超临界锅炉水冷壁高温腐蚀分析及对策.pdfVIP

超临界锅炉水冷壁高温腐蚀分析及对策 钟万里, 吴奭登, 曾凡云 广东电力科学研究院, 广东 广州 5 10600 [ ] 某超临界直流锅炉运行4 个月后小修时发现, 燃烧器 近区域水冷壁左右侧墙中部水 冷壁管的向火侧外壁存在高温腐蚀现象分析认为, 产生高温腐蚀的主要原因为燃煤 含硫量较高管壁温度高及双调风旋流燃烧器前后墙对冲布置等为此, 提出了合理配 风对冲刷区域喷涂控制煤粉细度避免受热面局部过热等措施 [ ] 超临界机组; 直流锅炉; 对冲燃烧; 水冷壁; 高温腐蚀 [ ] T K224 . 9+ 4 [ ] B [ ] 100223364 ( 2009) 1220106203 [DOI ] 10 . 3969/ j . issn . 100223364. 2009 . 12. 106 CAUSE ANALYSIS OF HIGH TEMPERATURE CORROSION ON WATER WALL OF SUPERCRITICAL ONCE2THROUGH BOILERS AND COUNTERMEASURES THEREOF ZH ONG Wan2 i, WU Shi2 deng , ZENG Fan2yun Guangdong E ect ric Power Scien ce R esear ch In st it ut e, Guangzhou 510600, Gu angdong Province, PR C Abstract :T he high t emperature corr osion ph en om in on h ad discov ered in t emporary rep air aft er four mont h s in op erat ion of on e supercritica on ce2t hrou gh b oi er , t he said corrosion occurred on t h e fire2 side of wat er2wa t ub es, wh ich sit u at ed on th e cent re of eft an d right side wa s n ear t he r egion of bur ners. It is b e ieved from ana y sis t h at th e main cau ses eadin g t o high temp erature corrosion are: h igh su ph er cont ent in th e fue coa , h igh temp erature on t he wa of t ub es , an d opposed ar rangem ent of doub e air2t uned cyc on e bur ners on t h e front and rear wa s , et c. . F or t h ese, some counterm easures, such as reasonab e air dist ribut ion, coat ing spr ay ed ont o t he er osion region, cont ro ing t h e fineness of pu verised coa , avoidin