Tube Failures in Conventional Fossil Fired Boilers and in Combined Cycle/HRSGs

摘要

Boiler tube failures(BTFs)in conventional fossil plants can be beaten by a comprehensive management-supported Boiler Tube Failure Reduction Program/Cycle Chemistry Improvement Program.Case study results are included to illustrate the superb results that have emanated from six organizations.HRSG tube failures(HTFs)are also the leading cause of availability loss in combined cycle units.The primary failure mechanisms are thermal-and creep-fatigue,and flow-accelerated corrosion(FAC).In the HRSG there is an opportunity to avoid these HTFs by incorporating the known avoidance factors in the design,and by conducting thermal and chemical monitoring early in the life of the HRSG.For both BTF and HTF,the optimum approaches to alleviation are included.