467596 NOx Formation in Syngas/Air Combustion at Elevated Pressure

Monday, November 14, 2016: 4:15 PM
Franciscan D (Hilton San Francisco Union Square)
Nazli Asgari, University of South carolina, Columbia, SC, Sheikh F Ahmed, Department of Mechanical Engineering, University of South carolina, Columbia, SC, Tanvir I Farouk, Department of Mechanical Engineering, University of South Carolina, Columbia, SC and Bihter Padak, Chemical Engineering, University of South Carolina, Columbia, SC

Combustion of high hydrogen content (HHC) fuels is central to the implementation of integrated gasification combined cycle (IGCC) systems or to other configurations that would optimize power production while minimizing emissions. Gas turbines utilizing HHC fuels for power generation applications will be required to meet stringent pollutant emission standards, particularly with respect to nitrogen oxides (NOx). One of the effective NOx reduction technologies for gas turbines is lean premixed (LPM) combustion method. Accurate numerical prediction of NOx from such combustors using multi-dimensional models has only been of limited success. This is to some extent due to the complexity of NOx formation chemistry in LPM combustion. Experimental data is necessary for generating accurate computational models of NOx production in combustion. Improvement of the model predictions could be accomplished by validation against data from well-defined experiments to design a very low emission process with optimum efficiency. For gas turbine conditions, reliable high-pressure data is needed to both validate and improve reaction mechanisms to simulate NOx chemistry.

In this study, NOx formation in post-flame gases of syngas combustion was studied at elevated pressures. A high-pressure burner facility well suited to the study of reaction mechanisms was designed and fabricated. A series of experiments were performed to investigate the NOx formation from lean premixed syngas/air combustion with various stoichiometries (equivalence ratio between 0.5-1.0 and H2/CO ratio between 0.25-1.0). Acquiring an accurate temperature profile throughout the system is critical for making accurate predictions via kinetic simulations. Flame temperature and two-dimensional temperature distribution were measured under various conditions. Detailed NOx speciation measurements in the post-combustion zone were conducted by Fourier transform infrared spectrometer (FTIR). Additionally, computational fluid dynamics (CFD) simulations with detailed chemical kinetics were employed to predict the temperature and species profiles.

Extended Abstract: File Not Uploaded
See more of this Session: Combustion Kinetics and Emissions
See more of this Group/Topical: Catalysis and Reaction Engineering Division