Exhaust Thermoelements Redundant Strategy to Improve Temperature Reading Reliability and Serviceability

Pollution linked to power generation is strictly connected to gas turbine control algorithms and efficiency performance. Parts life is affected by quality and type of combustion too. The control of the exhaust temperature is therefore a key parameter to indirectly monitor the effectiveness of the combustion in all the combustion chamber of an heavy duty gas turbine. Actually due to the high temperature and dynamics of the combustion chambers the performance measurement of the combustion is achieved through indirect pressure and temperature monitoring. Moreover, exhaust temperature monitoring may allow to avoid dangerous situations connected to flame loose in combustion chamber and subsequent gas leak towards gas turbine high temperature zone. A reliable readout configuration of such sensors may improve the system overall safety too. In this paper the authors discuss about the best thermoelements configurations in order to improve the reliability and serviceability performance in gas turbine in order to increase the system efficiency during power generation.