ELMEZOUAR, Abdel RafikABDALLAH BERRABEH, Ben aliCHOUAT, Nadjat2025-07-102025-07-102025http://dspace.univ-temouchent.edu.dz/handle/123456789/6537This thesis presents an experimental investigation into the factors influencing nitrogen oxide (NOx) emissions from Frame 6 gas turbines equipped with Dry Low NOx (DLN) systems within a natural gas liquefaction complex. These pollutants represent a major challenge for the energy industry, as their emissions can exceed regulatory limits even with advanced control technologies in place. The study combines a theoretical review of NOx formation mechanisms with a rigorous experimental campaign, utilizing in-situ gas analysis, fuel gas chromatography, and real-time operational data collection. The results demonstrate that fuel gas density and composition, particularly the levels of nitrogen and ethane, have a more decisive influence on NOx production than the fuel's overall calorific value. These findings underscore the need for a systemic, multi-parameter approach to emissions control and open pathways for developing advanced predictive models to optimize the environmental performance of industrial gas turbines.enThesis