摘要
在模拟烟气的条件下,于管式炉中采用腐蚀增重法研究了低参数循环流化床(CFB)锅炉过热器常用材料20G在不同盐酸浓度(0.1%～0.2%)及温度(500～600℃)下的腐蚀特性,并进行动力学分析。结果表明:随着反应温度和HCl浓度的增加,20G耐腐蚀性能总体上降低;在金属表面形成的腐蚀膜呈分层结构,Cl元素由内向外含量降低,外层主要成分为Fe2O3,含有少量的Fe3O4;HCl浓度0.1%、500℃时的腐蚀产物为针状,温度越高针状结构越大。因此,在温度高于600℃、HCl浓度大于0.2%时,20G不适用于抗蚀材料。
The corrosion weight method was adopted to investigate the corrosion characteristics of G20,the common material for superheaters in low parameter CFB boilers in tube furnace under simulated flue gas condition,with different HCl concentrations(from 0.1%to 0.2%)and temperatures(from 500℃to 600℃).Metal specimens after corrosion tests were analyzed by SEMEDS and XRD to detect the appearance and composition of corrosion products.Moreover,kinetic analysis was also conducted.The results showed that,with an increase in the reaction temperature and HCl concentration,the anti-corrosion performance of 20Gdecreased generally.The corrosion film on metal surface showed a layered structure;the content of Cl decreased from inside to outside,and the outside layer mainly consisted of Fe2O3and a small amount of Fe3O4.The corrosion products took on a needle-like structure at 0.1% HCl concentration and this shape became bigger when the temperature increased.Therefore,at temperature of 600℃,and with the HCl concentration larger than 0.2%,20Gis not suitable for erosion resistant.
出处
《热力发电》
CAS
北大核心
2013年第8期119-123,127,共6页
Thermal Power Generation
关键词
CFB锅炉
废塑料
20G
盐酸
高温腐蚀
CFB
waste plastic
20G
hydrochloric acid
high temperature corrosion
