NOx formation in post-flame gases from syngas/air combustion at atmospheric pressure
| Autor: | Bihter Padak, Sheikh F. Ahmed, Nazli Asgari, Tanvir Farouk |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Convection
Atmospheric pressure Renewable Energy Sustainability and the Environment Chemistry 020209 energy Energy Engineering and Power Technology Thermodynamics Laminar flow 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Combustion Fuel Technology Flux (metallurgy) Environmental chemistry 0202 electrical engineering electronic engineering information engineering Combustor 0210 nano-technology NOx Syngas |
| Zdroj: | International Journal of Hydrogen Energy. 42:24569-24579 |
| ISSN: | 0360-3199 |
| Popis: | Species concentration measurements specifically those associated with nitrogen oxides (NO x ) can act as important validation targets for developing kinetic models to predict NO x emissions under syngas combustion accurately. In the present study, premixed combustion of syngas/air mixtures, with equivalence ratio (Φ) from 0.5 to 1.0 and H 2 /CO ratio from 0.25 to 1.0 was conducted in a McKenna burner operating at atmospheric pressure. Temperature and NO x concentrations were measured in the post-combustion zone. For a given H 2 /CO ratio, increasing the equivalence ratio from lean to stoichiometric resulted in an increase in NO and decrease in NO 2 concentration near the flame. Increasing the H 2 /CO ratio led to a decrease in the temperature as well as the NO concentration near the flame. Based on the axial profiles above the burner, NO concentration increases right above the flame while NO 2 concentration decreases through NO 2 -NO conversion reactions according to the path flux analysis. In addition, the present experiments were operated in the laminar region where multidimensional transport effects play significant roles. In order to account for the radial and axial diffusive and convective coupling to chemical kinetics in laminar flow, a multidimensional model was developed to simulate the post-combustion species and temperature distribution. The measurements were compared against both multidimensional computational fluid dynamics (CFD) simulations and one-dimensional burner-stabilized flame simulations. The multidimensional model predictions resulted in a better agreement with the measurements, clearly highlighting the effect of multidimensional transport. |
| Databáze: | OpenAIRE |
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