.pdf

176现代制造技术与装备2024年第12期总第337期

火电厂脱硝SNCR尿素溶液对锅炉水冷壁管腐蚀

分析及防止措施

饶秀平张提安明辉发郑亿谢国江李凯田勇何成玉

（国家电投集团贵州金元股份有限公司纳雍发电总厂，毕节553303）

摘要：分析纳雍电厂一厂在选择性非催化还原（SelectiveNon-CatalyticReduction，SNCR）脱硝过程中，尿

素溶液对锅炉水冷壁腐蚀的机理，包括酸性HCNO生成、NH3与铬的络合反应等。总结了水冷壁异常的5种主

要原因，并提出了6项应对措施，包括升级喷枪结构、加装防护装置、优化系统逻辑及联锁、提高运行管理水平、提

高运检水平等，旨在减少尿素溶液对水冷壁的腐蚀，规避泄漏风险，保障电力生产安全。强调解决锅炉“四管”

泄漏问题需找出根本原因，采取针对性预防措施和技术攻关。

关键词：脱硝；选择性非催化还原（SNCR）尿素喷枪；水冷壁；腐蚀

AnalysisandPreventiveMeasuresofCorrosionofBoilerWaterWallTubesbySNCRUrea

SolutionforDenitrificationinThermalPowerPlants

’

RAOXiuping,ZHANGTian,MINGHuifa,ZHENGYi,XIEGuojiang,LIKai,TIANYong,HEChengyu

(SPICGuizhouJinyuanCo.,Ltd.,NayongGeneralPowerPlant,Bijie553303)

Abstract:ThisarticleanalyzesthemechanismofcorrosionofboilerwaterwalltubesbyureasolutionduringSelectiveNon-

CatalyticReduction(SNCR)denitrificationprocessinNayongPowerPlantNo.1,includingthegenerationofacidicHCNOandthe

complexationreactionbetweenNH3andchromium.Fivemainreasonsforabnormalwaterwalltubesweresummarized,andsix

countermeasureswereproposed,includingupgradingthespraygunstructure,installingprotectivedevices,optimizingsystemlogicand

interlocking,improvingoperationalmanagementlevel,andenhancingoperationalinspectionlevel.Theaimistoreducethecorrosionof

ureasolutiononwaterwalltubes,preventleakagerisks,andensurethesafetyofpowerproduction.Emphasizingtheneedtoidentifythe

rootcauseofboiler“fourtube”leakageproblems,taketargetedpreventivemeasuresandtechnologicalbreakthroughs.

Keywords:denitration;SelectiveNon-CatalyticRed