SYSTEM AND METHOD FOR ONLINE MONITORING OF CORROSION OF GAS TURBINE COMPONENTS
First Claim
1. A method for online monitoring of corrosion of a component installed in a section of a gas turbine, the method comprising:
- locating a multi-electrode array sensing device on the gas turbine so that electrodes of the sensing device are exposed to an operating environment within the section of the gas turbine, the electrodes being formed of an electrode material and the component being formed of a component material that respond to at least one corrosive agent within the section of the gas turbine, the electrodes being electrically insulated from each other and each electrode being operable as an anodic electrode or a cathodic electrode depending on the extent of corrosion thereat so that each electrode has an electrical potential value, voltages exist across the electrodes, an electrical current flows from each anodic electrode to at least one of the cathodic electrodes, and the electrical potential values and the electric current values correspond to corrosion behaviors at the anodic electrodes;
operating the gas turbine and, while the gas turbine is operating, obtaining output signals from the sensing device based on at least one of the electrical potential values and the electric current values; and
indicating when a maintenance operation should be performed on the gas turbine by using the output signals of the sensing device to predict a corrosion characteristic of the component.
3 Assignments
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Accused Products
Abstract
A system and method capable of performing online corrosion monitoring of a component installed in a gas turbine. A sensing device is located so that electrodes thereof are exposed to an operating environment within the gas turbine section containing the component. The electrodes are formed of a material so that the component and electrodes similarly respond to corrosive agents within the gas turbine section. The electrodes are electrically insulated from each other and each electrode is operable as an anodic electrode or a cathodic electrode, depending on the extent of corrosion thereat, so that each electrode has an electrical potential value, voltages exist across the electrodes, electric currents flow between the electrodes, and the electrical potential/current values correspond to corrosion behaviors at the anodic electrodes. During gas turbine operation, output signals are obtained from the sensing device and indications are provided as to when certain maintenance operations should be performed on the gas turbine.
21 Citations
20 Claims
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1. A method for online monitoring of corrosion of a component installed in a section of a gas turbine, the method comprising:
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locating a multi-electrode array sensing device on the gas turbine so that electrodes of the sensing device are exposed to an operating environment within the section of the gas turbine, the electrodes being formed of an electrode material and the component being formed of a component material that respond to at least one corrosive agent within the section of the gas turbine, the electrodes being electrically insulated from each other and each electrode being operable as an anodic electrode or a cathodic electrode depending on the extent of corrosion thereat so that each electrode has an electrical potential value, voltages exist across the electrodes, an electrical current flows from each anodic electrode to at least one of the cathodic electrodes, and the electrical potential values and the electric current values correspond to corrosion behaviors at the anodic electrodes; operating the gas turbine and, while the gas turbine is operating, obtaining output signals from the sensing device based on at least one of the electrical potential values and the electric current values; and indicating when a maintenance operation should be performed on the gas turbine by using the output signals of the sensing device to predict a corrosion characteristic of the component. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for online monitoring of corrosion of a compressor blade installed in a compressor section of a gas turbine, the method comprising:
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locating a multi-electrode array sensing device in the compressor section so that electrodes of the sensing device are exposed to an operating environment within the compressor section of the gas turbine, the electrodes being formed of an electrode material and the blade being formed of a blade material so that the blade and the electrodes similarly respond to corrosive agents within the compressor section of the gas turbine, the electrodes being electrically insulated from each other and each electrode being operable as an anodic electrode or a cathodic electrode depending on the extent of corrosion thereat so that each electrode has an electrical potential value, voltages exist across the electrodes, an electrical current flows from each anodic electrode to at least one of the cathodic electrodes, and the electrical potential values and the electric current values correspond to corrosion behaviors at the anodic electrodes; operating the gas turbine and, while the gas turbine is operating, obtaining output signals from the sensing device based on at least one of the electrical potential values and the electric current values; indicating when a maintenance operation should be performed on the gas turbine by using the output signals of the sensing device to predict a corrosion characteristic of the blade; and performing the maintenance operation, wherein the corrosion characteristic is at least one of pitting depth and pitting rate of the blade.
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15. A system adapted to perform online monitoring of corrosion of a component installed in a section of a gas turbine, the system comprising:
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a multi-electrode array sensing device located on the gas turbine so that electrodes of the sensing device are exposed to an operating environment within the section of the gas turbine, the electrodes being formed of an electrode material and the component being formed of a component material that respond to corrosive agents within the section of the gas turbine, the electrodes being electrically insulated from each other and each electrode being operable as an anodic electrode or a cathodic electrode depending on the extent of corrosion thereat so that each electrode has an electrical potential value, voltages exist across the electrodes, an electrical current flows from each anodic electrode to at least one of the cathodic electrodes, and the electrical potential values and the electric current values correspond to corrosion behaviors at the anodic electrodes; means for obtaining output signals from the sensing device based on at least one of the electrical potential values and the electric current values; and means for indicating when a maintenance operation should be performed on the gas turbine by using the output signals of the sensing device to predict a corrosion characteristic of the component. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification