The problem of greenhouse gases and pollutant emissions from combustion devices is moving the attention towards the development of new combustion technologies. In this context, oxy-fuel combustion, in which the fuel is fed with an oxygen-enriched gas mixture instead of air, represents a promising solution. Two of the most important advantages are represented by the reduction of nitrogen oxide (NOX) formation and the ability to capture CO2 from power plants and, more generally, to control the corresponding emissions. The reduction of N2 content during combustion makes easier the CO2 capture for its successive storage. In this work the numerical simulation of the semi-industrial FoSper furnace, fed with natural gas and a mixture of oxygen and recycled flue gases is presented and discussed. The combustion chemistry is described through a revised detailed kinetic mechanism and the Eddy Dissipation Concept (EDC) model is adopted for the description of chemistry-turbulence interactions. The role of the unavoidable air leakage and the drawbacks of global kinetic mechanisms are also discussed.
CFD simulation of the oxy-NG experiments in a 3 MW furnace
GALLETTI, CHIARA;TOGNOTTI, LEONARDO;
2012-01-01
Abstract
The problem of greenhouse gases and pollutant emissions from combustion devices is moving the attention towards the development of new combustion technologies. In this context, oxy-fuel combustion, in which the fuel is fed with an oxygen-enriched gas mixture instead of air, represents a promising solution. Two of the most important advantages are represented by the reduction of nitrogen oxide (NOX) formation and the ability to capture CO2 from power plants and, more generally, to control the corresponding emissions. The reduction of N2 content during combustion makes easier the CO2 capture for its successive storage. In this work the numerical simulation of the semi-industrial FoSper furnace, fed with natural gas and a mixture of oxygen and recycled flue gases is presented and discussed. The combustion chemistry is described through a revised detailed kinetic mechanism and the Eddy Dissipation Concept (EDC) model is adopted for the description of chemistry-turbulence interactions. The role of the unavoidable air leakage and the drawbacks of global kinetic mechanisms are also discussed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
