Temperature measurements are performed using coherent anti-Stokes Raman scattering. OH and CH and the pollutant species NO will be measured using laser-induced fluorescence. A combined theoretical and experimental approach is used for the development and evaluation of strategies for quantitative measurements in flames. DFWM signal levels and lineshapes are calculated theoretically by solving the time-dependent density matrix equations for the DFWM process by direct numerical integration. There are several possible advantages in co-firing natural gas and coal compared to combustion of coal alone including the potential to reduce emissions, increase carbon burnout, and reduce flame length.
Results show SO x reductions and decreased ignition delays with co-firing.
In a collaborative effort with General Electric Aircraft Engines, we will investigate experimental configurations that closely resemble actual GE gas turbine combustor configurations and operating conditions. Advanced nonintrusive laser diagnostics including CARS and LIF will be used to probe the mixing and combustion processes.