Corrosion failure and protection of high temperature heating surface of waste incinerator
In the face of the increasingly prominent garbage disposal problems including a wide variety of garbage,large treatment capacity and high moisture,waste incineration has become the preferred solution.The working fluid parame-ters of garbage incinerators have been continuously improved,and the corrosion failure of high-temperature heating sur-face has become one of the important factors affecting the safe operation of garbage incinerators.By revealing the fail-ure mechanism of the high-temperature heating surface of the garbage incinerator to guide the material selection and maintenance.Firstly,the corrosion types and mechanisms dominated by the heating surface of the garbage incinerator are described,in which the high-temperature heating surface is severely corroded by chloride and sulfate.Secondly,ac-cording to the corrosion characteristics of chlorine and sulfur,the corresponding corrosion behavior model was estab-lished,during which chlorine and iron in iron-chromium alloy formed low-melting point and volatile ferrous chloride,and sulfur formed sulfate and sulfide-type products on the high-temperature heating surface,resulting in the thinning of metal pipes.Thirdly,the thermodynamic stability theory was used to analyze the formation and stability of the corrosion prod-ucts of the high-temperature heating surface of the garbage incinerator,and it was found that with the increase of tem-perature,the oxides in the sulfate corrosion model would be replaced by the sulfides of iron and chromium.With the in-crease of the partial pressure of chlorine in the atmosphere,the sulfides of chromium would be transformed first,and then the sulfides of iron would be transformed.Finally,the technical characteristics and protection principles of high-tem-perature heating surface engineering such as thermal spraying,surfacing welding and laser cladding were discussed.
waste incineratorheat exchangeshigh temperature corrosionsalt corrosion
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