Cracking Analysis of Middle Pressure Steam Superheater Shell in Coal Chemical Shift Unit
The shell of the middle pressure steam superheater of the coal chemical shift device was tested,and a branch-like transverse penetrating crack with a length of 110 mm was found.Through the outer wall ultrasonic phased array detection,magnetic particle detection,hardness measurement,chemical composition analysis,metallographic structure analysis and other detection methods to analyze the causes of cracks.It is determined that the thermal stress concentration and alkali stress corrosion caused by local concentration of lye are the main causes of cracks.Put forward targeted structural design and daily operation suggestions,and the results provide reference for the operation of similar and same process equipment.
NETL
NSTL
万方数据
