The oxide scale problem occurred on superheater has seriously affected the safe and economic operation of thermal power units.This paper analyzes the causes of oxide scale on the superheater surfaces

and compares the technical performance

economy

advantages and disadvantages of the commonly used treatment methods for oxide scale in China.The chemical cleaning method and material upgrading and replacement method were applied to treat oxides problems for a subcritical 600 MW unit and supercritical660 MW unit

respectively.The results show that

the temperature deviation between the main steam and superheater tube wall of the above two units are normal after oxide scale treatment

no oxide scale exfoliation has been found by now

indicating the economic benefits are notable.