摘要
通过对某台锅炉低温再热器爆管管壁的宏观检验、显微组织和能谱分析表明,低温再热器爆管的原因与停炉保护不当导致的氧腐蚀造成管壁严重减薄有关。对此,提出了在停机4～12h前停止加氧,并增大凝结水精处理后的加氨量,使给水pH值提高到9.1～9.2。另外,优化锅炉热炉放水余热烘干,也可有效减少氧腐蚀对设备的损害。
Through macroscopic inspection as well as microstructure and energy spectrum analysis for the tube-wall of bursted tubes on low-temperature reheater of a boiler in one power plant,it shows that the causes leading to tube-burst on low-temperature rehater is related to the serious tube-wall thickness reduction resulted from oxygen corrosion due to unsuitable boiler shutdown conservation.For this,the oxygen addition has to be stopped before 4~12 hours of the unit shutdown,and enlarging the ammonia injection after polishing treatment of the condensate,making the pH value of feed-water to be enhanced to 9.1~9.4,moreover,the boiler has to be dried out by using the residual heat of blow-off water from the hot furnace,so as to effectively reduce the demage of oxygen corrosion onto the equipments.
出处
《热力发电》
CAS
北大核心
2011年第10期88-91,共4页
Thermal Power Generation
关键词
锅炉
低温再热器
管壁
氧腐蚀
爆管
boiler
low-temperature reheater
tube-wall
oxygen corrosion
tube-burst
