20.500.12556/RUL-136573 Spatially selective dilution a novel approach for heat release control in continuous combustion To support the ongoing energy transition and minimize the environmental footprint of combustion related technologies, the paper presents a novel approach for combustion control in gas turbines and burners. It relies on spatially targeted injection of inert components in the spray core where existent concepts fail to deliver the desired dilution rate and are unable to fully govern the spatial distribution of heat release rates. Combustion process control is thus possible by actively adjusting the composition and mass flow of spatially selective introduction of inert species in the spray, optionally combined with classic, external exhaust gas recirculation, leading to an ultimate fuel-flexible concept which is capable of adjustments to heterogeneous fuels, their reactivity and physical properties. The proof of concept is demonstrated in a gas turbine combustion chamber first by investigating the isolated effects of spatially selective injection of inert species, its comparison to external exhaust gas recirculation and a combination of both. The results confirm the superiority of the approach as spatially selective mixture inertization is capable of 7% reduction of NO emissions with merely 3% increase of CO emissions and even 9% reduction of PM emissions. Furthermore, the concept proved transferrable together with all its benefits to combustion cycles with external exhaust gas recirculation. In this case, the 63% reduction of NO emissions with no observed CO penalty is possible. Simultaneous exploitation of spatially selective inertization, as well as external exhaust gas recirculation forms a fully controllable concept - spatially selective dilution control (SSDC), which enables extensive adjustability of dilution rates throughout the spray core and primary zone of combustion chamber. Compared to baseline case, such approach was proved to simultaneously reduce CO, NO and PM emissions normalized to fuel thermal power for 39%, 63% and 91%, respectively. The confirmation of applicability of the novel approach and its potential to influence the local conditions is opening a series of possible uses, either as an original design feature for future fuel-flexible systems or as a retrofit approach in existent combustion systems. exhaust gas recirculation mixture control spray atomization combustion heat release recirkulacija izpušnih plinov nadzor gorljive zmesi curek razprševanje zgorevanje sproščanje toplote true false true Angleški jezik Slovenski jezik Članek v reviji 2022-05-12 07:07:12 2022-05-12 07:07:24 2025-02-28 10:22:35 0000-00-00 00:00:00 2022 0 0 13 str. Vol. 316, art. 115068 Aug. 2022 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 536:662 1095-8630 10.1016/j.jenvman.2022.115068 107258115 Seljak_..._-_Spatially_selective_dilution.pdf Seljak_..._-_Spatially_selective_dilution.pdf 1 D4561B998AABD9D75D438C261A79DA45 b8971495cc3862bc53025270c6926fa89854c67454c08f7617ff01892762c5c4 5eca5acb-d1b2-11ec-8aca-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=156282 https://www.sciencedirect.com/science/article/pii/S0301479722006417 1 4d61a3dd-d1b1-11ec-8aca-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=156281 Fakulteta za strojništvo 0 0 0