【摘要】 以对冲燃烧方式的电站锅炉水冷壁壁面高温腐蚀问题为研究对象,从腐蚀机理与燃烧特性角度对水冷壁燃烧区域进行腐蚀特性建模分析,研究水冷壁近壁区域还原性和腐蚀性气氛作用下的硫化物型熔盐腐蚀部位分布规律,腐蚀发生严重的区域将集中在两侧墙的燃烧器周围区域、下层冷灰斗区域、上层燃烧器与顶层燃尽风喷口之间的两侧墙中间区域。现场实测数据验证可知,燃煤电站锅炉水冷壁近壁区域在氧浓度极低情况下,H₂S、CO等物质浓度严重超出腐蚀判定指标要求,水冷壁壁面腐蚀严重,腐蚀发生部位与数值模型结果吻合。结合工程经验,给出了水冷壁壁面高温腐蚀防治的具体措施。更多还原

【Abstract】 The object of research is the high-temperature corrosion of the water-cooled wall of the utility boiler in the form of hedge combustion. The corrosion characteristics of the water-cooled wall combustion area are modeled and analyzed from the perspective of corrosion mechanism and combustion characteristics. The distribution of sulfide-type molten salt corrosion parts is distributed. The areas where severe corrosion occurs will be concentrated in the area around the burners on both sides of the wall, the area of the lower cold ash hopper, and the middle of the sides of the wall between the upper burner and the top burnout vent region. The verification of field measured data shows that when the oxygen concentration in the near wall of the water-cooled wall of a coal-fired power plant boiler is extremely low,the concentration of H₂S, CO and other substances exceeds the requirements of the corrosion judgment index.Combined with engineering experience, specific measures for high temperature corrosion prevention of water-cooled walls are given.更多还原