Spatially selective dilution

ǂa ǂnovel approach for heat release control in continuous combustion

Tine Seljak (Avtor), Urban Žvar Baškovič (Avtor), Žiga Rosec (Avtor), Tomaž Katrašnik (Avtor)

Povzetek

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.

Ključne besede

recirkulacija izpušnih plinov;nadzor gorljive zmesi;curek;razprševanje;zgorevanje;sproščanje toplote;exhaust gas recirculation;mixture control;spray;atomization;combustion;heat release;

Podatki

Jezik:	Angleški jezik
Leto izida:	2022
Tipologija:	1.01 - Izvirni znanstveni članek
Organizacija:	UL FS - Fakulteta za strojništvo
UDK:	536:662
COBISS:	107258115
ISSN:	1095-8630
Št. ogledov:	104
Št. prenosov:	44
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Slovenski jezik
Sekundarne ključne besede:	recirkulacija izpušnih plinov;nadzor gorljive zmesi;curek;razprševanje;zgorevanje;sproščanje toplote;
Vrsta dela (COBISS):	Članek v reviji
Strani:	str. 1-13
Zvezek:	ǂVol. ǂ316
Čas izdaje:	Aug. 2022
DOI:	10.1016/j.jenvman.2022.115068
ID:	15288104