高温管屏在线监测系统在防止锅炉高温管屏结渣中的应用

Application of the PASS system in preventing slagging in high temperature heating surface of boilers

分析导致过热器和再热器管屏结渣的影响因素,指出减小各屏吸热偏差是防止高温管屏结焦的关键,促进烟气沿锅炉宽度方向的温度和速度均匀分布是消除过热器和再热器热偏差的有效途径。利用高温管屏安全性在线监测系统(PSSS)对华能海门电厂一期超超临界1 036MW机组锅炉高温再热器温度场变化和管屏结渣情况进行监测,通过实施优化炉内燃烧动力场,防止燃烧火焰冲墙、贴壁,有效控制炉膛周围还原性气体产生,降低烟气温度,同时有针对性地实行吹灰等措施后,消除了高温再热器积灰和结焦。

The factors affecting the slagging on tubes of superheaters and reheaters were analyzed.Reducing the heat absorption deviation between each panel was pointed out as the key points to prevent slagging.Improving the uniformity of temperature and speed of flue gas in boiler width direction was the effective way to eliminate the heat deviation of superheaters and reheaters.The high temperature panel safeguard supervisory system(PSSS)was applied to investigate the temperature field variation and slagging on tube panel of superheater and reheater in boiler of ultra supercritical 1036MW unit in Huaneng Haimen Power Plant phase I.After several measures were taken,such as optimizing the aerodynamic field in furnace,preventing the flame swepting and adhereing the water wall,effectively controlling the formation of reducing gas in furnace,decreasing the flue gas temperature,and conducting soot blowing,the ash deposition and slagging on high temperature reheater was eliminated.