Study on damage risk assessment methods of power plant boiler tubes

LI Zheng-gang1， SHI Duan-wei1， LIAO Dong-mei1， LI Mao-dong2
（1. School of Power and Mechanical Engineering， Wuhan University， Wuhan 430072， China；
2. Guangzhou Special Pressure Equipment Inspection and Research Institute， Guangzhou 510100， China）

Abstract： Aiming at the problems of the current inspection standards of the power plant boiler tubes were only qualitative evaluation and a single approach，the basic principles of safety science-based risk assessment and risk - based inspection technology were applied，the damage risk assessment methods and processes for the power plant boiler tubes were proposed and discussed. According to the principles that the risk assessment results should be consistent with the current standard evaluation results，the scale of inspection indicators during the inspection process of the power plant boiler heating surface were divided，the probability and consequences scale of the risk matrix assessment and the quantitative span of the severity of the consequence were studied and determined. The results indicate that the inspection risk matrix assessment methods of the power plant boiler tubes is effective. On this basis，it can be to implement the risk assessment of the damage of the power plant boiler tubes，to reflect the risk level of the damage of the boiler heating surface scientifically and to develop different precontrol measurements，the prevention and treatment will be carried out in a planned，targeted，economical and reasonable way，so that it can be to provide the basis of maintenance decision according to the equipment status of the power plant.
Key words： power plant boiler； boiler tube； damage； risk assessment