The problem of large area damage was analyzed when cleaning and dismantling gas-gas heater(GGH) corrugated plate in a factory. The causes of corrugated plate damage were mainly studied from the field soot and operating conditions. The results show that high pressure steam is not suitable for direct soot blowing

and the safe soot blowing method is decompressing high pressure steam into low pressure steam before soot blowing. High pressure steam with pressure higher than 0.8 MPa

and enthalpy value more than 2 978.4 kJ/kg can be used as the corrugated plate soot source. Research findings would play a positive role in maintaining the life of the corrugated plate and provide reference for safe blowing of air preheater and GGH.