CAJ | 학술논문

陕西某电厂135MW循环流化床锅炉屏式再热器管(材质为SA-213TP304H)浇注料内部水平管段发生爆管泄漏,停炉后检查,发现爆口管段没有明显减薄、磨损、胀粗、过热及氧化现象,附近众多管子表面存在环向裂纹,后送陕西电力科学研究院对失效管样进行化学成分、微观金相分析及力学性能测试.结果表明:该类屏式再热器裂纹开裂起源于外壁,沿晶界向内壁扩展,开裂附近存在众多沿晶裂纹,沿晶裂纹相连,逐步吞噬晶粒,直至穿透泄漏,确定屏式再热器管失效的主要型式为晶间腐蚀开裂,浇筑料内管段损伤比光管部分严重.为增强管材的抗晶间腐蚀能力,后将屏式再热器材质升级为SA-213TP347H管材,至今未发生晶间腐蚀开裂泄漏现象.
협서모전엄135MW순배류화상과로병식재열기관(재질위SA-213TP304H)요주료내부수평관단발생폭관설루,정로후검사,발현폭구관단몰유명현감박、마손、창조、과열급양화현상,부근음다관자표면존재배향렬문,후송협서전력과학연구원대실효관양진행화학성분、미관금상분석급역학성능측시.결과표명:해류병식재열기렬문개렬기원우외벽,연정계향내벽확전,개렬부근존재음다연정렬문,연정렬문상련,축보탄서정립,직지천투설루,학정병식재열기관실효적주요형식위정간부식개렬,요축료내관단손상비광관부분엄중.위증강관재적항정간부식능력,후장병식재열기재질승급위SA-213TP347H관재,지금미발생정간부식개렬설루현상.
A power plant in Shaanxi circulating fluidized bed boiler platen reheater (MaterialSA-213TP304H),the inside pouring pipes crack but we don't find any reduction,abrasion,dilatancy,overheat and combus-tion,some nearby pipes face have crack,then we send them to electricity science institute to analyze the chemical component,microstructure,mechanical properties test for invalid pipes.The result shows that plat-en reheater crack is because the outside grain boundary expands to inside,some grain boundary conjoint crack in the crack place,covers crystal particle and makes it crack.The reason is that platen reheater is in-valid for grain boundary crack,pouring material pipe destroyed seriously than light pipe.To strengthen inter-granular corrosion resistance of pipe materials,we change platen reheater into SA-213TP347H pipe materi-als,haven't found crack and leakage.