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High temperature corrosion in gas turbines : thermodynamic modelling and experimental results

Bettina Bordenet,L. Singheiser-2004-01-01
6

TL;DRAbstract

The introduction of new materials as well as the improvements in fuel quality have raised a need for re-evaluation of the hot corrosion risk in industrial gas turbines. In this study, the risk of hot corrosion was determined using thermodynamic modelling for different impurity-contents and combustion parameters. Based on these results, the parameters for the corrosion tests have been selected to investigate the response of the different materials under corrosive conditions. The corrosion risk arises if the surface temperature of a material is below the dew point of a corrosive salt and condensation can take place. The dew point of different salts has been calculated in the thermodynamic modelling, and the impurities S, Na, K and Cl were added in typical amounts for low-impurity fuels. This study has taken into account the variation of combustion parameters, such as excess air and injected water, as well as the C to H ratio of the fuel, to simulate gas and oil firing. The main influenci

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The introduction of new materials as well as the improvements in fuel quality have raised a need for re-evaluation of the hot corrosion risk in industrial gas turbines. In this study, the risk of hot corrosion was determined using thermodynamic modelling for different impurity-contents and combustion parameters. Based on these results, the parameters for the corrosion tests have been selected to investigate the response of the different materials under corrosive conditions. The corrosion risk arises if the surface temperature of a material is below the dew point of a corrosive salt and condensation can take place. The dew point of different salts has been calculated in the thermodynamic modelling, and the impurities S, Na, K and Cl were added in typical amounts for low-impurity fuels. This study has taken into account the variation of combustion parameters, such as excess air and injected water, as well as the C to H ratio of the fuel, to simulate gas and oil firing. The main influenci

Keywords

CorrosionGas turbinesHigh-temperature corrosionMaterials scienceThermodynamicsEnvironmental scienceMetallurgyEngineering

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