垃圾电站锅炉腐蚀速度及关键影响因素研究进展

Research Progress on Corrosion Behavior and Key Influencing Factors for Structural Materials of Waste Power Plant Boiler

针对垃圾电站锅炉受热面日益严重的腐蚀问题,以经典的腐蚀曲线为对象,对垃圾炉四管受热面的腐蚀速率规律做了分析和归纳,并对在全温域内随管道壁温变化的腐蚀机理进行了综述。提炼出腐蚀速度曲线具有双峰、突变、虚实等三个显著特征。根据从低到高的壁温变化,对腐蚀速率按照电化学腐蚀和高温腐蚀两部分分别进行了评述并分段解构,根据不同壁温度区间腐蚀规律和机理进行了系统论述。探讨了烟温对腐蚀速率的影响,最后对腐蚀速率曲线的时效性进行了进一步的探讨。

In view of the increasingly serious corrosion problem of the heating surface of structural materials for waste power plant boilers,the corrosion regulation of the four kinds of tubes,related with the water wall,superheater,reheater and economizer for waste power plant boilers,were analyzed and summarized by taking the classical corrosion rate curves as reference,and the corrosion mechanism varying with the pipe wall temperature in the whole operation temperature range is also summarized.It is concluded that the corrosion rate curve has three remarkable characteristics:bimodal,abrupt change,and virtual-reality.According to the change of wall temperature from low to high,the corrosion rate can be interpreted in terms of electrochemical corrosion and high temperature corrosion respectively.Meanwhile,the corrosion features and the relevant mechanism are discussed by taking the variation of wall temperature range into account.The effect of flue gas temperature on the corrosion rate is discussed,and several key factors affecting the corrosion rate,such as fluid medium temperature,ash accumulation,oxide scale and temperature gradient are analyzed,and the timeliness of corrosion rate curves is discussed in detail.