System and Method for Online Monitoring of Corrosion of Gas Turbine Components

摘要

A system and method capable of performing online corrosion monitoring of a component (12,32) installed in a gas turbine. A sensing device (14,34) is located so that electrodes (20,40) thereof are exposed to an operating environment within the gas turbine section (10) containing the component (12,32). The electrodes (20,40) are formed of a material so that the component (12,32) and electrodes (20,40) similarly respond to corrosive agents within the gas turbine section (10). The electrodes (20,40) are electrically insulated from each other and each electrode (20,40) is operable as an anodic electrode (20,40) or a cathodic electrode, depending on the extent of corrosion thereat, so that each electrode (20,40) has an electrical potential value, voltages exist across the electrodes (20,40), electric currents flow between the electrodes (20,40), and the electrical potential/current values correspond to corrosion behaviors at the anodic electrodes (20,40). During gas turbine operation, output signals are obtained from the sensing device (14,34) and indications are provided as to when certain maintenance operations should be performed on the gas turbine.