In order to finalize the typical design process of new combustion systems, the last step to face with is usually the assessment of the correlation estimating the confidence of installing the prototype on a real engine on field. This scenario has been experienced during the validation of the new design of a premixed piloted burner to be installed on a F class engine V94.3A to reduce the NOx level below 15 ppm. The new Ansaldo Energia combustion system called VeLoNOx™ (Very Low NOx) has been designed not only to meet the challenge of the much more stringent emission requirements, but also to comply with the newer functional requirements typical of modern energy markets such as tighter grid frequency requirements. The real challenge of the design process has been investigating and validating a cross correlation between the findings of the high pressure combustion tests performed on a single burner test rig and the test campaign on a real engine with 24 burners housed in an annular combustor. Different parameters have been investigated and correlated such as combustion induced pressure oscillations, emissions, combustion efficiency and operating sensitivity. The paper describes the different steps performed in order to validate the correlation mentioned above in order to mitigate the possible risks and to estimate the confidence prior to introduce the prototype on a engine in commercial operation. Results achieved on laboratory and on field are shown and compared. Up to now Ansaldo Energia VeLoNOx™ combustion system has accumulated more than 15000 EOH on three sites with different climate conditions showing very good performances and fully meeting the design expectations. Orders for many retrofit applications have been awarded already.

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