Utilization of Friction Tubes to Control Velocity and Erosion in Main Steam Drain Systems

摘要

Duke Energy has experienced significant erosion in main steam drain systems at many of its coalfired power plants. This erosion constitutes a safety and reliability issue. Over the years, severalapproaches have been taken to deal with this issue. This paper provides an overview of mainsteam drain system erosion and provides details associated with the recent use of friction tubes tominimize erosion. The following specifics will be covered: An overview of Duke’s experience with this issue Causes of drain system erosion Options for remediation including discussion of modifications implemented at severalDuke stations Details of a recent modification at Marshall unit 3 which utilized friction tubes to control velocity and erosion