摘要
超超临界参数下水分子本身具有很强的氧化性,能使锅炉水冷壁管形成致密坚固的垢。以某电厂2×600 MW超超临界机组化学清洗为例,根据锅炉垢样特性,选用了3种复合有机酸,进行静态、动态酸洗模拟试验,测定了不同配方下水冷壁的腐蚀速率,并按动态试验的结果确定了酸洗方案。最终选定了由2%羟基乙酸与0.5%氟化钠组成并添加缓蚀剂的复合有机酸进行化学清洗,腐蚀速率及腐蚀量皆符合标准,清洗效果良好。
Water molecules under ultra-supereritieal conditions have strong oxidizing nature, which makes boiler water wall tubes form dense scale. Based on the anahsis of tile scale composilion for the two 600-MW ultra-supereritical units at one power plant, the slatie and ,dynamic simulation tests are conducted with lhree sorls of organic acids. And the corrosion rate and corrosion quantity of the metal piece are delermined respectively. Following the dynamic simulation test result, 2% glycolic acid and 0.5% sodium fluoride with a certain alnounl of inhibitor is chosen as the cleaning agent for the two units. After cleaning, both the corrosion rate and corrosion quantity meet the related standard, which indicates thai the cleaning effect is salisfactory.
出处
《中国电力》
CSCD
北大核心
2013年第1期46-49,53,共5页
Electric Power
关键词
超超临界机组
锅炉
化学清洗
复合有机酸
ultra-supercritical unt
boiler
chemical cleaming
coniposile organic acid
